纸层析实验过程中废液的回收与纯化

Reclaiming and Purification of Waste Liquid from Inorganic Paper Chromatography Test

无机纸层析实验过程中产生大量的丙酮废液,针对其直接分馏回收率低(21%),回收后残液达不到排放要求的问题,提出一种改进方法——溶盐分馏法。该方法根据废液含有强酸的特性,采用不同浓度的氢氧化钠中和废液中的酸,分别对酸碱中和产生的溶盐废液和盐沉淀过滤后的废液进行溶盐分馏和普通分馏。实验结果表明,溶盐分馏产品回收率达91%,纯度达99.52%,与普通分流相比,产品回收率平均提高8%,纯度提高0.39%。经估算,每回收500 ml丙酮相比委外加工处理节省实验费用约20元。

Recycling the wastes is an effective way to reduce the pollution in laboratories. A lot of waste acetone is produced in the inorganic paper chromatography test, and direct fractionation is of low recycle efficiency. In order to meet the requirement of residual liquid discharge standard, this paper proposed a refined method-soluble salt fraetionation metho（t. Due Io the strong acid characteristic of residual liquid, NaOH is used to neutralize the acid. Then tile waste is treated with dissolved salt fractionation and general fractionation （ after salt precipitation filtration）. The result shows that the recovery rate is 91% and the purity of acetone can be 99.52% with dissolved salt fractionation. Compared with ordinary distillation, the recovery rate is 8% higher and the purity of acetone increases by 0.48%. The recovery for each 500ml of acetone could reduce the cost by 20 yuan compared to outsourcing process.