萃取法处理DSD酸氧化废水  

Treatment of Oxidation Wastewater in DSD Acid Production by Extraction Method

作　　者：高飞 

机构地区：[1]山西青山化工有限公司,山西运城044100

出　　处：《化工环保》2015年第3期300-304,共5页Environmental Protection of Chemical Industry

摘　　要：以二甘醇单丁醚-二甘醇单乙醚-对二甲苯体系为萃取剂,0.1 mol/L的NaOH溶液为反萃取剂,采用三级萃取-反萃取法处理4,4＇-二氨基二苯乙烯-2,2＇-二磺酸氧化废水,考察了萃取和反萃取的影响因素,并对废水中的可用有机资源进行了回收.实验结果表明：在V（二甘醇单丁醚）∶V（二甘醇单乙醚）=1∶3、V（醇醚）∶V（废水）=2∶5、V（对二甲苯）∶V（废水）=1∶5的最佳萃取条件下,经三级萃取工艺处理后,平均COD去除率达92.0％、平均脱色率达96.4％、BOD5/COD＞ 0.3,可生化性明显增强;最佳反萃取条件为V（NaOH溶液）∶V（有机相）=13∶24、反萃取温度60℃;平均总硝基化合物回收率达88.9％,平均萃取剂回收率达96.7％,回收的萃取剂可循环使用.该工艺对废水处理的综合成本约为700～1 000元/t.The oxidation wastewater in production of 4,4＇-diaminostilbene-2,2＇-disulfonic acid （DSD acid） was treated by three-stage extraction-back-extraction process,using diethylene glycol monobutyl ether-diethylene glycol monoethyl ether-dimethylbenzene as extractant and 0.1 mol/L NaOH solution as back-extractant.The factors affecting extraction and back-extraction were studied and valuable organic resources were recovered from the wastewater.The experimental results show that：Under the best extraction conditions of V（diethylene glycol monobutyl ether） ∶ V（diethylene glycol monoethyl ether）=1 ∶ 3,V（alcohol ether） ∶ V（wastewater）=2 ∶ 5,V（dimethylbenzene） ∶ V（wastewater）=1 ∶ 5 and extraction time 3,the average COD removal rate is 92.0％,the average decolorization rate is 96.4％,BOD5/COD ＞0.3,which indicates that the biodegradability of the wastewater is improved obviously;The best back-extractant conditions are V（NaOH solution） ∶ V（organic phase）=13 ∶ 24 and back-extractant temperature 60 ℃;The recovery rates of total nitro-compounds and extractant are 88.9％ and 96.7％ respectively,and the recovered extractant can be reused.The total cost of the wastewater treatment process is 700-1 000 Yuan/t approximately.

关 键 词：萃取 反萃取 4 4'-二氨基二苯乙烯-2 2'-二磺酸氧化废水 二甘醇单丁醚 二甘醇单乙醚 对二甲苯 

分 类 号：X703[环境科学与工程—环境工程]