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Anhydrous Chlorination

Updated: 2026-07-23

Overview

Anhydrous Aluminum Chloride (AlCl3) is a fundamental inorganic compound with significant industrial importance. It is primarily used as a catalyst in organic synthesis, especially in Friedel-Crafts alkylation and acylation reactions. The compound is highly reactive, particularly with water, necessitating careful handling and storage. First synthesized in the 19th century, AlCl3 has become indispensable in modern chemical manufacturing. Its ability to act as a Lewis acid makes it valuable in producing dyes, pharmaceuticals, and synthetic rubber. Industrial-grade AlCl3 typically has a purity of 98% or higher, with trace impurities varying by manufacturer.

Physical and Chemical Properties

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Anhydrous Aluminum Chloride appears as white or pale yellow crystals with a sharp odor. It sublimes at 180°C and melts under pressure at 192.4°C. The compound is highly hygroscopic, absorbing moisture from the air to form hydrated species or hydrogen chloride gas. As a strong Lewis acid, AlCl3 readily forms adducts with electron donors. It exhibits high solubility in polar organic solvents like nitrobenzene but reacts violently with water, releasing heat and corrosive HCl gas. These properties dictate its storage requirements and handling protocols.

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Main Applications

The primary use of Anhydrous Aluminum Chloride is as a catalyst in Friedel-Crafts reactions, which are pivotal in producing aromatic ketones and hydrocarbons. These reactions are foundational in manufacturing dyes, fragrances, and pharmaceuticals like ibuprofen. In the petrochemical industry, AlCl3 catalyzes alkylation processes to produce high-octane gasoline components. It also serves as a precursor for other aluminum compounds and finds niche applications in metallurgy and wastewater treatment. Emerging uses include its role in battery technology and specialty polymers.

Safety and Storage

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Due to its corrosive nature and water reactivity, AlCl3 requires strict safety measures. Personnel must wear acid-resistant gloves, goggles, and respirators when handling. Storage mandates airtight containers in cool, dry areas separate from water sources. Spills should be neutralized with dry soda ash or lime, never water. Fire hazards exist when AlCl3 contacts combustible materials. First aid for exposure includes flushing eyes/skin with water (after removing contaminated clothing) and seeking immediate medical attention for inhalation incidents.

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B2B Procurement Guide

When procuring Anhydrous Aluminum Chloride industrially, prioritize suppliers with ISO certification and material safety data sheets (MSDS). Key specifications include purity (≥98%), low iron content (<0.01%), and moisture-free packaging (typically 25kg steel drums or 1-ton bulk bags). Quality verification through third-party testing is advisable. Consider regional logistics—transportation may require hazardous material certification. For large contracts, negotiate bulk discounts while ensuring the supplier can maintain consistent quality across batches. Spot prices fluctuate with aluminum market trends and energy costs.

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