K_2CO_3/Al_2O_3固体碱催化酯化原油脱酸  

APPLICATION OF K_2CO_3/AL_2O_3 SOLID ALKALINE CATALYSTS TO REMOVE ACID FROM CRUDE OIL BY ESTERIFICATION

作　　者：吴雁[1] 王豪[1] 钟婷[1] 郭营营[1] 熊敏[1] 

机构地区：[1]西南石油大学化学化工学院,四川成都610500

出　　处：《西南石油大学学报（自然科学版）》2011年第2期152-156,18-19,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：四川省教育厅青年基金(08ZB003);"油气藏地质及开发工程"国家重点实验室开放基金(PLN0907)

摘　　要：开发高效催化剂是提高原油催化酯化脱酸效率的关键。将K2CO3/Al2O3固体碱催化剂用于原油的酯化脱酸,用XRD、N2吸附-脱附、Hammett指示剂-苯甲酸滴定法表征催化剂性质,研究活性组分含量及酯化反应条件对催化剂性质和活性的影响。结果表明:当K2CO3负载量为25%时,活性组分呈多层分散,催化剂比表面积和孔体积显著下降。催化剂的总碱量(H->9.3)和弱碱量(9.3<H-<15.0)随K2CO3负载量的提高先增加后降低,弱碱中心是酯化反应的主要活性中心。K2CO3负载量为20%时,催化剂总碱量、弱碱量和活性最高,在反应温度200℃,反应时间2 h,催化剂和醇用量分别为原油质量的1%和2%时,可将辽河原油酸值由11.17 mgKOH/g降到0.25 mgKOH/g,脱酸率达97.8%,并且重复使用性能良好。Developing esterification catalysts with high performance is considered to be a key factor to improve the efficiency of catalytice sterification.Compared with the conventional acidice sterification catalysts,the solidalkaline catalysts show better anti-poisoning property and higher stability.A series of alumina-supported K2CO3 catalyst is prepared by pore volume impregnation method and used in the esterification reaction to remove acid from crude oil.The property of catalysts is characterized by XRD and N2 adsorption-desorption.Hammett indicator and benzene carboxylic acid titration method are used to measure the basicity strength and basicity amount distribution on the catalysts.The effects of K2CO3 content on catalysts' property and deacidfication activity are investigated and the esterification reaction conditions are studied.It is shown that the poor dispersed multilayer K2CO3 crystallites are form edonthecatalyst which contains 25% K2CO3,causingag reatdecrease of specific surface area and porevolume of catalyst.The total basicity amount(H->9.3) and weak basicity amount(9.3<H-<15.0) of K2CO3/Al2O3 will be increased with the increase of K2CO3 loading until it reaches 20%,and if the increase continues,it will lead to the decrease of basicsites.Theresults also indicated that the weak basic sites with 9.3<H-<15.0onK2CO3/Al2O3 make major contribution to the catalyst's deacidfication activity.The catalyst loaded with 20% K2CO3 has the greatest amount of weak basic sites and thus the highest catalytic activity.It can remove 97.8% acid of Liaohe high acidity crude oil and the acid value of crude oil can be decreased from 11.17 mgKOH/g to 0.25 mg KOH/g under the optimal reaction conditions of reaction temperature 200 ℃,reaction time 2 h,catalyst and glycol mass fraction 1% and 2%,respectively.Moreover,the K2CO3/Al2O3 catalyst shows good repeated-use performance.

关 键 词：K2C03/A1203 固体碱 酯化 原油 脱酸 

分 类 号：TE624.1[石油与天然气工程—油气加工工程]