Introduction
Citric acid, at room temperature, is a white crystalline powder. It can exist either in an anhydrous form or as a monohydrate. The anhydrous form crystallizes from hot water, whereas the monohydrate forms when citric acid is crystallized from cold water. The monohydrate can be converted to the anhydrous form by heating above 78 °C. Citric acid also dissolves in absolute (anhydrous) ethanol (76 parts of citric acid per 100 parts of ethanol) at 15 degrees Celsius.
In chemical structure, citric acid shares the properties of other carboxylic acids. When heated above 175°C, it decomposes through the loss of carbon dioxide and water. Citric acid leaves a white crystalline
precipitate.
Product Identification
Product name: Citric acid anhydrous
Synonyms: 2-Hydroxy-1,2,3-propanetricarboxylic acid, 2-Hydroxytricarballylic acid
Molecular Formula: C 6 H 8 O 7
Molecular Weight: 192.12
Molecular structure: →
CASE NO: 77-92-9
Product Grade: Food grade
Physical & Chemical Properties
Citric acid is a colorless translucent crystals or white granules or white crystalline powder, no smell. Soluble in water, ethanol, ethyl ether, insoluble in benzene, slightly soluble in chloroform.
Citric acid is a strong organic acids, there are three H + can be ionization; when heated can be decomposed into variety of products; it can reacted with acid, alkali, glycerol, etc.
Application
As a food additive, citric acid is used as a acidulating, flavoring and preservative in food and
beverages, especially soft drinks. It is denoted by E number E330.
Citric acid is used in biotechnology and the pharmaceutical industry to passivate high-purity process piping (in lieu of using nitric acid). Nitric acid is considered hazardous to dispose once used for this purpose, while citric acid is not.
It is also used as antioxidant, plasticizer, detergent and builder.
Packing
1). Net 25 kg kraft bags
2). Net 25 kg carton
3). According to customers' requirement
Quality standard ( see table )
The quality conforms to BP / USP / FCC / E330 Standard.
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Citric acid anhydrous index
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Items
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Index
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Content
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99.5%-101%
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Moisture
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≤0.5%
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Sulphated Ash
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≤0.05%
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Sulphate
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≤150 ppm
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Oxalate
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≤350 ppm
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Arsenic
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≤1 ppm
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Heavy metal
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≤10 ppm
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Lead
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≤1 ppm
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Mercury
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≤1 ppm
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Iron
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≤50 ppm
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Chloride
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≤50 ppm
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Aluminum
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≤0.2 ppm
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Bacterial endotoxin
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≤0.5 IU/mg
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Barium
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Pass test
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Readily carbonisable substances
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Standard color
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Clarity and colour of solution
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20% water solution clarity
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Shelf life
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2 years
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