Abstract: The invention concerns a process for the electrochemical production of formate. The process is performed in an electrochemical cell comprising a cathode compartment containing a cathode, an anode compartment containing a nickel-based anode and an ion exchange membrane separating the anode compartment from the cathode compartment. The process comprises the following steps: (a) feeding an anolyte comprising at least one polyol to the anode compartment; (b) feeding a catholyte comprising CO2 to the cathode compartment; (c) and applying a voltage difference between the cathode and the anode such that at the cathode CO2 is reduced to formate and at the anode the at least one polyol is oxidized to formate.

Abstract: A catalyst system for catalyzed electrochemical reactions, in particular the electrochemical conversion of carbon dioxide into valuable chemical products, such as carboxylates and carboxylic acids, comprises a catalyst, wherein the catalyst comprises bismuth and indium. The catalyst system can be a component of a gas diffusion electrode, that can be used as the cathode electrode in an electrochemical cell.

Abstract: The invention concerns a process for the electrochemical production of formate. The process is performed in an electrochemical cell comprising a cathode compartment containing a cathode, an anode compartment containing a nickel-based anode and an ion exchange membrane separating the anode compartment from the cathode compartment. The process comprises the following steps: (a) feeding an anolyte comprising at least one polyol to the anode compartment; (b) feeding a catholyte comprising CO2 to the cathode compartment; (c) and applying a voltage difference between the cathode and the anode such that at the cathode CO2 is reduced to formate and at the anode the at least one polyol is oxidized to formate.

Abstract: Electrochemical conversion of CO2 to formic acid or a salt thereof, using an indium containing catalytic electrode, comprising (a) electrochemically converting CO2 to formic acid or a salt thereof by applying a voltage to an electrochemical cell comprising the catalytic electrode as cathode and an anode, wherein the electrochemical cell is fed with an electrolyte comprising CO2; and (b) regenerating the catalytic electrode by lowering the voltage and subsequently washing the catalytic electrode with an aqueous liquid and exposing the catalytic electrode to air without applying voltage; and (c) optionally repeating steps (a) and (b).

Abstract: A process for treating a dicarboxylic acid composition, with the proviso that the dicarboxylic acid is not furan 2,5-dicarboxylic acid, which process comprises: —introducing a dicarboxylic acid composition, which dicarboxylic acid composition contains an impurity compound and which impurity compound is an organic compound comprising a carbonyl group, into a cathode compartment of an electrochemical cell; and electrochemically reducing the impurity compound in the cathode compartment.

Abstract: An aromatic dicarboxylic acid of chemical formula HOOC—Ar1—COOH is prepared in a process wherein a feedstock comprising at least an aromatic aldehyde compound of chemical formula (1): OHC—Ar1—COOH, wherein Ar1 represents an arylene or heteroarylene moiety, and an aqueous electrolyte are provided; the feedstock and the aqueous electrolyte are introduced into an electrolytic cell comprising electrodes, wherein at least one of the electrodes comprises a non-noble metal and/or an oxide and/or a hydroxide thereof and/or carbon; and the aromatic aldehyde compound of formula (1) is oxidized electrochemically to yield the aromatic dicarboxylic acid.

Abstract: A process for treating a dicarboxylic acid composition, with the proviso that the dicarboxylic acid is not furan 2,5-dicarboxylic acid, which process comprises: —introducing a dicarboxylic acid composition, which dicarboxylic acid composition contains an impurity compound and which impurity compound is an organic compound comprising a carbonyl group, into a cathode compartment of an electrochemical cell; and electrochemically reducing the impurity compound in the cathode compartment.

Abstract: A process for treating a furan-2,5-dicarboxylic acid composition, which process comprises: introducing a furan-2,5-di-carboxylic acid composition, which furan-2,5-dicarboxylic acid composition contains an impurity compound and which impurity compound is 5-formyl-furan-2-carboxylic acid, into a cathode compartment of an electrochemical cell; and electrochemically reducing the impurity compound in the cathode compartment.

Abstract: A carboxylic acid-containing composition, which composition contains an aldehyde, is purified in a process, which process comprises introducing the carboxylic acid-containing composition and an aqueous electrolyte into an electrolytic cell comprising electrodes; electrochemically oxidizing the aldehyde in the electrolytic cell to obtain an electrochemically oxidized product composition comprising a carboxylic acid derived from the aldehyde; and, optionally, separating carboxylic acid from the electrochemically oxidized product composition.

Abstract: A carboxylic acid-containing composition, which composition contains an aldehyde, is purified in a process, which process comprises introducing the carboxylic acid-containing composition and an aqueous electrolyte into an electrolytic cell comprising electrodes; electrochemically oxidizing the aldehyde in the electrolytic cell to obtain an electrochemically oxidized product composition comprising a carboxylic acid derived from the aldehyde; and, optionally, separating carboxylic acid from the electrochemically oxidized product composition.

Abstract: An aromatic dicarboxylic acid of chemical formula HOOC—Ar1—COOH is prepared in a process wherein a feedstock comprising at least an aromatic aldehyde compound of chemical formula (1): OHC—Ar1—COOH, wherein Ar1 represents an arylene or heteroarylene moiety, and an aqueous electrolyte are provided; the feedstock and the aqueous electrolyte are introduced into an electrolytic cell comprising electrodes, wherein at least one of the electrodes comprises a non-noble metal and/or an oxide and/or a hydroxide thereof and/or carbon; and the aromatic aldehyde compound of formula (1) is oxidized electrochemically to yield the aromatic dicarboxylic acid.