Desiccants ua lub luag haujlwm tseem ceeb hauv kev tswj cov khoom zoo thiab kev ruaj ntseg los ntawm kev nqus dej noo thiab tawm tsam cov teeb meem xws li corrosion, pwm, thiab degradation los ntawm cov av noo. Hauv tsab xov xwm no, peb yuav ua tib zoo saib ob lub npe nrov desiccants - activated alumina thiab silica gel, tshuaj xyuas lawv cov yam ntxwv tshwj xeeb, cov txiaj ntsig, thiab kev txwv.
Activated alumina yog ib daim ntawv ntxeem tau ntawm txhuas oxide uas paub txog nws qhov tshwj xeeb adsorption zog. Nws yog dav siv nyob rau hauv industrial qhuav daim ntaub ntawv vim nws muaj peev xwm tshem tawm noo noo los ntawm huab cua thiab gases. Nws qhov loj ntawm thaj chaw thiab qhov porosity siab ua rau nws muaj txiaj ntsig zoo rau kev tswj xyuas cov khoom zoo xws li tshuaj, khoom siv hluav taws xob, thiab tshuaj lom neeg. Txawm li cas los xij, ib qho ntawm cov kev txwv ntawm activated alumina yog tias nws tuaj yeem tso tawm cov cua sov ntau thaum lub sij hawm adsorption txheej txheem, uas tej zaum yuav tsis haum rau qee yam kev siv.
Ntawm qhov tod tes, silica gel yog cov khoom siv hluavtaws uas yog tsim los ntawm silicon dioxide. Nws yog lub npe hu rau nws qhov chaw siab thiab muaj zog affinity rau cov dej molecules, ua rau nws muaj zog noo noo adsorbent. Silica gel feem ntau pom nyob rau hauv cov pob khoom hauv cov khoom ntim kom cov khoom qhuav thiab tsis muaj dej puas. Nws kuj tseem siv los tiv thaiv cov khoom siv hluav taws xob, lub koob yees duab, thiab cov khoom tawv thaum lub sijhawm khaws cia thiab kev thauj mus los. Txawm hais tias nws muaj txiaj ntsig zoo, silica gel muaj peev xwm adsorption tsawg thiab yuav tsum tau hloov lossis rov tsim dua tshiab.
Ob qho tib si activated alumina thiab silica gel muaj lawv tus kheej lub zog thiab tsis muaj zog thaum nws los txog rau ya raws adsorption. Thaum activated alumina yog qhov tsim nyog rau kev ziab thiab kev siv loj, silica gel yog qhov zoo dua rau cov khoom me me thiab muag heev. Kev nkag siab txog qhov txawv ntawm cov desiccants no yog qhov tseem ceeb rau kev xaiv qhov tsim nyog rau cov teeb meem tshwj xeeb txog kev ya raws.
Ntxiv nrog rau lawv cov yam ntxwv sib txawv, ob qho tib si desiccants muaj cov txheej txheem sib txawv ntawm cov dej noo adsorption. Activated alumina ua haujlwm los ntawm cov txheej txheem hu ua physisorption, qhov twg cov dej molecules yog lub cev adsorbed rau saum npoo ntawm desiccant. Ntawm qhov tod tes, silica gel siv kev sib xyaw ua ke ntawm lub cev adsorption thiab capillary condensation txhawm rau txhawm rau ya raws hauv nws qhov pores. Kev nkag siab txog cov txheej txheem no yog qhov tseem ceeb rau kev txhim kho kev ua haujlwm ntawm cov desiccants hauv ntau daim ntawv thov.
Tsis tas li ntawd, cov desiccants no pom kev siv dav hauv ntau qhov kev lag luam. Activated alumina yog dav siv nyob rau hauv qhuav ntawm compressed cua thiab gases, raws li zoo raws li nyob rau hauv lub purification ntawm cov kua xws li propane thiab butane. Nws kuj tseem siv rau hauv kev ziab ntawm cov kuab tshuaj thiab tshem tawm cov impurities los ntawm cov pa roj. Silica gel, ntawm qhov tod tes, feem ntau yog siv los tiv thaiv cov khoom siv hluav taws xob rhiab heev, tiv thaiv xeb thiab xeb hauv phom, thiab khaws cov ntaub ntawv tseem ceeb thiab cov duab kos.
Hauv kev xaus, ob qho tib si qhib alumina thiab silica gel desiccants ua lub luag haujlwm tseem ceeb hauv kev tswj cov khoom zoo thiab kev ruaj ntseg los ntawm kev tiv thaiv cov teeb meem ntsig txog dej. Txhua tus desiccant muaj nws tus yam ntxwv tshwj xeeb, cov txiaj ntsig, thiab kev txwv, ua rau lawv tsim nyog rau kev siv sib txawv. Nkag siab txog cov qauv, cov txheej txheem ntawm kev nqus dej noo, thiab kev siv cov desiccants no yog qhov tseem ceeb rau kev siv lawv hauv ntau yam lag luam. Txawm hais tias nws yog kev lag luam ziab lossis kev tiv thaiv cov khoom siv hluav taws xob, txoj cai desiccant tuaj yeem ua qhov sib txawv tseem ceeb hauv kev tswj xyuas cov khoom zoo thiab zoo.
Post lub sij hawm: Mar-07-2024
