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
Life of this patent
Estimating the term…
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.
Claims22
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
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 to obtain a TPA slurry;
- and
- b. melting a solid triphosgene to obtain a triphosgene liquid;
- or, preparing phosgene;
- (2) reaction process:
- in a reaction process, using a continuous flow microchannel reactor, using the TPA slurry as a first flow of a material, and using the triphosgene liquid or the phosgene as a second flow of a material;
- and
- respectively feeding the first flow of the material and the second flow of the material into the microchannel reactor for performing 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.