Supercharge Your Innovation With Domain-Expert AI Agents!

Process of preparing 1,4-cyclohexane dimethand

A technology of cyclohexanedimethanol and terephthalic acid, which is applied in 1 field and can solve the problems of expensive precious metals, increased catalyst consumption, and high catalyst cost

Inactive Publication Date: 2007-11-07
EAST CHINA UNIV OF SCI & TECH
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, in the existing one-step hydrogenation technology using terephthalic acid as the starting material, all those using a single catalyst have the disadvantage of requiring expensive noble metals, the cost of the catalyst is relatively high, and not all of them can achieve high target product yield
If the combination of different catalysts is used, the preparation process of the catalyst is more complicated, and the amount of catalyst is also increased.

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
  • Process of preparing 1,4-cyclohexane dimethand
  • Process of preparing 1,4-cyclohexane dimethand

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] In the method for preparing 1,4-cyclohexanedimethanol of the present invention, the main steps are: mixing terephthalic acid and water-containing medium at a weight ratio of 1: (5-20), and in the presence of a catalyst Hydrogenation is carried out by introducing hydrogen gas. The reaction temperature is 100°C to 300°C (preferably, the reaction temperature is 150°C to 250°C), the hydrogen pressure is 4.0 MPa to 10.0 MPa (preferably, the hydrogen pressure is 6 MPa to 10 MPa), and the reaction time is 3 hours to 6 hours.

[0015] Wherein, the catalyst is a supported catalyst, and its active components include Ru, Sn and B, and the content of Ru is 3wt%-10wt% (based on the weight of the carrier used), and the molar ratio of Ru to Sn is 0.8-2.0 , The molar ratio of B to the sum of the moles of Ru and Sn is 3-10; the carrier of the catalyst is Al 2 O 3 The average particle size is preferably 80-200 mesh; based on the total weight of the reaction system, the weight dosage of the c...

Embodiment 1～10

[0022] Place 150 g of solvent water and the required amount of terephthalic acid in a 300 ml autoclave, and add the required amount of catalyst in proportion. After the autoclave is sealed, the air in the autoclave is drawn out, and then hydrogen is introduced for replacement. Then hydrogen gas is passed through with stirring and heating, and the reaction is carried out according to preset conditions, and the hydrogen pressure is maintained until the reaction is completed. After cooling, the pressure is released and the catalyst is filtered out. The reaction liquid was analyzed by gas chromatography, and the product concentration was calculated according to the internal standard method. The acid value determination method is used to calculate the concentration of unreacted terephthalic acid.

[0023] The catalyst composition and amount, reaction conditions and reaction results used in each embodiment are shown in Table 1.

[0024]

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 process of preparing 1, 4-cyclohexane dimethanol. The preparation process includes the following main step: the reaction between terephthalic acid as the initial material and hydrogen are reacted in the presence of supported catalyst with active components metal Ru, metal Sn and non-metal B, so as to obtain the target product. The present invention has lowered 1, 4-cyclohexane dimethanol preparing cost and mild reaction condition.

Description

Technical field [0001] The invention relates to a method for preparing 1,4-cyclohexanedimethanol, in particular, to a method for preparing 1,4-cyclohexane by using terephthalic acid as a starting material through a one-step catalytic hydrogenation reaction Dimethanol method. Background technique [0002] So far, a variety of methods for preparing 1,4-cyclohexanedimethanol have been reported. Among them, terephthalic acid is used as the starting material to obtain 1,4-cyclohexanedimethanol through a one-step catalytic hydrogenation reaction. The methods are: [0003] US 6,495,730 discloses a method for preparing 1,4-cyclohexanedimethanol by one-step hydrogenation of terephthalic acid in liquid phase. A supported 5.0% Ru-3.5% Sn-5.6% Re / C catalyst is selected. After reacting at 250°C and a hydrogen pressure of 15Mpa for 5 hours, the conversion of terephthalic acid and the yield of 1,4-cyclohexanedimethanol reached 97% and 42%, respectively. [0004] JP 2000007596 describes a method...

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): C07C31/27C07C29/149B01J23/62
Inventor 朱志庆万强吕自红宋义伟
Owner EAST CHINA UNIV OF SCI & TECH
Features
  • R&D
  • 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