Lignocellulose pretreatment method and system

Abstract

The invention discloses a method for preprocessing lignocellulose, which comprises: installing the lignocellulose into a recycle reactor, injecting diluted acid, opening a circulating pump to carry out cyclic reaction under the temperature of 50DEG C-200DEG C, acid-removing and filtering hydrolyzate which is obtained after finishing the reaction, and using the hydrolyzate to ferment. The inventionalso discloses a system which is applied in the method. The method of the invention can effectively increase the conversion rate of hemicellulose and the conversion rate of cellulase hydrolysis in the lignocellulose, fermentation inhibiting products are reduced, simultaneously, the time for preprocessing also can be shortened, and the energy consumption is lowered.

Description

Technical field

[0001] The invention belongs to the field of chemical equipment, and specifically relates to a method and equipment for pretreating lignocellulose by using dilute acid. Background technique

[0002] Lignocellulose pretreatment refers to the use of chemical and physical methods to separate the three components of cellulose from lignin and hemicellulose. At the same time, it opens the internal hydrogen bonds of cellulose to become amorphous cellulose, breaks some glycosidic bonds, reduces the degree of polymerization, hydrolyzes hemicellulose into monosaccharides such as xylose and arabinose, and improves the efficiency of subsequent enzymatic hydrolysis. The current pretreatment methods include concentrated acid method, dilute acid temperature baking method, alkali treatment method, sulfur dioxide method, peroxide method, steam explosion method, ammonia fiber explosion method, carbon dioxide explosion method, wet oxidation method, hydrothermal method, etc. Kind of...

Examples

Embodiment 1

[0024] Corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash 5.52%) are air-dried and crushed, and then charged into the dilute acid cycle from the inlet 12 Device 10, open valve 1 and valve 2, and inject 0.8% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1:10; open valve 3, valve 4, close valve 1, valve 2, start circulating pump 9, the flow rate is set to 10L / min, the liquid level is located at the upper end of the filter plate 13 during the reaction, at 95 ℃ Circulate the reaction for 4 hours. During the reaction, the liquid part is circulated through the filter plate 13, and the solid material part is blocked by the filter plate 13 and left in the reactor. The liquid part passes through the pump 9 and then returns to the reactor by spraying through the spray head 14 Medium; after the reaction is over, close valve 4 and pump 9, open valve 2, ...

Embodiment 2

[0026] Corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash 5.52%) are air-dried and crushed, and then charged into the dilute acid cycle from the inlet 12 Device 10, open valve 1 and valve 2, and inject 0.8% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1:10; open valve 3, valve 4, close valve 1, valve 2, start the circulating pump 9, the flow is set to 10L / min, the liquid level is located at the upper end of the filter plate 13 during the reaction, at 90 ℃ Circulate the reaction for 4 hours. During the reaction, the liquid part is circulated through the filter plate 13, and the solid material part is blocked by the filter plate 13 and left in the reactor. The liquid part passes through the pump 9 and then returns to the reactor by spraying through the spray head 14 Medium; after the reaction is over, close valve 4 and pump 9, open valve 2, v...

Embodiment 3

[0028] Corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash 5.52%) are air-dried and crushed, and then charged into the dilute acid cycle from the inlet 12 Device 10, open valve 1 and valve 2, and inject 0.8% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1:10; open valve 3, valve 4, close valve 1, valve 2, start circulating pump 9, the flow is set to 10L / min, the liquid level is located at the upper end of the filter plate 13 during the reaction, at 85 ℃ Circulate the reaction for 4 hours. During the reaction, the liquid part is circulated through the filter plate 13, and the solid material part is blocked by the filter plate 13 and left in the reactor. The liquid part passes through the pump 9 and then returns to the reactor by spraying through the spray head 14 Medium; after the reaction is over, close valve 4 and pump 9, open valve 2, valve...

Technical field

[0001] The invention belongs to the field of chemical equipment, and specifically relates to a method and equipment for pretreating lignocellulose by using dilute acid. Background technique

[0002] Lignocellulose pretreatment refers to the use of chemical and physical methods to separate the three components of cellulose from lignin and hemicellulose. At the same time, it opens the internal hydrogen bonds of cellulose to become amorphous cellulose, breaks some glycosidic bonds, reduces the degree of polymerization, hydrolyzes hemicellulose into monosaccharides such as xylose and arabinose, and improves the efficiency of subsequent enzymatic hydrolysis. The current pretreatment methods include concentrated acid method, dilute acid temperature baking method, alkali treatment method, sulfur dioxide method, peroxide method, steam explosion method, ammonia fiber explosion method, carbon dioxide explosion method, wet oxidation method, hydrothermal method, etc. Kind of...

Examples

Embodiment 1

[0024] Corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash 5.52%) are air-dried and crushed, and then charged into the dilute acid cycle from the inlet 12 Device 10, open valve 1 and valve 2, and inject 0.8% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1:10; open valve 3, valve 4, close valve 1, valve 2, start circulating pump 9, the flow rate is set to 10L / min, the liquid level is located at the upper end of the filter plate 13 during the reaction, at 95 ℃ Circulate the reaction for 4 hours. During the reaction, the liquid part is circulated through the filter plate 13, and the solid material part is blocked by the filter plate 13 and left in the reactor. The liquid part passes through the pump 9 and then returns to the reactor by spraying through the spray head 14 Medium; after the reaction is over, close valve 4 and pump 9, open valve 2, ...

Embodiment 2

[0026] Corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash 5.52%) are air-dried and crushed, and then charged into the dilute acid cycle from the inlet 12 Device 10, open valve 1 and valve 2, and inject 0.8% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1:10; open valve 3, valve 4, close valve 1, valve 2, start the circulating pump 9, the flow is set to 10L / min, the liquid level is located at the upper end of the filter plate 13 during the reaction, at 90 ℃ Circulate the reaction for 4 hours. During the reaction, the liquid part is circulated through the filter plate 13, and the solid material part is blocked by the filter plate 13 and left in the reactor. The liquid part passes through the pump 9 and then returns to the reactor by spraying through the spray head 14 Medium; after the reaction is over, close valve 4 and pump 9, open valve 2, v...

Embodiment 3

[0028] Corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash 5.52%) are air-dried and crushed, and then charged into the dilute acid cycle from the inlet 12 Device 10, open valve 1 and valve 2, and inject 0.8% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1:10; open valve 3, valve 4, close valve 1, valve 2, start circulating pump 9, the flow is set to 10L / min, the liquid level is located at the upper end of the filter plate 13 during the reaction, at 85 ℃ Circulate the reaction for 4 hours. During the reaction, the liquid part is circulated through the filter plate 13, and the solid material part is blocked by the filter plate 13 and left in the reactor. The liquid part passes through the pump 9 and then returns to the reactor by spraying through the spray head 14 Medium; after the reaction is over, close valve 4 and pump 9, open valve 2, valve...

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