| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrogen chloride production-preventing agent in a crude oil atmospheric pressure distillation unit by preventing the production of hydrogen chloride itself, not by neutralizing the produced hydrogen chloride and without exhibiting a bad effect on a catlyst, and a method for preventing hydrogen chloride from its production. SOLUTION: This method for preventing hydrogen chloride from its production is provided by addingβ-hydroxyethyl trimethyl ammonium hydroxide (choline) so as to become 0.1-5 fold mol equivalent, especially an equal to 2 fold mol equivalent against a salt content in a desalted crude oil, into the desalted crude oil from a crude oil-desalting device 1 to a main distillation column 7 in the crude oil atmospheric pressure distillation unit. The amount of the choline to be added is adjusted based on a result of measurement obtained by measuring the chloride ion concentration or pH of water discharged from an overhead receiver 9 of the main distillation column 7. COPYRIGHT: (C)2004,JPO&NCIPI
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