Abstract:

The green deacidification technology of diesel by the ammonia-alcohol method without using strong acid and strong base can achieve zero-emission.But it has some problems, such as requiring larger amounts of ammonia and solvent, and higher energy consumption of regeneration solvent.To overcome the shortcomings of the ammonia-alcohol method, this paper experimentally studied the green deacidification technology of diesel by the ammonia-alcohol method, which used low-temperature coalescence filtration in a self-made experimental device.The effects of coalescence filtration temperature, amount of ammonia, alcohol consumption, volume ratio of solvent to oil on the deacidification process, material regeneration of coalescence filtration, deacidification’s turndown ratio and the product quality of naphthenic acid were studied.The results showed that under the optimum operation condition, the acidity of straight-run diesel could decrease from 62.9 mg KOH·(100 ml)^-1 to 4.2 mg KOH·（100 ml）^-1, the acid removal rate was as high as 93.3%, and product recovery could reach 98.6%.After refining, the quality of diesel could meet industry requirements ［acidity X<7.0 mg KOH·（100 ml)^-1］, and raw acid value of naphthenic acid could meet No.2 acid standards of SH/T 0530—92.This method had the advantages of simple technological process, low operating temperature of deacidification, less ammonia and solvent consumption, low solvent regeneration energy consumption and higher turndown ratio.

Key words:

直馏柴油, 绿色脱酸, 聚结过滤, 醇氨溶剂, 环烷酸

摘要： 柴油醇氨法绿色脱酸技术具有不使用强酸强碱和实现零排放等特点，但存在氨与溶剂用量大、溶剂再生能耗高等问题。为克服醇氨法的缺点，在自制的实验装置上采用低温聚结过滤法对柴油醇氨法绿色脱酸技术进行实验研究。考察了氨用量、乙醇用量、剂油体积比、聚结过滤温度等对脱酸效果的影响以及聚结过滤材料的再生、脱酸的操作弹性和环烷酸产品的质量。研究结果表明，在最优操作条件下，直馏柴油酸度可以从62.9 mg KOH·（100 ml)^-1降至4.2 mg KOH·（100 ml)^-1，脱酸率高达93.3%，精制后的柴油产品质量满足工业要求[酸度X﹤7.0 mg KOH·（100 ml)^-1]，环烷酸粗酸值满足SH/T 0530—92的2号酸标准。该方法具有流程简单、脱酸操作温度低、氨与溶剂用量低、溶剂再生能耗低和操作弹性高等优点。

关键词:

直馏柴油, 绿色脱酸, 聚结过滤, 醇氨溶剂, 环烷酸