CN111763272B - A kind of drying method and production method of hemicellulose - Google Patents
A kind of drying method and production method of hemicellulose Download PDFInfo
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Abstract
The invention relates to the technical field of hemicellulose production, and discloses a drying method and a production method of hemicellulose. The drying method of the hemicellulose comprises the steps of mixing a hemicellulose suspension liquid with the pH value of 5-6 and the water content of 5-15% with ammonium carbonate, and drying to obtain the hemicellulose. The drying temperature is 60-80 ℃. The method for producing hemicellulose by adopting the drying method comprises the following steps: step a, extracting hemicellulose by adopting cold alkali extraction, neutralizing with sulfuric acid, and centrifugally washing to obtain a hemicellulose suspension with pH of 5-6 and water content of 5-15%; and step b, drying to obtain the hemicellulose by adopting the drying method. Compared with the traditional hemicellulose drying method, the method has the advantages that the performance of the hemicellulose obtained by mixing the ammonium carbonate solid with the hemicellulose solution and drying is better than that of the hemicellulose obtained under the natural air drying condition, the performance of the hemicellulose obtained under the cold drying condition is close to that of the hemicellulose obtained under the cold drying condition, the cost is saved, the reagent can be recovered, the method is green and pollution-free, and the like, and the method is used for large-scale production of enterprises.
Description
Technical Field
The invention relates to the technical field of chemical fiber manufacturing, in particular to a drying method and a production method of hemicellulose.
Background
With the increasing understanding of the increasingly scarce condition of non-renewable resources such as petroleum, coal and the like, the development and utilization of renewable resources become the common concern of people, and the conversion of agricultural and forestry wastes into new energy, new materials, medicines and chemical raw materials becomes a very important new research direction. The main components of the agriculture and forestry biomass resources comprise cellulose, hemicellulose and lignin, wherein the content of the hemicellulose is second to that of the cellulose, the cellulose has good biological activity and biocompatibility, and the biomass resources have very important application in the fields of medicines, chemical engineering, materials and the like.
At present, common methods for drying hemicellulose comprise freeze drying, spray drying and the like, but the methods have higher requirements on equipment and lower economic benefits, the freeze drying also limits that a solvent can only be water, and a more energy-saving method for drying the hemicellulose needs to be researched in order to save cost.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for drying hemicellulose.
It is another object of the present invention to provide a method for producing hemicellulose.
The purpose of the invention is realized by the following technical scheme:
a drying method of hemicellulose is characterized by mixing a hemicellulose suspension liquid with pH of 5-6 and water content of 5-15% with ammonium carbonate, and drying to obtain the hemicellulose.
The hemicellulose suspension with the water content of 5-15% can be fully mixed with ammonium carbonate, and has the optimal drying time.
Preferably, the drying temperature is 60-80 ℃.
Preferably, the drying process is stirred. Preferably, the stirring is performed once in half an hour during the drying process.
Preferably, the ammonium carbonate is selected from ammonium carbonate with a water-salt ratio of 1: 0.8-1.2.
Preferably, the mass ratio of hemicellulose to ammonium carbonate is 1:48 to 1: 57.
Preferably, the mass ratio of hemicellulose to ammonium carbonate is 1: 48.
A hemicellulose production method adopting the drying method comprises the following steps:
step a, extracting hemicellulose by adopting cold alkali extraction, neutralizing with sulfuric acid, and centrifugally washing to obtain a hemicellulose suspension with pH of 5-6 and water content of 5-15%;
and b, mixing the hemicellulose suspension with ammonium carbonate by using the drying method of any one of claims 1 to 4, and drying to obtain the hemicellulose.
Preferably, the step a includes:
placing the chemical pulp into a beaker filled with a sodium hydroxide solution, starting a mechanical stirrer to uniformly disperse the chemical pulp in the sodium hydroxide solution, and starting cold caustic extraction;
after the cold alkali extraction is finished, carrying out suction filtration on the chemical pulp suspension in a Buchner funnel, and returning suction filtration liquid to remove fine fibers in the solution;
pouring the hemicellulose alkali extract in the filter flask into a beaker, and slowly neutralizing alkali liquor with sulfuric acid under the condition of electric stirring until the pH value is 2-3;
washing the hemicellulose turbid liquid with the pH value of 2-3 to the pH value of 5-6 by continuous operations of centrifugation, deionized water addition, emulsification, centrifugation and the like;
adding water to all the hemicellulose in all the centrifugal tubes for emulsification and uniform dispersion to prepare a hemicellulose suspension with the concentration of 5-15%.
Preferably, the chemical pulp is bamboo kraft chemical pulp.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the hemicellulose is extracted by using the alkali solution, and is dried by the oven after being mixed with the ammonium carbonate, so that the cost is greatly saved, the requirement on instruments is greatly reduced, and a foundation is laid for large-scale production of enterprises.
Compared with the traditional hemicellulose drying method, the method has the advantages that the performance of the hemicellulose obtained by mixing the ammonium carbonate solid with the hemicellulose solution and drying is better than that of the hemicellulose obtained under the natural air drying condition, the performance of the hemicellulose obtained under the cold drying condition is close to that of the hemicellulose obtained under the cold drying condition, the cost is saved, the reagent can be recovered, the method is green and pollution-free, and the like, and the method is used for large-scale production of enterprises.
Description of the drawings:
FIG. 1 specific data for initial weight as a function of time at different temperatures for ammonium carbonate mixed with hemicellulose at a mass ratio of 48: 1;
FIG. 2 is a graph of the drying times for different mixing ratios of ammonium carbonate to hemicellulose at 75 deg.C;
FIG. 3 shows a sample of hemicellulose dried at different temperatures and different ratios at 75 ℃ with ammonium carbonate mixed with hemicellulose in a mass ratio of 48: 1.
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
Example 1
A method for producing hemicellulose comprising the steps of:
(hemicellulose dried at 60 ℃ C.)
The chemical pulp sheet was shredded and 50g was reserved. Placing 50g of absolute dry bamboo sulfate chemical pulp into a beaker filled with 1L of sodium hydroxide solution (2.5mol/L) (the mass of 1L of sodium hydroxide solution needs to be weighed and measured to be m1), starting a mechanical stirrer to uniformly disperse pulp fibers in the sodium hydroxide solution, and starting cold alkali extraction (time is 1 h); after cold alkali extraction is finished, carrying out suction filtration on the pulp suspension in a Buchner funnel (a 200-mesh nonmetal filter screen is treated by cold alkali in advance and is washed clean by deionized water) (a filter bottle is weighed in advance for calculating the mass of alkali extraction liquid), and returning and pumping the filtrate once again to remove fine fibers in the solution;
closing the vacuum suction filtration pump, weighing the total weight of the filtrate and the suction filtration bottle, and deducting the mass of the suction filtration bottle to obtain the mass (m2) of the sodium hydroxide filtrate obtained by extraction; slowly pouring sodium hydroxide solution with the mass of (m1-m2) into the upper part of the pulp cake, standing for 2min, starting a vacuum filtration pump, replacing and washing the sodium hydroxide solution in the pulp pump into a vacuum filtration bottle, and weighing the total weight of the filtration bottle again to obtain the total mass m3 of the hemicellulose alkali extract.
Pouring the hemicellulose alkali extract in the filter flask into a beaker with the volume of 2L, slowly adding 2.0mol of sulfuric acid neutralizing alkali liquor (adjusting the pH value by using 0.1mol/L sulfuric acid when the pH value is reduced quickly) under the premise of electric stirring until the pH value is 2.5; washing the hemicellulose suspension with the pH value of 2.5 to the pH value of about 5.5 by continuous operations of centrifugation, deionized water addition, emulsification, centrifugation and the like; adding water to all the hemicelluloses in the centrifugal tubes for emulsification and uniform dispersion to prepare a 10% hemicellulose suspension.
A method of drying hemicellulose comprising:
taking 5g of the prepared 10% hemicellulose suspension, recording the weight of the culture dish, adding 24g of ammonium carbonate with a water-salt ratio of 1:1, uniformly mixing, putting the mixture into a 60-degree oven for drying, weighing once every hour, recording the weight, stirring the sample again to enable the state of the sample to be consistent until the weight of the sample does not continuously decrease along with the increase of time, making a curve of the change of the mass along with the time, and photographing and recording the state of the dried hemicellulose under the condition of 60 degrees.
Example 2
A method for producing hemicellulose comprising the steps of:
(hemicellulose dried at 75 ℃ C.)
The chemical pulp sheet was shredded and 50g was reserved. Placing 50g of chemical pulp in an absolute dry amount into a beaker filled with 1L of sodium hydroxide solution (2.5mol/L) (the mass of the 1L of sodium hydroxide solution needs to be weighed and measured m1), starting a mechanical stirrer to uniformly disperse pulp fibers in the sodium hydroxide solution, and starting a cold alkali extraction experiment (time is 1 h); after cold alkali extraction is finished, carrying out suction filtration on the pulp suspension in a Buchner funnel (a 200-mesh nonmetal filter screen is treated by cold alkali in advance and is washed clean by deionized water) (a filter bottle is weighed in advance for calculating the mass of alkali extraction liquid), and returning and pumping the filtrate once again to remove fine fibers in the solution; closing the vacuum suction filtration pump, weighing the total weight of the filtrate and the suction filtration bottle, and deducting the mass of the suction filtration bottle to obtain the mass (m2) of the sodium hydroxide filtrate obtained by extraction; slowly pouring sodium hydroxide solution with the mass of (m1-m2) into the upper part of the pulp cake, standing for 2min, starting a vacuum filtration pump, replacing and washing the sodium hydroxide solution in the pulp pump into a vacuum filtration bottle, and weighing the total weight of the filtration bottle again to obtain the total mass m3 of the hemicellulose alkali extract.
Pouring the hemicellulose alkali extract in the filter flask into a beaker with the volume of 2L, slowly adding 2.0mol of sulfuric acid neutralizing alkali liquor (adjusting the pH value by using 0.1mol/L sulfuric acid when the pH value is reduced quickly) under the premise of electric stirring until the pH value is 2.5; washing the hemicellulose suspension with the pH value of 2.5 to the pH value of about 5.5 by continuous operations of centrifugation, deionized water addition, emulsification, centrifugation and the like; adding water to all the hemicelluloses in the centrifugal tubes for emulsification and uniform dispersion to prepare a 10% hemicellulose suspension.
A method of drying hemicellulose comprising:
taking 5g of the prepared 10% hemicellulose suspension, recording the weight of the culture dish, adding 24g of ammonium carbonate with a water-salt ratio of 1:1, uniformly mixing, putting the mixture into a 75-degree oven for drying, weighing once every hour, recording the weight, stirring the sample again to enable the state of the sample to be consistent until the weight of the sample does not continuously decrease along with the increase of time, making a curve of the change of the mass along with the time, and photographing and recording the state of the hemicellulose dried under the condition of 75 ℃.
Example 3
A method for producing hemicellulose comprising the steps of:
(hemicellulose dried at 80 ℃ C.)
The chemical pulp sheet was shredded and 50g was reserved. Placing 50g of chemical pulp in an absolute dry amount into a beaker filled with 1L of sodium hydroxide solution (2.5mol/L) (the mass of the 1L of sodium hydroxide solution needs to be weighed and measured m1), starting a mechanical stirrer to uniformly disperse pulp fibers in the sodium hydroxide solution, and starting a cold alkali extraction experiment (time is 1 h); after cold alkali extraction is finished, carrying out suction filtration on the pulp suspension in a Buchner funnel (a 200-mesh nonmetal filter screen is treated by cold alkali in advance and is washed clean by deionized water) (a filter bottle is weighed in advance for calculating the mass of alkali extraction liquid), and returning and pumping the filtrate once again to remove fine fibers in the solution; closing the vacuum suction filtration pump, weighing the total weight of the filtrate and the suction filtration bottle, and deducting the mass of the suction filtration bottle to obtain the mass (m2) of the sodium hydroxide filtrate obtained by extraction; slowly pouring sodium hydroxide solution with the mass of (m1-m2) into the upper part of the pulp cake, standing for 2min, starting a vacuum filtration pump, replacing and washing the sodium hydroxide solution in the pulp pump into a vacuum filtration bottle, and weighing the total weight of the filtration bottle again to obtain the total mass m3 of the hemicellulose alkali extract.
Pouring the hemicellulose alkali extract in the filter flask into a beaker with the volume of 2L, slowly adding 2.0mol of sulfuric acid neutralizing alkali liquor (adjusting the pH value by using 0.1mol/L sulfuric acid when the pH value is reduced quickly) under the premise of electric stirring until the pH value is 2.5; washing the hemicellulose suspension with the pH value of 2.5 to the pH value of about 5.5 by continuous operations of centrifugation, deionized water addition, emulsification, centrifugation and the like; adding water to all the hemicelluloses in the centrifugal tubes for emulsification and uniform dispersion to prepare a 10% hemicellulose suspension.
A method of drying hemicellulose comprising:
taking 5g of the prepared 10% hemicellulose suspension, recording the weight of the culture dish, adding 24g of ammonium carbonate with a water-salt ratio of 1:1, uniformly mixing, putting the mixture into an 80-degree oven for drying, weighing once every hour, recording the weight, stirring the sample again to enable the state of the sample to be consistent until the weight of the sample does not continuously decrease along with the increase of time, making a curve of the change of the mass along with the time, and photographing and recording the state of the hemicellulose dried at 80 ℃.
Example 4
A method for producing hemicellulose comprising the steps of:
(hemicellulose dried at 75 ℃ in a water-salt ratio of 1: 1.2)
The chemical pulp sheet was shredded and 50g was reserved. Placing 50g of chemical pulp in an absolute dry amount into a beaker filled with 1L of sodium hydroxide solution (2.5mol/L) (the mass of the 1L of sodium hydroxide solution needs to be weighed and measured m1), starting a mechanical stirrer to uniformly disperse pulp fibers in the sodium hydroxide solution, and starting a cold alkali extraction experiment (time is 1 h); after cold alkali extraction is finished, carrying out suction filtration on the pulp suspension in a Buchner funnel (a 200-mesh nonmetal filter screen is treated by cold alkali in advance and is washed clean by deionized water) (a filter bottle is weighed in advance for calculating the mass of alkali extraction liquid), and returning and pumping the filtrate once again to remove fine fibers in the solution; closing the vacuum suction filtration pump, weighing the total weight of the filtrate and the suction filtration bottle, and deducting the mass of the suction filtration bottle to obtain the mass (m2) of the sodium hydroxide filtrate obtained by extraction; slowly pouring sodium hydroxide solution with the mass of (m1-m2) into the upper part of the pulp cake, standing for 2min, starting a vacuum filtration pump, replacing and washing the sodium hydroxide solution in the pulp pump into a vacuum filtration bottle, and weighing the total weight of the filtration bottle again to obtain the total mass m3 of the hemicellulose alkali extract.
Pouring the hemicellulose alkali extract in the filter flask into a beaker with the volume of 2L, slowly adding 2.0mol of sulfuric acid neutralizing alkali liquor (adjusting the pH value by using 0.1mol/L sulfuric acid when the pH value is reduced quickly) under the premise of electric stirring until the pH value is 2.5; washing the hemicellulose suspension with the pH value of 2.5 to the pH value of about 5.5 by continuous operations of centrifugation, deionized water addition, emulsification, centrifugation and the like; adding water to all the hemicelluloses in the centrifugal tubes for emulsification and uniform dispersion to prepare a 10% hemicellulose suspension.
A method of drying hemicellulose comprising:
taking 5g of the prepared 10% hemicellulose suspension, recording the weight of the culture dish, adding 28.8g of ammonium carbonate with a water-salt ratio of 1:1.2, uniformly mixing, putting the mixture into a 75-degree oven for drying, weighing once every hour, recording the weight, stirring the sample again to enable the state of the sample to be consistent until the weight of the sample does not continuously decrease along with the increase of time, making a curve of the change of the mass along with the time, and photographing and recording the state of the hemicellulose dried under the condition of 75 degrees, wherein the hemicellulose dried is easy to agglomerate and yellow due to overhigh water content as shown in a graph (2). This is probably because the salt does not combine sufficiently with water to form crystal water, and there is residual water between the hemicelluloses, which leads to direct association of the hemicelluloses during drying, resulting in caking and yellowing. Too much ammonium carbonate can prolong the drying time, which is not beneficial to economical production, so that the drying is carried out according to the proportion of 1:1 under the condition of 75 ℃, and the economic maximization can be achieved.
Example 5
A method for producing hemicellulose comprising the steps of:
(hemicellulose dried at 75 ℃ in a water-salt ratio of 1: 0.8)
The chemical pulp sheet was shredded and 50g was reserved. Placing 50g of chemical pulp in an absolute dry amount into a beaker filled with 1L of sodium hydroxide solution (2.5mol/L) (the mass of the 1L of sodium hydroxide solution needs to be weighed and measured m1), starting a mechanical stirrer to uniformly disperse pulp fibers in the sodium hydroxide solution, and starting a cold alkali extraction experiment (time is 1 h); after cold alkali extraction is finished, carrying out suction filtration on the pulp suspension in a Buchner funnel (a 200-mesh nonmetal filter screen is treated by cold alkali in advance and is washed clean by deionized water) (a filter bottle is weighed in advance for calculating the mass of alkali extraction liquid), and returning and pumping the filtrate once again to remove fine fibers in the solution; closing the vacuum suction filtration pump, weighing the total weight of the filtrate and the suction filtration bottle, and deducting the mass of the suction filtration bottle to obtain the mass (m2) of the sodium hydroxide filtrate obtained by extraction; slowly pouring sodium hydroxide solution with the mass of (m1-m2) into the upper part of the pulp cake, standing for 2min, starting a vacuum filtration pump, replacing and washing the sodium hydroxide solution in the pulp pump into a vacuum filtration bottle, and weighing the total weight of the filtration bottle again to obtain the total mass m3 of the hemicellulose alkali extract.
Pouring the hemicellulose alkali extract in the filter flask into a beaker with the volume of 2L, slowly adding 2.0mol of sulfuric acid neutralizing alkali liquor (adjusting the pH value by using 0.1mol/L sulfuric acid when the pH value is reduced quickly) under the premise of electric stirring until the pH value is 2.5; washing the hemicellulose suspension with the pH value of 2.5 to the pH value of about 5.5 by continuous operations of centrifugation, deionized water addition, emulsification, centrifugation and the like; adding water to all the hemicelluloses in the centrifugal tubes for emulsification and uniform dispersion to prepare a 10% hemicellulose suspension.
A method of drying hemicellulose comprising:
taking 5g of the prepared 10% hemicellulose suspension, recording the weight of the culture dish, adding 19.3g of ammonium carbonate with a water-salt ratio of 1:0.8, uniformly mixing, putting the mixture into a 75-degree oven for drying, weighing once every hour, recording the weight, stirring the sample again to enable the state of the sample to be consistent until the weight of the sample does not continuously decrease along with the increase of time, making a curve of the change of the mass along with the time, and photographing and recording the state of the hemicellulose dried under the condition of 75 degrees.
Example 6
A method for producing hemicellulose comprising the steps of:
(hemicellulose dried at 75 ℃ in a water-salt ratio of 1: 0.6.)
The chemical pulp sheet was shredded and 50g was reserved. Placing 50g of chemical pulp in an absolute dry amount into a beaker filled with 1L of sodium hydroxide solution (2.5mol/L) (the mass of the 1L of sodium hydroxide solution needs to be weighed and measured m1), starting a mechanical stirrer to uniformly disperse pulp fibers in the sodium hydroxide solution, and starting a cold alkali extraction experiment (time is 1 h); after cold alkali extraction is finished, carrying out suction filtration on the pulp suspension in a Buchner funnel (a 200-mesh nonmetal filter screen is treated by cold alkali in advance and is washed clean by deionized water) (a filter bottle is weighed in advance for calculating the mass of alkali extraction liquid), and returning and pumping the filtrate once again to remove fine fibers in the solution; closing the vacuum suction filtration pump, weighing the total weight of the filtrate and the suction filtration bottle, and deducting the mass of the suction filtration bottle to obtain the mass (m2) of the sodium hydroxide filtrate obtained by extraction; slowly pouring sodium hydroxide solution with the mass of (m1-m2) into the upper part of the pulp cake, standing for 2min, starting a vacuum filtration pump, replacing and washing the sodium hydroxide solution in the pulp pump into a vacuum filtration bottle, and weighing the total weight of the filtration bottle again to obtain the total mass m3 of the hemicellulose alkali extract.
Pouring the hemicellulose alkali extract in the filter flask into a beaker with the volume of 2L, slowly adding 2.0mol of sulfuric acid neutralizing alkali liquor (adjusting the pH value by using 0.1mol/L sulfuric acid when the pH value is reduced quickly) under the premise of electric stirring until the pH value is 2.5; washing the hemicellulose suspension with the pH value of 2.5 to the pH value of about 5.5 by continuous operations of centrifugation, deionized water addition, emulsification, centrifugation and the like; adding water to all the hemicelluloses in the centrifugal tubes for emulsification and uniform dispersion to prepare a 10% hemicellulose suspension.
A method of drying hemicellulose comprising:
taking 5g of the prepared 10% hemicellulose suspension, recording the weight of the culture dish, adding 14.4g of ammonium carbonate with a water-salt ratio of 1:0.6, uniformly mixing, putting the mixture into a 75-degree oven for drying, weighing once every hour, recording the weight, stirring the sample again to enable the state of the sample to be consistent until the weight of the sample does not continuously decrease along with the increase of time, making a curve of the change of the mass along with the time, and photographing and recording the state of the hemicellulose dried under the condition of 75 degrees.
Example 7
This example is identical to the hemicellulose production process of example 1, except that a 5% strength hemicellulose suspension is formulated.
The drying method of the hemicellulose is the same, and the difference is that 5g of the prepared 5% hemicellulose suspension is taken into a culture dish, the weight of the culture dish is recorded, 12g of ammonium carbonate with the water-salt ratio of 1:1 is added, and the mixture is uniformly mixed. The state of the hemicellulose dried out was the same as in example 1.
Example 8
This example is identical to the hemicellulose production process of example 1, except that a 15% strength hemicellulose suspension is formulated.
The drying method of the hemicellulose is the same, and the difference is that 5g of the prepared 15% hemicellulose suspension is taken in a culture dish, the weight of the culture dish is recorded, 36g of ammonium carbonate with the water-salt ratio of 1:1 is added, and the mixture is uniformly mixed. The state of the hemicellulose dried out was the same as in example 1.
Example 9
This example is the same as the hemicellulose production process of example 1. The drying method of the hemicellulose is the same, and the difference is that 5g of the prepared 10% hemicellulose suspension is taken in a culture dish, the weight of the culture dish is recorded, 28.5g of ammonium carbonate with the water-salt ratio of 1:1 is added, and the mixture is uniformly mixed. The state of the hemicellulose dried out was the same as in example 1.
Experimental data
1. Specific data for initial weight change over time at different temperatures for ammonium carbonate and hemicellulose mixed at a mass ratio of 48:1
The time profile of the hemicellulose dried at different temperatures is shown in figure 1.
It is clearly observed that after a temperature of 80 ℃ has been reached, the drying time is greatly reduced, but a flaky, yellowish-colored hemicellulose sample appears. Probably because of the deterioration of hemicellulose due to high temperature. Combined with the drying time and analysis of the dried out sample, it is most economical to dry the hemicellulose at 75 ℃.
2. Specific data for the initial weight of different mixing ratios of ammonium carbonate and hemicellulose at 75 ℃ over time
It can be seen from fig. 2 and table 2 that the hemicellulose sample dried at a brine ratio of ammonium carbonate of 1.2:1 was similar to the hemicellulose sample dried at 1:1, flocculent and finer, whereas the hemicellulose sample was yellowed, caked and dried without significant reduction in drying time at a brine ratio of 0.6: 1.
The mass ratio of ammonium carbonate and semi-fiber has certain influence on the drying effect, and the reasonable mass ratio range is as follows: 1:48-1:57. Combining the drying time and the analysis of the dried sample, it is most economical when the ammonium carbonate is in water-salt ratio of 1:1 and the mass ratio is 1: 48.
3. According to the water-salt ratio of ammonium carbonate to hemicellulose of 1:1 hemicellulose samples dried at different temperatures and different drying ratios at 75 degrees are shown in FIG. 3
As can be seen from FIG. 3, it is most economical when the water to salt ratio of ammonium carbonate is 1:1 and the drying temperature is 75 ℃.
The performance of the dry hemicellulose prepared by the method is better than that of the hemicellulose obtained under the natural air drying condition, is close to that of the hemicellulose obtained under the cold drying condition, has the advantages of cost saving, recoverable reagent, environmental friendliness, no pollution and the like, and is suitable for large-scale production of enterprises.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (4)
1. The drying method of the hemicellulose is characterized in that the hemicellulose is obtained by mixing a hemicellulose suspension liquid with pH of 5-6 and water content of 5-15% with ammonium carbonate and then drying the mixture;
the drying temperature is 60-75 ℃;
stirring in the drying process;
the ammonium carbonate is selected from ammonium carbonate with a water-salt ratio of 1: 0.8-1.2;
the mass ratio of the hemicellulose to the ammonium carbonate is 1:48-1: 57.
2. The method for drying hemicellulose according to claim 1, wherein the mass ratio of hemicellulose to ammonium carbonate is 1: 48.
3. A method for producing hemicellulose by using the drying method according to any one of claims 1 to 2, comprising the steps of:
step a, extracting hemicellulose by adopting cold alkali extraction, neutralizing with sulfuric acid, and centrifugally washing to obtain a hemicellulose suspension with pH of 5-6 and water content of 5-15%;
and b, mixing the hemicellulose suspension with ammonium carbonate by using the drying method of any one of claims 1-2, and drying to obtain the hemicellulose.
4. The hemicellulose production method according to claim 3, wherein the step a comprises:
placing the chemical pulp into a beaker filled with a sodium hydroxide solution, starting a mechanical stirrer to uniformly disperse the chemical pulp in the sodium hydroxide solution, and starting cold caustic extraction;
after the cold alkali extraction is finished, carrying out suction filtration on the chemical pulp suspension in a Buchner funnel, and returning suction filtration liquid to remove fine fibers in the solution;
pouring the hemicellulose alkali extract in the filter flask into a beaker, and slowly adding sulfuric acid to neutralize the alkali liquor under the condition of electric stirring until the pH value is 2-3;
washing the hemicellulose turbid liquid with the pH value of 2-3 to the pH value of 5-6 by continuous operations of centrifugation, deionized water addition, emulsification and centrifugation;
adding water to all the hemicellulose in all the centrifugal tubes for emulsification and uniform dispersion to prepare a hemicellulose suspension with the concentration of 5-15%.
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Citations (5)
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| US10787766B2 (en) * | 2018-04-04 | 2020-09-29 | Inventure Renewables, Inc. | Methods for the production of pulp and hemicellulose |
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| CN102936297A (en) * | 2012-11-15 | 2013-02-20 | 广西大学 | Porous chitosan metal porphyrin composite and preparation method and application thereof |
| KR20150093483A (en) * | 2014-02-07 | 2015-08-18 | 한국과학기술원 | Methods for Pretreating Lignocellulosic Biomass |
| CN105745377B (en) * | 2014-06-27 | 2019-07-30 | 因温特国际有限公司 | The method for producing high alpha-cellulose paper pulp |
| CN106119295A (en) * | 2016-08-30 | 2016-11-16 | 河南农业大学 | Method for pretreating corn stalks with NH4HCO3 and method for anaerobic fermentation of corn stalks |
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