izindlela zokuhlola
Igama lendlela: i-hypromellose-ukunqunywa kweqembu le-hydroxypropoxy-ukunqunywa kweqembu le-hydroxypropoxy
Ububanzi bokusebenza: Le ndlela isebenzisa indlela yokunquma i-hydroxypropoxy ukuze inqume okuqukethwe kwe-hydroxypropoxy ku-hypromellose. Le ndlela isetshenziswa ku-hypromellose.
Isimiso sendlela:Bala i-okuqukethwe kwe-hydroxypropoxy kumkhiqizo wokuhlola ngokuya kwendlela yokunquma i-hydroxypropoxy.
I-Reagent:
1. 30% (g/g) isixazululo se-chromium trioxide
2. I-Hydrooxide
3. Isixazululo senkomba ye-Phenolphthalein
4. I-sodium bicarbonate
5. Nciphisa i-sulfuric acid
6. Iodide ye-Potassium
7. Isixazululo se-sodium thiosulfate titration (0.02mol/L)
8. Isixazululo senkomba yesitashi
okokusebenza:
Ukulungiswa kwesampula:
1. Isixazululo se-sodium hydroxide titration (0.02mol/L)
Ukulungiselela: Thatha u-5.6mL wesisombululo se-sodium hydroxide ecacile, engeza amanzi abandayo asanda kubiliswa ukuze abe ngu-1000mL.
Ukulinganisa: Thatha cishe u-6g we-potassium hydrogen phthalate evamile omisiwe ku-105°C ukuze ube nesisindo esingashintshi, yikale ngokunembile, engeza u-50mL wamanzi abandayo asanda kubiliswa, unyakazise ukuze ancibilike ngangokunokwenzeka; engeza amaconsi angu-2 esisombululo senkomba ye-phenolphthalein, sebenzisa le-titration ye-Liquid, lapho usondela endaweni yokugcina, i-potassium hydrogen phthalate kufanele ichithwe ngokuphelele, futhi ifakwe kuze kube yilapho isisombululo siba pink. Njalo nge-1mL yesisombululo se-sodium hydroxide titration (1mol/L) ilingana no-20.42mg we-potassium hydrogen phthalate. Bala ukugxila kwalesi sixazululo ngokusekelwe ekusetshenzisweni kwalesi sixazululo kanye nenani le-potassium hydrogen phthalate elithathiwe. Kakhulu hlanza izikhathi ezi-5 ukwenza ukugxila kube ngu-0.02mol/L.
Isitoreji: Yifake ebhodleleni lepulasitiki le-polyethylene futhi uligcine livaliwe; kunezimbobo ezi-2 kupulaki, kanye neshubhu lengilazi elingu-1 lifakwa emgodini ngamunye, ishubhu eli-1 lixhunywe neshubhu le-soda lime, bese kusetshenziswa ishubhu elilodwa ukumunca uketshezi.
2. Isixazululo senkomba ye-Phenolphthalein Thatha i-1g ye-phenolphthalein, engeza u-100mL we-ethanol ukuze uhlakaze
3. Isixazululo se-sodium thiosulfate titration (0.02mol/L) Ukulungiselela: Thatha u-26g we-sodium thiosulfate kanye no-0.20g we-anhydrous sodium carbonate, engeza inani elifanele lamanzi abandayo asanda kubiliswa ukuze uncibilike abe ngu-1000mL, unyakazise kahle, futhi ubeke isihlungi senyanga engu-1. Ukulinganisa: thatha cishe u-0.15g we-potassium dichromate evamile omisiwe ku-120 ° C enesisindo esingashintshi, uyikale ngokunembile, uyibeke ebhodleleni le-iodine, engeza u-50mL wamanzi ukuze uncibilike, engeza u-2.0g we-potassium iodide, unyakazise ngobumnene ukuze uncibilike, engeza u-40mL we-searic acid, i-sulfuric dilute kahle; ngemva kwemizuzu engu-10 endaweni emnyama, engeza u-250mL wamanzi ukuze uhlanjululwe, futhi lapho isixazululo sisikiwe eduze nendawo yokugcina, engeza u-3mL wesisombululo senkomba yesitashi, qhubeka nokubhala kuze kube yilapho umbala oluhlaza unyamalala futhi uba luhlaza ngokugqamile, futhi umphumela wokulinganisa usetshenziswa njengendlela yokulungiswa kwesivivinyo esingenalutho. Njalo nge-1mL ye-sodium thiosulfate (0.1mol/L) ilingana no-4.903g we-potassium dichromate. Bala ukugxila kwesixazululo ngokuya ngokusetshenziswa kwesixazululo kanye nenani le-potassium dichromate elithathiwe. Kakhulu hlanza izikhathi ezi-5 ukwenza ukugxila kube ngu-0.02mol/L. Uma izinga lokushisa lekamelo lingaphezu kuka-25°C, izinga lokushisa lesixazululo sokuphendula kanye namanzi okuhlanjululwa kufanele apholise libe ngu-20°C.
4. Isixazululo senkomba yesitashi Thatha u-0.5g wesitashi esincibilikayo, engeza u-5mL wamanzi futhi ugovuze kahle, bese uthela kancane kancane ku-100mL wamanzi abilayo, ugovuze njengoba wengezwa, qhubeka ubilise imizuzu engu-2, ake upholile, uthele amandla angaphezu kwamandla, futhi sekulungile.
Lesi sixazululo kufanele silungiswe kabusha ngaphambi kokusetshenziswa.
Izinyathelo zokusebenza: Thatha u-0.1g walo mkhiqizo, ukale ngokunembile, uwubeke ebhodleleni lokuhluza i-distillation D, engeza u-10mL ka-30% (g/g) wesisombululo se-cadmium trichloride. Gcwalisa ishubhu B ekhiqiza isitimu ngamanzi ejoyintini, bese uxhuma iyunithi yokugaya. Gxilisa kokubili u-B no-D endaweni yokugeza kawoyela (kungaba i-glycerin), yenza izinga loketshezi lokugeza likawoyela lihambisane nezinga eliwuketshezi lesixazululo se-cadmium trichloride ebhodleleni D, uvule amanzi okupholisa, futhi uma kunesidingo, vumela umfudlana we-nitrogen ugeleze futhi ulawule izinga lokugeleza kwawo libe ibhamuza elingu-1 ngomzuzwana. Phakathi nemizuzu engama-30, phakamisa izinga lokushisa lokugeza lamafutha libe ku-155ºC, futhi ugcine lokhu kushisa kuze kuqoqwe u-50 mL we-distillate, khipha ishubhu le-condenser kukholomu ye-fractionation, hlambulula ngamanzi, geza bese ufaka esixazululweni esiqoqiwe, engeza amaconsi ama-3 e-phenolphthalein indicator solution, bese u-titrate nge-asidi engu-6 nge-pH 7. imitha), rekhoda umthamo odliwe we-V1 (mL), bese wengeza u-0.5g we-sodium bicarbonate no-10mL we-dilute sulfuric acid, uyiyeke ime kuze kuphele i-carbon dioxide, engeza u-1.0g we-potassium iodide, bese uyivala , Shake kahle, beka ebumnyameni imizuzu engu-5, engeza i-1mL ye-sodium indicator solution solution, i-sodium sultrate solution 1mL. (0.02mol/L) kuze kube sekugcineni, qopha umthamo osetshenzisiwe we-V2 (mL). Kwesinye isivivinyo esingenalutho, rekhoda imiqulu ye-Va ne-Vb (mL) yesisombululo se-sodium hydroxide titration (0.02mol/L) ne-sodium thiosulfate titration solution (0.02mol/L) ngokulandelana.
Isikhathi sokuthumela: Apr-25-2024