Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for preparing dimethyl 1,4-cyclohexanedicarboxylate by ruthenium-rhenium bimetallic catalyzed hydrogenation of dimethyl terephthalate

A technology of dimethyl cyclohexanedicarboxylate and dimethyl phthalate, which is applied in the preparation of carboxylate, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of catalyst preparation The process is complicated and tedious, the reaction temperature is high, and it is unfavorable for industrial application. It achieves the effects of high practicability and economy, high catalytic efficiency and high selectivity.

Active Publication Date: 2021-02-26
DALIAN UNIV OF TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst preparation process is complex and cumbersome, which is not conducive to industrial application, and the reaction temperature in hydrogenation conditions is still high

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 method for preparing dimethyl 1,4-cyclohexanedicarboxylate by ruthenium-rhenium bimetallic catalyzed hydrogenation of dimethyl terephthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Preparation of 5% Ru / C, 5% Re / C catalysts by equal impregnation method. Weigh 0.1026gRuCl 3 , 0.0720gNH 4 ReO 4 Add 1.2ml of deionized water to dissolve, then add to 1g of activated carbon, mix evenly, soak at room temperature overnight, then dry, transfer to a blast drying oven for 4 hours at 110°C, and finally reduce under hydrogen at 460°C for 3 hours, That is, a 5% Ru / C, 5% Re / C catalyst is prepared.

Embodiment 2

[0015] Embodiment 2: Preparation of 5% Ru by equal impregnation method 0.83 Re 0.17 / C, 5% Ru 0.75 Re 0.25 / C, 5% Ru 0.5 Re 0.5 / C, 5% Ru 0.25 Re 0.75 / C, 5% Ru 0.17 Re 0.83 / C Catalyst. On the basis of the total metal loading of 5wt%, according to the Ru, Re metal molar ratio of 0.83:0.17, 0.75:0.25, 0.5:0.5, 0.25:0.75, 0.17:0.83 respectively weigh the required RuCl 3 and NH 4 ReO 4 Add 1.2ml of deionized water to dissolve, then add to 1g of activated carbon, mix well, soak overnight at room temperature, then dry, transfer to a blast drying oven for 4 hours at 110°C, and finally reduce under hydrogen at 460°C for 3 hours, that is 5% Ru 0.83 Re 0.17 / C, 5% Ru 0.75 Re 0.25 / C, 5% Ru 0.5 Re 0.5 / C, 5% Ru 0.25 Re 0.75 / C, 5% Ru 0.17 Re 0.83 / C Catalyst.

Embodiment 3

[0016] Embodiment 3: add 0.5g dimethyl terephthalate, 20g ethyl acetate, 0.125g5%Ru / C catalyst in reactor. After the reactor was sealed and ventilated, it was filled with 3MPa hydrogen and reacted at 70°C for 3 hours. After the reaction was completed, the samples were taken at room temperature, and sent to gas phase detection after centrifugal filtration and other treatments. The experimental results are shown in No. 1 in Table 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 invention provides a method for preparing 1,4-cyclohexanedicarboxylate by hydrogenation of dimethyl terephthalate catalyzed by a ruthenium-rhenium bimetallic catalyst. Under certain conditions, it is used for the technical process of preparing dimethyl 1,4-cyclohexanedicarboxylate by hydrogenating dimethyl terephthalate. At a reaction pressure of 2-5MPa, a reaction temperature of 30-120°C, and a reaction of 1-3 hours, the conversion rate of dimethyl terephthalate can reach 97.91%, and the target product 1,4-cyclohexanedicarboxylate The selectivity can reach 99.88%. It has the advantages of mild reaction conditions, high catalytic efficiency, simple catalyst preparation, etc., and has high practicability and economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous catalysis, and specifically relates to the preparation of a supported ruthenium-rhenium bimetallic catalyzed hydrogenation of dimethyl terephthalate to prepare dimethyl 1,4-cyclohexanedicarboxylate under relatively mild conditions. method. Background technique [0002] Dimethyl 1,4-cyclohexanedicarboxylate (DMCD) is an important chemical intermediate and can be used as a polymer modification material. It is also an intermediate product in the preparation of 1,4-cyclohexanedimethanol. 1,4-Cyclohexanedimethanol (CHDM) is a diol with high application value. It is also an excellent monomer for producing high value-added polyester materials. Compared with polyethylene terephthalate (PET), the polyester fiber produced by CHDM instead of ethylene glycol (EG) not only has lower density, higher melting point and other characteristics, but also has hydrolytic stability and insulating properties. A...

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): C07C69/75C07C67/303B01J23/656B01J37/02B01J37/18
CPCB01J23/6567B01J37/0201B01J37/18C07C67/303C07C2601/14C07C69/75
Inventor 梁长海曲恩慧陈霄李闯罗靖洁
Owner DALIAN UNIV OF TECH