【Q&A Question 346】December 30, 2017
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【Q&A Question 346】December 30, 2017: What is the function of circulating hydrogen desulfurization? What desulfurization solvent to use? (1) Removing H2S increases the hydrogen partial pressure, which facilitates the progress of the hydrogenation reaction ； (2) Reduce equipment corrosion ； (3) Reduce the molecular weight of circulating hydrogen to lower the steam consumption of centrifugal compressors. The circulating hydrogen desulfurizer is MDEA. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please access it through the summary post below. 2017 Q&A Summary Thread (updates starting now) https://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) https://bbs.hcbbs.com/thread-1657794-1-1.html 2017 Daily Image Summary Thread https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 2017 LNG Version Daily Question List https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 2016 Q&A Summary Thread (updates completed) https://bbs.hcbbs.com/thread-1597792-1-1.html
(1) Removing H2S increases the hydrogen partial pressure, which facilitates the progress of the hydrogenation reaction； (2) Reduce equipment corrosion ；
Function: (1) Removing H2S increases the hydrogen partial pressure, which facilitates the progress of hydrogenation reactions； (2) Reduce equipment corrosion ； (3) Reduce the molecular weight of recycled hydrogen to lower the steam consumption in the compressor. The controlled H2S content in the recycled hydrogen is ≤1%, and the desulfurizing agent used is MDEA.
Reduce the hydrogen sulfide concentration in the circulating hydrogen to maintain the hydrogen sulfide concentration in the system.
(1) Removing H2S increases the hydrogen partial pressure, which facilitates the progress of the hydrogenation reaction； (2) Reduce equipment corrosion ； (3) Reduce the molecular weight of circulating hydrogen to lower the steam consumption of centrifugal compressors. The circulating hydrogen desulfurizer is methyl diethanolamine (MDEA).
Its function is desulfurization; a high sulfur content in the recycled hydrogen can cause corrosion of equipment and pipelines, resulting in poor hydrogenation efficiency. Therefore, it is necessary to maintain a low sulfur content in the recycled hydrogen. MD E A solution
Remove hydrogen sulfide from the circulating hydrogen, increase the hydrogen partial pressure, and ensure hydrogen purity; solvent: N-methyldiethanolamine
To reduce equipment corrosion and increase the hydrogen partial pressure, MDEA is generally used
(1) Removing H2S increases the hydrogen partial pressure, which facilitates the progress of the hydrogenation reaction； (2) Reduce equipment corrosion ； (3) Reduce the molecular weight of circulating hydrogen to lower the steam consumption of centrifugal compressors. The circulating hydrogen desulfurizer is MDEA.
If there is a high amount of hydrogen sulfide in the recycled hydrogen, it will corrode the pipeline equipment, leading to rust accumulation on the catalyst bed and an increase in pressure drop. From a chemical equilibrium perspective as well, hydrogen sulfide in the recycled hydrogen hinders the desulfurization reaction. Methyldiethanolamine