摘要
为有效回收涤纶碱减量废渣中的对苯二甲酸(TPA),用N,N-二甲基甲酰胺(DMF)作为溶剂,蒸馏水为析出剂,并以活性炭为除杂脱色剂,通过溶析结晶的方法从碱减量废渣中回收TPA。采用红外光谱、紫外分光光度计和酸值滴定分析了回收产物的基团、纯度和酸值等。结果表明,废渣与DMF、活性炭与废渣的合理质量比分别为1∶12、0.6∶1;回收的TPA产品纯度接近于标准试剂(纯度≥99.0%),酸值达到标准试剂酸值的96.43%,回收率达到86.54%;采用DMF溶剂能够有效回收碱减量废渣中的TPA。
For the purpose of effective recovery of terephthalic acid （TPA） from polyester alkali deweighting waste water, dissolving-crystallization method is applied to separate the TPA from the waster residue, using N, N-dimethylformamide （DMF） as solvent, distilled water as precipitating agent and active carbon as decoloriser. The functional groups in the recovered product are identified by infra-red spectrum （IR） , and the purity and acid value are determined by UV spectrophotometry and acid value titration, respectively. The rational mass ratios of the waste residue to DMF and the activated carbon to the waste residue are 1 ： 12 and O. 6 ： 1, respectively. The purity of recovered TPA is close to that of the standard TPA reagent （purity ≥ 99% ）. The acid value reaches 96.43% of that of the standard TPA reagent. The recovery rate is 86.54%. The research shows that the TPA in alkali deweighting wastewater can be recovered effectively by using DMF solvent.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2013年第12期12-15,共4页
Journal of Textile Research
基金
中央高校基本科研业务费专项资金资助项目(JUSRP31104)
生态纺织教育部重点实验室(江南大学)开放课题(KLET1012)
关键词
碱减量
对苯二甲酸
回收
有机溶剂
alkali deweighting
terephthalic acid
recovery
organic solvent
