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 whakamaarama—te whakaeo—te whakaora whakarewa me te horoi—te wehenga centrifugal—te whakamaroke—te kuru—te whakakotahitanga—te takai hua.
1: 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 (sodium 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 maatete whakaetere (methyl chloride me te propylene oxide), whakanekehia te pamahana ki te pāmahana i tohua ka mahia te tauhohenga whakaeera 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 56°C te paemahana whakawera tuatahi, ko te 2.5h te wa o te whakamahana, 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, he 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 All-In-One i hangaia i Tiamana te whakaoti i nga mahi maha me te taputapu kotahi, te 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