Study on the Whole Process of Triethylamine Recovery from Wastewater by Small Test
In this paper,the recovery process of triethylamine was studied by using strong acidic triethylamine wastewater as raw materials.Through the determination of the recovery scheme of triethylamine crude product,the selection of alkali,the amount of alkali and the final dehydration method were investigated.The results showed that the alkali adjustment,distillation,refining dehydration,pervaporation membrane dehydration steps were adopted.When the alkali adjustment pH was 12,the distillation temperature was 100℃,and the crude triethylamine was refined and dehydrated by 32%liquid alkali of 40%weight,and then further dehydrated by pervaporation membrane,triethylamine could be effectively recovered.The purity of the recovered triethylamine was more than 99%,the water content was less than 0.05%,and the recovery rate of triethylamine in the waste liquid was more than 96%.The recovered triethylamine could be directly recycled.There was no triethylamine residue in the residual liquid of the wastewater after treatment,and the COD of the wastewater was reduced by 91%,which laid a foundation for further treatment.
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