Calcium Chloride Desiccant

Montmorillonite av nplaum yog ib txwm tshwm sim adsorbent tsim los ntawm kev tswj kom qhuav ntawm magnesium aluminium silicate ntawm sub-bentonite hom. Cov av nplaum no yuav ua tiav rov qab siv dua ntawm qhov kub thiab txias yam tsis muaj kev puas tsuaj loj lossis o. Txawm li cas los xij, cov cuab yeej no ua rau av nplaum muab cov dej noo nkag rov qab rau hauv lub thawv thaum kub nce.

Av nplaum yog ib qho yooj yim desiccant uas ua haujlwm txaus siab hauv qab 120 degree F (kwv yees li 50 degree). Tshaj li 120 degree F, muaj qhov ua tau tias cov av nplaum yuav tso cov dej noo ntau dua li rub nws, yog li kev cia siab cia thiab kev thauj mus los yuav tsum tau txiav txim siab. Lub upside rau av nplaum yog tias nws ib txwm yog qhov tsawg tshaj plaws desiccant ib phaus.

Av nplaum yog zoo heev nyob rau hauv ib txwm kub thiab txheeb ze humidity ranges. Nws cov tsos yog cov me me grey pellets. Kev saib xyuas yuav tsum tau ua kom paub tseeb tias cov khoom qis qis hauv cov av nplaum tsis sib haum nrog cov khoom ntim.

Silica gel yog silicon dioxide (SiO2). Nws yog ib qho ntxhia tshwm sim uas tau ua kom huv thiab ua tiav rau hauv daim ntawv granular lossis beaded. Raws li ib tug desiccant, nws muaj qhov nruab nrab qhov pore loj ntawm 24 angstroms thiab muaj ib tug muaj zog affinity rau ya raws molecules. Cov silica gel yuav rub hauv cov dej noo ntawm qhov kub txog 220 degree F (105 degree). Raws li qhov kub siab tshaj 100 degree F, tus nqi ntawm noo noo tuaj yeem qeeb tab sis cov silica gel tseem yuav ua haujlwm.

Silica gel ua tau zoo tshaj plaws nyob rau hauv chav tsev kub (70 degree rau 90 degree F) thiab high humidity (60 mus rau 90% RH) thiab yuav tso cov txheeb ze av noo nyob rau hauv ib lub thawv mus rau ib ncig ntawm 40% RH. Hauv Tebchaws Meskas, silica gel feem ntau yog siv rau hauv cov khoom noj thiab tshuaj siv raws li tsuas yog silica gel tau pom zoo los ntawm FDA rau kev sib cuag ncaj qha nrog cov khoom no.

Raws li nrog av nplaum, silica gel, nrog nws qhov ntau ntawm qhov pore qhov ntau thiab tsawg, muaj peev xwm ntawm adsorbing compounds uas tsis yog dej. Tus txheeb ze kev txiav txim ntawm adsorbability yog: dej, ammonia, cawv, aromatics, diolefins, olefins thiab paraffins. Thaum lub peev xwm rau multicomponent adsorption yog tam sim no, cia siab tias yuav muaj zog adsorbed ntau dua, xws li dej, kom tshem tawm cov tsis muaj zog.

Qhia silica gel yog silica gel hlaws los yog granule uas tau ntxuav nrog ib tug concentration ntawm cobalt chloride (ib tug hnyav hlau ntsev). Cov cobalt chloride yog xim xiav sib sib zog nqus thaum nws qhuav thiab hloov los ntawm xiav mus rau ntshav mus rau liab dawb li nws tau saturated nrog noo noo. Feem ntau, cov xim hloov thaum lub desiccant mus dhau 8% noo noo theem (los ntawm qhov hnyav) thiab qhia tias nws yog lub sij hawm los hloov cov desiccant.

Qhov feem ntau raug siv rau qhov qhia txog silica gel yog rau cov khoom siv dej noo uas yuav raug tshuaj xyuas tsis tu ncua raws li nws muab qhov pom tseeb ntawm qhov ua tau zoo. Vim yog qhov sib ntxiv ntawm cobalt chloride, qhia tias silica gel yuav tsum tsis txhob siv rau hauv kev sib cuag nrog cov khoom siv xws li khoom noj lossis tshuaj.

Molecular sieve yog qhov zoo tshaj plaws desiccant raws li kev ua haujlwm zoo. Nws muaj peev xwm adsorb noo noo, nyob rau hauv cov ntaub ntawv no dej vapor, yog li pronounced hais tias nws yuav tshem tau daig H20 molecules los ntawm ib tug tag nrho saturated silica gel hlaws, uas nyob rau hauv lem hloov cov silica gel rov qab mus rau nws thawj Cobalt xiav xim.

Molecular sieves yog hluavtaws porous crystalline aluminosilicates uas tau raug tsim los kom muaj kev sib raug zoo heev rau cov me me me me. Lub ntsiab feature ntawm molecular sieve qauv, piv rau lwm yam desiccant medias, yog lub uniformity ntawm pore loj qhib.

Calcium oxide yog calcinated los yog recalcinated txiv qaub uas muaj cov av noo adsorptive peev tsis tsawg dua 28.5% los ntawm qhov hnyav. Qhov txawv feature ntawm calcium oxide (tseem hu ua quicklime) yog tias nws yuav adsorb ntau npaum li cas ntawm cov dej vapor ntawm tus txheeb ze cov av qis tshaj li lwm yam ntaub ntawv. Nws yog qhov ua tau zoo tshaj plaws yog qhov tseem ceeb ntawm cov av noo tseem ceeb yog qhov tsim nyog, thiab yog tias muaj qhov siab ntawm cov dej vapor tam sim no.

Calcium oxide tshem tawm cov dej los ntawm ib pob maj mam, feem ntau siv hnub kom ncav cuag nws lub peev xwm siab tshaj plaws. Raws li calcium oxide adsorbs noo noo, nws swells. Kev ntim desiccant kom zoo yog xav tau rau kev siv tau zoo. Rau cov laj thawj no, nws txoj kev siv tau raug txwv rau feem ntau ntim cov khoom noj dehydrated.

Calcium sulfate (zoo dua lub npe hu ua DrieriteT) yog tsim los ntawm kev tswj lub cev qhuav dej ntawm gypsum. Nws yog lub hom phiaj dav dav desiccant npaj rau kev siv hauv chav kuaj. Nws yog tshuaj lom neeg ruaj khov, tsis sib cais, tsis muaj tshuaj lom, tsis muaj corrosive thiab tsis tso nws cov dej adsorbed yooj yim thaum raug rau qhov kub thiab txias.

Tus nqi qis ntawm calcium sulfate yuav tsum tau hnyav rau nws qhov sib npaug tsis muaj peev xwm adsorptive; Nws tsuas yog adsorbs txog li 10% ntawm nws qhov hnyav hauv dej vapor. Calcium sulfate kuj muaj cov yam ntxwv tsim dua tshiab uas zoo li txwv nws lub neej muaj txiaj ntsig. Txawm hais tias muaj, nws tsis yog ib txwm muag hauv daim ntawv pob.