Process for recovering and regenerating a catalyst from ash
AssigneeAvantium Knowledge Centre B.V.
InventorsDavide Ansovini, Benjamin McKay, Jagdeep Singh
Life of this patent
Estimating the term…
Abstract
A process for recovering and regenerating a tungsten compound suitable as co-catalyst in converting carbohydrates with hydrogen into alkylene glycols and polyols, from ash comprising one or more tungsten-oxygen components (e.g. comprising a tungstate and/or tungstic acid). Such ash is obtainable from burning a liquid mixture comprising alkylene glycols and/or polyols and sodium tungstate and/or tungstic acid.
Claims12
A process for recovering and regenerating a tungsten compound suitable as co-catalyst in converting carbohydrates with hydrogen into alkylene glycols and polyols, from ash comprising one or more tungsten-oxygen components wherein said process comprises the steps of:
- a. contacting the ash with an inorganic acid having a pH of below 2;
- b. separating the mixture obtained from step a. in a solid fraction and a liquid fraction;
- c. washing the solid fraction obtained by step b. with an aqueous liquid;
- and
- d. solubilising at least a part of the washed solids obtained by step c. in an alkylene glycol composition and dissolving an alkali hydroxide in said alkylene glycol composition, wherein the amount of alkali hydroxide is chosen such that the molar ratio alkali hydroxide:tungstic acid in the resulting composition is between 0.2 and 2.
Dependencies are inferred from the claim text.