Process for preparing ethylene glycol from a carbohydrate source
First Claim
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1. Process for preparing ethylene glycol from a carbohydrate source,wherein hydrogen, the carbohydrate source, a liquid diluent and a catalyst system are provided as reactants into a reaction zone;
- wherein the catalyst system comprises a tungsten compound and at least one hydrogenolysis metal selected from the noble metals Pd, Pt, Ru, Rh, Ir and combinations thereof;
wherein the carbohydrate source is introduced into the reaction zone such that in the reaction zone the concentration of the carbohydrate source in the diluent is at least 4% by wt, calculated as weight of carbohydrate source per weight of diluent;
wherein the amount of the at least one hydrogenolysis metal selected from the noble metals Pd, Pt, Ru, Rh, Ir and combinations thereof ranges from 0.2 to 1.0% by wt, calculated as the metal and based on the amount of carbohydrate source introduced into the reaction zone;
wherein the molar ratio of tungsten to the at least one hydrogenolysis metal is in the range of 1 to 25; and
wherein the carbohydrate source is reacted with hydrogen in the presence of the catalyst system to yield an ethylene glycol-containing product.
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Abstract
Ethylene glycol is prepared from a carbohydrate source in a process,
- wherein hydrogen, the carbohydrate source, a liquid diluent and a catalyst system are provided as reactants into a reaction zone;
- wherein the catalyst system comprises a tungsten compound and at least one hydrogenolysis metal selected from the noble metals Pd, Pt, Ru, Rh, Ir and combinations thereof;
- wherein the carbohydrate source is introduced into the reaction zone such that in the reaction zone the concentration of the carbohydrate source in the diluent is at least 4% wt, calculated as weight of carbohydrate source per weight of diluent;
- wherein the amount of the at least one hydrogenolysis metal selected from the noble metals Pd, Pt, Ru, Rh, Ir and combinations thereof ranges from 0.2 to 1.0% wt, calculated as the metal and based on the amount of carbohydrate source introduced into the reaction zone;
- wherein the molar ratio of tungsten to the at least one hydrogenolysis metal is in the range of 1 to 25; and
- wherein the carbohydrate source is reacted with hydrogen in the presence of the catalyst system to yield an ethylene glycol-containing product.
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23 Claims
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1. Process for preparing ethylene glycol from a carbohydrate source,
wherein hydrogen, the carbohydrate source, a liquid diluent and a catalyst system are provided as reactants into a reaction zone; -
wherein the catalyst system comprises a tungsten compound and at least one hydrogenolysis metal selected from the noble metals Pd, Pt, Ru, Rh, Ir and combinations thereof; wherein the carbohydrate source is introduced into the reaction zone such that in the reaction zone the concentration of the carbohydrate source in the diluent is at least 4% by wt, calculated as weight of carbohydrate source per weight of diluent; wherein the amount of the at least one hydrogenolysis metal selected from the noble metals Pd, Pt, Ru, Rh, Ir and combinations thereof ranges from 0.2 to 1.0% by wt, calculated as the metal and based on the amount of carbohydrate source introduced into the reaction zone; wherein the molar ratio of tungsten to the at least one hydrogenolysis metal is in the range of 1 to 25; and wherein the carbohydrate source is reacted with hydrogen in the presence of the catalyst system to yield an ethylene glycol-containing product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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