Chemical Processing - April 2008 - (Page 13) ALSO IN THIS SECTION: 15 Adsorbent breaks CO2 barrier IN PROCESS < > Hybrid membrane Figure 1. Layer deposited on alumina support is about 100-nm thick (inset shows close-up of organic and inorganic bonds and pores); only water molecules pass through sieve. Source: ECN. >> Economic Snapshot 80.0 79.0 78.0 77.0 76.0 75.0 74.0 73.0 72.0 Feb 07 Mar 07 Apr 07 May 07 June 07 July07 Aug07 Sept 07 Oct 07 Nov 07 Dec 07 Jan 08 55,000 54,500 54,000 53,500 $ Million 53,000 52,500 52,000 51,500 51,000 49,500 Shipments (NAICS S325) Capacity utilization 71.0 Shipments continued to rise while capacity utilization remained steady. Source: American Chemistry Council. www.chemicalprocessing.com ence of water can degrade at temperatures as low as 60°c. replacing siloxane bonds with hydrolytically stable si–cxhy-si links enables the membrane to handle separations at temperatures up to at least 150°c, explain the researchers. use of polymer materials such as polyvinyl alcohol is limited to around 85°c, they add. the membrane, which typically has pores in the 2–4 Å range and a narrow pore-size distribution, is deposited as an about-100-nm layer on a tubular mesoporous alumina support (Figure 1). it’s possible to adjust the pore-size distribution to suit particular potential applications; that’s an area where the university of twente is heading efforts, says Vente. During 18 months of continuous testing, the water content of permeate from the pervaporation of a 95-wt% n-butanol/5wt% water mixture at 150°c remained at 98-wt%. the lack of a substantial performance decline over the period, coupled with the selectivity, which is high enough for commercial applications, point up potential of the membrane for large-scale industrial use, say the researchers. “these tests were performed on a number of membranes, each with a surface area of about 40 cm2, i.e., one tube of 10 cm length,” says Vente. “currently, we have April 2008 • 13 % http://www.chemicalprocessing.com
Table of Contents Feed for the Digital Edition of Chemical Processing - April 2008 Chemical Processing - April 2008 Contents From the Editor ChemicalProcessing.com Field Notes In Process Energy Saver Compliance Advisor Is It a Tragedy or Comedy for Engineers? Better Understanding Boosts Mixer Scale-up Don't Err With Air Compressors Control Performance Supervision Enhances Revamp Process Puzzler Plant InSites Equipment & Services Product Spotlight/Classifieds Ad Index End Point Chemical Processing - April 2008 Chemical Processing - April 2008 - Chemical Processing - April 2008 (Page Cover1) Chemical Processing - April 2008 - Chemical Processing - April 2008 (Page Cover2) Chemical Processing - April 2008 - Chemical Processing - April 2008 (Page 3) Chemical Processing - April 2008 - Chemical Processing - April 2008 (Page 4) Chemical Processing - April 2008 - Contents (Page 5) Chemical Processing - April 2008 - Contents (Page 6) Chemical Processing - April 2008 - From the Editor (Page 7) Chemical Processing - April 2008 - From the Editor (Page 8) Chemical Processing - April 2008 - ChemicalProcessing.com (Page 9) Chemical Processing - April 2008 - ChemicalProcessing.com (Page 10) Chemical Processing - April 2008 - Field Notes (Page 11) Chemical Processing - April 2008 - Field Notes (Page 12) Chemical Processing - April 2008 - In Process (Page 13) Chemical Processing - April 2008 - In Process (Page 14) Chemical Processing - April 2008 - In Process (Page 15) Chemical Processing - April 2008 - In Process (Page 16) Chemical Processing - April 2008 - Energy Saver (Page 17) Chemical Processing - April 2008 - Energy Saver (Page 18) Chemical Processing - April 2008 - Compliance Advisor (Page 19) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 20) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 21) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 22) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 23) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 24) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 25) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 26) Chemical Processing - April 2008 - Is It a Tragedy or Comedy for Engineers? (Page 27) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 28) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 29) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 30) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 31) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 32) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 33) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 34) Chemical Processing - April 2008 - Better Understanding Boosts Mixer Scale-up (Page 35) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 36) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 37) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 38) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 39) Chemical Processing - April 2008 - Don't Err With Air Compressors (Page 40) Chemical Processing - April 2008 - Control Performance Supervision Enhances Revamp (Page 41) Chemical Processing - April 2008 - Control Performance Supervision Enhances Revamp (Page 42) Chemical Processing - April 2008 - Control Performance Supervision Enhances Revamp (Page 43) Chemical Processing - April 2008 - Control Performance Supervision Enhances Revamp (Page 44) Chemical Processing - April 2008 - Process Puzzler (Page 45) Chemical Processing - April 2008 - Process Puzzler (Page 46) Chemical Processing - April 2008 - Process Puzzler (Page 47) Chemical Processing - April 2008 - Plant InSites (Page 48) Chemical Processing - April 2008 - Equipment & Services (Page 49) Chemical Processing - April 2008 - Equipment & Services (Page 50) Chemical Processing - April 2008 - Equipment & Services (Page 51) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 52) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 53) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 54) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 55) Chemical Processing - April 2008 - Product Spotlight/Classifieds (Page 56) Chemical Processing - April 2008 - Ad Index (Page 57) Chemical Processing - April 2008 - End Point (Page 58) Chemical Processing - April 2008 - End Point (Page Cover3) Chemical Processing - April 2008 - End Point (Page Cover4)
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