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Caustic Soda, Chlorine and Hydrogen

At DCM Shriram, we manufacture products that contribute to the competitiveness of India's industrial economy. This includes Caustic Soda, Chlorine and Hydrogen that are produced at our integrated Kota Plant in Rajasthan and Bharuch Plant in Gujarat. We have a combined Chlor Alkali production capacity of 4.5 Lakh TPA, and are in the process of substantial expansion.

Caustic Soda is a basic product very widely used in diverse industrial sectors, either as a raw material or as an auxiliary chemical. It is mainly used in the manufacture of pulp and paper, newsprint, viscose yarn, staple fiber, Aluminium, cotton, textiles, toilet and laundry soaps, detergents, dyestuffs, drugs and pharmaceuticals, vanaspati and  petroleum refining. Caustic soda is produced in two forms - lye and solids. Solids can be in the form of flakes or granules.

Three technologies are available world over for production of caustic soda – mercury cell process, diaphragm process, and membrane cell process. All three processes are in use in India, although there is strong trend indicating a shift towards the environmentally better membrane cell process. We manufacture Caustic soda through more environmentally friendly membrane technology.

Chlorine is co-produced with caustic soda in the electrolysis of brine. For every ton of caustic soda produced, 0.886 tons of chlorine is also produced. Being a gas and also due to its hazardous nature it cannot be transported over long distances. Generally chlorine is liquefied and transferred into 0.9 metric ton cylinders (called tonners) which are then transported over a limited geographical radius.

Chlorine gas cannot be produced commercially without producing caustic soda, so chlorine and caustic soda are known as "co-products," and their economics are inextricably linked