P-toluene sulfonic acid (chemical formula :p-CH3C6H4SO3H, also written TsOH) is a non-oxidizing organic acid that is one million times more acidic than benzoic acid. White needle or powder crystal, easily deliquescent, soluble in water, alcohol and other polar solvents. Will make paper, wood and other dehydration occurs carbonization. The most common is p-toluenesulfonic acid monohydrate TsOH·H2O.
Basic information
Chinese name: p-toluene sulfonic acid
English name :p-Toluenesulfonic Acid
Chinese alias: p-methylbenzene sulfonic acid; 4-toluene sulfonic acid; 4-methylbenzene sulfonic acid
English alias :Methylbenzenesulfonic acid; Toluenesulfonic acid; Tosic acid; P-Toluene Sulfonic Acid; P-Toluene Sulphonic Acid; para toluene sulfonic acid; para toluene sulphonic acid; PARATOLUENE SULPHONIC ACID; PTS ACID; 4-methylbenzenesulfonic acid
CAS number :104-15-4
Molecular formula :C7H8O3S
Molecular weight :172.2016
SMILES: Cc1ccc(cc1)S(=O)(=O)O[1]
Collapse and edit this section of physical data
1. Properties: colorless monoclinic flake or column acetic acid odor crystal
2. Density (g/mL,20ºC) : 1.07
3. Relative vapor density (g/mL, air =1) : not determined
4. Melting point (ºC) : 106-107
5. Boiling point (ºC, atmospheric pressure) : 116
6. Boiling point (ºC,50mmHg) : not determined
7. Refractive index (n20/D) : 1.3825-1.3845
8. Flash point (ºC) : 41
9. Specific rotation (º) : not determined
10. Spontaneous ignition point or ignition temperature (ºC) : not determined
11. Vapor pressure (mmHg,20ºC) : 14
12. Saturated vapor pressure (kPa,25ºC) : not determined
13. Heat of combustion (KJ/mol) : not determined
14. Critical temperature (ºC) : not determined
15. Critical pressure (KPa) : not determined
16. Value of oil-water (octanol/water) distribution coefficient: not determined
17. Upper explosion limit (%,V/V) : not determined
18. Lower explosive limit (%,V/V) : not determined
19. Solubility: soluble in ethanol and ether, slightly soluble in water and hot benzene
Collapse edit this section storage method
Store in a cool, dry place, away from fire.
Store in a cool, ventilated and dry place in plastic bags and wooden cases. Store and transport in accordance with toxic chemicals regulations.
Collapse edit this paragraph synthesis method
It is obtained by hydrolysis of p-toluenesulfonyl chloride. Toluene can also be used as raw material and obtained by sulphonation with sulfuric acid.
Collapsible edit the main purpose of this paragraph
Used as a chemical reagent, also used in dyes, organic synthesis. Used as an intermediate in medicine (such as doxycycline), pesticides (such as dicofol), dyes, etc. Also used in detergents, plastics, coatings and other aspects.
Collapse and edit this safety information
Folding risk terms
R10:Flammable. R10:Flammable.
R34:Causes burns. R34:Causes burns.
Folding safety terms
S23:Do not breathe vapour. S23:Do not breathe vapour.
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) Seek medical advice immediately (show the label whenever possible.)
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