阅读说明：本技术 一种半纤维素水解液的电渗析分离工艺 (A kind of electrodialysis separating technology of hemicellulose hydrolysate ) 是由 莫世清 陈德水 徐小荣 王战龙 吴限智 于 2019-08-06 设计创作，主要内容包括：本发明公开了一种半纤维素水解液的电渗析分离工艺,属于木糖生产技术领域。对半纤维素水解液进行三级电渗析,最终得到第一级高盐液、第二级高盐液、第三级高盐液和第三级高糖液,第一级高盐液经稀释、中和后可直接排放或回用；而第三级高盐液经浓缩及脱盐后,与第三级高糖液一并作为满足指标(电导≤4000us/cm、无机酸≤0.3%、木糖含量≥55g/L及木糖纯度≥80%)的最终料液进入下一工序；本发明应用于半纤维素水解液的脱盐、脱酸,进而达到对木糖溶液的除杂、纯化目的,在提高木糖质量及生产效率的前提下,减少跑糖量,提高经济效益,同时,减少难处理污水的排放,降低环保压力。(The invention discloses a kind of electrodialysis separating technologies of hemicellulose hydrolysate, belong to technical field of xylose production.Three-stage electrodialysis is carried out to hemicellulose hydrolysate, finally obtains the high saline solution of the first order, the high saline solution in the second level, the high saline solution of the third level and the high liquid glucose of the third level, the high saline solution of the first order can direct emission or reuse after being diluted, being neutralized；And after the high saline solution of the third level is concentrated and desalination, enter subsequent processing as the final feed liquid for meeting index (conductance≤4000us/cm, inorganic acid≤0.3%, Xylose Content >=55g/L and xylose purity >=80%) together with the high liquid glucose of the third level；The present invention is applied to desalination, the depickling of hemicellulose hydrolysate, and then reaches removal of impurities to xylose solution, purifying purpose, under the premise of improving xylose quality and production efficiency, it reduces and runs sugar amount, increase economic efficiency, simultaneously, the discharge of difficult sewage is reduced, environmental protection pressure is reduced.)

1. a kind of electrodialysis separating technology of hemicellulose hydrolysate, which comprises the steps of:

1) first order electrodialysis: hemicellulose hydrolysate is passed through to first order electrodialysis system, and is passed through the high saline solution in the second level, It is acted on through electrodialytic membranes, obtains the high liquid glucose of the first order and the high saline solution of the first order；

2) second level electrodialysis: it will be passed through through the high liquid glucose of the resulting first order of step 1) to second level electrodialysis system, and be passed through Demineralized water is acted on through electrodialytic membranes, obtains the high saline solution of the high liquid glucose in the second level and the second level；

3) third level electrodialysis: it will be passed through through the high liquid glucose in the resulting second level of step 2 to third level electrodialysis system, and be passed through Demineralized water is acted on through electrodialytic membranes, obtains the high liquid glucose of the third level and the high saline solution of the third level；

4) it post-processes: after the high saline solution concentration of the third level and desalination, being stored in temporary storage tank together with the high liquid glucose of the third level, so Afterwards, it is injected into ion exchange column, chromatographs, obtain xylose solution.

2. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 1, which is characterized in that in step 1) In, the hemicellulose hydrolysate include content be 70~90g/L xylose, content is 20~22g/L sodium sulphate and content is 20 ~25g/L sulfuric acid.

3. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 1, which is characterized in that in step 4) In, the high saline solution conductance of the third level after concentration is 200~250 ms/cm；The high saline solution conductance of the third level after desalination is 3~5 ms/cm。

4. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 1, which is characterized in that in step 1) In first order electrodialysis system, hemicellulose hydrolysate feed rate is 40~50m³/ h, the high saline solution feed rate in the second level are 15~17m³/h；Voltage is 150V, and electric current 100A, temperature is 40~45 DEG C；The high saline solution discharging flow of the first order be 15~ 17m³/ h, the high liquid glucose discharging flow of the first order are 40~50m³/h；

In the second level electrodialysis system of step 2, the high liquid glucose feed rate of the first order is 40~50m³/ h, demineralized water feeding flow Amount is 15~17m³/h；Voltage is 150V, and electric current 100A, temperature is 40~45 DEG C；The high saline solution discharging flow in the second level is 15 ~17m³/ h, the high liquid glucose discharging flow in the second level are 40~50m³/h；

In the third level electrodialysis system of step 3), the high liquid glucose feed rate in the second level is 40~50m³/ h, demineralized water feeding flow Amount is 15~17m³/h；Voltage is 150V, and electric current is 75~100A, and temperature is 40~45 DEG C；The high saline solution discharging flow of the third level For 15~17m³/ h, the high liquid glucose discharging flow of the third level are 40~50m³/h。

5. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 1, which is characterized in that in step 1) In, the high saline solution of the first order include concentration be 17~20g/L reduced sugar, concentration is 35~45g/L sulfuric acid and concentration is 15~18g/L Sodium sulphate；The high liquid glucose of the first order include concentration be 75~90g/L reduced sugar, concentration is 12~14g/L sulfuric acid and concentration be 5~ 10g/L sodium sulphate；

In step 2, the high saline solution in the second level include concentration be 15~18g/L reduced sugar, concentration is 20~35g/L sulfuric acid and dense Degree is 15~18g/L sodium sulphate；The high liquid glucose in the second level include concentration be 75~90g/L reduced sugar, concentration is 5~10g/L sulfuric acid And concentration is 5~10g/L sodium sulphate；

In step 3), the high saline solution of the third level include concentration be 13~15g/L reduced sugar, concentration is 5~8g/L sulfuric acid and concentration For 5~8g/L sodium sulphate；The high liquid glucose of the third level include concentration be 75~90g/L reduced sugar, concentration is 1~2g/L sulfuric acid and concentration For 1~2g/L sodium sulphate.

6. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 1, which is characterized in that in step 1) In, the high saline solution conductance of the first order is 150~180ms/cm, and pH is 0.5~1.0, and refractive power is 5.5~6.5；The high liquid glucose electricity of the first order Leading as 40~50ms/cm, pH is 1.0~1.3, and refractive power is 8.0~9.0；

In step 2, the high saline solution conductance in the second level is 70~80ms/cm, and pH is 1.0~1.2, and refractive power is 3~4；The second level is high Liquid glucose conductance is 18~20ms/cm, and pH is 1.8~2.1, and refractive power is 8.0~9.0；

In step 3), the high saline solution conductance of the third level is 20~30ms/cm, and pH is 2~2.2, and refractive power is 1~2；The high sugar of the third level Liquid conductance is 3~4ms/cm, and pH is 2.2~2.8, and refractive power is 8.0~9.0.

7. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 1, which is characterized in that through electrodialysis point From rear, detection feed liquid is simultaneously obtained: conductance≤4000us/cm, light transmittance >=98.0%, refractive power >=7.0,18.5 ° of specific rotatory power~ 19.5 °, pH is 2.2~2.8；Content of reducing sugar >=70g/L, Xylose Content >=55g/L, xylose purity >=80%；Inorganic acid≤ 0.3%, total acid≤0.4%, sulphates content≤0.005%, ash content≤0.05%, moisture≤0.3%, chloride≤0.005%.

8. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 1, which is characterized in that carry out electrodialysis Separating technology, involved electrodialysis separation system include desalination water storage tank (1) and electrodialysis plant, and the electrodialysis plant is three It is a, respectively first order electrodialysis plant (2), second level electrodialysis plant (3) and third level electrodialysis plant (4), the first order Electrodialysis plant (2) is connect with second level electrodialysis plant (3), first order electrodialysis plant (2) and second level electrodialysis plant (3) first order electrodialysis system is formed between；Second level electrodialysis plant (3) is connect with desalination water storage tank (1), desalination water storage tank (1) second level electrodialysis system is formed between second level electrodialysis plant (3)；Second level electrodialysis plant (3) and the third level Electrodialysis plant (4) connection, third level electrodialysis plant (4) are connect with desalination water storage tank (1), desalination water storage tank (1) and third Third level electrodialysis system is formed between grade electrodialysis plant (4).

9. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 8, which is characterized in that the first order Electrodialysis plant (2) feed inlet is connected with the delivery pipe (5) of conveying hemicellulose hydrolysate, the high sugar of first order electrodialysis plant (2) Liquid outlet is connect by delivery pipe (5) with second level electrodialysis plant (3) feed inlet, second level electrodialysis plant (3) high saline solution Outlet is connect by delivery pipe (5) with first order electrodialysis plant (2), and the high liquid glucose outlet of second level electrodialysis plant (3) passes through Delivery pipe (5) is connect with third level electrodialysis plant (4) feed inlet；The high liquid glucose outlet of third level electrodialysis plant (4) passes through defeated Pipe (5) is sent to be connected with temporary storage tank (6), the high saline solution outlet of third level electrodialysis plant (4) passes through delivery pipe (5) and temporary storage tank (6) Connection.

10. the electrodialysis separating technology of hemicellulose hydrolysate according to claim 9, which is characterized in that the third Enrichment facility (7) and desalter (8), the third level are additionally provided between the high saline solution outlet of grade electrodialysis plant (4) and temporary storage tank (6) The high saline solution outlet of electrodialysis plant (4) is connect with enrichment facility (7), and enrichment facility (7) is connect with desalter (8), desalination dress It sets (8) to connect with temporary storage tank (6), temporary storage tank (6) is connected with ion exchange column (11).

Technical field

The present invention relates to a kind of electrodialysis separating technology of hemicellulose hydrolysate more particularly to it is a kind of use electroosmose process Remove sulfuric acid in hemicellulose hydrolysate, sodium sulphate and prepare the separating technology of xylose, belong to technical field of xylose production.

Background technique

Hemicellulose is the primary raw material for producing xylose, wherein main during preparing xylose as raw material using hemicellulose Wanting process includes hydrolysis, decoloration, desalination, deacidification, evaporation, centrifugation and drying etc..Produce xylose specifically comprises the processes of: with hemicellulose Element is raw material, in a heated condition, sulfuric acid is added into hemicellulose, hemicellulose is xylose by sulphuric acid hydrolysis and other are miscellaneous Sugar, meanwhile, there are the impurity such as sodium sulphate and sulfuric acid in hydrolyzate；And before rotary process, the xylose of generation is with solution shape State exists, and therefore, in order to improve xylose quality, needs effectively to remove the impurity such as sodium sulphate, sulfuric acid in hemicellulose hydrolysate.

Currently, in existing separation method, be added generally into hemicellulose hydrolysate salt (such as: calcium oxide, carbonic acid Barium), acid (such as: sulfuric acid) generate precipitating (calcium sulfate or barium sulfate), with reach the sodium sulphate removed in hemicellulose hydrolysate, The impurity such as sulfuric acid, but this separating technology is complicated, and controllable difficulty is big, and low efficiency is at high cost, and still there is electrolyte in hydrolyzate More residual, without being able to satisfy actual process demand.

State Intellectual Property Office disclosed a kind of Publication No. CN109575088A on 04 05th, 2019, and entitled " one The patent document of the refining methd of xylose in kind hemicellulose hydrolysate ", wherein specific open: it is related to chemical production technical neck Domain, method includes the following steps: 1), into ultrafiltration membrane, obtaining permeate after hemicellulose hydrolysate removal of impurities；2) it will transmit through liquid It is separated using nanofiltration membrane, sulfuric acid stays in concentrate, and permeate contains acetic acid and xylose；3) acetic acid and xylose aqueous solution are adopted It is separated with electrodialysis；4) xylose aqueous solution is directly used in the production of furfural；5) acetic acid carries out extraction and separation with solvent extraction rectifying Obtain the acetic acid of 98.5% concentration.This method is easy to operate, and obtained xylose aqueous solution is directly used in the production of furfural, and obtains Mass concentration be 20% or so acetic acid, with solvent extraction rectifier unit carries out extraction and separation can be obtained mass concentration be 98.5% Acetic acid.In the technique, the sulfuric acid separated returns to hydrolyzing process and continues to use, and effective component is carried out recycling and reusing, Production cost is saved.

State Intellectual Property Office disclosed a kind of Publication No. CN101792822A on 08 04th, 2010, entitled " from The patent document of the method for separating-purifying xylose, arabinose in hemicellulose acid hydrolysis liquid ", wherein specific open: separation mentions Pure step is as follows: (1) hemicellulose hydrolysate for obtaining direct sour water solution is pre-processed through electrodialysis, film filtering and concentrating, high Pure water progress deoxidation, filtering are spare；(2) enter moving bed imitation chromatogram separation facility by pretreated hemicellulose hydrolysate It is separated, two kinds of out-feed liquids is obtained after separation；(3) two kinds of out-feed liquids are concentrated with multiple-effect falling film evaporator, decrease temperature crystalline obtains To xylose, arabinose product.The present invention extracts monosaccharide using moving bed imitation chromatogram separation facility (SSMB) system, will be multiple Adsorption column is connected into closed loop, changes the inlet and outlet position of each stock material by continuous switch valve, realizes solid, liquid two-phase Relative movement, carries out the separation and Extraction of different component, its existing ADSORPTION IN A FIXED BED advantage easy to operate, and has moving bed continuous The ability of operation is suitble to large-scale industrial production.

Although disclosing electroosmose process in above two existing technical literatures to the separating treatment of hemicellulose hydrolysate, But there is also following technical problems: one, after electrodialysis process, generated waste water environmental pollution is serious, causes environment pressure Power；Two, it is big to run sugar amount, results in waste of resources, and cause environmental protection pressure；Three, electrodialytic membranes service life is short, in unfavorable work It is replaced frequently under condition, causes at high cost, and discarded film process is difficult.

Summary of the invention

The present invention is directed to overcome the shortage of prior art, and propose a kind of electrodialysis separating technology of hemicellulose hydrolysate. In the present invention, three-stage electrodialysis is carried out to the hemicellulose hydrolysate after the pre-treatments such as filtering, decoloration, ultrafiltration, it is final to obtain To the high saline solution of the first order, the high saline solution in the second level, the high saline solution of the third level and the high liquid glucose of the third level, the high saline solution of the first order through dilution, in With after can direct emission, it is small to environmental pressure, alternatively, cycling and reutilization, reduce waste, save the cost；And the high saline solution of the third level (including concentration is 13~15g/L reduced sugar, concentration is 0.5~0.8g/L sulfuric acid, and concentration is 0.5~0.8g/L sodium sulphate, and electric After leading as 20~30ms/cm) is concentrated and desalination, with the high liquid glucose of the third level together as meeting index (conductance≤4000us/ Cm, refractive power >=7.0, inorganic acid≤0.3%, total acid≤0.4%, content of reducing sugar >=70g/L, Xylose Content >=55g/L and xylose Purity >=80%) final feed liquid enter subsequent processing.

The present invention is applied to desalination, the depickling of hemicellulose hydrolysate, and then reaches removal of impurities to xylose solution, purifying mesh , under the premise of improving xylose quality and production efficiency, reduces and run sugar amount (70~80%), increase economic efficiency, meanwhile, subtract The discharge of few difficult sewage, reduces environmental protection pressure.

In order to achieve the above technical purposes, the following technical solutions are proposed:

A kind of electrodialysis separating technology of hemicellulose hydrolysate, includes the following steps:

1) first order electrodialysis: hemicellulose hydrolysate is passed through to first order electrodialysis system, and is passed through the high saline solution in the second level, It is acted on through electrodialytic membranes, obtains the high liquid glucose of the first order and the high saline solution of the first order；

2) second level electrodialysis: it will be passed through through the high liquid glucose of the resulting first order of step 1) to second level electrodialysis system, and be passed through Demineralized water is acted on through electrodialytic membranes, obtains the high saline solution of the high liquid glucose in the second level and the second level；

3) third level electrodialysis: it will be passed through through the high liquid glucose in the resulting second level of step 2 to third level electrodialysis system, and be passed through Demineralized water is acted on through electrodialytic membranes, obtains the high liquid glucose of the third level and the high saline solution of the third level；

4) it post-processes: after the high saline solution concentration of the third level and desalination, being stored in temporary storage tank together with the high liquid glucose of the third level, so Afterwards, it is injected into ion exchange column, chromatographs, obtain xylose solution.

Further, the hemicellulose hydrolysate refers to: with hemicellulosic material, after sulphuric acid hydrolysis, use is existing Hemicellulose hydrolysate after the pre-treatments such as mature technology is filtered, decolourizes, ultrafiltration.Wherein, in the hydrolysis of hemicellulose In liquid, Xylose Content is 70~90g/L, 20~22g/L of sodium sulphate content, 20~25g/L of sulfuric acid content.

Further, in step 1), 2) and 3) in, the electrodialytic membranes is alloy film.

Further, it in the enrichment process of step 4), is concentrated using homogeneous electrodialytic membranes or alloy film, after concentration The high saline solution conductance of the third level be 200~250 ms/cm.

Further, in step 4) desalination process, desalination is carried out using alloy film, the high saline solution electricity of the third level after desalination It leads as 3~5 ms/cm.

Further, in the first order electrodialysis system of step 1), hemicellulose hydrolysate feed rate be 40~ 50m³/ h, the high saline solution feed rate in the second level are 15~17m³/h；Voltage is 150V, and electric current 100A, temperature is 40~45 DEG C； The high saline solution discharging flow of the first order is 15~17m³/ h, the high liquid glucose discharging flow of the first order are 40~50m³/h；

In the second level electrodialysis system of step 2, the high liquid glucose feed rate of the first order is 40~50m³/ h, demineralized water charging Flow is 15~17m³/h；Voltage is 150V, and electric current 100A, temperature is 40~45 DEG C；The high saline solution discharging flow in the second level is 15~17m³/ h, the high liquid glucose discharging flow in the second level are 40~50m³/h；

In the third level electrodialysis system of step 3), the high liquid glucose feed rate in the second level is 40~50m³/ h, demineralized water charging Flow is 15~17m³/h；Voltage is 150V, and electric current is 75~100A, and temperature is 40~45 DEG C；The high saline solution reactor effluent stream of the third level Amount is 15~17m³/ h, the high liquid glucose discharging flow of the third level are 40~50m³/h。

Further, in step 1), the high saline solution of the first order include concentration be 17~20g/L reduced sugar, concentration be 35~ 45g/L sulfuric acid and concentration are 15~18g/L sodium sulphate；The high liquid glucose of the first order include concentration be 75~90g/L reduced sugar, concentration is 12~14g/L sulfuric acid and concentration are 5~10g/L sodium sulphate；

In step 2, the high saline solution in the second level include concentration be 15~18g/L reduced sugar, concentration is 20~35g/L sulfuric acid and dense Degree is 15~18g/L sodium sulphate；The high liquid glucose in the second level include concentration be 75~90g/L reduced sugar, concentration is 5~10g/L sulfuric acid And concentration is 5~10g/L sodium sulphate；

In step 3), the high saline solution of the third level include concentration be 13~15g/L reduced sugar, concentration is 5~8g/L sulfuric acid and concentration For 5~8g/L sodium sulphate；The high liquid glucose of the third level include concentration be 75~90g/L reduced sugar, concentration is 1~2g/L sulfuric acid and concentration For 1~2g/L sodium sulphate.

Further, in step 1), the high saline solution conductance of the first order is 150~180ms/cm, and pH is 0.5~1.0, refractive power It is 5.5~6.5；The high liquid glucose conductance of the first order is 40~50ms/cm, and pH is 1.0~1.3, and refractive power is 8.0~9.0；

In step 2, the high saline solution conductance in the second level is 70~80ms/cm, and pH is 1.0~1.2, and refractive power is 3~4；The second level is high Liquid glucose conductance is 18~20ms/cm, and pH is 1.8~2.1, and refractive power is 8.0~9.0；

In step 3), the high saline solution conductance of the third level is 20~30ms/cm, and pH is 2~2.2, and refractive power is 1~2；The high sugar of the third level Liquid conductance is 3~4ms/cm, and pH is 2.2~2.8, and refractive power is 8.0~9.0.

According to standard " xylose of GB/T23532~2009 ", through detecting, the hemicellulose hydrolysate is separated through electrodialysis Afterwards: conductance≤4000us/cm, light transmittance >=98.0%, refractive power >=7.0,18.5 °~19.5 ° of specific rotatory power, pH is 2.2~2.8； Content of reducing sugar >=70g/L, Xylose Content >=55g/L, xylose purity >=80%；Inorganic acid≤0.3%, total acid≤0.4%, sulfuric acid Salt content≤0.005%, ash content≤0.05%, moisture≤0.3%, chloride≤0.005%.

Electrodialysis separation system includes desalination water storage tank and electrodialysis plant, and the electrodialysis plant is three, respectively First order electrodialysis plant, second level electrodialysis plant and third level electrodialysis plant, first order electrodialysis plant and the second level Electrodialysis plant connection, forms first order electrodialysis system between first order electrodialysis plant and second level electrodialysis plant；The Second level electrodialysis plant is connect with desalination water storage tank, and second level electric osmose is formed between desalination water storage tank and second level electrodialysis plant Analysis system；Second level electrodialysis plant is connect with third level electrodialysis plant, and third level electrodialysis plant and desalination water storage tank connect It connects, forms third level electrodialysis system between desalination water storage tank and third level electrodialysis plant.

Further, the first order electrodialysis plant feed inlet is connected with the delivery pipe of conveying hemicellulose hydrolysate, the The high liquid glucose outlet of level-one electrodialysis plant is connect by delivery pipe with second level electrodialysis plant feed inlet, second level electrodialysis dress It sets high saline solution outlet to connect by delivery pipe with first order electrodialysis plant, electrodialysis plant high liquid glucose outlet in the second level passes through defeated Pipe is sent to connect with third level electrodialysis plant feed inlet；The high liquid glucose outlet of third level electrodialysis plant is connected with temporarily by delivery pipe Tank is deposited, the high saline solution outlet of third level electrodialysis plant is connect by delivery pipe with temporary storage tank.

Further, enrichment facility is additionally provided between the high saline solution outlet of the third level electrodialysis plant and temporary storage tank and take off Salt device, the high saline solution outlet of third level electrodialysis plant are connect with enrichment facility, and enrichment facility is connect with desalter, desalination dress It sets and is connect with temporary storage tank, temporary storage tank is connected with ion exchange column.

Further, the electrodialysis separation system further includes thinning tank and neutralizing tank, and first order electrodialysis plant is with high salt Liquid outlet is connect by delivery pipe with thinning tank, and thinning tank is connect with neutralizing tank；Neutralizing tank is connected with wastewater discharge pipe, alternatively, Neutralizing tank is connect by delivery pipe with reclamation set.

In each delivery pipe according to actual needs, it is provided with control valve.

In the technical scheme, it is related to working principle are as follows:

In electrodialysis separation system, power supply positive and negative polarities directly replace, parallel placement anode membrane and cavity block, anode membrane and cavity block structure Film forming group, and being spaced apart film group and film group with partition, form freshwater room and concentrated water room.Hemicellulose is passed through into freshwater room Hydrolyzate material is passed through demineralized water into concentrated water room, under the action of DC electric field, in freshwater room cation (sodium ion, hydrogen from Son) it is migrated to cathode, cation-exchange membrane can only be passed through；Anion (sulfate ion, hydroxide ion) is migrated to anode, only It can be by anion-exchange membrane, so that sodium sulphate and sulfuric acid desalination in freshwater room；Sodium sulphate and sulfuric acid are concentrated in concentrated water room, will High saline solution and high liquid glucose are drawn respectively, to reach desalination, depickling purpose.

The present invention is to fully ensure that electrodialysis effect, carries out first order electrodialysis, second level electrodialysis and third level electric osmose Analyse operation；Since content of reducing sugar is 13~15g/L in the high saline solution of the third level and conductance is 20~30ms/cm, and the first order is high Content of reducing sugar is 75~90g/L in liquid glucose and conductance is 40~50ms/cm, based on the ratio between reduced sugar and conductance Speech, the sugared salt of the high saline solution of the third level is relatively low, and can prepare raw material directly as xylose after its concentration and desalination (de- conductance) makes With, so, with the high liquid glucose of the third level together as meet index (conductance≤4000us/cm, refractive power >=7.0, inorganic acid≤ 0.3%, total acid≤0.4%, content of reducing sugar >=70g/L, Xylose Content >=55g/L and xylose purity >=80%) final feed liquid into Enter subsequent processing；It can direct emission or reuse after the high saline solution dilution of the first order, neutralization.

Using the technical program, bring advantageous effects are as follows:

One, the present invention is applied to desalination, the depickling of hemicellulose hydrolysate, and then reaches removal of impurities to xylose solution, purifying mesh , under the premise of improving xylose quality and production efficiency, reduces and run sugar amount (70~80%), increase economic efficiency.Meanwhile subtracting The discharge of few difficult sewage, is greatly improved environmental benefit, reduces environmental protection pressure, such as: reduce organic emission about 3.5 Ton/day, sewage disposal expense saves about 12 yuan/ton, and sewage load reduces 200 cubes/day etc.；

Two, the present invention removes electrolyte using electroosmose process, operating efficiency and the validity except electrolyte is improved, so that controllability is more Height, and effectively avoid introducing new impurity, reduces cost, and by about 2.5 ten thousand yuan/day of profit increase；

Three, in the present invention, by after the high saline solution of the third level is concentrated and desalination, with the high liquid glucose of the third level together as meeting index Final feed liquid enter subsequent processing, sugar amount will be run and reduced by 10% to 2~3%, and by about 2.8 ton/days of xylose output increased；

Four, it in the present invention, is largely recovered due to running sugar, the service life of electrodialysis plant increases considerably (the diaphragm longevity Life improves 30% or more), this not only increases the stability of xylose preparation process, but also also improves equipment usability, reduces equipment The cost of consumption.

Detailed description of the invention

Fig. 1 is the logic connectivity diagram of electrodialysis separation system in the present invention；

Fig. 2 is the workflow block diagram of electrodialysis separation system in the present invention；

Fig. 3 is the electrodialysis operation principle schematic diagram in the present invention；

Wherein, in figure: 1, desalination water storage tank, 2, first order electrodialysis plant, 3, second level electrodialysis plant, 4, third level electric osmose Analysis apparatus, 5, delivery pipe, 6, temporary storage tank, 7, enrichment facility, 8, desalter, 9, thinning tank, 10, neutralizing tank, 11, ion exchange Column.

Specific embodiment

Below by technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality Applying example is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general Logical technical staff all other embodiment obtained without making creative work belongs to what the present invention protected Range.