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MDEA Physicochemical properties ndidecarburization mfundokwa gasi wachilengedwe

MDEA, dzina la sayansi N -methyldiethanolamine, ndi madzi opanda mtundu kapena achikasu pang'ono.

Mapangidwe a maselo: CH3N(CH2CH2OH)2 ,

Malo otentha: 246 ~ 249 ℃ / 760mmhg; mphamvu yokoka yeniyeni: 1.0425g/ml (20 ℃);

Kuzizira mfundo: -21 ℃ (chiyero 99%); kukhuthala: 101Cp (20 ℃);

Ikhoza kusakanikirana mosavuta ndi madzi, ethanol, ether, etc.; ofooka zamchere m'madzi; Chemical reaction idzachitika mu acid carbon dioxide ndi mpweya wa hydrogen sulfide, ndipo pamphamvu kwambiri, mpweya woipa wa carbon dioxide ndi hydrogen sulfide umakhala wokwezeka.

Madzi olemera a MDEA atatha kuyamwa hydrogen sulfide ndi carbon dioxide amalowa mu thanki yamoto kuti awonongeke, kenako amatumizidwa ku nsanja yokonzanso. Madzi olemera amatenthedwa ndikuwola pansi pa nsanja kuti atulutse mpweya woipa ndi hydrogen sulfide. Panthawi imodzimodziyo, mpweya womwe uli pansi pa nsanja umakwera kuti upangitse kuvula kwachiwiri pamadzi olemera pamwamba pa nsanja; kotero njira yonse yobadwanso mwatsopano imakhalanso yakuthupi ndi mankhwala. Ma Chemical reaction ali motere:

R2R'N + H2S R2R'NH +HS (instant reaction)

R2R'N+CO2+ H2O R2R'NH +HCO3 (kuchita pang'onopang'ono)

Kuyamwa ndi kusinthikadecarburization mfundokwa gasi wachilengedwe

Pambuyo pa mpweya wodyetsa umalowa mu malire a batri, zonyansa ndi madontho a gasi amachotsedwa ndi cholekanitsa fyuluta, ndipo amalowa munsanja yoyamwitsa kuchokera pansi. Mu nsanjayo, imalumikizidwa ndi njira ya MDEA yopopera kuchokera pamwamba. MDEA aqueous solution (amine lean solution) imatenga hydrogen sulfide ndi carbon dioxide mu gasi wachilengedwe, kotero kuti hydrogen sulfide ndi carbon dioxide mu gasi wodyetsa amachotsedwa kuti akwaniritse zofunikira za mwiniwake. Mpweya woyeretsedwa umatumizidwa kunja kwa malire kudzera pa cholekanitsa mpweya wa mankhwala pambuyo pochoka pamwamba pa nsanja yoyamwitsa.

Poyang'aniridwa ndi valavu yoyendetsera mlingo wamadzimadzi, mlingo wamadzimadzi pansi pa nsanja yoyamwitsa umatulutsa amine wolemera ku thanki yamoto. Amine wolemera kuchokera pansi pa nsanja yoyamwitsa amalowa mu thanki ya flash. Ma hydrocarbons ambiri omwe amalowetsedwa mu amine wolemera amawotchedwa mpaka gawo la gasi. Poyang'aniridwa ndi valve yoyendetsera kuthamanga, nthunzi yamoto imabwezeretsedwa ku dongosolo la gasi lamafuta. Madzi olemera a amine amatumizidwa ku chotenthetsera chowonda/cholemera cha amine. Amine yotentha yowonda kuchokera ku nsanja yosinthika imatenthetsa amine wolemera kuchokera mu thanki yamoto, ndiyeno amine wolemera amalowa munsanja yokonzanso amine.

Nthunzi yopangidwa ndi reboiler pansi pa nsanja yotsitsimutsa amine imalumikizana ndi amine solution countercurrent, ndikuchotsa mpweya wa asidi kuchokera pamenepo, motero kumaliza kusinthika kwa amine wolemera. Poyang'aniridwa ndi valavu yoyendetsera madzi pansi pa nsanja yotsitsimutsa amine, njira yotentha ya amine imasefukira ku chowotcha / cholemera cha amine kutentha. Pampu yowongoka ya amine imakakamiza amine mu tanki ya amine ndi 1.0mpa ndikuitumiza kunsanja yomangira. Valavu yoyendetsera kayendedwe imayikidwa papaipi yowonda ya amine kupita ku nsanja yoyamwitsa, pomwe mayamwidwe a amine amalowa munsanja yoyamwitsa amawongoleredwa.