Abstract: hydrogen sulfide gas was emitted from heating up the calcium polyisobutylene thiophosphonate , which is the cause of its odor. The production of hydrogen sulfide when calcium sulphonate mixed with other additives was detected. It was found that more H2S was released when calcium polyisobutylene thiophosphonate was mixed with ZDDP and calcium alkyl benzene sulfonate. The influence of post-treatment process on the emission of hydrogen sulfide was investigated, and it was found that the emission of hydrogen sulfide decreased to different degrees after the addition of post-treatment agent, among which post-treatment agent X had the best effect. The effects of hydrolysis reaction time and calcification promoter type on the synthesis of calcium thiophosphonate were investigated. The improved synthetic process was helpful to satisfy the requirements of the performance of calcium thiophosphonate detergent. At the same time, the mass fraction of hydrogen sulfide released by the product was less than 20 μg. /g and met the requirements for safe use.

Key words: H2S, odor, post-treatment, calcium polyisobutylene thiophosphonate