molecular sieve yog cov khoom ntxeem tau uas muaj qhov me me, tsis sib xws. Nws ua haujlwm zoo li chav ua noj sieve, tshwj tsis yog ntawm cov nplai molecular, cais cov roj sib tov uas muaj ntau qhov loj me me. Tsuas yog cov molecules me dua li qhov pores tuaj yeem dhau mus; whereas, loj molecules raug thaiv. Yog tias cov molecules koj xav cais yog tib qhov loj, lub molecular sieve kuj tuaj yeem cais los ntawm polarity. Sieves yog siv nyob rau hauv ntau yam kev siv raws li noo noo tshem tawm desiccants thiab pab tiv thaiv degradation ntawm cov khoom.
Hom Molecular Sieves
Molecular sieves tuaj ntau hom xws li 3A, 4A, 5A thiab 13X. Cov lej lej txhais qhov loj ntawm qhov pore thiab cov tshuaj muaj pes tsawg leeg ntawm lub sieve. Cov ions ntawm poov tshuaj, sodium, thiab calcium yog hloov nyob rau hauv muaj pes tsawg leeg los tswj qhov loj ntawm lub pore. Muaj ntau tus xov tooj ntawm meshes nyob rau hauv sib txawv sieves. Ib qho molecular sieve nrog ib tug me me meshes yog siv los cais gases, thiab ib tug nrog ntau meshes yog siv rau cov kua. Lwm yam tseem ceeb ntawm molecular sieves muaj xws li daim ntawv (hmoov los yog hlaws), bulk ntom, pH qib, regeneration kub (ua kom sov), noo noo, thiab lwm yam.
Molecular Sieve vs. Silica Gel
Silica gel kuj tseem siv tau los ua cov dej noo tshem tawm cov desiccant tab sis txawv heev los ntawm molecular sieve. Cov yam ntxwv sib txawv uas tuaj yeem txiav txim siab thaum xaiv ntawm ob yog cov kev xaiv sib dhos, kev hloov pauv hauv siab, qib noo noo, cov neeg kho tshuab quab yuam, qhov kub thiab txias, thiab lwm yam. Qhov sib txawv tseem ceeb ntawm molecular sieve thiab silica gel yog:
Tus nqi ntawm adsorption ntawm molecular sieve yog ntau dua li ntawm silica gel. Qhov no yog vim lub sieve yog ib tug ceev ceev-drying neeg sawv cev.
Lub sieve molecular ua haujlwm zoo dua li silica gel nyob rau hauv qhov kub thiab txias, vim nws muaj cov qauv zoo sib xws uas khi cov dej khov kho.
Ntawm qhov txheeb ze humidity tsawg, lub peev xwm ntawm molecular sieve yog zoo dua li ntawm silica gel.
Cov qauv ntawm lub sieve molecular yog txhais thiab muaj cov pores zoo li qub, thaum cov qauv ntawm silica gel yog amorphous thiab ntau qhov pores tsis zoo.
Yuav Ua Li Cas Activate Molecular Sieves
Txhawm rau qhib molecular sieves, qhov tseem ceeb yuav tsum tau raug rau qhov kub siab tshaj plaws, thiab cua sov yuav tsum siab txaus rau cov adsorbate kom vaporize. Qhov ntsuas kub yuav txawv nrog cov khoom siv adsorbed thiab hom adsorbent. Qhov ntsuas kub tsis tu ncua ntawm 170-315oC (338-600oF) yuav xav tau rau hom sieves tau tham ua ntej. Ob qho tib si cov khoom raug adsorbed, thiab cov adsorbent yog cua sov ntawm qhov kub no. Lub tshuab nqus tsev ziab yog txoj hauv kev sai dua ntawm kev ua qhov no thiab yuav tsum muaj qhov kub qis dua piv rau cov nplaim ziab.
Thaum ua haujlwm, cov sieves tuaj yeem muab khaws cia rau hauv lub khob ntim nrog ob txheej txheej parafilm. Qhov no yuav ua rau lawv qhib tau mus txog rau lub hlis. Txhawm rau xyuas seb cov sieves puas ua haujlwm, koj tuaj yeem tuav lawv hauv koj txhais tes thaum hnav hnab looj tes thiab ntxiv dej rau lawv. Yog tias lawv ua haujlwm tag nrho, ces qhov kub nce siab, thiab koj yuav tsis tuaj yeem tuav lawv txawm tias hnav hnab looj tes.
Kev siv cov khoom siv kev nyab xeeb xws li PPE cov khoom siv, hnab looj tes, thiab tsom iav kev nyab xeeb yog pom zoo raws li cov txheej txheem ntawm kev ua kom cov molecular sieves cuam tshuam nrog kub thiab tshuaj lom neeg, thiab cov kev pheej hmoo cuam tshuam.
Post lub sij hawm: May-30-2023
