连续制备甲苯二异氰酸酯的方法

Method for continuously preparing toluene diisocynate

Abstract

本发明涉及一种连续制备甲苯二异氰酸酯的方法,具体涉及光气法制备粗甲苯二异氰酸酯的方法。在本方法中,甲苯二胺和溶剂DEIP混合,在喷射反应器中同过量液态光气进行低温光化反应,在光化反应塔中加热裂解,使中间产物甲苯二氨基甲酰氯进一步分解生成甲苯二异氰酸酯,将回收光气和溶剂DEIP循环使用,副产物氯化氢气体送氯化氢吸收系统。
The invention relates to a method for continuously preparing toluene diisocynate, in particular to a method for preparing coarse toluene diisocynate by a phosgene method. The method comprises the following steps: mixing toluene diamine and DEIP solvent, performing low-temperature photochemical reaction on the mixture and excessive liquid phosgene in a jet reactor, heating and cracking a reaction product in a photochemical reaction tower to further decompose toluene dicarbamic chloride serving as an intermediate product to form the toluene diisocynate, recycling the reclaimed phosgene and the DEIP solvent, and delivering the hydrogen chloride gas serving as a side product to a hydrogen chloride absorption system.

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Cited By (8)

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    CN-103724229-AApril 16, 2014青岛科技大学, 青岛银科恒远化工过程信息技术有限公司一种甲苯二异氰酸酯生产过程中的脱水方法
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    CN-103910613-BMarch 23, 2016淄博职业学院一种利用生产甲苯二异氰酸酯的氯化氢生产原乙酸三甲酯的方法
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