CN106555015B - Pretreatment method for preparing xylose from bagasse - Google Patents
Pretreatment method for preparing xylose from bagasse Download PDFInfo
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- C13—SUGAR INDUSTRY
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- C13K13/002—Xylose
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Abstract
A pretreatment method for preparing xylose by using bagasse comprises the following process steps: (1) clear water is injected into the No. 1 cleaning pool, the No. 2 cleaning pool and the No. 3 cleaning pool; putting bagasse of a sugar mill into a No. 1 cleaning pool, a No. 2 cleaning pool and a No. 3 cleaning pool in sequence, soaking, stirring, washing for 10min, and then fishing out for dehydration; (2) soaking the bagasse subjected to washing and dewatering for three times in a phosphoric acid solution with the mass concentration of 0.5-3% for 1-6 hours, and dewatering; (3) soaking the bagasse soaked by the phosphoric acid solution in the 2-stage clear water in the step (1), stirring and washing for 10 min; then dehydrating to ensure that the water content of the bagasse is less than or equal to 70 percent; (4) putting bagasse into a reaction kettle for steam explosion, and collecting the steam exploded bagasse; namely, the pretreatment of the bagasse is completed. The method of the invention can lower the cost of the bagasse for preparing xylose and simultaneously solve the problem of environmental pollution of waste acid in the production process.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of byproducts in the sugarcane sugar industry, in particular to a pretreatment method for preparing xylose by using bagasse.
Background
Bagasse is a main byproduct in the sugar industry of sugarcane, is fibrous residue of cane stems after mechanical crushing and juice extraction of sugarcane, belongs to agricultural solid waste, and is a renewable resource. According to statistics of national statistical bureau, the planting area of the third sugarcane in the world of brazil and india in 2009 is 1555 ten thousand mu, the yield of cane sugar is 700 million tons, and the yield of the cane sugar is 2 tons per 1 ton of sugar, and the yield of the cane sugar in each sugar factory in the whole area of Guangxi is 1400 million tons. The bagasse comprises 32-48% of cellulose, 19-32% of hemicellulose, 23-32% of lignin and 4% of ash, and most of the bagasse is directly used as boiler fuel to be burnt except for part of bagasse used for papermaking, artificial board manufacturing, active carbon, dietary fiber, biodiesel and ethanol, and is not fully utilized, so that the environment is polluted; secondly, the resource is wasted. How to scientifically and efficiently utilize the bagasse resources, the secondary utilization of the sugarcane is realized, the economic benefit of a sugar refinery is improved, and the method has great social and economic benefits.
Xylose is an intermediate product in the production process of xylitol, belongs to five-carbon sugar and has 4 para-optical isomers. At present, xylose in a free state is not found in nature except for bamboo shoots, but is widely present in hemicellulose of natural plants in a condensed state, i.e., contained in plant bodies in the form of macromolecular xylan. The pentosan content in the bagasse is about 24 percent, and the bagasse xylose product has higher purity than the corn cob xylose product, is more competitive in the market and is one of more ideal xylose raw materials because of concentration and low cost.
The existing xylose production technology adopts sulfuric acid as an acid hydrolysis agent to generate a large amount of SO with high concentration4 2-The xylose production wastewater is difficult to remove by a biochemical method, so that the sewage treatment cost of xylose production enterprises is increased, the treatment cost accounts for 10% of the product selling price, and the economic benefit of the enterprises is seriously influenced. Enterprises try to use hydrochloric acid as an acid hydrolysis agent, but the volatility and corrosiveness of the hydrochloric acid cause large investment in primary equipment and bring about equipment corrosion problems, so that the risk of safe production is increased.
How to reduce the production cost of xylose prepared by using bagasse, solve the problem of environmental pollution of waste acid in the production process, realize clean production, improve the market competitiveness of products and be the target pursued in the industry.
Disclosure of Invention
The invention aims to provide a pretreatment method for preparing xylose by using bagasse, which can lower the cost of preparing xylose by using the bagasse and solve the problem of environmental pollution of waste acid in the production process.
The technical scheme adopted by the invention is as follows:
a pretreatment method for preparing xylose by using bagasse comprises the following process steps:
(1) stacking bagasse in a bagasse storage yard for more than 3 months for later use; preparing three cleaning pools, namely a No. 1 cleaning pool, a No. 2 cleaning pool and a No. 3 cleaning pool, and injecting clear water; putting bagasse of a sugar mill into a No. 1 cleaning pool, soaking, stirring and washing for 10 min; dewatering bagasse, soaking in No. 2 washing tank, stirring and washing for 10 min; dewatering bagasse, soaking in No. 3 cleaning pool, stirring and washing for 10 min; dehydrating until the water content of the bagasse is less than or equal to 65 percent; in the cleaning process, the weight ratio of the bagasse to the clear water is 1 (5-20). The clear water in the No. 1 cleaning pool is replaced by new clear water after 4-7 times of bagasse cleaning; the clear water in the No. 2 cleaning pool is replaced by new clear water after 5-8 times of bagasse cleaning; the clear water in the No. 3 cleaning pool is replaced by new clear water after 6-9 times of bagasse cleaning; when the No. 1 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 2 cleaning tank-No. 3 cleaning tank-No. 1 cleaning tank; when the No. 2 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 3 cleaning tank-No. 1 cleaning tank-No. 2 cleaning tank; when the No. 3 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 1 cleaning tank-No. 2 cleaning tank-No. 3 cleaning tank; and circulating in sequence.
(2) Soaking bagasse subjected to three-time washing and dehydration in a phosphoric acid solution with the mass concentration of 0.5-3% for 1-6 hours, and dehydrating to enable the moisture content of the bagasse to be less than or equal to 65%; the weight ratio of the bagasse to the 1.5% phosphoric acid solution is 1 (4-10). The 2-stage clean water is the clean water discharged in the second cleaning tank in the cleaning process of the bagasse cleaning tank.
(3) Soaking the bagasse soaked by the phosphoric acid solution in the 2-stage clear water in the step (1), stirring and washing for 10 min; fishing out bagasse and dehydrating to ensure that the water content of the bagasse is less than or equal to 70 percent; the weight ratio of the bagasse to the clear water is 1: 10.
(4) Putting bagasse in a reaction kettle under a steam explosion platform for steam explosion, wherein the steam pressure is 0.4-2.0 MPa; maintaining the pressure for 4 min or more, releasing the pressure, and collecting the steam exploded bagasse; namely, the pretreatment of the bagasse is completed.
The above-mentioned dehydration is centrifugal dehydration using a centrifuge or filter-press dehydration using a filter press.
The steam explosion pretreatment is a pretreatment method which is developed rapidly in recent years and is mainly applied to the pretreatment fields of sugar making, building materials and lignocellulose raw materials, food production and feed processing. The steam explosion is mainly to treat the fiber raw material by high-temperature and high-pressure steam and realize the component separation and the structural change of the raw material through the process of instant pressure release. Cellulose and hemicellulose in plant cells are bonded by lignin, under the action of high-temperature and high-pressure steam, the crystallinity of the cellulose is improved, the polymerization degree is reduced, the hemicellulose is partially degraded, the lignin is softened, the transverse connection strength is reduced, when the pressure of a material filled with pressure steam is suddenly released, water vapor in pores is rapidly expanded to generate a blasting effect, the lignin can be partially stripped, and the raw material is torn into fine fibers. The existing xylose production technology adopts sulfuric acid as an acid hydrolysis agent to generate a large amount of SO with high concentration4 2-The xylose production wastewater is difficult to remove by a biochemical method, so that the sewage treatment cost of xylose production enterprises is increased, the treatment cost accounts for 10% of the product selling price, and the economic benefit of the enterprises is seriously influenced. Enterprises try to use hydrochloric acid as an acid hydrolysis agent, but the volatility and corrosiveness of the hydrochloric acid cause large investment in primary equipment and bring about equipment corrosion problems, so that the risk of safe production is increased. The invention uses medium strong acid-phosphoric acid to replace strong acid-sulfuric acid and hydrochloric acid, adopts a technical method combining reverse rinsing, phosphoric acid infiltration and steam explosion to pretreat bagasse for preparing xylose, the yield of the xylose can reach the yield of the current industrial production of xylose, and simultaneously solves the problem of high concentration SO4 2-Environmental disposal of spent acid and corrosion of equipment.
The technical principle of the invention is as follows: firstly, bagasse is softened by a reverse rinsing technology, and impurities such as silt, inorganic salt, microbial spores and the like carried by the raw bagasse are removed, so that difficulty in the subsequent hydrolysate purification process is avoided. Secondly, the phosphoric acid soaks the bagasse can remove acid water-soluble impurities in the bagasse, and the fiber is swelled to a certain extent, so that the infiltration degree of saturated steam is increased, the hydration is greatly increased, and the treatment effect is improved; simultaneously, the fiber is softened, which is beneficial to the separation of the fiber without mechanical damage during blasting. The bagasse can be instantly sprayed and exploded and expanded under the conditions of high temperature and high pressure by steam spraying and explosion treatment, so that the compact structures of cellulose, hemicellulose and lignin are loosened, fibrous tissues are exposed, a hydrolysis catalyst can easily contact with an action point, and the reaction condition is milder than that before the bagasse is expanded, so that the efficient hydrolysis of the hemicellulose by using other catalysts such as phosphoric acid is possible. The invention adopts phosphoric acid to carry out infiltration pretreatment and reverse rinsing on bagasse, removes impurities of raw bagasse as much as possible and provides H+The subsequent steam explosion efficiency is improved; puffing bagasse by using a steam explosion technology to puff and loosen cellulose, hemicellulose and lignin in the bagasse so as to facilitate hydrolysis reaction; the hydrolysis method adopts medium strong acid phosphoric acid as a catalyst instead of sulfuric acid and hydrochloric acid, can obviously reduce pollution treatment cost of enterprises, and meanwhile, the yield of xylose products is kept level in the existing xylose industrial production. Compared with the existing xylose production process, the method has the advantages of lower production cost, solving the environmental protection problem of waste acid in the production process, realizing clean production and improving the market competitiveness of the product.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes the technical solutions of the present invention clearly and completely in combination with the embodiments of the present invention.
Example 1
The pretreatment method for preparing xylose by using bagasse comprises the following process steps:
(1) preparing three cleaning pools, namely a No. 1 cleaning pool, a No. 2 cleaning pool and a No. 3 cleaning pool, and injecting clear water; putting bagasse of a sugar mill into a No. 1 cleaning pool, soaking, stirring and washing for 10 min; dewatering bagasse, soaking in No. 2 washing tank, stirring and washing for 10 min; dewatering bagasse, soaking in No. 3 cleaning pool, stirring and washing for 10 min; dehydrating until the water content of the bagasse is less than or equal to 65 percent; in the cleaning process, the weight ratio of the bagasse to the clear water is 1: 5. The clear water in the No. 1 cleaning pool is replaced by new clear water after 4-7 times of bagasse cleaning; the clear water in the No. 2 cleaning pool is replaced by new clear water after 5-8 times of bagasse cleaning; the clear water in the No. 3 cleaning pool is replaced by new clear water after 6-9 times of bagasse cleaning; when the No. 1 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 2 cleaning tank-No. 3 cleaning tank-No. 1 cleaning tank; when the No. 2 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 3 cleaning tank-No. 1 cleaning tank-No. 2 cleaning tank; when the No. 3 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 1 cleaning tank-No. 2 cleaning tank-No. 3 cleaning tank; and circulating in sequence.
(2) Soaking bagasse subjected to three-time washing and dehydration in a phosphoric acid solution with the mass concentration of 0.5-3% for 1-6 hours, and dehydrating to enable the moisture content of the bagasse to be less than or equal to 65%; the weight ratio of bagasse to 1.5% phosphoric acid solution was 1: 4.
(3) Soaking the bagasse soaked by the phosphoric acid solution in the 2-stage clear water in the step (1), stirring and washing for 10 min; fishing out bagasse and dehydrating to ensure that the water content of the bagasse is less than or equal to 70 percent; the weight ratio of the bagasse to the clear water during washing is 1: 10.
(4) Putting bagasse in a reaction kettle under a steam explosion platform for steam explosion, wherein the steam pressure is 0.4-2.0 MPa; maintaining the pressure for 4 min or more, releasing the pressure, and collecting the steam exploded bagasse; namely, the pretreatment of the bagasse is completed.
The bagasse is stacked in a bagasse storage yard for more than 3 months.
The dehydration is centrifugal dehydration by using a centrifugal machine or filter pressing dehydration by using a filter press.
Example 2
The pretreatment method for preparing xylose by using bagasse comprises the following process steps:
(1) preparing three cleaning pools, namely a No. 1 cleaning pool, a No. 2 cleaning pool and a No. 3 cleaning pool, and injecting clear water; putting bagasse of a sugar mill into a No. 1 cleaning pool, soaking, stirring and washing for 10 min; dewatering bagasse, soaking in No. 2 washing tank, stirring and washing for 10 min; dewatering bagasse, soaking in No. 3 cleaning pool, stirring and washing for 10 min; dehydrating until the water content of the bagasse is less than or equal to 65 percent; in the cleaning process, the weight ratio of the bagasse to the clear water is 1: 10. The clear water in the No. 1 cleaning pool is replaced by new clear water after 4-7 times of bagasse cleaning; the clear water in the No. 2 cleaning pool is replaced by new clear water after 5-8 times of bagasse cleaning; the clear water in the No. 3 cleaning pool is replaced by new clear water after 6-9 times of bagasse cleaning; when the No. 1 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 2 cleaning tank-No. 3 cleaning tank-No. 1 cleaning tank; when the No. 2 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 3 cleaning tank-No. 1 cleaning tank-No. 2 cleaning tank; when the No. 3 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 1 cleaning tank-No. 2 cleaning tank-No. 3 cleaning tank; and circulating in sequence.
(2) Soaking bagasse subjected to three-time washing and dehydration in a phosphoric acid solution with the mass concentration of 0.5-3% for 1-6 hours, and dehydrating to enable the moisture content of the bagasse to be less than or equal to 65%; the weight ratio of bagasse to 1.5% phosphoric acid solution was 1: 6.
(3) Soaking the bagasse soaked by the phosphoric acid solution in the 2-stage clear water in the step (1), stirring and washing for 10 min; fishing out bagasse and dehydrating to ensure that the water content of the bagasse is less than or equal to 70 percent; the weight ratio of the bagasse to the clear water during washing is 1: 10.
(4) Putting bagasse in a reaction kettle under a steam explosion platform for steam explosion, wherein the steam pressure is 0.4-2.0 MPa; maintaining the pressure for 4 min or more, releasing the pressure, and collecting the steam exploded bagasse; namely, the pretreatment of the bagasse is completed.
The bagasse is stacked in a bagasse storage yard for more than 3 months.
The dehydration is centrifugal dehydration by using a centrifugal machine or filter pressing dehydration by using a filter press.
Example 3
The pretreatment method for preparing xylose by using bagasse comprises the following process steps:
(1) preparing three cleaning pools, namely a No. 1 cleaning pool, a No. 2 cleaning pool and a No. 3 cleaning pool, and injecting clear water; putting bagasse of a sugar mill into a No. 1 cleaning pool, soaking, stirring and washing for 10 min; dewatering bagasse, soaking in No. 2 washing tank, stirring and washing for 10 min; dewatering bagasse, soaking in No. 3 cleaning pool, stirring and washing for 10 min; dehydrating until the water content of the bagasse is less than or equal to 65 percent; in the cleaning process, the weight ratio of the bagasse to the clear water is 1: 20. The clear water in the No. 1 cleaning pool is replaced by new clear water after 4-7 times of bagasse cleaning; the clear water in the No. 2 cleaning pool is replaced by new clear water after 5-8 times of bagasse cleaning; the clear water in the No. 3 cleaning pool is replaced by new clear water after 6-9 times of bagasse cleaning; when the No. 1 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 2 cleaning tank-No. 3 cleaning tank-No. 1 cleaning tank; when the No. 2 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 3 cleaning tank-No. 1 cleaning tank-No. 2 cleaning tank; when the No. 3 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 1 cleaning tank-No. 2 cleaning tank-No. 3 cleaning tank; and circulating in sequence.
(2) Soaking bagasse subjected to three-time washing and dehydration in a phosphoric acid solution with the mass concentration of 0.5-3% for 1-6 hours, and dehydrating to enable the moisture content of the bagasse to be less than or equal to 65%; the weight ratio of bagasse to 1.5% phosphoric acid solution was 1: 10.
(3) Soaking the bagasse soaked by the phosphoric acid solution in the 2-stage clear water in the step (1), stirring and washing for 10 min; fishing out bagasse and dehydrating to ensure that the water content of the bagasse is less than or equal to 70 percent; the weight ratio of the bagasse to the clear water during washing is 1: 10.
(4) Putting bagasse in a reaction kettle under a steam explosion platform for steam explosion, wherein the steam pressure is 0.4-2.0 MPa; maintaining the pressure for 4 min or more, releasing the pressure, and collecting the steam exploded bagasse; namely, the pretreatment of the bagasse is completed.
The bagasse is stacked in a bagasse storage yard for more than 3 months.
The dehydration is centrifugal dehydration by using a centrifugal machine or filter pressing dehydration by using a filter press.
The above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.
Claims (2)
1. A pretreatment method for preparing xylose by using bagasse is characterized in that: the pretreatment steps are as follows:
(1) stacking bagasse in a bagasse storage yard for more than 3 months for later use; preparing three cleaning pools, namely a No. 1 cleaning pool, a No. 2 cleaning pool and a No. 3 cleaning pool, and injecting clear water; putting bagasse of a sugar mill into a No. 1 cleaning pool, soaking, stirring and washing for 10 min; dewatering bagasse, soaking in No. 2 washing tank, stirring and washing for 10 min; dewatering bagasse, soaking in No. 3 cleaning pool, stirring and washing for 10 min; dehydrating until the water content of the bagasse is less than or equal to 65 percent; in the cleaning process, the weight ratio of the bagasse to clear water is 1 (5-20); the clear water in the No. 1 cleaning pool is replaced by new clear water after 4-7 times of bagasse cleaning; the clear water in the No. 2 cleaning pool is replaced by new clear water after 5-8 times of bagasse cleaning; the clear water in the No. 3 cleaning pool is replaced by new clear water after 6-9 times of bagasse cleaning; when the No. 1 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 2 cleaning tank-No. 3 cleaning tank-No. 1 cleaning tank; when the No. 2 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 3 cleaning tank-No. 1 cleaning tank-No. 2 cleaning tank; when the No. 3 cleaning tank is replaced by new clear water, the bagasse cleaning flow in the cleaning tank is No. 1 cleaning tank-No. 2 cleaning tank-No. 3 cleaning tank; circulating in sequence; rinsing to soften the bagasse and remove the silt, inorganic salt and impurities of microbial spores carried by the raw bagasse so as to avoid causing difficulty in the subsequent hydrolysate purification process;
(2) soaking bagasse subjected to three-time washing and dehydration in a phosphoric acid solution with the mass concentration of 0.5-3% for 1-6 hours, and dehydrating to enable the moisture content of the bagasse to be less than or equal to 65%; the weight ratio of the bagasse to 1.5% phosphoric acid solution is 1 (4-10); the phosphoric acid soaks the bagasse to remove acidic water-soluble impurities in the bagasse, and the fiber is swelled to a certain extent, so that the infiltration degree of saturated steam is increased, the hydration is increased, and the treatment effect is improved; simultaneously, the fiber is softened, so that the fiber is separated under the condition of no mechanical damage during blasting;
(3) soaking the bagasse soaked by the phosphoric acid solution in the 2-stage clear water in the step (1), stirring and washing for 10 min; fishing out bagasse and dehydrating to ensure that the water content of the bagasse is less than or equal to 70 percent; the weight ratio of the bagasse to clear water is 1:10 during washing; the 2-stage clear water is clear water discharged in a second cleaning tank in the cleaning process of the cleaning tank; the bagasse is soaked and pretreated by phosphoric acid and then is rinsed in a reverse direction, impurities of the raw bagasse are removed as much as possible, and H is provided+The subsequent steam explosion efficiency is improved;
(4) putting bagasse in a reaction kettle under a steam explosion platform for steam explosion, wherein the steam pressure is 0.4-2.0 MPa; maintaining the pressure for 4 min or more, releasing the pressure, and collecting the steam exploded bagasse; namely, the pretreatment of the bagasse is completed.
2. A pretreatment process for the preparation of xylose from bagasse, according to claim 1, characterized by the fact that: the dehydration is centrifugal dehydration by using a centrifugal machine or filter pressing dehydration by using a filter press.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134616A (en) * | 2011-01-28 | 2011-07-27 | 中国科学院过程工程研究所 | Method for fully utilizing biobased products prepared by semicellulose of straws as well as components thereof |
| CN102206691A (en) * | 2011-03-26 | 2011-10-05 | 北海田野食品有限公司 | Method for producing xylose oligomer from bagasse |
| CN102268490A (en) * | 2011-06-16 | 2011-12-07 | 北京化工大学 | Clean technique for co-producing xylose, xylitol and arabinose from agricultural and forestal waste |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134616A (en) * | 2011-01-28 | 2011-07-27 | 中国科学院过程工程研究所 | Method for fully utilizing biobased products prepared by semicellulose of straws as well as components thereof |
| CN102206691A (en) * | 2011-03-26 | 2011-10-05 | 北海田野食品有限公司 | Method for producing xylose oligomer from bagasse |
| CN102268490A (en) * | 2011-06-16 | 2011-12-07 | 北京化工大学 | Clean technique for co-producing xylose, xylitol and arabinose from agricultural and forestal waste |
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