Izakhiwo ze-MDEA ze-Physicochemical kanye isimiso sokususa i-carburizationngegesi yemvelo
I-MDEA, igama lesayensi elithi N-methyldiethanolamine, iwuketshezi oluqinile olungenambala noma oluphuzi kancane.
Ifomula yama-molecule: CH3N(CH2CH2OH)2,
Iphuzu lokubila: 246~249 ℃ /760mmhg; amandla adonsela phansi athile: 1.0425g/ml (20 ℃);
Iphuzu lokuqandisa: -21 ℃ (ubumsulwa 99%); i-viscosity: 101Cp (20 ℃);
Ingaxutshwa kalula namanzi, i-ethanol, i-ether, njll.; i-alkaline encane emanzini; ukusabela kwamakhemikhali kuzokwenzeka ku-acid carbon dioxide kanye negesi ye-hydrogen sulfide, futhi uma ingcindezi iphezulu, igesi ye-carbon dioxide kanye ne-hydrogen sulfide iba phezulu Ngakho-ke yonke inqubo yokumunca iyinqubo yokumunca ngokomzimba namakhemikhali.
Uketshezi olucebile lwe-MDEA ngemuva kokumunca i-hydrogen sulfide kanye ne-carbon dioxide lungena ethangini le-flash ukuze luphume nge-vacuum flash, bese luthunyelwa embhoshongweni wokuvuselela. Uketshezi olucebile luyashiswa futhi luboliswe phansi kombhoshongo ukuze lukhiphe ngokuphelele i-carbon dioxide kanye ne-hydrogen sulfide. Ngesikhathi esifanayo, igesi ephansi kombhoshongo iyakhuphuka ukuze yakhe umphumela wesibili wokuhlubula kuketshezi olucebile phezulu kombhoshongo. ngakho-ke yonke inqubo yokuvuselela nayo iyinqubo yokuvuselela ngokomzimba namakhemikhali. Ukusabela kwamakhemikhali athile kungokulandelayo:
R2R'N + H2S R2R'NH +HS (ukusabela okusheshayo)
R2R'N+CO2+ H2O R2R'NH +HCO3 (ukusabela okuhamba kancane)
Ukumuncwa nokuvuselelwaisimiso sokususa i-carburizationngegesi yemvelo
Ngemva kokuba igesi yokuphakelayo ingene emkhawulweni webhethri, ukungcola namaconsi kugesi kususwa yisihlukanisi sesihlungi, bese singena embhoshongweni wokumunca kusuka phansi. Embhoshongweni, sithintana nomshini ophikisanayo nesixazululo se-MDEA esifuthwe kusuka phezulu. Isixazululo samanzi se-MDEA (isixazululo se-amine lean) simunca i-hydrogen sulfide kanye ne-carbon dioxide kugesi yemvelo, ukuze i-hydrogen sulfide kanye ne-carbon dioxide kugesi yokuphakelayo kususwe ukuze kuhlangatshezwane nezidingo zobuchwepheshe zomnikazi. Igesi ehlanziwe ithunyelwa ngaphandle komngcele ngokusebenzisa isihlukanisi segesi yomkhiqizo ngemuva kokushiya phezulu kombhoshongo wokumunca.
Ngaphansi kokulawulwa kwevalvu yokulawula izinga loketshezi, izinga loketshezi phansi kombhoshongo wokumunca lidlulisela i-amine ecebile ethangini le-flash. I-amine ecebile evela phansi kombhoshongo wokumunca ingena ethangini le-flash. Iningi lama-hydrocarbon angena kwi-amine ecebile akhishwa esigabeni segesi ye-flash. Ngaphansi kokulawulwa kwevalvu yokulawula ingcindezi, umusi we-flash ubuyiselwa ohlelweni lwegesi kaphethiloli. Uketshezi lwe-amine ecebile luthunyelwa ku-lean/rich amine heat exchanger. I-amine eshisayo ethambile evela kumbhoshongo wokuvuselela ifudumeza i-amine ecebile evela ethangini le-flash, bese i-amine ecebile ingena embhoshongweni wokuvuselela i-amine.
Umusi okhiqizwa yi-reboiler phansi kombhoshongo wokuvuselela i-amine uthintana nesisombululo se-amine esicebile esiphikisanayo, ususa igesi ye-asidi kuyo, ngaleyo ndlela kuqedwe ukuvuselelwa kwe-amine ecebile. Ngaphansi kokulawulwa kwevalvu yokulawula izinga loketshezi phansi kombhoshongo wokuvuselela i-amine, isisombululo se-amine esishisayo sigcwala siye ku-lean/rich amine heat exchanger. Iphampu ye-lean amine booster icindezela i-amine ethangini le-amine buffer nge-1.0mpa bese iyithumela embhoshongweni wokungenisa. Ivalvu yokulawula ukugeleza ifakwa kumbhobho we-lean amine oya embhoshongweni wokungenisa, lapho ukugeleza kwe-lean amine kuya embhoshongweni wokungenisa kulawulwa khona.
