Preparation method and application of a double-functional fine desulfurizer

Abstract

A preparation method of a bifunctional fine desulfurizer comprises steps as follows: a sodium carbonate solution reacts with soluble zinc salt and first active auxiliary salt under microwave, a first precipitation solution is obtained, and the sodium carbonate solution reacts with an aluminum nitrate solution under microwave, and a second precipitation solution is obtained; part of the second precipitation solution is treated, alumina powder is obtained, the other part of the second precipitation solution is mixed with the first precipitation solution, microwave radiation ageing and filtering are performed, a feed solution is prepared from a filter cake, spray drying is performed, precursor powder is obtained and retreated, zinc oxide composite oxide powder is obtained, a mixed salt solution of soluble molybdenum salt and second active auxiliary salt are subjected to equivalent-volume impregnation, drying and calcination with the alumina powder, and molybdenum oxide composite oxide powder is obtained, and the zinc oxide composite oxide powder, the molybdenum oxide composite oxide powder, a binder, a pore forming agent and water are molded, dried and calcined, and a finished product is obtained. The preparation method has the advantage of high sulfur capacity.

Description

technical field [0001] The invention belongs to the field of preparation of desulfurizers, and in particular relates to a preparation method and application of a dual-functional fine desulfurizer for hydrogenation conversion and removal of organic sulfur. [0002] technical background [0003] At present, in the conversion and utilization of coal-to-synthesis gas, natural gas, coke oven gas, refinery dry gas, liquefied petroleum gas, carbon dioxide and liquefied hydrocarbons as chemical raw materials, the sulfide in the gas must be removed, which not only avoids the Catalyst poisoning in the follow-up section also ensures the quality of the product. There are mainly two types of desulfurization technologies at home and abroad: wet desulfurization and dry desulfurization: wet desulfurization technology uses absorption liquid to absorb sulfide in the gas source, and is mainly used for low desulfurization temperature, large gas treatment capacity, high hydrogen sulfide content a...

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Problems solved by technology

Patent CN104941439A discloses a super-precision dual-function fine desulfurizer and its preparation method. The catalyst is composed of 50-70% zinc oxide or zinc carbonate, 1-5% copper oxide, 0-5% potassium carbonate, 0.1-0.5% Silver nitrate, 25-50% alumina and 1-10% binder, the desulfurizer shows good desulfurization accuracy in the desulfurization of chemical raw materials, but its low-temperature sulfur capacity is low, only 5wt %, the best desulfurization temperature is 200-350℃

[0006] The above-mentioned patents disclose a variety of organic sulfur conversion and absorption dual-function desulfurizers. Although the conversion efficiency of organic sulfur is relatively high, the sulfur capacity of the above-mentioned dual-functional desulfurizers, especially low-temperature sulfur capacity, limits their promotion. and application