Method for non-aqueous phase wet oxidation of hydrogen sulfide

Abstract

The invention relates to a new method for non-aqueous phase wet oxidation of hydrogen sulfide by taking iron-based ironic liquid as an oxidant. The iron-based ironic liquid is highly hydrophobic liquid which is insoluble in water, and can effectively absorb hydrogen sulfide gas and quickly and efficiently oxidize the hydrogen sulfide gas into elemental sulfur. After centrifugation separation or filtering separation is performed on the sulfur, the iron-based ironic liquid is recycled after being oxidized by air or pure oxygen. Water produced in the recycling process can be automatically separated from the hydrophobic iron-based ironic liquid to prevent dilution of the iron-based ironic liquid by the water. The pH of a reaction system is not required to be adjusted in the process of oxidizing the hydrogen sulfide by using the iron-based ironic liquid, and the acidic characteristic of the iron-based ironic liquid prevents the generation of a sulfur-containing byproduct in the reaction process. Over 90 percent hydrogen sulfide removal efficiency can be achieved and secondary pollution is not caused during the non-aqueous phase wet oxidation of the hydrogen sulfide by adjusting the circulating flow of the ironic liquid and the flow of the hydrogen sulfide gas by an absorption-oxidation-separation-regeneration combined process.

Description

technical field [0001] The invention relates to a method for non-aqueous phase wet oxidation of hydrogen sulfide using iron-based ionic liquid as an oxidant. The method does not need to adjust the pH value, and the product water is automatically separated from the oxidant, which does not cause dilution and loss of the oxidant, and has no side effects. The product generation is a green wet oxidation hydrogen sulfide removal process. technical background [0002] Hydrogen sulfide is a toxic and harmful gas, which is mainly produced in various industrial production processes. The hydrogen sulfide produced in industrial production processes is mainly produced in the production process of gas manufacturing, synthetic ammonia industry, coal gasification, sewage treatment plants and paper mills. Its existence not only seriously threatens personal safety, but also causes corrosion of metal pipes and equipment. Hydrogen sulfide in industrial gases can also cause catalyst poisoning, ...

AI Technical Summary

Problems solved by technology

Wet desulfurization is divided into wet absorption and wet catalytic oxidation: the wet absorption method only concentrates hydrogen sulfide gas without converting it into other substances, so wet absorption and dry catalytic oxidation are often used in industry Oxidation is combined for desulfurization, but this will result in long process flow, complicated process and harsh operating conditions; wet catalytic oxidation method can directly convert hydrogen sulfide into sulfur element and the desulfurizer can be recycled, so it is widely used in large-scale processes. Often used in desulfurization

The common feature of traditional wet catalytic oxidation desulfurization processes is that they are all carried out in aqueous solution. With the progress of desulfurization reaction and desulfurization agent regeneration cycle, the desulfurization liquid is continuously diluted by the product water generated, and the pH value of the desulfurization system will also decrease. In order to maintain a certain desulfurization effect, it is necessary to regularly replenish desulfurization liquid and adjust process parameters such as pH, which eventually leads to complicated process operations

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