三釜凝聚工艺在异戊橡胶生产中的应用

Application of three-kettle coagulation process in isoprene rubber production

在异戊橡胶(IR)生产过程中为了将胶液中残留己烷质量分数脱除到不大于0.5%(占总己烷溶剂的0.1%),参照中国石化北京燕山分公司橡胶一厂顺丁橡胶装置的凝聚条件,通过理论计算对比了分别采用单釜、两釜和三釜凝聚工艺时的蒸汽耗量,并确定了生产IR的最佳凝聚工艺及条件。结果表明,不同凝聚工艺下每吨IR所需蒸汽量从大到小依次为单釜凝聚、两釜凝聚、三釜凝聚,在三釜凝聚工艺中将气相烃类带出凝聚釜的蒸汽消耗占总蒸汽消耗的68%左右,三釜凝聚工艺的总蒸汽消耗比两釜凝聚工艺低19%,理论计算说明IR生产过程中宜采用三釜凝聚工艺;采用的三釜凝聚工艺最佳条件为1#釜压力(35±3)k Pa,温度(87±2)℃;2#釜压力(55±3)k Pa,温度(101±2)℃;3#釜压力(20±3)k Pa,温度约99℃。

In order to remove the residual hexane in rub- ber solution to less than 0. 5% （mass fraction, 0.1% of total hexane solvent） in isoprene rubber （IR） production process, the steam consumptions in single-kettle, two-kettle and three- kettle coagulation processes were compared, and the optimum coagulation process and its conditions of IR were determined by theoretical calculation based on the coagulation process condition of cis-1,4-polybutadiene rubber unit in Synthetic Rubber Factory No 1 of Beijing Yanshan Petrochemical Co Ltd, SINOPEC. The results showed that order of unit steam consumption from large to small was single kettle, two-kettle,three-kettle. In three-kettle coagulation process, the steam consumption for removing gas phase hydrocarbon from the kettle accounted for 68% of total steam consumption, which was 19% lower than that of two-kettle coagulation. The re- sults of theoretical calculation indicated that three-kettle coag- ulation was available for IR production, and the optimum con- ditions were （35±3）k Pa, （87±2）℃; forkettle （55±3）k Pa, （101±2）℃ for kettle 2, and （20±3）k Pa, 99 ℃ for kettle 3 #.