生产促进剂M废树脂制备苯并噻唑的工艺研究

Study on preparing benzothiazole from waste resin derived from synthesizing accelerator M

以废树脂为原料,通过改进氧化工艺,采用环保型氧化剂双氧水直接氧化制备苯并噻唑,附加值高,变废为宝,改善生态环境。以苯并噻唑收率为考察指标,探讨了投料比(甲苯/树脂)、氧化剂比例(双氧水/树脂)、反应时间、反应温度等因素对氧化反应的影响。最佳工艺实验条件:投料比(甲苯/树脂)2倍、氧化剂比例(双氧水/树脂)1.22倍、反应时间8 h、反应温度60℃。此工艺不经过氢氧化钠溶解过滤步骤直接用双氧水氧化,直接用甲苯溶解原料,省去甲苯萃取步骤,简化工艺流程,节约大量成本,同时废水含盐量大大降低,后续处理较容易。可为生产促进剂M产生的废树脂资源化利用提供一条新工艺方法。

The production of promoter 2-mercaptobenzothiazole(M)on the resource utilization of waste resins is an effective way to solve rubber accelerator industry solid wastes,and promote the process of solid waste reduction,recycling and harmless.Benzothiazole was prepared from waste resin as the raw material and hydrogen peroxide as an eco-friendly oxidant by improving the oxidation process.The factors which influence the yield of benzothiazole such as the ratio of m(toluene)∶m(resin),the ratio of m(H2O2)∶m(resin),the reaction time and the reaction temperature were explored and discussed.The optimal reaction conditions are as follows:m(toluene)∶m(resin)=2∶1,m(H2O2)∶m(resin)=1.22∶1,the reaction time is 8 h and the reaction temperature is 60℃.This process was not dissolved by sodium hydroxide,not filtered from the solution,oxidized with hydrogen peroxide directly and directly dissolved in toluene raw material,and eliminating toluene extraction process.Therefore,the technological process was simplified,a lot cost was saved,and the salinity of waste water is greatly reduced at the same time,the subsequent processing will become very easy.It provides a new technology for the resource utilization of waste resins produced by the production accelerator M.