Clean esterification method for producing bialkyl ortho phthalate

A dialkyl phthalate, esterification technology, applied in chemical instruments and methods, carboxylate preparation, organic chemistry and other directions, can solve the problems of difficult separation and recovery, equipment corrosion, low selectivity, etc., to achieve separation The effect of easy process, high esterification ability and low reaction temperature

Inactive Publication Date: 2007-01-31
QINGDAO UNIV OF SCI & TECH
View PDF2 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional industrial application of acid-catalyzed processes, sulfuric acid has the advantages of high activity, low use temperature, and easy production; but low selectivity, poor product quality, corrosion of equipment and pollution of the environment
The non-acid catalyzed process (JP 1985-54945, EP 405332), which is represented by titanates,

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
  • Clean esterification method for producing bialkyl ortho phthalate
  • Clean esterification method for producing bialkyl ortho phthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 6g of ionic liquid 1-methyl-3-(propyl-3-sulfonic acid)imidazolium fluoroborate, 5.7g of phthalic anhydride, 10g of isooctyl alcohol and an appropriate amount of water-carrying agent into the reaction flask, Stirring and heating, the esterification temperature is 110-125°C, and react for 1.5 hours. After the reaction solution is allowed to stand and separate into layers, the upper reaction solution is poured out and purified by distillation. The conversion rate of phthalic anhydride is 98.1%, and the selectivity is 98.6%.

Embodiment 2

[0024] Put 2g of ionic liquid 1-methyl-3-(propyl-3-sulfonic acid) imidazole hydrogen sulfate, 5.7g of phthalic anhydride, 12.5g of n-octanol and an appropriate amount of water-carrying agent into the reaction flask, Stirring and heating, the esterification temperature is 110-130°C, and react for 2 hours. After the reaction solution is allowed to stand and separate into layers, the upper reaction solution is poured out and purified by distillation. The conversion rate of phthalic anhydride is 97.2%, and the selectivity is 98.5%.

Embodiment 3

[0026] Put 20g of ionic liquid 1-methyl-3-(propyl-3-sulfonic acid)imidazole p-toluenesulfonate, 5.7g of phthalic anhydride, 15g of isooctyl alcohol and an appropriate amount of water-carrying agent into the reaction flask , stirred, heated, the esterification temperature was 100-125°C, and reacted for 2 hours. After the reaction solution was allowed to stand and separate, the upper reaction solution was poured out and purified by distillation. The conversion rate of phthalic anhydride was 98.2%, and the selectivity was 99.1%.

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

The present invention relates to a clean esterification method for producing dialkyl phthalate. It is characterized by that it adopts the ionic liquid formed from sulfonic acid group functionalized alkyl pyridine cation or sulfonic acid group functionalized 1,3-dialkyl iminazol cation or 2-oxopyrrolidine cation and organic or inorganic anion X as catalyst of reaction and reaction medium; at normal pressure its reaction temperature is 90-130deg.C and reaction time is 1-2hr, it can catalyze the esterification reaction of phthalic anhydride and isooctanol or n-octanol so as to obtain the invented dialkyl phthalate.

Description

technical field [0001] The invention relates to an organic synthesis method, in particular to a clean esterification method for producing dialkyl phthalates. technical background [0002] Dialkyl phthalate plasticizers are currently the most widely used plasticizers in plastic processing. They have low volatility, high plasticizing efficiency, low miscibility with water, and good electrical properties. With the advantages of softness and excellent comprehensive processing performance, it has become a general-purpose plasticizer with the largest production and consumption. Among them, dioctyl phthalate (hereinafter referred to as DOP) has the best overall performance and is most widely used. The synthetic methods of dialkyl phthalates, taking DOP as an example, include liquid-phase acid-catalyzed esterification, non-acid-catalyzed, catalyst-free and solid superacid-catalyzed methods. In the traditional industrial application of acid-catalyzed processes, sulfuric acid has th...

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): C07C67/08C07C69/80B01J31/02
Inventor 于世涛刘福胜李红亮解从霞
Owner QINGDAO UNIV OF SCI & TECH
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