High-efficiency acylation production method of L-methionine nonaqueous solution
A production method and a non-aqueous solution technology are applied in the field of high-efficiency production of L-methionine non-aqueous acylation, which can solve the problems that the traditional process cannot meet the requirements of economic indicators, the yield is low, the sewage discharge is large, and the comprehensive recycling process is reasonable and feasible. , the effect of purifying the environment and promoting ecological balance
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[0027] Example 1
[0028] (1) Take 50kg of DL-methionine and dissolve it in 200kg of acetic acid solution, add 55kg of acetic anhydride dropwise to carry out the acylation reaction to generate acylated DL-methionine; the temperature of the acylation reaction is 50°C and the time is 6 hours.
[0029] (2) The acylated DL-methionine solution is recovered by vacuum distillation of acetic acid. After recovering the acetic acid, add 1 / 6 volume of water to turn unreacted acetic anhydride into acetic acid. Continue to recover the acetic acid, and then add water to extract most of the remaining acetic acid to obtain The acylated DL-methionine solution was concentrated, and the content of acylated DL-methionine was 20% by weight.
[0030] (3) Concentrated acylated DL-methionine solution was added with 2kg aminoacylase Miqu enzyme (liquid), and the resolution reaction was carried out at a constant temperature (36°C). After the resolution reaction, the reaction solution was decolorized and conce...
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[0033] Example 2
[0034] (1) Take 50kg of DL-methionine and dissolve it in 250kg of acetic acid solution, add 60kg of acetic anhydride dropwise to carry out the acylation reaction to generate acylated DL-methionine; the temperature of the acylation reaction is 60°C and the time is 5 hours.
[0035] (2) The acylated DL-methionine solution is recovered by vacuum distillation of acetic acid. After recovering the acetic acid, add 1 / 5 volume of water to turn unreacted acetic anhydride into acetic acid, continue to recover the acetic acid, and then add water to extract most of the remaining acetic acid to obtain Concentrate the acylated DL-methionine solution, the content of acylated DL-methionine is 25% by weight.
[0036] (3) Concentrated acylated DL-methionine solution was added with 2kg aminoacylase Miqu enzyme (liquid), and the resolution reaction was carried out at a constant temperature (38°C). After the resolution reaction was completed, the reaction solution was decolorized and c...
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[0039] Example 3
[0040] (1) Take 50kg of DL-methionine and dissolve it in 280kg of acetic acid solution, add 65kg of acetic anhydride dropwise to carry out the acylation reaction to generate acylated DL-methionine; the temperature of the acylation reaction is 65°C and the time is 4 hours.
[0041] (2) The acylated DL-methionine solution is recovered by vacuum distillation of acetic acid. After recovering the acetic acid, add 1 / 4 volume of water to turn unreacted acetic anhydride into acetic acid. Continue to recover the acetic acid, and then add water to extract most of the remaining acetic acid to obtain Concentrate the acylated DL-methionine solution, and the content of acylated DL-methionine is 30% by weight.
[0042] (3) Concentrated acylated DL-methionine solution was added with 2kg aminoacylase Miquase (liquid), and the resolution reaction was carried out at a constant temperature (40°C). After the resolution reaction was completed, the reaction solution was decolorized and c...
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