Oxygen absorbents, raws li cov ntaub ntawv tseem ceeb rau kev tswj cov pa oxygen concentration hauv ib puag ncig, muaj kev siv dav hauv kev khaws zaub mov, chaw muag tshuaj, kev tiv thaiv hluav taws xob, thiab kev tiv thaiv kev lag luam. Lawv lub luag haujlwm tseem ceeb yog kom ceev cov pa oxygen dawb hauv qhov chaw kaw los ntawm cov tshuaj tiv thaiv, yog li ua kom cov txheej txheem oxidation qeeb thiab txuas ntxiv lub neej txee lossis tswj kev ua haujlwm ntawm cov khoom lag luam. Txawm li cas los xij, qhov ua tau zoo ntawm cov pa oxygen absorbent yog cuam tshuam los ntawm ntau yam, suav nrog kev xaiv cov khoom, ib puag ncig, kev ntim khoom sib xws, thiab kev siv. Kev paub txog kev tshawb fawb thiab cov tswv yim tuaj yeem txhim kho lawv cov txiaj ntsig siv tau zoo.
Kev sib txuam ntawm cov khoom siv thiab cov txheej txheem ntawm kev ua
Oxygen absorbents feem ntau muab faib ua ob pawg: hom tshuaj lom neeg thiab hom catalytic decomposition. Txoj kev nqus tshuaj tshem tawm cov pa oxygen los ntawm cov tshuaj tiv thaiv redox ntawm cov khoom xyaw xws li hlau hmoov (xws li, oxygen absorbers), sulfites, los yog ascorbic acid. Hlau -raws li cov pa oxygen absorbers yog cov kev xaiv tseem ceeb vim lawv cov nqi qis thiab kev ua haujlwm siab (kev xav, lawv tuaj yeem ua tiav cov pa nqus pa ntau dua 21% ntawm chav tsev kub). Catalytic decomposition txoj kev cia siab rau cov khoom siv hlau muaj txiaj ntsig (xws li platinum, palladium) lossis cov hlau tshwj xeeb oxides (xws li manganese dioxide) kom nrawm cov tshuaj tiv thaiv ntawm cov pa oxygen thiab cov organic teeb meem, ua rau lawv tsim nyog rau cov khoom seem (piv txwv li, ntim tshuaj).
Hauv kev siv tswv yim, cov khoom siv yuav tsum raug xaiv raws li cov yam ntxwv ntawm lub hom phiaj ib puag ncig. Piv txwv li, cov khoom ntim khoom noj tseem ceeb tshaj qhov tsis muaj ntxhiab tsw hlau-raws li cov pa oxygen absorbers yam tsis muaj teeb meem los ntawm cov khoom, thiab siv cov desiccants los tswj cov av noo (hlau hmoov tshuaj tiv thaiv yuav tsum tau ya raws). Siab - cov kws tshuaj muaj txiaj ntsig zoo li siv cov khoom siv catalytic kom tsis txhob qhia cov impurities. Tsis tas li ntawd, txoj kev loj hlob ntawm cov ntaub ntawv tshiab sib xyaw (xws li, txhawb nano- hlau hmoov lossis bio- enzyme systems) yog maj mam nthuav lawv cov kev siv nyob rau hauv huab cua (xws li, tsis tshua muaj kub, high humidity).
Kev tswj hwm ntawm ib puag ncig tsis zoo yog qhov tseem ceeb. Qhov ua tau zoo ntawm cov pa oxygen absorbers yog nyob ntawm qhov kub thiab txias, av noo, thiab qhov pib oxygen concentration. Rau txhua txhua 10℃qhov kub thiab txias, cov tshuaj tiv thaiv ntawm hlau-raws li deoxidizers tuaj yeem nce 1.5-2 zaug. Txawm li cas los xij, qhov kub siab tshaj 40℃tuaj yeem ua rau cov khoom ntim khoom deformation lossis tsis ua haujlwm ntxov ntxov. Thaum txheeb ze av noo qis dua 30%, ib zaj duab xis passivation yooj yim tsim rau saum npoo ntawm cov hmoov hlau, cuam tshuam cov tshuaj tiv thaiv. Nyob rau hauv rooj plaub no, nws yog ib qho tsim nyog yuav tau ntxiv cov khoom siv desiccant xws li calcium chloride kom muaj cov av noo zoo tagnrho ntawm 60% -80%. Rau cov xwm txheej uas muaj cov pa oxygen siab pib (xws li cov thawv ntim ntim tshiab), nws raug nquahu kom ua kom cov txheej txheem deoxygenation pib los ntawm kev tso cov khoom nqus los yog ua kom ntau npaum li cas.
Nws yog tsim nyog sau cia tias qee qhov absorbents yuav nkag mus rau "lub xeev dormant" nyob rau hauv qis qis oxygen (<0.1%). In this case, the oxygen permeability rate can be adjusted through a microporous breathable membrane design to maintain the absorbent's continuous activity. Experimental data shows that when the oxygen permeability (OTR) of the packaging material is controlled within the range of 1-5 cc/m²·24h, with an absorbent dosage of 0.5-1 g/L of space volume, the oxygen concentration in a sealed container can be reduced to below 0.01% within 24 hours.
Synergistic Optimization ntawm Ntim System thiab Dosing Txheej txheem
Kev ua tau zoo ntawm cov pa oxygen absorbent tsis yog nyob ntawm cov khoom siv xwb tab sis kuj nyob ntawm kev tsim tag nrho ntawm lub ntim system. Ua ntej, cov khoom nqus dej yuav tsum raug cais tawm ntawm lub cev los ntawm cov khoom tiv thaiv (feem ntau yog los ntawm cov hnab tsis yog-cov ntaub qhwv los yog cov pa ua pa) kom tsis txhob muaj kev sib cuag ncaj qha uas tuaj yeem ua rau muaj kev sib kis lossis cov tshuaj tiv thaiv catalytic. Qhov thib ob, qhov airtightness ntawm lub thawv ntim khoom yog qhov tseem ceeb heev - tej yam me me yuav cia cov pa tawm sab nraud kom tsis tu ncua nkag mus rau hauv, ua rau lub cev nqus dej deoxygenation. Nws raug nquahu kom siv ntau- txheej cov ntaub ntawv sib xyaw (xws li aluminium foil composite polyethylene) ua ke nrog cov cua sov- sealing thev naus laus zis los xyuas kom meej tias cov pa permeability ntawm lub thawv yog qis dua 0.1 cc / m²·24h thaum khaws cia.
Hais txog cov txheej txheem dosing, qhov kev tso kawm absorbent yuav tsum tau muab faib raws li lub ntim ntim thiab cov duab. Rau kev ntim khoom loj (xws li lub hnab ntim rau cov nplej cia), ib qho kev sib cais ntau -point dosing lub tswv yim tuaj yeem siv tau; rau me me, precision ntim (xws li ya raws - cov hnab pov thawj rau cov khoom siv hluav taws xob), nws raug nquahu kom tso cov khoom nqus dej rau hauv qhov chaw nruab nrab ntawm cov roj ntws. Tsis tas li ntawd, nyob rau hauv qee qhov xwm txheej, lub tshuab nqus tsev pretreatment (kom pib txo cov pa oxygen hauv lub thawv kom qis dua 1%) yog qhov tsim nyog ua ntej siv cov nqus dej kom luv lub sij hawm qhov rais kom ncav cuag lub hom phiaj oxygen concentration.
Dynamic Management Strategy rau Kev Saib Xyuas thiab Saib Xyuas
Txawm tias muaj cov khoom nqus tau zoo, cov pa oxygen hloov pauv tseem yuav tsum tau saib xyuas tsis tu ncua thaum lub sijhawm ntev - khaws cia. Portable oxygen sensors (nrhiav txwv 0.001%) lossis colorimetric pa taw qhia daim npav (uas pom pom cov ntsiab lus oxygen los ntawm kev hloov xim) feem ntau siv cov cuab yeej saib xyuas. Yog tias pom tias qhov rov qab los ntawm cov pa oxygen concentration, cov teeb meem xws li kev puas tsuaj ntawm cov ntim khoom, kev nqus dej saturation (qhov hnyav nce li ntawm 25% -30% tom qab ua tiav oxidation ntawm cov hmoov hlau) lossis qhov txawv txav ntawm ib puag ncig kub thiab av noo yuav tsum tau tshawb xyuas, thiab cov absorbent yuav tsum tau hloov los yog ntxiv tam sim ntawd.
Rau cov ntawv thov tshwj xeeb (xws li cov cabins kaw hauv qhov sib sib zog nqus- cov cuab yeej siv dej hiav txwv lossis lub neej txhawb nqa rau lub dav hlau), qhov ntev - lub sijhawm ruaj khov ntawm cov nqus dej thiab nws cov khoom pov tseg tsis zoo tom qab ua tsis tiav yuav tsum tau txiav txim siab. Qee cov khoom siv siab- kawg txuas ntxiv cov khoom nqus tau lub neej txee rau 12-24 lub hlis los ntawm kev ntxiv pH buffers lossis qeeb-tso desiccants, thaum tib lub sijhawm txo cov kev cuam tshuam ib puag ncig.
Daim ntawv thov cov pa oxygen absorbents yog ib qho kev tsim qauv tsim ua ke nrog cov ntaub ntawv science, ib puag ncig engineering, thiab ntim tshuab. Los ntawm cov khoom sib txuam ua tau zoo, kev ua kom zoo ib puag ncig tsis zoo, txhim kho kev ntim khoom, thiab ua raws li kev saib xyuas zoo, lawv cov pa tshem tawm cov pa tawm tuaj yeem ua kom tiav, muab kev txhawb nqa zoo rau kev ruaj ntseg ntawm ntau yam khoom. Nrog rau kev nce qib hauv cov ntaub ntawv sib xyaw tshiab thiab kev soj ntsuam cov thev naus laus zis, daim ntawv thov scenarios rau oxygen absorbents yuav nthuav dav ntxiv, thiab lawv cov txiaj ntsig thev naus laus zis yuav nce ntxiv.
