Maltol[4]

Updated: 2026-10-22

Overview

Furfural is an organic compound derived from agricultural byproducts like corncobs, oat hulls, and sugarcane bagasse through acid hydrolysis. It is a versatile platform chemical primarily used as a solvent and a precursor for resins, plastics, and biofuels. First isolated in 1832, furfural gained industrial importance in the early 20th century due to its role in producing synthetic rubber and nylon intermediates. Today, it is a critical raw material in petrochemical refining, foundry sand binders, and pharmaceutical manufacturing.

Physical and Chemical Properties

Furfural is a colorless to pale-yellow liquid with a characteristic almond-like odor. It has a density of 1.16 g/cm³ and boils at 161.7°C, making it volatile under standard conditions. Its polarity and solvent properties stem from the aldehyde functional group (-CHO) and the furan ring structure. The compound is highly reactive, undergoing condensation, oxidation, and polymerization reactions. It is miscible with most organic solvents but has limited solubility in water (8.3 g/100 mL at 20°C). Furfural is thermally stable but decomposes at temperatures above 250°C.

Main Applications

Furfural is widely used as a selective solvent in lubricating oil refining to extract aromatic compounds. In the chemical industry, it serves as a precursor for furfuryl alcohol (used in resins) and tetrahydrofuran (a polymer solvent). Other applications include production of foundry sand binders (furan resins), agricultural chemicals, and flavoring agents. Emerging uses encompass biofuel synthesis (e.g., furanic diesel additives) and biodegradable plastics. Its derivatives are essential in pharmaceuticals, such as nitrofurantoin, an antibiotic.

Safety and Storage

Furfural is a flammable liquid (flash point: 61°C) and requires storage in cool, well-ventilated areas away from ignition sources. Use corrosion-resistant containers (e.g., stainless steel or polyethylene-lined steel) due to its mild acidity. Exposure risks include skin/eye irritation and respiratory discomfort. OSHA’s permissible exposure limit (PEL) is 5 ppm (20 mg/m³). Handling mandates gloves, goggles, and respirators. Spills should be contained with absorbents like vermiculite and disposed of as hazardous waste.

B2B Procurement Guide

When sourcing furfural, prioritize suppliers with ISO or REACH certification to ensure quality and regulatory compliance. Key specifications include purity (≥99% for industrial use), water content (<0.1%), and acidity levels. Procurement options include bulk tankers (for large-scale users) or 200L steel drums (smaller quantities). Prices fluctuate based on feedstock (e.g., sugarcane vs. corncob-derived) and global demand. For reference, contract prices in 2023 ranged from $1,200–$1,800 per metric ton. Negotiate long-term agreements to mitigate market volatility.

FAQ

[{"Q": "What is the shelf life of furfural?", "A": "Properly stored (in sealed containers, away from light/heat), furfural remains stable for 2–3 years. Degradation signs include darkening color and increased acidity."}, {"Q": "Can furfural be used as a biofuel?", "A": "Yes, furfural derivatives like 2-methylfuran (2-MF) are researched as gasoline additives due to high energy density and octane rating."}, {"Q": "How is furfural toxicity managed in workplaces?", "A": "Implement ventilation systems, monitor airborne concentrations, and provide PPE (respirators, chemical gloves) per OSHA guidelines."}, {"Q": "What substitutes exist for furfural in resins?", "A": "Phenol-formaldehyde resins can replace furan resins in some applications, though with trade-offs in biodegradability and thermal stability."}, {"Q": "Which industries consume the most furfural?", "A": "Petrochemical refining (50%), foundry resins (30%), and agrochemicals (15%) dominate global demand."}, {"Q": "Is furfural biodegradable?", "A": "Yes, furfural breaks down in aerobic environments, with a half-life of 5–30 days in soil/water, but high concentrations may inhibit microbial activity."}, {"Q": "What packaging is best for furfural exports?", "A": "Use UN-certified stainless steel isotanks or epoxy-lined drums to prevent contamination and corrosion during transit."}]