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Adipic acid is an aliphatic dicarboxylic acid with the formula (CH2)4(COOH)2. It is a white, crystalline compound with a slight acid taste and very faint odor. Its solubility is very low in water and soluble in organic solvents like alcohol and acetone. It is mainly as a precursor for the production of nylon.

Large amount is produced by oxidation of cyclohexane with air, nitric acid and metal catalyst. Adipic acid occurs naturally only in low quantities in the environment.

Adipic acid is an approved food additive; however, the dominating use is for polymerisation. Different types of polyesters are produced with the help of adipic acid and they are used as a binder in paint, adhesives and for paper chemicals. It is a precursor for many polymers, by polymerise with polyalcohol such as ethylene glycol to polyester which often reacts further with ioscyanates to form polyurethanes.

Esters of adipic acid are also produced with alcohols with 8-10 carbon and these compounds are called as adipates. The adipates are used as softeners in plastic and as synthetic grease base oils.

In medicinal field this compound is used for the formulation of matrix tablets to regulate pH independent release of both weakly acid and weakly acidic drugs. Trace amounts of adipic acid is used as a food ingredient as a flavoring and gelling aid and as a acidification additive in food. It is also used in surface coating with unsaturated polyester as a binder.

Adipic Acid
Adipic Acid is a white, crystalline compound with a slight acid taste and a nil to very faint odor. Slightly soluble in water and soluble in alcohol and acetone. It is mainly as a precursor for the production of nylon. Adipic acid is a white crystalline powder (monoclinic system)
Adipic acid occurs rarely naturally in the environment. Large amount is produced by oxidation of cyclohexane (which is produced from the petroleum product benzene or butadiene) with air, nitric acid and metal catalyst.
 
Preparation
Adipic acid was prepared by the oxidation of various fats. Nowadays adipic acid is produced from a mixture of cyclohexanol and cyclohexanone called “KA oil”, the abbreviation of “ketone-alcohol oil.” The KA oil is oxidized with nitric acid to give adipic acid, via a multistep pathway. Early in the reaction the cyclohexanol is converted to the ketone, releasing nitrous acid:
HOC6H11 + HNO3 → OC6H10 + HNO2 + H2O
HNO2 + HNO3 → NO+NO3- + H2O
OC6H10 + NO+ → OC6H9-2-NO + H+

Chemical applications
Adipic acid can also polymerise with polyalcohol such as ethylene glycol to polyester which often reacts further with ioscyanates to form polyurethanes.
Different types of polyesters are produced with the help of adipic acid and they are used as a binder in paint, adhesives and for paper chemicals.

Medical uses:
Adipic acid is used in the field of medicine incorporated for the formulation matrix tablets to obtain pH-independent release for both weakly basic and weakly acidic drugs. It is also been incorporated into the polymeric coating of hydrophilic monolithic systems to modulate the intragel pH, resulting in zero-order release of a hydrophilic drug. When this acid was used as a pore-forming agent without affecting release in the acidic media.

Adipic Acid uses in food
Significant amounts of adipic acid is used as a food ingredient as a flavorant and gelling aid. It is used in some calcium carbonate antacids to make them tart.

Other applications of Adipic Acid
• Polyamide polymers
• polyurethane systems
• organic synthesis
• plasticizers
• adhesives
• paints
• flexible and rigid foams
• detergency.

Other Uses
Adipic acid is approved as a food additive; however, the dominating use is for polymerisation. Different types of polyesters are produced with the help of adipic acid and they are used as a binder in paint, adhesives and for paper chemicals.
Adipic acid can also polymerise with polyalcohol such as ethylene glycol to polyester which often reacts further with ioscyanates to form polyurethanes.
Smaller esters of adipic acid are produced with alcohols with 8-10 carbon. These are called adipates. These are used as softeners in plastic (such as PVC) and as synthetic grease base oils (“synthetic esters”). In the latter use branched carbon chains are preferred since it gives better floating properties.

Toxicity
Adipic acid has very low acute toxicity in rats with an LD50 > 5000 mg/kg. Adipic acid produced mild to no skin irritation. It was not a skin sensitizer. Adipic acid dust may irritate the mucous membranes of the lungs and nose. Adipic acid is not genetically active in a wide variety of assay systems. Adipic acid is partially metabolized in humans; the balance is eliminated unchanged in the urine. Adipic acid is slightly to moderately toxic to fish, daphnia, and algae in acute testsH2S odours generated during sludge processing can cause community complaints and make plant working conditions unpleasant. Furthermore, damage to equipment and concrete structures caused by H2S initiated corrosion can be substantial. Typical areas where H2S problems occur include gravity thickeners, mix tanks, and dewatering presses.

PRODUCT IDENTIFICATION

CAS NO. : 124-04-9
Formula : C6H10O4
MOL Mass. : 146.14 g/mol

PHYSICAL AND CHEMICAL PROPERTIES

Appearance : White Crystals(monoclinic)
Odour : Slightly Sharp
Solubility in water : fairly Soluble
Acidity : 4.43,5.

SALES SPECIFICATION

MELTING POINT : 152.1°C,425 K,306°F
BOILING POINT : 337.5°C,611 K,640°F
SOLUBILITY IN WATER : fairly soluble
Density :1.36g/cm³

DESCRIPTION OF ADIPIC ACID

Adipic Acid is the organic compound with the formula (CH2)4(COOH)2. It is a white, crystalline compound with a slight acid taste and a nil to very faint odor. Slightly soluble in water and soluble in alcohol and acetone. It is mainly as a precursor for the production of nylon. Adipic acid is a white crystalline powder (monoclinic system)
Adipic acid occurs rarely naturally in the environment. Large amount is produced by oxidation of cyclohexane (which is produced from the petroleum product benzene or butadiene) with air, nitric acid and metal catalyst. The result is a mixture of mainly hexanedicarboxylic acid. In a subsequent purification step, formed dimethyl esters are removed by distillation. Technical adipic acid is one of the cleanest substances made in large quantities is the simplest peroxide (a compound with an oxygen-oxygen single bond).
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PRODUCT IDENTIFICATION

CAS NO. : 124-04-9
Formula : C6H10O4
MOL MASS. : 146.14g/mol

PHYSICAL AND CHEMICAL PROPERTIES

Appearance(As Adipic Acid) : White Crystals(monoclinic)
Odour : Slightly Sharp
Density : 1.36 g/cm³
solublity in water : fairly soluble
IUPAC NAME : hexanedioic acid
Acidity(p/Ka) : 4.43,5.
Other name : hexane-1,6-dioic acid

SALES SPECIFICATION

MELTING POINT : 152.1°C,425K,306°F
BOILING POINT : 337.5°C,611 K,640°F
SOLUBILITY IN WATER : Fairly Soluble

DESCRIPTION OF ADIPIC ACID

Adipic Acid is the organic compound with the formula (CH2)4(COOH)2. It is a white, crystalline compound with a slight acid taste and a nil to very faint odor. Slightly soluble in water and soluble in alcohol and acetone. It is mainly as a precursor for the production of nylon. Adipic acid is a white crystalline powder (monoclinic system)
Adipic acid occurs rarely naturally in the environment. Large amount is produced by oxidation of cyclohexane (which is produced from the petroleum product benzene or butadiene) with air, nitric acid and metal catalyst. The result is a mixture of mainly hexanedicarboxylic acid. In a subsequent purification step, formed dimethyl esters are removed by distillation. Technical adipic acid is one of the cleanest substances made in large quantities.is the simplest peroxide (a compound with an oxygen-oxygen single bond) .
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