Method of preparing nonionic surfactant o-benzenedicarboxylic acid polyethylene glycol ester

Abstract

The invention relates to a non-ion surface active agent diethyl phthalate, featuring in the material of ortho-phthalic anhydride and carbowax, storing in 75-85deg.C for 3-5 hours, neutralizing PH to 1.5-3.5, and the mole percent of ortho-phthalic anhydride and carbowax being 1: 0.9-1.1. It not only has wide extensive application, and significant in effect in improving solubility of water-soluble dye. It protects environment without generation of wastes, being able to produce with normal equipment and mild in reaction condition. It can keep the solution in normal temperature for 72 hours with even status.

Description

technical field [0001] The present invention relates to a kind of preparation method of nonionic surface active agent, more specifically a kind of preparation method of polyethylene glycol phthalate. Background technique [0002] Nonionic surfactants rank second only to anionic surfactants in the surfactant family. It is a compound with an amphiphilic structure that does not dissociate into ions in water. Its hydrophilic group is composed of polyethylene glycol group, that is, polyoxyethylene group-(C2H4O)n-. In addition, it is a structure based on polyols (glycerin, pentaerythritol; glucose, sorbitol, etc.). Structures based on ethanolamine, diethanolamine, etc. Most nonionic surfactants are in liquid or slurry state, and their aqueous solution will appear cloud point phenomenon as the temperature rises. Because it cannot be dissociated into ions in aqueous solution, it has high stability, is not affected by acid-base salts, has strong resistance to hard water, and has g...

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Problems solved by technology

In the patent document (publication number: CN1180075) published on April 29, 1998 by the State Intellectual Property Office "A Preparation Method for Rosin Acid Polyethylene Glycol Resin", the preparation method is described: rosin or disproportionated rosin As a raw material and equimolar polyethylene glycol, use phosphorous acid as a catalyst to carry out esterification reaction at 200-300 ° C, the reaction time is 1-6 hours, and prepare abietic acid polyethylene glycol fat nonionic surfactant, which has Excellent viscosity-reducing properties of heavy oil, but the reaction temperature of this process is relatively high, the requirements for equipment are high during the synthesis process, there are safety hazards, and the scope of application is small

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