碳十芳烃含量对歧化装置的影响

Effect of C_(10) aromatic hydrocarbon content on disproportionation unit

中国石油辽阳石化公司歧化装置采用甲苯歧化及烷基转移技术,以甲苯、碳九芳烃(含碳十芳烃)为原料,选用配套的HLD-001催化剂,在进料量为(100±1)t/h,反应温度为347~350℃的条件下,可生产高附加值苯和二甲苯。结果表明:当原料中碳十芳烃质量分数为3.89%~8.81%时,甲苯转化率呈下降趋势,碳九芳烃转化率维持在50%~60%;碳十芳烃质量分数低于7.00%时,其转化率随着前者的增加而提高;高于此值时,转化率趋于稳定。为了确保循环氢摩尔分数达到80%~85%,随着原料中碳十芳烃质量分数增加,补充及排放氢气量均增加,氢气消耗量也随之提高。

The high value- added benzene and xylene were produced by toluene disproportionation and alkyl transfer technology with toluene and C9 ar- omatic hydrocarbon （containing C10 aromatic hydro- carbon） as raw materials at feed rate （100 ±1 ） t/h and reaetion temperature 347 -350 ℃ in a disprop- ortionation unit of Liaoyang Petrochemical Compa- ny, PetroChina. The results showed that when the mass fraction of C10 aromatic hydrocarbon was 3.89% -8.81%, the toluene conversion declined, and C9 aromatic hydrocarbon conversion maintained at 50% -60%. When the mass fraction of C10 aro-matic hydrocarbon was less than 7.00% , the conver- sion increased with the rising of the former;if higher than this value, the conversion tended to be stable. In order to ensure the mole fraction of circulating hydrogen was 80% -85% , the amount of hydrogen added and discharged increased ,with the mass frac- tion of C10 aromatic hydrocarbon increasing, and the consumption of hydrogen increased accordingly.