Process for the preparation of high purity isopropanol

By adding a purification step during the isopropanol refining process, the acetone concentration in the crude isopropanol is reduced, solving the problems of high energy consumption and low yield in the distillation column, and achieving efficient preparation of high-purity isopropanol.

CN117924024BActive Publication Date: 2026-07-24CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2022-10-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In the existing technology, the distillation column in the isopropanol refining process has a high theoretical plate number, high energy consumption, low distillation yield, and excessively high content of organic impurities such as acetone, which cannot meet the cleanliness requirements of high-end wafer manufacturing.

Method used

A purification step is added to the crude isopropanol refining unit. The acetone concentration in the crude isopropanol is reduced to below 100 ppm by mixing with active reagents and distillation. This reduces the requirements for the height of the distillation column and the number of theoretical plates. High-purity isopropanol is obtained by vacuum distillation.

Benefits of technology

It reduces energy consumption and improves the distillation yield and purity of isopropanol, meeting the cleanliness requirements of high-end wafer manufacturing.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the field of isopropyl alcohol preparation, and discloses a preparation method of high-purity isopropyl alcohol, which comprises the following steps: carrying out hydrogenation reaction on acetone raw material in the presence of a hydrogenation catalyst to obtain crude isopropyl alcohol, and then carrying out dehydration treatment and vacuum distillation on the crude isopropyl alcohol to obtain high-purity isopropyl alcohol; wherein, the method further comprises purification treatment of the crude isopropyl alcohol before the vacuum distillation; after the purification treatment, the concentration of acetone in the crude isopropyl alcohol is not higher than 100 ppm. The method reduces the requirements for the tower height and the number of theoretical plates of the rectification light-removing tower in the purification of the crude isopropyl alcohol, greatly reduces the energy consumption, and greatly reduces the light-removing loss of isopropyl alcohol.
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Citation Information

Patent Citations

  • Preparation method for high-purity isopropyl alcohol

    CN102898275A

  • Method for producing isopropanol by acetone hydrogenation

    CN102690172A

  • Purification method of isopropanol

    CN112142563A

  • Purifying acetone

    FR2082148A5