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Oxygen-containing polydentate ligand modified copper-based catalyst for acetylene hydrochlorination reaction as well as preparation method and application thereof

A technology of acetylene hydrochlorination and copper-based catalysts, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor stability and low activity, To achieve the effect of enhancing the activity

Active Publication Date: 2021-06-08
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the common problems of low activity and poor stability of copper-based catalysts, we have found through a large number of experiments and researches that oxygen-containing multidentate ligands can make high-valent copper active species more stable and reduce the zero-valence of reduction products in the catalytic process. copper production

Method used

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  • Oxygen-containing polydentate ligand modified copper-based catalyst for acetylene hydrochlorination reaction as well as preparation method and application thereof
  • Oxygen-containing polydentate ligand modified copper-based catalyst for acetylene hydrochlorination reaction as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0041] (1) At 50° C., 1.7 g of anhydrous copper chloride and 0.61 g of methyl pyruvate were stirred and dissolved in 5.5 g of absolute ethanol to obtain an impregnation solution containing copper ions and ligands;

[0042](2) Immerse the impregnating solution onto 10 g of activated carbon by equal-volume impregnation method, and leave it sealed at 50° C. for 1 hour;

[0043] (3) Dry the activated carbon at 95° C. for 20 hours to obtain catalyst A1.

[0044] A1 The reaction condition is 130°C, the acetylene space velocity is 40h -1 , when the volume ratio of hydrogen chloride to acetylene is 1.2:1, the conversion rate of acetylene is 84.5%.

Embodiment 2

[0051] (1) At 50° C., 1.7 g of anhydrous copper chloride and 0.54 g of lactic acid were stirred and dissolved in 5.5 g of N, N-dimethylformamide to obtain an impregnation solution containing copper ions and ligands;

[0052] (2) Immerse the impregnating solution onto 10 g of activated carbon by equal-volume impregnation method, and leave it sealed at 50° C. for 1 hour;

[0053] (3) Dry the activated carbon at 170° C. for 20 hours to obtain catalyst A3.

[0054] A3 The reaction condition is 130°C, and the space velocity of acetylene is 40h -1 , when the volume ratio of hydrogen chloride to acetylene is 1.2:1, the conversion rate of acetylene is 87.1%.

Embodiment 3

[0056] (1) At 50° C., 1.7 g of anhydrous copper chloride and 0.61 g of methyl pyruvate were stirred and dissolved in 5.5 g of N, N-dimethylformamide to obtain an impregnation solution containing copper ions and ligands;

[0057] (2) Immerse the impregnating solution onto 10 g of activated carbon by equal-volume impregnation method, and leave it sealed at 50° C. for 1 hour;

[0058] (3) Dry the activated carbon at 170° C. for 20 hours to obtain catalyst A4.

[0059] A4 The reaction condition is 130°C and the space velocity of acetylene is 40h -1 , when the volume ratio of hydrogen chloride to acetylene is 1.2:1, the conversion rate of acetylene is 86.9%.

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Abstract

The invention relates to an oxygen-containing polydentate ligand modified copper-based catalyst for acetylene hydrochlorination reaction as well as a preparation method and application thereof. According to the catalyst, activated carbon serves as a carrier, copper salt serves as a main active component, and the catalytic activity and stability of the catalyst are improved by adding an oxygen-containing polydentate ligand. The oxygen-containing polydentate ligand does not contain other hetero-atoms except oxygen, and can form a stable complex with copper; the copper salt is selected from one or more of copper chloride, copper bromide, copper nitrate and copper sulfate; and the mass ratio of the copper element to the catalyst is 2.5-16%. The copper ions can be firmly combined with the oxygen-containing polydentate ligand, so that the copper ions are prevented from being reduced into inactive zero-valent copper in the catalytic process. In addition, if the two can form a five-membered ring complex after coordination, the electrons of the copper ions can be regulated and controlled to tend to space distribution which is more favorable for catalysis.

Description

technical field [0001] The invention belongs to the field of chemical catalysis, and in particular relates to a copper-based catalyst modified by an oxygen-containing multi-dentate ligand for acetylene hydrochlorination, a preparation method and application thereof. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose resins in the world, and is widely used in many industries such as chemical industry, building materials, agriculture and medical equipment. In 2018, China's total PVC production capacity exceeded 24 million tons, accounting for more than 40% of the global PVC production capacity. It is estimated that by 2026, the total global PVC demand is expected to reach 56.2 million tons. The production of polyvinyl chloride (PVC) requires vinyl chloride monomer (VCM). In view of my country's special energy structure of "rich coal, poor oil, and little gas", my country chooses mature technology, less water consumption, and low producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C07C17/08C07C21/06
CPCB01J31/2213C07C17/08B01J2531/16C07C21/06
Inventor 李伟王佰全冯昕妍韩冲
Owner NANKAI UNIV
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