黑液高温气化合成混合醇的操作条件分析

Operation Conditions Analysis of Higher Alcohol Synthesis via Syngas from High Temperature Gasification of Black Liquor

中文关键词:  黑液气化  混合醇合成  反应动力学模型  操作条件

Key Words:black liquor gasification  higher alcohols synthesis  kinetic modelling  operation conditions

中文摘要:

      采用Aspen plus模拟含碳气体净化流程，得到净化气中CO2含量与H2S含量、吸收剂流量、再生器热负荷的关系；对基于K/MoS2催化剂和固定床反应器的混合醇合成过程进行模拟和产物预报、优化黑液高温气化制备混合醇的合成条件，得到反应气CO2含量、催化剂装填比、反应温度、反应压力对CO单程转化率、总醇选择性、烃选择性、CO2选择性、总醇时空产率、C2+醇质量分数的影响规律。结果表明，为改善混合醇反应性能和降低公用工程消耗，适宜的合成条件为：合成温度310~330℃、催化剂装填比20~30 g·h/mol、合成压力9~11 MPa、反应气CO2含量1.6%。

Abstract:

      The objective of the paper is to optimize the operation conditions of higher alcohol synthesis via raw syngas from high temperature gasification of black liquor. The process of CO2 removal from syngas is simulated by commercial software Aspen plus. The variations of H2S content, absorbent consumption and heat load for absorbent regeneration with CO2 content in clean singes (reactant) are analyzed. The synthesis process is analyzed based on the model of a fixed bed reactor and K/MoS2 catalyst. Products distributions and yields are predicted. The influence of operation conditions, including CO2 content in reactant, catalyst loading, reaction temperature and pressure on CO conversion ratio, selectivities of alcohol, hydrocarbon, CO2 and ester, mass content of C2+ alcohol and space time yield are studied by sensitive studies. Analysis results show that the optimum operation conditions of the reactor are: temperature 310~330℃, pressure 9~11 MPa, catalyst loading ratio 20~30 g·h/mol and CO2 content 1.6%.