Hypochlorites react with acids to produce chlorine.

Underwater earth-return electrodes in seawater may produce chlorine or otherwise affect water chemistry.

It reacts with acids to produce chlorine.

Rock salt is electrolyzed to produce chlorine, which is reacted with carbon monoxide to give phosgene.

This process also produced the useful by-products, chlorine and hydrogen.

Mercury cell chlor-alkali plants produce chlorine and caustic using mercury cells.

For example, in the electrolysis of brine to produce hydrogen and chlorine, the products are gaseous.

Three companies developed commercial processes for producing chlorine based on the Deacon reaction:

He then turned to chemistry and developed the Weldon process to produce chlorine by boiling hydrochloric acid with manganese dioxide.

Another earlier process to produce chlorine was to heat brine with acid and manganese dioxide.