A new process for treating waste mother liquor of itaconic acid fermentation using seawater desalination membrane separation technology

Abstract

The invention discloses a novel process of treatment of waste mother solution for itaconic acid fermentation through seawater desalination and membrane separation. According to the process, at first, inorganic anions in waste mother solution for itaconic acid fermentation are separated by an electrodialysis device, the itaconic acid mother solution is subjected to ionization with sodium hydroxide solution, the ionized itaconic acid mother solution is delivered by a centrifugal pump into a salt chamber of a bipolar membrane electrodialysis device, itaconic acid is produced through combination with hydrogen ions produced by a bipolar membrane, itaconic acid solution is repeatedly concentrated and crystallized, and itaconic acid is extracted. By adopting the process, the waste mother solution for itaconic acid fermentation can be made into resources, the total yield of the itaconic acid produced in a fermentation method can be increased, and the production cost can be reduced. Meanwhile, the sodium hydroxide solution used in the process can be repeatedly used, and no additional sodium hydroxide solution needs to be added continuously. Moreover, the process has the advantages of short flow, easiness in operation, no secondary pollution, low energy consumption and the like.

Description

technical field [0001] The invention relates to a method for extracting itaconic acid from itaconic acid fermentation waste mother liquor, in particular to a new process for extracting itaconic acid from itaconic acid fermentation waste mother liquor by using seawater desalination membrane separation technology. Background technique [0002] Itaconic acid, also known as methylene succinic acid, methylene succinic acid or decomposition aconitic acid, is an unsaturated dibasic organic acid. Itaconic acid contains two carboxyl groups (—COOH) and one methylene group (—CH2—) and contains unsaturated double bonds, which determines that it has very active chemical properties and can perform various addition reactions and esterification reactions It is a kind of chemical intermediate with very broad application prospect. [0003] At present, the production methods of itaconic acid include synthesis method and fermentation method, and the synthesis methods are mainly citric acid syn...

AI Technical Summary

Problems solved by technology

The citric acid synthesis method is not suitable for industrial use due to its high cost; the maleic anhydride synthesis method has the advantages of low production cost and high selectivity, but it has not yet been industrialized; and the fermentation method has easy-to-obtain raw materials and mature process technology, which is the most common method in industrial production in the world. method used

At present, the common domestic method for separating and extracting itaconic acid from fermentation broth is the recrystallization method. In the coarse crystallization stage, the mother liquor separated from the crystallization has been concentrated and crystallized two to three times. It cannot be recycled, and because it contains a large amount of impurities such as miscellaneous acids, residual sugars, pigments, proteins, etc., if it is returned to any link in the previous process, it will be difficult to separate these impurities, but will accumulate repeatedly in the process. So we can only give up and produce a lot of waste mother liquor

[0004] Itaconic acid waste mother liquor is one of the main wastes of itaconic acid production by fermentation method, and its main components are itaconic acid and residual sugar, SO4 2- , Cl - The content of inorganic anions is relatively high, the COD content reaches 304800mg / L, the BOD value is 60000mg / L, and the pH value is 2.0-2.5. Direct discharge not only pollutes the environment but also causes a waste of resources