Activated Alumina

Cov alumina siv nyob rau hauv tus neeg sawv cev catalytic, peb feem ntau hu nws Activated alumina. Nws yog ib hom ntxeem tau, cov khoom tawg yooj yim heev, nrog thaj chaw loj loj. Thiab Lub microporous nto muaj cov yam ntxwv uas yuav tsum tau ua rau catalytic nkaus, zoo li Adsorption zog, surfactivity, thiab Zoo heev thermal stability. Yog li nws yog dav siv los ua Catalyst thiab catalyst cab kuj rau cov tshuaj tiv thaiv. Lub spherical activated alumina varipressure roj sorbent yog dawb kheej kheej porous hais. Lub activated alumina yog epigranular, nrog du nto, muaj zog txhua yam, muaj zog hygroscopic. Thaum nws nqus dej, nws yuav tsis o los yog tawg tab sis tuav lub qub qub. Thiab nws yog innoxious, tsw, thiab Insoluble nyob rau hauv dej los yog ethanol. Active alumina yog cov desiccant muaj txiaj ntsig zoo nrog cov kab dej tob kom qhuav rau cov khoom siv hluav taws xob tsis muaj hluav taws xob.

Alumina, feem ntau hu ua bauxite, muaj cov tshuaj formula Al2O3. Dawb hmoov, nrog 3.9 ~ 4.0g / cm³ ceev, melting point 2050 ℃, boiling point 2980 ℃. Nws yog insoluble hauv dej tab sis maj mam yaj hauv cov concentrated sulfuric acid. Nws tuaj yeem siv los ua cov hlau txhuas thiab tseem yog cov khoom siv raw rau kev ua crucibles, porcelain, cov ntaub ntawv refractory thiab cov gemstones. Aluminium siv los ua sorbent, catalyst thiab catalyst carrier yog hu ua" active alumina", uas muaj ntxeem tau, siab dispersion thiab loj nto tsub kom tus yam ntxwv, lug siv nyob rau hauv petrochemical, nplua tshuaj, lom thiab tshuaj teb.

Active alumina feem ntau yog ua los ntawm txhuas hydroxide cua sov thiab lub cev qhuav dej. Aluminium hydroxide tseem hu ua hydration alumina, nws cov tshuaj muaj pes tsawg leeg yog Al2O3·nH2O. Raws li tus naj npawb ntawm cov dej crystalline muaj, feem ntau nws tuaj yeem muab faib ua trihydrate alumina thiab monohydrate alumina. Tom qab aluminium hydroxide yog cua sov thiab lub cev qhuav dej, γ-Al2O3 tuaj yeem tau. Ntawd yog, feem ntau hu ua activated alumina.

Activated alumina belongs rau qeb ntawm tshuaj alumina, uas yog tsuas yog siv rau adsorbent, dej purification tus neeg saib xyuas, catalyst thiab catalyst cab kuj. Activated alumina muaj kev xaiv adsorption ntawm gases, dej vapors thiab tej yam kua. Tom qab adsorption saturation, nws tuaj yeem sawv rov los ntawm 175 ~ 315 ℃ rau cua sov kom tshem tawm cov dej. Adsorption thiab sawv rov los yuav ua tau ntau zaus. Dhau li ntawm siv los ua desiccant, nws tuaj yeem nqus cov roj vapor los ntawm cov pa paug paug, hydrogen, carbon dioxide, cov pa roj carbon monoxide thiab lwm yam. Nws tuaj yeem siv los ua defluoragent hauv cov dej haus uas muaj fluorinated siab (nrog lub peev xwm siab), defluorination tus neeg sawv cev rau circulating alkanes hauv kev tsim cov alkylbenzene, deacidification regenerator rau cov roj transformer. Thiab nws kuj tuaj yeem siv tau los ua cov roj ziab hauv kev lag luam oxygen, kev lag luam textile thiab hluav taws xob kev lag luam, tsis siv neeg ntsuas cua kom qhuav, tshuaj chiv, petrochemical ziab thiab lwm yam lag luam ua desiccant thiab purification tus neeg sawv cev (lub lwg taw tes yuav yog -40 ℃), PSA ignition point hauv kev lag luam huab cua tuaj yeem ncav cuag -55 ℃. Nws yog ib qho zoo heev desiccant nrog sib sib zog nqus ziab ntawm cov kab dej uas tsim nyog rau cov khoom siv hluav taws xob tsis muaj hluav taws xob.

Muaj ob yam khoom siv rau kev tsim cov alumina, ib qho yog "ceev de pulverization" ua los ntawm gibbsite lossis bayerite. Lwm qhov yog pseudo boehmite ua ib txhij los ntawm aluminates los yog txhuas ntsev los yog ob qho tib si.

x-ρ tsim cov alumina

x-ρ alumina yog cov khoom siv tseem ceeb ntawm cov khoom siv alumina, FCA txawv teb chaws. Hauv Suav teb, cov hmoov alumina yog tsim los ntawm txoj kev ua kom lub cev qhuav dej sai, yog li peb hu nws sai de pulverization. Nws yog qhov sib xyaw ntawm x- alumina thiab ρ- alumina. Cov ntsiab lus sib txawv vim qhov sib txawv ntawm cov txheej txheem tsim khoom.

Txoj kev tsim khoom ntawm Pseudo Boehmite

Lub trihydrate alumina thiab monohydrate alumina tsim los ntawm ntuj los yog khoom siv tsis tuaj yeem siv los ua cov khoom siv desiccant, adsorbent, catalyst thiab catalyst cab kuj vim qis dua qhov chaw, qhov pore me me, thiab kev ua haujlwm tsawg. Lub trihydrate alumina thiab monohydrate alumina yuav tsum tau ua tiav rau hauv Pseudo Boehmite. Nws yog siab dua li qhov chaw saum npoo thiab muaj qhov pore loj, qhov aperture loj, thiab kev ua haujlwm siab, Nws yog tsim rau catalyst thiab catalyst cab kuj nyob rau hauv desiccant, adsorbent thiab tshuaj chiv thiab tso pa roj.

Cim npe nrov: qhib alumina