Di-n-octyl sodium sulfonate itaconate and preparation method thereof

Abstract

The invention discloses di-n-octyl sodium sulfonate itaconate and a preparation method thereof. Itaconic acid, sodium bisulfite and n-octanol are taken as raw materials, and the di-n-octyl sodium sulfonate itaconate is prepared by performing sulfonation reaction and esterification reaction under the action of a polymerization inhibitor and an acid catalyst respectively. The molecular structure of the di-n-octyl sodium sulfonate itaconate is shown in the Specification. Compared with a conventional preparation process for a fatty acid ester sodium sulfonate surfactant, an adopted esterification-after-sulfonation synthesis process has the advantages that the problem of insolubility of two phases, i.e. an esterification product (oil-soluble) and a sulfonation agent (water-soluble) in a sulfonation reaction process is successfully solved, the sulfonation reaction process and an esterification reaction process can both be implemented in a homogeneous phase system, the use of a phase transfer catalyst in the conventional process is avoided, a production process route is simplified, and the purity and yield of a product are improved; the di-n-octyl sodium sulfonate itaconate product prepared by the synthesis process is high in yield, and can be used as a lubricant, a penetrating agent and the like.

Description

technical field [0001] The invention belongs to the technical field of novel surfactants, and more specifically relates to the proposal of a di-n-octyl sulfonate itaconate sodium salt surfactant and a preparation method thereof. Background technique [0002] Itaconic acid is an important organic acid, which is a renewable chemical raw material produced by fermentation of corn starch. The molecular structure of itaconic acid determines that its chemical properties are very active, and it can be widely used in many fields such as synthetic resin, rubber, chemical fiber, papermaking, medicine and food. [0003] In 2002, Yu Shitao and others synthesized dimethyl itaconate using itaconic acid and methanol as raw materials under the action of a catalyst; Chinese patents ZL 2009 10231146.6 and ZL 200910231145.1 disclosed di-n-butyl itaconate and Preparation method of diisooctyl ester; Chinese patent application number 201210482578.6 discloses a high molecular weight polybutylene i...

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned examples of preparing itaconic acid-based surfactants with itaconic acid and its derivatives as raw materials, most of them adopt the synthesis process route of first esterification and then sulfonation, because the esterification product (oil-soluble) and The problem of incompatibility between the two phases of the sulfonating agent (water-soluble), that is, the sulfonation process of itaconate is a heterogeneous reaction process, and it is necessary to add a phase transfer catalyst to improve the yield of the sulfonation reaction, or in the preparation of bis In the process of ester, a small amount of monoester is retained as a phase transfer catalyst for subsequent sulfonation reaction, but the above two methods will lead to an increase in the content of impurities in the product, affecting the purity and yield of the product