Imikhiqizo
Isebenza ngokukhethekile ekukhiqizeni utshwala be-propargyl, i-1,4 butynediol kanye ne-3-chloropropyne
1,4-butanediol (BDO) kanye nokulungiswa kwayo kwePBAT yepulasitiki ebolayo
Isingeniso
1, 4-butanediol (BDO);I-PBAT iyipulasitiki ekwazi ukubola nge-thermoplastic, eyi-copolymer ye-butanediol adipate ne-butanediol terephthalate.Inezici ze-PBA (i-polyadipate-1, i-4-butanediol ester diol) ne-PBT (i-polybutanediol terephthalate).Ine-ductility enhle kanye nobude ngesikhathi sekhefu, kanye nokumelana nokushisa okuhle nokusebenza komthelela.Ngaphezu kwalokho, inokubola okuhle kakhulu kwe-biodegradability futhi ingenye yezinto ezidume kakhulu ezibolayo ocwaningweni lwamapulasitiki abolayo kanye nokusetshenziswa okuhle kakhulu emakethe.
Okulandelayo ukwakheka kwezingxenye ze-PBAT polymer chain:
Ukukhiqizwa kwezimboni kwe-1, 4-butanediol kuye kwatholakala ngezinqubo ezine eziyinhloko.
1. Indlela ye-Aldehyde (indlela ye-Reppe) : i-acetylene yokuqala ne-formaldehyde phambi kwe-Cu-BI catalyst yokwenza i-1, i-4-butynediol.Lokhu kokugcina kuphinde kufakwe i-hydrogenated ku-1, 4-butenediol nge-skeleton nickel, kulandele i-Ni-Cu-Mn/Al2O3 kuya ku-1, 4-butanediol.
2. I-anhydride ye-maleic hydrogenation: iphinde ihlukaniswe yaba i-maleic anhydride esterification hydrogenation kanye ne-maleic anhydride eqondile ye-hydrogenation.
3. Indlela ye-Butadiene: kusuka ku-1, i-3-butadiene ne-acetic acid ne-oxygen acetyl oxidation reaction, ukukhiqiza i-1, i-4-diacetyloxy-2-butadiene, bese i-hydrogenation, i-hydrolysis.
4. Indlela ye-propylene oxide (indlela yotshwala ye-allyl): i-propylene oxide njengempahla eluhlaza, i-catalytic isomerization ibe i-alyl alcohol, ku-organic phosphine ligand catalyst ngaphansi kwesenzo sokusabela kwe-hydroformylation ukukhiqiza umkhiqizo oyinhloko i-γ-hydroxypropanal, bese ukukhishwa, i-hydrogenation, ukucwengisiswa. ukuze uthole i-BDO.
Indlela ye-Reppe iyindlela evamile yokukhiqiza i-BDO, esekelwe ku-acetylene ne-formaldehyde njengezisetshenziswa zokusetshenziswa, ukuhlanganiswa kanye ne-hydrogenation yezinyathelo ezimbili zokukhiqiza i-BDO: ① ukusabela kwe-acetylene kanye ne-formaldehyde ukukhiqiza i-1, 4-butynediol kanye notshwala be-propargyl njenge-byproduct ;②1, 4-butanediol i-hydrogenated ukuze yakhe i-1, 4-butanediol.
Ukulungiswa kwe-acetylene kune-[umzila wegesi yemvelo/uwoyela] kanye [nomzila wamalahle] : ukusetshenziswa kwe-coke ne-limestone esithandweni sokushisa okuphezulu ukuze kukhiqizwe i-calcium carbide, i-calcium carbide nokusabela kwamanzi ukuze kukhiqizwe i-acetylene;I-acetylene ikhiqizwa ngegesi yemvelo noma uwoyela nge-oxidation ingxenye ye-methane.
