Method for producing hydrogen chloride or an aqueous solution thereof using untreated salt water, thus produced product, use of the product and electrodialysis system

摘要

A method of producing hydrogen chloride, or an aqueous solution thereof, includes the steps: a) furnishing a first electrolyte containing chloride ions; b) carrying out an electrodialysis, wherein the first electrolyte is subjected to a cathodic reduction resulting in a catholyte, wherein the concentration of chloride ions drops in the first electrolyte, the concentration of hydroxide ions increases in the first electrolyte, and a product in the form of hydrogen chloride or an aqueous solution thereof is produced; c) processing of at least a partial quantity of the catholyte, resulting in the first electrolyte, wherein an untreated saline water is used, the concentration of chloride ions increases in the catholyte and the concentration of hydroxide ions drops in the catholyte; and d) at least partial reuse of the catholyte processed according to step c) as the first electrolyte in step b).

主权项

1. A method of producing hydrogen chloride or an aqueous solution of hydrogen chloride by using an untreated saline water, the method comprising the steps of:
furnishing a first electrolyte, wherein the first electrolyte contains chloride ions having an initial concentration of chloride ions; carrying out a first electrodialysis, wherein:
the first electrolyte is subjected to a first cathodic reduction from which results a first catholyte;the concentration of chloride ions drops in the first electrolyte;a concentration of hydroxide ions increases in the first electrolyte; anda first product in a form of hydrogen chloride or an aqueous solution of hydrogen chloride is produced; processing at least a partial quantity of the first catholyte, from which results a second electrolyte, wherein:
the untreated saline water is used;the concentration of chloride ions increases in the first catholyte; andthe concentration of hydroxide ions drops in the first catholyte; furnishing a third electrolyte, wherein the third electrolyte contains chloride ions, and wherein the third electrolyte comprises at least a partial quantity of the second electrolyte; and carrying out a second electrodialysis, wherein:
the third electrolyte is subjected to a second cathodic reduction from which results a second catholyte;the concentration of chloride ions drops in the third electrolyte;a concentration of hydroxide ions increases in the third electrolyte; anda second product in a form of hydrogen chloride or an aqueous solution of hydrogen chloride is produced.