A production process of citric acid type polycarbonate polyether polyol

By adopting partitioned premix and gas-liquid dual circulation mode in the production process of polycarbonate polyether polyol, combined with dual-flow atomization nozzle and static mixer, the problems of low functionality and molecular weight reduction caused by deactivation of DMC catalysts are solved, and the mechanical properties and production efficiency of the product are significantly improved.

CN119119452BActive Publication Date: 2025-03-18HEFEI POLY ADVANCED MATERIALS TECH CO LTD
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Patent Information

Application Number
CN202411616705.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-13
Publication Date
2025-03-18
Estimated Expiration
2044-11-13

AI Technical Summary

Technical Problem

In industrial production, when using citric acid as the starting agent to prepare polycarbonate polyether polyols, the DMC catalyst is deactivated, resulting in low actual functionality, a decrease in molecular weight and an increase in by-products, affecting the mechanical properties.

Method used

A production process of citric acid-type polycarbonate polyether polyol was designed, and the citric acid was used to prevent the passivation of the catalyst activation center by citric acid, and a gas-liquid mass transfer zone was set up in the column reactor. The gas-liquid dual circulation mode was adopted, and the dual-flow atomization nozzle and a static mixer were used to accurately control the material circulation flow rate and temperature.

Benefits of technology

The conversion rate of propylene oxide and the functionality of citric acid-type polycarbonate polyether polyol are improved, local overheating and explosive polymerization are prevented, and the problems of low functionality and low molecular weight are solved. The mechanical properties in polyurethane foaming applications are significantly improved, and the production efficiency and product quality are improved in industrial production.

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Abstract

The invention belongs to the technical field of polycarbonate polyether polyols, and provides a production process of citric acid type polycarbonate polyether polyols. The production process is carried out in a tubular reaction device, and comprises a premixing unit, a reaction unit and a post-processing unit. The premixing unit adopts a partitioned premixing form to prevent citric acid from passivating the activation center of a catalyst. A gas-liquid mass transfer zone with a specific ratio is provided in the tubular reactor of the reaction unit, a gas-liquid double circulation mode is adopted, a double-flow atomizing nozzle with a specific structure is designed, a static mixer is arranged in the reaction zone, and the material circulation flow rate and range temperature are accurately controlled, so that the conversion rate of propylene oxide and the functionality of the citric acid type polycarbonate polyether polyol are effectively improved, the by-product content is reduced, the mechanical properties of the citric acid type polycarbonate polyether polyol in polyurethane foaming applications are improved, and the production efficiency and product quality can be significantly improved in industrial production.
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