Fine ferric oxide desulfurizing agent and preparation method and application method thereof

Abstract

The invention discloses a fine ferric oxide desulfurizing agent and a preparation method and an application method thereof. The fine ferric oxide desulfurizing agent is prepared from ferrous sulfate septihydrate, calcium hydroxide, copper sulfate pentahydrate, sodium hydroxide, bentonite and sodium carboxymethylcellulose through mixing, strip extrusion and drying, and comprises, by mass, 57%-68% of ferrous sulfate septihydrate, 18%-25% of calcium hydroxide, 3%-8% of copper sulfate pentahydrate, 6.5%-18% of sodium hydroxide, 3%-10% of bentonite and 1%-3% of sodium carboxymethylcellulose. The fine ferric oxide desulfurizing agent is applied to removal of natural gas, coke-oven gas, oil field gas, synthesis gas, methane, carbon dioxide and organic sulfur such as H2S, COS and mercaptan in liquid hydrocarbon feed gas under the normal-temperature anaerobic condition and is high in desulfurization precision and sulfur capacity. The environment-friendly fine ferric oxide desulfurizing agent is prepared without washing and filtering, and the preparation method has the advantages of simple production technology, low equipment investment and maintenance cost and suitability for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to an iron oxide fine desulfurizer and a preparation and application method thereof. Background technique [0002] Common sulfur-containing gases in industry include coke oven gas, coal gas, synthetic gas, natural gas, coal field gas, petroleum processing by-product gas, oil gas, biogas, exhaust gas, etc. The sulfides contained in these gases include hydrogen sulfide And carbon dioxide, carbon disulfide, mercaptans, sulfides and other organic sulfur. The existence of sulfide will cause poisoning and deactivation of catalysts used in the subsequent processing of raw material gases such as coal gas and synthesis gas, and it will also cause corrosion to industrial gas transportation pipelines and processing equipment. In addition, if sulfide is directly discharged into the air, it will cause serious pollution to the environment and even cause human and animal poisoning. Ther...

AI Technical Summary

Problems solved by technology

[0005] However, most iron oxide desulfurizers in the prior art only have a single desulfurization function, that is, they can only remove H from the gas. 2 S, while organic sulfur such as COS and mercaptans cannot be removed or the removal effect is very poor

In addition, under anaerobic conditions, the H of most iron oxide desulfurizers 2 The removal effect of S is not ideal. For example, the iron oxide desulfurizers described in patents CN200710139233.X, CN200910034649.4, CN201010239075.7, and CN201410316813.1 can only remove H 2 S, and the desulfurization accuracy and sulfur capacity are not high under anaerobic conditions

[0006] Although a few disclosed iron oxide desulfurizers (such as patents CN97109175.7, CN00116020.6) can simultaneously remove H 2 S and organic sulfur such as COS and mercaptans, but there are the following disadvantages: (1) The desulfurizer is prepared by a wet method, and waste water is generated during the production process. If it is not treated effectively, it will pollute the environment; (2) The preparation of the desulfurizer requires the preparation of an aqueous solution of raw materials, complex processes such as washing and filtration, and the treatment of wastewater, which leads to a complicated production process of the desulfurizer; (3) equipment investment and maintenance costs are large, and the operation is cumbersome, which is not suitable for large-scale Industrial production