Formalin vs Formaldehyde
Tshuaj, ob qho tib si formalin thiab formaldehyde xa mus rau tib lub zog ua haujlwm, tab sis lawv txawv hauv cov qauv. Formaldehyde ua raws li cov tshuaj yooj yim, tab sis nws lub npe tau nyiam ntau lub ntsiab lus ua raws. Pib los ntawm nws cov tshuaj systematic lub npe uas yog 'methanal', nws tseem hu ua; Formalin, Formic Aldehyde, Paraform, Formol, Fyde, Formalith, Methylene Glycol, Methyl Aldehyde, Methylene Oxide, Oxomethane lwm yam.
Formaldehyde
Formaldehyde yog ib qho yooj yim, organic, tshuaj lom neeg sib xyaw uas yog nyob rau hauv pab pawg ua haujlwm hu ua 'aldehydes', yog li lub ntsiab lus. Nws tseem yog daim ntawv yooj yim tshaj plaws ntawm aldehyde tam sim no nrog cov tshuaj formula CH2O lossis HCHO thiab nyob rau hauv lub xeev gaseous ntawm chav tsev kub. Formaldehyde gas tsis muaj xim thiab muaj cov yam ntxwv tsw nrog pungent xwm.
Formaldehyde yog kev lag luam tsim los ntawm catalytic oxidation ntawm methanol (CH 3 OH). Silver catalysts feem ntau yog siv rau hauv cov txheej txheem no. Ua ib qho yooj yim organic compound, formaldehyde ua txoj hauv kev raws li cov khoom pib hauv cov tshuaj tiv thaiv organic ntau heev. Nws kuj yog siv nyob rau hauv ntau industrially tseem ceeb polymerization cov tshuaj tiv thaiv xws li urea-formaldehyde resin, phenol-formaldehyde resin thiab lwm yam. Formaldehyde kuj yog siv nyob rau hauv zus tau tej cov ntau yam ntawm plastics, ntaub crease-resistants nyob rau hauv lub textile kev lag luam, cov khoom siv rau lub cav cav. thiab lwm yam. Dilute cov kev daws teeb meem ntawm formaldehyde kuj yog siv los ua cov tshuaj tua kab mob thiab khaws cia cov kab mob lom. Raws li tau hais los saum toj no, formaldehyde qhia tau hais tias muaj xwm txheej nyuaj vim nws siv ntau hom ntawv los ntawm cyclization, polymerization lossis dissolution; Txawm li cas los xij, nws tseem qhia cov yam ntxwv ntawm tib yam li formaldehyde. Muab tag nrho cov txiaj ntsig txawm li cas los xij, formaldehyde paub tias yog tib neeg carcinogen thiab, qhov tseeb, yog tshuaj lom rau txhua tus tsiaj raws li raug rau formaldehyde tuaj yeem ua rau mob hnyav. Tsis tas li ntawd, cov kev daws teeb meem ntawm formaldehyde qhia tau hais tias muaj kev cuam tshuam zoo heev thiab formaldehyde tuaj yeem tsim cov tshuaj tsis muaj zog / tawg heev.
Formalin
Thaum yaj hauv dej, formaldehyde dhau hydration thiab tsim cov hydrate 'Methanediol' [CH2(OH)2] thiab muaj nyob rau hauv equilibrium nrog rau lwm cov ntaub ntawv ntawm formaldehyde polymer. Cov dej saturated uas muaj 40% formaldehyde los ntawm ntim los yog 37% formaldehyde los ntawm huab hwm coj yog hu ua ntshiab formalin los yog 100% formalin. Ib qho kev lag luam qib tshuaj formalin kuj tseem muaj txog 10-12% ntawm methanol thiab metallic compounds. Cov no ua cov stabilizers thiab tiv thaiv oxidation thiab polymerization ntawm formaldehyde hauv cov tshuaj formalin khaws cia nws cov haujlwm. Yog tias tsis ntxiv cov stabilizers, formaldehyde aqueous daws yog qhov tsis ruaj khov thiab yuav polymerize rau hauv cov molecules loj uas insoluble thiab yuav precipitate tawm ntawm cov tshuaj.
Thaum lub sijhawm tsim cov formaldehyde los ntawm methanol, dej kuj tseem tsim los ntawm cov khoom lag luam; yog li cov txheej txheem tuaj yeem tsim cov formalin ncaj qha thaum cov concentrations raug mus txog. Formalin feem ntau yog siv los khaws cov tsiaj txhu thiab cov ntaub so ntswg thiab ntau cov tshuaj diluted yog siv los ua tshuaj tua kab mob thiab tshuaj tua kab mob, piv txwv li los tua cov thoob dej yug ntses. Formalin kuj muaj cov ntxhiab tsw tsw zoo ib yam li formaldehyde. Tsis tas li ntawd, nws muaj cov yam ntxwv zoo sib xws ntawm formaldehyde raws li formalin nkag tau tawm cov roj formaldehyde thiab tseem yog cov nplaim taws heev.
Qhov txawv ntawm Formalin thiab Formaldehyde yog dab tsi?
• Formaldehyde yog ib qho tshuaj lom neeg yooj yim whereas formalin yog ib qho qauv ntawm formaldehyde hauv cov kua dej.
• Formaldehyde yog ib qho roj ntawm chav tsev kub, tab sis formalin yog kua.
• Formaldehyde yog ib qho aldehyde whereas, nyob rau hauv formalin, formaldehyde yog hydrated rau hauv cawv compound.
• Formalin feem ntau yog siv los ua cov tshuaj tua kab mob, tab sis formaldehyde yog cov khoom siv tseem ceeb hauv ntau cov txheej txheem tseem ceeb hauv kev tsim cov khoom tseem ceeb.
