By-products (impurity) removal
AssigneeSedo Engineering SA
InventorsDavid Crettenand, Grégoire Chappot, Ludovic Chappot, Herbert Gübeli
Life of this patent
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Abstract
An electrolytic reactor comprises at least one electrolytic cell with an anode compartment and a cathode compartment separated by a separator, in particular a semipermeable membrane. The anode compartment comprises an inlet and an outlet for anolyte at opposed ends, said inlet and outlet being connected with each other via an anolyte circulation pipe equipped with a storage means for anolyte, an anolyte vessel and at least one adsorption filter for adsorbing molecular impurities. When molecular impurities comes from the cathode compartment through the separator, the electrolytic reactor acts also as a cleaning device for the catholyte.
Claims20
An electrolytic reactor suitable for reducing a vat dye or sulphur dye, said reactor comprising at least one electrolytic cell with an anode compartment and a cathode compartment, said compartments being separated by a separator, said compartments each comprising an inlet and an outlet for anolyte and catholyte, respectively, at opposed ends, said inlet and outlet of the anode compartment being connected with each other via an anolyte circulation pipe and said inlet and outlet of the cathode compartment being connected with each other via catholyte circulation pipe, said anolyte circulation pipe being equipped with an anolyte vessel to form an anolyte circuit and said catholyte circulation pipe being equipped with a main vessel to form a catholyte circuit, wherein the anolyte circulation pipe is further equipped with at least one adsorption filter, said adsorption filter comprising an adsorption material for adsorbing molecular impurities, said catholyte circuit comprising a catholyte comprising a vat dye or sulphur dye.
A method for improving anode performance in vat dye or sulfur dye reduction, said method comprising continuous cleaning of anolyte in an adsorption filter integrated in an anolyte circulation pipe or anolyte circulation loop, respectively, by continuously flowing the anolyte through the adsorption filter;
- wherein said anolyte circulation pipe or anolyte circulation loop connects an inlet of an anode compartment with an outlet of an anode compartment and wherein said inlet and said outlet are disposed at opposed ends of said anode compartment, and said anolyte circulation pipe or anolyte circulation loop is equipped with an anolyte vessel to form an anolyte circuit.
A method for removing undesired molecular products and/or by-products and/or impurities from an anolyte in an electrochemical vat dye or sulfur dye reduction process, wherein at least part of said undesired products and/or by-products and/or impurities are reaction products and/or by-products and/or impurities present or formed in the catholyte, and which pass through the semi-permeable membrane into the anolyte where they are adsorbed on an adsorption filter resulting in the purification of the catholyte;
- wherein said adsorption filter is integrated in an anolyte circulation pipe or anolyte circulation loop connecting an inlet of an anode compartment with an outlet of the anode compartment and wherein said inlet and said outlet are disposed at opposed ends of said anode compartment, and said anolyte circulation pipe or anolyte circulation loop is equipped with an anolyte vessel to form an anolyte circuit.
Dependencies are inferred from the claim text.