Izina ryuburyo: hypromellose - kugena hydroxypropoxy - kugena hydroxypropoxy
Igipimo cyo gusaba: Ubu buryo bukoresha uburyo bwa hydroxypropoxy bwo kugena kugirango umenye ibikubiye muri hydroxypropoxy muri hypromellose.
Ubu buryo burakoreshwa kuri hypromellose.
Ihame ryuburyo: Kubara ibikubiye muri hydroxypropoxy mubicuruzwa byipimishije ukurikije uburyo bwo kumenya hydroxypropoxy.
Reagent:
1. 30% (g / g) chromium trioxide igisubizo
2. Sodium hydroxide titre yumuti (0.02mol / L)
3. Igisubizo cyerekana ibimenyetso bya Fenolphthalein
4. Sodium bicarbonate
5. Koresha aside sulfurike
6. Iyode ya Potasiyumu
7. Sodium thiosulfate titre yumuti (0.02mol / L)
8. Igisubizo cyerekana ibipimo
ibikoresho:
Icyitegererezo: 1. Sodium hydroxide titre igisubizo (0.02mol / L)
Gutegura: Fata 5.6mL yumuti wuzuye wa sodium hydroxide wuzuye, ongeramo amazi akonje yatetse mashya kugirango ube 1000mL.
Calibration: Fata hafi 6g ya potasiyumu hydrogen phthalate yumye kuri 105 ° C kugirango uburemere buhoraho, ubipime neza, ongeramo 50mL y'amazi akonje yatetse vuba, uzunguze kugirango ushonga bishoboka; ongeramo ibitonyanga 2 byerekana igisubizo cya fenolphthalein, koresha iyi titre ya Liquid, mugihe wegereye iherezo, potasiyumu hydrogen phthalate igomba gushonga burundu, hanyuma ikitirirwa kugeza igisubizo kibaye umutuku. Buri 1mL ya sodium hydroxide titre yumuti (1mol / L) ihwanye na 20.42mg ya potasiyumu hydrogen phthalate. Kubara ubunini bwiki gisubizo ukurikije ikoreshwa ryiki gisubizo hamwe na potasiyumu hydrogen phthalate yafashwe. Ubwinshi bwinshyi inshuro 5 kugirango intumbero 0.02mol / L.
Ububiko: Shyira mu icupa rya plastike polyethylene hanyuma ugumane kashe; hari ibyobo 2 mumacomeka, hanyuma umuyoboro wikirahure 1 winjizwa muri buri mwobo, umuyoboro 1 uhujwe numuyoboro wa soda, naho umuyoboro 1 ukoreshwa mukunyunyuza amazi.
2. Igisubizo cya Fenolphthalein
Fata 1g ya phenolphthalein, ongeramo 100mL ya Ethanol kugirango ushonga
3. Sodium thiosulfate titre yumuti (0.02mol / L)
Gutegura: Fata 26g ya sodiumi thiosulfate na 0,20g ya karubone ya sodium ya anhydrous, ongeramo urugero rukwiye rwamazi akonje yatetse kugirango ushonge muri 1000mL, uzunguze neza, hanyuma uyungurure nyuma yo guhagarara ukwezi.
Calibration: fata hafi 0.15g ya potasiyumu dichromate yumye yumye kuri 120 ° C hamwe nuburemere burigihe, uyipime neza, uyishyire mumacupa ya iyode, ongeramo 50mL yamazi kugirango ushonga, ongeramo 2.0g ya iyode ya potasiyumu, uzunguze buhoro kugirango ushonga, wongereho 40mL ya acide sulfurike, Kunyeganyeza neza no gufunga neza; nyuma yiminota 10 ahantu hijimye, ongeramo 250mL yamazi kugirango uyunguruze, kandi mugihe igisubizo cyitiriwe hafi yumwanya wanyuma, ongeramo 3mL yumuti werekana ibisubizo, komeza titre kugeza ibara ryubururu ryabuze kandi rihinduka icyatsi kibisi, nigisubizo cya titre ikoreshwa nkikosorwa ryikigereranyo. Buri 1mL ya sodiumi thiosulfate (0.1mol / L) ihwanye na 4.903g ya potasiyumu dichromate. Kubara ubunini bwibisubizo ukurikije ikoreshwa ryumuti nubunini bwa potasiyumu dichromate yafashwe. Ubwinshi bwinshyi inshuro 5 kugirango intumbero 0.02mol / L.
Niba ubushyuhe bwicyumba buri hejuru ya 25 ° C, ubushyuhe bwumuti wa reaction hamwe namazi ya dilution bigomba gukonjeshwa kugeza kuri 20 ° C.
4. Igisubizo cyerekana ibipimo
Fata 0.5g ya krahisi ishonga, ongeramo 5mL y'amazi hanyuma ukangure neza, hanyuma usuke buhoro muri 100mL y'amazi abira, koga nkuko wongeyeho, komeza uteke muminota 2, ureke bikonje, usuke ndengakamere, urabibona. Iki gisubizo kigomba gutegurwa gishya mbere yo gukoreshwa.
Intambwe yo gukora: Fata 0.1g yibi bicuruzwa, bipime neza, ubishyire mu icupa rya distillation D, ongeramo 10mL ya 30% (g / g) umuti wa kadmium trichloride. Uzuza umuyoboro utanga ibyuka B n'amazi kumahuriro, hanyuma uhuze igice cya distillation. Shira B na D byombi mu bwogero bwamavuta (birashobora kuba glycerine), kora urwego rwamazi yo kwiyuhagira amavuta rujyanye nurwego rwamazi yumuti wa kadmium trichloride mumacupa D, fungura amazi akonje, nibiba ngombwa, reka imigezi ya azote yinjira kandi igenzura umuvuduko wacyo kugeza 1 bubble kumasegonda. Mu minota 30, uzamure ubushyuhe bwo kwiyuhagira amavuta kuri 155ºC, hanyuma ukomeze ubu bushyuhe kugeza 50 mL ya distillate yegeranijwe, kura umuyoboro wa kondenseri kumurongo wacitsemo ibice, kwoza amazi, gukaraba no guhuza mumazi yakusanyije, ongeramo 3 ibitonyanga bya fenolphthalein yerekana igisubizo, hanyuma ukoreshe Titrate kugeza agaciro ka pH kangana na 6.9-7.1 (gipimwa na metero acide), andika ingano yakoreshejwe V1 (mL), hanyuma wongereho 0.5g ya sodium bicarbonate na 10mL ya acide sulfurike, reka. ihagarare kugeza igihe nta dioxyde de carbone izongera gukorwa, ongeramo 1.0g ya potasiyumu iyode, Funga neza, uyinyeganyeze neza, uyishyire ahantu hijimye muminota 5, ongeramo 1mL yumuti wibipimo bya krahisi, titre kugeza kumpera hamwe na titre ya sodium thiosulfate igisubizo (0.02mol / L), hanyuma wandike ingano yakoreshejwe V2 (mL). Mu kindi kizamini cyambaye ubusa, andika ingano ya Va na Vb (mL) ya sodium hydroxide yakoreshejwe (0.02mol / L) hamwe na sodium thiosulfate titre (0.02mol / L). Kubara ibirimo hydroxypropoxyl.
Igihe cyo kohereza: Apr-14-2023