Preparation method of unsaturated fatty acid-estertype diesel antiwear agent

Abstract

The invention discloses a preparation method of an unsaturated fatty acid-ester typediesel antiwear agent. The method includes adding glycerin, a fatty acid type diesel antiwear agent and a glycerin and manganese chloride complex into a reaction kettle for uniform mixing according to the mass ratio of 100-200:100:5-15. The reusable homogeneous glycerin and manganese chloride complex serving as a catalyst is adopted, reaction time is short, catalytic efficiency is high, both glycerin and the catalyst which are unreacted are recyclable, the non-acid non-basic homogeneous catalyst is used during preparation, product quality is improved beneficially, no wastewater is discharged in subsequent treatment processes, and requirements of national environmental protection are met.

Description

technical field [0001] The invention relates to a preparation method of a diesel antiwear agent, in particular to a preparation method of an unsaturated fatty acid ester type diesel antiwear agent. Background technique [0002] With the increasingly stringent environmental protection regulations, the control of indicators such as sulfur content in diesel oil is becoming more and more stringent. The refinery must reduce the sulfur content through deep hydrotreating, but at the same time, some natural lubricating substances in diesel are also removed, resulting in a significant decline in the lubricating performance of diesel. In order to improve the lubricity of low-sulfur diesel oil, adding diesel antiwear agent is a very effective means to improve the lubricity of diesel oil. At present, the most economical and effective oil lubrication improvers for low-sulfur diesel are three types of antiwear agents: unsaturated fatty acids, fatty amides and unsaturated fatty acid ester...

AI Technical Summary

Problems solved by technology

At present, the most economical and effective oil lubrication improvers for low-sulfur diesel are three types of antiwear agents: unsaturated fatty acids, fatty amides and unsaturated fatty acid esters: (1) Unsaturated fatty acid antiwear agents: mainly composed of long-chain proper Purified vegetable unsaturated fatty acids such as soybean oil fatty acid or soybean oil fatty acid, but due to the high content of saturated fatty acids, the oil solubility with diesel oil is poor, and the product is highly acidic, which can easily cause diesel engine nozzles to be blocked and fuel injection pumps to wear more (2) Fatty amide anti-wear agent: patent W09618706 and patent EP798364 respectively use salt or amide prepared by reaction of fatty acid and fatty amine to prepare anti-wear agent to improve the lubricity of diesel oil, but diesel oil prepared by fatty acid and amide is anti-wear agent Abrasives can easily lead to deterioration of the oxidation stability of diesel; (3) Unsaturated fatty acid ester antiwear agents: China mainly uses unsaturated fatty acid ester diesel lubricity improvers, which are mainly long-chain fatty acids The esterification product formed with glycerol contains a strong ester group and a long carbon chain, which can form a dense adsorption film on the metal surface, which can effectively reduce friction and wear. Chinese patent CN102295961 discloses a low Sulfur diesel oil lubricity additive and its preparation method, using vegetable fatty acid and glycerol to prepare diesel oil antiwear agent under alkaline conditions, but in the preparation process due to the addition of alkaline homogeneous catalyst, unsaturated fatty acid acid-base reaction is prone to occur , leading to the residue of metal ions in the product, affecting the lubricating performance of diesel oil