Method for synthesizing polyether glycol in microstructure reactor

Abstract

The invention relates to a method for synthesizing polyether glycol in a microstructure reactor, which comprises the following steps: respectively pumping oxyalkylene and a catalyst liquid generated by reacting an alkaline catalyst and an initiator into the microstructure reactor composed of a micro-mixer and a retention time prolonging pipe, reacting while controlling the reaction temperature and pressure, neutralizing the reaction solution, adsorbing, degassing and filtering to obtain the refined polyether glycol. The hydroxyl value of the refined polyether glycol is 50-550 mgKOH / g, and the relative molecular mass is 300-3300 g / mol. The method overcomes the defects of long initiation time and low operational efficiency in the intermitted technique, solves the problems of complex equipment, high requirements for technological condition control and long retention time in the continuous technique, implements quick and continuous production, and has the advantages of short reaction time, simple technique, high safety, high controllability, high adjustment flexibility, continuous operation and the like.

Description

technical field [0001] The present invention relates to a preparation method of a class of polyether polyols, in particular to a method for synthesizing polyether polyols in a microstructure reactor, using polyols or polyamines as initiators, oxyalkylenes as monomers, and alkaline Catalyst for rapid and continuous preparation of polyether polyols in microstructure reactors. Background technique [0002] Polyether polyol is an important chemical raw material, widely used in industries such as papermaking, textile, printing and dyeing, synthetic leather, coating, adhesive, elastomer, foam plastic, sealant and petroleum development. The main raw material of the product. Polyether polyols are formed by ring-opening polymerization with low molecular weight polyols, polyamines or compounds containing active hydrogen as initiators, and alkylene oxides under the action of catalysts. Its conventional industrial production is usually carried out in a tank reactor. In this method, an...

AI Technical Summary

Problems solved by technology

However, the traditional preparation process mainly has the following three problems: (1) the reaction initiation time is long, resulting in the entire reaction cycle up to more than ten hours; The heat is very large, so the reaction temperature needs to be strictly controlled in the reaction process to avoid implosion due to temperature runaway; (3) due to the limited heat and mass transfer effect of the tank reactor, hot spots are easily generated in the reaction process, and the local reaction temperature is easy to exceed High, the transfer reaction of the active molecular chain increases, resulting in a decrease in the molecular weight of polyether polyols, an increase in unsaturated double bonds, and a broadening of the molecular weight distribution of the product

Although the spiral reactor can continuously prepare polyether polyols in the form of pseudo-turbulent flow, the inner diameter of the spiral reaction tube is at least 6.3mm, and the mixing effect is limited, resulting in too long residence time

At the same time, multiple temperature-changing operations also increase the difficulty of operation.

[0006] To sum up, the batch process has the problems of long initiation time, low operating efficiency, and easy reaction implosion, and the continuous process has the problems of complex equipment, high requirements for process condition control, and long residence time.

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