Cov yam ntxwv ntawm 4A Molecular Sieves
Lub pore txoj kab uas hla ntawm 4A molecular sieve yog kwv yees li 4 Å (0.4 nm), uas yog lub hauv paus chiv keeb ntawm nws lub npe "4A". Qhov tshwj xeeb qhov pore loj no txiav txim siab tias nws tuaj yeem nqus cov molecules ntawm qee qhov loj, tab sis tsis tuaj yeem nqus cov molecules nrog txoj kab uas hla loj dua qhov loj no. Vim nws cov qauv microporous tshwj xeeb, 4A molecular sieve muaj thaj chaw loj tshwj xeeb, uas muab nws nrog ntau qhov chaw adsorption thiab ua rau nws muaj peev xwm adsorption muaj zog. Piv rau lwm hom adsorbents, 4A molecular sieve tseem muaj peev xwm nqus dej siab txawm tias qhov kub siab dua, qhov chaw loj dua, thiab cov dej noo tsawg. Ntxiv mus, Na + ions nyob rau hauv lub pores ntawm 4A molecular sieve tuaj yeem pauv los ntawm lwm cov hlau cations, yog li muaj kev sib pauv ion zoo heev.
Daim ntawv thov
1, Detergent additive
2, Kev kho dej khib nyiab
Kev nqus dej ntawm NH3-N
Adsorption ntawm hnyav hlau ions
3, Catalysis teb
4A molecular sieves catalyzes N-tert-butoxycarbonylation cov tshuaj tiv thaiv nyob rau hauv chav tsev kub thiab hnyav-dawb tej yam kev mob. 4Ib molecular sieve kuj txhawb cov kev tshwm sim xws li lub nplhaib contraction ntawm hindered aromatic nitriles thiab cyclic diketones.
4, Muaj adsorption
Qhov zoo ntawm qhov pore loj ntawm 4A molecular sieve yog kwv yees li 0.42 nm, uas tuaj yeem nqus tau cov molecules zoo nrog polarity thiab molecular dynamic diameters tsawg dua 0.4 nm, xws li dej, hydrogen sulfide, sulfur dioxide, carbon dioxide, thiab lwm yam. Raws li ib qho tseem ceeb desiccant, 4A molecular sieve roj muaj ntau yam khoom siv tau zoo heev. ncua lub sij hawm cia ntawm cov roj. Tshwj xeeb tshaj yog rau cov khoom siv roj uas muaj leej faj, sib tov ib qho kev faib ua feem ntawm 4A molecular sieve thiab 13 molecular sieve tuaj yeem ua tiav lub cev qhuav dej thiab desulfurization ntau dua . 4Ib lub sieve molecular kuj siv tau rau lub cev qhuav dej ntawm cov kua ethanol. Piv txwv li, qhov concentration ntawm 96% kua ethanol tuaj yeem nce mus rau ntau dua 99% tom qab dhau los ntawm 4A molecular sieve packed kem . 4A molecular sieve kuj tuaj yeem siv rau hauv cov txheej txheem ntawm refining argon roj. Ntawm qhov kub thiab txias, 4A molecular sieve tuaj yeem txo cov pa oxygen concentration. Ntxiv mus, daim ntawv thov lub cev qhuav dej ntawm 4A molecular sieve yog dav heev. Piv txwv li, nyob rau hauv kev tsim cov khoom siv hluav taws xob thiab cov cuab yeej siv hluav taws xob ntau lawm, siv 4A molecular sieve rau cov cua qhuav tuaj yeem txo cov av noo thiab ua kom cov dryness ntawm qhov chaw tsim khoom. Hauv kev lag luam tshuaj thiab tshuaj zoo, ntau cov kuab tshuaj organic yuav tsum tau kho kom qhuav ua ntej siv kom tshem tawm cov dej noo . 4Lub sieve molecular tuaj yeem nqus dej noo hauv cov kuab tshuaj organic, xws li ethanol thiab methanol, txhawm rau txhim kho cov purity thiab zoo ntawm cov kuab tshuaj organic. 4Molecular sieve tuaj yeem muab ntxiv rau cov xim molecular, thiab tshem tawm cov xim dej kom zoo dua, thiab tshem tawm cov xim zoo nkauj. stability thiab ziab ceev ntawm cov khoom.
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