www.chemengonline.com February 2018 Cover Story 30 Part 1 Distillation: Experimental Validation of Column Simulations A practical look at the need for validation, as well as conceptual considerations and a case study 38 Part 2 Distillation: Bubble-Cap Tray Vapor Turndown The concept of tray stability can apply to bubble caps and can be used as an alternative method to determine the minimum efficient capacity of these devices. A new stability correlation for bubble-cap trays is proposed and checked against FRI data In the News 5 Chementator New process converts refinery offgas into gasoline; Lowercost sulfur-removal process for syngas goes commercial; Biomass fractionation and conversion technology to be scaled up; Progress toward an aluminum-graphene battery; Recycled materials improve the nylon product chain; and more 10 Business News Asahi Kasei to increase global production capacity for LIB separators; Chevron Phillips' Cedar Bayou ethane cracker reaches mechanical completion; Enterprise Products to expand butane isomerization capacity; AkzoNobel plans to increase production of high-purity salt at Delfzijl site; and more 12 Newsfront Placing Analytics in the Hands of Engineers The field of data analytics is evolving quickly, and an increasing number of offerings are being designed with chemical engineers in mind 16 Newsfront Improving the Daily Grind New milling, grinding and size-reduction equipment helps processors obtain better efficiencies and develop new products Technical and Practical 26 Facts at your Fingertips Flow Measurement in Large Lines, Ducts and Stacks This one-page reference provides information about measuring the flow of gases in large ducts and stacks, with a focus on measuring flow for air-pollution control 28 Technology Profile Cyclohexane Production from Benzene and Hydrogen This process description outlines the production of cyclohexane starting with benzene and hydrogen 42 Feature Report Single-Use Gloves: Problems and Solutions When wearing single-use protective gloves, sweat can create health and safety issues. Presented here is a look at the causes of the problems and possible solutions 46 Engineering Practice Improvements in DP Level Measurement Differential-pressure (DP) level measurements are widely used in chemical and petrochemical facilities, thanks to their reliability and ease of use. Recent advances are making them even more reliable and easy to use CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM FEBRUARY 2018 1 16 12 30 Volume 125 | no. 2 42http://www.chemengonline.com http://WWW.CHEMENGONLINE.COM