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甲苯二异氰酸酯(TDI)光气法生产可分为液相和气相两种工艺,早期建设的装置以液相工艺为主,即间位甲苯二胺与光气在液相中以高度稀释的溶液形式进行反应,反应后需通过蒸馏脱除溶剂以提纯TDI产品,因此消耗大量能量。液相工艺按照其生产路线可分为两种:一种是Dupont公司开发的传统工艺,以邻二氯苯为光气化反应溶剂,工艺流程相对简单,溶剂消耗低,不发生副反应,但反应收率低,原材料消耗较大,造成TDI
Toluene diisocyanate (TDI) phosgene production can be divided into liquid and gas phase two processes, the early construction of the device to the liquid phase-based process, namely meta-toluene diamine and phosgene in the liquid phase with a highly diluted solution After the reaction, the solvent needs to be removed by distillation to purify the TDI product, thus consuming a large amount of energy. Liquid phase process according to its production line can be divided into two kinds: one is Dupont company developed the traditional process, o-dichlorobenzene phosgenation reaction solvent, the process is relatively simple, low solvent consumption, no side effects, but Low reaction yield, high consumption of raw materials, resulting in TDI