超临界条件下由合成气合成低碳醇的研究

Study on synthesis of higher alcohols from syngas under supercritical conditions

在固定床管式反应器中，在系统总压９．０ＭＰａ，合成气分压６．０ＭＰａ，空速２０００ｈ－１，反应温度２６０～３００℃，超临界介质正庚烷分压３．０ＭＰａ条件下，研究了共沉淀Ｃｕ～Ｃｏ催化剂的超临界相由合成气合成低碳混合醇的性能。结果表明，超临界相反应的ＣＯ转化率比气相反应高，醇选择性比气相反应低；超临界相与气相ＣＯ＋Ｈ２反应的产物均为Ｃ１～Ｃ５正构醇，醇分布规律基本相同，符合Ｓｃｈｕｌｚ－Ｆｌｏｒｙ分布方程，超临界相对合成低碳醇的链增长影响不大。以正庚烷为介质，在其临界温度以上，对合成醇反应有较强促进作用。

Catalytic performance of a coprecipitated Cu Co catalyst for synthesis of higher alcohols from syngas under supercritical conditions has been investigated in a fixed bed reactor. When the reaction is conducted at 260～300℃, syngas partial pressure 6.0MPa, GHSV 2000h -1 , and a partial pressure of n heptane medium, 3.0MPa, higher CO conversion and lower ROH selectivity are obtained in supercritical phase than in gas phase.The main products are n C 1 C 5 alcohols, obeying the Schulz Flory distribution for both reaction processes.Supercritical phase substantially has no effect on carbon chain propagation.Use of n heptane as reaction medium can significantly promote the synthesis reaction.