Production Technology Research And Development Application Of HRSY-4 Molecular Sieve

Molecular sieve is one of the main active components of FCC catalyst.The activity,selectivity and stability of the catalyst are closely related to its physical and chemical properties and preparation process.In order to upgrade the quality of gasoline oil,refineries have put forward higher requirements for the heavy oil conversion and coke selectivity of molecular sieves.However,conventional low rare-earth molecular sieve is unable to meet the needs of refinery production.Therefore,it is urgent to explore molecular sieves with low rare earth and high activity and thus enhance the competitiveness of enterprises.In this thesis,the research relies on the Lanzhou Petrochemical Industries Catalyst Factory,to develop a newly low rare-earth highly active molecular sieve,companying with the Research Institute.Through the pilot experiments and the process optimization in the industrial production,the successful production of low rare-earth high activity molecular sieve is achieved.The catalyst prepared by this molecular sieve is compared with the contrast agent.It is found that the coke yield is lower,which meets the need of upgrading gasoline and oil quality.Firstly,the effects of the concentration of alkaline solution on the properties of NaY molecular sieve were investigated.Meanwhile,the HRSY-4 and DASY-4 molecular sieves were compared in the workshop.The experimental results showed that the HRSY-4 zeolite had better performance than the conventional DASY-4 zeolite.Secondly,in the first industrial test of HRSY-4,the qualification rate of crystal cell constant and crystallinity of one or two calcined molecular sieve is low.On the basis of the preliminary production summary,we carried out the experimental study on the influence of the calcination conditions on the crystal cell constant and crystallinity in the industrial production.In actual production,the optimization of the roaster could effectively improve the roasting strength of the material.The L-a catalyst prepared by this molecular sieve was qualified and held good heavy oil conversion ability.The results of ACE evaluation showed that compared with the contrast agent,the yield of slurry,the coke and the dry gas yield of the catalyst decreased,while the gasoline yield and the total oil recovery were increased,and the gasoline octane number also enhanced.These demonstrate that this molecular sieve will be a promising application prospect in the future.