Abstract:

The research on resource utilization of wastewater from polyphenylene sulfide production was described. The organic solvent was used to extract and separate the organic matters in the wastewater. The best extraction conditions were obtained by exploring the influence of operation conditions on the extraction. The preferred extractant was dichloromethane, the extraction time was 3h, the extraction temperature was 303K, the volume ratio to solvent was 1∶1 and extraction was performed three times. After extraction treatment, the waste water was evaporated and crystallized to separate out sodium chloride, and the mother liquor was cooled to 298K to separate out phosphate. The results showed that the total yield of sodium chloride was 96.68%, and the purity was 99.27%; the yield of trisodium phosphate was 92.28%, and the purity was 98.88%. All products met the industrial product standard. In this experiment, the combination of solvent extraction and crystallization was used, which not only realized wastewater reuse and its component recycling, but also had the advantages of simple operation and energy saving.

Key words: PPS, wastewater, sodium chloride, trisodium phosphate, extraction, evaporation crystallization, cooling crystallization

摘要：

对聚苯硫醚（PPS）生产废水的资源化利用进行了研究，使用有机溶剂对废水中的有机物进行萃取分离。通过探究萃取过程中操作条件对萃取效果的影响，获得了最佳的萃取条件为：以二氯甲烷为萃取剂，萃取时间为3h，萃取温度可选择303K，适宜的溶剂比为1∶1，萃取级数为三级。对经萃取处理后的废水进行蒸发结晶析氯化钠，蒸发母液冷却至298K析磷酸盐，结果表明：氯化钠的总收率可达到96.68%，纯度为99.27%；磷酸三钠收率为92.28%，纯度为98.88%，产品均符合工业品标准。采用溶剂萃取与结晶相结合的方法，不仅实现了废水回用及其组分资源化利用的目的，而且具有操作简单以及节约能源的优点。

关键词: 聚苯硫醚, 废水, 氯化钠, 磷酸三钠, 萃取, 蒸发结晶, 冷却结晶