Product Identification

Product Name

4-Methylbenzenesulfonic acid

Synonyms

4-Methylbenzenesulfonic acid
Cyzac 4040
Nacure 1040
p-Methylphenylsulfonic acid
p-Toluenesulfonic acid
Toluene-4-sulfonic acid

CAS

104-15-4

Formula

C7H8O3S

Molecular Weight

172.2

EINECS

203-180-0

RTECS

XT6300000

RTECS Class

Other

Merck

12,9671

Beilstein/Gmelin

472690

Beilstein Reference

4-11-00-00241

EC Index Number

016-030-00-2

EC Class

Irritant

Physical and Chemical Properties

Appearance

Monoclinic leaflets or prisms.

Solubility in water

Very soluble

Melting Point

106-107

Boiling Point

332

Density

1.24 g/cm3 (20 C)

Partition Coefficient

.93

Heat Of Vaporization

Heat Of Combustion

-3530 kJ/mol

Usage

Used as reagent in kirsten modification of kleber method (for lemon oil).

First Aid Measures

Ingestion

Seek medical assistance.

Inhalation

Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.

Skin

Wash the exposed area with copious amounts of water. A physician should examine the area if irritation or pain persists.

Eyes

Exposed eyes should be irrigated with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility. Irrigation: in a medical facility, irrigate with sterile saline for at least an hour.

Handling and Storage

Storage

Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.

Handling

All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.

Hazards Identification

Inhalation

Inhalation may produce dyspnea, pleuritic chest pain, upper airway edema, pulmonary edema, hypoxemia, bronchospasm, pneumonitis, and persistent pulmonary function abnormalities. Airway hyperreactivity has also been reported.

Skin

Contact with molten substance may cause severe burns to skin and eyes. See Inhalation.

Eyes

See Inhalation.

Ingestion

Ingestion of acids may result in burns, gastrointestinal bleeding, gastritis, perforations, dilation, edema, necrosis, vomiting, stenosis, fistula, and duodenal/jejunal injury.

Hazards

When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.

UN (DOT)

2585

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate protective gloves, clothing and goggles.

Respirators

Wear positive pressure self-contained breathing apparatus (SCBA).

Exposure Effects

Abnormal neuropsychologic function has been reported following hydrochloric acid exposure from a leaking tanker truck.

Exposure limit(s)

OEL-UNITED KINGDOM:TWA 10 ppm (25 mg/m3);STEL 15 ppm (35 mg/m3)

Poison Class

3

Fire Fighting Measures

Flash Point

184

Fire Fighting

Small Fires: Dry chemical, carbon dioxide or water spray. Large Fires: Dry chemical, carbon dioxide, alcohol-resistant foam or water spray.

Fire Potential

Ignites after considerable preheating.

Accidental Release Measures

Small spills/leaks

ELIMINATE all ignition sources. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.

Stability and Reactivity

Stability

Normally stable; unstable at high temperature and pressure.

Incompatibilities

Reacts with water. A strong acid which can react with common metals. Explosions can occur when using an analytical method involving sequential addition if acetic acid, aqueous p-toluenesulfonic acid and acetic anhydride to serum.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2585

Hazard Class

8

Packing Group

III