摘要
采用Aspen Plus模拟软件对预切割-丙烷吸收和丙烷洗两种前脱乙烷的甲醇制烯烃分离流程进行了模拟和优化,同时对两种工艺的模拟结果进行了比较。模拟结果表明,在保证乙烯和丙烯产品纯度大于99%的分离要求下,对前脱乙烷-预切割-丙烷吸收工艺,吸收剂用量选择为950 kg/h最适宜,乙烯损失率为0.6%;气相进料位置选择第35块塔板处,液相进料位置选择第9块塔板处。对前脱乙烷-丙烷洗工艺,吸收剂用量为1 200 kg/h最适宜,乙烯损失率为3.53%;适宜的循环物料进料位置为第31块塔板处,适宜的气相进料位置为第40块塔板处。比较两种工艺,从提高乙烯收率角度考虑,前脱乙烷-预切割-丙烷吸收工艺略有优势,可减少乙烯损失率和吸收剂用量;从降低能耗角度考虑,前脱乙烷-丙烷洗工艺略有优势,可减少脱甲烷塔冷量消耗。
Two front-end de-ethane processes including predistillation-absorption and propane washing of methanol to olefin separating process were simulated and optimized by using Aspen Plus, and its simulation results were compared. The result showed that, under the condition of ethylene and propylene purity were both up to 99%, for predistillation-absorption process, suitable absorbent consumption was 950 kg/h, ethylene loss fraction was 0.6%, gas feed stage was 35th and liquid feed stage was 9th. For propane washing process, suitable absorbent consumption was 1 200 kg/ h, ethylene loss fraction was 3.53%, gas feed stage was 40th and recycle liquid feed stage was 31 st. Compared two processes, considering from raising ethylene yield, predistillation-absorption performed superiority because of its lower ethylene loss fraction and absorbent flow rate, considering from reducing energy consumption, propane washing showed superiority because of its lower condenser duty for demethanizer.
出处
《石油化工》
CAS
CSCD
北大核心
2017年第12期1496-1499,共4页
Petrochemical Technology
关键词
甲醇制烯烃
分离
模拟
methanol to olefin
separation
simulation
