The Preparation Of Ultra-low Sulfur Copper Based Desulfurizer And Its Desulfurization Performance

In order to improve the energy situation in China,which is rich in coal,short of gas and short of oil,the development of coal liquefaction products and clean fuel utilization technology has been preliminarily developed.In the process of coal liquefaction,the total sulfur content,especially carbonyl sulfur and hydrogen sulfide in the feedstock gas,of the fetor synthesis catalyst is required to be extremely high,which must be less than10ppb,otherwise the catalyst will be poisoned and deactivated.The total sulfur content in raw gas treated by a series of desulfurization is generally between 0.05ppm and 0.5ppm,and further desulfurization is required to be below 10ppb,requiring that desulfurizer has very high desulfurization accuracy.In order to solve the problem of low desulfurization accuracy of desulfurizer,copper oxide was used as the main active component of desulfurizer,and aluminum oxide was used as the main carrier to prepare copper-based desulfurizer.A series of characterization of desulfurizer was conducted,and H₂S and COS were used as target pollutants for desulfurization evaluation under 500h^-1condition.The main research contents are as follows:1.Copper-based desulfurizer was prepared by coprecipitation method and impregnation method,the desulfurization activity was evaluated and the desulfurizer was characterized,and the influence of the preparation method on the structure and desulfurization performance of the desulfurizer was explored.Results show that the coprecipitation method and impregnation method of copper base desulfurizer penetration capacity of 9.56%and 4.8%,respectively,than the surface of 58.91m²/g and 139.93m²/g,copper base desulfurizer and coprecipitation preparation is the average pore size of 11.44nm impregnation method was 1.4 times that of copper base desulfurizer preparation instructions on copper base desulfurizer had a greater influence on the pore structure of cloth,aperture is a key factor in desulfurization process.2.On the basis of coprecipitation preparation of copper base desulfurizer,change the roasting temperature,to evaluate the desulfurizer characterization,the results showed that:after 400?calcination of desulfurizer through sulfur capacity up to 10.88%,than the surface of 50.42m²/g,continue to improve the roasting temperature to 600?specific surface area,and sulfur capacity dropped to 30.54m²/g and 7.34%,it may be that the desulfurizer internal sintering caused tunnel collapse.Three factors including molar ratio of precipitant to metal salt,copper-aluminum molar ratio and reaction temperature were designed.Three horizontal orthogonal tests showed that the influence degree of each factor on the penetration sulfur capacity of copper based desulfurizer was in turn:the molar ratio of n_Al/n_Cu>the molar ratio of salt to alkali>reaction temperature.factor experiment were made to determine the desulfurizer preparation of optimum technological conditions of copper 67.5%,salt molar ratio of 1/1.25,temperature 70?.3.In order to improve the removal ability of cu-based desulfurizer for H₂S and COS,a third metal was added to prepare copper based composite metal.Desulfurization ability and structure of the compound desulfurizer were analyzed,and the results showed that adding a third metal desulfurizer after have improved than the surface,adding metal Mn maximum specific surface area of 119.13m²g^-1,penetrating sulfur capacity by 22.43%,adding metal zinc entrance and aperture and change smaller,CuO crystallinity changed little,but penetrates the sulfur capacity of the largest 25.74%,may be because the zinc in copper oxide lattice to form solid melting body;Ca-Cu-Al composite desulfurizer and Mg-Cu-Al have a negative effect on the desulfurization effect,because the addition of Ca affects the crystallization of CuO and the crystallinity decreases.The average pore diameter reached 18.89nm,pore volume was 0.41cm³/g,and the macropore size distribution reached 42.97%,indicating that the pore size distribution had a great influence on the desulfurization effect,and the macropore size was not conducive to the removal of hydrogen sulfide and carbonyl sulfur.