urea yog dab tsi thiab keeb kwm ntawm nws keeb kwm yog dab tsi? Vim li cas thiaj hu tias, siv qhov twg? Wb sim saib seb.
Keeb kwm ntawm kev tshawb pom ntawm urea
Nws hloov tawm tias nws muaj feem cuam tshuam ncaj qha rau cov zis. Xyoo 1773, tus kws tshuaj Fab Kis Fab Kis Hilaire Marin Ruel cais nws los ntawm tib neeg cov zis. Tom qab ntawd, xyoo 1828, German chemist thiab tus kws kho mob Friedrich Wöhler, los ntawm evaporating ammonium cyanate (NH 4 CNO) yaj hauv dej, tau txais cov organic compound los ntawm cov tshuaj inorganic, zoo ib yam li nws cov yam ntxwv. urea. Nws yog los ntawm qhov xwm txheej no uas keeb kwm ntawm cov organic chemistry pib, txij li thawj zaug cov organic compound tau txais cov khoom siv hluavtaws. Tsis yog txhua yam khoom ntawm kev tshawb fawb tshawb fawb tuaj yeem khav tau tias kev tshawb fawb tshiab tau tshwm sim nrog nws qhov kev tshawb pom.
urea yog dab tsi thiab nws tuaj qhov twg
Thiab tseem, urea - nws yog dab tsi? Qhov no yog cov tshuaj sib xyaw uas muaj cov qauv tsim thiab yog tawg ntawm cov dawb los yog xim me ntsis tsw ntxhiab crystalline granules. Cov mis rau urea yog NH2CONH2. Lwm lub npe yog urea. Cov khoom yog heev soluble nyob rau hauv dej. Qhov tshwm sim ntawm kev sib xyaw ntawm carbamide nrog cov ntxhia hauv cov kua qaub heev yog cov ntsev. Thaum nug sebDab tsi yog urea, los ntawm qhov pom ntawm lub cev ntawm lub cev, nws tuaj yeem teb tau tias nws yog qhov kawg ntawm cov khoom noj protein hauv cov tsiaj thiab ntses. Lub biochemical muaj pes tsawg leeg ntawm cov ntshav yuav tsum muaj urea. Qhov siab tshaj plaws ntawm urea hauv cov ntshav ntawm cov menyuam yaus hnub nyoog qis dua 14 xyoos yog 6.4 mmol / l, nrog rau hnub nyoog, cov ntsiab lus ntawm urea hauv cov ntshav nce mus rau 7.5 mmol / l.
Urea yog tau txais kev lag luam los ntawm kev sib txuas ntawm carbon dioxide thiab ammonia los ntawm cov tshuaj tiv thaiv Bazarov. Vim li no, kev tsim cov urea ua ke nrog kev tsim cov khoom lag luam raws li ammonia.
Vim li cas peb thiaj xav tau urea
Thiab urea yog dab tsi hauv kev lag luam? Vim li cas nws yog synthesized? Hauv kev tsim cov resins, adhesives siv nyob rau hauv zus tau tej cov fiberboard thiab nyob rau hauv cov rooj tog ntau lawm, urea qib A yog siv. Nyob rau tib lub sijhawm, cov tshuaj paraffin yog tso tawm, uas tsim nyog rau kev tsim cov protein thiab vitamin khoom, fatty acids thiab cawv, thiab ntau yam tshuaj ntxuav tes.
Lwm thaj chaw ntawm kev thov ntawm urea yog kev ua kom huv ntawm nitrogen oxides los ntawm cov pa luam yeeb tawm ntawm thermal fais fab nroj tsuag, cov nroj tsuag pov tseg, boiler tsev, thiab lwm yam.
Urea hauv kev kho mob yog dab tsi?
Y Urea yog ib qho ua haujlwm qis osmotic diuretic. Nws yog cov khoom siv raw rau kev tsim cov tshuaj uas tshem tawm cov dej los ntawm tib neeg lub cev (cov tshuaj ua kom lub cev qhuav dej). Cov tshuaj no yog qhov tseem ceeb hauv kev kho mobhydrocephalus, cerebral edema ntawm ntau yam etiologies. Tsis tas li ntawd, carbamide yog siv los ua tshuaj tsaug zog.
Urea tsis nco nws lub sijhawm los koom nrog kev lag luam khoom noj. Khoom noj khoom haus ntxiv E927b tsis muaj dab tsi tab sis urea. Nws muaj foaming zog, ua raws li ib tug tsw thiab aroma enhancer ntawm cov khoom noj. Nws yog siv hauv kev tsim cov pos hniav, txhawm rau txhim kho cov hmoov nplej thiab cov khoom noj khoom haus zoo. Thaum ntxiv rau cov poov xab ua khob noom cookie, urea ua raws li cov khoom nruab nrab thiab cov khoom siv nitrogen rau cov kab mob poov xab.
Tab sis qhov tseem ceeb ntawm urea uas tsim nyob rau hauv peb lub teb chaws (kwv yees li 4 lab tons hauv ib xyoos yog tsim txhua xyoo) mus rau qhov kev xav tau ntawm kev ua liaj ua teb. Cov urea chiv ua los ntawm qib B urea yog ib qho khoom muaj nqis ntawm nitrogen, vim nws muaj me ntsis ntau dua 46%. Txawm tias muaj tseeb hais tias urea yog soluble nyob rau hauv dej, nws nws tus kheej absorbs dej heev reluctantly. Qhov zoo feature no tseem ceeb heev thiab tso cai rau koj mus sau chiv nyob rau hauv loj ntim, tsis txhob ntshai tias cov stocks clog thiab tig mus rau hauv pob zeb thaum lub sij hawm cia. Carbamide muaj cov tshuaj lom neeg ua haujlwm siab thiab yooj yim nqus los ntawm cov nroj tsuag. Yeej, urea yog siv nyob rau theem ntawm pre-sowing kev kho mob, txheej ntsuab loj los ntawm cov nroj tsuag.
