Method of preparing surfactant by alkali lignin by modification

Abstract

The invention relates to a method of preparing a surfactant by alkali lignin by modification, belonging to the technical field of lignin utilization. The method comprises the following steps: by taking waste alkali lignin in industrial production as a raw material, first, carrying out reaction with dodecyl glycidyl ether and N, N-dimethylbenzylamine in dimethylsulfoxide; and then carrying out reaction with chlorosulfonic acid and neutralizing and dialyzing the product to obtain the alkali surfactant. According to the method provided by the invention, waste alkali lignin in industrial production is effectively utilized to facilitate the environmental protection, and meanwhile, the reaction conditions are mild without high temperature and high pressure conditions, and the reaction conditions are easy to control and adjust, so that the reaction process is simple, the production equipment is relatively simple, the product is low in cost, and the method has a very good industrial application prospect. The surface tension of the lignin surfactant prepared by the method reaches 29.17mN / m, thereby satisfying the active demands on industrial production and daily washing.

Description

technical field

[0001] The invention relates to a method for preparing a surfactant by modifying alkali lignin, which belongs to the technical field of lignin utilization. technical background

[0002] As a renewable resource with abundant reserves in nature, lignin is the most abundant natural aromatic polymer with its annual output second only to cellulose. At present, lignin mainly comes from chemical pulping, bioethanol processing, and organic solvent pulping. In industrial processing, lignin mainly provides heat in the form of combustion, and its use value is low. If the waste liquid rich in lignin is discharged, it will waste resources, and the cost of wastewater treatment is huge. Through molecular design and structural modification, the properties of lignin can be changed, and chemicals with high added value can be prepared to realize efficient utilization of lignin, which not only has important ecological benefits, but also has significant economic benefits. [00...