摘要
对苯甲酸加氢过程中Pd／C催化剂的失活原因进行丁分析，研究了利用超临界CO2萃取再生失活Pd／C催化剂的过程，考察了萃取温度、萃取压力、CO2流量、共溶剂种类对Pd／C催化剂再生效果的影响。研究结果表明，超临界CO2萃取可以有效去除Pd／C催化剂表面吸附的有机杂质，恢复Pd／C催化剂的活性。利用超临界CO2萃取再生失活Pd／C催化剂的较件工艺条件：萃取温度333～353K，萃取压力15～25MPa，CO2流量（1g催化剂、常温、常压）20mL／h，以甲苯和二氯甲烷混合物为共溶剂。工业试验结果表明，在催化剂处理量320kg、萃取温度353K、萃取压力20MPa、萃取时间12h、超临界CO2流量1．5t／h、无共溶剂的条件下。失活Pd／C催化剂的活性可达到新鲜Pd／C催化剂活性的80％以上。
The deactivation of palladium carbon catalyst in hydrogenation of benzoic acid was analyzed and process for regenerating Pd/C catalyst was investigated by supercritical CO2 extraction elsewhere outside the reactor. Effects of process conditions, namely temperature, pressure, CO2 flow rate, and cosolvent on activity of Pd/C catalyst were studied. Activity of Pd/C catalyst regenerated by supercritical CO2 extraction was satisfactory. The optimal regeneration conditions were as follows： temperature 333-353 K,pressure 15-25 MPa, CO2 flow rate（ 1 g catalyst, normal temperature and normal pressure ）20 mL/h, cosolvent methylene chloride ＋ toluene. Industrial regeneration of deactivated Pd/C catalyst in a 500 L commercial unit （320 kg catalyst）showed that about 80% of catalyst activity was recovered by supercdtical CO2 extraction when regeneration took place at 353 K, 20 MPa, 1.5 t/h of CO2 flow rate. 12 h and without cosolvent.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第2期161-164,共4页
Petrochemical Technology
关键词
苯甲酸
加氢
钯
碳
催化剂
失活
超临界CO2
萃取
再生
benzoic acid
hydrogenation
palladium
carbon
catalyst
deactivation
supercritical carbon dioxide
extraction
regeneration
