Hyphophorous acid yog dab tsi?
Hypophosphorous Acid(hypophosphorous acid, tshuaj formula H3PO2) yog cov kua tsis muaj xim nrog lub cev tshwj xeeb, yooj yim soluble hauv dej, cawv thiab ether, me ntsis soluble hauv alkane cov kuab tshuaj.
Cov hauv qab no yog ob peb txoj kev hluavtaws ntawm Hypophosphorous Acid (hypophosphorous acid):
1. Phosphorus hydroxide txo txoj hauv kev haus cawv: Dissolve phosphorus hydroxide hauv ethanol lossis isopropanol, ntxiv hydrogen, thiab tsim cov kua qaub hypophosphorous nyob rau hauv qhov kev ua ntawm catalyst.
(1) Npaj reactants: sib tov phosphorous hydroxide thiab cawv (xws li ethanol, isopropanol, thiab lwm yam) nyob rau hauv ib qho kev faib ua feem los ua ib qho kev daws teeb meem. Feem ntau, cov molar ratio ntawm reactants yog phosphorous hydroxide: cawv=1:2.
(2) Ntxiv cov catalyst: ntxiv qhov tsim nyog ntawm catalyst, xws li palladium chloride, rau cov reactant, thiab do sib npaug.
(3) Qhia hydrogen: ua kom sov cov tshuaj tiv thaiv rau 60-70 degree , thiab infuse hydrogen. Nyob rau hauv qhov kev txiav txim ntawm cov catalyst, cov hydrogen yuav txo cov phosphorous hydroxide rau hypophosphorous acid. Cov tshuaj sib npaug rau cov tshuaj tiv thaiv yog:
P (OH)3plus 3 H2 → H3PO2plus 3 H2O
(4) Kev sib cais thiab kev ua kom huv: tom qab cov tshuaj tiv thaiv, cov khoom siv tshuaj tiv thaiv raug cais thiab ua kom huv. Feem ntau, txoj hauv kev xws li distillation thiab crystallization tuaj yeem siv tau kom tau txais cov ntshiab hypophosphorous acid.
Nws yuav tsum tau muab sau tseg tias tsis xws li qhov kub thiab txias thiab hydrogen txaus tus nqi yuav tsum tau tswj thaum lub sij hawm cov txheej txheem tshuaj tiv thaiv kom tsis txhob muaj ntau sab thiab pov tseg. Nyob rau tib lub sijhawm, kev xaiv thiab qhov sib ntxiv ntawm cov catalyst tseem yuav cuam tshuam rau cov tshuaj tiv thaiv kev ua haujlwm thiab cov khoom zoo, uas yuav tsum tau kho raws li qhov xwm txheej tshwj xeeb.
2. Phosphoric acid txo txoj kev: react phosphoric acid nrog ib tug txo tus neeg sawv cev (xws li ferrous sulfate, sodium sulfite, thiab lwm yam) nyob rau hauv acidic tej yam kev mob los tsim hypophosphorous acid thiab phosphate. Hypophosphorous acid yog ces cais thiab purified los ntawm cov txheej txheem txheej txheem xws li distillation thiab crystallization.
(1) Npaj reactants: sib tov phosphoric acid thiab txo cov neeg ua haujlwm (xws li ferrous sulfate, sodium sulfite, thiab lwm yam) nyob rau hauv ib qho kev faib ua feem los ua cov tshuaj tiv thaiv. Feem ntau, cov molar ratio ntawm reactants yog phosphoric acid: txo tus neeg sawv cev=1: 2.
(2) Kho acidity: kho cov tshuaj tiv thaiv rau acidic tej yam kev mob, feem ntau yog siv concentrated sulfuric acid los yog hydrochloric acid los kho cov pH txog li 1.
(3) Kev txo qis: Kub cov tshuaj tiv thaiv rau 60-70 degree thiab do sib npaug, thiab tus neeg sawv cev txo qis yuav txo cov phosphoric acid rau hypophosphorous acid nyob rau hauv acidic tej yam kev mob. Cov tshuaj sib npaug rau cov tshuaj tiv thaiv yog:
H3PO4ntxiv 2 FeSO4plus 4 H2YOG4→ 2 FeSO4ntxiv H3PO2plus 4 H2O plus 2 SO2
(4) Kev sib cais thiab kev ua kom huv: tom qab cov tshuaj tiv thaiv, cov khoom siv tshuaj tiv thaiv raug cais thiab ua kom huv. Feem ntau, txoj hauv kev xws li distillation thiab crystallization tuaj yeem siv tau kom tau txais cov ntshiab hypophosphorous acid.
Nws yuav tsum tau muab sau tseg tias tsis muaj xws li kub thiab tshuaj tiv thaiv lub sij hawm yuav tsum tau tswj thaum lub sij hawm cov tshuaj tiv thaiv kom tsis txhob muaj ntau sab thiab pov tseg. Nyob rau tib lub sijhawm, kev xaiv thiab qhov sib ntxiv ntawm tus neeg sawv cev txo qis yuav cuam tshuam rau cov tshuaj tiv thaiv kev ua haujlwm thiab cov khoom zoo, uas yuav tsum tau hloov kho raws li qhov xwm txheej tshwj xeeb. Tsis tas li ntawd, cov roj sulfur dioxide uas tsim los ntawm cov tshuaj tiv thaiv yog tshuaj lom thiab khaus, thiab yuav tsum tau kho kom zoo thiab tawm mus.
3. Sulfuric acid txo txoj kev: react sulfuric acid, sodium sulfite thiab phosphoric acid nyob rau hauv acidic tej yam kev mob los tsim hypophosphorous acid thiab sulfate. Lub hypophosphorous acid yog sib cais thiab purified los ntawm distillation thiab crystallization thiab lwm yam txheej txheem txheej txheem.
(1) Npaj cov tshuaj reactants: Sib tov sulfuric acid thiab txo tus neeg sawv cev (xws li sodium sulfite, thiab lwm yam) nyob rau hauv ib qho kev faib ua feem los ua cov tshuaj tiv thaiv. Feem ntau, cov molar ratio ntawm reactants yog sulfuric acid: txo tus neeg sawv cev=1: 2.
(2) Kho acidity: kho cov tshuaj tiv thaiv rau acidic tej yam kev mob, feem ntau yog siv concentrated sulfuric acid los yog hydrochloric acid los kho cov pH txog li 1.
(3) Kev txo qis: Kub cov tshuaj tiv thaiv rau 60-70 degree thiab do sib npaug. Tus neeg sawv cev txo qis txo cov oxidizing cov ntsiab lus hauv sulfuric acid rau sulfurous acid nyob rau hauv acidic tej yam kev mob. Sulfurous acid ntxiv txo phosphoric acid rau hypophosphorous acid. Cov tshuaj sib npaug rau cov tshuaj tiv thaiv yog:
H2YOG4plus Na2YOG3→ Na2YOG4ntxiv H2O plus SO2
H3PO4plus2 ua2YOG3plus 2 H2YOG4→ 2 Na2YOG4plus H3PO2plus 2 H2O plus 2 SO2
(4) Kev sib cais thiab kev ua kom huv: tom qab cov tshuaj tiv thaiv, cov khoom siv tshuaj tiv thaiv raug cais thiab ua kom huv. Feem ntau, txoj hauv kev xws li distillation thiab crystallization tuaj yeem siv tau kom tau txais cov ntshiab hypophosphorous acid.
4. Sodium hydroxide txo txoj kev: react sodium hydroxide, phosphoric acid thiab txo tus neeg sawv cev (xws li sodium sulfite, thiab lwm yam) nyob rau hauv acidic tej yam kev mob los tsim hypophosphorous acid thiab phosphate. Hypophosphorous acid yog ces cais thiab purified los ntawm cov txheej txheem txheej txheem xws li distillation thiab crystallization.
(1) Npaj cov tshuaj reactants: sib tov hypophosphorous acid thiab sodium hydroxide nyob rau hauv ib qho kev faib ua feem los ua cov tshuaj tiv thaiv. Feem ntau, cov molar ratio ntawm reactants yog hypophosphorous acid: sodium hydroxide=1: 2.
(2) Dissolving lub reactant: Ntxiv cov reactant mus rau ib tug tsim nyog tus nqi ntawm cov dej thiab do ib tug sib npaug zos rau tag nrho dissolve nws. Feem ntau, cov reactant tuaj yeem muab ntxiv rau hauv dej thiab ua kom sov li 60 degree kom txog thaum cov reactant yaj tag.
(3) Ntxiv tus neeg sawv cev txo qis: Ntxiv qhov tsim nyog ntawm tus neeg txo qis (xws li sodium hydroxide lossis sodium carbonate) rau hauv cov tshuaj tiv thaiv. Lub sijhawm no, cov tshuaj tiv thaiv yuav pib tshwm sim, thiab cov roj hydrogen ntau yuav hloov zuj zus.
(4) Tswj cov tshuaj tiv thaiv kab mob: Txhawm rau kom tsis txhob muaj hydrogen ntau dhau, cov kua dej me me ntawm sodium hydroxide lossis sodium carbonate tuaj yeem ntxiv los tswj cov tshuaj tiv thaiv. Tsis tas li ntawd, nws tseem yuav tsum tau tswj cov tshuaj tiv thaiv kub, uas feem ntau tswj tau ntawm li 60 degree.
(5) Lim: Tom qab cov tshuaj tiv thaiv, cov tshuaj tiv thaiv sib xyaw yog lim kom tshem tawm cov impurities thiab cov tshuaj tsis muaj tshuaj. Tom qab kev pom, cov xim tsis muaj xim thiab pob tshab hypophosphorous acid daws yuav tau.
(6) Distillation: Distilled cov tshuaj hypophosphorous acid kom tau txais cov ntshiab hypophosphorous acid.
Hypophosphorous Acid (hypophosphorous acid, tshuaj formula H3PO2) muaj qee yam tshuaj tshwj xeeb, cov hauv qab no yog qee yam ntawm nws cov khoom tseem ceeb:
1. Kev txo qis: Hypophosphorous acid yog ib qho tsis muaj zog txo tus neeg sawv cev, uas tuaj yeem txo qee yam hlau ions rau cov hlau, xws li Agntxiv, Cu2 plus, thiab lwm yam. Nws tuaj yeem txo cov ntsiab lus hauv ntau lub xeev oxidation, xws li selenium, tellurium, thiab chromium.
2. Oxidation: Thaum hypophosphorous acid yog oxidized, nws yuav decompose rau hauv phosphoric acid thiab phosphate, thiab tso hydrogen gas tib lub sij hawm.
3. Corrosivity: Hypophosphorous acid muaj qee yam corrosiveness thiab tuaj yeem corrode hlau thiab organic tshuaj. Nyob rau hauv ntau dua, nws tuaj yeem corrode cov ntaub ntawv xws li iav thiab ceramics.
4. Reactivity: Hypophosphorous acid yog ib qho yooj yim rau react nrog lwm yam tshuaj. Piv txwv li, nws tuaj yeem hnov mob nrog alkali thiab alkaline ntiaj teb hlau hydroxides los tsim cov phosphates thiab dej.
Hauv cov ntsiab lus, hypophosphorous acid yog qhov txo qis, oxidizing, thiab corrosive tshuaj uas yuav tsum tau ceev faj tuav thiab khaws cia.
Qee qhov teeb meem txog tus nqi Hypophosphoric Acid:
Peb yog cov chaw tsim khoom ntawm hypophosphoric acid, thiab peb muaj hypophosphoric acid rau kev muag khoom. Thov xa email tuaj rau peb lub tuam txhab muag khoom kom peb tuaj yeem tsim qauv kev thauj mus los uas tsim nyog rau koj.