Mg/Al氧化物催化高酸原油酯化降酸的研究

系统地研究了Mg/Al氧化物作为酯化降酸催化剂的性能。实验证明镁铝氧化物具有催化高酸原油酯化反应的能力，以蓬莱19-3高酸原油为原料，当催化剂加入量（w）为1%、醇酸摩尔比为3：1、反应温度为250℃、反应时间为1h时，酯化反应降酸率达90.5%，催化剂多次重复使用后催化活性没有下降。经分析，催化剂表面碱性强度的改变是催化活性改变的原因，随着碱性增强，降酸率增加。蓬莱19-3原油经酯化降酸后，原油酸值降至0.5 mgKOH/g以下，经实沸点蒸馏后，各馏分油酸值比酯化前大幅下降。

STUDY ON ESTERIFICATION FOR REDUCING TOTAL ACID NUMBER OF HIGH ACID CRUDE OIL BY MG/AL OXIDES

This paper studied the catalytic performance of Mg/Al composite oxides during esterification of high acid crude for reducing acid content. The results showed that this catalyst was able to catalyze esterification of high acid crude. Using Penglai 19-3 high acid crude under the conditions of a catalyst dosage of 1%, an ethanol to acid molar ratio of 3, a reaction temperature of 250℃ and a reaction time of 1h, the acid reduction rate via esterification reached 90.5%, and the catalyst could be reused several times without reducing activity. It was found that the activity of Mg/Al composite oxides increased with the increase of surface basicity. The acid value of Penglai 19-3 crude was reduced to less than 0.5 mgKOH/g by catalytic esterification, and the acid values of its fractions from true-boiling-point distillation reduced significantly as well.