Process for preparing glutamic acid crystallization

Abstract

Disclosed is a process for producing the crystal of glutamic acid, which includes filtering the fermented liquid of glutamic acid by ceramic membrane to remove the thallus in the fermented liquid of glutamic acid, then making the obtained clearing fermented liquid of glutamic acid gradient temperature lowering crystallization using batch continuous isoelectric method in the crystallizing tank, and sulfuric acid is added in the crystallizing tank by calandria porous showering method to reduce pH value, wherein the feed liquid is discharged continuously into the lower-stage tank using the mode of overflow on the top of tank, and in the lower-stage tank 2 / 3 of feed liquid is from the upper-stage tank by overflow and 1 / 3 of feed liquid is concentrated liquid. The crystal of glutamic acid obtained by the method is the alpha mode.

Description

technical field [0001] The invention relates to a method for producing glutamic acid crystals. Specifically, the invention relates to a method for preparing glutamic acid crystals by isoelectric point crystallization when glutamic acid is produced by fermentation. Background technique [0002] Glutamic acid is mainly used in the production of monosodium glutamate. The most widely used method for the production of glutamic acid at home and abroad is the fermentation method. There are many techniques for extracting glutamic acid from the fermentation broth. The main methods are: isoelectric extraction of glutamic acid Amino acid, ion exchange method to extract glutamic acid, zinc salt method to extract glutamic acid, hydrochloride method to extract glutamic acid or electrodialysis method to extract glutamic acid, etc. [0003] Among them, the extraction of glutamic acid by the isoelectric method utilizes the following properties of glutamic acid: at the pH of the isoelectric p...

AI Technical Summary

Problems solved by technology

The specific extraction methods can be divided into intermittent isoelectric method and continuous isoelectric method. The advantage of intermittent isoelectric method is that the process is mature and the crystal particles are relatively uniform. The disadvantage is that it cannot be operated continuously and the efficiency is low; , each level of crystallization tank is set with a fixed isoelectric pH value, which is easy to control, but the disadvantage is that the particles are not uniform; in the link of reducing the pH value of the crystallization tank and adding sulfuric acid, the traditional process uses directly connecting the sulfuric acid pipeline to the crystallization tank. When sulfuric acid is added, partial supersaturation is prone to occur and β-type crystals are produced. β-type crystals are not easy to be centrifuged and dehydrated, and the bulk density is small, which brings certain difficulties to later packaging and transportation. Type formation

For example, the patent application CN88103158 of Tianjin Light Industry Design Institute, etc., the patent ZL96116404.2 of Wuxi Light Industry University and the patent ZL02109965.0 of Liu Shizhai all adopt continuous isoelectric crystallization to extract glutamic acid, but still fail to overcome the above defects

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