Method for using dried potato flour to prepare potassium citrate

Abstract

The invention discloses a method for using dried potato flour to prepare potassium citrate, comprising the following steps of grinding dried sweet potatoes or tapioca chips into 60 to 80 class, making into a pasty mixture according to a proportion of 1: 4 to 5 of flour and water, pumping the mixture into a fermentation tank, adding amylase and ammonium sulphate into the fermentation tank, liquefying the starch by rising temperature, lowering the temperature to 39 degrees after sterilization and disinfection, adding aspergillus niger that is a fermenting culture of citric acid to implement fermentation for 55 to 60 hours, heating the mixture to 70 to 80 degrees, getting fermentation liquor containing citric acid through separation, adding the aspergillus niger into the fermentation tank to implement fermentation after liquidation, sterilization and disinfection through rising temperature, and using the fermented fermentation liquor containing citric acid to prepare calcium citrate by a method of 'calcium salts' and further to prepare potassium citrate through adding potassium carbonate. Compared with the method for preparing potassium citrate through the reaction of finished citric acid and potassium hydrate, the invention directly extracts potassium citrate from the fermentation liquor, has the advantages of low production cost, high economic profit, short flow of production, less production waste and less environmental pollution, and can reduce the production cost by 20 to 30 percent.

Description

technical field [0001] The invention relates to a method for preparing potassium citrate by using dried sweet potatoes or dried cassava as raw materials. Background technique [0002] The usual method for preparing potassium citrate is: dried potato→crushing→pulping→fermentation→pressing→neutralization→acidolysis→separation→concentration→crystallization→drying to produce citric acid, and then citric acid and potassium hydroxide Or potassium carbonate is used as a raw material to produce potassium citrate through processes such as neutralization→decolorization→impurity removal→concentration→crystallization→drying by simple neutralization reaction. This kind of method has a long technological process, relatively large environmental pollution, and too much waste. In addition, the production cost is too high and has no practical production significance. Contents of the invention [0003] The purpose of the present invention is to provide a method for producing potassium citra...

AI Technical Summary

Problems solved by technology

This method has a long process flow, high environmental pollution, and too much waste. In addition, the production cost is too high and has no practical production significance.