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

Method for refining tri-n-hexyl trimellitate and used refining agent thereof

A technology of tri-n-hexyl trimellitate and trimellitic acid, which is applied in the field of organic compound preparation, can solve problems such as unfavorable economic benefits, difficulty in reducing costs, and low production efficiency, so as to reduce production costs, improve production efficiency, and operate convenient effect

Inactive Publication Date: 2012-01-18
TIANJIN CHEM REAGENT RES INST
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual production method of tri-n-hexyl trimellitate is direct esterification, and the color of the obtained product is yellow, which is difficult to sell as a product and must be further refined, that is, to carry out a decompression refining treatment step. The problems in this type of preparation method: 1. Since the decompression refining treatment step requires the use of expensive high vacuum pumps, this method has the problems of a large number of production equipment and high costs, making it difficult to reduce costs
2. Since the decompression refining treatment step is an indispensable and time-consuming production step in the process of producing tri-n-hexyl trimellitate, the method has the problems of long production time and low production efficiency, which is not conducive to the economic benefits of enterprises improvement

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of refined preparation: mix (100) g calcium oxide, (100) g magnesium oxide, (200) g activated carbon, and (100) g silicon dioxide evenly.

[0019] (1) Esterification step: drop into successively 100 kilograms of trimellitic acid, 256 kilograms of n-hexanols, 0.3 kilograms of concentrated sulfuric acid in a 500-liter reactor with a heating device, electric stirring, thermometer water circulation condenser and vacuum oil-water separator. Kilogram, under stirring, slight vacuum, heating to boiling reaction at the same time, keep boiling reflux state, continuously separate water from the oil-water separator, until no water is generated, stop heating, and the esterification reaction is terminated.

[0020] (2) Water washing step: add 250 kilograms of water to the mixed solution obtained after the esterification reaction, stir evenly, leave to stand for stratification, and remove the water layer therein.

[0021] (3) Dealcoholization step: dealcoholizing the washe...

Embodiment 2

[0025] Preparation of refined preparation: (120) g calcium oxide, (120) g magnesium oxide, (240) g gac, (120) g silicon dioxide are mixed evenly.

[0026] (1) Esterification reaction step: drop into successively 100 kilograms of trimellitic acid, 256 kilograms of n-hexanols, 0.3 kilograms of concentrated sulfuric acid in a 500-liter reactor with a heating device, electric stirring, thermometer water circulation condenser and vacuum oil-water separator. Kilogram, under stirring, slight vacuum, heating to boiling reaction at the same time, keep boiling reflux state, continuously separate water from the oil-water separator, until no water is generated, stop heating, and the esterification reaction is terminated.

[0027] (2) Water washing step: add 250 kilograms of water to the mixed solution obtained after the esterification reaction, stir evenly, leave to stand for stratification, and remove the water layer therein.

[0028] (3) Dealcoholization step: dealcoholizing the washed ...

Embodiment 3

[0032] Preparation of refined preparation: (140) g calcium oxide, (140) g magnesium oxide, (280) g gac, (140) g silicon dioxide are mixed evenly.

[0033] (1) Esterification reaction step: drop into successively 100 kilograms of trimellitic acid, 256 kilograms of n-hexanols, 0.3 kilograms of concentrated sulfuric acid in a 500-liter reactor with a heating device, electric stirring, thermometer water circulation condenser and vacuum oil-water separator. Kilogram, under stirring, slight vacuum, heating to boiling reaction at the same time, keep boiling reflux state, continuously separate water from the oil-water separator, until no water is generated, stop heating, and the esterification reaction is terminated.

[0034] (2) Water washing step: add 50 kilograms of water to the mixed solution obtained after the esterification reaction, stir evenly, leave to stand for stratification, and remove the water layer therein.

[0035] (3) Dealcoholization step: dealcoholizing the washed m...

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 invention relates to a method for refining tri-n-hexyl trimellitate and a used refining agent thereof. The refining agent comprises the following components in the following mass ratio: calcium oxide: magnesia: active carbon: silicon dioxide=1:1:2:1. The method for preparing the tri-n-hexyl trimellitate comprises the following refining steps of: adopting the refining agent, adding the refining agent to a crude product of the tri-n-hexyl trimellitate with the mass ratio of the refining agent to trimellitic acid being 0.05-0.1:1, stirring and refining for one hour, and filtering refined mixed liquid to obtain a finished product of the tri-n-hexyl trimellitate. A high-vacuum refining step is omitted in the preparation method during production, thereby the input of high-vacuum pump equipment is avoided, so that the investment of the equipment is saved, the production cost is lowered, and the market competitiveness of the product is improved.

Description

technology field; [0001] The invention belongs to the field of organic compound preparation, in particular to a method for refining tri-n-hexyl trimellitate and a used refining preparation thereof. Background technique; [0002] In industrial production, plastic industry and military production, tri-n-hexyl trimellitate is used more and more widely as an important organic compound and heat-resistant, high-temperature-resistant plasticizer with good electrical properties. The usual production method of tri-n-hexyl trimellitate is direct esterification, and the color of the obtained product is yellow, which is difficult to sell as a product and must be further refined, that is, to carry out a decompression refining treatment step. The problems in this type of preparation method: 1. Since an expensive high-vacuum pump needs to be used in the decompression refining treatment step, this method has the problems of a large number of production equipment and high costs, making it di...

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): C07C69/76C07C67/56
Inventor 张富强
Owner TIANJIN CHEM REAGENT RES INST
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