Continuous production of fatty poly-ester carbonate polyhydric alcohol

Abstract

Continuous production of fatty polycarbonate polyol is carried out by taking carbon dioxide / epoxide as raw materials and reacting under action of catalyst to obtain the final product in cyclic reactor. The main apparatus consists of cyclic reactor, condenser, vapor-liquid separator, high-pressure carbon dioxide buffer tank, carbon dioxide compressor, mixing kettle and high-pressure metering pump. It costs low is efficient.

Description

technical field [0001] The present invention relates to a production process of polyol, more particularly to a continuous production process of aliphatic polycarbonate polyol. Background technique [0002] Aliphatic polycarbonate polyol is a new type of polyol resin, its molecular main chain contains aliphatic alkylene and carbonate group repeating units, which is quite different from traditional polycarbonate materials, and more than aliphatic polyester. Alcohols and polyether polyols are similar, and between polyester and polyether polyols, such as having a lower glass transition temperature (glass transition), better room temperature flexibility, etc., prepared with this polyol as raw material Polyurethane materials have many unique properties. For example, this type of polyurethane elastomer has the excellent hydrolysis resistance and low temperature flexibility of polyether polyurethane elastomer and the high mechanical strength, excellent abrasion resistance and oil re...

AI Technical Summary

Problems solved by technology

The process is a three-phase reaction of vapor, liquid and solid. Due to the use of a tank reactor, the mixing effect of the system is poor during industrial scale-up, and reaction dead ends are prone to occur, resulting in poor product quality stability.

In addition, due to the high pressure of the carbon dioxide / epoxide copolymerization reaction, during industrial scale-up, as the volume of the reactor increases, the energy consumption of mechanical stirring and investment costs will increase sharply, resulting in an increase in production costs

At the same time, for high-pressure reactions, the utilization rate of the tank reactor is low, and its feeding capacity is generally only 1 / 2-2 / 3 of the effective volume of the reactor.

The above reasons cause the high production cost of aliphatic polycarbonate polyol, and the product market competitiveness is low, which affects the large-scale industrial production and application of the resin

Images