Txoj Kev Npaj Ntawm Catalyst

Txhua txoj hauv kev ntawm kev ua cov catalyst yog qhov sib xyaw ua ke ntawm cov haujlwm ua haujlwm. Txhawm rau kom yooj yim, lub npe ntawm qhov tseem ceeb thiab cov yam ntxwv ua haujlwm tau teeb tsa raws li lub npe ntawm txoj kev tsim khoom. Cov txheej txheem ib txwm muaj xws li kev sib xyaw ua ke, txoj kev los nag, txoj kev impregnation, txoj kev daws evaporation, txoj kev kub melting, txoj kev ntub dej (leaching method), ion exchange method, thiab lwm yam. Cov txheej txheem tshiab tau tsim tam sim no suav nrog txoj kev sib txuas tshuaj, txoj kev fibrillation, thiab lwm yam. .

1. Mechanical mixing method

Ntxiv ob los yog ntau yam tshuaj rau hauv cov khoom sib tov thiab sib tov. Txoj kev no yog qhov yooj yim thiab yooj yim rau kev siv, xws li kev tsim khoom ntawm kev hloov pauv - nqus hom desulfurizer, uas yog ntsuas cov hmoov ntawm cov khoom nquag (xws li manganese dioxide, zinc oxide, zinc carbonate) thiab ib qho me me ntawm binder (xws li magnesium oxide, calcium oxide). Tsis tu ncua ntxiv nws mus rau lub turntable nrog adjustable rotation ceev thiab inclination, thiab nyob rau tib lub sij hawm txau ib tug metered dej thiab hmoov rau yob, sib tov thiab daim ntawv cog lus rau ib tug kheej kheej nrog ib tug uniform txoj kab uas hla.

2. Dej nag

Txoj kev no yog siv los ua cov catalysts uas yuav tsum tau muaj kev sib cais siab thiab muaj ib lossis ntau dua hlau oxides. Hauv kev tsim cov khoom siv ntau-cov khoom siv catalysts, cov dej nag tsim nyog yog qhov tseem ceeb heev los xyuas kom meej qhov sib xws ntawm cov khoom muaj pes tsawg leeg thiab tsim cov khoom zoo siab - cov catalysts zoo. Txoj kev niaj zaus yog ntxiv cov dej nag (xws li sodium carbonate, calcium hydroxide) rau ib lossis ntau dua hlau ntsev tov, thiab kom tau txais cov khoom kawg tom qab nag lossis daus, ntxuav, lim, ziab, molding, roasting (los yog ua kom muaj zog).

3. Txoj kev dipping

Cov cab kuj nrog cov porosity siab (xws li lub ntiaj teb diatomaceous, alumina, activated carbon, thiab lwm yam) yog immersed nyob rau hauv cov tshuaj uas muaj ib los yog ntau tshaj hlau ions, thiab cov tshuaj yog khaws cia nyob rau hauv ib tug tej yam kub, thiab cov tshuaj nkag mus rau hauv lub pores ntawm cov cab kuj. . Cov cab kuj yog drained, qhuav thiab calcined, thiab ib txheej ntawm cov khoom uas xav tau hlau oxide los yog nws cov ntsev yog txuas mus rau sab hauv ntawm cov cab kuj.

4. tshuaj tsuag kom qhuav

Nws yog siv los ua catalysts rau fluidized txaj nrog particle diameters li ntawm kaum ntawm microns mus rau pua pua microns. Piv txwv li, nyob rau hauv zus tau tej cov meta-xylene fluidized txaj ammoxidation rau meta-dicarbonitrile catalyst, ua ntej, ib tug muab concentration thiab ntim ntawm metavanadate thiab chromium ntsev aqueous tov yog tag nrho tov, thiab ces tov nrog quantitatively. Freshly npaj silica gel, pumped rau hauv lub tshuab ziab khaub ncaws, tom qab tau atomized los ntawm lub nozzle, cov dej evaporates kom qhuav nyob rau hauv qhov kev txiav txim ntawm cov cua kub ntws, thiab cov ntaub ntawv tsim ib tug microsphere catalyst, uas yog tsis tu ncua kos los ntawm hauv qab ntawm lub tshuaj tsuag tshuab ziab khaub ncaws.

5. kub yaj txoj kev

Txoj kev kub - melting method yog ib txoj hauv kev tshwj xeeb rau kev npaj qee cov catalysts, uas tsim nyog rau cov catalysts me me uas yuav tsum tau mus dhau cov txheej txheem smelting. Lub hom phiaj yog kom smelt lub Cheebtsam nyob rau hauv high kub tej yam kev mob thiab hu nws ib tug uniformly faib sib tov. Nrog rau qhov tsim nyog ua tom qab, nws tuaj yeem tau txais. Zoo heev catalyst.

6. Txoj kev immersion

Los ntawm cov txheej txheem ntau- cov khoom siv, cov kua dej tsim nyog (lossis dej) yog siv los rho tawm ib feem ntawm cov khoom los ua cov catalyst nrog cov qauv ntxeem tau. Piv txwv li, hauv kev tsim cov pob txha pob txha npib tsib xee catalyst, ib qho nyiaj npib tsib xee thiab txhuas yog yaj hauv lub cub hluav taws xob, thiab cov khoom siv molten yog txias los ua ib qho hlau. Cov hlau yog tawg mus rau hauv me me, soaked nyob rau hauv sodium hydroxide aqueous tov, thiab feem ntau ntawm cov txhuas yog yaj (los tsim sodium metaaluminate). ), piv txwv li qhov tsim ntawm ib tug ntxeem tau heev active moj khaum npib tsib xee.

7. ion pauv txoj kev

Cov hlau cations (piv txwv li Na) ntawm qee yam khoom siv crystalline (xws li hluavtaws zeolite molecular sieves) tuaj yeem pauv nrog lwm cov cations. Muab tso rau hauv cov tshuaj uas muaj ions ntawm lwm cov hlau (xws li lub ntiaj teb tsis tshua muaj cov ntsiab lus thiab qee cov hlau tsis zoo), thiab pauv lwm cov hlau ions nrog Na nyob rau hauv kev tswj cov concentration, kub, thiab pH.