乐果是有机酸农药中一种高效低毒的内吸杀虫剂,甲基硫化物为其主要中间体之一,由无水甲醇和五硫化二酸在温度为45～50℃时反应生成。其反应为一放热反应,因此反应速度会逐步加快,随着反应速度的加快,放出的热量也随之增多,从而使反应器内的温度急剧上升。温度高了,反应剧烈, Dimethoate is a highly effective and low toxicity systemic insecticide in organic acid pesticides. Methyl sulfide is one of its main intermediates. It is formed by the reaction of anhydrous methanol and pentasulfuric acid at a temperature of 45-50 ° C . The reaction is an exothermic reaction, the reaction rate will be gradually accelerated, with the acceleration of the reaction, the release of heat also will increase, so that the reactor temperature rose sharply. High temperature, severe reaction,