Method for further reclamation of L-tyrosine from effluent of L-cystine production
A technology of tyrosine and effluent, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of low product yield and low purity, achieve high yield, simple process, and less loss Effect
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Embodiment 1
[0014] For the exchange tower using granular activated carbon column as filler, the carbon column is treated to pH = 3-4 before each separation. In this example, the particle size of the carbon column is 5mm, and the model is 1200×4800. Collect the refined discharge liquid produced by protein hydrolysis to produce L-cystine, in which the content of L-tyrosine is 6.734kg / m 3 . The solution was adjusted to pH=2 with hydrochloric acid, at a flow rate of 2.5m 3 / h passes through the exchange tower, and the tower effluent is detected by the sulfuric acid formaldehyde test, and blue (carbon column saturation) occurs to stop the liquid intake, and then the 3% dilute NaOH solution is mixed with 2.0m 3 / h passes through the exchange tower, and receives the carbon column eluent 6m 3 , concentrated hydrochloric acid to neutralize the eluent to pH = 8.5, stir to crystallize, and centrifuge to obtain 126 kg of crude L-tyrosine. Pass 2.5% hydrochloric acid through the desorbed carbon co...
Embodiment 2
[0016] The same solution as Example 1, adjusted to pH=2.5 with liquid ammonia, with a flow rate of 2.0m 3 / h is passed through the exchange tower treated in Example 1, and the tower effluent is detected with sulfuric acid formaldehyde test, and blue color appears to stop the liquid intake, and then the flow rate is 2.0m 3 / h into 5% NaOH solution, collected eluate 6.5m 3 , concentrated hydrochloric acid to neutralize the eluent to pH = 7, stir to crystallize, and centrifuge to obtain 132 kg of L-tyrosine crude product. Pass 4% hydrochloric acid into the desorbed carbon column until the pH of the effluent = 1, and then pass Rinse with tap water until the pH of the effluent = 4, and wait for feeding. The obtained L-tyrosine crude product was decolorized and refined according to conventional methods to obtain a finished product of L-tyrosine with a dry weight of 75kg. The product has an optical rotation of -11.2°, a light transmittance of 96.7%, and a content of 100.2%. Take t...
Embodiment 3
[0018] The same solution as Example 1, adjusted to pH=3 with quicklime, with a flow rate of 2.0m 3 / h is passed through the exchange tower treated in Example 2, and the tower effluent is detected with sulfuric acid formaldehyde test, and blue color stops entering the liquid, and then with a flow rate of 2.0m 3 / h into 7% dilute NaOH solution, collected eluate 6m 3 , concentrated hydrochloric acid to neutralize the eluent to pH=5.5, stir to crystallize, and centrifuge to obtain 128 kg of L-tyrosine crude product. Pass 7% hydrochloric acid into the desorbed carbon column until the effluent pH=0.5, and then pass Rinse with tap water until the pH of the effluent = 3.5, and wait for feeding. The obtained L-tyrosine crude product was decolorized and refined according to conventional methods to obtain a finished product of L-tyrosine with a dry weight of 73kg. The product has an optical rotation of -11.4°, a light transmittance of 96.6%, and a content of 100.2%. The discharge liqu...
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