中低温煤焦油电脱盐处理技术研究

采用电脱盐法,在破乳剂和脱金属剂共同作用下,对一种中低温煤焦油进行脱水、脱盐及脱金属预处理研究。确定电脱盐工艺最佳条件为:电场强度为1 000 V/cm,处理温度为140℃,注水比例为6%,破乳剂加入量为30~50 ppm,处理时间为20 min。在此工艺条件下处理后的煤焦油中盐含量由19.73 mg/L降低到12.96 mg/L,脱盐量达到34%以上,水含量由100%降低到13%,金属脱除量达到27%以上。经过预处理的煤焦油能够满足后续加工过程的需求。

Study on Desalination Technology of Moderate-low Temperature Coal Tar

Dehydration,desalination and demetallization of a moderate-low temperature coal tar were studied by electric desalting method under combined action of demulsifier and demetallization agent. The optimum conditions were determined as follows: the electric field intensity 1000 V/cm, the treatment temperature 140℃, the water injection ratio 6%, the demulsifier amount 30 ~ 50 ppm, the treatment time 20 min. The salt content in the coal tar treated under above conditions was reduced from 19.73 mg/L to 12.96 mg/L, the desalination amount was more than 34%, the water content was reduced from 100% to 13%, the metal removal rate was more than 27% The pretreated coal tar can meet the needs of subsequent processing.