Method for extracting glutamic acid
Technical field the invention belongs to the technical field of glutamic acid fermentation production, relates to a method for extracting of the glutamic acid. Background art there are a lot of extracting glutamic acid at home and abroad extraction method, commonly used with isoelectric point law glutamic acid extraction method, ion exchange method, and metallic salt method, such as ion exchange membrane electrodialysis. Currently, many manufacturers are adopting isoelectric point law extracting glutamic acid, mainly using glutamic acid is the nature of the amphoteric electrolyte, the fermentation the fluid adds the acid adjusting the pH to the isoelectric point of glutamic acid pH3.22, the glutamic acid precipitate out. electricity craft in the traditional, and the like, and in such a time after the end of the sedimentation separation must be used the supernatant liquid in the storage tank is pumped into the high-solid-liquid mixture, and then flows into the conical centrifuge from the high-level tank for centrifugal purification, the separated solid to the artificial packaging and transport the process of the valve, then the packed solid glu inputs in the tank to the valve, in order to obtain high purity, quality is better glutamic acid. Traditional electricity craft of extracting glutamic acid has the following shortcomings: 1), in accordance with centrifugal separation 1 million tons glu meter: power consumption 30 million degrees, not only the equipment investment is great, and the energy consumption is high; 2), consumption of the screen 15 pay, value 2 million Yuan, packaging, transport and feeding links to the recruitment of about 6000 days, costs 36 million, packaging wrapper required for consumption in the course of 20 million strip, value of approximately 40 million, the material consumption is high; 3), in the process of the whole operation, glutamic acid loss rate is about 0.3%, loss of about 18 million dollars. The content of the invention is the purpose of this invention is to solve the problems of the prior art high energy consumption, high production cost and technical problems of high loss rate of the glutamic acid, to provide a method for extracting of the glutamic acid, in order to overcome the deficiency of the prior art. The technical scheme of the invention is in the prior art to realize improved on the basis of, in the method, the additional mixing stired the washing process, the crystallization can be glutamic acid attached to the surface of the mother liquor in the dissolved impurities effectively, thus the effect of purification and separation can be played. The detailed operation steps of the new method are as follows: 1) and temperature in such as: after electricity pot into the fermentation liquor and the like, according to the acid-producing situation exchanges Canada right amount of high flow, volume is 15-20%, or hydrolysate for pH1.5 cidizing gao Liu adjust slowly to pH 3.2, and gradually lowering the temperature to the 5-10 [...] , let in the fermented solution crystallization is carried out by full of the glutamic acid; 2) a settling separation: electric such as fermentation solution after the end of crystallization, cessation of stirring, standing 6-10 hours, the supernatant liquor is pumped into the ion-exchange procedure to be processing, clear bottom layer settling zone is pumped into the cooling tank, lowering the temperature to the 5-10 [...] , conveying to the sedimentation separator a settling separation; 3) and mixed and stired the washing: after a time separation of stirs the pot solid glu is pumped into the mixing, stirring the accent mixes metacryst mother liquor for the liquid in the tank the weight ratio of solid content of 50%, for the sodium hydroxide lye pH3.8-4.0, stirring 30-60min, stirring speed control on the 30r/min, the impurities on the surface of the attached to the glutamic acid is dissolved in the mother liquor; 4) secondary settling separation: after washing is ended stirring mixing, stirring is stopped, the 3.5-4.5 hours, the supernatant is pumped into the hydrolyzed in hydrolysis process, in the bottom of the liquid pumped into the second settling tank; 5) of the valve: the filter for washing the solid secondary sedimentation glutamic acid into the tank of the valve, for adjusting the mother liquor or monosodium glutamate containing sodium hydroxide lye pH4.6 ± 0.2, the concentration adjustment liquid the 28-30Be [...] , access steam adjusting the temperature of the 50 ± 5 [...] ; 6) metacryst: end of the valve and then through the secondary purification treatment, after cold drawing and cooling, is separated for better quality filter glutamic acid, monosodium glutamate refining process of direct access. The new process of this invention compared with the traditional process has reduced the mechanical centrifugal separation and pack the solid semi-finished product and transport links, having increased and mixed and stired the washing process, and mixed and stired the washing to fully remove impurities on the surface of the attached to the glutamic acid, plays the role of the purification. This process can achieve full automatic continuous solid-liquid mixing material conveying, thus totally give up mechanical centrifugal, avoid manual packaging, transportation and artificial material of high strength such as the human labor, loss of reducing glutaminic acid at the same time to improve the yield, saves a large amount of manpower, material resources and equipment investment. Compared with the traditional process, million tons glu productivity reduce the equipment investment 50 million, saving power consumption 30 million kwhr, can reduce the labor 5000 days, saving the packaging 20 million strip, the cost is reduced loss 0.3%, i.e. million tons every year glutamic acid production cost can be saved 106 million dollars, has relatively good social and economic benefits. Save the cost calculation: 300000 kwhr × 0.6 yuans of + 5000 × 60 days $+ 200000 strip × 2 + 10000 × 0.3% = 106 $$ At the same time, the invention can be used in the traditional process is directly carried out on the basis of the transformation, million tons of reconstruction cost of the production capacity of only several tens, short period, therefore the whole of the glutamic acid in the fermentation industry has extremely high promotion value. The Figure illustrates the attached drawing is a schematic diagram of the invention process flow. Mode of execution Embodiment 1 of the present invention the method for extracting of the glutamic acid specific operating steps are as follows: 1), and in: such as after electricity pot to the fermented solution, adjusting pH for the slow the hydrolysate to 3.2, and gradually lowering the temperature to the 5 [...] , let in the fermented solution crystallization is carried out by full of the glutamic acid; 2) a settling separation: electric such as fermentation solution after the end of crystallization, cessation of stirring, for 8 hours, the supernatant liquor is pumped into the ion-exchange procedure to be processing, clear bottom layer settling zone is pumped into the cooling tank, lowering the temperature to the 6 [...] , conveying to the sedimentation separator a settling separation; 3) and mixed and stired the washing: after a time separation of stirs the pot solid glu is pumped into the mixing, stirring the accent mixes metacryst mother liquor for the liquid in the tank the weight ratio of solid content of 50%, for the sodium hydroxide lye pH3.8, stirring 50 min, stirring speed control on the 30r/min, the impurities on the surface of the attached to the glutamic acid is dissolved in the mother liquor; 4) secondary settling separation: after washing is ended stirring mixing, stirring is stopped, static 4 hours, the supernatant is pumped into the hydrolyzed in hydrolysis process, in the bottom of the liquid pumped into the second settling tank; 5) of the valve: the filter for washing the solid secondary sedimentation glutamic acid into the tank of the valve, regulating sodium hydroxide lye pH4.6 ± 0.2 for, adjusting the concentration of the liquid the 28Be [...] , access steam adjusting the temperature of the 50 ± 5 [...] ; 6) metacryst: end of the valve and then through the secondary purification treatment, after cold drawing and cooling, separation to obtain the filter for glutamic acid, monosodium glutamate into the process. Embodiment 2 according to embodiment 1, the detailed operation steps are as follows: 1) and temperature in such as:to the fermented solution such as after electricity pot , pH1.5 for slow adjusting cidizing gao Liu to pH 3.2, and gradually lowering the temperature to the 9 [...] , let in the fermented solution crystallization is carried out by full of the glutamic acid; 2) a settling separation: electric such as fermentation solution after the end of crystallization, cessation of stirring, for 10 hours, the supernatant liquor is pumped into the ion-exchange procedure to be processing, clear bottom layer settling zone is pumped into the cooling tank, lowering the temperature to the 5 [...] , conveying to the sedimentation separator a settling separation; 3) and mixed and stired the washing: after a time separation of stirs the pot solid glu is pumped into the mixing, stirring the accent mixes metacryst mother liquor for the liquid in the tank the weight ratio of solid content of 50%, for the sodium hydroxide lye pH4.0, stirring 60 min, stirring speed control on the 30r/min, the impurities on the surface of the attached to the glutamic acid is dissolved in the mother liquor; 4) secondary settling separation: after washing is ended stirring mixing, stirring is stopped, static 4 hours, the supernatant is pumped into the hydrolyzed in hydrolysis process, in the bottom of the liquid pumped into the second settling tank; 5) of the valve: the filter for washing the solid secondary sedimentation of the valve into the tank of the glutamic acid, sodium glutamate mother liquor regulating pH4.6 ± 0.2 for, adjusting the concentration of the liquid the 28Be [...] , access steam adjusting the temperature of the 50 ± 5 [...] ; 6) metacryst: end of the valve and then through the secondary purification treatment, after cold drawing and cooling, is separated for better quality filter glutamic acid, monosodium glutamate refining process of direct access. The present invention discloses a method of extracting glutamic acid, which is realized through an improvement based on the prior art. In the method, mixing and washing procedures are added; impurities adhered to the surface of crystallized glutamic acid are effectively dissolved in mother liquor; and thus the effects of purification and separation can be realized. Compared with the traditional technology, the stages of mechanical centrifugal separation and packaging and transportation of solid semi-finished products are reduced in the present invention; and the mixing and washing processes are added to fully eliminate the impurities adhered to the surface of the glutamic acid, so as to perform purification effects. The present invention can realize the wholly automatic and continuous transportation of mixture of solid materials and liquid materials, so as to completely eliminate the mechanical centrifuge and to avoid high-intensity manual labor of packaging, transportation, material feeding and so on; simultaneously, the loss of the glutanic acid is reduced, thereby improving the efficiency and saving a large quantity of labor power, material resources and equipment investment. 1. Glutamic acid extraction method, which is characterized in that operation according to the following process steps: 1), and in: such as after electricity pot into the fermentation liquor, or hydrolysate for pH1.5 cidizing gao Liu adjust slowly to pH 3.2, and gradually lowering the temperature to the 5-10 [...] , let in the fermented solution crystallization is carried out by full of the glutamic acid; 2) a settling separation: electric such as fermentation solution after the end of crystallization, cessation of stirring, standing 6-10 hours, the supernatant liquor is pumped into the ion-exchange procedure to be processing, clear bottom layer settling zone is pumped into the cooling tank, lowering the temperature to the 5-10 [...] , conveying to the sedimentation separator a settling separation; 3) and mixed and stired the washing: after a time separation of stirs the pot solid glu is pumped into the mixing, stirring the accent mixes metacryst mother liquor for the liquid in the tank the weight ratio of solid content of 50%, for the sodium hydroxide lye pH3.8-4.0, stirring 30-60min, stirring speed control on the 30r/min, the impurities on the surface of the attached to the glutamic acid is dissolved in the mother liquor; 4) secondary settling separation: after washing is ended stirring mixing, stirring is stopped, the 3.5-4.5 hours, the supernatant is pumped into the hydrolyzed in hydrolysis process, in the bottom of the liquid pumped into the second settling tank; 5) of the valve: the filter for washing the solid secondary sedimentation glutamic acid into the tank of the valve, for adjusting the mother liquor or monosodium glutamate containing sodium hydroxide lye pH4.6 ± 0.2, the concentration adjustment liquid the 28-30Be [...] , access steam adjusting the temperature of the 50 ± 5 [...] ; 6) metacryst: end of the valve and then through the secondary purification treatment, after cold drawing and cooling, is separated for better quality filter glutamic acid, monosodium glutamate refining process of direct access.