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Citric Acid
Time2018/8/3 16:42:46Page view1081

  Citric acid (CA for short) is an important organic acid, also known as citric acid. It is colorless crystal,

 often contains a molecule of crystal water, is odorless, has a strong acid taste,

 and is easily soluble in water. Its calcium salt is more soluble in cold water than hot water.

This property is commonly used to identify and isolate citric acid.

 Anhydrous citric acid can be obtained by controlling the proper temperature during crystallization.

 It has many uses in industry, food industry, makeup industry, etc.
Chinese name Citric Acid English name Citric Acid
Another name is citric acid (jyunsun)
Chemical formula C₆H₈O₇
Molecular weight: 192.13
CAS Registry Number
EINECS registration number 201-069-1
Melting point: 153
(Loss of water) boiling point 175
Water-soluble and easily soluble in water
Density 1.542g / cm³
Appearance white crystalline powder
Chemical name 3-Hydroxy-1,3,5-glutaric acid or 2-hydroxypropane-1,2,3-tricarboxylic acid
In the industrial production of citric acid, microbial fermentation is used, and only a few kinds of aspergillus and yeast are valuable.

 Aspergillus niger is a competitive species in the industry. Candida and Gibberella, etc.
It is cultured at room temperature for 10 to 14 days and becomes a rich and dense spore stalk.

 The colonies are black and sometimes dark brown black. Considering that citric acid-producing bacteria should have

 strong acid-producing ability and high citric acid-resistant concentration, Aspergillus niger can be separated by

 acid filter paper method, color circle method and monospore transplantation method to avoid interference by

other bacteria Becomes Aspergillus niger for citric acid production.
Normally, starch is the main source of citric acid. Firstly crush the starchy raw material, then add an appropriate amount

of water to the crushed raw material and stir, ferment the mixture, ferment the filtrate by fermentation, add calcium carbonate

 to the filtrate to neutralize the reaction, and filter out the calcium citrate Calcium citrate was subjected to acid hydrolysis

 using sulfuric acid and filtered, and the filtrate was decolorized by ion exchange, and then concentrated, crystallized,

 and dried to obtain white powdered citric acid.
Citric acid is the world's largest organic acid produced by biochemical methods.

Citric acid and salts are one of the pillar products of the fermentation industry.

 It is mainly used in the food industry, such as sour agents, solubilizers, buffers,

 antioxidants, Deodorant, flavor enhancer, gelling agent, toner, etc.
Citric acid belongs to the category of fruit acid. Its main function is to accelerate keratin regeneration.

 It is commonly used in lotions, creams, shampoos, whitening products, anti-aging products, and acne products.

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