Txoj kev acetylene rau kev npaj maleic anhydride los ntawm 1,4-butanediol yog dab tsi?

Txoj kev Acetylene rau 1,4-butanediol kev npaj ntawm maleic anhydride.

Ua ntej, acetylene reacts nrog formaldehyde nyob rau hauv lub xub ntiag ntawm Cu-Bi catalyst ntawm 98kPa thiab 80-95 ° C los tsim 1,4-butynediol. Tom qab ntawd, 1,4-butynediol yog hydrogenated rau hauv 1,4-butenediol nyob rau hauv lub catalysis ntawm skeletal nickel ntawm 1.372-2.06MPa thiab 50-60 ° C. Tom ntej no, ntxiv catalytic hydrogenation (13.7-20.6MPa, 120-140 ° C) yog nqa tawm nrog Ni-Cu-Mn / Al₂O₃ los tsim 1,4-butanediol. Tom qab tshem tawm cov hlau ions ntawm ion pauv resin, ntshiab 1,4-butanediol yog tau los ntawm distillation thiab purification.

Vim li cas ho xaiv Maleic Anhydride? Nws yog lub hauv paus ntawm cov polyester resins tsis muaj zog zoo tshaj plaws, ntxiv rau nws qhib ntau yam tshuaj lom neeg (BDO, THF, thiab lwm yam). Xa xov rau peb tam sim no kom tshawb nrhiav cov kev daws teeb meem MA uas haum rau koj txoj kev lag luam!