Production of formic acid
First Claim
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1. A process for producing formic acid from a carbohydrate-containing material, the process comprising:
- introducing a carbohydrate-containing material to a first reactor of a first reactor system;
hydrolyzing the carbohydrate-containing material in the first reactor in the presence of a mineral acid for a first time period at a first temperature and a first pressure to form in the first reactor system an intermediate hydrolysate comprising one or more sugars;
transferring the intermediate hydrolysate from the first reactor system to a second reactor;
hydrolyzing the intermediate hydrolysate in the second reactor for a second time period at a second temperature less than 195 degrees C. and a second pressure to form a hydrolysate product comprising formic acid, wherein at least a portion of the formic acid formed during hydrolyzing the intermediate hydrolysate is in a vapor form;
continuously removing the at least a portion of formic acid in the vapor form from the second reactor during hydrolyzing the intermediate hydrolysate; and
collecting the formic acid in a condensate form from the formic acid in the vapor form.
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Abstract
Processes for producing formic acid from a carbohydrate-containing material include hydrolyzing a carbohydrate-containing material (e.g., cellulose) in the presence of a mineral acid to form an intermediate hydrolysate comprising one or more sugars, and hydrolyzing the intermediate hydrolysate to form a hydrolysate product including formic acid.
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Citations
22 Claims
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1. A process for producing formic acid from a carbohydrate-containing material, the process comprising:
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introducing a carbohydrate-containing material to a first reactor of a first reactor system; hydrolyzing the carbohydrate-containing material in the first reactor in the presence of a mineral acid for a first time period at a first temperature and a first pressure to form in the first reactor system an intermediate hydrolysate comprising one or more sugars; transferring the intermediate hydrolysate from the first reactor system to a second reactor; hydrolyzing the intermediate hydrolysate in the second reactor for a second time period at a second temperature less than 195 degrees C. and a second pressure to form a hydrolysate product comprising formic acid, wherein at least a portion of the formic acid formed during hydrolyzing the intermediate hydrolysate is in a vapor form; continuously removing the at least a portion of formic acid in the vapor form from the second reactor during hydrolyzing the intermediate hydrolysate; and collecting the formic acid in a condensate form from the formic acid in the vapor form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification