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6192-52-5

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Identification

Name
p-Toluenesulfonic acid monohydrate
CAS
6192-52-5
Synonyms
4-METHYLBENZENESULFONIC ACID MONOHYDRATE
4-TOLUENESULFONIC ACID MONOHYDRATE
4-TOLUENESULPHONIC ACID
4-TOLUENESULPHONIC ACID MONOHYDRATE
METHYLBENZENESULFONIC ACID MONOHYDRATE
PARA TOLUENE SULFONIC ACID
P-TOLUENESULFONIC ACID
P-TOLUENESULFONIC ACID MONOHYDRATE
P-TOLUENESULPHONIC ACID MONOHYDRATE
PTSA
PTS-ACID MONOHYDRATE
PTX
TFF
TOLUENE-4-SULFONIC ACID
TOLUENE-4-SULFONIC ACID MONOHYDRATE
TOLUENE-4-SULPHONIC ACID
TOLUENESULFONIC ACID MONOHYDRATE
TOSIC ACID MONOHYDRATE
TOS-OH H2O
p-Toluenesulfonicacid,monohyd
EINECS(EC#)
203-180-0
Molecular Formula
C7H10O4S
MDL Number
MFCD00142137
Molecular Weight
190.22
MOL File
6192-52-5.mol

Chemical Properties

Appearance
White crystals
Melting point 
96-99 °C(lit.)

mp 
96-99 °C(lit.)

Boiling point 
140°C 20mm
bp 
140°C 20mm
density 
1,24 g/cm3
vapor density 
5.9 (vs air)

refractive index 
1,382-1,384
Fp 
180 °C
storage temp. 
Store at RT.
solubility 
H2O: 0.1 g/mL, clear

form 
Solid
Colour Index 
42655
color 
White to pink
Stability:
Stable. Incompatible with strong oxidizing agents, strong bases, most common metals. Protect from moisture.
PH
1 (650g/l, H2O, 20℃)(anhydrous substance)
Water Solubility 
soluble
Sensitive 
Hygroscopic
Merck 
14,9533
Detection Methods
T,MP
BRN 
3568023
InChIKey
KJIFKLIQANRMOU-UHFFFAOYSA-N
CAS DataBase Reference
6192-52-5(CAS DataBase Reference)
EPA Substance Registry System
Benzenesulfonic acid, 4-methyl-, monohydrate (6192-52-5)

Safety Data

Hazard Codes 
Xi
Risk Statements 
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S37:Wear suitable gloves .
RIDADR 
UN 2585 8/PG 3

WGK Germany 
-

RTECS 
XT6300000

3
Autoignition Temperature
600 °C
TSCA 
Yes
HazardClass 
8
PackingGroup 
III
HS Code 
29041000
Toxicity
LD50 orally in Rabbit: 2570 mg/kg

Raw materials And Preparation Products

Material Safety Data Sheet(MSDS)

Hazard Information

Chemical Properties
White crystals
Uses
Derivitizing agent.
Purification Methods
Purify the acid by precipitation from a saturated solution at 0o by introducing HCl gas. It can also be crystallised from conc HCl, then crystallised from dilute HCl (charcoal) to remove benzenesulfonic acid. It has been crystallised from EtOH/water. Dry it in a vacuum desiccator over solid KOH and CaCl2. p-Toluenesulfonic acid can be dehydrated by azeotropic distillation with *benzene or by heating at 100o for 4hours under water-pump vacuum. The anhydrous acid can be crystallised from *benzene, CHCl3, ethyl acetate, anhydrous MeOH, or from acetone by adding a large excess of *benzene. It can also be dried under vacuum at 50o. The S-benzylisothiuronium salt has m 182o (from aqueous EtOH). [Beilstein 11 IV 241.]

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