YEthanol vs Biodiesel
Kev kub ntxhov hluav taws xob yog qhov teeb meem loj hauv ntiaj teb tam sim no. Yog li ntawd, kev tsim hluav taws xob tau yog lub ntsiab lus feem ntau tau tham tsis ntev los no. Cov khoom siv hluav taws xob tuaj yeem muab faib ua ob hom raws li cov khoom siv hluav taws xob tauj dua tshiab thiab tsis siv hluav taws xob txuas ntxiv. Cov khoom siv hluav taws xob tauj dua tshiab tau ntxiv tsis tu ncua, thiab lawv yog ntuj. Piv txwv li, cua, dej, hnub ci thiab tides yog ib co ntawm lub zog tauj dua tshiab. Cov khoom siv hluav taws xob tsis tuaj yeem siv tau tsuas yog nyob rau ib lub sijhawm, thiab lawv tsis tuaj yeem rov tsim dua tshiab thaum lawv ploj mus. Coal thiab roj av (fossil fuels) yog qhov tsis muaj zog dua tshiab. Cov no siv ntau lab xyoo los tsim, thiab thaum lawv siv, lawv tsis tuaj yeem rov tsim dua tshiab. Cov kws tshawb fawb tab tom nrhiav rau ntau qhov chaw siv hluav taws xob, uas tuaj yeem siv los hloov cov khoom siv hluav taws xob tsis muaj zog ntxiv uas peb muaj. Lwm yam tshaj li lub zog tsim tawm los ntawm txhua qhov chaw, hnub no qhov tseem ceeb yog muab rau cov peev txheej, uas ua rau muaj kev puas tsuaj rau ib puag ncig yam tsawg kawg nkaus.
Ethanol Nyob
Ethanol yog ib qho cawv yooj yim nrog cov mis molecular ntawm C2H5OH. Nws yog cov kua ntshiab, tsis muaj xim, nrog cov yam ntxwv tsw. Tsis tas li ntawd, ethanol yog cov kua ua kua. Melting point ntawm ethanol yog -114.1 o C, thiab kub taw tes yog 78.5 o C. Ethanol yog polar vim qhov sib txawv ntawm electronegativity ntawm oxygen thiab hydrogen hauv pawg -OH. Tsis tas li ntawd, vim yog pawg -OH, nws muaj peev xwm tsim hydrogen bonds.
Ethanol yog siv los ua dej haus. Ethanol tuaj yeem yooj yim tau los ntawm cov txheej txheem qab zib fermentation siv zymase enzyme. Cov enzyme no tshwm sim hauv cov poov xab, yog li hauv kev ua pa anaerobic, poov xab tuaj yeem tsim ethanol. Lwm yam tshaj li dej haus, ethanol tuaj yeem siv los ua cov tshuaj tua kab mob los ntxuav cov kab mob ntawm cov kab mob. Ethanol yog miscible nrog dej, thiab nws ua hauj lwm raws li cov kuab tshuaj zoo. Tsis tas li ntawd, nws feem ntau yog siv los ua roj thiab roj ntxiv hauv tsheb. Ethanol yog cov roj txuas ntxiv ua los ntawm cov nroj tsuag. Nws tsis muaj teeb meem emissions tom qab hlawv, zoo li roj av. Tsis tas li ntawd nws yog biodegradable; Yog li ntawd, ethanol yog ib puag ncig kev nyab xeeb roj lwm txoj kev. Tsis tas li ntawd, ethanol tuaj yeem siv tau yooj yim hauv cov roj cav tsis muaj kev hloov pauv ntau.
Biodiesel
Biodiesel yog roj, uas tuaj yeem siv los hloov roj av. Qhov no yog tsim los ntawm cov khoom siv txuas ntxiv. Biodiesel yog tsim los ntawm cov roj zaub lossis tsiaj rog los ntawm cov txheej txheem tshuaj hu ua transesterification. Biodiesel muaj mono-alkyl esters ntawm cov saw ntev fatty acids. Yog li ntawd, lub transesterification muab cov esters li cov khoom biodiesel thiab glycerin raws li cov khoom lag luam. Cov biodiesel no hu ua ntshiab biodiesel. Biodiesel kuj tuaj yeem sib xyaw nrog roj av thiab tuaj yeem tsim biodiesel sib xyaw. Qhov no tuaj yeem siv tau yooj yim hauv cov cav diesel. Txij li cov khoom siv raw rau kev tsim biodiesel yog hauv tsev, cov txheej txheem tsim khoom ua rau muaj kev phom sij tsawg rau ib puag ncig. Biodiesel nws tus kheej yog ib puag ncig tus phooj ywg, vim nws hlawv huv si (emit tsawg npaum li cas ntawm cov pa phem thaum hlawv piv rau roj av). Nws yog dawb los ntawm sulfur los yog aromatic compounds, uas ua rau muaj teeb meem kev noj qab haus huv rau tib neeg. Ntxiv mus, biodiesel yooj yim siv, biodegradable, thiab nontoxic.
Qhov txawv ntawm Ethanol thiab Biodiesel yog dab tsi?
• Ethanol belongs rau pawg cawv thiab biodiesel feem ntau belongs rau pawg ester.
• Biodiesel ua rau muaj kev puas tsuaj rau ib puag ncig tsawg dua li ethanol.
• Biodiesel zog ntau dua piv rau cov ethanol.
