Ke Li-Sieves Life tse Sebelisitsoeng ho Petroleum Refining FCC Catalysts?
Li-catalysts tsa FCC (Fluid Catalytic Cracking) ke sehlopha sa lisebelisoa tse sebetsang tse ngata tse sebelisoang ho hloekisa petroleum ho fetolela li-hydrocarbon tse boima hore e be -lihlahisoa tsa boleng bo holimo-tse kang peterole, liquefied petroleum gas, le light olefin. Hangata li entsoe ka likarolo tse sebetsang, lisebelisoa tsa matrix, li-binders le li-filler.
Mefuta le Mesebetsi ea Sieve ea Molek'hule Bakeng sa Li-Catalysts tsa FCC
Li-catalyst tsa FCC li na le asiti e phahameng, hydrothermal stability, le thepa e thibelang{0}e matla e thibelang ho roala, e li thusang ho khothaletsa maikutlo a kang ho pshatleha, isomerization, le phetiso ea haedrojene ea macromolecular hydrocarbons tlas'a{1}}maemo a phahameng a mocheso. Ho feta moo, ka ho lokisa mofuta oa sieve ea limolek'hule, lintho tse sa tloaelehang tsa lefats'e, acidity, le pore pore, tlhahiso le khetho ea lihlahisoa tse lebisitsoeng tse kang peterole, propylene le LPG li ka ntlafatsoa.
Ka hona, li-sieve tse fapaneng tsa limolek'hule ho li-catalyst tsa FCC li bapala karolo ea tlatsetso. Y-lisefa tsa molek'hule tsa mofuta oa Y{1} le mefuta ea tsona e fetotsoeng ke likarolo tsa mantlha tsa li-catalyst tsa FCC. Sieve ea limolek'hule ea Beta e ka sebelisoa ho ntlafatsa ho phatloha, ho nyenyefatsa, le khetho ea lihlahisoa tsa li-hydrocarbon tse itseng. Joalo ka sehlomathiso se sebetsang, ZSM-5 e ka ntlafatsa tlhahiso ea li-olefin tse bobebe. 'Me sieve ea molek'hule ea ZSM-11 e sebelisoa bakeng sa ho phunyeha ha li-hydrocarbon tse khethiloeng ka sebōpeho le ho laola li-olefin tse khanyang.
USY Molecular Sieve: Karolo ea Bohlokoa ka ho Fetisisa e sebetsang
Y-mofuta oa sieve ea molek'huleke eona ntho ea mantlha-karolo e sebetsang bakeng sa FCC, leY (USY)ke mofuta o hlahelletseng oa li-zeolite. Holimo-silica Y kapaE khethiloe ka Y (DAY)ka bobeli ke li-sieve tsa USY tsa molek'hule. USY e ka utloisisoa e le Y-type zeolite e kileng ea etsoa liphekolo tsa botsitso tse kang delumination le hydrothermal treatment.
Ha li-catalysts tsa FCC li ntse li tsoela pele ho etsa lintho le ho nchafatsa, li tlameha ho mamella mocheso o phahameng le tikoloho e nonneng-. Ka lebaka leo, USY e bonts'a botsitso bo phahameng ba hydrothermal, khanyetso e matla ea ho tima mouoane, botsitso bo phahameng ba moralo, le bokhoni bo botle ba ho senya limolek'hule tse kholo.
REY/RE-USY Molecular Sieve: Ho leka-lekanya Mosebetsi, Coke le Botsitso
-li-Y zeolite tse fetotsoeng tsa lefatše li na le boleng ba indasteri ho li-catalyst tsa FCC. Lintho tse sa tloaelehang-likarolo tsa lefatše tse amehang li kenyelletsa La, Ce, le Nd. Ho fapanyetsana-earth ion exchange ho ka ntlafatsa botsitso ba mocheso, hydrothermal stability, acidity, activity, and coke selectivity ea Y-type zeolite molecular sieves.
Ka hona, theREY (Rare-Earth Y)leRE{{0}USY (Rare-Earth Ultra-Stable Y)li-sieve tsa limolek'hule hangata li sebelisoa petroleum FCC, ho ntlafatsa ts'ebetso le botsitso, le ho leka-lekanya ts'ebetso e matla, tlhahiso ea coke, le khetho ea peterole / disele.
Beta Molecular Sieve: E Ntlafatsa Phetoho e khethehileng ea Hydrocarbons
Beta ha se seseo sa mantlha sa limolek'hule ho li-catalyst tsa setso tsa FCC, ho fapana le USY. Empa ho e-na le hoo, e na le tšobotsi e 'ngoe ea mekhoa e khethehileng kapa li-sieve tse fetotsoeng tsa zeolite molecular.
Beta molecular sievee na le thuto ea maemo a holimo ea BEA 'me e na le-seseteme e kholo ea{1}}ea mahlakore a mararo. Asiti ea eona e matla le likanale tse kholo tsa pore li lumella hore e sebelisoe ho FCC bakeng sa hydrocarbon cracking, isomerization, le hydrocracking-mekhoa e amanang le eona, hammoho le ho ntlafatsa khetho e bohareng-ea distillate le ho khothalletsa phetoho ea li-hydrocarbon tse itseng.
ZSM-5 Sieve ea Molek'hule: E Khothalletsa Tlhahiso ea Olefins ea Leseli
Karolo eaZSM-5 sieve ea molek'hulelits'ebetsong tsa FCC e ikhethile, e sebetsa joalo ka sehlomathiso sa FCC. Le ha Y-type zeolite e ikarabella haholo bakeng sa ho petsola limolek'hule tse boima tsa-oli, ZSM-5 e shebane le tokiso e tsoelang pele ea li-hydrocarbons tsa mefuta ea peterole le ho khothaletsa tlhahiso ea li-olefin tse bobebe.
ZSM-5 zeolite e na le moralo oa MFI o nang le sebopeho sa microporous mme e bonts'a libopeho tse ikhethileng tsa sebopeho. Ho kenyelletsa ZSM-5 ho litsamaiso tsa FCC hangata ho eketsa chai ea propylene, ethylene, LPG, le olefin e bobebe, ho fokotsa peterole kapa ho fetola sebopeho sa olefin sa peterole. 'Me motsoako oa li-sieve tsa USY le ZSM-5 tsa molek'hule ke mokhoa o tloaelehileng oa ho thusa FCC.
ZSM-11 Sieve ea Molek'hule: E Laola Kapa Sebōpeho-Seo se ikhethelang
ZSM-11 sieve ea molek'huleke ea MEL topology, sebopeho se ts'oanang haholo le sebopeho sa MFI sa ZSM-5. Ts'ebetso ea eona lits'ebetsong tsa FCC joalo ka ho petsoha ha sebopeho le taolo ea olefin, hape e ts'oana le ea sieve ea molek'hule ea ZSM-5.
Litloaelong tsa indasteri ea FCC, ZSM-11 sefo ea molek'hule e ka sebelisoa bakeng sa ho petsoha ha hydrocarbon, aromatization, le isomerization, kapa ea sebelisoa e le sehlomathiso sa FCC. Leha ho le joalo, mabapi le ts'ebeliso ea boemo ba indasteri ea FCC, sieve ea molek'hule ea ZSM-11 ha e bohlokoa haholo ho feta ZSM-5.
Sinmat Chemicale sebetsa haholo ka ho fana ka lisefa tsa molek'hule tsa zeolite bakeng sa li-catalysts tsa FCC, ho kenyeletsoa Y-type molecular sieve (NaY, HY, USY, REY, RE{{1}USY, DAY), Beta molecular sieve, ZSM-5 molecular sieve, le ZSM-11 molecular sieve. Bakeng sa lintlha tse ling, ka kopo sheba maqephe a tlhahisoleseding ea sehlahisoa.
