www.che.com MAY 2013 VOLUME 120, NO. 5 COVER STORY 17 Cover Story Petroleum Refining Outlook Petroleum from shale and oil sands offers opportunities for North American refiners, but the shifting crude diet also presents challenges NEWS 11 Chementator A waste-free monomer recovery process is licensed; Gas-phase option for NOx abatement; A step closer to commercialization for a new " green " solvent; Bioengineers make an " ideal " hydrogel for antimicrobial applications; Detecting bioparticles; Dandelion rubber; Biodegradable anti-scalant; and more 22 Newsfront Combustible Dust Safety While understanding combustible dust regulations can be difficult, experts stress the importance of compliance ENGINEERING 32a Facts at Your Fingertips Control Valve Performance This reference summarizes important aspects of control valve performance, including parameters for both static and dynamic responses 33 Technology Profile Gas-Phase Polypropylene Production This one-page profile describes the technology and some economic considerations for the titled process 34 Feature Report Inline Viscosity Measurements Process viscometers can help keep process control and product quality in check 39 Feature Report Correcting Improper Performance of Direct-Fired Heaters A practical, step-by-step approach for finding the root cause and troubleshooting burner problems 47 Engineering Practice Specifying Shell-and-Tube Heat Exchangers Understand what heat-exchanger design specialists need to know - and remember, you know your process best 39 CHEMICAL ENGINEERING WWW.CHE.COM MAY 2013 1 34 22 17http://www.che.com http://WWW.CHE.COM