Citric acid (Citric acid)

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Citric acid

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3'-hydroxybiphenyl-3-carboxylic acid
3-hydroxy-3-carboxy-pentanedioic acid
3'-hydroxy-3-biphenylcarboxylic acid
Citric acid
1,2,3-Propanetricarboxylic acid, 2-hydroxy-

+Expand -Stow

77-92-9

C6H8O7

192.124

2918140000

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Nature Description

White translucent crystal or powder. Relative density 1.665 (anhydrous). 1.542 (monohydrate), melting point 153℃ (anhydrous), refractive index 1.493-1.509, molar combustion heat (25℃): monohydrate 1.952MJ/mol, anhydrous 1.96MJ/mol. Odorless, sour, citric acid crystallized from cold solution contains 1 molecule of water, in dry air or heated to 40-50 ℃ to form anhydrous. It has slight deliquescence in humid air. It becomes soft at 75℃, melted at 100℃, soluble in water and ethanol, soluble in ether. Combustible.

1.542

153-154.5oC

100oC

750G/L(20oC)

Product Applications

It is used as experimental reagent, chromatographic analysis reagent and Biochemical reagent, as well as buffer preparation. It is used in food industry, especially as acidifier, PH buffer, and other compounds as preservation agent. In the detergent industry, it is an ideal phosphate substitute. Boiler chemical cleaning and pickling..

Production method

This product is mainly produced by fermentation, and its raw materials can use molasses, sucrose, sweet potato, petroleum hydrocarbon and other carbohydrates. Generally, fungi are used for fermentation production, which can be divided into surface fermentation and submerged fermentation according to fermentation methods. Surface fermentation is an early production method, and some Penicillium or Aspergillus niger are used as strains, the deep fermentation method also uses Aspergillus niger as a strain, and small spherical filamentous aggregates are generated during the fermentation process. The Growth and thin filamentous bacteria should be avoided. The fermentation conditions are pH 1.5-2.8, at the same time, sterile air should be introduced with stirring. After the fermentation is completed, the silk thallus and the remaining solid waste are filtered off. The filtrate is neutralized with calcium carbonate to obtain citrate of lime, then neutralized with concentrated sulfuric acid to obtain crude citric acid, and then refined with ion exchange resin, concentrate and crystallize to obtain the finished product. Deep fermentation is the main method, accounting for 80% of the fermentation production.

Security

Dangerous Goods Marking： Xi

Safety instructions： S26: in case of contact with eyes, rinse with plenty of water immediately and send it to the doctor for diagnosis and treatment. S37/39: use suitable gloves and goggles or mask.