The Study On Catalyst Proportioning And Structure Performance Of A Y Type Molecule Sieve Prepared By Recycling Residue In-situ Synthesis

FCC catalysts prepared by the in-situ synthesis method,with high conversion rate of heavy oil,good product selectivity,low production rate of dry gas and coke,high resistant capability for heavy metal pollution and good hydrothermal stability,play an irreplaceable role in catalytic cracking of heavy oil.However,in order to acquire excellent FCC catalyst of this type,special requirements are needed for the main raw materials kaolin,such as its chemical composition and particle size distribution.This kaolin of high quality is not only expensive but also unavailable in common markets.So it has important research value to develop new cheap matrix materials.In addition,wastewater production workshop each catalyst factory at home and abroad in order to reduce the content of suspended solids in the discharge after compression,filtering,get a solid residue.Because of these catalyst residue is much higher than the cost of recycling value,so back to less dosage,generally with the buried method or in the slag dumping ground.Because the waste contains some harmful heavy metals,using landfill treatment will cause water pollution.Thus opened up a new economic reasonable comprehensive treatment catalyst residue method,has important significance to the environmental protection.In this study,NaY molecular sieve was successfully synthesised by hydrothermal synthesis technique under small and medium-sized experimental scale,using cheap catalyst cake partly replacing kaolin as matrix materials,which was high in crystallinity,suitable in particle size distribution and good in repeatability.Excellent cracking catalysts were prepared after modified by exchange.Through the improvement of spray mixture ratio,orthogonal experiments were carried out on E-F microspheres obtained in several spray,spray ratio higher crystallinity.Through the analysis of orthogonal test,the optimal crystallization conditions that E-F solution spraying microspheres,then the experiment and enlarged 30 times experiments on optimal crystallization conditions,compared to 6 of the size of solution crystallization.Results were similar and orthogonal experiment,E,F,H scheme is the highest crystallinity,3 schemes and magnified 30 times crystallization experiments crystallinity were above 50%.The enlarged 30 times crystallization experiment,molecular sieve size distribution and pore structure of the test,results show that the spray solution size distribution and pore structure is the optimal H scheme,the optimal crystallization conditions:roasting temperature of 600?,the guide agent 30g,the amount of water glass 40g,liquid dosage 5g,amount of water 36g.Mainly aimed at the molecular sieve h scheme,we discusse the content of high molecular sieve catalyst developed by in situ crystallization.The modified conditions,catalyst vanadium resistance performance and other aspects of the research,the conclusions are as follows:(1)To prevent the effect of Na2O on the catalytic performance,exchange after at least two times in the roasting before;(2)The RE2O3 content reaches 4.82%,coke selectivity and yield the most ideal;(3)In order to improve the problem of in-situ crystallization catalyst for heavy oil yield high,introduced a kind of porous components,heavy oil,coke and liquid yield and other key indicators are better than the conventional LB-5 catalyst;(4)In order to avoid the effect of vanadium on the in situ crystallization temperature of calcination temperature of catalyst,the crystallization process of slightly higher than 750?,or increase the content of rare earth solid vanadium effect can be achieved.Finally,in situ crystallization catalyst modified by fixed bed and riser evaluation,compared with traditional binder type catalyst,catalytic performance is significantly improved.