CN-122012633-A - Process method for comprehensively treating corn steep water and obtaining myoethanol and potassium struvite

CN122012633ACN 122012633 ACN122012633 ACN 122012633ACN-122012633-A

Abstract

The invention relates to the technical field of corn soaking water treatment, in particular to a process method for comprehensively treating corn soaking water and obtaining myo-inositol and potassium struvite, which comprises the following steps of taking corn soaking water supernatant as a raw material, treating the corn soaking water supernatant by a first cation resin column and a first anion resin column, concentrating collected analytic solution, carrying out ultrasonic enzymolysis, decoloring and simulated moving bed chromatographic separation, and enabling an obtained inositol phase to enter a second cation resin column and a second anion resin column, concentrating, crystallizing and drying to obtain an inositol product; the above process method can obtain products of the myotonin and the potassium guanite, realize the recovery of phosphorus and potassium in the corn soaking water, avoid the waste of resources, reduce the consumption of the resolving agent (potassium chloride) and save the cost.

Inventors

ZHU LIPING
HE DONGSHENG
CUI XIN
LIU HAO
CHENG SHUANGWU
LI PING
GE XUEJUN
LI XIAOQING
CAO XINXIN

Assignees

诸城市浩天药业有限公司

Dates

Publication Date: 20260512
Application Date: 20260131

Claims (8)

1. A process for comprehensively treating corn steep water and obtaining myoethanol and potassium struvite, which is characterized by comprising the following steps: (1) Allowing supernatant liquid obtained after standing and settling of the corn soaking water to pass through a first cationic resin column, allowing collected effluent liquid to enter a first anionic resin column, resolving by adopting potassium chloride solution after feeding is finished, and collecting resolved liquid for later use; (2) Taking the analysis liquid in the step (1), regulating the pH value of the concentrated liquid collected by concentration treatment to be acidic, Firstly adding a chelating agent, stirring and mixing, then adding phytase, heating and performing ultrasonic enzymolysis reaction to obtain enzymolysis feed liquid for later use; (3) Taking the enzymolysis feed liquid in the step (2), decoloring, and filtering to obtain decolored liquid for later use; (4) Separating the decolorized solution obtained in the step (3) by adopting a simulated moving bed chromatographic separation system, wherein the obtained inositol phase and salt phase are respectively reserved; (5) Taking the inositol phase in the step (4), and introducing the inositol phase into a second cation resin column and a second anion resin column which are connected in series, and concentrating, crystallizing and drying the obtained effluent to obtain an inositol product; (6) Adding magnesium chloride hexahydrate into the salt phase obtained in the step (4), adjusting the pH value to be alkaline, stirring and mixing, filtering and collecting filtrate for standby, and drying the collected precipitate to obtain a potassium guanite product; (7) And (3) concentrating, crystallizing and filtering the filtrate in the step (6), carrying out bipolar membrane electrodialysis on the crystallized mother liquor to obtain hydrochloric acid and potassium hydroxide solution respectively, eluting the first cationic resin column in the step (1) and the second cationic resin column in the step (5) by using hydrochloric acid, wherein potassium chloride obtained by concentrating, crystallizing and drying the eluent collected when the hydrochloric acid elutes the first cationic resin is used as a plant acid analysis agent, combining the eluent collected when the hydrochloric acid elutes the second cationic resin column with the filtrate in the step (6), and combining the collected eluent with the salt in the step (4) by using the potassium hydroxide solution for eluting the second anionic resin column in the step (5).
2. The process for comprehensively treating corn steep water and obtaining myo-inositol and potassium struvite according to claim 1, wherein in step (1), the supernatant enters a first cationic resin column at a flow rate of 1.5-2Bv/h, the effluent enters a first anionic resin column at a flow rate of 1.5-2Bv/h, the concentration of the potassium chloride solution is 12wt%, and the potassium chloride solution enters the first anionic resin column at a flow rate of 0.5-1 Bv/h.
3. The process method for comprehensively treating corn steep water and obtaining myo-inositol and potassium struvite according to claim 1, wherein in the step (2), nanofiltration membrane with a molecular weight cut-off of 300-500Da is adopted for concentration treatment, potassium hydroxide solution is adopted for regulating pH of concentrated solution to 4.5-5, chelating agent comprises tetra sodium glutamate diacetate and poly amino polyether methylene phosphonic acid, the adding amount of tetra sodium glutamate diacetate is 0.15-0.3g/L, the adding amount of poly amino polyether methylene phosphonic acid is 0.2-0.4ml/L, heating is carried out to 50-60 ℃, ultrasonic enzymolysis treatment is carried out for 4-6h, and the power of ultrasonic treatment is 300-500w.
4. The process method for comprehensively treating corn steep water and obtaining myoethanol and potassium struvite according to claim 1, wherein activated carbon is added into the enzymolysis feed liquid in the step (3) for decoloring treatment, and the decoloring liquid is concentrated in vacuum, so that the solid content of the obtained concentrated feed liquid is 40-45wt%.
5. The process for comprehensively treating corn steep water and obtaining myo-inositol and potassium struvite according to claim 1, wherein in step (4), the separation conditions are adopted in the separation by a simulated moving bed chromatographic separation system, wherein the operation temperature is 55-65 ℃, the pressure is 3-0.6Mpa, the feeding flow rate of decolorized solution is 0.5Bv/h, and the flow rate of mobile phase is 1Bv/h.
6. The process for the integrated treatment of corn steep water and obtaining myo-inositol and potassium struvite according to claim 1, wherein said inositol phase in step (5) is fed to a second cationic resin column and a second anionic resin column at a flow rate of 1-1.5 Bv/h.
7. The process for comprehensively treating corn steep water and obtaining myo-inositol and potassium struvite according to claim 1, wherein in step (6) the salt phase and the magnesium chloride hexahydrate are added in a ratio of 80-120g/L, and the pH is adjusted to 8.0-10.0.
8. The process for the integrated treatment of corn steep water and obtaining myo-inositol and potassium struvite according to claim 1, wherein hydrochloric acid in step (7) is used to elute the first cationic resin column of step (1) and the second cationic resin column of step (5) at a concentration of 5wt%.

Description

Process method for comprehensively treating corn steep water and obtaining myoethanol and potassium struvite Technical Field The invention relates to the technical field of corn soaking water treatment, in particular to a process method for comprehensively treating corn soaking water and obtaining myoethanol and potassium struvite. Background The corn soaking water is leftovers produced in the process of producing corn starch by a wet method, and contains rich phosphorus, potassium, magnesium, phytic acid and other components; at present, when corn steep water is treated, the cationic and anionic resin columns are mainly used for treatment, adsorbed phytic acid is resolved, then the potassium phytate solution is subjected to high-temperature hydrolysis, and the obtained hydrolysate is subjected to subsequent treatment to obtain inositol products, but the potassium magnesium ions are not recycled in the existing treatment process to prepare potassium struvite products, and the regenerated waste liquid generated by the regeneration treatment of the cationic resin columns and the anionic resin columns is not recycled, so that resource waste is caused, therefore, aiming at the technical problems, a process method for comprehensively treating the corn steep water and obtaining myotonin and potassium struvite is necessary to be developed. Disclosure of Invention The technical problems to be solved by the invention are as follows: aiming at the defects of the prior art, a process method for comprehensively treating corn soaking water and obtaining myo-inositol and potassium struvite is provided, and inositol products and potassium struvite products can be obtained by using the process method, so that the effective recovery of phosphorus and potassium is realized in the whole process, the resource waste is avoided, and the consumption of a resolving agent (potassium chloride) is reduced. In order to solve the technical problems, the technical scheme of the invention is as follows: a process for comprehensively treating corn steep water and obtaining myo-inositol and potassium struvite, the process comprising the steps of: (1) Allowing supernatant liquid obtained after standing and settling of the corn soaking water to pass through a first cationic resin column, allowing collected effluent liquid to enter a first anionic resin column, resolving by adopting potassium chloride solution after feeding is finished, and collecting resolved liquid for later use; (2) Taking the analysis liquid in the step (1), regulating the pH value of the concentrated liquid collected by concentration treatment to be acidic, Firstly adding a chelating agent, stirring and mixing, then adding phytase, heating and performing ultrasonic enzymolysis reaction to obtain enzymolysis feed liquid for later use; (3) Taking the enzymolysis feed liquid in the step (2), decoloring, and filtering to obtain decolored liquid for later use; (4) Separating the decolorized solution obtained in the step (3) by adopting a simulated moving bed chromatographic separation system, wherein the obtained inositol phase and salt phase are respectively reserved; (5) Taking the inositol phase in the step (4), and introducing the inositol phase into a second cation resin column and a second anion resin column which are connected in series, and concentrating, crystallizing and drying the obtained effluent to obtain an inositol product; (6) Adding magnesium chloride hexahydrate into the salt phase obtained in the step (4), adjusting the pH value to be alkaline, stirring and mixing, filtering and collecting filtrate for standby, and drying the collected precipitate to obtain a potassium guanite product; (7) And (3) concentrating, crystallizing and filtering the filtrate in the step (6), carrying out bipolar membrane electrodialysis on the crystallized mother liquor to obtain hydrochloric acid and potassium hydroxide solution respectively, eluting the first cationic resin column in the step (1) and the second cationic resin column in the step (5) by using hydrochloric acid, wherein potassium chloride obtained by concentrating, crystallizing and drying the eluent collected when the hydrochloric acid elutes the first cationic resin is used as a plant acid analysis agent, combining the eluent collected when the hydrochloric acid elutes the second cationic resin column with the filtrate in the step (6), and combining the collected eluent with the salt in the step (4) by using the potassium hydroxide solution for eluting the second anionic resin column in the step (5). As an improved technical scheme, the supernatant in the step (1) enters a first cationic resin column at a flow rate of 1.5-2Bv/h, the effluent enters a first anionic resin column at a flow rate of 1.5-2Bv/h, the concentration of the potassium chloride solution is 12wt%, and the potassium chloride solution enters the first anionic resin column at a flow rate of 0.5-1 Bv/h. As an improved technical scheme, a nanofil