A kind of production method of safe and environment-friendly carbonate-based mixed solvent

Abstract

The invention relates to a method for producing safe and environment-friendly carbonic ester series mixed solvents. Raw materials of dimethyl carbonate and an initiator in the presence of a catalyst are subjected to a transesterification. The initiator comprises a first initiator, which is at least one selected from the group containing ethanol, isopropyl alcohol, isobutyl alcohol, n-butyl alcohol, glycol, diglycol and glycerol, and a second initiator, which is least one selected from the group consisting of ethyl acetate, isopropyl acetate, SEC-butyl acetate and isobutyl acetate. The catalyst comprises a first catalyst, which is at least one selected from the group consisting of sodium methoxide, sodium ethoxide, potassium methoxide, potassium ethoxide, triethanolamine and polyethylene glycol, and a second catalyst, which is at least one selected from the group consisting of dibutyltin oxide, tetrabutyl titanate, rare earth salt and rare earth oxide. The through selection of catalyst and initiator, the invention uses an ester exchange method to obtain carbonic ester series solvents with different boiling points, which can be used as green and environment-friendly coating solvents.

Description

technical field

[0001] The invention relates to the field of chemical industry, and more specifically, the invention relates to a method for preparing a carbonate-based mixed solvent by using dimethyl carbonate as a raw material through transesterification. Background technique

[0002] The boiling point of dimethyl carbonate (DMC) is 90°C, which is between ethyl acetate (73°C) and toluene (110°C); it was recognized as a non-toxic solvent by the European Union in 1993; and it is compatible with polyurethane, polyacrylic acid, It is compatible with various resins such as nitrocellulose, and miscible with various industrial solvents such as benzene, ketones, acetates, and ethers. As a green solvent, it began to be popularized and used in the market at the end of the last century.

[0003] Ethyl methyl carbonate (EMC) has a boiling point of 108-109°C. As an asymmetric carbonate compound, it is mainly used as a solvent and an intermediate in organic synthesis, especially as a so...