Preparation method and application of efficient zinc oxide fine desulfurizing agent

Abstract

The invention relates to a preparation method of an efficient zinc oxide fine desulfurizing agent. The preparation method comprises the steps of enabling a sodium carbonate solution and a mixed solution of soluble zinc salt, soluble active aid salt and soluble carrier aid salt to react in a reactor of a microwave heating oven, carrying out microwave radiation aging and filtration under a stirring condition, preparing material liquid from a filter cake, carrying out spray drying and roasting, so as to obtain the finished desulfurizing agent. The efficient zinc oxide fine desulfurizing agent is high in sulfur capacity, simultaneously applicable to low-temperature, medium-temperature and high-temperature desulfurization and good in thermal stability.

Description

technical field [0001] The invention belongs to the field of preparation of a desulfurizing agent, in particular to a preparation method of a high-efficiency zinc oxide refined desulfurizing agent and the desulfurizing application of the desulfurizing agent. technical background [0002] 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. At present, there are mainly two types of desulfurization technologies at home and abroad: wet desulfurization and dry desulfurization: wet desulfurization technology uses the absorption liquid to absorb sulfide in the gas source, and is mainly used for low desulfurization temperature, large gas treatment capacity, and low hydrogen sul...

AI Technical Summary

Problems solved by technology

Although zinc oxide has high desulfurization accuracy, there are still some problems in the process of industrial application: (1) Although the use temperature of zinc oxide is relatively wide, it is mainly used for desulfurization at medium and high temperatures, but its low-temperature sulfur capacity is low, The performance is poor, which is not conducive to the rational use of heat energy and the requirements of energy saving and consumption reduction; (2) At present, different temperatures of high temperature, medium temperature and low temperature correspond to different zinc oxide desulfurizers, which cannot be mixed or used in general; (3) The sulfur capacity of ZnO varies with temperature However, the thermal stability of zinc oxide desulfurizer is poor. When the temperature rises above 600°C, zinc oxide is very volatile, which limits the regeneration of ZnO. It is only a one-time consumable. Due to the high price of zinc, the cost of desulfurization is increased

[0005] Patent CN102961959A discloses a zinc oxide fine desulfurizer and its preparation and application method. The patent mixes and extrudes active zinc oxide, high alumina powder, bentonite, calcium hydroxide and sodium carboxymethyl cellulose. It shows a certain desulfurization activity at room temperature to 400°C, but its desulfurization performance at room temperature is still poor, its sulfur capacity is only 3.1%, and the sulfur capacity at about 200°C is only about 7.8%, which is difficult to meet industrial applications

Patent 1094331A discloses a preparation method of zinc oxide desulfurizer at room temperature, which is mainly made by mixing ZnO and iron cement. At a temperature of 20-80°C, its sulfur capacity is only about 8.6-11.7%, and it is difficult to achieve industrialization requirements

Patent CN101485954A discloses a desulfurizer, the catalyst is mixed with nano-zinc oxide, copper oxide, binder, pore-forming agent and water to form a mixture, although the catalyst has a sulfur capacity of 24wt% at 200-250°C, but its The breakthrough sulfur capacity below 30°C is only 15.5wt%, which still cannot meet the requirements of industrial promotion

[0006] The above-mentioned patents disclose the preparation methods of various zinc oxide fine desulfurizers at room temperature, but the sulfur capacity at room temperature is relatively low, and the common problems of low-temperature, medium-temperature and high-temperature desulfurizers have not been solved, especially no zinc oxide that can be regenerated has been found so far. Report on industrial application of desulfurizer