US 12,017,182 B2 · Method and system for refining long chain dicarboxylic acid

Abstract

The present disclosure provides a system for refining long chain dicarboxylic acid, comprising: a first membrane filtration unit, for a first membrane filtration of a long chain dicarboxylic acid fermentation broth or a treated liquid therefrom; a first decolorization unit, for carrying out a first decolorization treatment to the filtrate obtained after the membrane filtration; a first acidification/crystallization unit, for carrying out a first acidification/crystallization of a filtrate obtained after the membrane filtration to give a solid-liquid mixture; a first separation unit, for a solid-liquid separation of the solid-liquid mixture; a drying unit, for drying the solid separated by the separation unit to give a first solid. By using the refining system according to the present disclosure, the purity of the obtained product is high, and the disadvantages such as poor quality of the product obtained by crystallization from a solvent and environment pollution caused by a solvent can be overcome.

Claims31

Dependent claims

A system for refining long chain dicarboxylic acid, comprising:

a first membrane filtration unit, for a first membrane filtration of a long chain dicarboxylic acid fermentation broth or a treated liquid therefrom;
a first decolorization unit, for carrying out a first decolorization treatment to the filtrate obtained after the membrane filtration;
a first acidification/crystallization unit, for carrying out an acidification/crystallization of a filtrate obtained after the membrane filtration to give a solid-liquid mixture;
a first separation unit, for a solid-liquid separation of the solid-liquid mixture;
a drying unit, for drying the solid separated by the separation unit to give a first solid;
wherein a microfiltration membrane filtration device comprising a microfiltration membrane, an ultrafiltration membrane filtration device comprising an ultrafiltration membrane, and a cooling device are disposed in the first membrane filtration unit;
after the microfiltration membrane filtration, the resulted filtrate from the fermentation broth or the treated liquid therefrom is cooled to 20 to 45° C. in the cooling device, and subjected to the ultrafiltration membrane filtration.

4 more elements

A system for refining long chain dicarboxylic acid, comprising:

a first membrane filtration unit, for a first membrane filtration of a long chain dicarboxylic acid fermentation broth or a treated liquid therefrom;
a first decolorization unit, for carrying out a first decolorization treatment to the filtrate obtained after the membrane filtration;
a first acidification/crystallization unit, for carrying out an acidification/crystallization of a filtrate obtained after the membrane filtration to give a solid-liquid mixture;
a first separation unit, for a solid-liquid separation of the solid-liquid mixture;
a drying unit, for drying the solid separated by the separation unit to give a first solid;
a vacuum distillation unit, for carrying out separation by distillation on the first solid to obtain a second solid;
wherein a pressure of the vacuum distillation is ≤100 Pa;
and the vacuum distillation unit comprises a rectifying column for carrying out a high vacuum distillation, and
wherein the number of plates of the rectifying column is 8 to 24, and/or,
the rectifying column has an overhead pressure of 1 to 100 Pa, and/or,
the rectifying column has an overhead temperature of 160 to 250° C., and/or,
the rectifying column has a bottom temperature of 180 to 270° C., and/or,
the rectifying column has a reflux ratio of (1 to 10):1.

10 more elements

Dependencies are inferred from the claim text.

Method and system for refining long chain dicarboxylic acid

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Method and system for refining long chain dicarboxylic acid

Life of this patent

Abstract

Claims31