p-phenolsulfonic acid

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Structural formula
Structural formula of p-phenolsulfonic acid
General
Surname p -phenolsulfonic acid
other names
  • para -phenolsulfonic acid
  • 4-hydroxybenzenesulfonic acid
Molecular formula C 6 H 6 O 4 S
Brief description

colorless crystal needles or oily liquid with a yellowish to reddish color, with a phenol-like odor

External identifiers / databases
CAS number 98-67-9
EC number 202-691-6
ECHA InfoCard 100.002.447
PubChem 4765
Wikidata Q1534677
properties
Molar mass 174.18 g mol −1
Physical state

liquid

density

1.33 g cm −3 (65% solution in water; 20 ° C)

Melting point

contradicting information in the literature

pK s value

9.11 (25 ° C)

solubility

soluble in water

safety instructions
GHS labeling of hazardous substances

for the aqueous 65% solution

05 - Corrosive

danger

H and P phrases H: 314-290
P: 280-305 + 351 + 338-310
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

p -Phenolsulfonic acid , also 4-hydroxybenzenesulfonic acid , forms colorless crystal needles or an oily liquid yellowish to reddish in color, with a phenol-like odor. It is isomeric to o-phenolsulfonic acid (socolic acid) and m-phenolsulfonic acid .

presentation

p -Phenolsulfonsäure, by sulfonation of phenol with concentrated sulfuric acid are recovered, wherein a mixture of p -Phenolsulfonsäure and o -Phenolsulfonsäure formed. Another, more vigorous sulfonation of the phenol leads to phenol-2,4-disulfonic acid .

effect

p -phenolsulfonic acid has a denaturing effect on proteins . It acts as an irritant after ingestion or inhalation and on the skin and is toxic or corrosive to the eyes, skin and lungs. Eye protection and adequate ventilation must be provided when processing them.

use

Phenolsulfonic acids are used to manufacture dyes or detergents. In oral care, phenolsulfonic acid is used in a mixture with gualacolic acid to combat changes in the mucous membrane such as aphthae . The application for removing bacterial deposits and dental deposits is also described.

Individual evidence

  1. ↑ a b c d e f g entry to 4-hydroxybenzenesulfonic acid in the GESTIS database of IFA , retrieved on September 11, 2015(JavaScript required) .
  2. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Dissociation Constants of Organic Acids and Bases, pp. 8-45.
  3. ↑ European patent EP 1587477 B1 : Odorless formulation for the treatment of mucosal discontinuities , October 26, 2011.
  4. ↑ patent application Epien Medical Inc. (Engl.) , Accessed December 31, 2008.