Ko te kaupapa tauhohenga o te cellulose ether hydroxypropyl methyl cellulose: ko te hanga o te HPMC hydroxypropyl methyl cellulose e whakamahi ana i te methyl chloride me te propylene oxide hei kaihoko etherification.Ko te whārite tauhohenga matū ko: Rcell-OH (miro parakore) + NaOH (sodium hydroxide) , Sodium hydroxide) + CspanCl (methyl chloride) + CH2OCHCspan (propylene oxide) → Rcell-O -CH2OHCHCspan (hydroxypropyl methylcellulose) + NaCl (konukawata) ) + H2O (wai)
Rere tukanga:
te miro parakore te kuru—te whakamaroke—te whangai—te whakakorikori—te whakaeo—te whakaora whakarewa me te horoi—te wehenga centrifugal—te whakamaroke—te kuru—whakaranu—Te takai hua
1: Ko nga rauemi mata me nga taonga awhina mo te hanga o te hydroxypropyl methylcellulose Ko te rauemi mata matua he miro parakore, a ko nga taonga awhina he konutai hydroxide (konutai hydroxide), propylene oxide, methyl chloride, waikawa acetic, toluene, isopropanol, me te hauota.Ko te kaupapa o te kuru miro parakore ko te whakangaro i te hanganga whakahiato o te miro parakore na roto i te kaha miihini ki te whakaiti i te tioata me te tohu polymerization me te whakanui ake i te waahi o te mata.
2: Te ine me te mana o te kounga o te rauemi mata: I raro i te kaupapa o etahi taputapu, ko te kounga o nga rauemi mata matua me nga awhina me te tauwehenga o te moni taapiri me te kukū o te whakarewa ka pa tika ki nga momo tohu o te hua.He nui te wai kei roto i te punaha tukanga whakaputa, a, ko te wai me nga whakarewa pararopi e kore e tino marara, a ko te marara o te wai ka pa ki te tohatoha o te alkali i roto i te punaha.Ki te kore e tino whakakorikoria, ka kino ki te whakamaaramatanga o te taurite me te whakaetere o te cellulose.
3: Te whakakorikori me te whakawhiti papatipu me te wera wera: Ko te whakakorikori o te cellulose me te whakaetere ka mahia katoa i raro i nga tikanga rerekee (te whakaoho i te kaha o waho).Ahakoa ko te marara me te whakapiri tahi o te wai, te kawakore, te miro para parakore me te kaihoko etherifying i roto i te punaha whakarewa he tino rite, ka pa tika ki nga paanga o te alkaliization me te etherification.Ko te whakakorikori koretake i te wa o te mahi whakamaaramatanga ka puta he tioata alkali me te rerenga i raro o nga taputapu.He iti te kukū o te paparanga o runga, a, kaore i te rawaka te whakamaaramatanga.Ko te mutunga, he nui tonu te kawakore kore utu i roto i te punaha i muri i te otinga o te etherification.Ko te riterite, ka hua mai he ngoikore te marama, he nui ake nga muka kore utu, he ngoikore te pupuri i te wai, he iti te tohu kara, me te uara PH teitei.
4: Tukatuka whakaputa (te mahi hanga slurry)
(1:) Taapirihia te nui o te kawakore totoka (790Kg) me te wai (te wai katoa o te punaha 460Kg) ki roto i te kettle houra, whakaohokia me te whakamahana ki te 80 nga nekehanga mo te neke atu i te 40 meneti, ka mutu te kawakore totoka. rewa.
(2:) Tāpirihia te 6500Kg o te whakarewa ki te reactor (ko te ōwehenga o te isopropanol ki te toluene i roto i te whakarewa he 15/85 pea);pehia te alkali ki roto i te reactor, ka rehu 200Kg o te whakarewa ki te tank alkali i muri i te pehi i te alkali.Horoia te paipa;ka whakamataohia te hohenga tauhohenga ki te 23°C, ka tapirihia te miro parakore (800Kg).Whai muri i te taapiri i te miro parakore, ka mapuhia te 600Kg o te whakarewa hei timata i te tauhohenga waikore.Ko te taapiri o te miro para parakore me whakaoti i roto i te waa kua tohua (7 meneti) (he mea nui te roa o te wa taapiri).Kia uru mai te miro parakore ki te otinga kawakore, ka timata te tauhohenga waikore.Mena he roa rawa te wa whangai, ka rereke te tohu o te whakamaaramatanga na te wa e uru ai te miro parakore ki te punaha tauhohenga, ka puta te koretake o te waikore me te whakaheke i te riterite o nga hua.I te wa ano, ka waiho te cellulose alkali ki te whakapiri ki te hau mo te wa roa ki te oxidize me te whakaheke, ka puta te heke o te pokey o te hua.Kia whiwhi ai i nga hua he rereke nga taumata pokey, ka taea te whakamahi i te hauhau me te hauota i te wa o te mahi whakamaaramatanga, ka taea ranei te taapiri i etahi momo antioxidant (dichloromethane).Ka whakahaeretia te wa whakamaaramatanga i te 120min, ka mau te pāmahana ki te 20-23 ℃.
(3:) Ka mutu te whakamaaramatanga, taapirihia te nui o te kaihoko whakaetere (methyl chloride me te propylene oxide), whakanekehia te pamahana ki te pāmahana kua tohua me te kawe i te tauhohenga etherification i roto i te waa kua tohua.
Nga tikanga whakamaarama: 950Kg o te methyl chloride me te 303Kg o te propylene oxide.Tāpirihia te māngai etherification me te whakamatao me te whakaoho mo te 40 meneti ka whakaara ake i te pāmahana.Ko te pāmahana whakawera tuatahi ko te 56°C, ko te 2.5h te wa mahana, ko te 87°C te pāmahana etherification tuarua, me te 2.5h te pāmahana.Ka taea e te tauhohenga hydroxypropyl te haere i te 30°C, ka tere te tere o te tauhohenga i te 50°C, ka puhoi te tauhohenga methoxylation i te 60°C, ka ngoikore ake i raro i te 50°C.Ko te nui, te wahanga me te wa o te methyl chloride me te propylene oxide, me te mana o te pikinga o te pāmahana o te tukanga etherification, ka pa tika ki te hanganga hua.
Ko nga taputapu matua mo te whakaputa HPMC ko te reactor, dryer, granulator, pulverizer, me etahi atu I tenei wa, he maha nga kaihanga o waho e whakamahi ana i nga taputapu i hangaia i Germany.Ko nga taputapu a-whare, ahakoa he kaha whakangao, he kounga whakangao ranei, kaore e taea te whakatutuki i nga hiahia o te hanga HPMC kounga teitei.
Ka taea e te Reactor Katoa-I-Kotahi i hangaia i Tiamana te whakaoti i nga waahanga mahi maha me te taputapu kotahi, ka mohio ki te whakahaere aunoa, te kounga hua o te hua, me nga mahi whakangao haumaru me te pono.
Ko nga rawa matua mo te hanga HPMC he miro para, te konutai waikawa, te methyl chloride, me te propylene oxide.
Wā tuku: Nov-11-2021