Research on Key Technology for the Recycling of Dimethyl Sulfone from Industrial Waste Salts
Industrial waste salt was used as raw material to purify and recover dimethyl sulfone(MSM).Firstly,the main components and contents of waste salt were analyzed and detected by extraction method,and then MSM was purified and recovered by step-by-step crystallization method.The effects of dissolution temperature,freezing temperature and brine ratio on the purification rate and purity of MSM were explored.The results showed that when the dissolution temperature was 60℃,m(MSM waste salt):m(water)=1:1,and the freezing temperature was 5℃,the recovery rate of MSM was more than 65%,and the purity of MSM was more than 98%.When the dissolution temperature is 60℃,m(MSM crude product):m(water)=1.2:1,and the freezing temperature is 5℃,the recovery rate of MSM is more than 65%,and the purity of MSM is more than 96%.This method effectively realizes the reduction and recycling of MSM industrial waste salt,which brings economic benefits to enterprises and saves landfill costs,which is of sustainable development significance.
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