Adipic Acid

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Submitted By karansingla
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Nylons comes in many types but the most common and widely used in textile and plastic industries are Nylon 6 and Nylon 6,6. Nylon 6,6 is made up of two monomers each containing 6 carbon atoms. One of them is Adipic Acid which is a dicarboxylic acid. It is manufactured by oxidation of Cyclohexanol which is produced by oxidative cleavage of cyclohexane or by hydrogenation of phenol. Commercially Cyclohexane is preferred as raw material because of its lower cost and a two-step mechanism involving Nitric acid is used to produce Adipic Acid. This process has higher selectivity and yield than other processes. The only concern with this process is the emission of nitrogen oxides in the gas effluents which is a major environmental concern.

1. Introduction
Adipic acid is an organic compound, with formula HOOC (CH2)4COOH, which is a white crystalline solid and one of the most important Dicarboxylic acid. It is Odorless, Colorless and freely soluble in Ethanol, Methanol and Acetone. Other Important properties of Adipic acid is shown in Table 1.From Industrial perspective it is used mainly in Nylon-6, 6 production. About 2.5 billion kilograms of this white crystalline powder are produced annually. In US it is mainly produced by three companies at four manufacturing plants, with nearly two-thirds of the total production, 860,000 tons capacity occurring at DuPont's two Texas facilities. The use of adipic acid in food items have started in recent times and this has created a demand of purer product. Properties | Value | Boiling Point (760mm Hg) | 337oC | Melting Point | 152oC | Flash Point (closed cup) | 196oC | Solubility in water (15oC) | 1.4 gm/100ml | Density (20oC) | 1.36gm/cm3 | pKa1 &pKa2 | 4.43 & 5.41 | pH of Satd. Sol. (25oC) | 2.7 | Viscosity (160oC) | 4.54cP | Relative Vapor Density | 5.04 |

2. Manufacturing processes

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