Khoom npe: 4-Hydroxybenzaldehyde

p-Hydroxybenzaldehyde;

PHBA;

CAS TSIS TAU .: 123-08-0

Cov mis mos: C7H6O2

Lub cev nyhav: 122.1213

Cov Qauv Qauv:

Qhov ceev: 1.226g / cm3

Siv:Nws yog ib qho tseem ceeb zoo tshuaj lom neeg cov khoom lag luam thiab nruab nrab rau cov tshuaj lom neeg organic, nrog kev siv dav hauv kev lag luam tshuaj, aromatizer, tshuaj tua kab, electroplating thiab kua siv lead ua kev lag luam. Hauv kev lag luam kws tshuaj, nws tuaj yeem siv los ua ke nrog cov tshuaj nruab nrab ntawm sulfonamides xws li qhov dav-spectrum sterilization synergist TMP, ampicillin thiab semi-synthesized penicillin (qhov ncauj) ntxiv rau nruab nrab ntawm d - (-) - p-hydroxy phenyl picramate. Hauv kev lag luam aromatizer, nws yog tsuas yog siv hauv raspberry ketone, methyl vanillin, ethyl vanillin, anisic aldehyde thiab nitrile aromatizer. Hauv kev lag luam tshuaj tua kab, nws yog siv los ua hluavtaws tshiab-tshuaj tua kab, tshuaj tua kab, o-bromobenzonitrile thiab hydroxyl casoron. Hauv kev lag luam electroplating, nws tuaj yeem raug siv los ua cov tshiab-hom cyanogens-dawb electroplating brightener.

1.Muaj ntau cov txheej txheem rau cov p-hydroxybenzaldehyde. Tam sim no, kev lag luam ntau lawm suav nrog phenol, p-cresol, p-nitrotoluene thiab lwm yam ntaub ntawv raw.

2.Cov txheej txheem phenol tuaj yeem muab faib ua Reimer Tiemann cov tshuaj tiv thaiv, cov tshuaj tiv thaiv gattermann, phenol Trichloroacetaldehyde txoj kev, phenol glyoxylic acid txoj kev, phenol formaldehyde txoj kev, thiab lwm yam txheej txheem Phenol yog tus cwj pwm los ntawm kev nkag tau yooj yim rau cov ntaub ntawv nyoos, cov txheej txheem tsim khoom yooj yim, qis qis thiab siab nqi.
Cov txheej txheem ntawm p-nitrotoluene los ua p-hydroxybenzaldehyde suav nrog peb kauj ruam: oxidation-txo, diazotization thiab hydrolysis.

3.P-cresol catalytic oxidation cov txheej txheem yog ncaj qha rau oxidize p-cresol rau p-hydroxybenzaldehyde nrog cua lossis oxygen nyob hauv kev ua ntawm catalyst.

Cov txheej txheem tshwj xeeb ntws yog raws li hauv qab no: ntxiv p-cresol, sodium hydroxide thiab methanol rau hauv stainless hlau siab txog ntsha, do kom txog thaum nws yaj tag, ntxiv cobalt acetate los ntim cov reactor, nce qhov kub kom 55 ℃ thiab pib qhia cov pa oxygen, ua kom lub siab nyob rau hauv lub nkoj ntawm 1.5MPa thiab hnov ​​mob rau 8-10h, tswj hwm qhov pa oxygen txaus tus nqi nyob rau hauv cov txheej txheem cov tshuaj tiv thaiv, thiab nruab cov coil txias txias hauv lub nkoj, thaum qhov kub nce, lub tsho ntawm cov hlab yuav tau muab Cov dej txias tuaj yeem txuas nrog. Nyob rau lub sijhawm no, cov kauj pib sib txuas nrog cov dej txias, tswj nruj ntawm tag nrho cov pa, thiab ua kom qhov kub hauv kettle nyob rau ntawm 60℃Cov. Thaum kawg ntawm cov tshuaj tiv thaiv, cov khoom siv tau tso rau hauv thawj autoclave, cov kuab tshuaj methanol yog evaporated thiab rov ua dua, thiab hydrochloric acid ntxiv tom qab dej ntxiv rau salting tawm. Cov khoom ua kua-kua tau lim los ntawm lub centrifuge, thiab cov khoom tau txais tau ziab hauv lub tshuab nqus tsev kub ntawm thaum 60℃ rau 3-5h, tom qab ntawd p-hydroxybenzaldehyde nrog cov ntsiab lus ntau dua li 98% tuaj yeem tau txais.