Oxidation of hydrocarbons to acids in the presence of fluoro compounds

A technology of fluorine compounds and mixtures, applied in the field of dibasic acids, can solve the problem of unnoticed importance

Inactive Publication Date: 2002-03-06
RPC INC
View PDF60 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far little attention has been paid to the importance of these two phases, other than the separation of adipic acid from the "polar phase" and the partial or complete recycling of these phases to the reactor with or without further treatment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Oxidation of hydrocarbons to acids in the presence of fluoro compounds
  • Oxidation of hydrocarbons to acids in the presence of fluoro compounds
  • Oxidation of hydrocarbons to acids in the presence of fluoro compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] As stated above, the present invention relates to a process for the preparation of dibasic acids by oxidizing a hydrocarbon with a gas containing an oxidizing agent, preferably oxygen.

[0046] The inventors found that during the oxidation of hydrocarbons such as cyclohexane and xylene to form the corresponding dibasic acids in the presence of a cobalt catalyst, adding a critical amount of fluorine compounds to the reaction mixture can increase the reaction rate without compromising selectivity, yield and / or response control.

[0047] Despite the practical importance of continuous systems for the production of dibasic acids compared to batch reactors, the inventors have found that microreactors can be used to determine the limits within which continuous systems operating under steady conditions can be advantageously utilized Fluorine compounds.

[0048] Two critical parameters relate to the aforementioned limits and were determined with the microreactor described below...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

This invention relates to methods of oxidizing hydrocarbons, such as cyclohexane, o-xylene, m-xylene, and p-xylene, to form a respective acid, such as adipic acid, phthalic acid, isophthalic acid, and terephthalic acid, for example, by introducing into the reaction mixture small critical amounts of fluorocompounds. Preferable fluorocompounds are perfluoroacids, such as for example perfluoroacetic acid, perfluorobutyric acid, and perfluorooctanoic acid. By introducing the critical amounts of the fluorocompounds, the reactivity increases without sacrificing yield and / or selectivity.

Description

technical field [0001] The present invention relates to the preparation of intermediate oxidation products, in particular by oxidation of compounds selected from cyclohexane, o-xylene, m-xylene, p-xylene and mixtures thereof under controlled conditions in the presence of a small critical amount of a fluorine compound co-solvent. It is the method of dibasic acid. Background of the invention [0002] There is a large body of references (patents and authored papers) dealing with the formation of intermediate oxidation products such as dibasic acids by oxidation of hydrocarbons, the most important one being adipic acid. Adipic acid is used to make nylon 66 fibers and resins, polyesters, polyurethanes, and a variety of other compounds. Examples of other intermediate oxidation products include, but are not limited to, cyclohexanol, cyclohexanone, cyclohexyl hydroperoxide, benzoic acid, terephthalic acid, isophthalic acid, phthalic acid, and the like. [0003] Different methods e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/215C07B61/00C07C51/31C07C55/14
CPCC07C51/313C07C55/14C07C51/31
Inventor D·C·德考斯特M·W·达赛尔E·瓦赛里欧
Owner RPC INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap