A novel chemical looping technology for the synthesis of 2,2′-dibenzothiazole disulfide (MBTS) with zero emissions has been developed. Through chemical cycling between carbonate and bicarbonate in the reaction system, the insoluble 2-mercaptobenzothiazole (MBT) can become soluble in the aqueous phase of sodium carbonate and then be oxidized efficiently by hydrogen peroxide and the absorption of CO₂ with high selectivity. The mother liquor can be totally recycled by the desorption of CO₂ without any generation of salt-containing wastewater. With the new synthesis technology, the product has high purity and reaches the standard of a superior product that can be applied as a vulcanization accelerator. When 5.0 wt% hydrogen peroxide was added dropwise over 40 min at 50 °C, the conversion ratio of MBT was over 98%. The mother liquor was recycled 5 times and no side-products were found. The whole process is clean and pollution-free, which greatly reduces the burden of hazardous waste treatment and brings great environmental benefits.

中文翻译：

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合成2,2'-二苯并噻唑二硫化物的化学环化技术

已开发出一种新颖的化学环合成技术，用于合成零排放的2,2'-二苯并噻唑二硫化物（MBTS）。通过反应体系中碳酸盐和碳酸氢盐之间的化学循环，不溶性2-巯基苯并噻唑（MBT）可以溶于碳酸钠的水相，然后被过氧化氢和高选择性吸收CO ₂有效地氧化。母液可通过解吸CO ₂完全回收不会产生任何含盐废水。通过新的合成技术，该产品具有很高的纯度，并达到了可用作硫化促进剂的优质产品的标准。当在50℃下在40分钟内滴加5.0wt％的过氧化氢时，MBT的转化率超过98％。将母液再循环5次，未发现副产物。整个过程清洁无污染，大大减轻了危险废物处理的负担，带来了巨大的环境效益。