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I-I-Monoethanolamine (MEA), eyaziwa ngokuba yi-ethanolamine okanye i-2-aminoethanol, i-CAS No. Kubonakala kumashishini amaninzi abonakala ahluke kakhulu omnye komnye - amacandelo onyango lwegesi yendalo kuMbindi Mpuma, iilebhu zezithambiso eYurophu, kunye nezityalo zesamente eMzantsi-mpuma Asia. Oku akuyonto nje yamabona-ndenzile. Ivela kwisakhiwo se-molecular ye-MEA: iqulethe zombini iqela le-amine kunye neqela le-hydroxyl, elivumela ukuba lenze imisebenzi elula i-amines okanye i-alcohols ayikwazi ukubonelela ngokulula ngexesha elifanayo.
Kubathengi bemizi-mveliso, oku kukwathetha ukuba i-MEA ayifane ithengelwe ukusetyenziswa enye kuphela. Imveliso efanayo ingasetyenziselwa unyango lwegesi yendalo, ukulungiswa kwe-pH, ukuxutywa kokucoca, izixhobo zokugaya isamente okanye iikhemikhali zezolimo. Nangona kunjalo, izicelo ezahlukeneyo zinokuba neemfuno ezahlukeneyo zokucoceka, ukupakishwa, ukugcinwa, ukuphatha kunye nokuzinza kokubonelela. Kweli nqaku, i-Dotachem ijonga iindawo ezichanekileyo zesicelo se-MEA, kutheni iqhubeka isetyenziswa kula mashishini, kwaye yintoni abathengi abafanele banikele ingqalelo kuyo xa befuna i-monoethanolamine evela e-China.
Unyango lweGesi: Indawo yeSicelo esikhulu se-MEA
Ukuba usebenza kunyango lwegesi yendalo, i-MEA inokuba yinto eqhelekileyo. Ukususela ngo-1930, i-MEA isetyenziselwe ukususa i-CO2 kunye ne-H2S kwimijelo yegesi, kwaye ihlala iyinto eqhelekileyo kwiiyunithi ezininzi namhlanje. Oku akubangelwa kukuba zingekho ezinye iindlela, kodwa ngenxa yokuba kuxinzelelo oluphakathi kunye nosetyenziso oluthe ngqo lwerhasi, i-MEA ibonelela ngezibonelelo zeendleko eziphantsi kunye nokusebenza okulula.
Kwiyunithi yonyango yegesi yendalo eqhelekileyo, i-MEA idla ngokusetyenziswa kwi-concentration ye-15-30% ngesisindo. Ithatha iigesi ze-asidi kumaqondo aphantsi kwaye iwakhulule ngexesha lokuhlaziywa kwamaqondo aphezulu, okuvumela ukuba i-solvent isetyenziswe kumjikelezo oqhubekayo. Ukukhawulelana kwayo kukuba, phantsi koxinzelelo oluphezulu lwe-CO2, i-MEA iyancipha ngokulula kunee-amine ezintsha ezifana ne-MDEA kwaye ifuna amandla amaninzi okuvuselela. Nangona kunjalo, kwiiyunithi ezincinci okanye iiprojekthi apho iindleko zenkunzi zibaluleke ngaphezu kokusetyenziswa kwe-solvent yexesha elide, i-MEA isenexabiso lezoqoqosho.
Kubathengi kwishishini lonyango lwegesi, ixabiso liyinxalenye yesigqibo kuphela. Ukucoceka okuzinzile, umxholo wamanzi aphantsi, ukupakishwa kobuninzi obufanelekileyo kunye neeshedyuli ezithembekileyo zokuhanjiswa nazo zibalulekile, kuba ukusebenza kwe-solvent kunokuchaphazela ngokuthe ngqo ukusebenza kwezityalo.
Ukhathalelo loBuqu: Ngaphezulu koMlungelelanisi we-pH
I-MEA idla ngokufumaneka kwiifom zokhathalelo lomntu, ngokuqhelekileyo kwinqanaba lokusetyenziswa kwe-0.1-2%. Isenokubonakala isetyenziselwa ukuthomalalisa izithako ezineasidi ezinjengee-carbomers kunye nokunceda ukuzinzisa i-emulsions. Nangona kunjalo, abaqulunqi bahlala bekhetha i-MEA endaweni yezinye izinto ezingathathi hlangothi ngenxa yokuba iityuwa ezenziwe yi-MEA zinokubonelela ngokuziva ngcono kwesikhumba kwaye zithintele ubungqwabalala obunamandla obunokuziswa yi-sodium hydroxide.
I-MEA inokuphinda isetyenziswe kwizinto eziluhlaza ezifana ne-MEA-lauryl sulfate, i-surfactant esetyenziswa kwiishampu kunye nezicoci zobuso apho kufuneka ubulali. Inqaku elinye labaqulunqi kufuneka bajongwe kukuba i-MEA inokubangela ukuguquka kombala kwiindawo eziphezulu okanye phantsi kweemeko ezishushu, ngoko ke ubushushu bokusebenza kunye nedosi yokugqibela kufuneka ilawulwe.
Kukhathalelo lobuqu kunye nabavelisi bemichiza bemihla ngemihla, ukufumana i-MEA ayikokuthenga nje imathiriyeli ekrwada ye-amine. Abathengi badla ngokufuna iinkcukacha ezicacileyo, umgangatho webhetshi ohambelanayo kunye namaxwebhu anokuxhasa uvavanyo lokuqulunqa kunye nokuphononongwa komgangatho. Oku kwakhona yiloo nto i-Dotachem igxininise kuyo xa inikezela i-MEA kunye nezinye iikhemikhali ze-amine kubathengi ekunyamekeleni komntu, i-detergent kunye ne-surfactant-related-industries - ukubeka ulawulo lomgangatho kuqala.
Ukucoca kwimizi-mveliso: Ukulawulwa kweAlkalinity ngoxinzelelo oluncinci olusuka kwiAlkalis Eyomeleleyo
Izicoci ezinomthwalo onzima, ezifana nezicoci ze-oven, ii-degreaser ze-hard surface kunye nezicoci zomgangatho woshishino, ngokuqhelekileyo zifuna i-pH ephezulu ukususa igrisi kunye neentsalela ezibhakiweyo. I-sodium hydroxide inokufezekisa oku, kodwa inobudlova, inokonakalisa iindawo kwaye akusoloko kulula ukuyiqulunqa kwiinkqubo ezizinzileyo zolwelo.
I-MEA ibonelela nge-alkalinity eyomeleleyo kwifom elawulekayo ngakumbi. Ayinabunewunewu obuncinci, kulula ukuyixuba nezinye izithako, kwaye ingasebenza njenge-arhente yokudibanisa ukunceda ukugcina imixube esekwe emanzini izinzile. Ukucoca abavelisi beemveliso abafuna amandla okucoca ngelixa benciphisa uxinzelelo lokusingatha i-alkalis eqinile, i-MEA yindlela esebenzayo ephakathi.
Ukupakishwa kwakhona kubalulekile, kuba abavelisi beemveliso zokucoca ezinobungakanani obahlukeneyo banokufuna ukupakishwa kwegubhu, iitanki ze-IBC okanye unikezelo lolwelo oluninzi. I-Dotachem inokubonelela ngokupakishwa kwe-MEA eguquguqukayo kunye namalungiselelo okuhambisa kuzo zombini iiodolo zesilingo kunye nokuthengwa kwexesha elide kwimizi-mveliso.
I-Cement Grinding Aid: I-Dosage encinci, uPhuculo loPhuculo oluMelekayo
Kubantu abangaphandle koshishino lweekhemikhali zokwakha, olu setyenziso lusenokungaziwa kangako. I-MEA ingasetyenziswa kwiindawo zokusila zesamente ngedosi ephantsi njenge-0.02–0.05% ngobunzima besamente. Nangona i-dosage incinci, umphumo wayo ekusebenzeni kakuhle kokugaya inokulinganiswa. Ngexesha lokugaya, i-MEA inokubhengeza kumphezulu weengqungquthela zesamente, ukunciphisa i-particle agglomeration kunye nokuphucula ukusabalalisa ubungakanani be-particle. Isiphumo esisebenzisekayo sisiphumo esiphakamileyo sokusila kunye nokusebenza ngcono kwamandla kwangethuba kwikhonkrithi yokugqibela.
Kweli nqanaba ledosi, ixabiso ngetoni nganye yesamente liphantsi, yiyo loo nto abavelisi besamente kwiimarike ezingakhathaliyo besebenzisa olu hlobo lwemathiriyeli ekrwada iminyaka emininzi.
Uqulunqo lwezoLimo: Ukunceda izithako ezisebenzayo zisebenze ngcono
Kuqulunqo lweyeza lokutshabalalisa ukhula kunye nezitshabalalisi, i-MEA ingasetyenziselwa ukuguqula izithako ezisebenzayo ezineasidi zibe ziifom zetyuwa yeamine. Ezi fomu zihlala zinonyibiliko olungcono lwamanzi, uzinzo olukhulu kwizigxina zolwelo kunye nosetyenziso olulula. Iityuwa ze-MEA-based herbicide zikholisa ukubonakala kwiimveliso zokutshatyalaliswa kokhula ezibanzi.
Ukongeza ekubunjweni kwetyuwa, i-MEA inokunceda ekuphuculeni ukusasazeka kunye nokunamathela kwezithako ezisebenzayo kwiindawo zezityalo, ezivumela ukuba zihlale zingcono kwindawo yesicelo endaweni yokuba zibaleke ngokukhawuleza. Oku kunexabiso elibonakalayo kwiimarike apho ukunciphisa ukusetyenziswa kwe-agrochemical okanye ukulawula iindleko kubalulekile.
Kubathengi bokwenziwa kwezolimo, ukhetho lwe-MEA luqhele ukunxulumana nokunyibilika, ubunyulu, ukuhambelana kunye nokubonelela ngebhetshi okuzinzileyo. I-Dotachem inokusebenzela abathengi abasebenzisa i-MEA kwi-agrochemical intermediates, ukuxutywa kwe-herbicide kunye nezinye iinkqubo zemichiza yemizi-mveliso apho umgangatho wezinto eziluhlaza uyafuneka.
Yintoni ekufuneka abathengi bayiqwalasele ngokwenene xa bethenga i-MEA?
Kubathengi abaninzi bemizi-mveliso, i-MEA sisimbuku semathiriyeli ekrwada. Ukucoceka kunye nokubonelela ngokuzinzileyo yimfuneko esisiseko, kungekhona iindawo zokuthengisa ezongezelelweyo. Ekuthengeni okwenyani, iingxaki ezibangela inkathazo zihlala zizisulu zokungahambelani phakathi kweebhetshi, ukupakishwa okungahambelani nokuseta umthengi wokuphatha, okanye umthengisi ongakwaziyo ukuphendula ngokukhawuleza xa imfuno inyuka.
Ngaphambi kokuthenga i-monoethanolamine, abathengi bahlala befuna ukuqinisekisa la manqaku alandelayo:
Kwiimveliso ezinxulumeneyo kuluhlu lweekhemikhali ze-amine, bonaDiethanolamine(I-DEA),I-I-Triisopropanolamine(TIPA),Ethylenediamine(EDA),Triethylenediamine(TEDA) kunye ngokupheleleyoImveliso yeeminesudidi. Zive ukhululekile ukubaQhagamshelana nathingolwazi oluninzi lwemveliso kunye nenkxaso yocaphulo.
Kubathengi abathelekisa i-MEA kunye ne-DEA kuqulunqo lwemizi-mveliso, unokufunda kwakhona isikhokelo sethu sesicelo se-ethanolamine.
Izicelo ze-Ethanolamine: Indlela i-MEA kunye ne-DEA ezixhasa ngayo iiFomu zoShishino
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