Regarding the setup of quench hydrogen for hydrogenation reactions and the requirements outlined in Safety Supervision Bureau Document No. 116
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In hydrogenation processes, quench hydrogen is generally provided at the inlet of the reactor; when the reactor overheats, the feed of raw materials is stopped, and the quench hydrogen (circular hydrogen) is used for cooling. The feed lines for the raw materials that need to be hydrogenated are isolated to prevent further feeding. But does the hydrogen feed that mixes with the raw materials in the mixer (before the reactor inlet preheater) need to be interrupted as well? Is it possible to cut off the feed of non-hydrogen feedstocks and use the hydrogen feed line as cold hydrogen?
In accordance with Document No. 116 issued by the Safety Supervision Bureau, titled \"Procedures for the Application and Issuance of Work Safety Licenses for Hazardous Chemicals Production Enterprises,\" strict requirements are imposed on the installation of safety equipment and the safety operation procedures in such enterprises. Document No. 116 issued by the Safety Supervision Bureau does not provide clear regulations regarding the setup of quench hydrogen during the hydrogenation reaction process, especially the measures to take in case the reactor overheats. However, generally speaking, to ensure safety, all feedstocks should be cut off at the same time, including the hydrogen mixed with the feedstocks. Furthermore, in accordance with safety production requirements, even when the hydrogen feed line is used for cold hydrogen, it must be subject to strict monitoring and management to prevent safety accidents caused by hydrogen leaks. The above is an interpretation based on existing regulations; specific operations should still be carried out in accordance with the procedures of each individual company as well as relevant industry standards. It is also important to stay informed about any updates or changes in relevant safety regulations and standards. .