Process for production of propyline oxide

a technology of propylene oxide and propylene oxide, which is applied in the direction of chemical apparatus and processes, chemical production of bulk chemicals, organic chemistry, etc., can solve the problems of selectively obtaining only propylene oxide and unsatisfactory processing, and achieve the effect of maintaining the life of catalysts for a long tim

Inactive Publication Date: 2005-04-21
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented method is to produce propylene oxide with superior properties over existing methods such as reacting ethylene with chlorine gas or peroxy acid under specific conditions. This results in high yields of product while reducing environmental concerns associated with these chemical reactions.

Problems solved by technology

The technical problem addressed in this patent is finding a way to efficiently produce propylene oxide without producing unwanted side products such as styrene or other compounds that are necessary during the production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] A cumene solution containing 25% by weight of cumyl alcohol was passed together with hydrogen through a reactor in which a copper-chromium catalyst was packed to react them. In this case, the total concentration of formic acid and acetic acid in the cumene solution was 10 ppm by weight. A molar ratio of hydrogen to cumyl alcohol of 8, LHSV of cumene of 1.5 hour−1, and reaction pressure of 1 MPa-G(gauge pressure) were adopted. Only cumene was produced in the reaction of cumyl alcohol. The result is shown in Table 1.

example 2

[0023] It was carried out in the same manner as in Example 1 except that the total concentration of formic acid and acetic acid in the cumene solution was 40 ppm by weight. The result is shown in Table 1.

example 3

[0024] It was carried out in the same manner as in Example 1 except that the total concentration of formic acid and acetic acid in the cumene solution was 100 ppm by weight. The result is shown in Table 1.

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Abstract

A process for producing propylene oxide, comprising the following steps: oxidation step: a step of obtaining cumene hydroperoxide by oxidizing cumene; epoxidation step: a step of obtaining propylene oxide and cumyl alcohol by reacting a cumene solution containing cumene hydroperoxide with an excess of propylene in a liquid phase in the presence of a solid catalyst; and hydrogenolysis step: a step of obtaining cumene through hydrogenolysis of cumyl alcohol obtained in the epoxidation step, and recycling the cumene to the oxidation step as the raw material of the oxidation step, wherein the concentration of organic acids in cumyl alcohol supplied to the hydrogenolysis step is adjusted to 200 ppm by weight or less.

Description

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Claims

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Application Information

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Owner SUMITOMO CHEM CO LTD
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