关键词: 室温, 环烷酸, 脱酸剂, 聚结过滤

Abstract: Research on the deacidification of distillates under ambient temperature using deacidified agent and coalescing filter was carried out in lab and the effects of coalescing filtration temperature, alkali consumption, volume ratio of agent to oil, stirring intensity and reaction time on the acid removal were investigated. It was found that under ambient temperature with optimum operation conditions of an alkali consumption of 1.0 (mole ratio of sodium hydroxide to naphthenic acid), an agent/oil volume ratio of 0.02, a stirring intensity of 300 r/min and a reaction time of 40 s, the acid number of refined straight run diesel fuel was 0.2 mgKOH/(100mL) and with a yield of 99.8%. The operation was flexible and the oil content of alkali waste obtained by coalescing filtration was much lower as compared with that by conventional electro-alkali refining and deacidification using deacidified agent I or II. The quality of naphthenic acid reached the 2# acid standard of SH/T0530-92 with low oil content. Adopting deacidification technology with coalescing filtration under ambient temperature, the high voltage electric field was eliminated, the deacidification process was much simplified, thus the operation cost and energy consumption were reduced significantly.

Key words: room temperature, naphthenic acid, deacidified agent, coalescing filtration