Tamil Nadu Petro Products Limited is a leading manufacturer of industrial chemicals including caustic soda. Caustic soda is a large inorganic chemical used to make soaps, detergents, textiles, and other commodities. It is produced through an electrolysis process involving brine purification and chlorate decomposition followed by caustic concentration.

1. MANUFACTURE OF CAUSTIC SODA
PRESENTED BY
ASFAR NISHA P
810020239007
GUIDE
Dr. E. GOMATHI, M.Tech., Ph.D.,

2. Company Profile
Tamil Nadu Petro Products Limited (TPL) is a leading
manufacturer of Industrial Intermediate chemicals with its headquarters
in Chennai, India.
TPL was established in 1984 with the founding objective of
setting up a state of that art Linear Alkyl Benzene (LAB) manufacturing
facility. Today, the company’s portfolio of products also includes caustic
soda, propylene oxide and chlorine.

3. About Caustic Soda
 Caustic Soda [NaOH] is the large inorganic chemical on
which depends the development of a number of chemical
industries like rayon, drugs, pulp and paper etc. It is used
in the manufacture of day to day commodities like soaps,
detergents and textiles.
 In India commercial production of caustic soda was started
in 1941 with the commissioning of two, 5 TPD plants, one
at Kolkata and other at Mettur Dam.

4. Physical and Chemical Properties of
Caustic Soda
S. NO Parameter Values
1 Molecular formula NaOH
2 Molecular Weight 38
3 Solubility in water 418 g/I (10 ̊C)
4 Appearance White, waxy, opaque crystal
5 Odor Odorless
6 Density 2.13 g/cmᶟ
7 Melting point 318 ̊ C
8 Boiling point 1388 ̊C
9 Solubility in methanol 238 g/I
10 Vapour pressure <2.4 kpa (at 20 ̊C)
11 pH 13
12 Refractive index (nD) 1.3576

5. Process Description
 Primary brine purification
 Secondary brine purification
 Electrolysis
 Brine De chlorination and chlorate decomposition
 Caustic Concentration

6. Process Flow Diagram