Method for preparing sulfated methyl ester by ionic liquid catalysis method

Abstract

The invention relates to a method for preparing sulfated methyl ester by an ionic liquid catalysis method, and relates to the technical field of preparation of sulfated methyl ester by ionic liquid catalysis. The method comprises the following steps that: fatty acid methyl ester is used as a raw material, and a sulfated fatty acid methyl ester is prepared by an alkyl sulfonic acid pyridine ionic liquid catalyst under atmospheric pressure at a reaction temperature of 20 to 40 DEG C; the ionic liquid catalyst is added to the fatty acid methyl ester to be stirred, and the titration speed of sulfuric acid is controlled, so that the sulfuric acid is subjected to a sulphation reaction at a specified temperature in a water bath with a constant temperature; the reaction liquid in the steps is poured out, is placed in a separatory funnel, and is washed with 10wt% salt water until the reaction liquid is neutral. The method had the following advantages that: the iodine value of a product is small and can reach to 42.45 (the iodine value of the fatty acid methyl ester is about 110); the viscosity of biodiesel as a raw material is small, so that the mobility of the product is better, and the proportion of concentrated sulfuric acid is increased. The catalyst has good activity, the used amount of the catalyst is few, the carbonation can be reduced, the color of the product is lighter; the reaction conditions are mild, and the reaction time is short.

Description

technical field

[0001] The invention relates to a method for preparing sulfated methyl esters catalyzed by ionic liquids, which uses fatty acid methyl esters, namely biodiesel, as raw materials and ionic liquids as catalysts to prepare sulfated fatty acid methyl esters. Background technique

[0002] As a biological material, leather is mainly composed of collagen fibrils, which are industrially modified to prevent it from spoiling. The fatliquoring agent can process the leather to make the leather absorb a certain amount of oily material and have certain physical, mechanical and usable properties. Fatliquor is the most used leather chemical material in tanning production, and it plays a decisive role in improving leather feel and leather quality.

[0003] The ionicity of active substances in fatliquor can be divided into: anionic type, such as sulfated oil, sulfited oil, oxidized sulfited oil, phosphorylated oil, etc.; cationic type, such as fatty amine, quaternary ammonium...