烃类裂解结焦抑制剂的研究

Studies on the Coking Inhibitors of Hydrocarbon Pyrolysis

开发烃类裂解结焦抑制剂是现代石油化工中的重要研究课题,美国、苏联、日本等国已相继将其成功地用于乙烯装置,我国于80年代开始研究这种抑制剂,且已取得一些进展,由于我国的裂解原料日趋重质化,结焦问题尤为突出,本文以大庆轻柴油为裂解原料,对获得高效、廉价结焦抑制剂进行了研究。

The effects of both alkali-metal salts such as potassium carbonate and organic sulfide-phosphate compounds such as CRS have been investigated on the pyrolysis of light gas oil with a continous flow laboratory pyrolysis unit. The effects of operating conditions such as temperature and the ratio of steam to oil etc. have also been investigated. The results show that the apparent rate of coke formation decreases by 30-70 percent by coating the inner wall of the reactor with 0. 002-0. 010 kg per square meter of potassium carbonate. If we add 0. 0001-0. 0005 kg/kg CRS in the feedstock, not only the rate of coke formation decreases by 20-50 percent, but also the state of deposited coke becomes fragible , and the yields of ethylene and propylene increase. In addition, according to the experimental results and some concepts from referenc articles, the mechanism of coking inhibition by inhibitors such as potassium carbonate and CRS has been discussed in detail.