A process for the preparation of 1,2-pentanediol, co-producing 2,3-epoxypentane, 2,3-epoxy-2-methylbutane, 1,2-epoxy-2-methylbutane

By using HMS-structured titanium-silicon molecular sieves and cumene hydroperoxide to catalyze the cracking of ethylene raffinate C5, combined with distillation and alkali-catalyzed hydrolysis, the problems of high raw material cost and difficult separation in the synthesis of 1,2-pentanediol were solved, achieving efficient and economical preparation of epoxy compounds and production of 1,2-pentanediol.

CN122255084APending Publication Date: 2026-06-23CHINA PETROLEUM & CHEMICAL CORP +1
View PDF 6 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-19
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing technologies for synthesizing 1,2-pentanediol suffer from high raw material costs, significant safety hazards, complex processes, and uneconomical practices. In particular, they have low utilization rates of residual C5 from cracked ethylene and are difficult to effectively separate 1,2-epoxypentane and 2,3-epoxypentane.

Method used

Using HMS-structured titanium-silicon molecular sieves as catalysts and cumene hydroperoxide as oxidant, and taking raffinate C5 from cracked ethylene as raw material, 1,2-pentanediol was prepared by catalytic epoxidation and distillation separation, combined with alkaline catalytic hydrolysis, and 2,3-epoxypentane, 2,3-epoxy-2-methylbutane, and 1,2-epoxy-2-methylbutane were produced.

Benefits of technology

It improved the yield of 1,2-pentanediol and the yield of epoxides, reduced raw material costs, achieved a green and environmentally friendly process, enhanced the comprehensive utilization value of C5 resources, and simplified the process flow.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122255084A_ABST
    Figure CN122255084A_ABST
Patent Text Reader

Abstract

A method for preparing 1,2-pentanediol and co-producing 2,3-epoxypentane, 2,3-epoxy-2-methylbutane, and 1,2-epoxy-2-methylbutane involves using the residual C5 from cracked ethylene as the reactant, an organic peroxide as the oxidant, and a titanium-silicon molecular sieve as the catalyst to undergo a catalytic oxidation reaction. The resulting reaction products are then separated by distillation. The residual C5 component is collected at the top of a first distillation column, and the bottom product is transferred to a second distillation column. Epoxyalkane is collected at the top of the second distillation column. The collected epoxyalkane is transferred to a third distillation column, where 1,2-epoxy-2-methylbutane and 2,3-epoxy-2-methylbutane are collected at the top, and 2,3-epoxypentane and 1,2-epoxypentane are collected at the bottom. The bottom product of the third distillation column is then subjected to an alkaline hydrolysis reaction. The mixture obtained from the alkaline hydrolysis reaction is further distilled to separate 1,2-pentanediol and 2,3-epoxypentane. This invention provides a green and environmentally friendly method for the high-value utilization of C5 residue from cracked ethylene.
Need to check novelty before this filing date? Find Prior Art