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4-Hydroxybenzoic acid

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4-Hydroxybenzoic acid Basic information
4-Hydroxybenzoic acid Chemical Properties
  • Melting point:213-217 °C(lit.)
  • Boiling point:213.5°C (rough estimate)
  • Density 1,46 g/cm3
  • FEMA 3986 | 4-HYDROXYBENZOIC ACID
  • refractive index 1.4600 (estimate)
  • Flash point:199 °C
  • storage temp. Refrigerator
  • solubility methanol: soluble5%, clear to slightly hazy, colorless to faintly yellow
  • pka4.48(at 19℃)
  • form Crystalline Powder
  • color White to ivory
  • PH3.3 (1g/l, H2O, 20℃)
  • Water Solubility 5 g/L (20 ºC)
  • JECFA Number957
  • Merck 14,4812
  • BRN 970950
  • InChIKeyFJKROLUGYXJWQN-UHFFFAOYSA-N
  • CAS DataBase Reference99-96-7(CAS DataBase Reference)
  • NIST Chemistry ReferenceBenzoic acid, 4-hydroxy-(99-96-7)
  • EPA Substance Registry Systemp-Hydroxybenzoic acid (99-96-7)
Safety Information
MSDS
4-Hydroxybenzoic acid Usage And Synthesis
  • Chemical PropertiesWHITE TO BEIGE CRYSTALLINE POWDER
  • Chemical Properties4-Hydroxybenzoic acid is an odorless white crystalline astringent powder. In pure form, it imparts a sweetish taste at first, which quickly becomes acrid and disagreeable
  • OccurrenceReportedly present in apple juice, black currant, cheese, beer, grape brandy, rum, sherry, wines, cocoa, peanut, soybean and wort.
  • Usesp-Hydroxybenzoic acid is of significant commercial importance. The most familiar application is the use of several of its esters as preservatives, known as parabens. Also of interest is the use in liquid crystal polymer applications.
  • UsesAcetylsalicylic Acid Impurity A
  • UsesIn organic. syntheses; intermediate for dyes, fungicides.
  • DefinitionChEBI: A monohydroxybenzoic acid that is benzoic acid carrying a hydroxy substituent at C-4 of the benzene ring.
  • PreparationPrepared from p-bromophenol or p-hydroxybenzaldehyde, or from saponification of methyl salicylate, a major component of oil of wintergreen.
  • Aroma threshold valuesDetection at 5 ppm (water)
  • Purification MethodsCrystallise the hydroxyacid from water. [Beilstein 10 IV 345.]
4-Hydroxybenzoic acid Preparation Products And Raw materials
4-Hydroxybenzoic acid(99-96-7)Related Product Information
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