异丙苯在酸性催化剂上的主要化学反应路径

REACTION PATHWAYS OF CUMENE CRACKING OVER ACIDIC CATALYST

采用小型固定流化床装置（ACE—Model R），研究了反应温度在450～600℃范围内，异丙苯在酸性催化剂上的主要化学反应路径。结果表明，异丙苯在酸性催化剂上的主要化学反应有脱烷基反应、烷基侧链裂化反应、烷基转移反应和氢转移反应等，其中脱烷基反应是最主要的化学反应，其选择性为67％～88％；烷基侧链裂化反应选择性为1％～2％；烷基转移反应选择性为1％～10％；氢转移反应选择性为1％～3％。提高反应温度既有利于脱烷基反应又有利于烷基侧链裂化反应，烷基侧链裂化反应选择性的增加有利于C1～C2等小分子烃类和短侧链芳烃的生成，但高温不利于烷基转移反应和氢转移反应。

The dominant reaction pathways of cumene over acidic catalyst were investigated under the temperature range of 450--600℃ in a laboratory fixed fluidized bed reactor （ACE-Model R）. The results indicated that the dominant reactions were dealkylation, protolytic cracking in the alkyl side chain, transalkylation and hydrogen transfer during cumene catalytic cracking, among which dealkylation was the most predominant reaction with the product selectivity of 67%--88%. The selectivity of products produced by protolytic cracking in the alkyl side chain, transalkylation and hydrogen transfer were 1% - 2%, 1% - 10% and 1%- 3%, respectively. High reaction temperature was in favor of dealkylation and protolytic cracking in the alkyl side chain, in which the later formed small molecular hydrocarbons and aromatics with short chain, while transalkylation and hydrogen transfer went against with increasing reaction temperature.