A method for extracting succinic acid diester from succinic acid fermentation broth
A technology for succinic acid diester and succinic acid, which is applied in the field of extracting succinic acid diester, can solve the problems of complex separation process of bio-based succinic acid, and achieve the effects of high purity and low production cost
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Embodiment 1
[0026] Take 100L of sodium salt fermentation broth with a succinic acid concentration of 45.0g / L and filter it through a 0.2μm microfiltration membrane and an ultrafiltration membrane with a molecular weight cutoff of 5000 Daltons to remove bacteria and large particle suspensions to obtain an ultrafiltrate 98L, the concentration was 45.3g / L, and the ultrafiltrate was concentrated until the mass concentration of succinic acid was 60%, to obtain 7.4L of concentrated solution. Mix the above concentrate with 12.0kg of methanol, add 2.5kg of sulfuric acid, stir at 58°C for 30 minutes, filter the precipitate containing sodium sulfate to obtain 19.0kg of esterified clear liquid, rectify at 0.05MPa to obtain butanediol with a purity of 99.2% Acid dimethyl ester 5.2kg.
Embodiment 2
[0028] Take 100L of sodium salt fermentation broth with a succinic acid concentration of 45.0g / L and filter it through a 0.2μm microfiltration membrane and an ultrafiltration membrane with a molecular weight cutoff of 5000 Daltons to remove bacteria and large particle suspensions to obtain an ultrafiltrate 98L, the concentration was 45.3g / L, and the ultrafiltrate was concentrated until the mass concentration of succinic acid was 60%, to obtain 7.4L of concentrated solution. Mix the above concentrate with 17.0kg of ethanol, add 2.5kg of sulfuric acid, stir at 58°C for 30min, filter the precipitate containing sodium sulfate to obtain 21.6kg of esterified clear liquid, rectify at 0.05MPa to obtain butanediol with a purity of 99.3% Acid diethyl ester 6.2kg.
Embodiment 3
[0030] Take 100L of sodium salt fermentation broth with a succinic acid concentration of 45.0g / L and filter it through a 0.2μm microfiltration membrane and an ultrafiltration membrane with a molecular weight cutoff of 5000 Daltons to remove bacteria and large particle suspensions to obtain an ultrafiltrate 98L, the concentration was 45.3g / L, and the ultrafiltrate was concentrated until the mass concentration of succinic acid was 60%, to obtain 7.4L of concentrated solution. Mix the above concentrate with 23.0kg of n-propanol, add 2.5kg of sulfuric acid, stir at 60°C for 30 minutes, filter the precipitate containing sodium sulfate to obtain 27.2kg of esterified clear liquid, and rectify at 0.03MPa to obtain 99.5% purity Di-n-propyl succinate 7.0kg.
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