【Daily Question】 2016 07 08 Hydrogenation Sector Multiple-choice Question

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【Daily Question】 2016 07 08 Hydrogenation Section – Multiple Choice Question: What must be done when starting up the reaction system of a hydrogenation unit? A. Replace with nitrogen first, then ensure airtightness. B. Purge with steam first, then replace with nitrogen. C. Ensure airtightness with air first, then replace with hydrogen. D. Ensure airtightness first, then replace with nitrogen. A [Petrochemical Section] Initiative for adding prefixes to topics: http://bbs.hcbbs.com/thread-1573958-1-1.htm [Petroleum and Chemicals Section] Compilation of professional “basic knowledge” posts: http://bbs.hcbbs.com/thread-1557057-1-1.html Notice regarding the large-scale event “I’m saving energy; where are you?” in the Petrochemical Section: http://bbs.hcbbs.com/thread-1579199-1-1.html [Surprises when spending money]: http://bbs.hcbbs.com/thread-1599086-1-1.html “I’m spending money; where are you? @I’m saving energy; where are you?” http://bbs.hcbbs.com/thread-1580307-1-1.html 【Spending Money】 http://bbs.hcbbs.com/thread-1580307-1-1.html