- 1 、Production and design process of monosodium glutamate
- 2 、What is the design process of monosodium glutamate production?
- 3 、What does a monosodium glutamate producer do?
- 4 、What is the technological process of monosodium glutamate production design?
Production and design process of monosodium glutamate
The production of monosodium glutamate is generally divided into several main processes, such as saccharification, fermentation, extraction of glutamate crystal, purification of sodium glutamate crystal and so on.
The main ingredient of monosodium glutamate is monosodium glutamate C5H8NO4NaCl-2-aminoglutaric acid. Glutamate is one of the amino acids of oxidative metabolism in brain tissue, and monosodium glutamate also contains a small amount of sodium chloride.
Users need to pay attention to the degree of saltiness when cooking. If too salty, monosodium glutamate may not be able to eat fresh taste, the ratio of salt to monosodium glutamate at 3:1 or 4:1, can achieve a round and soft taste, when making cold dishes should be dissolved before adding. Because the dissolution temperature of monosodium glutamate is 85 ℃, below this temperature, monosodium glutamate is difficult to decompose.
Monosodium glutamate is harmful to long-term consumption:
1. After eating too much monosodium glutamate, the content of glutamate in human blood will increase, which will hinder the absorption of calcium and magnesium, resulting in short-term headache, heartbeat, nausea and other symptoms, as well as adverse effects on the reproductive system.
2, monosodium glutamate eating too much, will make people dependent on monosodium glutamate, and then eat dishes without monosodium glutamate will feel tasteless, but also hinder the absorption of other nutrients.
3. Eating monosodium glutamate may increase blood pressure. Monosodium glutamate contains about 13% sodium ion, and the body’s absorption of too much sodium ion can lead to hypertension.
4, often eat monosodium glutamate, may lead to the phenomenon of obesity, and monosodium glutamate refreshing effect, delicious food can often increase people’s appetite, in the long run, eat more weight may naturally exceed the standard.
Source: people’s Daily-what are the dangers of eating monosodium glutamate regularly? All six kinds of harm are here.
Source: Baidu encyclopedia monosodium glutamate
What is the design process of monosodium glutamate production?
The production of monosodium glutamate is generally divided into four main processes: sugar production, glutamic acid fermentation, neutralization extraction and purification.
First, the production of monosodium glutamate generally adopts the double enzyme process of liquefaction of medium temperature amylase or high temperature amylase and saccharification of liquid Glucoamylase with high conversion rate. The conversion rate of starch-enzyme and the quality of sugar solution in the enzymatic sugar production process, especially the new two-enzyme sugar production process with high temperature resistant amylase liquefaction, are higher than those of the previous acid process or acid enzyme process.
Second, starch is liquefied by amylase to form dextrin, and then Glucoamylase converts dextrin into glucose. The product obtained from enzymatic sugar can be called enzymatic sugar solution, which is different from the hydrolyzed sugar solution such as acid method. The hydrolysis tank made of stainless steel has high mechanical strength, acid and alkali resistance, long service time, but high cost. The enamel hydrolysis tank (enamel lining) has the advantages of good corrosion resistance, strong hydrochloric acid resistance and 150℃ high temperature resistance, but the disadvantage is brittleness, it is easy to break if impacted and cannot be welded on the enamel equipment.
Third: the advantage of the pressurized saccharification tank lined with acid-resistant brick and acid-resistant rubber is to withstand greater pressure, heat resistance, acid resistance and mechanical strength, the general factory can start construction, but for a long time, the ceramic tile is detached and must be checked and maintained frequently. The aseptic concentrated sugar is fed into fermentation and the sterilized sugar solution is arranged into the form of monosodium glutamate.
What does a monosodium glutamate producer do?
The main tasks he is engaged in include:
The main results are as follows: (1) using microtechnology to prepare bacteria
(2) use grinding machines, batching cans and other equipment for impurity removal, soaking, grinding and batching.
(3) operate steam jet liquefaction tower, laminar flow tank, filter press and other equipment to carry out material liquefaction, sterilization and filtration.
(4) operate saccharification tank and filter press to produce mash needed for fermentation.
(5) controlling the fermentor to convert glucose to glutamic acid.
(6) operate centrifuge to remove bacteria from fermentation broth.
(7) operate the multi-effect evaporator to concentrate the fermentation broth
(8) to prepare glutamic acid crystal solution by operating acid regulating tank and so on.
(9) operate ion exchange column centrifuge to extract and separate glutamic acid from crystal solution of supernatant.
(10) operate crystal transfer tank, centrifuge, neutralization bucket and filter press, make neutralization solution with glutamic acid, decolorize, remove iron and filter.
(11) operate the concentrated crystallization tank to make the decolorizing solution into the crystal solution.
(12) operate the centrifuge to separate the crystal liquid from solid liquid.
(13) operate vulcanized bed, dryer and multi-layer sieve to dry and screen monosodium glutamate.
(14) operate automatic packaging machine or balance, sealing machine and baling machine to pack and pack monosodium glutamate
(15) Disinfection and sterilization of production equipment
(16) fill in the production records and reports.
The following types of work are classified as this occupation:
Microbial culture workers, grinders, sugar chemicals, fermentation workers, extractors, disinfection and sterilizers, product Packers, product laboratory analysis workers
What is the technological process of monosodium glutamate production design?
1 brief introduction of the production process of monosodium glutamate
The production of monosodium glutamate is generally divided into sugar production, glutamic acid fermentation, neutralization extraction and purification.
Wait for 4 main processes.
1.1 Liquefaction and saccharification
Because of the rising price of rice, most monosodium glutamate factories use starch as raw material.
Material. Starch has to go through the liquefaction stage first. And then interact with B-amylase and enter the sugar.
Chemical stage. First, an amylase is used to liquefy the starch pulp to reduce the starch viscosity and
When it is hydrolyzed into dextrin and oligosaccharides, the content of protein in starch is lower than that of the original.
So the liquefied mixture can be directly added to Glucoamylase to enter the saccharification stage.
Instead of having to be filtered by a basket press filter after liquefaction, as with rice as the raw material.
To precipitate a large amount of protein. Calcium chloride is added in addition to amylase in the process of liquefaction.
The whole liquefaction time is about 30min. Dextrin and oligosaccharides after liquefaction at a certain temperature
The saccharification tank is further hydrolyzed to glucose. After the starch paste is liquefied, it is lowered through the cooler.
Enter the saccharification tank at 60 ℃ and add Glucoamylase to saccharify. The saccharification temperature is controlled at
About 60 ℃, PH 4.5, saccharification time 18-32 h. After the saccharification is over, the saccharification
The pot was heated to 8085 ℃ and enzyme 30min was killed. The glucose solution is filtered and filtered under pressure.
After the machine, the oil and water are separated (primary cooling separation, secondary cooling separation), and then filtered and continuously eliminated.
The poison goes into the fermentor.
1.2 glutamic acid fermentation
The disinfected glutamic acid culture liquid in the process of glutamic acid fermentation goes into the glutamic acid fermentor under flow monitoring, and the temperature is cooled to 32 ℃ through a cooling snake tube in the tank.
Bacteria, potassium chloride, manganese sulfate, defoamer and vitamins, etc., were introduced into the disinfection air.
After a period of adaptation, the fermentation process began to proceed slowly. Glutamic acid fermentation is a
In the complex microbial growth process, glutamate bacteria ingest nutrients from raw materials and pass through the body.
Specific enzymes carry out complex biochemical reactions. The reactants in the culture medium pass through the cells.
The wall and cell membrane enter the cell and convert the reactants into glutamic acid products. The whole
The fermentation process generally goes through three periods, namely, adaptation period, logarithmic growth period and decline.
Period. The concentration, temperature, PH value and air supply of the culture medium are different in each period.
Demand. Therefore, in the process of fermentation, it is necessary to provide suitable for the growth and metabolism of bacteria.
Growing environment. After about 34 hours of culture, when acid production, residual sugar, optical density, etc.
The can can be put when the standard meets certain requirements.
1.3 extraction of glutamic acid and production technology of sodium glutamate
The process is carried out in the extraction tank. Using the amphoteric properties of amino acids, glutamic acid
At the isoelectric point of pH3.0, the solubility of glutamic acid is the lowest at this pH.
Glutamic acid was obtained by precipitation for a long time. The crude lawsuit glutamic acid is separated after drying.
Keep it in a bag.
1.4 purification of sodium glutamate
Sodium glutamate solution was decolorized by activated carbon and removed by ion exchange column.
High purity sodium glutamate solution can be obtained by Mg and F e ions. Will be pure
The sodium glutamate solution was introduced into the crystallization tank for vacuum evaporation, when the Baume degree reached 295.
When the crystal seed is put into the crystal growth stage, according to the saturation and junction of the solution in the crystallization tank
The crystal condition controls the input amount and water intake of sodium glutamate solution in real time. After more than ten hours
Evaporation crystallization, when the crystal shape meets certain requirements and the material accumulates to 80% height
When the feed liquid is put into the auxiliary crystal tank, the crystal is grown and the monosodium glutamate is separated and sent to drying and sieving.
2 process comparison
2.1 Liquefaction and saccharification
Compared with rice, the protein content in starch is lower, so the liquefaction is completed.
The post-mixed liquid goes directly into the saccharification stage without going through the basket filter press. Saccharification unit
In the middle, the saccharification tank is made up of the original batch tank after modification, so that the mixed liquid can pass through
The time to connect the cans is exactly 48 hours. For example, liquefaction and saccharification with automatic equipment
The main control loops for process control are temperature and pH control of mixing tank.
Secondary injection temperature control, saccharification temperature control. The fixed volume of the mixing tank can use flow rate or liquid.
The temperature of the mixing tank is controlled by the amount of steam entering the coil at 30 ℃. The pH value is controlled at 6.4 with soda solution. These systems are controlled by single loop PID, only
If the parameters of the controller are adjusted properly, it can meet the control requirements. Starch paste is sprayed at one time
In the process of injection liquefaction, the outlet temperature control system of jet liquefier should be set up and strictly controlled.
The liquefaction temperature of the material at the outlet of the steam ejector limits its maximum dynamic deviation to the industry.
Within the range allowed by the art (usually the set value is ±0.2 ℃). Another weight in the sugar-making process
If the control system is the temperature control of the saccharification tank, it should be kept stable during the whole saccharification time.
Set the temperature to facilitate the conversion of liquefied starch to glucose. The author believes that because of liquefaction
And saccharification belongs to the raw material treatment stage, so hygiene and automation requirements can be relatively low.
Some. Coupled with the recession of the monosodium glutamate industry in recent years, small-scale manufacturers can reduce
Requirements for automation in the stage of raw material pretreatment.
2.2 treatment of bacteria and aseptic air
As we all know, the quality of bacteria directly affects the fermentation products in biochemical industry.
The quality and output of. The manufacturer has special equipment for culture and preservation of bacteria in microorganisms.
In school, natural breeding is used to prevent the degradation of bacteria. Before the production, the technicians went through
After selection, the fermentation bacteria were removed from the preserved bacteria and cultured in a shaking flask, then put into human species.
The sub-tank is used to expand the production, and finally the bacteria are added to the fermentor for fermentation. Pure air
The chemical tank is filled with multi-layer fillers to remove all kinds of microorganisms in the air.
Substances, including bacteria and bacteriophages. The air purification tank is also one of the pre-fermentation processes.
In an important part, the growth of glutamate bacteria must be carried out in an aerobic environment.
The ventilation rate is changed during the same growth period, in which during the logarithmic growth period, due to the survival of the bacteria.
In the fermentation broth, the dissolved oxygen (D0 value) in the fermentation broth is very important to the bacteria. If
The purification tank fails, resulting in the presence of miscellaneous bacteria and harmful bacteriophages in the air entering the fermentor.
This will cause the fermentation process to be contaminated, thus affecting the fermentation process. So do it well.
The regular maintenance of the purification tank is very important. The former is due to work.
The intensity is small and does not require the intervention of machine automation, while the latter is not needed because the equipment is simple.
Be automated. What they both have in common is to prevent microbial contamination.
2.3 Control of glutamic acid fermentation process
Glutamic acid fermentation is a complex biochemical process, which requires rapid growth of bacteria.
High speed, normal metabolism and more products must provide a good growth environment for it. General
The main control parameters are ventilation or dissolved oxygen, pH value of fermentation broth, fermentation temperature and tank.
Wait. Because the cell growth and the synthesis of secondary metabolites in the fermentation process are very
Complex, coupled with the large scale of fermentation, sensitive to various influencing factors, so fermentation
The process is more suitable for the use of automation to control production. In the production process
The control of dissolved oxygen (fi) punches air through a small hole in the air distributor
The bottom of the fermentor bubbles up, and then after full stirring, it diffuses to the liquid phase.
Play an important role. Therefore, biological oxygen supply can not simply stay in the fermentation stage.
To adjust the set value of ventilation, dissolved oxygen on-line analyzer and exhaust can be used.
CO: and 0 concentration analyzer constitute a multivariable advanced control system, computer
Ventilation control is adjusted according to the actual oxygen content in fermentation broth and the growth and metabolism of bacteria.
The setting value of the system and the speed of the stirring motor play an important role in improving the concentration of dissolved oxygen.
It works well. The control of pH value control adopts nonlinearity with many kinds of constraints.
PID control method, in order to obtain excellent control effect. Temperature control according to fermentation
The time and process of the line require the design of an optimal fermentation temperature setting function. And then through.
The computer automatically controls the temperature change according to this function. Tank pressure control is usually controlled in
O.O5~O.1 M Pa to prevent the entry of dirty air from the outside to cause bacteria infection and tank pressure.
High will increase resistance and energy consumption. The tank pressure can be controlled by single loop PID. In addition, since
The control program of dynamic feeding and defoaming calculates the initial suitability of reducing the concentration of sugar solution by monitoring the process.
It’s time to replenish sugar. It is usually used to homogenize a certain amount of sugar solution within a certain period of time.
Batch control method for uniform flow into the tank. Defoaming can be controlled by position control with buffer.
2.4 extraction process
During the extraction process, the glutamic acid in the fermentation broth should be obtained as much as possible according to the isoelectric condition.
The principle of point separation can be used to design temperature program setting control and pH program setting control.
In the process of isoelectric point neutralization control, pH control precision is required to be high and difficult.
This is due to the high sensitivity of the system at the beginning of the neutralization process.
The amount of acid is difficult to control properly, and the pH value is easy to overshoot, which leads to neutralization in the early stage.
The large fluctuation of pH value. In the middle and later stage, with the decrease of pH value, the system reverses.
The sensitivity should be weakened, and if the controller is still adjusted according to the original law and intensity, it can reach medium.
The time of and the end point will be prolonged, so it is necessary to introduce the self-adjustment of controller parameters.
Integral or nonlinear control strategy. In the process of neutralization, the temperature and pH must be pressed at the same time.
The set reference trajectory changes synchronously, and the rate of change of temperature and pH is also strict.
There is a certain correlation between pH and temperature control loops. In the second time
During the neutralization process, the pH value should be adjusted from 3.2 to 5.6, as the neutralization point approaches.
The static amplification factor of the system increases gradually, which leads to the decrease of the stability of the system. Therefore, the second time
The neutralization process and isoelectric point neutralization have opposite control characteristics, and this process must be set up.
Two different neutralization control systems are designed to meet the needs of production.
2.5 Refining process control
The crystallization process of monosodium glutamate goes through the formation of supersaturated solution, nucleation and crystallization.
There are three stages. The growth of crystals usually requires the input of a certain crystal nucleus, so that you can
The crystal growth rate is accelerated. At this time, the supersaturation in the crystallization tank must be strictly controlled.
Degree, so that after increasing the crystal seed, it does not produce a new crystal nucleus, nor dissolve the crystal seed, so that it can crystallize.
The operation works in the metastable region, which is beneficial to the stable growth of the crystal nucleus. Principles of crystallization operation
It is to strive for the maximum crystallization rate and yield, and to obtain a uniform and tidy crystal form. For
In order to meet the above requirements, the vacuum degree can be controlled automatically and the feed concentration f can be oversaturated.
And degree), temperature control and liquid level control of the crystallization tank.
With the continuous development of computer and automation technology, modern automation technology
It is more and more widely used in industrial production. With the addition of automation, industrial production is effective.
Greatly improve the production environment and reduce the work intensity of personnel at the same time. When
However, for the situation that our country is in development and the scale of some domestic monosodium glutamate enterprises is small
In terms of large-scale automation, both in terms of funds and personnel in the short term
It is difficult, so the author believes that it is necessary to implement self-implementation at the main stage of the production process.
Dynamic control is still feasible.
So much for the introduction of monosodium glutamate automatic packing machine. Thank you for taking the time to read this site. Don’t forget to look for more information about monosodium glutamate filling machine and monosodium glutamate automatic packing machine.