Soda ash in Gujarat is made by the ammonia-soda process, also called the Solvay process, using salt and limestone as raw materials. The state has both close at hand, which is why most of India's soda ash capacity sits along its coast.
Production is concentrated in a small number of large plants. That shapes how you find and buy from a producer, especially for smaller volumes.
The process in brief
The ammonia-soda process runs in a few linked steps. Each one recycles material from the others:
- Salt is dissolved to make a purified brine, and limestone is burned in kilns to give lime and carbon dioxide.
- The brine absorbs ammonia, then carbon dioxide is bubbled through it in carbonating towers.
- Sodium bicarbonate crystallises out, and is filtered and washed.
- The bicarbonate is heated in calciners, which gives light soda ash and releases carbon dioxide for reuse.
- Lime is used to recover ammonia from the remaining liquor, leaving calcium chloride as the main by-product.
- Some light ash is converted to dense ash by adding water and recrystallising it as a monohydrate, then drying it.
Energy and waste
The process needs large amounts of energy and water, and disposing of the calcium chloride waste is a known environmental issue for plants of this type. Our article on light and dense soda ash explains how the two grades differ in use.
Why Gujarat
Soda ash plants need a lot of salt, a lot of limestone, and a port. Gujarat has solar salt in Kutch and along the Saurashtra coast, limestone deposits in Saurashtra, and ports at Pipavav, Mundra and Deendayal (Kandla). That is why the industry grew there decades ago and stayed.
How to find a producer
Because there are few producers, the names are not hard to learn. Getting a direct supply contract is the harder part. Large plants often prefer steady, high-volume contracts and serve smaller buyers through appointed distributors or exporters.
These are the main routes to supply:
- A direct contract with a producer, which usually suits buyers taking regular full-container or bulk volumes.
- An authorised distributor or exporter, which can suit smaller or irregular orders if it can prove where the material comes from.
- A trader offering material from several plants, which needs extra care, because the grade and origin may change between lots.
Checking the source
Whichever route you choose, ask for the producing plant's name on the certificate of analysis, a batch or lot reference, and packing that shows the producer's marks. If a seller cannot tell you which plant made the goods, treat that as a warning. Our guide on telling a chemical trader from a manufacturer covers the checks.
Next step
We work for you, not the producer. We confirm where material is made, check samples and documents, and supervise loading. To find the right supply route for your volume, book a free sourcing review.