naphthalene-1-sulfonic acid naphthalene-1-sulfonic acid

structural formula

• numbering system
• physical property data
• toxicological data
• ecological data
• molecular structure data
• computing chemical data
• more
  • properties and stability
  • storage method
  • synthesis method
  • purpose

numbering system

cas number:85-47-2

mdl number:mfcd00003987

einecs number:201-610-1

rtecs number:none

brn number:none

pubchem number:24851215

physical property data

1. characteristics: prismatic white crystals, recrystallized from dilute hydrochloric acid containing 2molecular crystal water

2. density (g/ml ,25/4℃): undetermined

3. relative vapor density (g/ml, air=1): undetermined

4. melting point (ºc):90 ℃ (hydrate),139-140 ℃ (anhydrous).

5. boiling point (ºc,normal pressure): undetermined

6. boiling point (ºc,5.2 kpa): undetermined

7. refractive index: undetermined

8. flash point (ºc): undetermined

9. specific optical rotation (º ): undetermined

10. autoignition point or ignition temperature (ºc): undetermined

11. vapor pressure (kpa, 25ºc): undetermined

12.

synthesis method

obtained from the sulfonation of naphthalene with chlorosulfonic acid. the sulfonation reaction uses o-nitroethylbenzene as the solvent, and the molar ratio of naphthalene, chlorosulfonic acid and o-nitroethylbenzene1：1.1：3match, in0-5℃carry out sulfonation reaction, and the purity is97%of1-naphthalenesulfonic acid. if using98% sulfuric acid is used as the sulfonating agent, and the reaction temperature is 0-40℃, the obtained sulfonate contains 1 –naphthalenesulfonic acid83 -85%,2 –naphthalenesulfonic acid15 -17%, adding magnesium salt or sodium salt can separate the precipitated2-filter out the magnesium salt or sodium salt of naphthalenesulfonic acid. contains free1-naphthalene the filtrate of sulfonic acid is concentrated, cooled, crystallized, filtered, washed and dried to obtain the finished product.

purpose

used for manufacturing1-naphthol , 1-naphthol sulfonic acid, 1- naphthylamine sulfonic acid and other intermediates.

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