Vim kev ua haujlwm sib koom los ntawm tib neeg ntau lawm thiab cov haujlwm txhua hnub, cov kev siv tshuab hluav taws xob tau nce los ntawm 280 PPMV hauv 2005, thiab tus duab no tau nce mus rau 390 PPMV2Cov. Raws li qhov cuam tshuam ntawm kev nce qib kev nce qib zuj zus, kev txhim kho ntawm lub ntsiab lus CU kho thev naus laus zis hauv zej zog tshuaj. Kev ntes Cook tam sim no feem ntau suav nrog kev haum, kev kos npe, thiab membrane sib cais. Ntawm lawv, txoj kev nqus tau yog muab faib ntxiv ua lub cev nqus dej thiab tshuaj haum:
Kev nqus lub cev siv siab-boiling-taw tes cov kuab tshuaj (piv txwv li ethathylene glycol) kom haum thiab txias, yog li ua tiav kev sib cais.
Tshuaj Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nruab Nrab thiab cov nqus tau kom ntes tau Co.
Cov qauv Adsorption tau tawm los ua kev cuam tshuam ntau dhau los vim nws qhov zoo ntawm cov txheej txheem yooj yim, yooj yim ntawm kev siv tshuab, thiab tsis corroseness. Daim mem tes sib cais qauv cais sib cais los ntawm cov khoom sib txawv ntawm cov ntawv sau ua ke. Cov pawg amino tau thov ze rau txhua qhov ntawm txoj kev ncaj ncees saum toj no. Qhov kev kawm no xyuas cov kev siv cov amino pab pawg hauv kev nqus, kev sib cais ntawm lawv lub luag haujlwm hauv lawv lub luag haujlwm hauv kev kos npe raws li kev kos npe.
Ntsiab lus:amino hloov kho, ntes, adsorbent
Txoj kev rau kev nqus CO2 nrog cov dej cawv
Cov dej cawv uas cov dej cawv yog qhov muaj feem ntau thiab ua tau zoo dua rau kev nqus pa coo2 hauv kev siv cov ntawv thov. Dej cawv txiv hmab txiv ntoo muaj tsawg kawg yog ib pawg hydroxyl uas tuaj yeem txo cov pab pawg hauv siab, thiab cov pab pawg hydroxyl kuj tseem tuaj yeem muab cov kev tsim nyog alkaline; Cov dej cawv amine Molecule yuav tsum muaj cov amino pab pawg uas tuaj yeem txhawb kev nqus cov roj acidic.
Tam sim no, txoj kev tshawb fawb txog txoj kev haus cawv rau kev nqus dej cawv rau cov txheej txheem kev nqus ntawm cov txheej txheem ntawm kev hloov pauv ntawm huab hwm coj ntawm txoj kev nqus. Ib qho khoom siv roj-kua ua kua tau ntxiv rau cov txheej txheem ntawm DEA AVE ntawm cov roj thiab kua theem hloov chaw ntawm cov roj thiab kua theem. Thaum cov roj av roj nplawm nce ntxiv los ntawm 50R / min txog 200 min, qhov loj hloov cov coefficiecic tau nce los ntawm 0.0154 kmol / (S · m2· MPA) mus rau 0.021 kmol / (Ben · M2Mpapa), muaj kev nce 3533%. Thaum cov kua theem ua kua loj nce los ntawm 150r / min mus rau 300r / min, tus txheeb ze hloov kev nce qib ntawm 0.009 kmol / (S · · m2· MPA) mus rau 0.021 kmol / (Ben · M2GPA), muaj ze li ntawm 134%. Cov kev sim tau pom tias ntxiv cov khoom siv roj ua kua roj av tau tuaj yeem txhim kho qhov muaj peev xwm hloov tau loj dua, yog li txhim kho qhov kev nqus tau ntawm CO2.
Ntxiv nrog rau nws qhov muaj peev xwm siab nqus, qhov nqus tau ntawm CO2 los ntawm cov dej cawv cawv kuj muaj qee qhov tsis xws luag:
(1) Nws yog qhov nyuaj cais cov dej cawv los ntawm CO2 tom qab ua ke nrog nws, thiab nws yuav tsum tau sib cais ntawm qhov kub siab, uas tau noj ntau lub zog;
(2) Cov dej cawv cawv yuav ua rau muaj kev xeb hnyav;
(3) Amine daws tau yooj yim rau kev loj hlob thaum lub sij hawm desorption, uas txo nws lub peev xwm los nqus rau CO2;
(4) Amine daws tau yooj yim rau yauv taws teeb meem thiab oxidative tsis zoo thaum lub sij hawm CO2 desorition, uas txo nws qhov peev xwm nqus tau rau CO2. Nws yog qhov meej meej vim hais tias ntawm qhov tsis xws luag saum toj no yog kev siv cov txheej txheem dej cawv uas tuaj yeem kawm cov qauv dej cawv, thiab cov amino hloov adsorbent.
Txoj kev rau Adsorbing CO2 siv amino-hloov adsorbent
Tus yuam sij rau cov qauv adsorption yog tus adsorbent. Cov ntaub ntawv tso pa tawm xws li cov lus sicchular, ua kom zoo, thiab lwm yam khoom siv, thiab txhua yam khoom siv tau muaj qhov tsis xws luag. Kev siv cov ntaub ntawv sib xyaw lossis cov hau kev tshiab uas ua ke cov txiaj ntsig tshiab ntawm cov txiaj ntsig ntau yam khoom yuav yog cov qauv hauv kev ntes CO2, thiab muaj lub peev xwm tshawb fawb zoo. Txoj kev kawm no yuav siv amino-regified hlau-organic moj khaum
Amino-Hloov Cov Hlau-Organic moj khaum
Raws li tus adsorbent tshiab rau kev ntes CO2, MOFS muaj cov txiaj ntsig zoo heev tshaj li cov pa roj av, cov pa roj roj, thiab lwm yam) thiab dej cawv amine daws. Ua ntej, lub moj khaum ntawm cov mofs feem ntau yog nruab nrab, yog li cov qhua molecules nyob cov pores tsuas muaj kev sib txuam tsis muaj zog nrog lub cev pob txha. Cov qhua no Molecules tuaj yeem raug tsav tawm ntawm lub cev pob txha pob txha ntawm qhov ntsuas kub qis dua thaum tswj tau kev ncaj ncees ntawm lub cev pob txha. Thib ob, qhov loj me, faib, hydrophilicity, thiab tshuaj lom neeg muaj peev xwm tsim tau ntawm qib mols tuaj yeem hloov lossis hloov kho cov organic ligands thiab hlau ions siv.
Txhawm rau txhim kho nws lub peev xwm los Adsorb CO2, amino-hloov cov hlau organic framewers yog tam sim no feem ntau sib sau ua ke nrog amino pab pawg thiab hlau arrowheads. Qhov quav tau npaj peb MOF cov ntaub ntawv, USO-1-A-2-NI, thiab USO-1-ni-2-ni-2-ni-3-hauv-a). Cov txiaj ntsig ntawm cov co2 adsorption kuaj pom tias lub crystallinity, thiab pore ntim cov ntaub ntawv tau txo kom muaj kev sib txawv, thaum cov txiaj ntsig adsorption tau hloov kho. Noj USO-1-A1 thiab USO-1-AI-A li cov piv txwv, ntawm 25 ANI yog 2.3 hli, thaum twg ntawm USO-1-A tau nce ntxiv rau 2.7mmol / g; Thawj adsorption tshav kub ntawm CO2 nce los ntawm 30kj / mol rau 50kj / mol, uas tau lees paub tias cov ntaub ntawv hloov kho amino tau ua rau muaj kev txhim kho.
Amino-Hloov Mesoporous Cov Ntaub Ntawv
Txawm hais tias hlau-organic framework cov ntaub ntawv thiab molecular sieves yog cov khoom siv adsorption zoo ntawm lub microporous ntawm lub microsorption muaj peev xwm ntawm CO2 rau qee yam. Qee cov ntaub ntawv Sio2 Mesoporous tuaj yeem txo qhov cuam tshuam ntawm cov nyhuv sib txawv no thiab txhim kho qhov muaj peev xwm adsorption. Txawm li cas los xij, qee cov pawg hydroxyl nyob rau ntawm Sio2 ua cov khoom uas tsis tau tshaj nrog CO2. Qhov teeb meem no tuaj yeem kov yeej los ntawm kev sib txuas nrog amino-muaj cov organic sib xyaw nrog cov khoom lag luam ntawm cov khoom siv mesoporous los ntawm impregnation lossis grafting.
50% polyethyleneimine tau thauj khoom rau hauv cov hws ntawm MCM-41 los ntawm Impregnation. Cov adsorption muaj peev xwm ntawm Amine-hloov kho MCM-41 rau Co2 / g ntawm 348K, uas yog siab dua li 78 mg / g tau nrog Silica Gel ua tus neeg nqa khoom.
Amino-hloov kho cov pa roj nanotubes
Nyob rau hauv xyoo tsis ntev los no, kev txhim kho cov ntaub ntawv tshiab tau cuam tshuam rau txhua yam ntawm tib neeg lub neej. Daim ntawv thov ntawm cov pa roj carbon nanotubes hauv kev sib cais roj tau dhau los ua qhov tseem ceeb. Cov Nanotubes muaj cov lej fawm kib tus yam ntxwv, thiab cov kev ncua deb ntawm cov khaubncaws sab nraud povtseg yog conducive rau amino chaw thau khoom.
Tom qab CNTs tau hloov chaw nrog 3-aminopropyltriethysilane (Apts), lawv muaj peev xwm ua tiav thiab thermodynamic cov khoom tau kawm. Thaum qhov ntsuas kub tau teem nyob rau ntawm 50 degree, tsis muaj qhov sib piv ntawm 20%, 45% thiab 54.3mg / g, 60.5mg / g, 74.5mg / g, 85.7mg / g thiab 77mg / g, feem. Cov ntaub ntawv no qhia tau tias vim muaj cov pab pawg AMino nyob hauv Atps, qhia txog Apts ntawm CNTs nto muaj peev xwm txhim kho lub peev xwm ua adsorption. Thiab thaum cov chaw thau khoom ntawm chaw thau khoom yog 45% (WT, pawg feem hauv qab), qhov siab tshaj plaws adsorption tus nqi ntawm C yog mus txog, uas yog 4 zaug uas tsis muaj kev tsis paub. Txawm li cas los xij, thaum lub chaw thauj khoom txuas ntxiv kom nce rau 54%, tus nqi adsorption tsawg dua. Qhov no yuav yog vim tias ntau dhau apts ntawm saum npoo ntawm CNTs nce qhov kev hloov pauv loj loj ntawm CO2 txawv rau sab hauv.
Cov ntaub ntawv tshawb fawb tau lees paub tias muaj peev xwm ntawm cov pa roj carbon nanotubes hloov kho nrog amino pawg adsorb CO2 yog qhov zoo dua li ntawm cov pa roj carbon nanotubes. Cov pa roj carbon nanotubes hloov kho nrog cov pab pawg AMino qhia tau zoo nyob hauv kev ntes CO2, tab sis lawv qhov chaw tsim nyog tau txwv vim lawv tus nqi siab.
Amino-hloov graphene
Cov qauv siv lead ua ntawm cov duab ci ci yog qhov ua tiav, uas ua rau nws cov tshuaj tsis muaj zog. Txhawm rau nthuav tawm cov ntawv thov ntau ntawm graphene thiab txhim kho nws daim ntawv thov tus nqi, nws cov nplaim yuav tsum tau hloov kho. Cov pab pawg ua haujlwm tsim tau tom qab graphene oxidation nce kev ua si ntawm graphene, nphing lub hauv paus rau kev hloov siab kev hloov pauv. Tom qab ntawd, lub npoo kev ua haujlwm ntawm graphene tuaj yeem ua tiav los ntawm kev kho nws nrog reagents xws li organic amines thiab isocyanates.
Xyoo 2012, Mishra li al. Ua ntej qhia cov npoo ntawm graphene nrog polyaniline (PANI) kom ntes graphene muaj qhov muaj peev xwm hloov kho cov roj carbon, zeeolite, hlau nanotubes. Lawv kuj tau kawm thiab piv cov adsorptation ototherms ntawm polyaniline-hloov cov ntaub ntawv thiab cov duab tsis tau unbodified. Thaum lub siab yog 11 bar thiab qhov ntsuas kub yog 25℃thiab 100℃thiab 100 deplified cov khoom pani-g, 44molol / g thiab 31 hli / g feem; Thaum lub sij hawm adsorption ntawm unmodified ntshiab graphene heg yog 21,6mmol / g, 18mmol / g thiab 12 hli / g. Txawm hais tias qhov kev tshawb fawb ntawm cov adsorption ntawm CO2 los ntawm amino-hloov graphite nyuam qhuav pib, nws tau pom cov ntawv thov zoo thiab nthuav dav qhov chaw hauv qhov no. Tej zaum qhov no yuav dhau los ua kev taw qhia tshiab rau kev txhim kho ntawm CO2 adsorption cov ntaub ntawv.
Piv txwv li amino-hloov cov khoom siv hlau-organic-organic Qhov no tau qhib ib daim teb tshiab rau kev kawm adsorbents thiab yuav zoo li los ua kev tshawb fawb yav tom ntej.
Amine-optimized Membrane Sib Cais Tshuab Rau CO2 Adsorption
Membrane sib cais yog zoo ib yam li cov txheej txheem tshuaj ntsuam. Raws li lub pore loj ntawm daim nyias nyias, muaj qee cov tshuaj tuaj yeem hla dhau ntawm daim nyias nyias thaum lwm cov tshuaj yeeb yaj kiab, yog li ua tiav lub hom phiaj sib cais. Qhov kev cuam tshuam loj tshaj plaws ntawm membrakas sib cais hauv cov roj sib cais yog tias kev xaiv yog tsis siab. Yog tias koj xav txhim kho kev xaiv ntawm membrane sib cais thiab txhim kho kev sib cais, koj tuaj yeem sib txuas ua ke nrog kev nqus lossis kos adsorption. Ua ntej, siv membrane sib cais kom nyias cais cov roj, thiab tom qab ntawd siv cov dej cawv haus cawv lossis ua kom muaj kev ua tiav zoo adsorbent rau kev sib cais zoo. Qhov no tsis tuaj yeem ua tiav qee qhov kev sib cais ua tiav, tab sis kuj tseem txuag cov nqi peev. Ua ke membrane sib cais tshuab nrog cov dej cawv uas muaj dej caw, cia cov pa roj ntws raws ib sab ntawm daim nyias nyias, thiab thaum muaj kev sib cais mus rau sab tod los ntawm daim nyias nyias, nws yog cov dej caw cawv, nws yog cov dej cawv txiv hmab dej cawv. Qhov no amine-optimized membbrane sib cais txoj kev muaj cov khoom siv yooj yim dua thiab txo qis peev ntau dua li kev haus dej cawv kom muaj kev haus dej cawv. Ib qho ntxiv, piv nrog cov kev ua yeeb yam ib txwm sib cais qauv, muaj peev xwm adsorb CO2 tau hloov kho. Piv nrog cov qauv adsorption thiab cov dej cawv amine ua haujlwm yooj yim, kev ua haujlwm tsis zoo, cov txiaj ntsig zoo dua thiab kev nqis peev dua. Txawm li cas los xij, vim kev imprise ntawm thev naus laus zis thiab qhov tseeb uas hloov cov khoom siv tseem siv nyiaj ntau, nws tsis tau siv nyiaj txiag.
Tag
The absorption of CO2 by organic amines using chemical absorption is the most common method in industrial applications, but this method requires a large investment, high energy consumption, a complex process, and high equipment corrosion. Adsorption separation of CO2 is an economical and environmentally friendly method, but the development of efficient adsorbents is the core. Membrane separation technology has a simple process, large operational flexibility, and low investment cost, but the service life of the membrane is short. If you want to efficiently separate CO2, you must combine it with solvent absorption or adsorption. Looking at these methods, they all have their advantages and limitations, and each material also has its applicable fields and defects. The use of "1+1>2 "Cov txheej txheem tshiab lossis cov hau kev tshiab uas ua kom zoo ntawm cov ntaub ntawv tshwj xeeb, thiab cov pab pawg tau zoo tuaj yeem ua tau zoo rau CO2 thiab muaj cov kev tshawb fawb zoo.
