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This post was last edited by 955559 on 2017-7-31 at 16:23. [Daily Question No. 044] 2017.02.13: In hydrogenation feed oil, （ ） is prone to polymerization reactions; the polymers resulting from these reactions can cause coking on the surface of the catalysts in the upper part of the bed, leading to a rapid increase in the pressure drop across the catalyst bed in the reactor and thus shortening the operational cycle of the plant. A. Thiol B. Olefin C. Thioether D. Thiophene Refer to the answer key after reviewing; points will be awarded for identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Petrochemical Area – “Creative Ideas for Energy Saving” event: http://bbs.hcbbs.com/thread-1666758-1-1.html The New Normal Cup – Voting for the top 10 members of HaiChuan in 2016 is now underway; vote for the member you like the most (please cast your valuable vote for the members in the Petrochemical Area). http://bbs.hcbbs.com/thread-1667649-1-1.html Summary thread of Q&A questions for 2017 (updates available now). http://bbs.hcbbs.com/thread-1657793-1-1.html Summary thread of daily questions for 2017 (updates available now). http://bbs.hcbbs.com/thread-1657794-1-1.html Summary thread of Q&A questions from 2016 (all updates completed). http://bbs.hcbbs.com/thread-1597792-1-1.html Third round of selection for outstanding management members of HaiChuan. http://bbs.hcbbs.com/thread-1655902-1-1.html Petrochemical Area – “Creative Ideas for Energy Saving” event: http://bbs.hcbbs.com/thread-1666758-1-1.html Xiaomi phones are up for grabs. Thread for collecting chemical industry technical materials in the “Petrochemical Section”. http://bbs.hcbbs.com/thread-1654603-1-1.html Many prizes are waiting for you (Source: HaiChuan Chemical Forum)