原油有机氯的形态分析及脱除

以萃取脱氯为主要方法,测试了三乙基苄基氯化铵、三乙胺、二甲基甲酰胺(DMF)以及浓脱氯剂(TC-F)对油品中的氯元素的脱除效果,对提取出来的氯元素进行了形态分析。结果表明:TC-F可成功萃取大部分有机氯,萃取剂与油样的质量比为16.67%时洗涤纯化后的萃取率达到80.99%。有机氯的形态主要为5-氯,2-甲基苯胺、2,6-二氯,3-甲基苯胺及其同分异构体等苯胺类物质。使用TC-F脱氯剂在剂油比为1%时就能达到82.28%的脱氯率,剂油比8%时脱氯率为92.28%,再增加剂油比对脱氯率的提升不明显。该萃取脱氯的反应速度较快,在1%的剂油比时13 min即可反应完成。若使用脱氯剂B,在剂油比为6%之前其效果比TC-F脱氯剂好,剂油比6%时脱氯率89.57%,但剂油比继续提高时效果没有明显提升,而TC-F脱氯剂可达到92.77%,TC-F与脱氯剂B复配脱氯率提升1~3百分点,但加入脱氯剂B会引入硫杂质,因此推荐优先使用TC-F脱氯剂。

Structure identification and removal of organic chlorides in crude oil

The extraction dechlorination process was applied to test the removal effect of chlorines in the oil by triethylbenzylammonium,triethylamine,N-Dimethylformamide (DMF) and dechlorination agent TC-F,and the chlorines extracted were analyzed The results show that the dechlorination agent TC-F can successfully extract most of organic chlorides.The extraction rate after passivation is as high as 80.99％ when the extractant to oil ratio is 16.67％.The organochlorine impurities are mainly 5-chloro-2-methylaniline and 2,6-dichloro-3-methylaniline.The dechlorination rate is as high as 82.28％ at a 1％ of TC-F dechlorinating agent to oil ratio.When the agent to oil is 8％,the dechlorination rate is 92.28％.Further increase of agent to oil ratio has no obvious impact on dechlorination rate.The extraction dechlorination reaction is very fast and it can be completed within 13 minutes at a 1 agent to oil ratio.When dechlorination agent B is used,the dechlorination result at an agent to oil of no greater than 6％ is better than that of dechlorination agent TC-F,and the dechlorination rate is 89.57％ at an agent to oil ratio of 6％.Further increase of agent to oil ratio has no obvious effect on the rise of the performance of dechlorination agent B.The dechlorination rate of dechlorination agent TC-F can reache 92.77％.The application of dechlorination agent compounded with dechlorination agent TCF and dechlorination agent B can raise the dechlorination rate by 1.0 ～ 3.0 percent.Whereas,the addition of dechlorination agent B will bring in sulfide impurities,and dechlorination agent TC-F should be first selected for application.