Abstract:
A process for regenerating catalysts that have been deactivated or poisoned during hydrogenation of biomass, sugars and polysaccharides is described, in which polymerized species that have agglomerated to catalyst surfaces can be removed by means of washing the catalyst with hot water at subcritical temperatures. A feature of the process can regenerate the catalysts in situ, which allows the process to be adapted for used in continuous throughput reactor systems. Also described is a continuous hydrogenation process that incorporated the present regeneration process.
Abstract:
A method of isolating and purifying 1,2,5,6 hexanetetrol (HTO) from a reaction mixture containing HTO and other byproducts of a hydrogenation reaction of a sugar alcohol and/or a mono- or di-dehydrative product of a sugar alcohol is described. The method involves contacting the mixture comprising HTO and other C1-C6 alcohols and polyols with a resin material adapted for chromatography under conditions where HTO preferentially associates with the resin relative to other components in the mixture, and eluting HTO from said resin with a solvent.
Abstract:
Disclosed herein are methods for forming ammonium salts of C4 diacids in a fermentation process with simultaneous removal of divalent metal carbonate salts. The pH of fermentation broths obtained during the production of fumaric, maleic, malic, and/or succinic acid by a microorganism is controlled by using alkaline oxygen containing calcium or magnesium compounds in the hydroxide, oxide, carbonate or bicarbonate forms—forming divalent metal salts of the diacids that are partially or wholly insoluble in the broth. The calcium or magnesium salts of the diacids are substituted with ammonium by introduction of ammonium salts at elevated temperature and pressure dissolving precipitated divalent metal cation salts of the diacids and forming soluble ammonium salts thereof. Carbonate in the form of CO2 or bicarbonate is simultaneously added to the fermentation media at the elevated temperature and pressure. The temperature and pressure are then reduced forming insoluble divalent metal carbonate salts that are separated from the solubilized ammonium diacid salts. The recovered metal carbonate salts can be recycled as pH control materials in subsequent fermentation reactions. Also disclosed is use of the solubilized ammonium diacid salts directly as a reagent for hydrogenation to form the derivatives N-methyl-2-pyrrolidone (NMP) gamma-butyrolactone (GBL) and 1,4-butane-diol (BDO) in single pot reactions.
Abstract:
A process for regenerating catalysts that have been deactivated or poisoned during hydrogenation of biomass, sugars and polysaccharides is described, in which polymerized species that have agglomerated to catalyst surfaces can be removed by means of washing the catalyst with hot water at subcritical temperatures. A feature of the process can regenerate the catalysts in situ, which allows the process to be adapted for used in continuous throughput reactor systems. Also described is a continuous hydrogenation process that incorporated the present regeneration process.
Abstract:
A method of isolating and purifying a product of sugar alcohol or anhydrosugar alcohol hydrogenolysis from a reaction mixture containing sorbitans, 1,2,4-butanetriol (BTO), 1,2,5,6-hexanetetrol (HTO), among other byproducts of a hydrogenolysis reaction of a sugar alcohol and/or a mono- or di-dehydrative product of a sugar alcohol is described. The method involves contacting the mixture having the products of sugar alcohol or anhydrosugar alcohol hydrogenation and other C1-C6 alcohols and polyols with a resin material adapted for chromatography under conditions where the products preferentially associates with the resin relative to other components in the mixture, and eluting products from the resin with a solvent. The method suggests a way for separation of aliphatic polyols generated from the hydrogenolysis of sugar alcohols or anhydrosugar alcohols.
Abstract:
A process for regenerating catalysts that have been deactivated or poisoned during hydrogenation of biomass, sugars and polysaccharides is described, in which polymerized species that have agglomerated to catalyst surfaces can be removed by means of washing the catalyst with hot water at subcritical temperatures. A feature of the process can regenerate the catalysts in situ, which allows the process to be adapted for used in continuous throughput reactor systems. Also described is a continuous hydrogenation process that incorporated the present regeneration process.
Abstract:
A method of isolating and purifying a product of sugar alcohol or anhydrosugar alcohol hydrogenolysis from a reaction mixture containing sorbitans, 1,2,4-butanetriol (BTO), 1,2,5,6-hexanetetrol (HTO), among other byproducts of a hydrogenolysis reaction of a sugar alcohol and/or a mono- or di-dehydrative product of a sugar alcohol is described. The method involves contacting the mixture having the products of sugar alcohol or anhydrosugar alcohol hydrogenation and other C1-C6 alcohols and polyols with a resin material adapted for chromatography under conditions where the products preferentially associates with the resin relative to other components in the mixture, and eluting products from the resin with a solvent. The method suggests a way for separation of aliphatic polyols generated from the hydrogenolysis of sugar alcohols or anhydrosugar alcohols.
Abstract:
A method of isolating and purifying 1,2,5,6 hexanetetrol (HTO) from a reaction mixture containing HTO and other byproducts of a hydrogenation reaction of a sugar alcohol and/or a mono- or di-dehydrative product of a sugar alcohol is described. The method involves contacting the mixture comprising HTO and other C1-C6 alcohols and polyols with a resin material adapted for chromatography under conditions where HTO preferentially associates with the resin relative to other components in the mixture, and eluting HTO from said resin with a solvent.
Abstract:
A process for regenerating catalysts that have been deactivated or poisoned during hydrogenation of biomass, sugars and polysaccharides is described, in which polymerized species that have agglomerated to catalyst surfaces can be removed by means of washing the catalyst with hot water at subcritical temperatures. A feature of the process can regenerate the catalysts in situ, which allows the process to be adapted for used in continuous throughput reactor systems. Also described is a continuous hydrogenation process that incorporated the present regeneration process.