p-Toluene Sulphonic Acid
Time: 2012-09-28 16:32:57

p-Toluene Sulphonic Acid

Synonyms

4-methylbenzenesulfonic acid;

p-Toluenesulfonic acid;

Toluene-4-sulphonic acid;

Tosic Acid;

PTSA;

Category

Anionic Surfactant

> Sulfonate

>> Aryl Sulfonate

>>> Phenyl Sulfonate

>>>> Linear Alkylphenyl Sulfonate

Chemical Numbering System

CASRN104-15-4

EINECS203-180-0

Molecular Formula & Molecular Weight

Molecular Formula: C7H8O3S

Molecular Weight: 172.20

Structure

Properties

Appearance    (1), white crystal; (2), liquid.

Solubility    soluble in water; soluble in alcohol.

Hygroscopicity    hygroscopic.

Physical - chemical properties

Water solubility, g/L Water

About 670 (Not specified temperature)[1]

Melting point, °C

106 - 107[1]

Stability    stable.

Risk    Solid form: flammable material; corrosion; irritation, moderate irritation to skin, eye. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.

GHS (Rev.7) label:   

Liquid form: corrosion; irritation, moderate irritation to skin, eye.

GHS (Rev.7) label:  

Animal Toxicity

Table 1 Animal toxicity values

rat oral LD50

2480mg/kg[2]

quail oral LD50

> 316mg/kg[2]

rat oral LD50

400mg/kg[1]

rat intravenous LD50

70mg/kg[1]

mouse intravenous LD50

160mg/kg[1]

Ecology    may be hazardous to environment. Water body should be given special attention.

Biodegradability    biodegradable.

Characteristics    excellent hydrotropic, viscosity reducing, pour point depressing, anti-caking, dispersing, emulsifying, cleansing abilities. Commonly use as acidic catalyst in organic synthesis. Non-oxidizing organic strong acid. Paper and wood can be carbonized.

Synthesis

Currently, sulfonation reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfonates.

Generally, p-toluene and sulfur trioxide react through reactor, finally obtain product.

US patent 8,921,588 (Process for preparing sulfates and/or sulfonates in a micro-reaction system) presents a synthetic process. Conditions: mole ratio of sulfur trioxide and alkyl benzenes or other raw materials: 1:1; temperature: 30-60°C; reactor: falling film reactor.

Quality Standards & Test Methods

1, Physical and chemical indexes

Item

Physical and chemical indexes

Liquid

Solid

Actives, %, ≥

30.0 - 80.0

98.0

pH (25°C, 1%), <

3.0

3.0

Test Methods

(1), Actives

GB/T 5173 Surface active agents and detergents-Determination of anionic-active matter by direct two-phase titration procedure

ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure

(2), pH

GB/T 6368 Surface active agents - Determination of pH of aqueous solution - Potentiometric method

ISO 4316 Surface active agents -- Determination of pH of aqueous solutions -- Potentiometric method

2, Hazardous substances indexes

Item

Hazardous substances indexes

Liquid

Solid

Heavy metals (as Pb), mg/Kg, ≤

20

20

As, mg/Kg, ≤

3

3

Test Methods

(1), Heavy metals (as Pb)

Safety and Technical Standards for Cosmetics (2015 Edition)

GB/T 30799 The test method of food detergents - Determination of heavy metals

(2), As

Safety and Technical Standards for Cosmetics (2015 Edition)

GB/T 30797 The test method of food detergents - Determination of total arsenic

3, Further explanation

(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.

(b), Used in cosmetics, should be test for harmful substances; or furtherly test for microorganisms.

Major Uses

1, Typical applications

Use as hydrotrope.

Use as auxilialy emulsifying agent, auxilialy dispersing agent.

Use as cleansing agent, pickling agent.

Prepare alkali metal salt or amine salt of p-toluenesulfonic acid.

2, Household detergents

Use as hydrotrope, cleansing agent.

3, Industrial cleaning agents

Use as hydrotrope, cleansing agent.

4, Personal care products

Use as hydrotrope.

5, Pets

Use as hydrotrope.

6, Organic Synthesis

Use as acidic catalyst.

Manufacturers

 

References

[1]: HSDB. 104-15-4, p-Toluenesulfonic acid

[2]: ChemIDplus. 104-15-4, p-Toluenesulfonic acid

Update: 20131025(1); 20170310(2);