利用新技术降低巯基乙酸异辛酯的色度

Use of New Technologies to Reduce the Chromaticity of Isooctyl Thioacetate

巯基乙酸异辛酯传统的生产工艺生产的产品色度大于20(铂钴法)为有效降低异辛酯的色度,研究新的工艺"二级酸化液除杂,一级粗酯还原技术"。通过锌粉还原去除酸化液中的二硫化碳等无机杂质,选用更为安全的二甲苯代替乙醚去除酸化液中的硫氨酯、异丙醇和一乙胺等有机杂质,使用锌粉去除粗酯中的多聚酯替代传统工艺的碳酸氢钠中和去除多聚酯,并研究了锌粉用量对色度的影响,确定了最佳工艺参数,酸化液和粗酯色度都从传统工艺的大于40降至小于20。

The Chromaticity of isooctyl thioacetate produced by the traditional production is more than 20(platinum cobalt method). In order to effectively reduce the Chromaticity of isoctyl ester,a new process 'secondary acidating liquid removal and primary crude Ester reduction technology' was studied. Using zinc reduction to remove inorganic impurities such as carbon disulfide in the acid solution,use safer xylene instead of ether to remove organic impurities such as thiamine,isopropanol,and monoethylamine in the acid solution,and use zinc to remove the polypolyester in the crude Ester instead of sodium bicarbonate in the traditional process and remove polypolyester. The influence of the amount of zinc on the Chromaticity was studied,and the optimum process parameters were determined. The Chromaticity of acid solution and crude Ester was reduced from more than 40 to less than 20.