Cov alumina ua kom nquag thiab cov molecular sieve, lawv zoo sib xws (lawv ob leeg muaj cov duab me me zoo li lub voj voog), lawv ua tib yam txheej txheem (lawv nqus cov khoom ntawm qib molecular), thiab lawv ob leeg muaj cov khoom siv rov ua dua tshiab (koj tuaj yeem siv cov khoom siv dua thaum cov desiccant muaj peev xwm) tab sis lawv yog ob yam khoom sib txawv kiag li. Yog li ntawd, lo lus nug yog, nrog ntau yam zoo sib xws, lawv txawv li cas?
Qhov lawv ua los ntawm yog qhov pib zoo. Cov alumina ua kom nquag yog ua los ntawm txhuas oxide uas muaj qhov ntxeem tau ntau, thaum cov molecular sieve yog ua los ntawm cov hlau crystalline alumino-silicates. Qhov no txhais tau tias cov qhov hws ntawm cov molecular sieve tuaj yeem ua rau hauv qhov ntau thiab tsawg tshwj xeeb feem ntau pom tias yog 3A, 4A, 5A, thiab 13X, qhov twg cov qhov hws ntawm cov alumina ua kom nquag tsis muaj qhov ntsuas tshwj xeeb. Qhov no txhais tau tias cov molecular sieve tuaj yeem siv los cais qee cov molecules ntawm qhov ntau thiab tsawg tshwj xeeb ntawm ib leeg, piv txwv li tshem tawm ammonia ntawm cov roj av.
Los ntawm qhov pom ntawm daim ntawv thov, ntawm no yog lawv txawv li cas. Cov alumina ua kom muaj zog heev, nws tuaj yeem nqus dej ntau dua li cov molecular sieve, qhov no ua rau nws yog cov khoom siv tau zoo heev hauv cov tshuab cua lossis rau qee yam kev siv roj av. Qhov ruaj khov ntawm cov khoom siv ua rau nws tiv taus ntau qhov siab nrog rau cov av noo siab.
Alumina uas ua kom nquag tsis tuaj yeem nqus tau ntau yam khoom siv lossis cais qee cov molecule ntawm ib leeg zoo li cov molecular sieves ua tau, ua rau nws tsis ua haujlwm zoo li ethanol dehydration. Qhov no yog vim tias activated alumina yuav tuaj yeem nqus tau ob qho tib si ethanol thiab dej molecule thiab yog li ntawd yuav tsis muaj kev sib cais tshwm sim.
Tej zaum lub molecular sieve yuav tsis muaj peev xwm nqus dej ntau npaum li cas tab sis yog tias koj xav tau txo cov dej kom tsawg heev, txog li 0.1ppm, molecular sieve yuav yog koj qhov kev xaiv nqus vim tias qhov no yog qee yam uas lwm cov adsorbents ntxiv rau molecular sieve tsis tau ua.
Cov molecular sieve kuj tseem siv tau los cais cov molecules tshwj xeeb ntawm ib leeg, vim yog kev hloov kho ntawm lawv qhov loj me. Piv txwv li koj tuaj yeem cais dej ntawm ethanol, thiab carbon dioxide, ammonia, thiab cov hydrocarbons loj dua los ntawm cov roj av, uas yog ib yam dab tsi uas activated alumina ua tsis tau, lossis yuav tsis ua haujlwm zoo ib yam.
Lub sijhawm tshaj tawm: Lub Yim Hli-05-2019