A process for the preparation of a low-aldehyde polyether polyol

By combining aminosilane-modified adsorbents with silicate adsorbents during the purification process of polyether polyols, chemical and physical adsorption of aldehydes was achieved, solving the problem of difficulty in reducing aldehyde content and odor in existing technologies, and producing polyether polyols with ultra-low aldehyde content.

CN122302253APending Publication Date: 2026-06-30CNOOC & SHELL PETROCHEMICAL CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNOOC & SHELL PETROCHEMICAL CO LTD
Filing Date
2026-05-08
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively reduce the aldehyde content and odor in polyether polyols, especially since propionaldehyde residue is relatively high. Existing methods, such as improving raw material quality, optimizing production processes, and purification methods, have limited effectiveness.

Method used

In the purification process of polyether polyols, an aminosilane-modified adsorbent is added. The aldehydes are adsorbed onto the solid adsorbent by the chemical adsorption reaction between amino and aldehyde groups, and then removed by filtration. Combined with the physical adsorption of silicate adsorbents, the aldehydes are completely removed.

Benefits of technology

Polyether polyols with ultra-low aldehyde content were prepared, with a total aldehyde content of ≤3ppm, especially a propionaldehyde content of ≤0.56ppm, which significantly reduced the aldehyde content and odor of the product, and improved the product purity and aldehyde removal efficiency.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure SMS_1
    Figure SMS_1
  • Figure SMS_2
    Figure SMS_2
  • Figure SMS_3
    Figure SMS_3
Patent Text Reader

Abstract

This invention provides a method for preparing a low-aldehyde polyether polyol. The method includes the following steps: adding crude polyether polyol to a reactor, adding water, then adding acid, then adding a silicate adsorbent, stirring, initiating dehydration, heating, and after a period of dehydration, adding an aminosilane-modified adsorbent, continuing adsorption and dehydration, and filtering to obtain the low-aldehyde polyether polyol; the aminosilane-modified adsorbent has primary amine groups. The preparation method provided by this invention uses an aminosilane-modified adsorbent in the purification process of crude polyether polyol, utilizing the chemical adsorption of aldehydes through the reaction of amino groups with aldehyde groups, and removing the aminosilane-modified adsorbent by filtration to obtain the low-aldehyde polyether polyol.
Need to check novelty before this filing date? Find Prior Art