CN114260028A - Method and device for decoloring sodium glutamate feed liquid - Google Patents
Method and device for decoloring sodium glutamate feed liquid Download PDFInfo
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- CN114260028A CN114260028A CN202111611128.8A CN202111611128A CN114260028A CN 114260028 A CN114260028 A CN 114260028A CN 202111611128 A CN202111611128 A CN 202111611128A CN 114260028 A CN114260028 A CN 114260028A
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Abstract
The invention provides a method and a device for decoloring sodium glutamate feed liquid, and belongs to the technical field of sodium glutamate production. The invention adopts the continuous ion-exchange method to carry out resin decolorization on the sodium glutamate feed liquid, can adopt a continuous ion-exchange system to divide a feeding system into a stock solution decolorization area, a primary decolorization area and a secondary decolorization area, can simultaneously carry out continuous decolorization treatment on three strands of materials to achieve the purpose of three-in-one decolorization function, finally, the stock solution, the primary decolorization area and the secondary decolorization area all achieve qualified transmittance after resin decolorization, and enter a subsequent crystallization process to produce the sodium glutamate product. The content of pigment in the monosodium glutamate stock solution and the mother solution treated by the resin column is reduced, and the light transmittance is improved.
Description
Technical Field
The invention relates to the technical field of sodium glutamate production, in particular to a method and a device for decoloring sodium glutamate feed liquid.
Background
The existing production process of monosodium glutamate is to obtain glutamic acid by yeast fermentation, then obtain glutamic acid crystals by isoelectric crystallization, obtain monosodium glutamate neutralization stock solution by alkali neutralization, decolor the monosodium glutamate neutralization stock solution by powdered activated carbon, decolor and refine the monosodium glutamate neutralization stock solution by a granular carbon column, and then enter a subsequent crystallization process to obtain a finished monosodium glutamate product.
At present, the pigment in the monosodium glutamate neutralization stock solution is mainly weak acid organic pigment, has the characteristic of large molecular weight, is mainly formed by high-temperature treatment of starch, bran water, corn steep liquor, waste molasses and the like, and if the pigment is not removed, the color of a monosodium glutamate product is influenced. The monosodium glutamate products in the market show the phenomenon of yellow color in different color grades, namely, the phenomenon is caused by poor decolorization and deferrization. The existing decoloring process is to adopt powdered activated carbon to stir and decolor in a decoloring tank, then to adopt plate-and-frame filtration to remove the powdered activated carbon, to adopt the powdered activated carbon (decoloring temperature: 55 ℃ +/-5 ℃, pH: 6.7-7.2, stirring time: 30-40 min) to remove most impurities and pigments, then to enter a granular carbon column, to adopt K-15 granular carbon to decolor for the second time, so as to ensure the quality of the sodium glutamate solution (using 722 spectrophotometer with wavelength lambda being 420, bottom color dish being 3cm to detect light transmission). However, the primary crystallization mother liquor obtained by crystallization after a complete decolorization process (powdered activated carbon decolorization + granular carbon decolorization) is poor in quality, the primary crystallization mother liquor still needs to be subjected to powdered activated carbon decolorization by another set of decolorization system and then is subjected to granular carbon column decolorization and then is recycled to the crystallization process, and the secondary mother liquor remaining after primary mother liquor crystallization also needs to be subjected to powdered activated carbon decolorization and then is recycled to the crystallization process after being subjected to granular carbon column decolorization. However, although the activated carbon decoloring process is a traditional effective decoloring means, the workshop production environment is severe due to the use of a large amount of powdered carbon, the personnel operation difficulty is high, and the carbon consumption cost is high; and the secondary decolorization treatment capacity of the granular carbon column is low, generally only 50BV, the mother liquor may only be 30BV, the activated carbon needs to be regenerated by hot alkali, a large amount of steam and rinsing water needs to be consumed, the energy consumption is high, a large amount of waste water is generated, and the decolorization effect is poor.
Disclosure of Invention
The invention aims to provide a method and a device for decoloring sodium glutamate feed liquid, wherein the method has excellent decoloring effect.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for decoloring sodium glutamate feed liquid, which comprises the following steps:
carrying out resin decolorization on the sodium glutamate feed liquid by adopting a continuous ion exchange method to obtain a resin lower column feed liquid; the sodium glutamate feed liquid comprises a sodium glutamate stock solution, a first mother solution of sodium glutamate and a second mother solution of sodium glutamate; the sodium glutamate stock solution, the sodium glutamate first mother solution and the sodium glutamate second mother solution are divided into three materials and are simultaneously subjected to resin decoloration in parallel;
the resin used for resin decoloration is a Dow ion exchange resin.
Preferably, the sodium glutamate stock solution is a filtrate obtained by sequentially decoloring sodium glutamate fermentation liquor by using powdered activated carbon and filtering by using a plate frame; the first mother liquor of sodium glutamate is mother liquor obtained by sequentially decoloring sodium glutamate stock solution by using powdered activated carbon and granular carbon and then carrying out first crystallization; and the second mother liquor of sodium glutamate is obtained by carrying out second crystallization on the first mother liquor of sodium glutamate after sequentially carrying out powdered activated carbon decolorization and granular carbon decolorization.
Preferably, the dow ion exchange resin is a trimethylamine type macroporous anion exchange resin.
Preferably, in the resin decoloring process, the resin filling amount is 75-85%.
Preferably, the temperature for decoloring the resin is 35-45 ℃.
Preferably, when the resin is decolorized, the volume ratio of the feeding liquid to the resin is (30-400): 1.
Preferably, the continuous ion exchange system used in the continuous ion exchange method comprises six resin column functional areas, wherein the six resin column functional areas comprise an adsorption area, a material washing area, a backwashing area, a secondary regeneration area, a regeneration area and a regeneration rinsing area.
Preferably, before the resin decolorization, the method further comprises the step of performing microfiltration on the sodium glutamate feed liquid; the precision of the precision filtration is 1-20 mu m.
The invention provides a device for decoloring sodium glutamate feed liquid, which comprises a stock solution feeding buffer tank, a first mother solution feeding buffer tank, a second mother solution feeding buffer tank, a stock solution conveying pump, a first mother solution conveying pump, a second mother solution conveying pump, a stock solution resin column, a first mother solution resin column, a second mother solution resin column, a lower column stock solution collecting tank, a first lower column mother solution collecting tank and a second lower column mother solution collecting tank, wherein the stock solution feeding buffer tank is connected with the first mother solution feeding buffer tank; the stock solution feeding buffer tank, the stock solution delivery pump, the stock solution resin column and the lower column stock solution collecting tank are sequentially connected; the first mother liquor feeding buffer tank, the first mother liquor delivery pump, the first mother liquor resin column and the first lower column mother liquor collecting tank are sequentially connected; and the second mother liquor feeding buffer tank, the second mother liquor delivery pump, the second mother liquor resin column and the second lower column mother liquor collecting tank are sequentially connected.
The invention provides a method for decoloring by using the sodium glutamate feed liquid decoloring device, which comprises the following steps:
collecting a sodium glutamate stock solution in a stock solution feeding buffer tank, conveying the stock solution into a stock solution resin column through a stock solution conveying pump, performing first resin decoloration, and collecting the obtained lower column stock solution of the resin in a lower column stock solution collecting tank; meanwhile, collecting the first mother liquor of sodium glutamate into a first mother liquor feeding buffer tank, conveying the first mother liquor into a first mother liquor resin column through a first mother liquor conveying pump, decoloring the second resin, and collecting the mother liquor of the obtained lower resin column into a first lower column mother liquor collecting tank; meanwhile, collecting the second mother liquor of sodium glutamate into a second mother liquor feeding buffer tank, conveying the second mother liquor into a second mother liquor resin column through a second mother liquor conveying pump, decoloring a third resin, and collecting the obtained resin lower column mother liquor into a second lower column mother liquor collecting tank.
The invention provides a method for decoloring sodium glutamate feed liquid, wherein the sodium glutamate feed liquid is subjected to resin decoloring by adopting a continuous ion-exchange method, a feeding system can be divided into a stock solution decoloring area, a primary decoloring area and a secondary decoloring area by adopting a continuous ion-exchange system, three strands of materials can be subjected to continuous decoloring treatment simultaneously to achieve the purpose of three-in-one decoloring function, and finally the stock solution, the primary and the secondary decoloration reach qualified transmittance after resin decoloring, and then the stock solution, the primary and the secondary decoloration reach the qualified transmittance, and the product of sodium glutamate is produced by entering a subsequent crystallization process. The content of pigment in the monosodium glutamate stock solution and the mother solution treated by the resin column is reduced, and the light transmittance is improved.
Compared with the prior art, the resin decoloring method has the following beneficial effects:
the decoloring effect of the sodium glutamate stock solution can basically reach more than 90 percent, is higher than the decoloring effect of the existing granular carbon column, and ensures the product quality; the first mother and the second mother can be matched and adjusted according to the actual production proportion, the material change is flexibly adapted, and the decoloring effect is basically equivalent to that of granular carbon; compared with the existing fixed carbon column system, the continuous ion exchange method has stronger adsorption capacity, enhances the resin treatment capacity per unit volume by more than 5 times, improves the resin utilization rate, reduces about 80 percent of resin consumption, saves more than 75 percent of water consumption, and reduces more than 70 percent of wastewater discharge; the continuous ion exchange system automatically operates for 24 hours continuously, and automatically and continuously regenerates, so that a large amount of resin can be saved, a large amount of regenerant consumption can be saved, a large amount of sewage discharge can be reduced, a large amount of manual operation can be saved, the discharge of feed liquid is stable, and the influence on the post-process is small; the occupied area is small, the occupied area of the continuous ion exchange system is about 1/9 of that of the fixed carbon column system, and a large amount of construction cost of the delivery room is saved.
By adopting the method, the light transmittance of the sodium glutamate stock solution is more than or equal to 60 percent, the pH value is 6.2-7.0, the content of sodium glutamate in the product is 51-53 percent, the light transmittance is more than or equal to 85 percent after resin decoloration is carried out, and the decoloring capacity reaches 200-300 BV; the light transmittance of the fed primary sodium glutamate mother liquor is more than or equal to 40%, the pH value is 6.2-7.0, the content of sodium glutamate in the product is 52-53.5%, the light transmittance after decolorization is more than or equal to 55%, and the decolorization capacity reaches 100-150 BV; the light transmittance of the sodium glutamate secondary mother liquor is more than or equal to 35%, the pH value is 6.2-7.0, the content of sodium glutamate in the product is 52.7-52.8%, the light transmittance after decolorization is more than or equal to 45%, and the decolorization capacity reaches 100-150 BV.
Drawings
FIG. 1 is a schematic view of a continuous ion-exchange system used in the sodium glutamate solution decoloring device of the present invention.
Detailed Description
The invention provides a method for decoloring sodium glutamate feed liquid, which comprises the following steps:
carrying out resin decolorization on the sodium glutamate feed liquid by adopting a continuous ion exchange method to obtain a resin lower column feed liquid; the sodium glutamate feed liquid comprises a sodium glutamate stock solution, a first mother solution of sodium glutamate and a second mother solution of sodium glutamate; the sodium glutamate stock solution, the sodium glutamate first mother solution and the sodium glutamate second mother solution are divided into three materials and are simultaneously subjected to resin decoloration in parallel;
the resin used for resin decoloration is a Dow ion exchange resin.
In the present invention, reagents or equipment required are commercially available products well known to those skilled in the art unless otherwise specified.
The invention adopts a continuous ion-exchange method to carry out resin decolorization on sodium glutamate feed liquid to obtain resin column feed liquid. In the invention, the sodium glutamate feed liquid comprises sodium glutamate stock solution, sodium glutamate first mother solution and sodium glutamate second mother solution. In the invention, the sodium glutamate stock solution is a filtrate obtained by sequentially decoloring sodium glutamate neutralization solution by using powdered activated carbon and filtering by using a plate frame; the first mother liquor of sodium glutamate is mother liquor obtained by sequentially decoloring sodium glutamate stock solution by using powdered activated carbon and granular carbon and then carrying out first crystallization; and the second mother liquor of sodium glutamate is obtained by carrying out second crystallization on the first mother liquor of sodium glutamate after sequentially carrying out powdered activated carbon decolorization and granular carbon decolorization. The process for obtaining the sodium glutamate stock solution, the sodium glutamate first mother solution and the sodium glutamate second mother solution is not particularly limited, and the sodium glutamate stock solution, the sodium glutamate first mother solution and the sodium glutamate second mother solution can be obtained in a manner well known in the art. The composition of the sodium glutamate stock solution, the sodium glutamate first mother solution and the sodium glutamate second mother solution is not particularly limited, and the corresponding feed liquid with the composition can be obtained according to a method well known in the art. In the embodiment of the invention, the sodium glutamate stock solution is specifically a filtrate obtained by decoloring sodium glutamate neutralization solution in the process of producing monosodium glutamate by a concentration isoelectric method and filtering the sodium glutamate neutralization solution by powdered activated carbon and a plate-frame filter. The source and the obtaining process of the sodium glutamate neutralizing solution are not particularly limited in the invention, and the sodium glutamate neutralizing solution can be obtained according to the processes well known in the field.
In the present invention, before the resin decolorization, the method preferably further comprises the step of subjecting the sodium glutamate solution to microfiltration; the precision of the precise filtration is preferably 1-20 μm, and more preferably 5 μm. The specific process of the microfiltration is not particularly limited in the present invention and may be performed according to a process known in the art. The invention removes visible particles in the sodium glutamate feed liquid by precise filtration, reduces the turbidity of the feed liquid to be close to zero, and prevents the feed liquid from damaging an ion exchange system in the resin adsorption process. The apparatus used for the microfiltration is not particularly limited, and a microfiltration apparatus well known in the art, such as a bag type microfiltration apparatus or a fusion casting type microfiltration apparatus, may be used.
In the present invention, the DOW ion exchange resin is preferably a trimethylamine type macroporous anion exchange resin, more preferably a styrene type macroporous anion exchange resin or an acrylic type macroporous anion exchange resin, and more preferably CROSSION 21 resin of DOW corporation. The ion exchange resin of the present invention has excellent adsorption performance, and can adsorb pigment, protein and other impurity from the material liquid while other effective components enter the lower column liquid.
In the resin decoloring process, the resin filling amount in the resin column is preferably 75-85%, and the resin decoloring temperature is preferably 35-45 ℃, and more preferably 41-44 ℃. In the present invention, when the resin is decolorized, the ratio of the volume of the feed liquid to the volume of the resin is preferably (30-400): 1, and more preferably 130: 1.
In the present invention, as shown in fig. 1, the continuous interchange system used in the continuous interchange method comprises 30 resin columns, wherein the 30 resin columns are placed on a rotating turntable and switched by a rotating multi-way valve; the 30 resin columns are preferably divided into six functional zones: the device comprises an adsorption zone, a material washing zone, a backwashing zone, a regeneration zone, a secondary regeneration zone and a rinsing zone, wherein the six functional zones respectively execute corresponding processes, feed liquid and a resin regenerant continuously enter a continuous ion exchange system, and decolored product liquid and waste liquid are continuously discharged out of the system, so that continuous production and online automatic regeneration effects are realized.
In the invention, an adsorption zone is a feed liquid decolorization zone, and the adsorption zone comprises a stock solution decolorization zone and a mother solution decolorization zone; when resin decolorization is carried out, the stock solution decolorization area firstly contacts a fresh resin column for decolorization, so that the stock solution is qualified, and the quality of sodium glutamate products produced in a workshop is ensured; then the resin column enters a mother liquor decoloring area, the residual adsorption capacity of the resin is used for decoloring the mother liquor, the mother liquor decoloring is qualified, and the resin saturation after passing through the mother liquor decoloring area reaches more than 95%; the mother liquor decoloring area comprises a first mother liquor decoloring area (primary mother) and a second mother liquor decoloring area (secondary mother), the feeding amount of different decoloring areas can be flexibly adjusted in the actual production process, and the light transmittance of the stock solution decolored by the adsorption area is more than or equal to 85 percent; the light transmission of one mother is more than or equal to 55 percent; the light transmission of the second mother is more than or equal to 45 percent. The resin saturated by adsorption in the adsorption zone enters a material washing zone, top washing is carried out by water, and the ejected mother liquor returns to a mother liquor tank for further decolorization to ensure the qualification; the resin column with the top material enters a backwashing area for backwashing, and gas backwashing and large-amount water backwashing are adopted to discharge pollutants such as protein and the like remained in the resin column so as to prevent hardening of the resin; the resin column after the back washing enters a secondary regeneration area and a regeneration area, and a regenerant is adopted for multi-stage continuous regeneration; and the resin with the regenerated and recovered performance enters a rinsing area to be rinsed clean by water, and enters the next production cycle after the condition of secondary feeding is met. The regenerating agent is not particularly limited in the present invention, and any regenerating agent known in the art may be used. The specific operation of the continuous ion-exchange system is not particularly limited in the present invention, and the operation can be performed according to the procedures well known in the art.
The invention provides a device for decoloring sodium glutamate feed liquid, which comprises a stock solution feeding buffer tank, a first mother solution feeding buffer tank, a second mother solution feeding buffer tank, a stock solution conveying pump, a first mother solution conveying pump, a second mother solution conveying pump, a stock solution resin column, a first mother solution resin column, a second mother solution resin column, a lower column stock solution collecting tank, a first lower column mother solution collecting tank and a second lower column mother solution collecting tank, wherein the stock solution feeding buffer tank is connected with the first mother solution feeding buffer tank; the stock solution feeding buffer tank, the stock solution delivery pump, the stock solution resin column and the lower column stock solution collecting tank are sequentially connected; the first mother liquor feeding buffer tank, the first mother liquor delivery pump, the first mother liquor resin column and the first lower column mother liquor collecting tank are sequentially connected; and the second mother liquor feeding buffer tank, the second mother liquor delivery pump, the second mother liquor resin column and the second lower column mother liquor collecting tank are sequentially connected.
The raw liquid feeding buffer tank, the first mother liquid feeding buffer tank, the second mother liquid feeding buffer tank, the raw liquid delivery pump, the first mother liquid delivery pump, the second mother liquid delivery pump, the lower column raw liquid collection tank, the first lower column mother liquid collection tank and the second lower column mother liquid collection tank are not limited in particular, and the raw liquid feeding buffer tank, the first mother liquid feeding buffer tank, the second mother liquid feeding buffer tank, the lower column raw liquid collection tank, the first lower column mother liquid collection tank and the second lower column mother liquid collection tank are well known in the art.
In the invention, the stock solution resin column, the first mother solution resin column and the second mother solution resin column constitute 30 resin columns of the continuous interchange system.
The device for decoloring the sodium glutamate feed liquid further comprises a regeneration liquid tank, a regeneration liquid pump, a water pump and a pure water tank; the regeneration liquid tank is connected with the regeneration liquid pump and is used for configuring and providing a regenerant required by resin regeneration; the pure water tank is connected with the water pump and is used for providing clean water sources required by the material washing area and the rinsing area; the pure water tank is used for cleaning regenerated resin and is reused. In the present invention, the resin regenerant is preferably a saline-alkali solution, and more preferably a mixed aqueous solution of 10 mass% NaCl and 0.2 mass% NaOH. In the invention, the resin regeneration waste liquid is preferably recycled after being treated in a biochemical treatment system or being purified.
The invention provides a method for decoloring by using the sodium glutamate feed liquid decoloring device, which comprises the following steps:
collecting a sodium glutamate stock solution in a stock solution feeding buffer tank, conveying the stock solution into a stock solution resin column through a stock solution conveying pump, performing first resin decoloration, and collecting the obtained lower column stock solution of the resin in a lower column stock solution collecting tank; meanwhile, collecting the first mother liquor of sodium glutamate into a first mother liquor feeding buffer tank, conveying the first mother liquor into a first mother liquor resin column through a first mother liquor conveying pump, decoloring the second resin, and collecting the mother liquor of the obtained lower resin column into a first lower column mother liquor collecting tank; meanwhile, collecting the second mother liquor of sodium glutamate into a second mother liquor feeding buffer tank, conveying the second mother liquor into a second mother liquor resin column through a second mother liquor conveying pump, decoloring a third resin, and collecting the obtained resin lower column mother liquor into a second lower column mother liquor collecting tank.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, the types of the resin columns used were all Crosson 21 resin from DOW, and the resin packing amount in the resin columns was 80%.
Example 1
1) Collecting sodium glutamate neutralized liquid in the process of producing monosodium glutamate by a certain monosodium glutamate factory in inner Mongolia through a concentration isoelectric method, sequentially performing powdered carbon decolorization and plate-and-frame filtration to obtain sodium glutamate stock solution, performing concentration crystallization and separation on the sodium glutamate stock solution, and performing powdered carbon decolorization and plate-and-frame filtration to obtain a first mother solution of sodium glutamate; concentrating and crystallizing the first mother liquor of sodium glutamate, separating, and filtering by a powdered carbon decolorizing plate frame to obtain a second mother liquor of sodium glutamate; the light transmittance of the sodium glutamate stock solution is 66%, the pH value is 6.5, and the mass content of the sodium glutamate is 52%; the light transmittance of the first sodium glutamate mother liquor is 45%, the pH value is 6.8, and the mass content of sodium glutamate in the product is 52.5%; the light transmittance of the sodium glutamate second mother liquor is 35%, the pH value is 6.6, and the mass content of the sodium glutamate in the product is 52.8%;
2) performing precise filtration (the precision is 5 mu m) on the sodium glutamate stock solution obtained in the step 1) to reduce the turbidity to be close to zero, then feeding the sodium glutamate stock solution into a stock solution feeding buffer tank, conveying the sodium glutamate stock solution into a stock solution resin column through a stock solution conveying pump to perform resin decoloration, wherein the operating temperature of the resin decoloration is 42 ℃, and operating until the ratio of the volume of the feeding solution to the volume of the filled resin is more than 130 to obtain a stock solution of a lower resin column; precisely filtering the first mother liquor of sodium glutamate obtained in the step 1) (the precision is 5 mu m), enabling the turbidity to be reduced to zero, then feeding the first mother liquor into a first mother liquor feeding buffer tank, conveying the first mother liquor into a first mother liquor resin column through a first mother liquor conveying pump for resin decoloration, wherein the resin decoloration operation temperature is 42 ℃, when the ratio of the volume of the feeding liquor to the volume of the filled resin is more than 130, obtaining first mother liquor of a resin lower column, and feeding the first mother liquor into a first lower column mother liquor collecting tank; precisely filtering the sodium glutamate second mother liquor obtained in the step 1) (the precision is 5 mu m), enabling the turbidity to be reduced to zero, then feeding the sodium glutamate second mother liquor into a second mother liquor feeding buffer tank, conveying the sodium glutamate second mother liquor into a second mother liquor resin column through a second mother liquor conveying pump for resin decoloration, wherein the resin decoloration operation temperature is 42 ℃, when the ratio of the feeding liquor volume to the filling resin volume is larger than 130:1, obtaining a second mother liquor of a lower resin column, and feeding the second mother liquor into a second lower column mother liquor collecting tank;
and after the resin is decolorized, regenerating the used resin, wherein the regenerant is a mixed aqueous solution of 10 mass percent of NaCl and 0.2 mass percent of NaOH, and recycling the regenerated resin.
The light transmittance of the resin lower column stock solution and the resin lower column mother solution is detected in a base color dish with the wavelength lambda of 420 and 3cm by adopting a 722 spectrophotometer, and the result shows that the light transmittance of the resin lower column stock solution is 94 percent and the light transmittance of the resin lower column mother solution is 68 percent; the light transmittance of the second resin column mother liquor is 52%.
The yield of sodium glutamate obtained in this example was 99.4%.
Example 2
1) Collecting sodium glutamate neutralized liquid in the process of producing monosodium glutamate by a monosodium glutamate factory in inner Mongolia through concentration and other electric methods, sequentially performing powdered carbon decolorization and plate-and-frame filtration to obtain sodium glutamate stock solution, separating the sodium glutamate stock solution after concentration and crystallization, and performing powdered carbon decolorization and plate-and-frame filtration to obtain a first mother solution of sodium glutamate; concentrating and crystallizing the first mother liquor of sodium glutamate, separating, and filtering by a powdered carbon decolorizing plate frame to obtain a second mother liquor of sodium glutamate; the light transmittance of the sodium glutamate stock solution is 64 percent, the pH value is 6.4, and the mass content of the sodium glutamate is 51.5 percent; the light transmittance of the first sodium glutamate mother liquor is 45.6%, the pH value is 6.7, the mass content of sodium glutamate is 53.5%, the light transmittance of the second sodium glutamate mother liquor is 37.5%, the pH value is 6.7, and the mass content of sodium glutamate in the product is 52.8%;
2) performing precise filtration (the precision is 5 mu m) on the sodium glutamate stock solution obtained in the step 1) to reduce the turbidity to be close to zero, then feeding the sodium glutamate stock solution into a stock solution feeding buffer tank, conveying the sodium glutamate stock solution into a stock solution resin column through a stock solution conveying pump to perform resin decoloration, wherein the resin decoloration operation temperature is 44 ℃, and when the ratio of the volume of the feeding solution to the volume of the filled resin is larger than 130, obtaining a stock solution of a lower resin column; performing precise filtration (with the precision of 5 mu m) on the first mother liquor of sodium glutamate obtained in the step 1), enabling the turbidity to be reduced to zero, then feeding the first mother liquor into a first mother liquor feeding buffer tank, conveying the first mother liquor into a first mother liquor resin column through a first mother liquor conveying pump for resin decoloration, wherein the resin decoloration operation temperature is 44 ℃, when the ratio of the volume of the feeding liquor to the volume of the filled resin is larger than 130, obtaining first mother liquor of a resin lower column, and feeding the first mother liquor into a first lower column mother liquor collecting tank; precisely filtering the sodium glutamate second mother liquor obtained in the step 1) (the precision is 5 mu m), enabling the turbidity to be reduced to zero, then feeding the sodium glutamate second mother liquor into a second mother liquor feeding buffer tank, conveying the sodium glutamate second mother liquor into a second mother liquor resin column through a second mother liquor conveying pump for resin decoloration, wherein the resin decoloration operation temperature is 42 ℃, when the ratio of the feeding liquor volume to the filling resin volume is larger than 130:1, obtaining a second mother liquor of a lower resin column, and feeding the second mother liquor into a second lower column mother liquor collecting tank;
and after the decolorization is finished, regenerating the used resin, wherein the regenerant is a mixed aqueous solution of 10 mass percent of NaCl and 0.2 mass percent of NaOH, and recycling the regenerated resin.
The light transmittance of the obtained resin column-below stock solution was 95%, and the light transmittance of the resin column-below mother solution was 72.3%; the light transmittance of the second resin column mother liquor was 47.5%.
The yield of sodium glutamate obtained in this example was 99.6%.
Example 3
1) Collecting sodium glutamate neutralized liquid in the process of producing monosodium glutamate by a monosodium glutamate factory in inner Mongolia through concentration and other electric methods, sequentially performing powdered carbon decolorization and plate-and-frame filtration to obtain sodium glutamate stock solution, separating the sodium glutamate stock solution after concentration and crystallization, and performing powdered carbon decolorization and plate-and-frame filtration to obtain a first mother solution of sodium glutamate; concentrating and crystallizing the first mother liquor of sodium glutamate, separating, and filtering by a powdered carbon decolorizing plate frame to obtain a second mother liquor of sodium glutamate; the light transmittance of the sodium glutamate stock solution is 68%, the pH value is 6.2, and the mass content of the sodium glutamate is 52.5%; the light transmittance of the first sodium glutamate mother liquor is 47%, the pH value is 6.8, the mass content of sodium glutamate is 52%, the light transmittance of the second sodium glutamate mother liquor is 38%, the pH value is 6.8, and the mass content of sodium glutamate in the product is 52.7%;
2) performing precise filtration (the precision is 5 mu m) on the sodium glutamate stock solution obtained in the step 1) to reduce the turbidity to be close to zero, then feeding the sodium glutamate stock solution into a stock solution feeding buffer tank, conveying the sodium glutamate stock solution into a stock solution resin column through a stock solution conveying pump to perform resin decoloration, wherein the operating temperature of the resin decoloration is 41 ℃, and operating until the ratio of the volume of the feeding solution to the volume of the filled resin is more than 130 to obtain a stock solution of a lower resin column; performing precise filtration (with the precision of 5 mu m) on the first mother liquor of sodium glutamate obtained in the step 1), enabling the turbidity to be reduced to zero, then feeding the first mother liquor into a first mother liquor feeding buffer tank, conveying the first mother liquor into a first mother liquor resin column through a first mother liquor conveying pump for resin decoloration, wherein the resin decoloration operation temperature is 41 ℃, when the ratio of the volume of the feeding liquor to the volume of the filled resin is larger than 130, obtaining first mother liquor of a resin lower column, and feeding the first mother liquor into a first lower column mother liquor collecting tank; precisely filtering the sodium glutamate second mother liquor obtained in the step 1) (the precision is 5 mu m), enabling the turbidity to be reduced to zero, then feeding the sodium glutamate second mother liquor into a second mother liquor feeding buffer tank, conveying the sodium glutamate second mother liquor into a second mother liquor resin column through a second mother liquor conveying pump for resin decoloration, wherein the resin decoloration operation temperature is 41 ℃, when the ratio of the feeding liquor volume to the filling resin volume is larger than 130:1, obtaining a second mother liquor of a lower resin column, and feeding the second mother liquor into a second lower column mother liquor collecting tank;
and after the resin is decolorized, regenerating the used resin, wherein the regenerant is a mixed aqueous solution of 10 mass percent of NaCl and 0.2 mass percent of NaOH, and recycling the regenerated resin.
The light transmittance of the resin column-below stock solution obtained in this example was 96%, and the light transmittance of the resin column-below mother solution was 78.4%; the light transmittance of the second resin column mother liquor is 50.2%; the yield of the obtained sodium glutamate was 99.5%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for decoloring sodium glutamate feed liquid is characterized by comprising the following steps:
carrying out resin decolorization on the sodium glutamate feed liquid by adopting a continuous ion exchange method to obtain a resin lower column feed liquid;
the sodium glutamate feed liquid comprises a sodium glutamate stock solution, a first mother solution of sodium glutamate and a second mother solution of sodium glutamate; the sodium glutamate stock solution, the sodium glutamate first mother solution and the sodium glutamate second mother solution are divided into three materials and are simultaneously subjected to resin decoloration in parallel;
the resin used for resin decoloration is a Dow ion exchange resin.
2. The method according to claim 1, wherein the sodium glutamate stock solution is a filtrate obtained by sequentially decoloring sodium glutamate fermentation liquor by using powdered activated carbon and filtering by using a plate frame; the first mother liquor of sodium glutamate is mother liquor obtained by sequentially decoloring sodium glutamate stock solution by using powdered activated carbon and granular carbon and then carrying out first crystallization; and the second mother liquor of sodium glutamate is obtained by carrying out second crystallization on the first mother liquor of sodium glutamate after sequentially carrying out powdered activated carbon decolorization and granular carbon decolorization.
3. The method of claim 1, wherein the dow ion exchange resin is a trimethylamine type macroporous anion exchange resin.
4. The method according to claim 1, wherein the resin is loaded in an amount of 75-85% during the decoloring.
5. The method according to claim 1, 3 or 4, wherein the temperature for decolorizing the resin is 35-45 ℃.
6. The method according to claim 1, wherein the resin decolorization is performed in a ratio of (30-400): 1.
7. The process of claim 1 wherein the continuous ion exchange system used in the continuous ion exchange process comprises six functional resin column zones including an adsorption zone, a wash zone, a backwash zone, a secondary regeneration zone, a regeneration zone, and a regenerative rinse zone.
8. The method according to claim 1, further comprising, prior to said resin decolorizing, subjecting said sodium glutamate liquor to microfiltration; the precision of the precision filtration is 1-20 mu m.
9. A device for decoloring sodium glutamate feed liquid is characterized by comprising a stock solution feeding buffer tank, a first mother solution feeding buffer tank, a second mother solution feeding buffer tank, a stock solution conveying pump, a first mother solution conveying pump, a second mother solution conveying pump, a stock solution resin column, a first mother solution resin column, a second mother solution resin column, a lower column stock solution collecting tank, a first lower column mother solution collecting tank and a second lower column mother solution collecting tank; the stock solution feeding buffer tank, the stock solution delivery pump, the stock solution resin column and the lower column stock solution collecting tank are sequentially connected; the first mother liquor feeding buffer tank, the first mother liquor delivery pump, the first mother liquor resin column and the first lower column mother liquor collecting tank are sequentially connected; and the second mother liquor feeding buffer tank, the second mother liquor delivery pump, the second mother liquor resin column and the second lower column mother liquor collecting tank are sequentially connected.
10. The method for decoloring by using the sodium glutamate feed liquid decoloring device according to claim 9, comprising the following steps of:
collecting a sodium glutamate stock solution in a stock solution feeding buffer tank, conveying the stock solution into a stock solution resin column through a stock solution conveying pump, performing first resin decoloration, and collecting the obtained lower column stock solution of the resin in a lower column stock solution collecting tank; meanwhile, collecting the first mother liquor of sodium glutamate into a first mother liquor feeding buffer tank, conveying the first mother liquor into a first mother liquor resin column through a first mother liquor conveying pump, decoloring the second resin, and collecting the mother liquor of the obtained lower resin column into a first lower column mother liquor collecting tank; meanwhile, collecting the second mother liquor of sodium glutamate into a second mother liquor feeding buffer tank, conveying the second mother liquor into a second mother liquor resin column through a second mother liquor conveying pump, decoloring a third resin, and collecting the obtained resin lower column mother liquor into a second lower column mother liquor collecting tank.
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