Izakhiwo ze-MDEA Physicochemical kanyeumgomo we-decarburizationngegesi yemvelo
I-MDEA, igama lesayensi i-N -methyldiethanolamine, iwuketshezi lwe-viscous olungenambala noma oluphuzi kancane.
Ifomula yemolekyuli: CH3N(CH2CH2OH)2 ,
Iphuzu elibilayo: 246 ~ 249 ℃ /760mmhg; amandla adonsela phansi athile: 1.0425g/ml (20 ℃);
Iphuzu lokuqandisa: -21 ℃ (ubumsulwa 99%); i-viscosity: 101Cp (20 ℃);
Ingahlanganiswa kalula namanzi, i-ethanol, i-ether, njll.; i-alkaline ebuthakathaka emanzini; ukusabela kwamakhemikhali kuzokwenzeka ku-asidi i-carbon dioxide kanye negesi ye-hydrogen sulfide, futhi ekucindezelweni okuphezulu, i-carbon dioxide ne-hydrogen sulfide gas iba phezulu Ngakho yonke inqubo yokumuncwa yinqubo yokumuncwa ngokomzimba namakhemikhali.
Uketshezi olucebile lwe-MDEA ngemva kokumunca i-hydrogen sulfide ne-carbon dioxide lungena ku-flash tank ukuze kuhwamuke i-flash ye-vacuum, bese luthunyelwa embhoshongweni wokuvuselela. Uketshezi olucebile luyashiswa futhi lubole phansi kombhoshongo ukuze lukhulule ngokuphelele i-carbon dioxide ne-hydrogen sulfide. Ngesikhathi esifanayo, igesi engaphansi kombhoshongo iyakhuphuka ukuze yakhe umphumela wokuhlubula wesibili oketshezini olucebile phezulu kombhoshongo.; ngakho yonke inqubo yokuvuselela futhi iyinqubo yokuvuselela ngokomzimba namakhemikhali. I-chemical reaction ethize imi kanje:
I-R2R'N + H2S R2R'NH +HS (ukusabela okusheshayo)
R2R'N+CO2+ H2O R2R'NH +HCO3 (ukusabela kancane)
Ukumuncwa kanye nokuvuselelwaumgomo we-decarburizationngegesi yemvelo
Ngemva kokuba igesi yokuphakelayo ingene emkhawulweni webhethri, ukungcola namaconsi egesi akhishwa isihlukanisi sokuhlunga, futhi ingena embhoshongweni wokumuncwa kusukela phansi. Embhoshongweni, iphinde ihlangane nesixazululo se-MDEA esifuthwe kusuka phezulu. Isixazululo se-aqueous se-MDEA (i-amine lean solution) simunca i-hydrogen sulfide ne-carbon dioxide kugesi yemvelo, ukuze i-hydrogen sulfide ne-carbon dioxide kugesi yokuphakelayo kukhishwe ukuze kuhlangatshezwane nezidingo zobuchwepheshe zomnikazi. Igesi ehlanzekile ithunyelwa ngaphandle komngcele ngesihlukanisi segesi yomkhiqizo ngemva kokushiya phezulu kombhoshongo wokumuncwa.
Ngaphansi kokulawulwa kwe-valve elawula izinga loketshezi, ileveli yoketshezi engezansi kombhoshongo wokumuncwa idlulisela i-amine ecebile ethangini le-flash. I-amine ecebile esuka ngaphansi kombhoshongo wokumunca ingena ethangini le-flash. Iningi lama-hydrocarbon amuncwe ku-amine ecebile ancibilika esigabeni segesi ekhanyayo. Ngaphansi kokulawulwa kwe-valve elawula ukucindezela, isitimu esikhanyayo sibuyiselwa ohlelweni lwegesi yamafutha. Uketshezi lwe-amine olucebile luthunyelwa kusishintshi sokushisa esithambile/esicebile se-amine. I-amine eshisayo ethambile evela embhoshongweni wokuvuselela ishisa i-amine ecebile evela ku-flash tank, bese i-amine ecebile ingena embhoshongweni wokuvuselela i-amine.
Isitimu esikhiqizwe i-reboiler ngaphansi kombhoshongo wokuvuselela i-amine sithintana nesisombululo se-amine esicebile, sikhipha igesi ye-asidi kuso, ngaleyo ndlela siqedele ukuvuselelwa kwe-amine ecebile. Ngaphansi kokulawulwa kwevalvu elawula izinga loketshezi ngaphansi kombhoshongo wokuvuselela i-amine, isisombululo se-amine esishisayo siphuphuma siye emshinini wokushisa we-amine onciphile/ocebile. Iphampu ye-amine booster ethambile icindezela i-amine ethangini le-amine buffer ngo-1.0mpa futhi iyithumele embhoshongweni wokumunca. Ivalvu elawula ukugeleza ifakwe epayipini le-amine elithambile eliya embhoshongweni wokumuncwa, lapho i-amine ethambile igeleza ingena embhoshongweni wokumuncwa kulawulwa.
