A method for extracting and refining long-chain dicarboxylic acids from fermentation broth
A long-chain dicarboxylic acid and fermentation broth technology, which is applied in the separation/purification of carboxylic acid compounds, carboxylate preparation, chemical instruments and methods, etc., and can solve the problems of high energy consumption and large loss of dicarboxylic acids , to achieve the effect of good product quality, improved solubility, and small crystal particles
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Embodiment 1
[0030] (1) Take 0.5m of dodecyl dicarboxylic acid fermentation liquid 3 Add to 1m3 In a closed container with stirring, add potassium hydroxide to the fermentation broth to make the pH of the fermentation broth 9, stir at 100rpm, continue to heat up to 90°C, and keep the temperature constant for 20min;
[0031] (2) After the treatment in step (1), filter through a 20 nm membrane filtration device to obtain the fermentation clear liquid into 0.7m 3 In the fermentation clear liquid tank, let it stand at a constant temperature of 80°C for 20 minutes, and remove the aqueous phase clear liquid layer;
[0032] (3) Inject 380L aqueous phase clear liquid layer into 1m 3 In a closed container with stirring and heating, add 100L butyl ether at a temperature of 80°C and a speed of 100rpm, and raise the temperature to 90°C; then add sulfuric acid to control the pH of the system to 5, raise the temperature to 97°C, and increase the speed to 200rpm until the system Medium and long chain d...
Embodiment 2
[0035] (1) Take 0.5m of thirteen carbon dicarboxylic acid fermentation broth 3 join 1 m 3 In a closed container with stirring, add potassium hydroxide to the fermentation broth to make the pH of the fermentation broth to 10, stir at 100 rpm, continue to heat up to 80 ° C, and keep the temperature for 30 minutes;
[0036] (2) After the treatment in step (1), filter through a 40nm membrane filtration device to obtain the fermentation clear liquid into 0.7 m 3 Fermentation clear liquid tank, let it stand at a constant temperature of 90°C for 20 minutes, and remove the aqueous phase clear liquid layer;
[0037] (3) Inject 380L aqueous phase clear liquid layer into 1m 3 In a closed container with stirring and heating, add 80L ethyl acetate at a temperature of 85°C and a speed of 150rpm, and heat up to 90°C; then add sulfuric acid to control the pH of the system to 4, heat up to 97°C, and increase the speed to 200rpm until The long-chain dicarboxylic acid is completely dissolved ...
Embodiment 3
[0040] (1) Take 0.5m of dodecyl dicarboxylic acid fermentation liquid 3 Add to 1m 3 In a closed container with stirring, add sodium hydroxide to the fermentation broth to make the pH of the fermentation broth 9.5, stir at 100rpm, continue to heat up to 90°C, and keep the temperature constant for 30min;
[0041] (2) After the treatment in step (1), filter through a 25nm membrane filtration device to obtain the fermentation clear liquid into 0.7m 3 Fermentation clear liquid tank, let it stand at a constant temperature of 80°C for 30 minutes, and remove the phase water phase clear liquid layer;
[0042] (3) Inject 350L aqueous phase clear liquid layer into 1m 3 In a closed container with stirring and heating, add 100L propyl ether at a temperature of 80°C and a speed of 100rpm, and raise the temperature to 85°C; then add sulfuric acid to control the pH of the system to 5, raise the temperature to 97°C, and increase the speed to 200rpm until the system Medium and long chain dic...
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