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Method for electrocatalytically and selectively reducing alkyne impurities in olefin

A selective and electrocatalytic technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of poor alkyne conversion rate and selectivity, no commercial feasibility, low solubility of olefins, etc., to achieve low cost, Excellent product selectivity, the effect of improving the conversion rate

Pending Publication Date: 2021-02-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the extremely low solubility of alkenes in the electrolyte and the extremely poor conversion rate and selectivity of alkynes, the current electrochemical selective reduction of alkynes has great disadvantages compared with traditional thermal catalytic technologies, and is not commercialized. Feasibility has not been valued by relevant basic research and technical personnel

Method used

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  • Method for electrocatalytically and selectively reducing alkyne impurities in olefin
  • Method for electrocatalytically and selectively reducing alkyne impurities in olefin
  • Method for electrocatalytically and selectively reducing alkyne impurities in olefin

Examples

Experimental program
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Effect test

Embodiment 1

[0057] (1) The gas diffusion electrode made of Fe nanoparticles is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; both the catholyte and the anolyte are 1M KOH solution, and an anion is used between exchange membrane isolation, and as figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0058] (2) Use a gas mass flowmeter to control the flow rate of the acetylene-ethylene mixed reaction gas to 50 sccm.

[0059] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0060] (4) The catalytic activity of Fe nanoparticles was characterized by potentiostatic method.

[0061] The catalyst composition and specific evaluation results are shown in Table 1.

Embodiment 2

[0063] (1) The gas diffusion electrode made of Au nanoparticles is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; both the catholyte and the anolyte are 0.5M H 2 SO 4 solution, separated by a proton exchange membrane, and as figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0064] (2) Use a gas mass flowmeter to control the flow rate of the acetylene-ethylene mixed reaction gas to 50 sccm.

[0065] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0066] (4) The catalytic activity of Au nanoparticles was characterized by potentiostatic method.

[0067] The catalyst composition and specific evaluation results are shown in Table 1.

Embodiment 3

[0069] (1) The gas diffusion electrode made of Ag nanoparticles is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; both the catholyte and the anolyte are 1M KOH solution, and an anion is used between exchange membrane isolation, and as figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0070] (2) Use a gas mass flowmeter to control the flow rate of the acetylene-ethylene mixed reaction gas to 50 sccm.

[0071] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0072] (4) The catalytic activity of Ag nanoparticles was characterized by potentiostatic method.

[0073] The catalyst composition and specific evaluation results are shown in Table 1.

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Abstract

The invention relates to a method for electrocatalytically and selectively reducing alkyne impurities in olefin, particularly to electrocatalytical and selective hydrogenation of acetylene, propargyl,butyne, phenylacetylene and the like. According to the invention, a gas diffusion electrode electrolytic tank is adopted, a catalyst is sprayed on a gas diffusion layer substrate (including conductive carbon paper and metal) to prepare a gas diffusion electrode, a cathode and an anode are isolated by an ion exchange membrane, and a three-electrode or two-electrode system constant voltage method is adopted to carry out electrochemical performance test, wherein the reaction gas olefin contains 1% of alkyne impurities; experimental results show that the residual concentration of olefin can be reduced to 5 ppm or below by regulating and controlling a proper voltage range; and compared with a traditional thermal catalysis technology, the method of the invention can selectively reduce alkyne impurities in olefin into olefin at normal temperature and normal pressure without hydrogen consumption, can greatly reduce energy consumption and potential risks in the process, better meets the requirements of green chemical engineering, and has great strategic significance.

Description

technical field [0001] The invention belongs to the electrocatalytic selective hydrogenation technology of acetylene, propyne, butyne and phenylacetylene, etc., and relates to a method for electrocatalytic selective reduction of alkyne impurities in alkenes. The method utilizes the three-phase reaction characteristics of gas diffusion electrodes , the continuous selective reduction of alkyne impurities in industrial olefin gas streams has greatly improved the conversion of alkyne and the selectivity of target olefin products, and has great practical application prospects. Background technique [0002] The olefin fraction produced in the steam cracking process of petroleum hydrocarbons often contains a small amount of impurities such as alkynes, and their presence will seriously poison the catalysts used in the homogeneous polymerization and copolymerization processes in the subsequent stages. For example, according to the requirements of processing procedures such as polyole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/25C25B3/03C25B11/052C25B11/032
Inventor 张健卜军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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