Molecular Sieves Ki Ezikozesebwa mu Kulongoosa Amafuta FCC Catalysts?
FCC (Fluid Catalytic Cracking) catalysts ye kiraasi y’ebintu ebikola emirimu mingi ebikozesebwa mu nkola z’okulongoosa amafuta okukyusa obulungi hydrocarbons enzito okufuuka ebintu eby’omuwendo omungi-nga petulooli, ggaasi w’amafuta ow’amazzi, ne olefins ennyangu. Zitera okukolebwa ebitundu ebikola, ebintu ebikola matrix, ebisiba, n’ebijjuza.
Ebika N'emirimu Gya Molecular Sieves For FCC Catalysts
Ebiziyiza bya FCC birina asidi omungi, okutebenkera okulungi mu bbugumu ly’amazzi, n’eby’obugagga eby’amaanyi ebiziyiza -okwambala, ekibisobozesa okutumbula ensengekera ng’okukutuka, isomerization, n’okutambuza haidrojeni mu macromolecular hydrocarbons wansi w’embeera z’okufuumuuka okw’ebbugumu eringi-. Ekirala, nga tutereeza ekika kya molekyu ssefuliya, ebirimu ettaka eritali lya bulijjo, asidi, n’ensengekera y’obutuli, amakungula n’okulonda kw’ebintu ebigendereddwamu nga petulooli, propylene, ne LPG bisobola okulongoosebwa.
N’olwekyo, ebisengejja molekyu eby’enjawulo mu biwujjo bya FCC okusinga bikola emirimu gy’okutabula egy’okujjuliza. Y-type molecular sieves ne forms zazo ezikyusiddwa bye bitundu ebikulu ebikola mu FCC catalysts. Beta molecular sieve esobola okukozesebwa okulongoosa enjatika, isomerization, n’okulonda ebiva mu hydrocarbons ezenjawulo. Nga ekigatta ekikola, ZSM-5 esobola okulongoosa amakungula ga olefins ezitazitowa. Era ZSM-11 molekyu ssefuliya ekozesebwa mu kwatika okulonda enkula ya hydrocarbons n’okulungamya olefins ezitangaala.
USY Molecular Sieve: Ekitundu Ekikola Ekisinga Obukulu
Y-ekika kya molekyu ekisengejjaye kitundu ekikulu eky'okukutuka-ekikola ku FCC, eraY enywevu ennyo (USY) .ye kika kya zeolite ekisinga okwatika. Silika Y oba waggulu-Dealuminated Y (OLUNAKU) .byombi bisengejja molekyu za USY. USY esobola okutegeerwa nga zeolite ey’ekika kya Y- ebadde efunye obujjanjabi obw’okutebenkeza nga dealumination ne hydrothermal treatment.
Nga FCC catalysts bwe ziyita mu nsengekera z’ensengekera n’okuzza obuggya eziddiŋŋana, zirina okugumira ebbugumu eringi n’embeera ezirimu omukka-. N’olwekyo, USY eraga okutebenkera okw’amaanyi okw’amazzi, okuziyiza okw’amaanyi eri okuziyiza omukka, okutebenkera okw’amaanyi mu nkola, n’obusobozi obulungi ennyo obw’okukutula molekyo ennene.
REY/RE-USY Molecular Sieve: Ebalansi emirimu, Coke N'okutebenkera
Zaeyoyiti za Y ezikyusiddwa mu nsi ezitali nnyingi-zikwata omuwendo omunene ogw’amakolero mu biwujjo bya FCC. Ebintu eby’ensi ebitali bimu-ebizingirwamu mulimu La, Ce, ne Nd. Okuwanyisiganya ion z’ensi ezitatera kulabika kuyinza okulongoosa okutebenkera kw’ebbugumu, okutebenkera kw’ebbugumu ly’amazzi, asidi, emirimu, n’okulonda kwa koke okw’ebisengejja molekyu za zeolite ez’ekika kya Y-.
N’olwekyo, aba...REY (Ekitabula-Ensi Y) .neRE-USY (Etali ya bulijjo-Ensi Ultra-Y ennywevu)molekyu sieves zitera okukozesebwa mu petroleum FCC, okutumbula emirimu n’okutebenkera, n’okukuba bbalansi wakati w’emirimu gy’okutabula, amakungula ga coke, n’okulonda kwa petulooli/dizero.
Beta Molecular Sieve: Etereeza enkyukakyuka ya Hydrocarbons Entongole
Beta si ye mainstream core molecular sieve mu FCC catalysts ez’ennono, obutafaananako USY. Naye wabula, kisinga kuba kya ngeri ya nsengekera ebitongole oba ebisengejja molekyu za zeolite ebikyusiddwa ebikola.
Beta molekyu ekisengejjaerina topology ya BEA era erimu enkola ya pore ennene-dimension ssatu. Asidi yaayo ey’amaanyi n’emikutu gy’obutuli eminene bisobozesa okukozesebwa kwayo mu nkola za FCC ez’okukutula haidrokaboni, isomerization, n’okukutula amazzi-ensengekera ezikwatagana, wamu n’okulongoosa okulonda kw’ekisengejjero eky’omu makkati-n’okutumbula okukyusa haidrokaboni ezenjawulo.
ZSM-5 Molecular Sieve: Etumbula okutondebwa kwa Olefins ezitangaala
Omulimu gwa...ZSM-5 molekyu ekisengejjamu nkola za FCC ya njawulo, ekola nga FCC catalyst additive. Wadde nga zeolite ow’ekika kya Y- okusinga y’evunaanyizibwa ku kwatika molekyu ennene ez’amafuta enzito-, ZSM-5 essira erisinga kulissa ku kwongera okukyusa haidrokaboni ezisangibwa mu petulooli era n’etumbula okukola olefini ezitazitowa.
ZSM-5 zeolite erina ensengekera ya MFI erimu ensengekera ya microporous era eraga engeri ez’amaanyi ezilonda enkula. Okuyingiza ZSM-5 mu nkola za FCC mu ngeri entuufu kyongera ku makungula ga propylene, ethylene, LPG, ne olefins ezitazitowa, kikendeeza petulooli oba okukyusakyusa ebirungo bya olefini ebya petulooli. Era okugatta kwa USY ne ZSM-5 molekyu sieves nkola ya FCC catalyst eya bulijjo nnyo.
ZSM-11 Molecular Sieve: Etereeza Oba Shape-selectively Okukutuka
ZSM-11 ekisengejja kya molekyueri mu topology ya MEL, ensengekera efaananako ennyo n’ensengekera ya MFI eya ZSM-5. Omulimu gwayo mu nkola za FCC nga shape-selective cracking ne olefin regulation, nagwo gukwatagana n’ogwa ZSM-5 molecular sieve.
Mu nkola y’amakolero ga FCC, ZSM-11 molekyu sieve esobola okukozesebwa mu kwatika kwa hydrocarbon, okuwunya, n’okufuula isomerization, oba okukozesebwa nga FCC catalyst additive. Naye mu ngeri y’okukozesa FCC ku mutendera gw’amakolero, ZSM-11 molekyu sieve si wa makulu nnyo okusinga ZSM-5.
Sinmat Eddagalamukugu mu kugaba ebisengejja molekyu za zeolite eri ebisengejja bya FCC, omuli ebisengejja molekyu eby’ekika kya Y- (NaY, HY, USY, REY, RE-USY, DAY), ssefuliya ya molekyu ya Beta, ssefuliya ya molekyu ya ZSM-5, ne ssefuliya ya molekyu ya ZSM-11. Okumanya ebisingawo, laba empapula ezikwata ku bikozesebwa.
