Method for treating last monosodium glutamate mother liquor

Abstract

The invention discloses a method for treating a last monosodium glutamate mother liquor, which comprises the steps: removing sulfate radicals in the last monosodium glutamate mother liquor containing sodium pyroglutamate impurities through barium salt first, then using ionic membrane caustic soda to hydrolyze to ensure that sodium pyroglutamate is unlinked and transformed into sodium glutamate, precipitating a large amount of flocculent colloid at the same time, then removing precipitated colloid protein, salt precipitations and the like through two plate-and-frame filtrations, sending filtrate into an inorganic membrane for microfiltration separation to further remove impurities such as solid protein to obtain clear permeate liquid, sending the permeate liquid into a nanofilration membrane separation system to remove impurities such as soluble colloid, protein, residual sugar and pigment to obtain high-quality feed liquid, and re-sending the feed liquid into a monosodium glutamate production cycle chain to produce monosodium glutamate. The method removes impurities such as sulfate, metallic ions (such as calcium, magnesium, iron and the like), colloid, protein, residual sugar and pigment in the last monosodium glutamate mother liquor, improves the quality of the hydrolysis of the last monosodium glutamate mother liquor, replaces acid hydrolysis, reduces the consumption of a decoloring agent and the discharge amount of wastewater, and ensures that the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of monosodium glutamate production, and relates to a method for processing the last mother liquor of monosodium glutamate. Background technique [0002] Monosodium glutamate, also known as monosodium glutamate, is a monosodium salt of L-glutamic acid with a molecule of crystal water. The most used seasoning. Monosodium glutamate can be completely ionized into glutamic acid ions and sodium ions in aqueous solution, and its aqueous solution increases with pH, ​​and when heated at high temperature for a long time, sodium glutamate is destroyed, and a molecule of water is removed from the molecule to form Sodium pyroglutamate loses its umami taste. In addition, sodium pyroglutamate does not have optical activity, and its production has a major adverse effect on the yield of refining and the quality of finished products. However, sodium pyroglutamate can be hydrolyzed by acid and alkali to open the ring into so...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problems of high energy consumption and incomplete removal of impurities in the existing technology for the treatment of the last monosodium glutamate mother liquor, and to provide a method for efficiently treating the last monosodium glutamate mother liquor