Research Of THPC Synthesis By The High Concentration Of Phosphine In Industrial Emissions

Economic globalization has brought significant opportunities in the economic development of countries, but it also has posed serious challenges to national economic development strategy, in particular, the traditional path of industrialization in the developing countries. With the increase of human consumption and the acceleration of global phosphorus chemical process, the shortage phenomenon of phosphate resources is worsening with the development and utilization of the phosphate. China's Ministry of Land and Resources has set phosphate as one of minerals that it can not meet China's economic development demand after2010. Phosphate reserves and production in Yunnan Province is the most in the nation, and the phosphorus chemical industry is one of the important economic pillar of Yunnan Province, the total output of yellow phosphorus increase in the enterprises, while the mount of phosphorus sludge is also increasing. How to protect with the law and use resources rationally, improve resource utilization of resources, and use sustainably is an important issue, at the same time of resource development and utilization, in accordance, Group preliminary studies showed that a process of phosphoric sludge to the sodium hypophosphite is an effective comprehensive utilization of resources and means of pollution control, but in the process20%elemental phosphorus discharge in the form of phosphine and produce the high concentration of phosphine gas which still need to be addressed.Phosphine generated in the process of phosphoric sludge utilization is viewed as the this research object, with use of of high concentration of phosphine emissions flame retardants (THPC) is composited. However due to synthesis of THPC did not use catalyst in Traditional research,so the conversion rate of phosphine is the low. The reaction need to be screened in a highly efficient catalyst, in order to improve the comprehensive utilization rate of phosphine in the reaction time. In this study, the catalyst for efficient preparation of flame retardants THPC, using carrier-free catalyst copper chloride catalyzed and oxidated of phosphine gas.It is not only harmless treatment of phosphine, but also change the waste to the resources of the system and get the products flame retardants THPC, effectively improving the comprehensive utilization rate of phosphorus resources.The content of the study:on the basis of preliminary studies, a reasonable process is designed, and the experimental program is optimizated too; According to the classification and use of commonly catalyst in phosphorus chemistry, select the alumina, zinc oxide, chloroplatinic potassium copper chloride as a catalyst for this study, single factor experiments to examine the impact of a variety of conditions:space velocity, reaction time, reaction temperature, the ratio of raw materials and other factors on the synthesis process at phosphine conversion rate, to determine the optimum conditions.4factors and3levels of orthogonal experiment is conducted according to the results of single factor experiments, and phosphine conversion rate variance analysis to determine the phosphine conversion rate factors and the best of the process plan, and also product content and the reaction mechanism and analysis of dynamic process.Single-component catalyst screening and the optimal experimental conditions of the process conditions is determined, the single factor experiment:select CuC12as the optimal catalyst; airspeed in preparation of THPC conditions150h-1,the reaction temperature of60℃, the amount of catalyst0.75g, formaldehyde and andhydrochloric acid molar ratio of4:1. Phosphine conversion rate can reach95%. Product of flame retardant solution content is80%, which is in line with THPC requirements of industrial commodities.the THPC synthesis experiments is determined by orthogonal experiments, the factors that ring the rate of phosphine conversion from the main to order: airspeed, the reaction temperature, amount of catalyst, formaldehyde and hydrochloric acid molar ratio; optimal solution of screening process parameters:n(HCHO)/n (HC1)4:1, space velocity150h-1, the reaction temperature of60℃, the amount of catalyst0.75g. The research found that the reaction temperature had very significant effects on the synthesis of THPC with phosphine, and the airspeed also have a significant effect on phosphine conversion rate. The study showed that the catalyst samples contained a large number of active ingredients cuprous chloride which accelerated the synthesis reaction, this mainly due to the catalytic oxidation of copper chloride oxidation, making the conversion rate of phosphine greatly improve. Studies the macroscopic dynamics of the synthesis of flame retardants THPC have shown that reaction of synthetic flame retardants with phosphine, hydrochloric acid and formaldehyde under catalyst is first-order reaction.