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

A kind of separation process of substituted benzaldehyde co-production product

A technology of benzaldehyde and tert-butyl benzoic acid, applied in the separation/purification of carboxylic acid compounds, separation/purification of carbonyl compounds, etc., can solve the problems of complicated separation process, simplify the separation process, avoid waste water, and avoid production Effect

Inactive Publication Date: 2015-11-11
NANJING UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The separation process of this process is complicated, and a considerable amount of high-concentration wastewater containing sodium sulfate is produced

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
  • A kind of separation process of substituted benzaldehyde co-production product
  • A kind of separation process of substituted benzaldehyde co-production product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In a 1000mL flask, add 675mL of p-tert-butyltoluene oxidation feed solution; rectify to remove acetic acid, add water twice to wash off the catalyst in total of 300mL.

[0015] The organic phase after water washing is transferred to a 1000mL three-neck flask with stirring and heating mantle heating, heated to 95°C, and 0.2MPa saturated water vapor is introduced for stripping, and the mixed steam after stripping is sent to the middle end of the fractionation column, and the fractionation column There is a fractionation column bottom bottle at the bottom, and the mixed steam is partially condensed in the fractionation column, and the condensate contacts the steam that continues to rise on the way down, and the two perform heat exchange, and the p-tert-butylbenzaldehyde and p-tert-butyltoluene with high boiling points in the vapor are absorbed Condensation, the water vapor with low boiling point still rises as steam, while the low boiling point components in the condensate ...

Embodiment 2

[0019] In a 1000mL flask, add 675mL of p-tert-butyltoluene oxidation feed solution; rectify to remove acetic acid, add water twice to wash off the catalyst in total of 300mL.

[0020] The organic phase after water washing was transferred to a 1000mL three-necked flask with stirring and heating mantle heating, heated to 95°C, and 0.2MPa nitrogen gas was introduced for stripping, and the mixed steam after stripping was sent to the middle end of the fractionation column. In the bottom bottle of the fractionating column, the mixed vapor is partially condensed in the fractionating column, and the condensate contacts the steam that continues to rise during the descent, and the two perform heat exchange, and p-tert-butylbenzaldehyde and p-tert-butyltoluene with high boiling points in the vapor are condensed, The nitrogen with low boiling point still rises as a vapor, while the low boiling point components in the condensate are heated and vaporized, and the high boiling point component...

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

PropertyMeasurementUnit
acid valueaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a separation process after synthesis of p-tertbutyl benzaldehyde (co-produced p-tertbutyl benzaldehyde). The separation process comprises the steps: rectifying an oxidization feed liquid to remove acetic acid, and washing with water to remove a catalyst; heating a washed organic phase to 95-100 DEG C, introducing saturated vapor or nitrogen, stripping, carrying out fractionation under reduced pressure, for separating vapor or nitrogen, p-tertbutyl benzaldehyde and p-tert-butyltoluene, cooling stripped residual liquid and then extracting by using methylbenzene, distilling the p-tertbutyl benzaldehyde after the methylbenzene is recovered, and then recrystallizing the methylbenzene. According to the separation process, the process step is reduced, and sodium sulfate-containing wastewater is prevented from producing.

Description

technical field [0001] The invention relates to a method for oxidizing substituted toluene and coproducing substituted benzaldehyde and substituted benzoic acid. Background technique [0002] Use p-tert-butyltoluene as raw material to synthesize p-tert-butylbenzaldehyde (co-production of p-tert-butylbenzoic acid), the process includes oxidation reaction, distillation to remove acetic acid, washing with water and alkali, separation of p-tert-butylbenzoic acid , rectification and separation of p-tert-butylbenzaldehyde and other steps. [0003] After a sufficient amount of p-tert-butyltoluene is acidified with acetic acid, a catalyst is added, and oxygen is passed through at a certain temperature for oxidation reaction to generate p-tert-butylbenzaldehyde and p-tert-butylbenzoic acid. The oxidized feed solution is distilled to remove acetic acid, washed to remove the catalyst, and then washed with sodium carbonate alkali to separate the generated p-tert-butylbenzoic acid into ...

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 Patents(China)
IPC IPC(8): C07C47/542C07C45/78C07C45/82C07C63/04C07C51/42C07C51/44
Inventor 赵玉明王利超马堂文
Owner NANJING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com