Uhde Gmbh

Thyssenkrupp Uhde Chlorine Engineers (italia) S.r.

Thyssenkrupp Uhde Chlorine Engineers S.r.l.

Sami Petteri Pelkonen

Werner Pohl

Thomas Steinmetz

Antonius Jacobus Gerardus Manders

Jacoba Cornelia Petronella Adriana Oonincx

Massimo Giosafatte Borghesi

Christoph Stegemann

Antonius Jacobus Manders

Jacoba Cornelia Oonincx

The invention provides a process for producing chlorine, alkaline metal hydroxide, and hydrogen which comprises the following steps: (a) preparing a brine by dissolving an alkaline metal chloride source in water; (b) removing alkaline precipitates from the brine prepared in step (a) in the presence of hydrogen peroxide by means of a filter of active carbon, and recovering the resulting brine; (c) subjecting at least part of the resulting brine as obtained in step (b) to an ion-exchange step; (d) subjecting at least part of the brine as obtained in step (c) to a membrane electrolysis step; (e) recovering at least part of the chlorine, alkaline metal hydroxide, hydrogen, and brine as obtained in step (d); (f) subjecting at least part of the brine as recovered in step (e) to a dechlorination step; and (g) recycling at least part of the dechlorinated brine obtained in step (f) to step (a).

Process for producing chlorine, caustic soda, and hydrogen

A process for removing silicon compounds from aqueous NaCl brine includes, first, adjusting a weak brine to a pH value of less than 3 with hydrochloric acid. Iron(III) chloride or other trivalent iron ions are added to the acidified weak brine, the obtained weak brine is then continuously fed to a stirred dissolution vessel which contains undissolved salt in addition to brine. Fresh salt is charged batch-wise and intermittently to the dissolution vessel to produce strong brine. The obtained strong brine is fed to a stirred buffer vessel, the pH value in this buffer vessel being maintained at a level ranging from 5 to 8. A strong-brine flow is continuously withdrawn from the buffer vessel and filtered, and the filtrate containing the added iron and silicon is discharged. Also a system for carrying out this process is disclosed.

Removal of silicon from brine

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Dortmund, Germany

Sami Petteri Pelkonen