Method for pretreating straw pentose hydrolyzate for fermentation
A five-carbon sugar water and pretreatment technology, applied in the field of fermentation engineering, can solve problems such as insufficient utilization of resources
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Embodiment 1
[0012] Mix air-dried wheat straw with 0.5% sulfuric acid at a solid-to-liquid ratio of 1:7, and hydrolyze it at 115°C for 2 hours to prepare a five-carbon sugar solution. The prepared five-carbon sugar solution first enters the heating kettle of the furfural distillation tower, maintains the temperature at 99°C, and distills under reduced pressure at a vacuum degree of 0.02MPa to obtain crude furfural, which is obtained by rectification and dehydration to obtain furfural products. The five-carbon sugar liquid distilled under reduced pressure is used to separate the acid radical ions in the liquid through an electrodialysis device. Separation conditions: temperature 30°C, current density 800A / m 2 . Finally, sulfuric acid, formic acid and acetic acid were separated and purified by ion exchange. The treated five-carbon sugar solution is used as a fermentation medium for chemical products such as ethanol and acetone butanol.
Embodiment 2
[0014] Mix air-dried rice straw with 0.3% sulfuric acid at a solid-to-liquid ratio of 1:7, and hydrolyze it at 125°C for 5 hours to prepare a five-carbon sugar solution. The prepared five-carbon sugar solution first enters the heating kettle of the furfural distillation tower, maintains the temperature at 70°C, and distills under reduced pressure at a vacuum degree of 0.05 MPa to obtain crude furfural, which is obtained by rectification and dehydration to obtain furfural products. The five-carbon sugar liquid distilled under reduced pressure is used to separate acid radical ions in the liquid through an electrodialysis device. Separation conditions: temperature 20°C, current density 1200A / m 2 . Finally, sulfuric acid, formic acid and acetic acid were separated and purified by ion exchange. The treated five-carbon sugar solution is used as a fermentation medium for chemical products such as ethanol and acetone butanol.
Embodiment 3
[0016] Mix air-dried corn stalks with 0.5% sulfuric acid at a solid-to-liquid ratio of 1:6, and hydrolyze them at 130°C for 3 hours to prepare a five-carbon sugar solution. The prepared five-carbon sugar solution first enters the heating kettle of the furfural distillation tower, maintains the temperature at 85°C, and distills under reduced pressure at a vacuum degree of 0.04MPa to obtain crude furfural, which is obtained through rectification and dehydration to obtain furfural products. The five-carbon sugar liquid distilled under reduced pressure is used to separate the acid radical ions in the liquid through an electrodialysis device. Separation conditions: temperature 30°C, current density 800A / m 2 . Finally, sulfuric acid, formic acid and acetic acid were separated and purified by ion exchange. The treated five-carbon sugar solution is used as a fermentation medium for chemical products such as ethanol and acetone butanol.
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