Hydroquinone

Hydroquinone Property

mp : 172-175 °C(lit.) bp : 285 °C(lit.) density : 1.32 vapor density : 3.81 (vs air) vapor pressure : 1 mm Hg ( 132 °C) Fp : 165 °C storage temp. : Refrigerator solubility : H2O: 50 mg/mL, clear Water Solubility : 70 g/L (20 ºC) Merck : 14,4808 BRN : 605970 Stability:: Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, oxygen, ferric salts. Light and air-sensitive. Discolours in air. CAS DataBase Reference: 123-31-9(CAS DataBase Reference) NIST Chemistry Reference: Hydroquinone(123-31-9) EPA Substance Registry System: 1,4-Benzenediol(123-31-9)

Safety

Hazard Codes : Xn,N Risk Statements : 22-40-41-43-50-68-R68-R50-R43-R41-R40-R22 Safety Statements : 26-36/37/39-61-S61-S36/37/39-S26 RIDADR : 2662 WGK Germany : 3 RTECS : MX3500000 HazardClass : 9 PackingGroup : III HS Code : 29072210 Hazardous Substances Data: 123-31-9(Hazardous Substances Data)

Hydroquinone Chemical Properties,Usage,Production

Chemical Properties white needle-like crystals or crystalline powder Usage K channel agonist, antihypertensive Usage Hydroquinone Usage reducing agent prevents polymerization of resin monomers lightens darkened skin, light sensitive Usage Use as photographic reducer and developer; as reagent in the determination of small quantities of phosphate; as antioxidant. Depigmentor General Description Light colored crystals or solutions. May irritate the skin, eyes and mucous membranes. Mildly toxic by ingestion or skin absorption. Air & Water Reactions Darkens on exposure to air and light. Miscible in water. Solutions become brown in air due to oxidation. Oxidation is very rapid in the presence of alkali. Reactivity Profile Hydroquinone is a slight explosion hazard when exposed to heat. Incompatible with strong oxidizing agents. Also incompatible with bases. Hydroquinone reacts with oxygen and sodium hydroxide. Reacts with ferric salts . Hot and/or concentrated NaOH can cause Hydroquinone to decompose exothermically at elevated temperature. (NFPA Pub. 491M, 1975, 385) Health Hazard Hydroquinone is very toxic; the probable oral lethal dose for humans is 50-500 mg/kg, or between 1 teaspoon and 1 ounce for a 150 lb. person. It is irritating but not corrosive. Fatal human doses have ranged from 5-12 grams, but 300-500 mg have been ingested daily for 3-5 months without ill effects. Death is apparently initiated by respiratory failure or anoxia. Fire Hazard Dust cloud may explode if ignited in an enclosed area. Hydroquinone can react with oxidizing materials and is rapidly oxidized in the presence of alkaline materials. Oxidizes in air.

Hydroquinone Preparation Products And Raw materials

Raw materials Oxalic acid ZINC Aniline sulfate Manganese dioxide Manganese Bisphenol A Aniline Pyrocatechol Iron 1,4-Benzoquinone Activated carbon Sulfuric acid Sodium metabisulfite

Preparation Products Chloral hydrate tert-Butylhydroquinone 2,5-Dimethoxy-4-chloroaniline ethyl 3,3-dimethylpent-4-en-1-oate Fluazifop-P-butyl Hydroxypropyl acrylate 1-(2,5-Dimethoxyphenyl)-2-oximino-1-propanone 7-HYDROXYISOFLAVONE 4-CHLORO-8-(TRIFLUOROMETHYL)QUINOLINE Butylated hydroxyanisole enbucrilate 2-AMINO-1-(2,5-DIMETHOXYPHENYL)-1-PROPANONE Pirenoxine X-PHOS 3-METHYL-2,5-DIHYDROTHIOPHENE-1,1-DIOXIDE 2-[N-(2-Cyanoethyl)-4-[(2,6-dichloro-4-nitrophenyl)azo]anilino]ethyl acetate ammonium manganous sulfate 1,2,4-Trimethoxybenzene Chloro(1,5-cyclooctadiene)iridium(I) dimer 3-SULFOLENE FLUAZIFOP-BUTYL 2-Hydroxyethyl methacrylate methyl(±)cis，trans-2，2-dimethyl-3-(2-methyl-1-propenyl cyclopropane carboxylate) N-NONYL ACRYLATE Fast Blue BB 2,3-DIMETHYL-1,3-BUTADIENE 2,5-Dihydroxybenzoic acid 4-[(6-Chloro-1,3-benzoxazol-2-yl)oxy]phenol 4-Phenoxyphenol 1,4-Dimethoxybenzene 1,4-Diacetoxybenzene 2-CHLOROPYRIMIDINE-4-CARBONITRILE 2,5-Dimethoxyaniline 2,5-Di-tert-butylhydroquinone Ethyl chrysanthemumate Quizalofop-p-ethyl 1,2-NAPHTHALIC ANHYDRIDE Allyl hexanoate (1,1-DIMETHYL-PROP-2-YNYL)-HYDRAZINE 4-Ethenylphenol acetate

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