Normal pressure crystallization method for monosodium glutamate

Abstract

The invention provides a normal pressure crystallization method for monosodium glutamate, aiming to solve the problems that a great amount of pyroglutamic acid and racemized glutamic acid can be generated because temperatures of upper and lower parts of a sodium glutamate solution are different in the current monosodium glutamate crystallization method. The invention has the keypoint that: the crystallization process is finished in normal pressure crystallization equipment, a heating and evaporating process is finished in negative pressure heating and evaporating equipment, the normal pressure crystallization equipment and the negative pressure heating and evaporating equipment are connected end to end by a pipeline, and a pressure pump and a feed inlet are arranged on the pipeline between the normal pressure crystallization equipment and the negative pressure heating and evaporating equipment. The normal pressure crystallization method for monosodium glutamate provided by the invention has the beneficial effects that: monosodium glutamate can be crystallized under a normal pressure, the crystallization temperature is kept at 55-60 DEG C all the way, the generation of the pyroglutamic acid can be reduced furthest, and racemization of glutamic acid can be avoided.

Description

technical field [0001] The invention relates to a monosodium glutamate crystallization method, specifically a monosodium glutamate atmospheric pressure crystallization method. Background technique [0002] The production of monosodium glutamate is through the neutralization of glutamic acid and sodium hydroxide (or sodium carbonate) to form a sodium glutamate solution, which is crystallized after decolorization and impurity removal, and the obtained crystal is monosodium glutamate. [0003] The crystallization of monosodium glutamate is made by concentrating the sodium glutamate solution, so that the sodium glutamate in the solution reaches supersaturation and crystallizes out. The remaining mother liquor containing sodium glutamate is decolorized to remove impurities, then recycled and recrystallized to produce monosodium glutamate. Since glutamic acid will form pyroglutamic acid and lead to glutamic acid racemization at higher temperatures, all concentration and crystalli...

AI Technical Summary

Problems solved by technology

[0005] In addition, due to the influence of the equipment structure, the internal circulation crystallization tank and the interlayer crystallization tank have a small heating area and require a large evaporation temperature difference. It is impossible to use steam heat pumps, mechanical heat pumps, multi-effect evaporation and other equipment to recover and utilize the secondary steam. , it is impossible to achieve the effect of saving steam, reducing the amount of circulating water, low carbon and energy saving

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