Method for synthesizing paraphthaloyl chloride through continuous flow in microchannel reactor
AssigneeJiangsu Yangnong Chemical Group Co., Ltd
InventorsLin Xu, Yiming Wang, Bo Shao, Kehong Ding, Hui Yan, Chenchao Bian, Hui Zhao, Yushuang Wang
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Abstract
The disclosure provides a method for synthesizing paraphthaloyl chloride through terephthalic acid chlorination in a reaction mode of a microchannel continuous flow. Compared with an existing technology, this method has characteristics of accurate control of reaction conditions, high phosgene/triphosgene utilization ratio, low catalyst dosage, high TPA conversion ratio within few tens of seconds of reaction time, high TPC yield and the like.
Claims10
A method for preparing paraphthaloyl chloride through terephthalic acid chlorination in a microchannel reactor, wherein the method comprises the following steps:
- (1);
- a preparation of raw materials:
- a. firstly melting a paraphthaloyl chloride, and then putting a terephthalic acid and a catalyst into the paraphthaloyl chloride, stirring and mixing, and conducting heat-preserving in a 90 DEG C oil bath to obtain a TPA slurry;
- and
- b. putting a solid triphosgene, conducting stirring, melting and heat-preserving in a 85 DEG C oil bath to obtain a triphosgene liquid;
- (2) reaction process:
- in a reaction process, using a continuous flow microchannel reactor, guiding the TPA slurry through a heat-preserving insulative slurry pump and a phosgene through a mass flow meter (the triphosgene liquid is fed using a heat-preserving plunger pump), and the two materials enter the reactor in proportion and preform a mixing reaction, to obtain a TPC crude product, absorbing a tail gas by connecting water and alkali.
Dependencies are inferred from the claim text.