含碘四氯化碳实验废液的回收利用

Recycling of Experimental Waste Liquid Containing Iodine and Carbon Tetrachloride

以"化学平衡常数及分配系数的测定"产生的含碘四氯化碳实验废液为原料,碘酸钾为氧化剂,以碘回收率为考察指标,探索了氧化萃取法的最佳回收条件。结果表明:碘酸钾用量为理论用量的1.2倍,硫酸用量为理论用量,反应时间为0.5 h时,进行V(CCl4)∶V(浓缩H20)为500 mL∶200 mL的大量废液回收实验,四氯化碳层碘回收率为91.43%。将回收得到的碘四氯化碳液循环用于该实验测定分配系数K d及平衡常数K c,与标准液对比,K d误差为0.75%,K c误差为1.87%。用此方法回收该实验废液,再循环用于该实验是可行的。

Exl）erinlental waste liquid from the experiment named determination of ehemieal equilibrium constant and partition coefficient was used as raw materials, The optimum conditions for recycling of the waste liquid containing iodine and CCl4 was investigated, in which KIO3 was employed as oxidants and recovery yield of iodine as research indieator. The resulls shows thai reeovery yield of iodine ean reach 91.43% under the tollowing conditions： 1.2 times theoretical amount of KIO3 and theoretical amount of sulfuric acid,reaetion time 0.5 h, V（CCl4） ： V（concentrate water） 500 mL ： 200 mL. Recycled carbon tetraehloride eontaining iodine was used in experimental determination of partition coeffieieney （K,I） and equilihrium constant（K ）. Compared with original CCl4 containing iodine, the error of Kd and Kc is 0.75% and 1.87%, respectively. The results indicate that recycling procedure is appropriate and recycled CCl4 containing iodine can be used in the experiments.