A kind of citric acid extraction method and membrane bioreactor for producing citric acid

Abstract

The invention provides a citric acid extraction method and a membrane bioreactor for producing citric acid. The citric acid extraction method is characterized in that the membrane bioreactor with a movable liner is utilized, fermentation and membrane separation are integrated in the membrane bioreactor, the fermentation process and the membrane separation process are alternatively carried out in the membrane bioreactor, and citric acid is prepared and separated through three-times fermentation and membrane separation; a breeding bacterial strain is put in the membrane bioreactor filled with sterilized potato slag clinker, a proper proportion of nitrogen source rice bran (urea or ammonium sulfate) and calcium carbonate auxiliary materials, the first fermentation can reach 60-70% of fermentation depth, the second fermentation can reach about 80-85% of fermentation depth, and the third fermentation can reach about 90-95% of fermentation depth.

Description

technical field [0001] The invention relates to a chemical device and its use method, in particular to a membrane bioreactor for producing citric acid and a citric acid extraction process. Background technique [0002] Citric acid, also known as citric acid, is colorless, odorless, translucent crystal or white powder, easily soluble in water and alcohol. It is mainly used in the food industry, pharmaceutical industry, chemical industry, and also has a very wide range of applications in the fields of electronics, textiles, petroleum, leather, construction, photography, plastics, casting and ceramics. By 2010, the output of citric acid in my country has reached 1 million tons, accounting for about 53% of the world's total output, and the export is 850,000 tons, more than half of the world's total trade volume. Both output and trade volume rank first in the world. [0003] The traditional citric acid production process usually uses starch-rich crops such as corn and potatoes a...

AI Technical Summary

Problems solved by technology

The production process has problems such as complex process flow, serious environmental pollution, unstable product quality, and high production costs.

There are some problems in the traditional production process. First, the fermentation process is the core link of the citric acid production process. The fermentation is carried out in a fermenter. The traditional fermentation process has the following disadvantages: the citric acid selectivity of the strains used in the traditional fermentation is poor, and the fermentation broth The content of impurities such as sugar and protein in the medium is high, resulting in complex citric acid separation technology, low citric acid output, low raw material utilization rate, low product yield, and poor comprehensive economic benefits

The complex technological process, serious environmental pollution and high cost of citric acid production process have not been solved

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