阅读说明：本技术 一种采用大孔强碱阴树脂精制味精的方法 (Method for refining monosodium glutamate by adopting macroporous strong base anion resin ) 是由 李学朋 徐淑伟 伏广好 杜鹏 徐亚娟 高启超 刘超 于 2018-05-31 设计创作，主要内容包括：本发明属于味精制备技术领域,公开了一种大孔强碱阴树脂精制味精的方法,其包括：谷氨酸晶体加水加纯碱中和、中和液加粉炭脱色、板框过滤、大孔强碱阴树脂脱色以及蒸发浓缩结晶干燥。本发明方法既能提高味精质量、保证成品味精雪白透亮,还能减少酸碱和水的消耗量。(The invention belongs to the technical field of monosodium glutamate preparation, and discloses a method for refining monosodium glutamate by macroporous strong base anion resin, which comprises the following steps: adding water into glutamic acid crystals, adding soda ash into the glutamic acid crystals for neutralization, adding powdered carbon into the neutralized solution for decolorization, filtering the neutralized solution by using a plate frame, decolorizing the neutralized solution by using macroporous strong base anion resin, evaporating, concentrating, crystallizing and drying. The method of the invention can improve the quality of the monosodium glutamate, ensure that the finished monosodium glutamate is snow white and transparent, and reduce the consumption of acid, alkali and water.)

1. a method for refining monosodium glutamate by macroporous strong base anion resin comprises the following steps: adding water into glutamic acid crystals, adding soda ash into the glutamic acid crystals for neutralization, adding powdered carbon into the neutralized solution for decolorization, filtering the neutralized solution by using a plate frame, decolorizing the neutralized solution by using macroporous strong base anion resin, evaporating, concentrating, crystallizing and drying.

2. Method according to claim 1, characterized in that it comprises the following steps:

Step 1), adding water and soda ash into glutamic acid crystals for neutralization, adjusting the baume degree to 26-27, controlling the temperature to 60-65 ℃, and completely dissolving the glutamic acid crystals;

Step 2) adding activated carbon into the neutralized liquid generated in the step 1) for decoloring, keeping the temperature at 60-65 ℃, and decoloring for 30-40 minutes;

step 3) filtering the feed liquid decolorized for 30-40 minutes in the step 2) by a plate frame, intercepting active carbon in the plate frame, and transmitting the collected plate frame filtrate by 86-88%;

Step 4) feeding the plate-and-frame filtrate which is subjected to 86-88% of light transmission in the step 3) into a resin column for decolorization, wherein the flow rate of the fed liquid is 2BV/h, the feeding temperature is kept at 60-65 ℃, and the light transmission of a neutralization solution is more than 97% after the neutralization is carried out by the resin decolorization;

Step 5) concentrating and crystallizing the neutralization solution with the light transmittance of more than 97 percent in the step 4) by using a crystallizing tank;

Step 6) performing solid-liquid separation on the feed liquid obtained in the step 5) by using a flat centrifuge, drying the separated and collected crystals by using a vibrating fluidized bed dryer, and controlling the air temperature entering a fluidized bed to be 70-80 ℃;

And 7) packaging the finished monosodium glutamate dried in the step 6).

3. The method according to claim 2, wherein the amount of the activated carbon is 5kg per 1000L of the neutralized solution.

4. The method of claim 2, wherein the resin is a macroporous strong base styrenic anion resin.

5. The method as claimed in claim 2, wherein the temperature in the crystallization tank is controlled to 65-75 ℃ and the vacuum degree is controlled to be between-0.07 and-0.085.

Technical Field

the invention belongs to the technical field of monosodium glutamate preparation, relates to a production method of refined monosodium glutamate, and particularly relates to a method for refining monosodium glutamate by adopting macroporous strong base anion resin.

background

monosodium glutamate, known as sodium glutamate, and chemical name of monosodium alpha-aminoglutarate, is a salt formed by sodium ions and glutamate ions, wherein glutamic acid is an amino acid, and sodium is a metal element. The main ingredient of monosodium glutamate which is a seasoning commonly used in life is sodium glutamate. The monosodium glutamate is a common flavoring agent in daily life, can increase the delicate flavor of food, and is beneficial to improving the digestibility of human bodies to the food. In addition, sodium glutamate has very important functions and is widely applied to the fields of food, medicine, industry, agriculture and the like.

At present, the main production process of the monosodium glutamate in China comprises the following steps: adding water into glutamic acid crystals after fermentation and extraction, adding soda ash for neutralization and dissolution, adjusting the pH of a dissolved monosodium glutamate neutralization solution to 6.1-6.3, adjusting the Baume degree to 26-27, adding 5 per mill of activated carbon (powdered carbon) for decolorization, controlling the decolorization temperature to 60-65 ℃, controlling the decolorization time to 30-40 minutes, filtering and intercepting the powdered carbon by a plate frame, feeding plate frame filtrate into a carbon column (granular carbon) for decolorization, feeding the carbon column at the flow rate of 1BV/h, concentrating, crystallizing and drying the feed liquid subjected to the decolorization by the carbon column to obtain the finished monosodium glutamate.

The current process has the main problems that:

1. The carbon column (granular carbon) has limited decolorizing capability, and the monosodium glutamate neutralization solution is removed by powder carbon

The light transmittance after coloring is generally 86-87%, and the light transmittance after decoloring by using the granular carbon is 88-90%, the light transmittance of the granular carbon is improved by 2-3%, the improvement amplitude is small, the color of the finished monosodium glutamate is yellow and dark, the sense is poor, and the product phase is seriously influenced.

2. The feeding flow of the carbon column is controlled to be 1BV/h, the feeding flow is low, and a large amount of particles are required to be configured

The consumption of acid, alkali and water used for regenerating the corresponding granular carbon is also relatively large in the granular carbon column.

3. The granular carbon can also adsorb a certain amount of monosodium glutamate, so that monosodium glutamate loss is caused.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for refining monosodium glutamate by adopting macroporous strong base anion resin, which can improve the quality of monosodium glutamate, ensure that the finished monosodium glutamate is snow white and transparent, and reduce the consumption of acid, alkali and water.

The invention is realized by the following technical scheme:

A method for refining monosodium glutamate by macroporous strong base anion resin comprises the following steps: adding water into glutamic acid crystals, adding soda ash into the glutamic acid crystals for neutralization, adding powdered carbon into the neutralized solution for decolorization, filtering the neutralized solution by using a plate frame, decolorizing the neutralized solution by using macroporous strong base anion resin, evaporating, concentrating, crystallizing and drying.

further, the method comprises the steps of:

step 1), adding water and soda ash into glutamic acid crystals for neutralization, adjusting the baume degree to 26-27, controlling the temperature to 60-65 ℃, and completely dissolving the glutamic acid crystals;

Step 2) adding activated carbon into the neutralized liquid generated in the step 1) for decoloring, keeping the temperature at 60-65 ℃, and decoloring for 30-40 minutes;

Step 3) filtering the feed liquid decolorized for 30-40 minutes in the step 2) by a plate frame, intercepting active carbon in the plate frame, and transmitting the collected plate frame filtrate by 86-88%;

Step 4) feeding the plate-and-frame filtrate which is subjected to 86-88% of light transmission in the step 3) into a resin column for decolorization, wherein the flow rate of the fed liquid is 2BV/h, the feeding temperature is kept at 60-65 ℃, and the light transmission of a neutralization solution is more than 97% after the neutralization is carried out by the resin decolorization;

Step 5) concentrating and crystallizing the neutralization solution with the light transmittance of more than 97 percent in the step 4) by using a crystallizing tank;

Step 6) performing solid-liquid separation on the feed liquid obtained in the step 5) by using a flat centrifuge, drying the separated and collected crystals by using a vibrating fluidized bed dryer, and controlling the air temperature entering a fluidized bed to be 70-80 ℃;

And 7) packaging the finished monosodium glutamate dried in the step 6).

preferably, the first and second electrodes are formed of a metal,

The amount of the activated carbon added was 5kg per 1000L of the neutralization solution.

preferably, the first and second electrodes are formed of a metal,

The resin is macroporous strong base styrene series anion resin.

Preferably, the first and second electrodes are formed of a metal,

The temperature in the crystallizing tank is controlled to be 65-75 ℃, and the vacuum degree is controlled to be-0.07 to-0.085.

compared with the prior art, the technology of the invention adopting the process has the advantages that:

1. the decolorizing capacity or the decolorizing depth of the resin is obviously higher than that of granular activated carbon, the light transmittance of the feed liquid can be improved by 2-3% after the decoloration of the granular activated carbon, the light transmittance of the feed liquid can be improved by 10% after the decoloration of the resin, the light transmittance of the feed liquid is more than 97% after the decoloration of the resin, and the prepared finished product of the monosodium glutamate has high quality, snow white and transparent monosodium glutamate and good appearance.

2. The granular activated carbon can adsorb a certain amount of monosodium glutamate, the resin can not adsorb monosodium glutamate, and monosodium glutamate loss can not be caused by decoloration of the resin.

3. the decolouring feeding flow rate of the resin is 2BV/h, the decolouring feeding flow rate of the granular activated carbon is 1BV/h, the using amount of the resin is half of that of the granular activated carbon, and the regeneration consumption is reduced by 50 percent.

4. the method is simple and feasible, is easy to operate, can save the consumption of water and acid and alkali, saves the cost for enterprises, and has better popularization.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the present invention will be described more clearly and completely below with reference to specific embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. 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.