CN208815036U - A kind of device extracting xylose from viscose fiber waste material - Google Patents

Abstract

The utility model belongs to changing rejected material to useful resource and technical field of xylose production, and in particular to a kind of device that xylose is extracted from viscose fiber waste material；The device includes sequentially connected tank of sizing mixing, hydrolyzer, neutralizing tank, bleacher, level-one cation exchange column, level-one anion-exchange column, second level cation exchange column, second level anion-exchange column, a concentration evaporator, decolorizing column, secondary concentration evaporator, crystallizing tank and centrifuge；Viscose fiber production waste material import and diluted acid water inlet are offered on tank sizing mixing, it is connected with steam on hydrolyzer and enters pipeline, precipitated calcium carbonate import is offered on neutralizing tank, active carbon import is offered on bleacher, a concentration evaporator and secondary concentration evaporator are cold boiler；The apparatus structure is simple, easy to operate, can be realized viscose fiber waste material rapidly and efficiently be converted into xylose.

Description

A kind of device extracting xylose from viscose fiber waste material

Technical field

The utility model belongs to changing rejected material to useful resource and technical field of xylose production, and in particular to a kind of useless from viscose fiber The device of xylose is extracted in material.

Background technique

Xylose is a kind of reproducibility carbohydrate, molecular formula C5H10O5.Xylose sugariness is the 72% of sucrose, with glucose sweet tea Degree is close, can improve the flavor and taste of sweet food, inhibits peculiar smell.Xylose can be hydrogenated reduction in the presence of a catalyst and generate Xylitol can be used as the raw material of xylitol, and xylose has good food compatibility, can hold with during amino acid Hybrid Heating It is also easy to produce Maillard reaction, plays the effect of flavouring.Xylose also has a good heath-function, can be in activating human body enteron aisle Bifidobacterium simultaneously promotes to grow, and improves the micro-ecological environment of human body, improves the immunocompetence of body.Xylose is a kind of important change Work raw material, it is industrial to produce xylitol, fodder yeast and suffered from fields such as video, medicine, chemical industry, leather, fuel Extensive purposes.

Annual agriculture and forestry production can all generate waste material largely containing hemicellulose, the wood obtained using hydrolysis of hemicellulose Sugar, not only with good economic efficiency, there are also important environment protection significances.With the chemical pulp (plants such as wood pulp, cotton paddle, straw pulp Cellulose) it is during raw material produces viscose fiber, carrying out processing to cellulose using lye is manufacture viscose fiber first Step.Hemicellulose concentration is high, extremely disadvantageous influence is generated to viscose fiber production technology and Quality Cost, it is therefore necessary to soak Hemicellulose is dissolved out with lye in stain technique, high-intensitive cellulose could be obtained, so can generate in above process big The high concentration alkali pressed liquor rich in hemicellulose of amount.Main component in alkali pressed liquor is sodium hydroxide and hemicellulose.It is existing It is directed to the spent lye in enterprise, it is after the effective component alkali in spent lye point and salinity recycling, remaining substance is dry, it is sold to Down-stream enterprise's processing.

201210104647.X, it is entitled " a kind of to prepare xylose using squeezing spent lye in viscose fiber production process Technical solution disclosed in method ", the program pass through film filtering preparation half directly against spent lye is generated in viscose fiber production Cellulose solution, the extraction of hemicellulose, the hydrolysis of hemicellulose, neutralize depickling, pre-concentration, decoloration, ion exchange and often Rule crystallization, separation, drying process obtain xylose product.The direct raw material of this method is the squeezing salkali waste containing alkali and hemicellulose Liquid, and the concentrated sulfuric acid that added raw material in the treatment process of lignin is 98.5%, 95% industrial alcohol, in whole process Cost is very high, causes the technology can not utilization and extention.

Disclosing in 201410622101.2 in the prior art a kind of using viscose fiber pressed liquor is raw material production xylose The film concentration technology of alcohol, the program in hemicellulose liquid charging stock, contain directly against spent lye is generated in viscose fiber production There are a large amount of salkali waste, salt, needs to be neutralized with a large amount of acid, in hydrolyzed hemicellulose, PH is controlled 0, and hydrolytic acidity is higher, after Continuous processing and filter process are high to the corrosion-resistant intensity requirement of equipment, and the acid pickle generated is more, obtained xylitol it is pure Spend relatively low, raw material investment and equipment investment are big, and overall cost is high, and economic benefit is lower.

Utility model content

Place in view of the deficiency of the prior art, the purpose of this utility model, which is that, provides one kind from viscose fibre The device of xylose is extracted in dimension waste material, the program is by the recovered alkali of the spent lye of viscose fiber point and salinity and to do for raw material Solid-state viscose fiber waste material after dry.Ash content is low in the solid-state viscose fiber waste material, and main component is hemicellulose, this is practical new A kind of device extracting xylose from viscose fiber waste material provided by type, structure is simple, mild condition, it is low for equipment requirements, The wastewater flow rate that the xylose rate of recovery is high, generates is few, has extensive promotional value.

The utility model achieves the above object through the following technical schemes:

The utility model discloses a kind of from viscose fiber waste material extracts the device of xylose, which includes being sequentially connected Tank of sizing mixing, hydrolyzer, neutralizing tank, bleacher, level-one cation exchange column, level-one anion-exchange column, second level cation hand over Change column, second level anion-exchange column, a concentration evaporator, decolorizing column, secondary concentration evaporator, crystallizing tank and centrifuge；? It sizes mixing and offers viscose fiber production waste material import and diluted acid water inlet on tank, be connected with steam on hydrolyzer and enter pipeline, Precipitated calcium carbonate import is offered on neutralizing tank, and active carbon import, a concentration evaporator and two are offered on bleacher Secondary concentration evaporator is cold boiler；The connection relationship of each section be size mixing tank outlet by pipeline and hydrolyzer Import is connected, and material is connected by pipeline with the import of neutralizing tank after filter filters in hydrolyzer, and material passes through in neutralizing tank It is connected by pipeline with the import of bleacher after filter filtering, material passes through pipeline and one after filter filters in bleacher The import of grade cation exchange column is connected, the outlet of level-one cation exchange column by pipeline and level-one anion-exchange column into Mouth is connected, and the outlet of level-one anion-exchange column is connected by pipeline with the import of second level cation exchange column, second level cation The outlet of exchange column is connected by pipeline with the import of second level anion-exchange column, and the outlet of second level anion-exchange column passes through pipe Road is connected with the import of a concentration evaporator, and the outlet of a concentration evaporator is connected by pipeline with decolorizing column import, takes off The outlet of color column is connected by pipeline with the import of secondary concentration evaporator, and the outlet of secondary concentration evaporator passes through pipeline and knot The import of brilliant tank is connected, and the outlet of crystallizing tank is connected with the import of centrifuge.

Preferably, above-mentioned a kind of device that xylose is extracted from viscose fiber waste material, the tank of sizing mixing, neutralizing tank and Bleacher is provided with agitating paddle and stirring motor.

Preferably, above-mentioned a kind of device that xylose is extracted from viscose fiber waste material, is externally connected with circulation in hydrolyzer Pump, recycle pump circulation makes material extract out and be sent into from hydrolyzer.

Preferably, above-mentioned a kind of device that xylose is extracted from viscose fiber waste material is opened at the top of the hydrolyzer Equipped with steam (vapor) outlet, which passes through the steam inlet of pipeline and a concentration evaporator and/or secondary concentration evaporator It is connected.

A method of it extracting xylose from viscose fiber waste material, includes the following steps:

Step (1) is sized mixing

Dilute sulfuric acid is added in the tank of sizing mixing (1), then solid-state viscose fiber waste material is slowly added to size mixing in tank, constantly stirs Mixing is uniformly mixed it with dilute sulfuric acid, solid waste in tank of sizing mixing: sulfuric acid: the mass ratio of water is 15:3:82；

Step (2) hydrolysis

The slurries that step is obtained are through being constantly passed through steam heat temperature raising, water in circulating pump injection hydrolyzer in hydrolyzer It solves temperature in pot to control at 110 ± 5 DEG C, pressure control is controlled at 2 hours, hydrolyzed in 0.08MPa, hydrolysis time in hydrolyzer Starting circulating pump makes to extract out and be sent into the slave hydrolyzer of serum recycle in the process；

Step (3) neutralizes

Feed liquid after step (2) hydrolysis is sent into neutralizing tank after filtering, and precipitated calcium carbonate is added into neutralizing tank, PH in neutralizing tank is controlled in 3-5, in neutralizing tank, is persistently stirred after charging 30 minutes, stood after stopping stirring until Calcium sulfate sufficiently precipitates in feed liquid, and time of repose was controlled at >=30 minutes, filters after standing, filtrate goes to step (4)；

Step (4) is once decolourized

Feed liquid after step (3) are neutralized is sent into bleacher after filtering decolourizes, and decolorising agent is active carbon, active carbon Additional amount is 40 ± 10kg/10m³Neutralizer, bleaching temperature control are being greater than 60 DEG C, and bleaching time is not less than 30 minutes；Decoloration It is filtered by flame filter press, the light transmittance of filtrate is greater than 45% after filtering；

Step (5) positive and negative ion exchange

Filtrate after step (4) decolorization filtering is successively passed through into level-one cation exchange column, level-one anion-exchange column, two Grade cation exchange column, second level anion-exchange column, the light transmittance of filtrate is greater than 90% after positive and negative ion exchange, the pH of filtrate Value >=3.5；

Step (6) flush distillation concentration

Filtrate after step (5) positive and negative ion exchange is subjected to first time vacuum evaporation, the folding of concentrate after concentration Light value is controlled in 45-55%；

Step (7) secondary decolourization

Step (6) resulting concentrate is decolourized, the light transmittance > 80% of concentrate, pH >=5 after decoloration；Decoloration Agent is granulated carbon；

The concentration of step (8) double evaporation-cooling

Concentrate after step (7) resulting decoloration is subjected to second of vacuum evaporation, after second is concentrated by evaporation, The refractive power value of concentrate is controlled 78~85%；The Steam pressure control of double evaporation-cooling concentration is in 0.02-0.15MPa, inlet amount Control is controlled in 2.0~4.5m3, vacuum degree >=0.07MPa, evaporating temperature at 80-95 DEG C；

Step (9) crystallization, centrifuge separation

Step (8) resulting material is subjected to crystallization operation, the initial temperature of crystallization controls at 60 DEG C, cools down 1 DEG C per hour, Until room temperature blowing, is xylose by the material centrifuge separation gained solid phase after crystallization.

Preferably, a kind of above-mentioned method that xylose is extracted from viscose fiber waste material, in step (3), in filter process Middle addition filter aid perlite.

Preferably, a kind of above-mentioned method that xylose is extracted from viscose fiber waste material, in step (5), level-one cation Exchange: after exchange, mineral acid content > 0.1-1% in solution, the light transmission value > 60% of solution；Level-one anion exchange: exchange Afterwards, the pH of solution is controlled in 3.0-6, the light transmission value > 70% of solution；The exchange of second level cation: after exchange, inorganic acid in solution Content > 0.01-0.1%, the light transmission value > 80% of solution；Second level anion exchange: exchanging conductivity≤200us/cm of liquid, After exchange, the pH of solution is controlled in 3-6, the light transmission value > 90% of solution.

Preferably, a kind of above-mentioned method that xylose is extracted from viscose fiber waste material, in step (2), half fiber after hydrolysis Dimension hplc is greater than or equal to 150g/l.

Preferably, a kind of above-mentioned method that xylose is extracted from viscose fiber waste material, in step (2), when hydrolysis, is controlled Sulfuric acid content in hydrolyzer (2) is 3%.

A kind of preparation method of xylitol is restored by above-mentioned xylose hydrogenation, obtains xylitol.

Compared with prior art, a kind of device extracting xylose from viscose fiber waste material described in the utility model, With following innovative point:

(1) it is that the solid-state by the recovered alkali of the spent lye of viscose fiber point and salinity and after drying sticks that the program, which is directed to raw material, Glue fiber waste material.Alkali part and salinity have already passed through UF membrane recycling in the solid-state viscose fiber waste material, and ash content is very low, this The kind pervious processing mode of waste material is as fuel combustion, and as using energy source, the economic value of generation is less, the hair of the application The solid waste sized mixing through diluted acid, hydrolyzed, neutralized, decolourized by bright people, level Four cation and anion exchange, concentration, secondary decolourization, secondary Concentration and evaporation, crystallization and centrifugation finally obtain the xylose of purity >=98.5%, and ash content < 0.2% in the xylose is added by the xylose The conductivity that hydrogen reduction (xylose hydrogenation reduction prepares xylitol, is the common knowledge of this field) prepares resulting xylitol is less than 10 μ s/cm, for ash content less than 0.1%, the product of xylitol meets GB1886.234.The preparation process of the xylose is simple, condition temperature It is few with low for equipment requirements, xylose rate of recovery height, the wastewater flow rate generated, there is extensive promotional value.

(2) in hydrolysis workshop section, starting circulating pump makes to extract out and be sent into the slave hydrolyzer of serum recycle；It is this external to follow The mode of ring is uniformly mixed the material in hydrolyzer, can effectively solve the problem that the stirring dead angle in hydrolyzer and/or steam heating The problem of dead angle, makes solid-state viscose fiber waste material complete hydrolysis in hydrolyzer.

(3) operation temperature in hydrolyzer is at 110 ± 5 DEG C, at such a temperature, the temperature for the secondary steam being discharged from hydrolyzer It spends relatively high, this secondary steam is delivered to a concentration evaporator and/or secondary concentration evaporator as heat source and is used, energy The steam loss in system is enough effectively reduced, superheated steam is also avoided and is steamed into a concentration evaporator and/or secondary concentration The problem of needing pressure-regulating temp-regulating when sending out device.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is a kind of process flow chart that xylitol device is extracted from viscose fiber waste material described in the utility model；

Fig. 2 is the process flow chart of the part A of Fig. 1 described in the utility model；

Fig. 3 is the process flow chart of the part B of Fig. 1 described in the utility model；

Fig. 4 is the process flow chart of the C portion of Fig. 1 described in the utility model；

Fig. 5 is the process flow chart of the part D of Fig. 1 described in the utility model.

Wherein, each label respectively indicates in figure: 1. size mixing tank, 2, hydrolyzer, 3. filters, 4. neutralizing tanks, 6. decolorations Tank, 9. level-one cation exchange columns, 10. level-one anion-exchange columns, 11. second level cation exchange columns, 12. second level anion Exchange column, 13. concentration evaporators, 14. decolorizing columns, 15. secondary concentration evaporators, 16. crystallizing tanks, 17. centrifuges, 18. Circulating pump.

Specific embodiment

In order to make those skilled in the art better understand the scheme of the utility model, with reference to the accompanying drawing and specific implementation The utility model is described in further detail for mode.

Embodiment 1

As shown in Figs. 1-5, a method of extracting xylose from viscose fiber waste material, include the following steps:

Step (1) is sized mixing

Dilute sulfuric acid is added in tank 1 of sizing mixing, then solid-state viscose fiber waste material is slowly added to size mixing in tank 1, constantly stirs Mixing is uniformly mixed it with dilute sulfuric acid, solid waste in tank 1 of sizing mixing: sulfuric acid: the mass ratio of water is 15:3:82；

Step (2) hydrolysis

The slurries that step (1) is obtained inject in hydrolyzer 2 through circulating pump 18, and steam heating is constantly passed through in hydrolyzer 2 It heats up, in 0.08MPa, hydrolysis time control is small 2 for pressure control in 110 ± 5 DEG C, hydrolyzer 2 for temperature control in hydrolyzer 2 When, starting circulating pump 18 in hydrolytic process makes to extract out and enter in the slave hydrolyzer 2 of serum recycle；

Step (3) neutralizes

Feed liquid after step (2) hydrolysis is sent into after filtering in neutralizing tank 4, and lightweight carbonic acid is added into neutralizing tank 4 Calcium, the pH in neutralizing tank 4 are controlled in 3-5, in neutralizing tank 4, are persistently stirred after charging 30 minutes, stand after stopping stirring Until calcium sulfate sufficiently precipitates in feed liquid, time of repose was controlled at >=30 minutes, was filtered after standing, filtrate goes to step (4)；

Step (4) is once decolourized

Feed liquid after step (3) are neutralized, which is sent into after filtering in bleacher 6, decolourizes, and decolorising agent is active carbon, active carbon Additional amount be 40 ± 10kg/10m³Neutralizer, bleaching temperature control are being greater than 60 DEG C, and bleaching time is not less than 30 minutes；It is de- It is filtered after color through flame filter press, the light transmittance of filtrate is greater than 45% after filtering；

Step (5) positive and negative ion exchange

Filtrate after step (4) decolorization filtering is successively passed through into level-one cation exchange column 9, level-one anion-exchange column 10, second level cation exchange column 11, second level anion-exchange column 12, the light transmittance of filtrate is greater than 90% after positive and negative ion exchange, PH value >=3.5 of filtrate；

Step (6) flush distillation concentration

Filtrate after step (5) positive and negative ion exchange is subjected to first time vacuum evaporation, the folding of concentrate after concentration Light value is controlled in 45-55%；

Step (7) secondary decolourization

Step (6) resulting concentrate is decolourized, the light transmittance > 80% of concentrate, PH >=5 after decoloration；Decoloration Agent is granulated carbon；

The concentration of step (8) double evaporation-cooling

Concentrate after step (7) resulting decoloration is subjected to second of vacuum evaporation, after second is concentrated by evaporation, The refractive power value of concentrate is controlled 78~85%；The Steam pressure control of double evaporation-cooling concentration is in 0.02-0.15MPa, inlet amount Control is controlled in 2.0~4.5m3, vacuum degree >=0.07MPa, evaporating temperature at 80-95 DEG C；

Step (9) crystallization, centrifuge separation

Step (8) resulting material is subjected to crystallization operation, the initial temperature of crystallization controls at 60 DEG C, cools down 1 DEG C per hour, Until room temperature blowing, is xylose by the material centrifuge separation gained solid phase after crystallization.

Specifically, a kind of above-mentioned method that xylose is extracted from viscose fiber waste material, in step (3), in filter process Middle addition filter aid perlite.

Specifically, a kind of above-mentioned method that xylose is extracted from viscose fiber waste material, in step (5), level-one cation Exchange: after exchange, mineral acid content > 0.1-1% in solution, the light transmission value > 60% of solution；Level-one anion exchange: exchange Afterwards, the pH of solution is controlled in 3.0-6, the light transmission value > 70% of solution；The exchange of second level cation: after exchange, inorganic acid in solution Content > 0.01-0.1%, the light transmission value > 80% of solution；Second level anion exchange: exchanging conductivity≤200us/cm of liquid, After exchange, the pH of solution is controlled in 3-6, the light transmission value > 90% of solution.(in ion exchange process, the exchange of level-one cation It is to be led to calcium, magnesium plasma in solution etc. by resin adsorption acidity in solution to increase with second level base exchange process, The acidity PH meter of 0.1%-1% can not be measured accurately, and the technical staff of the utility model tests after its exchange nothing in solution thus The H when content of machine acid, level-one anion exchange and second level anion exchange, in solution^-By resin adsorption, cause sour in solution Degree reduces, and can test out the pH value of solution using pH meter at this time.)

Specifically, a kind of above-mentioned method that xylose is extracted from viscose fiber waste material, in step (2), half fiber after hydrolysis Dimension hplc is greater than or equal to 150g/l.

Specifically, a kind of above-mentioned method that xylose is extracted from viscose fiber waste material, in step (2), when hydrolysis, is controlled Sulfuric acid content in hydrolyzer (2) is 3%.

Xylitol can be made after adding H to restore by xylose prepared by the above method, since the purity of the xylose is greater than 98.5%, ash content is less than 0.2%, and the conductivity of the xylitol of preparation is less than 10 μ s/cm, and ash content is less than 0.1%, the production of xylitol Product meet GB1886.234.

The invention also discloses a kind of from viscose fiber waste material extracts the device of xylose, which includes successively connecting Tank 1 of sizing mixing, hydrolyzer 2, neutralizing tank 4, bleacher 6, level-one cation exchange column 9, the level-one anion-exchange column 10, second level connect Cation exchange column 11,12, concentration evaporators 13 of second level anion-exchange column, decolorizing column 14, secondary concentration evaporator 15, Crystallizing tank 16 and centrifuge 17；Viscose fiber production waste material import and diluted acid water inlet are offered on tank 1 sizing mixing, in hydrolyzer It is connected with steam on 2 and enters pipeline, precipitated calcium carbonate import is offered on neutralizing tank 4, offers active carbon on bleacher 6 Import, a concentration evaporator 13 and secondary concentration evaporator 15 are cold boiler；The connection relationship of each section is to size mixing The outlet of tank 1 is connected by pipeline with the import of hydrolyzer 2, and material passes through pipeline in after the filtering of filter 3 in hydrolyzer 2 It is connected with the import of tank 4, material is connected by pipeline with the import of bleacher 6 after the filtering of filter 3 in neutralizing tank 4, is decolourized Material is connected by pipeline with the import of level-one cation exchange column 9 after the filtering of filter 3 in tank 6, the exchange of level-one cation The outlet of column 9 is connected by pipeline with the import of level-one anion-exchange column 10, and the outlet of level-one anion-exchange column 10 passes through Pipeline is connected with the import of second level cation exchange column 11, the outlet of second level cation exchange column 11 by pipeline and second level yin from The import of sub- exchange column 12 is connected, and the outlet of second level anion-exchange column 12 passes through the import of pipeline and a concentration evaporator 13 It is connected, the outlet of a concentration evaporator 13 is connected by pipeline with 14 import of decolorizing column, and the outlet of decolorizing column 14 passes through pipeline It is connected with the import of secondary concentration evaporator 15, the outlet of secondary concentration evaporator 15 passes through the import phase of pipeline and crystallizing tank 16 Even, the outlet of crystallizing tank 16 is connected with the import of centrifuge 17.

Specifically, above-mentioned a kind of device that xylose is extracted from viscose fiber waste material, the tank 1 of sizing mixing, neutralizing tank 4 Agitating paddle and stirring motor are provided with bleacher 6.

Specifically, above-mentioned a kind of device that xylose is extracted from viscose fiber waste material, is externally connected with circulation in hydrolyzer 2 Pump 18, what circulating pump 18 recycled makes material extract out and be sent into from hydrolyzer 2.In hydrolysis workshop section, starting circulating pump makes slurries It extracts out and is sent into the slave hydrolyzer of circulation；The mode of this external circulation is uniformly mixed the material in hydrolyzer, Neng Gouyou Effect solves the problems, such as stirring dead angle and/or steam heating dead angle in hydrolyzer, makes solid-state viscose fiber waste material in hydrolyzer Complete hydrolysis.

Specifically, above-mentioned a kind of device that xylose is extracted from viscose fiber waste material, the top of the hydrolyzer 2 Steam (vapor) outlet is offered, which passes through the steaming of pipeline and a concentration evaporator 13 and/or secondary concentration evaporator 15 Vapor inlet is connected.Operation temperature in hydrolyzer is at 110 ± 5 DEG C, at such a temperature, the temperature for the secondary steam being discharged from hydrolyzer It spends relatively high, this secondary steam is delivered to a concentration evaporator and/or secondary concentration evaporator as heat source and is used, energy The steam loss in system is enough effectively reduced, superheated steam is also avoided and is steamed into a concentration evaporator and/or secondary concentration The problem of needing pressure-regulating temp-regulating when sending out device.

A kind of working principle of method and apparatus for extracting xylose from viscose fiber waste material described in the utility model is: Solid-state viscose fiber waste material and dilute sulfuric acid are delivered in tank 1 of sizing mixing, and solid-state viscose fiber waste material and dilute sulfuric acid are mixed in tank 1 of sizing mixing It closes uniformly, slurry is made, slurry is delivered in hydrolyzer 2 through pump, and be constantly full of steam, hydrolyzer 2 into hydrolyzer 2 It is externally connected with circulating pump 18, the slurry in hydrolyzer 2 is cyclically pumped into and is pumped out by circulating pump 18, the hydrolysis of this external circulation Mode can effectively avoid circulation dead angle and steam pocket in hydrolyzer 2, make the slurry complete hydrolysis in hydrolyzer 2, hydrolysis Slurry afterwards is delivered to filter 3 through pump, and after filtering, filtrate enters in neutralizing tank 4, and lightweight carbonic acid is put into neutralizing tank 4 In neutralizing tank 4 CaCO occurs for calcium for neutralizing the acid in filtrate₃+H₂SO₄=CaSO₄(precipitating)+H₂O+CO₂(volatilization) It reacts, the reaction in neutralizing tank 4 is for removing the sulfate radical in filtrate, after the completion of neutralization, the material in neutralizing tank 4 is defeated through pumping It send to filter 3, after filtering, solid phase is calcium sulfate, and solid phase after drying, obtains the calcium sulfate of product drying, in neutralizing tank 4 Constantly there is carbon dioxide generation when middle neutralization operation, the porosity of obtained calcium sulfate is higher, and application prospect is preferable；Neutralize filtering Liquid phase afterwards enters in bleacher 6, after completing decoloration in bleacher 6, filters through filter 3, filtrate is through level Four zwitterion Exchange column is respectively completed anion exchange twice and cation exchange, the impurity in filtrate is removed, removes impurity in filtrate Afterwards, filtrate is sent into primary concentration evaporator 13, completes the primary concentration of xylose, in order to further remove the impurity in xylose, Xylose after concentration is entered into secondary concentration evaporator after decolorizing column 14 carries out secondary decolourization and carries out secondary concentration, secondary concentration After the crystallized tank 16 of xylose solution afterwards crystallizes, the xylose crystallized, purity >=98.5% of the xylose, ash content < 0.2%.

Design scheme provided by the utility model is described in detail above.Specific case pair used herein The embodiments of the present invention is expounded, the side of the above embodiments are only used to help understand the utility model Method and its core concept.It should be pointed out that for those skilled in the art, it is practical new not departing from this Under the premise of type principle, several improvements and modifications can be made to this utility model, these improvement and modification also fall into this reality With in novel scope of protection of the claims.

Claims (4)

1. a kind of device for extracting xylose from viscose fiber waste material, which is characterized in that the device includes sequentially connected sizes mixing Tank (1), hydrolyzer (2), neutralizing tank (4), bleacher (6), level-one cation exchange column (9), level-one anion-exchange column (10), It is second level cation exchange column (11), second level anion-exchange column (12), a concentration evaporator (13), decolorizing column (14), secondary Concentration evaporator (15), crystallizing tank (16) and centrifuge (17)；Viscose fiber production waste material import is offered on tank of sizing mixing (1) With diluted acid water inlet, be connected with steam on hydrolyzer (2) and enter pipeline, offered on neutralizing tank (4) precipitated calcium carbonate into Mouthful, active carbon import is offered on bleacher (6), a concentration evaporator (13) and secondary concentration evaporator (15) they are true Empty evaporator；The connection relationship of each section is that the size mixing outlet of tank (1) is connected by pipeline with the import of hydrolyzer (2), hydrolysis Pot (2) interior material is connected by pipeline with the import of neutralizing tank (4) after filter (3) filtering, and the interior material of neutralizing tank (4) passes through It is connected by pipeline with the import of bleacher (6) after filter (3) filtering, bleacher (6) interior material leads to after filter (3) are filtered Piping is connected with the import of level-one cation exchange column (9), and the outlet of level-one cation exchange column (9) passes through pipeline and level-one The import of anion-exchange column (10) is connected, and the outlet of level-one anion-exchange column (10) is exchanged by pipeline with second level cation The import of column (11) is connected, the outlet of second level cation exchange column (11) by pipeline and second level anion-exchange column (12) into Mouth is connected, and the outlet of second level anion-exchange column (12) is connected by pipeline with the import of a concentration evaporator (13), once The outlet of concentration evaporator (13) is connected by pipeline with decolorizing column (14) import, and the outlet of decolorizing column (14) passes through pipeline and two The import of secondary concentration evaporator (15) is connected, and the outlet of secondary concentration evaporator (15) passes through the import of pipeline and crystallizing tank (16) It is connected, the outlet of crystallizing tank (16) is connected with the import of centrifuge (17).

2. a kind of device for extracting xylose from viscose fiber waste material according to claim 1, which is characterized in that described Size mixing tank (1), neutralizing tank (4) and bleacher (6) is provided with agitating paddle and stirring motor.

3. a kind of device for extracting xylose from viscose fiber waste material according to claim 1, which is characterized in that hydrolyzing Pot (2) is externally connected with circulating pump (18), and circulating pump (18) circulation makes material extraction and feeding from hydrolyzer (2).

4. a kind of device for extracting xylose from viscose fiber waste material according to claim 1, which is characterized in that described Hydrolyzer offers steam (vapor) outlet at the top of (2), which passes through pipeline and a concentration evaporator (13) and/or secondary The steam inlet of concentration evaporator (15) is connected.