Polyvinylamine yog dab tsi?
Polyacrylamide (abbreviated li PAM) tau muab faib ua cationic, anionic, thiab tsis yog - ionic hom, nrog rau qhov hnyav molecular li ntawm 4 lab txog 20 lab. Cov khoom no yog cov hmoov dawb uas yooj yim soluble hauv dej; Txawm li cas los xij, nws decomposes yooj yim thaum kub tshaj 120 degree. Polyacrylamide yog ib qho hluavtaws polymeric flocculant-feem ntau hu ua "Separan"- thiab belongs rau chav kawm ntawm polyelectrolytes. Nws yog dav siv nyob rau hauv cov khoom - cov txheej txheem sib cais kua ntawm leaching slurries ntawm uranium mills (xws li nyob rau hauv counter-tam sim no decantation ntxuav txheej txheem) los txhim kho cov kev qhia meej, sedimentation, thiab pom cov khoom ntawm slurry.
Khoom: Ib qho xim tsis muaj xim lossis daj daj xim av colloid. Nws yog dej-soluble resin uas tuaj yeem yaj hauv dej hauv txhua qhov kev faib ua feem. Hauv cov kuab tshuaj tsawg tsawg- xws li glacial acetic acid, acrylic acid, ethylene glycol, formamide, glycerol, thiab lactic acid- nws solubility tsuas yog kwv yees li 1%. Nws yuav luag tag insoluble hauv cov kuab tshuaj organic. Nws decomposes yooj yim thaum kub tshaj 120 degree.
Acrylamide yog synthesized los ntawm acrylonitrile nyob rau hauv lub xub ntiag ntawm tooj liab catalyst. Cov acrylamide tom qab ntawd dhau los ua polymerization nyob rau hauv lub xub ntiag ntawm K₂S₂O₈ (potassium persulfate) los ua polyacrylamide. Tom qab kev kho alkaline thiab ntxuav dej, tooj liab - aluminium alloy yog npaj los ua cov catalyst thiab thauj mus rau hauv lub reactor hydration. Lub acrylonitrile feedstock yog pumped rau hauv ib lub tank cia thiab tom qab ntawd muab rau hauv lub metering tank. Cov dej huv huv-uas tau dhau los ntawm ion- pauv kev kho mob- tau nkag mus rau hauv lub metering tank thiab tom qab ntawd txuas ntxiv mus rau hauv lub hydration reactor nyob rau hauv proportional ratio ntawm feedstock preheater.
Cov tshuaj tiv thaiv hydration pib ntawm qhov kub ntawm 85-125 degree, yielding aqueous tov ntawm acrylamide. Txhua qhov seem acrylonitrile raug xa mus los ntawm lub flash evaporator kem rov qab mus rau lub condenser, thiab tom qab ntawd ntws mus rau hauv lub tank ntsuas dej rau kev rov ua dua tshiab. Cov tshuaj acrylamide ntws los ntawm lub flash evaporator mus rau hauv lub tank cia; Tom qab ntawd nws tau muab tso rau hauv lub tank nyiaj siv ua haujlwm, dhau los ntawm cov kab sib pauv hloov pauv, thiab thaum kawg tau coj mus rau hauv lub tank cia los npaj cov tshuaj monomer nrog cov concentration ntawm 7-8%. Cov tshuaj no yog tom qab ntawd muab tso rau hauv lub thawv polymerization los tsim cov khoom lag luam colloidal polyacrylamide, ua rau cov khoom tiav tiav.
Polyacrylamide feem ntau muaj nyob rau hauv ob hom: hmoov thiab colloid. Txij li thaum daim ntawv colloidal nyuaj rau kev thauj thiab tuav, hmoov polyacrylamide (PAM) tau txais txiaj ntsig zoo ntawm cov neeg siv hauv xyoo tas los no. Polymer dispersions-tshwj xeeb PAM emulsions- kuj tau txais kev pom zoo vim lawv cov dej solubility zoo heev. Polyacrylamide Specifications: Cov txheeb ze molecular hnyav yog ib qho ntawm cov kev qhia tseem ceeb uas siv los sib txawv ntawm ntau hom polyacrylamide. Siab-molecular- hnyav PAM feem ntau yog siv los ua flocculant; nruab nrab-molecular- hnyav PAM ua haujlwm tsuas yog ua kom qhuav-lub zog tus neeg sawv cev hauv papermaking; thiab qis-molecular- hnyav PAM ua haujlwm raws li cov khoom tawg.
Yuav Ua Li Cas Xaiv Cationic Flocculant?
Vim li cas xaiv hom ionic tshwj xeeb yog qhov tseem ceeb thaum siv cationic polyacrylamide los kho cov dej khib nyiab? Vim tias ntau lub tuam txhab kev lag luam tsim cov sludge thiab dej khib nyiab, thiab ntau hom dej khib nyiab yuav tsum tau xaiv cov hom tshwj xeeb ntawm cationic polyacrylamide. Yog li, dab tsi yuav tsum tau coj mus rau hauv tus account thaum xaiv qhov tsim nyog cationic polyacrylamide?
Ua ntej, nws yog ib qho tseem ceeb kom nkag siab txog qhov chaw, khoom, muaj pes tsawg leeg, thiab cov ntsiab lus ntawm cov sludge. Raws li lawv cov ntsiab lus tseem ceeb, sludge hom tuaj yeem faib dav rau hauv cov organic sludge thiab inorganic sludge. Feem ntau hais lus, cationic polyacrylamide yog ua hauj lwm rau kev kho cov organic sludge thiab sludge dewatering, whereas anionic polyacrylamide yog siv rau kev kho mob ntawm inorganic sludge. Cationic polyacrylamide tsis yooj yim siv nyob rau hauv ib puag ncig alkaline heev, thaum anionic polyacrylamide tsis haum rau siv nyob rau hauv ib puag ncig acidic heev. Feem ntau, qhov siab dua cov ntsiab lus ntawm cov sludge, qhov ntau npaum li cas ntawm polyacrylamide xav tau.
Xaiv lub Ionicity ntawm Cationic Polyacrylamide: Rau cov sludge tsim rau dewatering, me me - ntsuas qhov ntsuas yuav ua tau los soj ntsuam polyacrylamide flocculants nrog ntau qib ntawm ionicity, yog li txheeb xyuas cov khoom tsim nyog tshaj. Txoj hauv kev no tsis tsuas yog ua kom pom cov txiaj ntsig zoo ntawm flocculation tab sis kuj txo qis qhov xav tau ntawm cov tshuaj polyacrylamide, yog li txo tus nqi tag nrho ntawm cov tshuaj kho dej. Cov txheej txheem tseem ceeb rau kev xaiv qhov tsim nyog ionicity yog qhov ua rau floc loj thiab lub zog floc (tshwj xeeb, cov ntsiab lus dej ntawm floc).
Floc Loj: Yog tias cov flocs me dhau lawm, lawv qhov nrawm nrawm yuav raug cuam tshuam; Piv txwv li, yog hais tias cov flocs loj heev, lawv yuav nqus dej ntau dhau, ua rau tsis zoo permeability nyob rau hauv lub sludge matrix. Floc loj tuaj yeem tswj tau zoo los ntawm kev kho qhov hnyav molecular ntawm polyacrylamide.
Floc Strength: Flocs yuav tsum nyob ruaj khov thiab tiv thaiv kev tawg nyob rau hauv shear rog. Xaiv polyacrylamide nrog rau qib tsim nyog ntawm ionicity pab txhim kho floc zog.
Cia peb xav txog qee qhov kev lag luam tshwj xeeb ua piv txwv:
Coal ntxuav thiab xuab zeb ntxuav cov txheej txheem feem ntau kuj yooj yim, tso cai rau kev siv ncaj qha ntawm cationic polyacrylamide.
Kev kho dej khib nyiab hauv kev lag luam chemical.
Cov dej khib nyiab uas tsim los ntawm cov tshuaj dawb, dyeing, thiab papermaking industries yog qhov nyuaj tshwj xeeb los kho; yog li ntawd, qhov ntau npaum li cas ntawm cov tshuaj kho mob yuav tsum tau nce thiab tswj nyob rau theem tsim nyog.
Cov pa phem ntau hauv cov dej khib nyiab electroplating thiab cov dej khib nyiab dav dav feem ntau tsis tshaj cov qauv kev kho mob tsim rau cov dej phwj hauv tsev. Txoj kev kho rau cov dej phwj hauv tsev sib txawv, ib yam li cov flocculants tshwj xeeb ua haujlwm. Yog tias siv txoj kev kho biochemical, cationic polyacrylamide tsuas yog yuav tsum tau ua tus sludge dewatering tus neeg sawv cev.
Yog tias siv txoj kev kho mob physicochemical, polymeric aluminium chloride tuaj yeem muab ntxiv ua ntej, ua raws li anionic polyacrylamide.
Cationic polyacrylamide yog siv rau dewatering lub hom phiaj; qhov tshwj xeeb npaum li cas yuav tsum tau rau ntau hom dej khib nyiab yuav tsum tau txiav txim siab raws li qhov tshwj xeeb ntawm cov dej zoo.
