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Method for synthesizing ethylene and oxalic acid from acetylene by bipolar electrochemical technology

A technology of chemical synthesis and acetylene, applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of polluted environment, harsh reaction conditions, complicated process flow, etc., and achieve simplified reaction steps, easy reaction, and simple process flow Effect

Inactive Publication Date: 2012-02-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for acetylene bipolar electrochemical synthesis of ethylene and oxalic acid, in order to overcome the disadvantages in the prior art of harsh raw materials, equipment and reaction conditions, complex process flow and environmental pollution

Method used

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Experimental program
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Effect test

Embodiment approach １

[0013] Add 1.0 mol / L Na 2 SO 4 solution 90 mL, and add 1.0 mol / L H 2 SO 4 Solution 90 mL, choose Ti-based oxide electrode as anode, Pd electrode as cathode, at room temperature and 140 mA / cm 2 The electrolysis is carried out at a certain current density, the cathode produces the required reducing agent hydrogen atoms or hydrogen gas, the anode produces the required oxidant oxygen atoms or oxygen, and the in-situ reduction reaction and the original Oxidation reaction to generate ethylene and oxalic acid, and then the mixed gas of unreacted acetylene and hydrogen discharged from the cathode chamber and the mixed gas of unreacted acetylene and oxygen discharged from the anode chamber are respectively circulated into the cathode chamber and the anode chamber , after 60 min of continuous reaction, the current efficiencies of cathode and anode can reach 57% and 27%, respectively.

Embodiment approach 2

[0015] Add 1.6 mol / L Na 2 SO 4 solution 90 mL, and add 1.5 mol / L H 2 SO 4 Solution 90 mL, choose Pt electrode as anode, Ni electrode as cathode, at room temperature and 60 mA / cm 2 The electrolysis is carried out at a certain current density, the cathode produces the required reducing agent hydrogen atoms or hydrogen gas, the anode produces the required oxidant oxygen atoms or oxygen, and the in-situ reduction reaction and the original Then, the mixed gas of acetylene and hydrogen and the mixed gas of acetylene and oxygen discharged from the cathode chamber and the anode chamber that have not participated in the reaction are circulated into the cathode chamber and the anode chamber respectively, and the reaction is continued for 90 minutes. , the current efficiencies of the cathode and anode can reach 48% and 33%, respectively.

Embodiment approach 3

[0017] Add 1.2 mol / L Na 2 SO 4 solution 90 mL, and add 1.3 mol / L H 2 SO 4 Solution 90 mL, choose Pt electrode as anode, Pt electrode as cathode, at room temperature and 40 mA / cm 2 The electrolysis is carried out at a certain current density, the cathode produces the required reducing agent hydrogen atoms or hydrogen gas, the anode produces the required oxidant oxygen atoms or oxygen, and the in-situ reduction reaction and the original Oxidation reaction to generate ethylene and oxalic acid, and then the mixed gas of acetylene and hydrogen and the mixed gas of acetylene and oxygen discharged from the cathode chamber and the anode chamber are respectively circulated into the cathode chamber and the anode chamber, and after 120 min of continuous reaction , the current efficiencies of the cathode and anode can reach 59% and 31%, respectively.

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Abstract

The invention discloses a method for synthesizing ethylene and oxalic acid from acetylene by a bipolar electrochemical technology. The method comprises the following steps that 0.5 to 2.0 mol / L of electrolyte is added into an electrolytic tank with an isolation membrane, a negative pole and a positive pole and then undergoes electrolysis under the conditions of a room temperature and current density of 40 to 140 mA / cm<2>; acetylene gas is fed into a negative pole chamber and a positive pole chamber simultaneously, wherein acetylene gas in the negative pole chamber undergoes an in-situ reduction reaction with reducing agent hydrogen atoms or hydrogen produced by the electrolysis to produce ethylene, and acetylene gas in the positive pole chamber undergoes an in-situ oxidation reaction withoxidizing agent oxygen atoms or oxygen produced by the electrolysis to produce oxalic acid; and unreacted acetylene-hydrogen mixed gas discharged from the negative pole chamber and unreacted acetylene-oxygen mixed gas discharged from the positive pole chamber are circularly fed respectively into the negative pole chamber and the positive pole chamber for re-reaction. The method simplifies reaction processes, shortens reaction time, saves energy, does not produce secondary pollution and is an environmentally friendly reduction and oxidation synthesis method.

Description

technical field [0001] The present invention is related to the synthesis of ethylene and oxalic acid from acetylene, specifically, it is a process for simultaneously synthesizing ethylene and oxalic acid from acetylene by electrolysis, that is, the process of reducing acetylene to generate ethylene and oxidizing acetylene to generate oxalic acid. Background technique [0002] Acetylene is the basic raw material of organic chemical products, and the coal chemical route: coal → calcium carbide → acetylene → ethylene and oxalic acid →... is a new idea for the synthesis of high value-added products from coal-based chemicals. The technology of synthesizing ethylene and oxalic acid by integrating coal-to-acetylene technology and electrochemical method can realize the continuous and large-scale production of coal chemical clean technology. It is a clean technology that can fully realize the efficient and clean utilization of coal. [0003] The existing ethylene production process c...

Claims

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Application Information

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IPC IPC(8): C25B3/00
Inventor 梁镇海宋秀丽段东红马旭莉刘世斌
Owner TAIYUAN UNIV OF TECH
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