Waa maxay Sieves-ka Molecular-ka ee lagu Isticmaalo Sifaynta Shidaalka FCC Katalysts?
FCC (Fluid Catalytic Cracking) kiciyaasha waa nooc ka mid ah agabka firfircoonida badan ee loo isticmaalo hababka sifaynta batroolka si ay si hufan ugu beddelaan hydrocarbons culus -qiimo{1}} badeecooyin lagu daray sida shidaalka, gaaska dareeraha ah, iyo olefins fudud. Waxay caadi ahaan ka kooban yihiin qaybo firfircoon, agab matrix ah, xidhiyaal, iyo buuxinyaal.
Noocyada iyo Hawlaha Shaandhooyinka Molecular ee FCC Catalysts
Kiciyayaasha FCC waxa ay leeyihiin aysidh sare, degenaansho heerkuleed wanaagsan, iyo siyaalo adag oo ka hortaga-, iyaga oo awood u siinaya in ay kor u qaadaan falcelinta sida dildilaaca, isomerization, iyo wareejinta hydrogen ee macromolecular hydrocarbons hoos yimaada{1} xaaladaha dareere heerkulka sare. Intaa waxaa dheer, iyada oo la hagaajinayo nooca shaandhada molecular, nuxurka dhulka naadirka ah, aashitada, iyo qaab dhismeedka daloolka, wax-soo-saarka iyo xulashada alaabada la beegsanayo sida shidaalka, propylene, iyo LPG waa la wanaajin karaa.
Sidaa darteed, shaandhooyin molecular oo kala duwan oo ku jira kicinta FCC ayaa ugu horrayn ciyaara door katalytik ah oo dhammaystiran. Nooca shaandhada molecular iyo foomamkooda la bedelay ayaa ah qaybaha ugu muhiimsan ee firfircoonida FCC. Shaandho molecular Beta waxaa loo isticmaali karaa si loo hagaajiyo dildilaaca, isomerization, iyo xulashada wax soo saarka ee hydrocarbons gaar ah. Sida wax-ku-darka shaqaynaysa, ZSM{7}}5 waxay wanaajin kartaa wax-soosaarka olefins-ka fudud. Iyo ZSM-11 shaandho molecular waxaa loo isticmaalaa dildilaaca qaab-doorashada ee hydrocarbons iyo nidaaminta olefins iftiinka.
USY Molecular Sieve: Qaybaha Firfircoon ee ugu Muhiimsan
Nooca shaandho molecularwaa dildilaaca aasaasiga ah{0}}qaybta firfircoon ee FCC, iyoUltrastable Y (USY)waa nooca ugu badan ee dilaaca zeolite. Sare{1} silica Y amaLa dhammeeyay Y (MAALIN)labaduba waa USY shaandho molecular. USY waxa loo fahmi karaa sida Y{1}}nooca zeolite ee soo maray daawaynta xasilinta sida wax ka bedelka iyo daawaynta biyaha.
Marka FCC kiciyayaashu ay maraan wareegyo soo noqnoqda oo falcelin iyo dib u soo kabasho, waa inay u adkaystaan heerkulka sare iyo uumiga{0}} bey'ada qani ah. Sidaa awgeed, USY waxay soo bandhigtaa degganaansho heerkul sare leh, iska caabin xooggan oo deminta uumiga, xasilloonida qaabdhismeedka sare, iyo awoodda ugu wanaagsan ee dildilaaca molecules waaweyn.
REY/RE{0}USY Molecular Sieve: dheelitirka Hawsha, Coke iyo xasiloonida
Naadirka ah{0}} dhulka wax laga beddelay Y zeolites waxay ku hayaan qiime warshadeed oo muhiim ah kicinta FCC. Waxyaalaha naadirka ah- dhulka ee ku lug leh waxaa ka mid ah La, Ce, iyo Nd. Naadirka ah - sarifka ion dhulku waxa uu wanaajin karaa xasiloonida kulaylka, xasiloonida kayroodhka, aysiidhka, dhaqdhaqaaqa, iyo xulashada kookaha Y-nooca shaandhada molecular zeolite.
Sidaa darteed, theREY (Naadi-Dhul Y)iyoRE-USY (Naadi-Earth Ultra-Stable Y)Shaandhooyin molecular ah ayaa sida caadiga ah looga shaqeeyaa batroolka FCC, si kor loogu qaado dhaqdhaqaaqa iyo xasilloonida, iyo in la isku dheelitiro dhaqdhaqaaqa firfircoonida, dhalidda kookaha, iyo xulashada shidaalka/naaftada.
Beta Molecular Sieve: Waxay hagaajisaa beddelka Hydrocarbons Gaarka ah
Beta ma aha shaandho molecular xudunta u ah ee dhaqamada FCC, oo ka duwan USY. Laakiin taa beddelkeeda, waxay sifo badan u leedahay qaabab gaar ah ama shaandhooyin molecular zeolite ah oo la beddelay.
Shaandho molecular oo beta ahwaxa uu leeyahay BEA topology oo waxa uu leeyahay saddex -waa wayn{1}}nidaamka daldaloolada Aysiidhkeeda xoogga badan iyo kanaalada daldaloolada ee waaweyn ayaa awood u siinaya isticmaalkeeda codsiyada FCC ee dildilaaca hydrocarbon, isomerization, iyo hydrocracking{1}
ZSM-5 Molecular Sieve: Waxay kor u qaadaa Samaynta Olefins Iftiinka
DoorkaZSM-5 shaandho molecularNidaamyada FCC way kala duwan yihiin, waxay u shaqeysaa sidii wax lagu daro FCC. Halka Y{1}}nooca zeolite uu ugu horrayn masuul ka yahay dildilaaca unugyada saliidda ee waaweyn{2}}, ZSM{4}}5 waxa ay diiradda saartaa beddelka dheeraadka ah ee hydrocarbons-ka batroolku waxa uuna kor u qaadaa soosaarka olefins-ka fudud.
ZSM-5 zeolite waxa uu leeyahay qaab MFI ah oo leh qaab-dhismeed yar-yar oo waxa uu muujiyaa sifada qaab-doorashada dhawaaqa. Ku darida ZSM-5 ee nidaamyada FCC waxay caadi ahaan kordhisaa wax-soo-saarka propylene, ethylene, LPG, iyo olefins iftiinka, waxay yaraynaysaa batroolka ama waxay beddeshaa halabuurka olefin ee shidaalka. Iyo isku dhafka USY iyo ZSM-5 shaandhada molecular waa nidaamka kicinta FCC ee caadiga ah.
ZSM-11 Molecular Sieve: Habeeya ama qaabeeya si dooranaya dildilaaca
ZSM-11 shaandho molecularwaxa iska leh MEL topology, qaab dhismeed aad ula mid ah qaab dhismeedka MFI ee ZSM{1}}5. Shaqadeeda hababka FCC sida dildilaaca qaab-doorashada iyo nidaamka olefin, sidoo kale waxay la mid tahay tan ZSM-5 shaandho molecular.
Ku dhaqanka warshadaha FCC, ZSM{2}}11 shaandho molecular ayaa loo isticmaali karaa dildilaaca hydrocarbon, caraf udgoon, iyo kala soocida, ama loo shaqaaleysiiyo sidii wax lagu daro FCC. Si kastaba ha ahaatee, marka la eego codsiga heerka warshadaha FCC, shaandhada molecular ZSM-11 aad ayey uga yar tahay ZSM-5.
Kiimikada Sinmatku takhasusay bixinta shaandhada molecular zeolite ee FCC, oo ay ku jiraan Y{0}} nooca shaandhada molecular (NaY, HY, USY, REY, RE{{1}USY, DAY), shaandho molecular beta, ZSM-5 shaandho molecular, iyo ZSM-11 shaandho molecular. Faahfaahin dheeraad ah, fadlan tixraac bogga macluumaadka alaabta.
