Method for preparing glyceride carbonate by using loop reaction device

Abstract

A method for preparing glyceride carbonate by using a loop reaction device comprises the following steps: adding glycerin, dimethyl carbonate and an alkali catalyst into a loop reactor, starting a loop circulating pump, pumping out the materials from the bottom of the loop reactor into an outer circulating heat exchanger so as to raise the temperature of the materials, ejecting the materials into the loop reactor by using an ejector so as to circulate the materials, and reacting the materials; emitting methanol steam and dimethyl carbonate steam which are generated in the reaction together with nitrogen from the upper part of the loop reactor into a separating tower, wherein the dimethyl carbonate is condensed, and reflows from the bottom of the separating tower into the loop reactor, the methanol and the nitrogen flow out from the top of the separating tower into a methanol gas phase condenser so as to condense the methanol, and a small amount of uncondensed methanol, dimethyl carbonate and nitrogen is pumped into the loop reactor by the ejector of the loop reactor for further reaction; and after the reaction, evaporating out excessive dimethyl carbonate gas from the upper part of the loop reactor, enabling the dimethyl carbonate gas to enter a dimethyl carbonate gas phase condenser to be condensed and collected, and obtaining the glyceride carbonate from the loop reactor. The method has the advantages of no pollution and high mass and heat transfer efficiency.

Description

technical field [0001] The invention relates to a method for preparing glycerol carbonate by using a loop reaction device with glycerin and dimethyl carbonate as raw materials under the condition of an alkaline catalyst. Background technique [0002] Glycerol carbonate is a new type of important chemical product, which is a cyclic carbonate. Glycerol carbonate has a wide range of uses and a large market demand. It can be used as a solvent in the production of emulsifiers, paint removers, paints and cosmetics. Glycerol carbonate and its derivatives can also be used as electrolytes for fuel cells, and as liquid membranes for the separation of carbon dioxide and nitrogen. Due to its active nature, glycerol carbonate can be used as an intermediate in the production of chemical products, for example, it can be used to produce glycidyl ether, and it can also be used to produce glycosides, cross-linked polymers, pharmaceutical intermediates, etc. [0003] CN 101811971 A, US 60255...

AI Technical Summary

Problems solved by technology

[0006] JP 2001172277 A describes a method for preparing glycerol carbonate with glycerol and dimethyl carbonate under the action of an alkali metal carbonate catalyst in a reactor. This method uses a homogeneous catalyst, and the subsequent purification of the product is complicated.

[0007] The current method for preparing glycerol carbonate, from raw materials, prices, and reaction conditions, synthesis yield analysis, dimethyl carbonate and glycerol reaction synthetic glycerol is a kind of green environmental protection and economical method, existing glycerol and dicarbonate The method for preparing glycerol carbonate from methyl esters all adopts a tank-type stirring reaction process, and the tank-type stirring process not only has poor mass and heat transfer efficiency, but also has problems such as methanol being discharged into the environment and causing environmental pollution because the reaction system is not closed.

Images