PTFE Rhaub siv li cas hauv cov cua sov Bio-Diesel Reactors rau Transesterification?

Biodiesel yog tsim los ntawm reacting zaub roj los yog tsiaj rog nrog methanol nyob rau hauv lub xub ntiag ntawm ib tug muaj zog alkaline catalyst xws li poov tshuaj hydroxide. Cov tshuaj tiv thaiv sib tov yog rhuab kom ceev cov txheej txheem. Lub tshuab cua sov yuav tsum tiv thaiv cov corrosive sib xyaw ntawm cawv kub thiab caustic.

Transesterification Reactor Tsim
Biodiesel feem ntau npaj los ntawm transesterification hauv lub tank kub reactor nrog nplawm. Cov tshuaj tiv thaiv sib xyaw (triglycerides, methanol thiab catalyst xws li KOH lossis NaOH) yog khaws cia ntawm 60-70℃kom tau txais cov tshuaj tiv thaiv. Cov cua sov tuaj yeem muab los ntawm lub rhaub dej kub ncaj qha rau hauv cov tshuaj tiv thaiv sib xyaw lossis los ntawm cov khoom siv hluav taws xob sab nraud nrog lub voj voog rov ua dua. Cov tshuaj lom neeg ib puag ncig yog nruj heev rau cov hlau feem ntau: rhuab methanol tuaj yeem tshem tawm cov ntsiab lus alloying, thiab cov alkali muaj zog ua rau txhuas, zinc thiab txawm tias stainless hlau nyob rau lub sijhawm ntev.

Immersion cua sov yog dav siv rau me me mus rau nruab nrab loj biodiesel nroj tsuag, vim nws txoj kev yooj yim thiab pheej yig dua nqi peev. Lub tshuab cua sov uas tau xaiv yuav tsum tiv taus corrosion los ntawm methanolic KOH lossis NaOH, yuav tsum tsis txhob ua rau muaj kev cuam tshuam sab nraud thiab yuav tsum tau ua haujlwm nyob rau hauv lub xub ntiag ntawm cov roj viscosity siab -feedstock sib tov thaum lub sij hawm pib ntawm cua sov.

Vim li cas PTFE Cov Cua Sov tuaj yeem tiv taus qhov hnyav Transesterification Ib puag ncig
PTFE immersion heaters yog tshwj xeeb tshaj yog pab tau rau cua sov biodiesel reactors li PTFE yog resistant rau muaj zog alkalis (KOH thiab NaOH) thiab cawv (methanol) mus txog 110 degree. Cov khoom tsis corrode, qhov av los yog nplai txawm tias tom qab lub sij hawm raug rau cov tshuaj alkaline methanol. PTFE, tsis zoo li cov cua kub cua sov, xws li carbon steel lossis tooj liab, yuav tsis tso cov hlau ions uas catalyze saponification lossis tsim cov xab npum uas txwv biodiesel tawm los.

Hauv daim ntawv thov PTFE rhaub biodiesel reactor transesterification, qhov tsis yog -reactive nto kuj tiv thaiv cov catalyst los ntawm accumulating los yog degrading ntawm lub rhaub. Qhov no paub tseeb tias cov tshuaj tiv thaiv yuav tshwm sim yam tsis muaj qhov chaw kub kub hauv zos lossis tsis xav tau catalysis. Corrosion proof heater tso cai rau kev tsim khoom tas mus li thiab tsis muaj sijhawm rau kev tu lossis hloov cov khoom cua sov ua tsis tiav.

Ua cov khoom noj khov thiab tiv thaiv saponification
Kev sib xyaw ntawm cov roj los yog cov rog nrog methanol tuaj yeem ua kom khov ua ntej cov tshuaj tiv thaiv mus txog qhov kub thiab txias tshwj xeeb tshaj yog siv cov roj ua noj los yog cov tsiaj rog nrog cov qib siab saturation. Kev tsim lub cev ntawm PTFE lub tshuab cua sov yog tsim los ua kom lub cev muaj zog ntawm kev sib xyaw ua ke hauv cov kua dej khov, xws li hnyav- lub luag haujlwm sheaths thiab ntxiv dag zog mounting flanges. Qhov qis qis - kev sib txhuam PTFE nto kuj txo qis qhov ua raws li cov nplaum nplaum los ntawm cov khoom noj.

Txheej txheem tswv yim: txaus agitation yuav tsum tau khaws cia thaum lub sij hawm cua sov kom tsis txhob localized saponification ntawm lub rhaub nto. Kev sib xyaw tsis zoo tuaj yeem tsim cov ntsiab lus tseem ceeb hauv zos ntawm caustic catalyst nyob ib ncig ntawm lub tshuab cua sov uas tuaj yeem hnov ​​​​mob dawb fatty acids los tsim cov tshuaj ntxuav tes. Txawm hais tias PTFE nws tus kheej tsis catalyze saponification, xab npum khaubncaws sab nraud povtseg tuaj yeem ua rau cov tshuaj tiv thaiv dawb huv. Qhov kev pheej hmoo tuaj yeem zam tau los ntawm kev siv hom agitator kom raug (piv txwv li pitched- hniav turbine lossis thauj tog rau nkoj impeller) thiab tso lub tshuab cua sov sab nraum qhov chaw ruaj khov. Yog tias xab npum tsim- tshwm sim, qhov tsis yog - nplaum zoo ntawm PTFE ua rau nws yooj yim los ntxuav dua li ntawm cov hlau.

Kev ua tau zoo thiab kev txwv kev ua haujlwm
PTFE muaj kev tiv thaiv siab tiv thaiv poov tshuaj hydroxide thiab sodium hydroxide tov ntawm qhov kub txog li 110℃thiab methanol ntawm boiling point (65 degree). Txij li thaum transesterification ntawm biodiesel feem ntau ua tiav ntawm 60-70 degree, PTFE cov cua sov yog zoo nyob rau hauv lawv qhov kub thiab txias. Rau cov txheej txheem uas siv ethanol es tsis yog methanol (qhov kub ntawm qhov kub 78 degree) lossis cov uas xav tau qhov kub thiab txias (xws li . 80-90℃rau qee cov khoom noj khoom noj ua ntej-cov kauj ruam kho), PTFE tseem tsim nyog, tsuav yog qhov kub tsis tshaj 110℃.

Lwm qhov zoo dua hauv biodiesel ntau lawm yog tias PTFE cov cua sov muaj kev tiv thaiv rau galvanic corrosion (corrosion uas tuaj yeem tshwm sim thaum cov hlau sib txawv nyob hauv lub reactor, piv txwv li, lub nkoj stainless hlau nrog tooj liab cua sov coil). PTFE yog ib qho hluav taws xob rwb thaiv tsev, yog li tsis muaj khub galvanic tsim thiab hom tsis ua haujlwm raug tshem tawm tag nrho.

Kev khiav hauj lwm yam ntxwv PTFE Compatibility
1% w / w KOH hauv methanol (65oC) Zoo heev Sodium hydroxide hauv methanol (1% w / w, 70 degree)
Cov roj zaub / methanol ua ke, 60℃Zoo heev (tsis o)
Localized caustic + dawb fatty acids Zoo PTFE yog resistant, tab sis saponification tuaj yeem tshwm sim hauv cov kua ntau
Cov ntsiab lus
PTFE cov cua sov muaj qhov kav ntev, tsis tshua muaj kev saib xyuas cua sov rau cov tshuaj lom neeg hnyav ntawm biodiesel transesterification. Cov cua sov no tuaj yeem tiv taus kub methanolic KOH thiab NaOH cov kev daws teeb meem, tsis txhob tso cov hlau ions thiab tsis ua rau cov catalyst deterioration, yog li tswj xyuas cov xwm txheej zoo sib xws thiab cov khoom zoo. Kev tsim hluav taws xob txuas ntxiv yuav tsum tau ua kom ruaj khov, corrosion- cov cuab yeej tiv taus thiab PTFE immersion heaters yog mus txog rau txoj hauj lwm - txawm nyob rau hauv me me, nruab nrab thiab pilot scale biodiesel ua hauj lwm.