ʻO ke kumu hopena o ka cellulose ether hydroxypropyl methyl cellulose: ka hana ʻana o ka HPMC hydroxypropyl methyl cellulose e hoʻohana i ka methyl chloride a me ka propylene oxide ma ke ʻano he etherification agents. ʻO ka hoʻohālikelike hopena kemika: Rcell-OH (ka pulupulu hoʻomaʻemaʻe) + NaOH (sodium hydroxide) , Sodium hydroxide) + CspanCl (methyl chloride) + CH2OCHCspan (propylene oxide) → Rcell-O -CH2OHCHCspan (hydroxypropyl methylcellulose) + NaCl (sodium chloride) ) + H2O (wai)
Kaʻina hana:
ʻO ka pulupulu hoʻomaʻemaʻe - alkaliization - hānai - alkalization - etherification - hoʻihoʻi hou a me ka holoi ʻana - ka hoʻokaʻawale centrifugal - hoʻomaloʻo - ka ʻohi ʻana - ka hui ʻana - ka pahu huahana
1: ʻO nā mea waiwai a me nā mea kōkua no ka hanaʻana i ka hydroxypropyl methylcellulose ʻO ka mea waiwai nui he pulupulu hoʻomaʻemaʻe, aʻo nā mea kōkua he sodium hydroxide (sodium hydroxide), propylene oxide, methyl chloride, acetic acid, toluene, isopropanol, a me ka nitrogen. ʻO ke kumu o ka hoʻoheheʻe ʻana i ka pulupulu hoʻomaʻemaʻe ʻo ia ka luku ʻana i ke ʻano o ka pulupulu hoʻomaʻemaʻe ʻia ma o ka ikehu mechanical e hōʻemi i ka crystallinity a me ka polymerization degree a hoʻonui i kona ʻili.
2: Ke ana a me ka mana o ka waiwai maka: Ma lalo o ka manaʻo o kekahi mau mea hana, ʻo ka maikaʻi o nā mea waiwai nui a kōkua a me ka lakio o ka nui i hoʻohui ʻia a me ka neʻe ʻana o ka solvent e pili pono i nā ʻano hōʻailona o ka huahana. Aia i loko o ka ʻōnaehana kaʻina hana ka nui o ka wai, a ʻaʻole hiki ke hoʻoheheʻe ʻia ka wai a me nā mea hoʻoheheʻe organik, a ʻo ka hoʻopuehu ʻana o ka wai e pili ana i ka hāʻawi ʻana o ka alkali i ka ʻōnaehana. Inā ʻaʻole lawa ka hoʻoulu ʻia ʻana, e lilo ia i mea pōʻino i ka alkalization like ʻole a me ka etherification o cellulose.
3: Ka hoʻoulu ʻana a me ka hoʻoili ʻana a me ka hoʻoili wela: Hoʻokō ʻia ka cellulose alkalization a me ka etherification ma lalo o nā kūlana heterogeneous (hoʻoulu ʻia e ka ikaika o waho). ʻO ka hoʻopuehu ʻana a me ka launa pū ʻana o ka wai, ka alkali, ka pulupulu i hoʻomaʻemaʻe ʻia a me ka etherifying agent i loko o ka ʻōnaehana solvent i lawa pono, e hoʻopili pololei i ka hopena alkaliization a me ka etherification. ʻO ka hoʻoulu ʻole ʻana i ka wā o ke kaʻina alkalization e hoʻoulu ai i nā kristal alkali a me ka ua ma lalo o ka mea hana. He haʻahaʻa ka ʻike o ka papa luna a ʻaʻole lawa ka alkaliization. ʻO ka hopena, aia ka nui o ka alkali manuahi i ka ʻōnaehana ma hope o ka pau ʻana o ka etherification. ʻO ka lokahi, ka hopena i ka ʻike pono ʻole, ʻoi aku ka nui o nā fibers manuahi, ka paʻa ʻana o ka wai maikaʻi ʻole, ke kiko gel haʻahaʻa, a me ka waiwai PH kiʻekiʻe.
4: Kaʻina hana (ka hana hana slurry)
(1:) E hoʻohui i ka nui o ka alkali paʻa (790Kg) a me ka wai (ka wai ʻōnaehana holoʻokoʻa 460Kg) i loko o ka ipu wai wai, hoʻoulu a wela i kahi mahana mau o 80 degere no ka ʻoi aku ma mua o 40 mau minuke, a pau loa ka alkali paʻa. hoʻoheheʻe ʻia.
(2:) Hoʻohui i 6500Kg o ka mea hoʻoheheʻe i ka reactor (ʻo ka lākiō o isopropanol i toluene i loko o ka solvent ma kahi o 15/85); e kaomi i ka alkali i loko o ka reactor, a pīpī i 200Kg o ka mea hoʻoheheʻe i ka pahu alkali ma hope o ke kaomi ʻana i ka alkali. Holoi i ka paipu; Hoʻomaʻalili ʻia ka ipu aniani i ka 23 ° C, a hoʻohui ʻia ka pulupulu hoʻomaʻemaʻe ʻia (800Kg). Ma hope o ka hoʻohui ʻia ʻana o ka pulupulu i hoʻomaʻemaʻe ʻia, 600Kg o ka mea hoʻoheheʻe ʻia e hoʻomaka i ka hopena alkalization. Pono ka hoʻohui ʻana o ka pulupulu hoʻomaʻemaʻe ʻia i loko o ka manawa i ʻōlelo ʻia (7 mau minuke) (he mea nui ka lōʻihi o ka manawa hoʻohui). Ke komo ka pulupulu i hoʻomaʻemaʻe ʻia me ka hoʻonā alkali, hoʻomaka ka hopena alkaliization. Inā lōʻihi loa ka manawa hānai, ʻokoʻa ke degere o ka alkalization ma muli o ka manawa e komo ai ka pulupulu i hoʻomaʻemaʻe ʻia i ka ʻōnaehana pane, e hopena i ka alkalization uneven a me ka hoʻohaʻahaʻa ʻana o ka huahana. I ka manawa like, e hoʻopili ʻia ka cellulose alkali me ka ea no ka manawa lōʻihi e hoʻoneʻe a hoʻohaʻahaʻa, e hopena i ka emi ʻana o ka viscosity o ka huahana. No ka loaʻa ʻana o nā huahana me nā pae viscosity like ʻole, hiki ke hoʻohana ʻia ka vacuum a me ka nitrogen i ka wā o ke kaʻina hana alkalization, a i ʻole hiki ke hoʻohui ʻia kekahi nui o ka antioxidant (dichloromethane). Mālama ʻia ka manawa alkaliization ma 120min, a mālama ʻia ka mahana ma 20-23 ℃.
(3:) Ma hope o ka pau ʻana o ka alkalization, e hoʻohui i ka nui o ka etherifying agent (methyl chloride a propylene oxide), e hoʻokiʻekiʻe i ka mahana i ka mahana i ʻōlelo ʻia a hoʻokō i ka hopena etherification i loko o ka manawa i ʻōlelo ʻia.
Nā kūlana etherification: 950Kg o ka methyl chloride a me 303Kg o propylene oxide. E hoʻohui i ka mea hana etherification a hoʻomaha a hoʻoulu no 40 mau minuke a laila hoʻonui i ka mahana. ʻO ka mahana etherification mua he 56 ° C, ʻo ka manawa wela mau ʻo 2.5h, ʻo ka lua etherification wela ʻo 87 ° C, a ʻo ka mahana mau ʻo 2.5h. Hiki ke hoʻomau i ka hopena hydroxypropyl ma kahi o 30 ° C, ʻoi aku ka wikiwiki o ka hopena ma 50 ° C, lohi ka hopena methoxylation ma 60 ° C, a ʻoi aku ka nāwaliwali ma lalo o 50 ° C. ʻO ka nui, ka nui a me ka manawa o ka methyl chloride a me ka propylene oxide, a me ka piʻi ʻana o ka mahana o ke kaʻina hana etherification, pili pono i ke ʻano o ka huahana.
ʻO nā mea hana nui no ka hanaʻana i ka HPMC he reactor, dryer, granulator, pulverizer, etc. I kēia manawa, nui nā mea hana haole e hoʻohana i nā mea hana i hanaʻia ma Germany. ʻAʻole hiki ke hoʻokō i nā pono o ka hana HPMC kiʻekiʻe.
Hiki i ka All-In-One Reactor i hana ʻia ma Kelemania ke hoʻopau i nā kaʻina hana he nui me ka mea hoʻokahi, ʻike i ka mana ʻakomi, ka maikaʻi o ka huahana paʻa, a me nā hana hana palekana a hilinaʻi.
ʻO nā mea waiwai nui no ka hana ʻana i ka HPMC he pulupulu hoʻomaʻemaʻe, sodium hydroxide, methyl chloride, a me propylene oxide.
Ka manawa hoʻouna: Nov-11-2021