Procedure for obtaining fumaric acid directly from aqueous and colored solutions of maleic acid (Machine-translation by Google Translate, not legally binding)

摘要

Process for obtaining fumaric acid directly from aqueous and colored solutions of maleic acid, characterized in that these have a color of up to 7 Gardner V scale and by comprising treating these solutions at a temperature of the order of 55º to 85º C, with a compound soluble that provides bromine and in which the valence of this body is less than 5, together with an insulating agent; the initial concentration of maleic acid is of the order of 10 to 70% by weight; the bromine content of the added material is at a ratio corresponding to at least 0.001% bromine (calculated at the ammonium bromide level) based on the weight of maleic acid; the oxidizing agent has an oxidation force of at least about 1.23 volts and is present in an amount corresponding to 0.003 to 10% based on the weight of maleic acid. (Machine-translation by Google Translate, not legally binding)