Adsorption Purification Of Waste Gas Of Low Concentrations Of Hcn

The phosphorus chemical industry and coal chemical industry hold a great proportion of Yunnan's economy. In recent years, the global producing of yellow phosphorus and carbide have been transferred China, along with conformity and technology advancement in yellow phosphorus and carbide enterprises, the single electric furnace and closed carbide furnace have became developed. Enables the comprehensive utilization this important C1 chemistry source of yellow phosphorus tail gas and closed carbide furnace tail gas, and the protection environment is the important issue which the sustainable development path faces in our country of phosphorus chemical industry and coal chemical industry enterprises, and also has provided the essential condition for the yellow phosphorus tail gas and closed carbide furnace tail gas comprehensive utilization formalization. The yellow phosphorus tail gas and closed carbide furnace tail gas include highly concentrated carbon monoxide. The exhaust can not get a better utilization of the most important limiting factor is it include many impurities (sulfur, phosphorus, fluorine, cyanide and so on), because these impurities have not been purified by technology of mature depth purification, result in it to be unable to use completely for a long time.This thesis aim to research adsorption purification of yellow phosphorus tail gas and closed carbide furnace tail gas. The emphases of article is on about adsorption performance of low-concentration hydrogen cyanide and reaction mechanism of modified activated carbon. Firstly, experiments were conducted to select active component of activated carbon adsorbent. secondly, single factor adsorption experiments of NaOH/CoPcS modified activated carbon adsorbent was studied. Thirdly, the adsorption samples of virgin activated carbon, virgin activated carbon adsorbed penetrated with HCN, NaOH modified activated carbon, NaOH modified activated carbon adsorbed penetrated with HCN, NaOH/CoPcS modified activated carbon and NaOH/CoPcS modified activated carbon adsorbed penetrated with HCN were characterized by N2-BET, SEM-EDS, Raman and XPS. Finally, reaction mechanism of modified activated carbon adsorbent was inferred by basic experiments and characterization.The results showed that the modified activated carbon impregnated in NaOH with suitable higher concentration can enhance the ability of activated carbon to absorb HCN. For certain concentration of NaOH,150ug/g of CoPcS/NaOH proportion,100℃of dryness temperature and 350℃of cremation temperature are optimum conditions for preparing modified activated carbon. Volume space velocity of 923h-1, oxygen content of 2% and adsorption temperature of 90℃are suitable conditions in adsorbing reaction phase. The specific surface area and pore structure properties of the activated carbon were tested with N2 adsorption. Compared with the virgin activated carbon, the specific surface area and pore volume of the impregnated ones were reduced while the adsorption capacity of HCN increased. This indicated that HCN reacts with the impregnant on the surface of activated carbon. Moreover, pore size distribution indicated that HCN was chemical adsorption at the mesopore or macraporous of modified activated carbon and forming micropore extending, but not micropore filling and covering.NaOH/CoPcS modified activated carbon adsorbent adsorbed with HCN may happen in the interface of chemisorption. Combining with basic experiments,Raman and XPS characterization of adsorbent, the adsorption purification mechanism of activated carbon adsorbent were inferred. It indicated that the adsorption capacity of modified activated carbon increased and to achieve the effectiveness of detoxification. HCN may be transformed SCN- or OCN- at the surface of activated carbon.