摘要
针对甲苯选择性歧化法获得的高对二甲苯含量的料液,设计了一种新型的连续悬浮结晶工艺——单级冷冻、两次结晶。该工艺的特点是单级冷冻降低了能耗,料液进入温度较高的结晶器结晶,排出的母液进入温度较低的热交换器结晶成核。通过物料衡算和热量衡算,对连续悬浮结晶工艺的可行性进行了分析。连续悬浮结晶工艺可获得纯度为99.9%的对二甲苯产品,收率最高可达91.8%,单级冷冻能耗为144.0kJ/kg。与传统工艺比较,连续悬浮结晶工艺的对二甲苯收率提高了31%,能耗降低了15.3%。
A new continuous suspension crystallization process was developed to separate p-xylene from xylol with high content p-xylene, which was produced by the newly developed selective disproportionation of toluene. The process adopted single-stage refrigeration and two-stage crystallization. The feedstock with high content p-xylene was fed into crystallizer with higher temperature and then the discharged mother liquor was sent into heat exchanger with lower temperature to nucleate. Feasibility of the process was investigated by calculating material balance and heat balance. By application of new process, purity of p-xylene product can reach 99.9% mass fraction, yield of p-xylene 91. 8 %, and energy consumption 144.0 kJ/kg. Compared with traditional process, yield of p-xylene can increase by 31% while energy consumption can decrease by 15.3 %.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第11期1052-1055,共4页
Petrochemical Technology
基金
同济大学理科基金项目(1380219052)
