Double metal cyanide catalyst for the production of polyether polyols and a process thereof

US11898007B2 · kind B2 · utility

Assignee

• COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH · IN

Inventors

• Umesh Kumar · Forest Park, US
• Akash Verma · Dehradun, IN
• Swati · Dehradun, IN
• Bhawna Sharma · Dehradun, IN
• Thangaraj Senthil Kumar · Dehradun, IN
• Sudip Kumar GANGULY · Dehradun, IN
• Anjan Ray · Dehradun, IN

Key dates

• Filing date: Feb 11, 2022
• Grant date: Feb 13, 2024
• Expiry date: Apr 25, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2650/22
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention discloses a Double Metal Cyanide (DMC) catalyst(s) useful for the production of polyether polyols (PEPO) and a less energy intensive room temperature method for the synthesis thereof. The catalyst(s) comprises of a DMC complex, an organic complexing agent, i.e., ethylenediaminetetraacetic acid (EDTA) and other co-complexing organic agents, e.g., t-BuOH, PEPO of composition ranging from about 1 to 10 wt %, wherein the average molecular weight of PEPO used ranged from 200 to 1000. A method of preparing a series of DMC catalyst(s) at room temperature with varying compositional ratios of the complexing and co-complexing agents targeting a wide range of PEPO of varying kinematic viscosity range is also disclosed. These DMC catalyst(s) are amorphous, highly active, and easily separable from product PEPO with recyclability/recoverability, making the product PEPO better industrially applicable and DMC catalyst more cost-effective.