Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation of dihydroxy-benzene

A technology for dihydroxybenzene and diisopropylbenzene oxidation, which is applied in the field of preparation of dihydroxybenzene and can solve problems such as insufficient purification

Inactive Publication Date: 2003-01-15
SUMITOMO CHEM CO LTD
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, said method has a problem in that the purification by liquid separation is insufficient, and thus requires the use of an additive to enhance the separability of the liquid

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
  • Preparation of dihydroxy-benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Embodiment 1

[0023] The m-diisopropylbenzene is oxidized to obtain a reaction mixture containing m-bis(2-hydroperoxy-2-propyl)benzene (step (1)); the m-di(2-hydroperoxy) in the reaction mixture is decomposed Oxy-2-propyl)benzene to obtain a mixture containing crude resorcinol (step 2). It was determined that the mixture containing crude resorcinol contained 10% by weight of resorcinol, 10% by weight of acetone, 0.5% by weight of m-isopropenylphenol, and 70% by weight of methyl isobutyl ketone.

[0024] Using a distillation column, under the condition of -91-0KpaG, distilling 23 parts by weight of the mixture containing crude resorcinol to obtain 20 parts by weight of a fraction containing 11% by weight of acetone from the low boiling point portion, And 2.5 parts by weight of the fraction from the high boiling point portion containing 92% by weight of resorcinol, 1-5% by weight of m-isopropenylphenol, and 6% by weight of a heavy substance (step (3)).

[0025] Using a rectification tower, under ...

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

Provided is a process for producing dihydroxybenzene, which comprises the steps of:(1) oxidizing diisopropylbenzene to obtain a reaction mixture containing di(2-dihydroperoxy-2-propyl)benzene;(2) cleaving di(2-dihydroperoxy-2-propyl)benzene in the reaction mixture to obtain a mixture containing crude dihydroxybenzene;(3) distilling the mixture containing crude dihydroxybenzene to obtain a fraction containing acetone from a low boiling side, and a fraction containing dihydroxybenzene from a high boiling side;(4) distilling the fraction containing dihydroxybenzene obtained in the above-mentioned step (3) to obtain a fraction containing dihydroxybenzene from a low boiling side, and a fraction containing heavy material from a high boiling side; and(5) mixing the fraction containing dihydroxybenzene obtained in the above-mentioned step (4) with water, and contacting the resulting mixture with an extraction solvent, followed by separating into an aqueous layer containing dihydroxybenzene and an oily layer containing impurity.

Description

Technical field [0001] The invention relates to a method for preparing dihydroxybenzene. More specifically, the present invention relates to a method for the preparation of pure dihydroxybenzene, which is superior from the point of view of operation, because the method does not have a solid processing step, and there is no need to use anything in the extraction step. Additives to improve the separability of liquids. Background technique [0002] For example, JP-A 64-38 discloses a method for preparing dihydroxybenzene, which includes the following steps: [0003] (1) Oxidizing diisopropylbenzene to obtain a reaction mixture containing bis(2-hydroperoxy-2-propyl)benzene; [0004] (2) Decomposing the bis(2-hydroperoxy-2-propyl)benzene in the reaction mixture to obtain a mixture containing crude dihydroxybenzene; and [0005] (3) Obtain pure dihydroxybenzene from a mixture containing crude dihydroxybenzene. [0006] However, the method described has a problem in that the purificatio...

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
IPC IPC(8): C07C37/72C07C37/74C07C39/08C07C409/12
CPCC07C39/08C07C407/00C07C409/12
Inventor 德增重文
Owner SUMITOMO CHEM CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com