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A method for the electrochemical decomposition of hydrogen sulfide assisted by media

A medium and hydrogen sulfide technology, applied in electrolysis components, electrolysis process, electrodes, etc., can solve environmental pollution and other problems

Active Publication Date: 2019-11-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problem of increasing the value of hydrogen sulfide resources, and provides a method and device for electrochemically decomposing hydrogen sulfide assisted by a medium, which not only solves the problem of environmental pollution, but also increases the value of hydrogen sulfide, that is, a Technology that turns waste into treasure

Method used

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  • A method for the electrochemical decomposition of hydrogen sulfide assisted by media

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Embodiment 1

[0013] From left to right are the electrocatalytic reaction cell and the hydrogen sulfide absorption tower (see figure 1 ). The cathode chamber and the anode chamber in the electrocatalytic reaction cell are separated by a Nafion membrane, and there is a membrane in the hydrogen sulfide absorption tower. Add 0.5mol / L H in the cathode chamber 2 SO 4 aqueous solution. FeCl containing FeCl is added to both the anode chamber and the hydrogen sulfide absorption tower 3 and H 2 SO 4 1mol / L and 0.5mol / L aqueous solutions respectively. Put a MoP-loaded Ti sheet with a size of 2cm×2cm in the cathode chamber, place a C sheet with a size of 2cm×2cm as an anode in the anode chamber, and connect the cathode and anode with an external constant voltage source through a wire, and connect the ammeter in series into the circuit. The reaction constant voltage source applies a 0.8V DC voltage, the gas flow rate of hydrogen sulfide is 0.65ml / min, and the purity is greater than 99.9%. Afte...

Embodiment 2

[0014] Embodiment two: the difference with embodiment one is:

[0015] Add KI and H 2 SO 4 1mol / L and 0.5mol / L aqueous solutions respectively. The conversion of hydrogen sulfide was 82%.

Embodiment 3

[0016] Embodiment three: the difference with embodiment one is:

[0017] Add Ce(NO 3 ) 3 and H 2 SO 4 1mol / L and 0.5mol / L aqueous solutions respectively. The conversion of hydrogen sulfide was 56%.

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Abstract

The invention discloses a method for electrochemically decomposing hydrogen sulfide in a mediator-assisted mode, and relates to a method and device for converting hydrogen sulfide. The method is characterized in that hydrogen sulfide conversion is performed in two steps, so that hydrogen sulfide is decomposed into an element sulfur and hydrogen gas, wherein the first step is accomplished in an electro-catalysis device, and protons are subjected to electrocatalytic reduction through a cathode to generate hydrogen gas while an oxidization-state mediator is obtained at an anode; the second step is performed in a second adsorption tower, the oxidization-state mediator is conveyed to a hydrogen sulfide absorption tower through a pump to react with hydrogen sulfide to obtain the element sulfur and hydrogen ions; and the element sulfur is separated and recycled, and the hydrogen ions and a reduction-state mediator are conveyed to an electrocatalytic device through the pump to complete a cycle.

Description

technical field [0001] The invention relates to a method and a device for converting hydrogen sulfide Background technique [0002] As a harmful gas, hydrogen sulfide exists in large quantities in coal bed methane, shale gas and natural gas, and is also produced in large quantities in petroleum refining, natural gas processing and other chemical synthesis processes. At present, the industry mainly uses Claus to solve the problem of hydrogen sulfide. [0003] h 2 S+3 / 2O 2 → SO 2 +H 2 O (1) [0004] 2H 2 S+SO 2 →2H 2 O+3 / xS x (2) [0005] The traditional Claus process can partially oxidize hydrogen sulfide to form water and sulfur, recover sulfur in hydrogen sulfide, and hydrogen is oxidized into water to generate waste. Contents of the invention [0006] The present invention aims to solve the problem of increasing the value of hydrogen sulfide resources, and provides a method and device for electrochemically decomposing hydrogen sulfide assisted by a medium, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/02C25B1/00C25B11/06C25B11/08C25B11/12
CPCC25B1/00C25B1/02C25B11/043C25B11/057C25B11/069
Inventor 李灿宗旭马伟光韩晶峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI