响应面法优化煤焦油电化学脱水的操作条件

Optimization for Electrochemical Dehydration Process of Coal Tar Using Response Surface Methodology

采用YS-3电脱盐试验与破乳剂评选仪,对中温热解煤焦油电化学脱水进行了实验。考察了破乳剂加入种类和加入量、电场强度、去离子水加入量、脱水温度、脱水时间等6个单因素对煤焦油电化学脱水效果的影响,采用响应面法对破乳剂加入量、去离子水加入量、脱水温度、脱水时间进行了优化。实验结果表明,在8种破乳剂中,以多乙烯多胺类引发剂合成的水溶性XD-2破乳剂的破乳效果最好;煤焦油电化学脱水的优化条件为:电场强度900 V/cm、脱金属剂加入量30.0μg/g、去离子水加入量13.4%(φ)、破乳剂加入量17.4μg/g,脱水温度108℃、脱水总时间17.3 min,在此条件下,脱水率最高达到99.5%,煤焦油中水含量最低为127.7μg/g,符合加氢原料油进料要求。

The electrochemical dehydration of medium temperature coal tar was studied in an electrostatic desalter and YS-3 dehydration equipment. The effects of different demulsifiers, electric field intensity, demulsifier dosage, deionized water dosage, dehydration temperature and time on the dehydration were investigated through single-factor experiments. The above conditions were optimized by response surface methodology. The results indicated that water-soluble XD-2 demulsifier showed the best performance, which was synthesized with polyethylene polyamine as initiator. Under the optimum process conditions of electric field intensity 900 V/cm, desalting agent 30.0 μg/g, deionized water 13.4%（φ）, the demulsifier 17.4 μg/g, dehydration temperature 108 ℃ and dehydration time 17.3 min, the dehydration rate to the medium temperature coal tar and the water content in the coal tar reached 99.5% and 127.7 gg/g, respectively. The treated coal tar can be used as hydrogenation feedstock.