Tetrahydrofuran

Tetrahydrofuran, luv luv THF, yog ib qho heterocyclic organic compound. Koom nrog rau chav kawm ether, yog cov aromatic compound furan tiav hydrogenation khoom.

Tetrahydrofuran yog ib qho ntawm cov ethers polar muaj zog tshaj plaws. Nws yog siv ua cov tshuaj yaj polar nruab nrab hauv kev tshuaj lom neeg thiab kev rho tawm. Nws yog cov kua tsis muaj xim tsis hloov pauv ntawm chav tsev kub thiab muaj ntxhiab zoo li ether. Yaj hauv dej, ethanol, ether, acetone, Chemicalbook benzene thiab lwm yam organic solvents feem ntau, hu ua "universal solvent". Ntawm chav tsev kub thiab dej tuaj yeem sib xyaw ua ke ib nrab, qee lub lag luam reagent tsis raug cai yog siv qhov taw tes no los ua tetrahydrofuran reagent dej profiteer. Vim tias THF nyiam tsim cov peroxides hauv kev khaws cia, cov antioxidant BHT feem ntau yog ntxiv rau cov khoom lag luam. Cov dej noo ≦0.2%. Nws muaj cov yam ntxwv ntawm kev lom tsawg, qhov kub qis thiab cov kua dej zoo.

Cov khoom siv tshuaj lom neeg:kua tsis muaj xim pob tshab, nrog rau ntxhiab tsw ntawm ether. Sib xyaw nrog dej, cawv, ketone, benzene, ester, ether, thiab hydrocarbons.

Cov ntawv thov tseem ceeb:

1. Cov ntaub ntawv raw ntawm spandex synthesis reaction:

Tetrahydrofuran nws tus kheej tuaj yeem yog polycondensation (los ntawm cationic ring-opening repolymerization) rau hauv polytetramethylene ether diol (PTMEG), tseem hu ua tetrahydrofuran homopolyl. PTMEG thiab toluene diisocyanate (TDI) ua los ntawm kev hnav tsis kam, roj tsis kam, kev ua haujlwm kub qis, lub zog siab ntawm cov roj hmab tshwj xeeb; Block polyether polyester elastic khoom tau npaj nrog dimethyl terephthalate thiab 1, 4-butanediol. PTMEG nrog qhov hnyav molecular ntawm 2000 thiab p-methylene bis (4-phenyl) diisocyanate (MDI) los ua polyurethane elastic fiber (SPANDEX fiber), roj hmab tshwj xeeb thiab qee cov khoom siv tshwj xeeb txheej. Kev siv tseem ceeb tshaj plaws ntawm THF yog rau kev tsim cov PTMEG. Raws li cov ntaub ntawv txheeb cais, kwv yees li 80% ntawm THF thoob ntiaj teb yog siv rau kev tsim cov PTMEG, thiab PTMEG feem ntau yog siv rau kev tsim cov spandex fiber.

2. Cov kuab tshuaj uas muaj kev ua tau zoo heev:

Tetrahydrofuran yog ib qho tshuaj yaj zoo heev uas siv ntau, tshwj xeeb tshaj yog rau kev yaj PVC, polyvinylidene chloride thiab butyl aniline, dav siv ua txheej txheej saum npoo, txheej tiv thaiv xeb, luam ntawv number case, daim kab xev thiab zaj duab xis txheej tshuaj yaj, nrog Chemicalbook hauv electroplating txhuas kua tuaj yeem tswj tau qhov tuab ntawm txhuas txheej thiab ci. Cov tshuaj yaj rau daim kab xev txheej, PVC txheej saum npoo, ntxuav PVC reactor, tshem tawm PVC zaj duab xis, cellophane txheej, yas luam ntawv number case, thermoplastic polyurethane txheej, nplaum, feem ntau siv rau hauv txheej saum npoo, txheej tiv thaiv, number case, extractants thiab cov neeg sawv cev kho saum npoo rau tawv hluavtaws.

3. Siv ua cov khoom siv raw rau cov organic synthesis xws li tshuaj:

Rau kev tsim cov tetrahydrothiophene, 1.4-dichloroethane, 2.3-dichlorotetrahydrofuran, valerolactone, butyl lactone thiab pyrrolidone. Hauv kev lag luam tshuaj, nws yog siv rau hauv kev tsim cov tshuaj coughbixin, rifumycin, progesterone thiab qee cov tshuaj hormones. Tetrahydrothiophenol yog tsim los ntawm kev kho hydrogen sulfide, uas tuaj yeem siv ua tus neeg sawv cev tsw hauv roj roj (kev txheeb xyuas cov khoom ntxiv), thiab tseem yog cov kuab tshuaj tseem ceeb hauv kev lag luam tshuaj.

4. Lwm yam kev siv:

Chromatographic solvent (gel permeation chromatography), siv rau cov roj av tsw qab, acetylene extraction solvent, polymer khoom siv lub teeb stabilizer, thiab lwm yam. Nrog rau kev siv dav dav ntawm tetrahydrofuran, tshwj xeeb tshaj yog nyob rau xyoo tas los no, kev loj hlob sai ntawm kev lag luam polyurethane, qhov kev thov rau PTMEG hauv peb lub tebchaws nce ntxiv, thiab qhov kev thov rau tetrahydrofuran kuj qhia txog kev loj hlob sai.

Txaus Ntshai:Tetrahydrofuran yog ib hom kua uas yoo ...

Kev ceev faj ua haujlwm:Kev ua haujlwm kaw, cua nkag tag nrho. Cov neeg ua haujlwm yuav tsum tau kawm tshwj xeeb thiab ua raws li cov txheej txheem ua haujlwm. Nws raug pom zoo kom cov neeg ua haujlwm hnav lub ntsej muag roj lim (ib nrab lub ntsej muag), tsom iav tiv thaiv kev nyab xeeb, khaub ncaws tiv thaiv hluav taws xob, thiab hnab looj tes roj hmab uas tiv taus roj. Khaws cia kom deb ntawm hluav taws, qhov chaw kub, tsis txhob haus luam yeeb hauv chaw ua haujlwm. Siv cov tshuab cua thiab cov khoom siv uas tiv taus kev tawg. Tiv thaiv cov pa tawm mus rau hauv huab cua hauv chaw ua haujlwm. Tsis txhob kov cov oxidants, acids thiab bases. Yuav tsum tswj tus nqi ntws thaum lub sijhawm sau, thiab yuav tsum muaj lub cuab yeej av kom tiv thaiv kev sib sau ua ke ntawm hluav taws xob. Thaum tuav, yuav tsum tau thauj khoom me me thiab tshem tawm kom tiv thaiv kev puas tsuaj rau cov ntim khoom thiab cov thawv. Nruab nrog ntau yam thiab ntau npaum li cas ntawm cov khoom siv tua hluav taws thiab cov khoom siv kho mob thaum muaj xwm txheej ceev. Lub thawv khoob yuav muaj cov khoom seem tsis zoo.

Kev ceev faj txog kev khaws cia:Feem ntau cov khoom muaj cov tshuaj uas tiv thaiv tau. Khaws cia rau hauv qhov chaw txias thiab muaj cua nkag. Khaws cia kom deb ntawm hluav taws thiab cua sov. Qhov kub ntawm lub tsev rau khoom yuav tsum tsis pub tshaj 30 ℃. Lub pob yuav tsum kaw thiab tsis txhob sib cuag nrog huab cua. Nws yuav tsum khaws cia cais ntawm cov tshuaj oxidizing, acids thiab bases, thiab yuav tsum tsis txhob sib xyaw. Cov teeb pom kev zoo thiab cov cua nkag tau siv los tiv thaiv kev tawg. Tsis txhob siv cov khoom siv kho tshuab thiab cov cuab yeej uas yooj yim hluav taws. Qhov chaw khaws khoom yuav tsum muaj cov khoom siv kho qhov xau thiab cov ntaub ntawv tuav tsim nyog.

Ntim: 180KG / nruas