摘要
针对酸析法回收对苯二甲酸(TA)中存在沉淀分离较困难、脱水性能差的问题,对碱减量废水中TA回收工艺影响因素进行了分析探讨,获得的优化回收工艺参数是:酸析pH值3.5～4.0;滴定过程中搅拌速度300 r/min,时间1～2 min;凝过程中搅拌速度60～100 r/min,时间5～10 min;沉降时间10～12 h。在该工艺条件下,粗TA酸析回收率为77%,酸析TA絮体平均粒径11.56μm,碱减量工艺废水COD_(Cr)去除率50.5%。
Parameters affecting recovering of terephthalic acid （TA） from alkali-peeling process wastewater by acidificationsedimentation were studied. The optimal parameters were as follows, pH value 3.5 -4.0, stirring 1 -2 minutes at the rate of 300 r/min during acidification, stirring 5 - 10 minutes at the rate of 60 - 100 r/min during flocculation, sedimentation time 10 - 12 h. The recovery rate of TA preform was 77% and the mean particle size of TA floccules was 11.56 μm. Additionally, the removal rate of CODcr was 50.5 %.
出处
《印染》
北大核心
2010年第2期30-33,共4页
China Dyeing and Finishing
关键词
废水处理
碱减量
对苯二甲酸
回收
工艺参数
wastewater treatment
alkali deweighting
terephthalic acid
recovery
process parameter
