www.chemengonline.com April 2019 Cover Story 34 Part 1 Protecting Instruments from Overpressure Overpressure in a process can damage the seals in a pressure instrument's sensor or skew the zero point. Here's how to avoid the problem 38 Part 2 Prevent Product Release with Pressure Protection Systems Closing off pressure upstream can minimize the need for pressure-relief systems to open, avoiding product waste and possible environmental damage In the News 7 Chementator This P-recovery process is market-ready; A new membrane for forward osmosis; Zeolite membranes to undergo large-scale testing for CO2 capture; Nanostructured catalyst converts CO2 to ethanol electrochemically; First applications announced for a supramolecular chemistry technology; and more 12 Business News Asahi Kasei plans LIB separator capacity expansions; ExxonMobil moves forward with construction of Baton Rouge PP plant; Outotec to construct sulfuric acid plant in Morocco; Ineos to build new vinyl acetate monomer plant in the U.K.; Evonik to sell its methacrylates business for €3 billion; and more 14 Newsfront A Bright Future for Quantum Dots The novel performance characteristics and tunability of quantum dots make them a promising nanomaterial in numerous emerging applications 18 Newsfront Distillation: It's What's on the Inside that Counts New column internals boost efficiency and improve the reliability of distillation towers Technical and Practical 32 Facts at your Fingertips Industrial Drying: Convection versus Conduction This one-page reference provides information on the differences between conduction and convective drying approaches 33 Technology Profile Production of Polyacrylonitrile This column outlines the production of polyacrylonitrile fibers from methyl acrylate monomer and other additives 42 Feature Report Field Performance Testing for Centrifugal Compressors Determining the field performance of centrifugal compressors can benefit operation and maintenance of the equipment. Presented here is an overview of the parameters that must be measured and calculated for effective testing 14 38 34 Volume 126 | no. 4 42 CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM APRIL 2019 1http://www.chemengonline.com http://WWW.CHEMENGONLINE.COM