Naphthenic acid removal from crude oil through catalytic decarboxylation on magnesium oxide
Naphthenic acid removal from crude oil through catalytic decarboxylation on magnesium oxide
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DOI：
10.1016/j.apcata.2006.01.038
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发表时间：
2006-04
影响因子：
5.5
通讯作者：
A. Zhang;Qisheng Ma;Kang-Shi Wang;Xicai Liu;P. Shuler;Yongchun Tang
中科院分区：
文献类型：
--
作者：
A. Zhang;Qisheng Ma;Kang-Shi Wang;Xicai Liu;P. Shuler;Yongchun Tang
环烷酸(NA)已被公认为石油生产和炼油中的主要腐蚀源之一。本文研究了羧酸模型化合物的催化脱酸和原油中环烷酸的脱除。开发了一种金属氧化物催化剂--氧化镁，并根据二氧化碳的生成和酸的转化，考察了其对环烷酸等羧酸类化合物脱酸反应的催化效果。主要反应发生在150-300℃的温度范围内。氧化镁在体系中的作用是多方面的。它具有通过酸碱中和吸附酸性化合物的能力，在升高的温度下还能促进脱羧基和碳氢化合物裂解等反应。直接在原油中加入氧化镁可显著脱除环烷酸，降低原油的总酸度，如FT-IR测定的RCOOH浓度的降低和总酸值(TAN)的降低。
Naphthenic acid (NA) has been recognized as one of the major sources of corrosion in oil production and refining. In this study, catalytic decarboxylation of carboxylic acid model compounds and naphthenic acid removal from crude oil were investigated. A metal oxide catalyst, MgO has been developed and its effectiveness in catalyzing decarboxylation reactions involving carboxylic acid compounds such as naphthoic acid has been determined based on the formation of CO2and the conversion of acid. The major reaction takes place in the temperature range of 150–300°C. The role of MgO in the system is considered to be multiple. It has the ability to adsorb acidic compounds via acid–base neutralization and it can also promote reactions such as decarboxylation and hydrocarbon cracking at the increased temperature. Direct application of MgO to crude oil results in significant naphthenic acid removal and lower total acidity of the oil as evidenced by a decrease in RCOOH concentration as determined by FT-IR and a lower total acid number (TAN).