首页|二氧化碳加氢制甲醇过程碳氢利用率的影响因素与工艺优化分析

二氧化碳加氢制甲醇过程碳氢利用率的影响因素与工艺优化分析

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原料CO2和H2利用率是影响CO2加氢制甲醇过程经济性的重要因素.本文讨论了催化剂类型、温度、压力、空速和H2/CO2进料比等因素对CO2转化率和甲醇选择性的影响以及工艺条件对气液相中碳氢损失的影响,提出了利用汽提方式回收液相中溶解CO2的循环工艺,并分析了弛放量对碳氢利用率与工艺经济性的权衡关系,确定了最佳的弛放率.结果表明:经过汽提之后,液相中溶解的CO2损失已可忽略不计,碳氢损失主要取决于气相弛放;随着弛放气流量的增大,设备投资费用逐渐减小,而单位生产成本先减小后增大;在弛放率为1%的条件下,与传统工艺流程相比,含汽提的CO2加氢制甲醇循环工艺的CO2利用率为98.9%,H2利用率为65.9%,具有较高的原料利用率.本研究为CO2加氢制甲醇高效转换提供了一条可行路径.
Influencing factors of CO2 and H2 utilization rate in CO2 hydrogenation to methanol and process optimization design
The utilization rate of CO2 and H2 raw materials is an important factor affecting the process economy of CO2 hydrogenation to methanol.The influences of catalyst type,temperature,pressure,space velocity and H2/CO2 feed ratio on CO2 conversion and methanol selectivity,and the influences of process conditions on the loss of carbon and hydrogen in gas and liquid phase were discussed,respectively.A cycle process for CO2 hydrogenation to methanol was proposed by introducing the stripping unit to recover the dissolved CO2 from liquid phase.The effects of purge gas on carbon and hydrogen utilization and process economy were studied to determine the optimal rate of purge gas.The results showed that the loss of dissolved CO2 was negligible after stripping separation and the loss of carbon and hydrogen mainly depended on the purge gas.The equipment investment cost decreased gradually with the increase of the purge gas flowrate while the unit production cost firstly decreased and then increased.The utilization rate of CO2 and H2 were respectively 98.9%and 65.9%when the flow rate ratio of purge to feed was set as 1%.Compared with the traditional process,the proposed process had an effective utilization of raw materials.This study provides a feasible path for efficient conversion of CO2 hydrogenation to methanol.

carbon dioxidemethanolprocess simulationprocess analysisoptimization design

王东亮、李婧玮、孟文亮、杨勇、周怀荣、范宗良

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兰州理工大学石油化工学院,甘肃 兰州 730050

甘肃省低碳能源化工重点实验室,甘肃 兰州 730050

二氧化碳 甲醇 过程模拟 过程分析 优化设计

国家自然科学基金联合基金甘肃省科技计划甘肃省科技计划

U22A2041522YF7GA16022JR5RA219

2024

化工进展
中国化工学会,化学工业出版社

化工进展

CSTPCD北大核心
影响因子:1.062
ISSN:1000-6613
年,卷(期):2024.43(5)
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