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Refining method of polyether polyol

A technology of polyether polyol and refining method, which is applied in the field of chemical synthesis to achieve the effects of high molecular weight, low odor and low content of volatile organic compounds

Active Publication Date: 2020-03-20
SHANDONG BLUSR DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no very effective additives have been developed so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] to 15m 3 Add 12t crude polyether polyols in the polyether polyol refining still. Nitrogen replacement is carried out, and the oxygen content in the refining tank is measured to be less than 100ppm. The temperature of the refining kettle was raised to 90° C., a slight positive pressure was maintained in the kettle, and the stirring speed was kept at 30 rpm / min. Open the solenoid valve of the pure water feeding pipeline, add 30kg of pure water through the pipeline mixer, the flow rate of pure water is 5t / h, and keep the temperature at 20°C when the pure water is added. Then open the solenoid valve of the acid feeding pipeline, let 36kg of phosphoric acid and 180kg of pure water flow through the pipeline mixer together, the flow rate of pure water is 4t / h, keep the temperature when pure water is added at 20°C, and the flow rate of phosphoric acid is 0.8t / h , keep the temperature when phosphoric acid is added at 40°C, then rinse the pipeline mixer and feed line with 60kg ...

Embodiment 2

[0035] to 15m 3 Add 12t crude polyether polyols in the polyether polyol refining still. Nitrogen replacement is carried out, and the oxygen content in the refining tank is measured to be less than 100ppm. The temperature of the refining kettle was raised to 90° C., a slight positive pressure was maintained in the kettle, and the stirring speed was kept at 30 rpm / min. Open the solenoid valve of the pure water feeding pipeline, add 60kg of pure water through the pipeline mixer, the flow rate of pure water is 10t / h, and keep the temperature at 25°C when the pure water is added. Then open the solenoid valve of the acid feeding pipeline, let 60kg of sulfuric acid and 420kg of pure water flow through the pipeline mixer together, the flow rate of pure water is 10t / h, keep the temperature when pure water is added at 25°C, and the flow rate of sulfuric acid is 1.43t / h , keep the temperature when the sulfuric acid is added at 60°C, then rinse the pipeline mixer and feed line with 80kg...

Embodiment 3

[0038] to 15m 3 Add 12t crude polyether polyols in the polyether polyol refining still. Nitrogen replacement is carried out, and the oxygen content in the refining tank is measured to be less than 100ppm. The temperature of the refining kettle was raised to 90° C., a slight positive pressure was maintained in the kettle, and the stirring speed was kept at 30 rpm / min. Open the solenoid valve of the pure water feeding pipeline, add 32kg of pure water through the pipeline mixer, the flow rate of pure water is 6t / h, and keep the temperature at 30°C when the pure water is added. Then open the solenoid valve of the acid feeding pipeline, let 72kg of oxalic acid and 300kg of pure water flow through the pipeline mixer together, the flow rate of pure water is 6t / h, keep the temperature when pure water is added at 30°C, and the flow rate of oxalic acid is 1.44t / h, keep the temperature when oxalic acid is added at 50°C, then rinse the pipeline mixer and feeding pipeline with 90kg of pu...

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Abstract

The invention belongs to the technical field of chemical synthesis and particularly relates to a refining method of polyether polyol. The refining method comprises the following steps: (1) firstly, adding rough polyether polyol into a neutralization kettle, and introducing acid and water into the neutralization kettle through a pipeline mixer for neutralization until the pH value is 6.8-7.2; and (2) crystallizing, drying and filtering polyether polyol neutralized in the step (1), cooling to 30-90 DEG C, adding an adsorbent, and continuously stirring for 20-40 minutes, so as to obtain the low-odor polyether polyol product. By carrying out refining production by virtue of the refining method, on the one hand, the carbonization and degradation of partial materials caused by the direct contactwith acid can be avoided; on the other hand, the acidification process is carried out in a closed condition, so that the oxidation of polyether polyol caused due to the entry of air can be avoided; and the adsorbent is added and stirred after oxidation, neutralization, drying and filtration, so that refined polyether polyol is high in molecular weight and low in unsaturated value and odor, and the contents of volatile organic compounds are low.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a method for refining polyether polyols. Background technique [0002] Polyether polyol is an important raw material for the production of polyurethane foam. In recent years, with the rapid development of the polyurethane industry, the quality requirements of polyurethane products for its upstream raw material polyether polyol are getting higher and higher. The refined post-treatment process of polyether polyol It directly affects the intrinsic quality of polyether polyols. [0003] The post-refinement treatment process of polyether polyol includes neutralization, adsorption, crystallization, drying, filtration, etc., among which the selection of neutralizing agent and the addition process have a great influence on the quality of post-refinement treatment of polyether polyol. In the post-processing process of polyether polyol refining, when a weak acid wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/30
CPCC08G65/30
Inventor 刘沂郭辉张涛
Owner SHANDONG BLUSR DONGDA CHEM