Cov khoom
Tshwj xeeb hauv kev tsim cov cawv propargyl, 1,4 butynediol thiab 3-chloropropyne
1,4-butanediol (BDO) thiab nws cov kev npaj ntawm biodegradable yas PBAT
Taw qhia
1, 4-butanediol (BDO);PBAT yog thermoplastic biodegradable yas, uas yog copolymer ntawm butanediol adipate thiab butanediol terephthalate.Nws muaj cov yam ntxwv ntawm PBA (polyadipate-1, 4-butanediol ester diol) thiab PBT (polybutanediol terephthalate).Nws muaj qhov zoo ductility thiab elongation ntawm kev tawg, nrog rau kev ua kom sov thiab ua haujlwm zoo.Tsis tas li ntawd, nws muaj biodegradability zoo heev thiab yog ib qho ntawm cov khoom siv biodegradable nrov tshaj plaws hauv kev tshawb fawb ntawm biodegradable plastics thiab daim ntawv thov zoo tshaj plaws hauv kev ua lag luam.
Cov hauv qab no yog cov muaj pes tsawg leeg ntawm PBAT polymer saw ntu:
Kev tsim khoom lag luam ntawm 1, 4-butanediol tau pom zoo hauv plaub txheej txheem tseem ceeb.
1. Aldehyde method (Reppe method): thawj acetylene thiab formaldehyde nyob rau hauv lub xub ntiag ntawm Cu-BI catalyst los ua 1, 4-butynediol.Cov tom kawg yog ntxiv hydrogenated rau 1, 4-butenediol ntawm pob txha npib tsib xee, ua raws li Ni-Cu-Mn / Al2O3 rau 1, 4-butanediol.
2. Maleic anhydride hydrogenation: nws yog ntxiv muab faib ua maleic anhydride esterification hydrogenation thiab maleic anhydride direct hydrogenation.
3. Butadiene txoj kev: los ntawm 1, 3-butadiene thiab acetic acid thiab oxygen acetyl oxidation cov tshuaj tiv thaiv, los tsim 1, 4-diacetyloxy-2-butadiene, thiab tom qab ntawd hydrogenation, hydrolysis.
4. propylene oxide txoj kev (allyl cawv txoj kev): propylene oxide raws li raw khoom, catalytic isomerization rau allyl cawv, nyob rau hauv organic phosphine ligand catalyst nyob rau hauv qhov kev txiav txim ntawm hydroformylation cov tshuaj tiv thaiv los tsim cov khoom tseem ceeb γ-hydroxypropanal, thiab ces extraction, hydrogenation, refining. kom tau BDO.
Reppe txoj kev yog cov txheej txheem ib txwm ua los tsim BDO, uas yog raws li acetylene thiab formaldehyde raws li cov khoom siv raw, kev sib xyaw thiab hydrogenation ntawm ob kauj ruam los tsim BDO: ① acetylene thiab formaldehyde cov tshuaj tiv thaiv los tsim 1, 4-butynediol thiab propargyl cawv raws li cov khoom lag luam. ;②1, 4-butanediol yog hydrogenated rau daim ntawv 1, 4-butanediol.
Kev npaj acetylene muaj [natural gas/roil route] thiab [coal route] : kev siv coke thiab limestone nyob rau hauv qhov cub kub kub los tsim cov calcium carbide, calcium carbide thiab dej tshuaj tiv thaiv los tsim acetylene;Acetylene yog tsim los ntawm cov roj los yog roj los ntawm ib nrab oxidation ntawm methane.
