... , production of dyes, plastics, pharmaceutical and organic intermediates, the old rubber recycling, metal sodium, water electrolysis as well as the inorganic salt ... the non-volatile sodium salts which can be removed. The waste which is formed is toxic and difficult to deal with ... In 2006, Trafigura used the process and then dumped the waste in Africa.B. Paper makingSodium hydroxide was also widely used ...