2. Chemical manufacturing process

2.1 Process principle

It involves chlorinating soda ash with chlorine gas. There are two chemical processes for making bleach.

• Standard process

  He reacts the chlorine with a 20% soda solution, resulting in bleach with 13% active chlorine (previously known as "50˚ chlorometric"). All the sodium chloride by-product of the reaction remains dissolved in the solution.

• High-title" process

  An original process patented by Arkema, it reacts chlorine with a 50% sodium hydroxide solution to produce bleach with 24-26% active chlorine (previously known as "105˚ chlorometric"), in which half the salt is removed by precipitation. Solutions...