Overview
Adipic acid is an organic compound and one of the most important aliphatic dicarboxylic acids in industrial chemistry. As a monomer, it plays a critical role in condensation polymerization reactions, particularly in the production of nylon 6,6. The global production exceeds 2.5 million tons annually, making it a commodity chemical with significant economic importance. First synthesized in the late 19th century, modern production primarily occurs through the oxidation of cyclohexane or phenol. Its versatility extends beyond polymer applications, serving as an intermediate in various chemical syntheses and even finding use as a food additive where it functions as an acidity regulator.
Physical and Chemical Properties
Adipic acid presents as a white, odorless crystalline solid at room temperature with a slightly acidic taste. Its molecular structure features two carboxyl groups separated by a four-carbon chain, giving it characteristic properties of both aliphatic hydrocarbons and carboxylic acids. The compound demonstrates moderate solubility in water (14 g/L at 20°C) with solubility increasing significantly with temperature. In organic solvents, it dissolves readily in alcohols and acetone. When heated to decomposition, it emits acrid smoke and irritating fumes. A notable chemical property is its ability to form salts (adipates) with various metals, which find applications as catalysts and stabilizers.
Main Applications
Approximately 85% of global adipic acid production is dedicated to nylon 6,6 manufacturing, where it reacts with hexamethylenediamine to form the polymer. This application alone drives significant demand from the textile and automotive industries for fibers and engineering plastics. Other important uses include: polyurethane production (as a chain extender), plasticizers for PVC (particularly in wire and cable insulation), and as a food additive (E355) for acidity regulation in gelatins and powdered drinks. Emerging applications include biodegradable polymers and as a precursor for pharmaceutical intermediates, though these currently represent smaller market segments.
Safety and Storage
While classified as generally low in toxicity, adipic acid requires proper handling to prevent irritation. Dust may cause mild eye and respiratory tract irritation, necessitating appropriate PPE including safety glasses and dust masks during bulk handling. Storage should be in original packaging or approved containers in dry, well-ventilated areas away from strong oxidizers. The material is stable under normal conditions but may form explosive dust-air mixtures at high concentrations. Spills should be contained and cleaned promptly with water, as the compound is biodegradable and presents minimal environmental hazard when properly managed.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 99.5% or higher for polymer applications), particle size distribution, and moisture content when ordering. Packaging options range from 25kg bags to bulk shipments in containers or silo trucks for large-volume consumers. Quality verification should include certificates of analysis for purity, heavy metal content, and color index. Consider supplier capabilities for just-in-time delivery and technical support, especially for manufacturers requiring consistent feedstock for continuous polymerization processes. Current market prices fluctuate with raw material (cyclohexane) costs and regional supply-demand dynamics.
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