乙炔氢氯化的低汞催化反应动力学研究

Kinetic study of hydrochlorination of acetylene on low-mercury catalyst

以乙炔和氯化氢为主要原料,对在低汞催化剂上氢氯化合成氯乙烯的反应进行动力学研究,以此获悉自制的低汞催化剂对电石乙炔法合成氯乙烯的催化性能。采用Langmuir吸附等温线方程导出乙炔氢氯化反应低汞催化剂的动力学方程为rA=kKApApB/1+KApA+KCpC,并考察反应温度、乙炔空速和原料物质的量比对乙炔氢氯化反应速率的影响。结果表明,在反应温度170℃、乙炔空速28 h-1和n(C2H2)∶n(HCl)=1∶1.075条件下,乙炔转化率达98.92%,与高汞催化剂相当。

Using acetylene and hydrogen chloride as the main raw materials,the kinetic researches on hydrochlorination of acetylene on low-mercury catalyst were studied in order to learn the properties of home-made low-mercury catalyst.By adopting Langmuir＇ s absorbing isotherm equation,the kinetic equation for hydrochlorination of acetylene rA=kKAPAPB/1＋KApA＋KCpC was deduced.The influence of reaction temperature,acetylene space velocity and molar ratio of raw materials on the reaction rate for hydrochlorination of acetylene was investigated.The results showed that under the optimum reaction condition as follows：reaction temperature 170 ℃,acetylene space velocity 28 h-1,n （C2H2） ∶ n （HCl） =1∶ 1.075,acetylene conversion of 98.92% was attained,which was approximately equal to that on high-mercury catalyst.