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HomeProduct name listPeri acid

Peri acid

  • CAS NO.:82-75-7
  • Empirical Formula: C10H9NO3S
  • Molecular Weight: 223.25
  • MDL number: MFCD00035730
  • EINECS: 201-437-1
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-11-19 23:02:33
Peri acid Structural

What is Peri acid?

Chemical properties

Dark green powder. 1-Aminonaphthalene-8-sulfonic acid [82- 75-7]. (8-aminonaphthalene-1-sulfonic acid), Peri acid, C10H9NO3S, Mr 223.24, crystallizes as the monohydrate and is sparingly soluble even in boiling water. The sodium salt is also sparingly soluble in water. Caustic fusion at 200℃ produces 8-amino-1- naphthol, whereas slow hydrolysis with 10 % sodium hydroxide at 220 – 260℃ yields 1,8- dihydroxynaphthalene. Sulfonation with cold 10 % oleum produces 1-aminonaphthalene-4,8- disulfonic acid, whereas hot concentrated sulfuric acid results in slow isomerization into naphthionic acid.

The Uses of Peri acid

Intermediate of dyestuff

Production Methods

Naphthalene is converted to naphthalene-1-sulfonic acid. The crude sulfonation product is diluted with sulfuric acid, and 67.5 % nitric acid is added slowly at 30℃ to give the 5- and 8-nitro derivatives. The products are converted to the readily soluble magnesium salts by addition of a slurry of dolomite. The reaction mixture is neutralized with chalk and filtered hot. The filtrate is run into a suspension of iron powder in boiling water, which is kept slightly acidic with sulfuric acid. When reduction is complete, dissolved iron is precipitated by addition of magnesia, the iron residues are filtered off while hot, and the resulting liquor is acidified to pH 4.5 with sulfuric acid to give 99 % pure Peri acid in 48 % yield. The filtrates are further acidified to precipitate crude Laurent’s acid. This may be purified via its magnesium salt to give a 17 % yield of pure 1,5-isomer.

Properties of Peri acid

Melting point: >350°C
Boiling point: 220°C (rough estimate)
Density  1.3588 (rough estimate)
refractive index  1.6500 (estimate)
pka pK1: 5.03 (25°C)
form  powder to crystal
color  Light yellow to Brown
Water Solubility  0.2g/L(21 ºC)
Merck  14,6405
BRN  983230
CAS DataBase Reference 82-75-7(CAS DataBase Reference)
EPA Substance Registry System 1-Naphthalenesulfonic acid, 8-amino- (82-75-7)

Safety information for Peri acid

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P264:Wash hands thoroughly after handling.
P264:Wash skin thouroughly after handling.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405:Store locked up.

Computed Descriptors for Peri acid

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