Continuous production of fatty poly-ester carbonate polyhydric alcohol

Abstract

The invention discloses a continuous production process of aliphatic polycarbonate polyols. The process has the characteristics of small investment in equipment, high utilization rate, stable product weight, low energy consumption and high catalyst utilization rate; the aliphatic polyol of the present invention The continuous production process of carbonate polyols uses carbon dioxide / epoxide as the main raw material to react under the action of a catalyst to produce aliphatic polycarbonate polyols. The reaction is a continuous operation using a loop reaction device. The main equipment includes loop reaction device, condenser, gas-liquid separator, high-pressure carbon dioxide buffer tank, carbon dioxide compressor, mixing tank and high-pressure metering pump.

Description

technical field [0001] The present invention relates to a kind of production technology of polyol, more specifically relates to a kind of continuous production technology 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. It is quite different from traditional polycarbonate materials, but more than aliphatic polyester Alcohols are similar to polyether polyols, and are between polyester and polyether polyols, such as having a lower glass transition temperature (glass transition), better room temperature flexibility, etc., prepared from this polyol 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 elastomers and the high mechanical strength, excellent wear resistance ...

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

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