Studies On Production Of Psry Zeolite

In this paper. The calcination of PHY molecular sieve had been studied, the property of PHY molecular sieve was characterized by different calcination conditions, optimizing the technology of the pre-ion exchange process and dealumination and silicon reinsertion. Depth dealumination of PSRY molecular sieve had been studied, the optimal calcination condition was found out.The preferred calcination condition was as follows:calcination production was 700Kg/h, calcination temperature 610?, for delivering period after 780 ?, the amount of steam was 150 Kg/h.All the characterization including N2 adsorption-desorption, SEM and TG-DTG-DSC showed that:With lower calcination production, the molecular sieve skeleton would be collapsed, pore volume and specific surface area would be reduced; the thermal stability of the molecular sieve could be improved by increasing amount of steam, can improve the thermal stability of molecular sieve; calcination temperature was the main factor influencing cell shrinkage and the morphology of the molecular sieve.Optimized the technology of the pre-ion exchange process and the most suitable process conditions were obtained. The content of ammonia nitrogen in discharged water was greatly reduced. That may be a good idea for cleaner production of PSRY molecular sieve.Optimal production conditions of depth dealuminated of PSRY molecular sieve was as follows:PHY-S molecular sieve was calcinated by gas. the conditions of the depth dealumination and silicon reinsertion are that the ratio of sulfate and ammonium is 0.2n. the ratio of fluoro-silicate is 0.11m, the ratio of hydrochloric acid is 0.125x. The PHY-S molecular sieve had to be warmed up firstly in depth dealumination and silicon reinsertion, the best cell of PHY-S molecular sieve was 24.52-24.54A, crystallinity was higher 58%.