Method for purifying xylose hydrolysate through desalination by three-zone simulated moving bed

A technology for simulating moving bed and xylose hydrolyzate, applied in the field of functional sugar production and separation, can solve the problems of inorganic salt ion contamination of functional partitions, increase of control sites and matching valves, complicated operation steps and system, etc., and achieve simplified control. System and device operation steps, the effect of reducing the amount and number of columns, and reducing the amount of process wastewater

Pending Publication Date: 2020-09-25
JIANGNAN UNIV
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Problems solved by technology

Chinese patent (publication number CN102597253A) discloses a method of extracting xylose from hydrolyzate by electrodialysis direct recovery method, and the conductivity of xylose electrodialysis solution is lower than 1000μS / cm
However, the device used and the steps of the method described therein are cumbersome (seven sub-steps), the removal of inorganic salt ions and separation are coupled together, the removal of ions and the separation of sugar components cannot be done well, and there is a problem of excessive dilution of the solution
Chinese patent (publication number CN106282427A) discloses a kind of preparation method of xylose, chromatographic desalination and ion exchange are combined to remove inorganic salt ion and refine xylose hydrolyzate, but described process is more loaded down with trivial details, does not provide chromatographic desalination method and run instance
The Chinese patent (publication number CN107893132A) discloses a production method and device for xylose. Chromatography and nanofiltration membranes are combined to remove impurities, decolorize and remove electrolytes from xylose hydrolyzate. The technical scheme for the implementation of chromatographic separation is not given.
[0008] Chinese patent (publication number CN208087530A) discloses a deacidification and desalination device for xylose hydrolyzate, which uses a four-zone simulated moving bed for deacidification and desalination; the four-zone simulated moving bed requires at least 4 chromatographic columns, and the number of control points and supporting valves increases; The fast-moving inorganic salt ions in the circulating fluid may contaminate other functional partitions
Chinese patent (publication number CN109439807A) discloses a xylose production process. After xylose hydrolyzate is decolorized and filtered by flash evaporation, it is concentrated by secondary flash evaporation and membrane distillation, and the closed-loop Novasep Varicol multi-column continuous system chromatography is used to separate acid and desalination, such as Figure 4 As shown, the removal rate of acid and salt is about 95%; yet, the method uses an asynchronous switching simulated moving bed device, and the requirements for switching valves and control systems are higher, and multiple sub-steps are needed to realize the variability of the number of chromatographic columns, and the operation steps and The system is relatively complex

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  • Method for purifying xylose hydrolysate through desalination by three-zone simulated moving bed
  • Method for purifying xylose hydrolysate through desalination by three-zone simulated moving bed
  • Method for purifying xylose hydrolysate through desalination by three-zone simulated moving bed

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Embodiment 1

[0032] A kind of three-zone simulated moving bed chromatographic desalination to purify the method of xylose hydrolyzate is as follows:

[0033] (1) Pretreatment of xylose hydrolyzate: corncobs were hydrolyzed with 0.5% (m / m) dilute hydrochloric acid for 1.5h at a temperature of 105°C and a working pressure of 0.15Mpa, and the obtained xylose hydrolyzate was neutralized to pH with calcium carbonate 5. Remove solid impurities and insolubles by precision filtration; the xylose filtrate is controlled at 60°C by a vacuum rotator, single-effect evaporator, or three-effect evaporator, etc., and evaporated and concentrated to obtain a refractive concentration of 55%, a conductivity of Sugar solution of 220000μS / m is used as raw material;

[0034] (2) Assembly and process design of the three-zone simulated moving bed chromatography device: between the eluent inlet and the extract outlet is zone I (extraction zone), between the extract solution outlet and raw material inlet is zone II ...

Embodiment 2

[0040] A kind of three-zone simulated moving bed chromatographic desalination to purify the method of xylose hydrolyzate is as follows:

[0041] (1) Pretreatment of xylose hydrolyzate: corncobs were hydrolyzed with 1.2% (m / m) dilute sulfuric acid for 1.5h at a temperature of 115°C and a working pressure of 0.1Mpa, and the obtained xylose hydrolyzate was neutralized with sodium hydroxide to pH 4.5, remove solid impurities and insolubles by precision filtration; xylose filtrate is controlled at 65°C by vacuum rotary instrument, single-effect evaporator, or three-effect evaporator, etc., evaporated and concentrated to obtain a refractive concentration of 60%, conductivity Sugar solution with a rate of 240000μS / m is used as raw material;

[0042] (2) Assembly and process design of the three-zone simulated moving bed chromatography device: between the eluent inlet and the extract outlet is zone I (extraction zone), between the extract solution outlet and raw material inlet is zone ...

Embodiment 3

[0048] A kind of three-zone simulated moving bed chromatographic desalination to purify the method of xylose hydrolyzate is as follows:

[0049] (1) Pretreatment of xylose hydrolyzate: corncobs were hydrolyzed with 1.5% (m / m) hydrochloric acid for 1.5h at a temperature of 120°C and a working pressure of 0.15Mpa, and the obtained xylose hydrolyzate was neutralized to pH 5.5 with sodium carbonate , to remove solid impurities and insolubles through precision filtration; the xylose filtrate is passed through a vacuum rotator, or a single-effect evaporator, or a three-effect evaporator to control the temperature at 70 ° C, evaporate and concentrate to obtain a refractive concentration of 50%, and a conductivity of 190000μS / m sugar liquid, as raw material;

[0050] (2) Assembly and process design of the three-zone simulated moving bed chromatography device: between the eluent inlet and the extract outlet is zone I (extraction zone), between the extract solution outlet and raw materi...

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Abstract

The invention discloses a method for purifying xylose hydrolysate through desalination by a three-zone simulated moving bed, belonging to the technical field of preparation and separation of functional sugar. According to the method provided by the invention, the xylose hydrolysate is used as an object; three-zone simulated moving bed chromatography is adopted to remove inorganic salt so as to purify the xylose hydrolysate; deionized water is used as an eluent; a working temperature is 50-70 DEG C; sodium type or calcium type strongly-acidic cationic resin is used as a chromatographic stationary phase; and thus, the conductivity of the xylose hydrolysate is greatly reduced, a part of color substances are removed at the same time, and a low loss rate of sugar components is kept. According to the method, inorganic salt can be removed to purify the xylose hydrolysate, an ion exchange desalination method is innovated, acid-base consumption and process wastewater yield are reduced, an xylose production process is simplified, subsequent concentration cost and production loss are reduced, and production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of functional sugar preparation and separation, and relates to a three-zone simulated moving bed desalination method for purifying xylose hydrolyzate. Background technique [0002] Carbohydrates are the main source of cellular energy and play an important role in cell construction, biosynthesis and regulation of life activities. As a kind of functional sugar with special effects in sugars, it has the functions of low calorie, providing nutrition, and promoting the improvement of human physiological functions. It is mainly represented by functional sugar alcohols, functional dietary fiber and functional oligosaccharides. It was originally used for nutrition. Health care and food industry, now it has been used in chemical, pharmaceutical, energy, petroleum and other non-food fields. [0003] At present, agricultural and forestry waste products such as corn cobs, straw and bagasse are mainly used to obtain pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 张军伟袁苗新贾彩敬
Owner JIANGNAN UNIV
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