Fine desulfurization agent of zinc oxide as well as preparation and application methods thereof

Abstract

The invention relates to a fine desulfurization agent of zinc oxide as well as preparation and application methods thereof. The fine desulfurization agent is prepared by the following steps of: carrying out mixing and strip extruding on activated zinc oxide, high aluminum powder, bentonite, calcium hydroxide and sodium carboxymethylcellulose, drying the materials at 120 DEG C, and roasting the materials at 500 to 650 DEG C. The initial mass percentage composition of the fine desulfurization agent is that the activated zinc oxide accounts for 62.5%-86%, and a mixture of the high aluminum powder, the bentonite, the calcium hydroxide and the sodium carboxymethylcellulose accounts for the balance; and the mixture comprises the following components according to mass percentage: 17%-32% of the high aluminum powder, 17%-22% of the bentonite, 13%-44% of the calcium hydroxide and 10%-47% of the sodium carboxymethylcellulose. The fine desulfurization agent is applied to purification of H2S in coke-oven gas, refinery dry gas, natural gas, synthesis gas, carbon dioxide, liquefied petroleum gas and liquid hydrocarbon feed gas in a range from a room temperature to 400 DEG C, and can be used for partially removing COS (carbon oxide sulfide) and sulfur alcohol in a range from 200 to 400 DEG C; and the H2S content at an outlet is less than or equal to 0.03 ppm, and the removing rates of the COS and the sulfur alcohol are more than or equal to 50%.

Description

technical field [0001] The invention relates to the preparation of a fine zinc oxide desulfurizer and its application in raw material gases such as coke oven gas, refinery dry gas, natural gas, synthesis gas, carbon dioxide, liquefied petroleum gas, and liquid hydrocarbons. Background technique [0002] In the utilization process of coke oven gas, refinery dry gas, natural gas, synthetic gas, carbon dioxide, liquefied petroleum gas and liquid hydrocarbons, the sulfide in the gas source must be removed first, especially when it is used as chemical raw material gas , the sulfide must be removed to the total sulfur ≤ 0.1ppm, in order to avoid sulfur poisoning of the catalyst in the later stage, and at the same time ensure the quality of the produced product. [0003] Sulfide removal methods can generally be divided into dry and wet methods. [0004] The wet method is to use the absorption liquid to absorb the sulfide in the gas source. The absorption liquid (rich liquid) conta...

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Problems solved by technology

[0007] (1) Zinc oxide desulfurizer can be used in a wide range from room temperature to 400°C. At present, it can be generally divided into three types: high temperature, medium temperature and normal temperature. Different use temperatures use different formulations of desulfurizers and cannot be mixed;

[0008] (2) The preparation process mainly uses zinc salts, such as ZnCO 3 or Zn(CO 3 ) 2 , precipitate it with alkali, take the filter cake, add additives, pore expanders, binders, etc. to form it, and some preparation processes also need to wash the filter cake or add formic acid to increase its strength. As we all know, the former A large amount of difficult-to-treat wastewater will be produced, polluting the environment, and the latter will produce toxic substances such as CO during the roasting process, which also pollutes the environment;

[0009] (3) Traditional zinc oxide desulfurizers can only remove H 2 S, cannot remove organic sulfur such as COS and mercaptans