Hydrocarbon Processing - February 2022 - 31
Digital Technologies
The ability to predict crude oil compatibility
can significantly improve refining
margins, especially for refiners that work
with large crude mix parcels. For cases
where 4-10 crudes are likely to be blended,
predicting compatibility will be a necessity
and not a luxury. The prediction
software also guides refiners for optimal
fuel oil blending and crude blending for
bitumen production. Most importantly,
this will assist refiners to process crude
mix parcels with a greater number of constituents
to increase profitability.
Refiners can use the software to improve
equipment life, ensure smooth operations,
increase energy savings and lessen
environmental impact. This software
has the capability to significantly contribute
to the world if refineries adhere to
minimizing asphaltene precipitation.
NOTE
a
BPCL's K Model
ACKNOWLEDGMENTS
The authors would like to express their sincere
thanks to BPCL management for its constant support
in model validation and commercialization. In addition,
the authors would like to thank CRDC and refinery
colleagues (Dr. Rajkumar, Ms. Sonal, Mr. Ankur, Md.
Muzaffar, Mr. Prasad and Mr. Sathiyanarayanan), along
with colleagues from the Indian Institute of Technology
(IIT) Delhi (Professor Sreedevi Upadhyayula, Dr.
Tanmoy Patra and Dr. Shashank Bahri) for research
support.
LITERATURE CITED
1
Kumar, R., P. Parihar and R. K. Voolapalli, " Improve
feedstock selection for your refinery, " Hydrocarbon
Processing, June 2012.
2
Centeno, G., G. Sánchez-Reyna, J. Ancheyta, J. A.
D. Muñoz and N. Cardona, " Testing various mixing
rules for calculation of viscosity of petroleum
blends, " Fuel, December 2011.
3
Rana, M. S., V. Sámano, J. Ancheyta and J. A. I.
Diaz, " A Review of Recent Advances on Process
Technologies for Upgrading of Heavy Oils and
Residua, " Fuel, June 2007.
4
Parihar, P., R. Kumar, R. K. Voolapalli and S.
Agrawal, " Optimization of hydrogen management
for distillate production, " Hydrocarbon Processing,
March 2012.
5
Asomaning, S. and A. P. Watkinson, " Petroleum
stability and heteroatom species effect in fouling
of heat exchanger by asphaltenes, " Heat Transfer
Engineering, July 2000.
6
Rodriguez, S., J. Ancheyta, R. Guzman and F. Trejo,
" Experimental setups for studying the compatibility
of crude oil blends under dynamic conditions, "
Energy Fuels, September 2016.
7 Mahmoud, M. B. and A. A. Aboujadeed,
" Compatibility assessment of crude oil blend
using different methods, " Chemical Engineering
Transactions, 2017.
8
Saleh, Z. S., R. Sheikholeslami and A. P. Watkinson,
" Blending effects on fouling of four crude oils, " ECI
Symposium Series, Proceedings of 6th International
Conference on Heat Exchanger Fouling and
25
16
Cleaning-Challenges and Opportunities, 2005.
9
Schermer, W. E. M., P. M. J. Melein and F. G.
A. Vanderberg, " Simple techniques for evaluation
of crude oil compatibility, " Petroleum Science and
Technology, January 2004.
10
Wiehe, I. A. and R. J. Kennedy, " The oil compatibility
model and crude oil incompatibility, " Energy
Fuels, 2000.
11
Rathore, V., R. Brahma, T. Thorat, P.V. C. Rao and
N. V. Choudary, " Assessment of crude oil blends, "
Digital Refining, October 2011, online: https://
www.digitalrefining.com/article/1000381/assessment-of-crude-oil-blends#.YbKFcr3MJPY
12
Sepúlveda,
J. A., J. P. Bonilla and Y. Medina,
" Prediction of the stability of asphaltenes using the
SARA analysis for pure oils, " Ingeniería y Región,
December 2010.
13
ASTM D4740-04 (2014), " Standard Test Method
for Cleanliness and Compatibility of Residual
Fuels by Spot Test, " ASTM International, West
Conshohocken, Pennsylvania, June 2019.
14
Stratiev, D., I. Shishkova, A. Nedelchev, K. Kirilov,
E. Nikolaychuk and A. Ivanov, " Investigation of relationships
between petroleum properties and their
impact on crude oil compatibility, " Energy Fuels,
November 2015.
15
Stratiev, D., I. Shiskova, T. Tsaneva, M. Mitkova and
D. Yordanov, " Investigation of relations between
properties of vacuum residual oils from different
origin, and of their deasphalted and asphaltene fractions, "
Fuel, April 2016.
Mendoza de la Cruz, J. L., J. C. Cedillo-Ramírez, A.
D. J. Aguirre-Gutiérrez, F. García-Sánchez and M.
A. Aquino-Olivos, " Incompatibility determination
of crude oil blend from experimental viscosity and
density data, " Energy & Fuels, January 2015.
17
ASTM D7112-12 (2017), " Standard Test Method
for Determining
Stability
and Compatibility
of Heavy Fuel Oils and Crude Oils by Heavy
Fuel Oil Stability Analyzer (Optical Detection), "
ASTM International, West Conshohocken,
Pennsylvania, 2017.
18
Nemana, S., M. Kimbrell and E. Zaluzec, " Predictive
crude oil compatibility model, " U.S. Patent
20040121472A1, 2004.
19
Kumar, R., M. M. Ahsan, P. Parihar and R. K.
Voolapalli, " Prediction of refining characteristics of
oil, " U.S. Patent 9846147, December 2017.
20
Hong, E. and A. P. Watkinson, " Precipitation and
fouling in heavy oil-diluent blends, " Heat Transfer
Engineering, September 2009.
21
Sharma, B. K., C. D. Sharma, S. D. Bhagat and S. Z.
Erhan, " Maltenes and asphaltenes of petroleum vacuum
residues: Physico-chemical characterization, "
Petroleum Science and Technology, January 2007.
22 Fernando, T., M. S. Rana and A. Ancheyta,
" Thermogravimetric determination of coke from
asphaltenes, resins and sediments and coking kinetics
of heavy crude asphaltenes, " Catalysis Today,
March, 2010.
23
Nazar, R. S. and L. Bayandory, " Investigation of
asphaltene stability in the Iranian crude oils, " Iranian
Journal of Chemical Engineering, January 2008.
24
Kumar, R., S. Maheshwari, R. K. Voolapalli, T. S.
Thorat and S. Bhargava, " Prediction of kinematic
viscosity of vacuum residue and refinery product
blends, " U.S. Patent 15/272,237, September 2016.
Kumar, R., C. Viswanath, S. Bhargava, R. K.
Voolapalli, S. Tyagi, S. R. Kulkarni, H. B. Banoth
and P. Gulati, " Estimation of cold-flow properties
of
refinery product blends, " U.S. Patent
20160195506A1, January 2016.
26
Liu, G., X. Xu and J. Gao, " Study on the Compatibility
of Asphaltic Crude Oil with the Electric Desalting
27
Demulsifiers, " Energy Fuels, April 2003.
Kumar, R., T. S. Thorat, C. Viswanath, V. Rathore,
P. V. C. Rao and N. V. Choudary, " Processing
Opportunity Crude Oils-Catalytic Process
for High-Acid Crudes, " Hydrocarbon World,
November 2009.
RAJEEV KUMAR is the Chief
Manager of Research and
Development (R&D) at BPCL's
R&D Center in India. His research
interests include developing new
products/processes, modeling
refinery processes and alternative
fuels. He has published more than 25 research
articles and has filed 20 patent applications in both
India and internationally. He earned a BTech degree
in chemical engineering from the Birsa Institute of
Technology Sindri (BIT Sindri), along with an MTech
degree in chemical engineering from the Indian
Institute of Technology (IIT) Kanpur, and a PhD in
chemical engineering from IIT Delhi.
PRANAB KUMAR RAKSHIT is the
Chief Manager (R&D) at BPCL's
R&D Center in Noida, Uttar
Pradesh, India. His research
interests include developing new
processes, reactor scale-ups and
alternative fuels. Dr. Rakshit has
published more than 15 research articles and papers
in technical journals and magazines. He has filed
10 patent applications in India and internationally.
He earned a BTech degree in chemical engineering
from the National Institute of Technology (NIT)
Surathkal; an M.E. degree in chemical engineering
from the Indian Institute of Science, Bangalore;
and a PhD in chemical engineering from IIT Delhi.
MATHEW JOHN is the Senior
Manager (R&D) at BPCL's R&D
Center in India. He has 15 yr of
research experience specializing
in advanced computational
research, multi-scale modeling
and catalyst/adsorbent
development. Dr. John has an h-index of 14. He has
published more than 19 papers in international
peer-reviewed journals, and also has 15 national
and international conference papers to his credit.
He earned a Bch degree in chemical engineering
from the University of Mumbai, an M.E. degree in
chemical engineering from the Indian Institute of
Science, and a PhD in chemical engineering from
Ghent University, Belgium.
RAVI KUMAR VOOLAPALLI is the
Chief General Manager at BPCL's
R&D Center in India. He has more
than 30 yr of research experience.
Dr. Voolapalli has published
more than 50 papers in reputed
international journals and
conferences, and has contributed to several patents
and applications. He authored a chapter on " Fluid
Catalytic Cracking " in the Handbook of Petroleum
and Natural Gas Refining and Processing, ASTM
manual series (2013). His areas of research interest
are refinery and petrochemical processes, coal/gasto-liquid
technologies, syngas-to-methanol/DME,
modeling, simulation, scale-up and optimization.
He earned a BTech degree in chemical engineering
from Andhra University, Visakhapatnam; an MTech
degree in chemical engineering from IIT Kanpur;
and a PhD from the Imperial College of London.
Hydrocarbon Processing | FEBRUARY 2022 31
https://www.digitalrefining.com/article/1000381/assessment-of-crude-oil-blends#.YgG4jN_MKUl
https://www.digitalrefining.com/article/1000381/assessment-of-crude-oil-blends#.YgG4jN_MKUl
https://www.digitalrefining.com/article/1000381/assessment-of-crude-oil-blends#.YgG4jN_MKUl
Hydrocarbon Processing - February 2022
Table of Contents for the Digital Edition of Hydrocarbon Processing - February 2022
Contents
Hydrocarbon Processing - February 2022 - Cover1
Hydrocarbon Processing - February 2022 - Cover2
Hydrocarbon Processing - February 2022 - Contents
Hydrocarbon Processing - February 2022 - 4
Hydrocarbon Processing - February 2022 - 5
Hydrocarbon Processing - February 2022 - 6
Hydrocarbon Processing - February 2022 - 7
Hydrocarbon Processing - February 2022 - 8
Hydrocarbon Processing - February 2022 - 9
Hydrocarbon Processing - February 2022 - 10
Hydrocarbon Processing - February 2022 - 11
Hydrocarbon Processing - February 2022 - 12
Hydrocarbon Processing - February 2022 - 13
Hydrocarbon Processing - February 2022 - 14
Hydrocarbon Processing - February 2022 - 15
Hydrocarbon Processing - February 2022 - 16
Hydrocarbon Processing - February 2022 - 17
Hydrocarbon Processing - February 2022 - 18
Hydrocarbon Processing - February 2022 - 19
Hydrocarbon Processing - February 2022 - 20
Hydrocarbon Processing - February 2022 - 21
Hydrocarbon Processing - February 2022 - 22
Hydrocarbon Processing - February 2022 - 23
Hydrocarbon Processing - February 2022 - 24
Hydrocarbon Processing - February 2022 - 25
Hydrocarbon Processing - February 2022 - 26
Hydrocarbon Processing - February 2022 - 27
Hydrocarbon Processing - February 2022 - 28
Hydrocarbon Processing - February 2022 - 29
Hydrocarbon Processing - February 2022 - 30
Hydrocarbon Processing - February 2022 - 31
Hydrocarbon Processing - February 2022 - 32
Hydrocarbon Processing - February 2022 - 33
Hydrocarbon Processing - February 2022 - 34
Hydrocarbon Processing - February 2022 - 35
Hydrocarbon Processing - February 2022 - 36
Hydrocarbon Processing - February 2022 - 37
Hydrocarbon Processing - February 2022 - 38
Hydrocarbon Processing - February 2022 - 39
Hydrocarbon Processing - February 2022 - 40
Hydrocarbon Processing - February 2022 - 41
Hydrocarbon Processing - February 2022 - 42
Hydrocarbon Processing - February 2022 - 43
Hydrocarbon Processing - February 2022 - 44
Hydrocarbon Processing - February 2022 - 45
Hydrocarbon Processing - February 2022 - 46
Hydrocarbon Processing - February 2022 - 47
Hydrocarbon Processing - February 2022 - 48
Hydrocarbon Processing - February 2022 - 49
Hydrocarbon Processing - February 2022 - 50
Hydrocarbon Processing - February 2022 - 51
Hydrocarbon Processing - February 2022 - 52
Hydrocarbon Processing - February 2022 - 53
Hydrocarbon Processing - February 2022 - 54
Hydrocarbon Processing - February 2022 - 55
Hydrocarbon Processing - February 2022 - 56
Hydrocarbon Processing - February 2022 - 57
Hydrocarbon Processing - February 2022 - 58
Hydrocarbon Processing - February 2022 - 59
Hydrocarbon Processing - February 2022 - 60
Hydrocarbon Processing - February 2022 - 61
Hydrocarbon Processing - February 2022 - 62
Hydrocarbon Processing - February 2022 - 63
Hydrocarbon Processing - February 2022 - 64
Hydrocarbon Processing - February 2022 - 65
Hydrocarbon Processing - February 2022 - 66
Hydrocarbon Processing - February 2022 - 67
Hydrocarbon Processing - February 2022 - 68
Hydrocarbon Processing - February 2022 - 69
Hydrocarbon Processing - February 2022 - 70
Hydrocarbon Processing - February 2022 - 71
Hydrocarbon Processing - February 2022 - 72
Hydrocarbon Processing - February 2022 - 73
Hydrocarbon Processing - February 2022 - 74
Hydrocarbon Processing - February 2022 - 75
Hydrocarbon Processing - February 2022 - 76
Hydrocarbon Processing - February 2022 - 77
Hydrocarbon Processing - February 2022 - 78
Hydrocarbon Processing - February 2022 - 79
Hydrocarbon Processing - February 2022 - 80
Hydrocarbon Processing - February 2022 - 81
Hydrocarbon Processing - February 2022 - 82
Hydrocarbon Processing - February 2022 - Cover3
Hydrocarbon Processing - February 2022 - Cover4
Hydrocarbon Processing - February 2022 - GP-1
Hydrocarbon Processing - February 2022 - GP-2
Hydrocarbon Processing - February 2022 - GP-3
Hydrocarbon Processing - February 2022 - GP-4
Hydrocarbon Processing - February 2022 - GP-5
Hydrocarbon Processing - February 2022 - GP-6
Hydrocarbon Processing - February 2022 - GP-7
Hydrocarbon Processing - February 2022 - GP-8
Hydrocarbon Processing - February 2022 - GP-9
Hydrocarbon Processing - February 2022 - GP-10
Hydrocarbon Processing - February 2022 - GP-11
Hydrocarbon Processing - February 2022 - GP-12
Hydrocarbon Processing - February 2022 - GP-13
Hydrocarbon Processing - February 2022 - GP-14
Hydrocarbon Processing - February 2022 - GP-15
Hydrocarbon Processing - February 2022 - GP-16
Hydrocarbon Processing - February 2022 - GP-17
Hydrocarbon Processing - February 2022 - GP-18
Hydrocarbon Processing - February 2022 - GP-19
Hydrocarbon Processing - February 2022 - GP-20
Hydrocarbon Processing - February 2022 - GP-21
Hydrocarbon Processing - February 2022 - GP-22
Hydrocarbon Processing - February 2022 - GP-23
Hydrocarbon Processing - February 2022 - GP-24
Hydrocarbon Processing - February 2022 - GP-25
Hydrocarbon Processing - February 2022 - GP-26
Hydrocarbon Processing - February 2022 - GP-27
Hydrocarbon Processing - February 2022 - GP-28
Hydrocarbon Processing - February 2022 - GP-29
Hydrocarbon Processing - February 2022 - GP-30
Hydrocarbon Processing - February 2022 - GP-31
Hydrocarbon Processing - February 2022 - GP-32
Hydrocarbon Processing - February 2022 - GP-33
Hydrocarbon Processing - February 2022 - GP-34
Hydrocarbon Processing - February 2022 - GP-35
Hydrocarbon Processing - February 2022 - GP-36
https://www.nxtbook.com/gulfenergyinfo/gulfpub/HPI-Market-Data-2023-v3
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2024-v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2024
https://www.nxtbook.com/gulfenergyinfo/gulfpub/gas-processes-handbook-2022_v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/gas-processes-handbook-2022
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hp_202212
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2023-v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2023
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hp_202211
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202210
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202209
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202208
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202207_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202207
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202206_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202206
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202205_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202205
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202204_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202204
https://www.nxtbook.com/nxtbooks/gulfpub/hp_032022
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202203
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202202
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202201
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202112
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202111
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202110
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2022_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2022
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202109
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202108
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_processes_handbook_2021_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_processes_handbook_2021
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202107
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202106
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202105
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202104
https://www.nxtbook.com/nxtbooks/gulfpub/hp_ebooks
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202103
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202102
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202101
https://www.nxtbook.com/nxtbooks/gulfpub/catalyst_handbook_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/catalyst_handbook_2020
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202011
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202010
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2021
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202009
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202008
https://www.nxtbook.com/nxtbooks/gulfpub/refining_processes_handbook_2020
https://www.nxtbook.com/nxtbooks/gulfpub/refining_processes_handbook_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202007
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202006
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202005
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202004
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202003
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202002
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202001
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201912
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201911
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2020
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201910
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201909
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201908
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201907
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201906
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201905
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201904
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201903
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201902
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201901
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201812
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201811
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201810
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201809
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201808
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201807
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201806
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201805
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201804
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201803
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201802
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201801
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201712
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201711
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201710
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201709
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201708
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201707
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201706
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201705
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201704
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201703
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201702
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201701
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2017mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201612
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201611
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201610
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201609
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201608
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201607
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201606
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201605
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201604
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201603
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201602
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201601
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201512
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201511
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201510
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2016mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201509
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201508
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201507
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2015tmsd
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201506
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201505
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201504
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201503
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201502
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201501
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201412
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201411
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2015mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201410
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201409
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201408
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201407
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014petrochemicalprocesses_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014petrochemicalprocesses
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201406
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201405
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201404
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201403
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014calendar
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201402
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201401
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201312
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201311
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201310
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201309
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201308
https://www.nxtbook.com/nxtbooks/gulfpub/hp_srsguide2013
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201307
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201306
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201305
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201304
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201303
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201302
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201301
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201212
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201211
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201210
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201209
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201208
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201207
https://www.nxtbook.com/nxtbooks/gulfpub/hp_srsguide2012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201206
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201205
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201204
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201203
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201202
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201201
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201112
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201111
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201110
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201109
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201108
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201107_srsguide
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201107
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201106
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201105
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201104
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201103
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201102
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201101
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201011
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201010
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201009
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201008
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201007
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201006
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201005
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201004
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201003
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201002
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201001
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200912
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200911
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200910
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200909
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200908
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200907
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200906
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200905
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200904
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200903
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200902
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200901
https://www.nxtbookmedia.com