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CALCIUM FERROCYANIDE

CAS Number: 13821-08-4
EC Number: 237-508-9
E number: E538 (acidity regulators)
Chemical formula: C6Ca2FeN6
Molar mass: 292.109 g·mol−1

APPLICATIONS

Calcium ferrocyanide is used as anti-caking agent. 
Calcium ferrocyanide is Known as E-538 food additive. 
Because of the strong chemical bond between iron and the cyanide groups, Calcium ferrocyanide has a low toxicity. 
Sodium ferrocyanide (E 535), potassium ferrocyanide (E 536) and calcium ferrocyanide (E 538) are permitted in salt and its substitutes at the level of 20 mg/kg (calculated as anhydrous potassium ferrocyanide) individually or in combination.
Calcium ferrocyanide is Used to remove metallic impurities from citric, tartaric, and other acids.

Calcium ferrocyanide is used to remove metallic impurities from tartaric, citric, and other acids. 
Also Calcium ferrocyanide is used as a stabilizer for the coating on welding rods, and fertilizer for plants. 
Other applications of calcium ferrocyanide include removal of mercaptans in the petroleum industry; production of wine and citric acid; fixing, toning, and bleaching in photography; separation of copper from molybdenum ores and purification of tin; and anti-caking agent for both table salt and road salt. 

In the past, calcium ferrocyanide was produced from organically derived nitrogenous carbon sources, potassium carbonate, and iron filings. 
Historically, common carbon and nitrogen sources were offal, leather scrap, dried blood, or torrified horn. 
The global calcium ferrocyanide market is growing at a significant growth over the forecast period, owing to rapid growth of anti-caking in pharmaceutical industry. The Asia-Pacific calcium ferrocyanide market accounts for relatively high revenue share, followed by North America calcium ferrocyanide market, attributed high demand of fertilizers in agriculture.

Anti-caking Agent - Calcium ferrocyanide Prevents lumps from forming in food due to excess water. 
They usually function as a water repellent or by absorbing excess moisture.
Calcium ferrocyanide is prepared from hydrogen ferrocyanide and calcium hydroxide. 
Calcium ferrocyanide is an anti-caking agent used in producing table salt, which can keep the salt from clumping so that it pours out of the saltshaker with greater ease. 

Calcium ferrocyanide is an approved food additive in EU with E number 538.
In food manufacture, Calcium ferrocyanide is used as an anti-caking agent.
Calcium Ferrocyanide is prepared from hydrogen ferrocyanide and calcium hydroxide.
Calcium Ferrocyanide is used as anti-caking agent in food industry.

Calcium Ferrocyanide, whether in food grade or industrial form, has a wide range of uses in a variety of sectors. 
In the manufacturing industry, calcium ferrocyanide is employed on a wider scale. 
Calcium Ferrocyanide is widely utilised in the manufacturing industry for a variety of purposes, including as a stabilising chemical and a separating agent.

Based on the end-use, the global calcium ferrocyanide market is segmented into:

-Food Products
-Agricultural products
-Pharmaceutical Products
-Petroleum
-Photography
-Wine Production
-Welding Rods

Based on the application, the global calcium ferrocyanide market is segmented into:

-Stabilizer
-Fertilizer
-Anti-caking Agent


DESCRIPTION

Calcium ferrocyanide is an inorganic compound with the formula Ca2[Fe(CN)6]. 
Calcium ferrocyanide is the Ca2+ salt of [Fe(CN)6]4-, ferrocyanide complex ion. 
A yellow solid, Calcium ferrocyanide is used as a precursor to the pigment Prussian blue.
Calcium ferrocyanide belongs to the class of organic compounds known as transition metal cyanide salts. 
These are organic compounds containing a transition metal and a cyanide ion [C-]#N.

Calcium ferrocyanide is an inorganic metallic compound produce from the ferrous chloride, hydrogen cyanide, and calcium hydroxide. 
Calcium ferrocyanide is odorless, yellow crystalline granules which are soluble in water. 
Also, Calcium ferrocyanide is known by the common name yellow prussiate of lime with INS No. Calcium salt E538. 
Calcium ferrocyanide is also known as Dicalcium hexacyanoferrate or Calcium hexacyanoferrate. 

Calcium ferrocyanide is Yellow crystals soluble in water. 


PURIFICATION METHODS

Recrystallise it three times from conductivity H2O and dry it in air to constant weight over the partially dehydrated salt. 
Alternatively the Ca salt can be purified by precipitation with absolute EtOH in the cold (to avoid oxidation) from an air-free saturated aqueous solution. 
The pure lemon yellow crystals are centrifuged, dried in a vacuum desiccator first over dry charcoal for 24hours, then over partly dehydrated salt and stored in a dark glass stoppered bottle.

No deterioration occurred after 18 months. 
No trace of Na, K or NH4 ions could be detected in the salt from the residue after decomposition of the salt with conc H2SO4. 
Analyses indicate 11mols of H2O per mol of salt. 
The solubility in H2O is 36.45g (24.9o) and 64.7g (44.7o) per 100g of solution. 

SAFETY

Calcium ferrocyanide was listed in 2012 by the EU as a "Food Improvement Agent".
In the EU, ferrocyanides (E 535–538) were, as of 2018, solely authorised in two food categories as salt substitutes. 
Kidneys are the organ for ferrocyanide toxicity.


SYNONYMS

Dicalcium hexakis(cyano-κC)ferrate(4-)
Calcium ferrocyanide
13821-08-4
dicalcium;iron(2+);hexacyanide
UNII-906D36VLZG
906D36VLZG
 

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