High-purity glutamic acid and preparation method thereof
A glutamic acid and high-purity technology, which is applied in the field of high-purity glutamic acid and its preparation, can solve the problems of low product yield, high glutamic acid impurities, environmental pollution and other problems in the purification method, so as to reduce the difficulty of environmental protection treatment and product The effect of high yield
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Embodiment 1
[0028] High-purity glutamic acid with a glutamic acid content of not less than 99% is prepared from glutamic acid fermentation broth.
[0029] Proceed as follows:
[0030] 1) Concentrate glutamic acid fermentation liquid: turn on the vacuum pump of the five-effect falling film evaporator, and after the vacuum degree of the fifth-effect separator reaches -0.07MPa, pump in fresh fermentation liquid and turn on the circulating pump to concentrate the glutamic acid fermentation liquid to The concentration is 32mg / 100ml;
[0031] 2) Continuous isoelectric extraction of glutamic acid: pump the glutamic acid concentrate prepared in step 1) and the glutamic acid mother liquor obtained in step 5) of sulfuric acid hydrolysis into the continuous isoelectric tank containing the base material, and control the isoelectric The acidity of the tank is pH3.22, and the bottom material here is a glutamic acid solution containing a large amount of small glutamic acid crystals. After the crystal g...
Embodiment 2
[0042] Using common glutamic acid as raw material to prepare high-purity glutamic acid, the steps are as follows:
[0043] 1) Dissolution and crystallization: Dissolve the β-type glutamic acid crystal washing water separated by the belt separator in step 2) of common glutamic acid to a mass concentration of about 40%, and pump it into the glutamic acid crystallization tank from the bottom to control the glutamic acid Acid crystallization temperature is 75°C, and crystallization time is 3 hours;
[0044]2) Cooling and separation: the glutamic acid metamorphic liquid overflowed from the metamorphic tank is introduced into the cooling tank in two-stage series, the temperature is lowered to 20°C, and pumped into the belt separator to separate glutamic acid with a content of about 97%. β-type crystalline glutamic acid, the glutamic acid mother liquor separated from the front section of the belt separator is hydrolyzed with sulfuric acid as an isoelectric acid solution, and the glut...
Embodiment 3
[0052] The preparation of high-purity glutamic acid from metamorphic glutamic acid or its solution is as follows:
[0053] 1) Neutralization: adding metamorphic glutamic acid or its solution into a NaOH solution with a mass concentration of 30% for complete neutralization to prepare a sodium glutamate solution with a pH of 6.99 and a mass concentration of 45%;
[0054] 2) Decolorization and iron removal: the sodium glutamate solution prepared in step 1 is sequentially passed through activated carbon-iron removal resin column-activated carbon column to remove impurities and pigments in the sodium glutamate solution;
[0055] 3) Acidification: Add hydrochloric acid to the refined sodium glutamate solution prepared in step 2), adjust the acidity to pH 4.5, and the temperature is 25°C. After the crystals are formed, grow the crystals for 2 hours, adjust the acidity to pH 3.0, and the temperature is 17°C , to prevent crystal precipitation.
[0056] 4) Cooling: Stir the glutamic ac...
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