Ndeapi maMolecular Sieves Anoshandiswa muPetroleum Refining FCC Catalysts?
FCC (Fluid Catalytic Cracking) catalysts ikirasi yezvishandiso zvakawanda zvinoshandiswa mukukwenenzvera petroleum kushandura nemazvo mahydrocarboni anorema kuita-ukoshi-zvakawedzerwa zvigadzirwa zvakaita sepeturu, gasi repetroleum rakanyungudutswa, uye malight olefin. Iwo anowanzo kuumbwa nezvinhu zvinoshanda, matrix zvinhu, mabhainda, uye mafirita.
Mhando uye Mashandiro EmaMolecular Sieves eFCC Catalysts
FCC catalysts ine acidity yakakwira, kugadzikana kwehydrothermal, uye -inodzivirira kupfeka kwakasimba, zvinodzigonesa kusimudzira kuita sekutsemuka, isomerization, uye kufambiswa kwehydrogen kwema macromolecular hydrocarbons pasi pe{1}}tembiricha yekunyungudika. Uye zvakare, nekugadzirisa iyo molecular sieve mhando, isingawanzo pasi pasi, acidity, uye pore chimiro, goho uye kusarudzwa kwezvinhu zvinotangwa zvakaita sepeturu, propylene, uye LPG zvinogona kuvandudzwa.
Naizvozvo, masieve akasiyana-siyana muFCC catalysts anonyanya kutamba mabasa ekuwedzera. Y-type molecular sieves uye mafomu awo akagadziridzwa ndiwo musimboti unoshanda zvikamu zveFCC catalysts. Beta molecular sieve inogona kushandiswa kuvandudza kutsemuka, isomerization, uye kusarudza kwechigadzirwa kweakananga mahydrocarbon. Sekuwedzera kunoshanda, ZSM-5 inogona kuvandudza goho remaolefin akareruka. Uye ZSM-11 molecular sieve inoshandiswa kune chimiro-selective cracking of hydrocarbons uye kudzora kwechiedza olefins.
USY Molecular Sieve: Yakanyanya Kunyanya Kushanda Chikamu
Y-type molecular sievendicho chinhu chakakosha kutsemura-chikamu cheFCC, uyeUltrastable Y (USY)ndiyo inonyanya kupaza zeolite mhando. Yepamusoro-silica Y kanaDealuminated Y (DAY)ese ari maviri USY molecular sieves. USY inogona kunzwisiswa seY-type zeolite yakagadziriswa marapiro akaita sedelumination uye hydrothermal treatment.
Sezvo maFCC catalysts arikudzokororwa kuita uye kugadzirwa patsva, anofanirwa kushingirira tembiricha yepamusoro uye -nzvimbo dzakapfuma. Nekuda kweizvozvo, USY inoratidza yakakwira hydrothermal kugadzikana, kuramba kwakasimba kune deactivation yeutsi, kugadzikana kwepamusoro, uye kugona kwakanyanya kwekupwanya mamorekuru makuru.
REY/RE-USY Molecular Sieve: Zviyero Chiitiko, Coke uye Kugadzikana
Kashoma-nyika yakagadziridzwa Y zeolites ine kukosha kwakakosha muindasitiri muFCC catalysts. Zvinhu zvisingawanzoitiki-zvepasi zvinosanganisirwa zvinosanganisira La, Ce, naNd. Kashoma-kuchinjanisa ion kwepasi kunogona kuvandudza kugadzikana kwemafuta, kugadzikana kwehydrothermal, acidity, kuita, uye kusarudza kwecoke kweY-type zeolite molecular sieves.
Naizvozvo, theREY (Kashoma-Nyika Y)uyeRE-USY (Kashoma-Earth Ultra-Stable Y)ma molecular sieves anowanzo shandiswa mu petroleum FCC, kuwedzera chiitiko uye kugadzikana, uye kurova chiyero pakati pekuita zvinokonzeresa, goho recoke, uye peturu/dhiziri kusarudza.
Beta Molecular Sieve: Inovandudza Chaiyo Hydrocarbons Shanduko
Beta haisiriyo yakajairwa musimboti molecular sieve mune yechinyakare FCC catalysts, kusiyana neUSY. Asi pane kudaro, inonyanya hunhu hwemagadzirirwo chaiwo kana inoshanda yakagadziridzwa zeolite molecular sieves.
Beta molecular sieveine BEA topology uye inoratidzira-dimensional yakakura-pore system. Asidhi yaro yakasimba uye machani epore mahombe anoita kuti ishandiswe muFCC pakutsemuka kwehydrocarbon, isomerization, uye hydrocracking-zvinechekuita nekuita, pamwe nekuvandudza pakati-distillate selectivity uye kusimudzira kushandura mahydrocarbon chaiwo.
ZSM-5 Molecular Sieve: Inosimudzira Chiedza cheOlefins Kuumbwa
Basa reZSM-5 molecular sievemuFCC maitiro akasiyana, anoshanda seFCC catalyst additive. Nepo Y-type zeolite ichinyanya kuita zvekutsemura mamorekuru anorema-emafuta, ZSM-5 inotarisa pakumwe kushandura mahydrocarboni epeturu uye inosimudzira kugadzirwa kwemaolefin akareruka.
ZSM-5 zeolite inoratidzira MFI framework ine microporous structure uye inoratidza yakadudzwa chimiro-selective catalytic maitiro. Kubatanidza ZSM-5 muFCC masisitimu kunowanzo wedzera goho repropylene, ethylene, LPG, uye chiedza olefins, kunoderedza peturu kana modulates olefin kuumbwa kwepeturu. Uye kusanganiswa kweUSY uye ZSM-5 molecular sieves yakajairika FCC catalyst system.
ZSM-11 Molecular Sieve: Inotonga kana Shape-selectively Cracking
ZSM-11 molecular sievendeyeMEL topology, chimiro chakada kufanana neMFI chimiro cheZSM-5. Basa rayo muFCC maitiro akadai sechimiro-selective cracking uye olefin regulation, zvakare yakafanana neiyo ZSM-5 molecular sieve.
MuFCC industrial practice, ZSM-11 molecular sieve inogona kushandiswa hydrocarbon cracking, aromatization, and isomerization, kana kushandiswa seFCC catalyst additive. Nekudaro, maererano neindasitiri-mwero FCC application, ZSM-11 molecular sieve haina kukosha zvakanyanya pane ZSM-5.
Nhoroondo ye Sinmat Chemicalinyanzvi mukugovera mazeolite molecular sieve eFCC catalysts, kusanganisira Y-type molecular sieves (NaY, HY, USY, REY, RE{{1}USY, ZUVA), Beta molecular sieve, ZSM-5 molecular sieve, uye ZSM-11 molecular sieve. Kuti uwane rumwe ruzivo, ndapota tarisa kune iyo chigadzirwa ruzivo mapeji.
