Hydrogen chloride

Hydrogen chloride is a highly corrosive inorganic compound with the chemical formula HCl and CAS number 7647-01-0. This colorless gas has a molecular weight of 36.46 g/mol and is classified as a dangerous substance with corrosive properties (Skin Corr. 1B) and specific target organ toxicity (STOT SE 3). It readily dissolves in water to form hydrochloric acid and is characterized by its pungent, irritating odor that can be detected at very low concentrations.

Hydrogen chloride is a colorless gas at room temperature with an extremely pungent and suffocating odor. It has a boiling point of -85°C and is highly soluble in water, forming hydrochloric acid upon dissolution. The compound is heavier than air with a density of approximately 1.27 kg/m³ at standard conditions. It is non-flammable but highly reactive, particularly with metals and basic substances, producing hydrogen gas and corresponding chlorides.

Hydrogen chloride is primarily used in the production of hydrochloric acid, one of the most important industrial chemicals. It serves as a key intermediate in manufacturing PVC plastics, pharmaceuticals, and various organic compounds through hydrochlorination reactions. The compound is also utilized in metal processing for pickling and cleaning operations, in the production of chlorides, and as a catalyst in chemical synthesis. Additionally, it plays a role in semiconductor manufacturing and water treatment applications.

Hydrogen chloride requires strict safety measures due to its corrosive nature and toxicity. Personnel must wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and respiratory protection in well-ventilated areas. Work should be conducted in fume hoods or with adequate ventilation systems to prevent inhalation. Emergency shower and eyewash stations must be readily accessible. All equipment should be made of compatible materials, and proper training on emergency procedures is essential before handling.

Hydrogen chloride must be stored in cool, dry, well-ventilated areas away from incompatible materials such as alkalis, metals, and oxidizing agents. Containers should be made of suitable materials like polyethylene or PTFE, and storage areas must be equipped with appropriate ventilation systems. The compound should be kept away from heat sources and moisture, as it readily absorbs water from air. Storage facilities must comply with local regulations and include emergency response equipment and spill containment measures.

Hydrogen chloride exposure requires immediate emergency response due to its corrosive properties. For skin contact, immediately remove contaminated clothing and flush the affected area with copious amounts of water for at least 15 minutes. In case of eye contact, rinse thoroughly with water and seek immediate medical attention. If inhaled, move the person to fresh air and provide oxygen if breathing is difficult. For ingestion, do not induce vomiting and seek immediate medical care. Always consult poison control centers promptly.

Hydrogen chloride disposal must comply with local environmental regulations and waste management protocols. The compound cannot be disposed of in regular waste streams due to its hazardous classification. Proper neutralization with appropriate alkaline solutions under controlled conditions may be required before disposal. Licensed waste management companies specializing in hazardous chemical disposal should handle the process. All disposal activities must be documented and reported according to regulatory requirements, ensuring environmental protection and legal compliance.

Hydrogen chloride is classified under ADR Class 8 (corrosive substances) with Packing Group II, indicating significant transport hazards. Transportation requires specialized containers meeting UN packaging standards and proper hazard labeling with GHS05 and GHS07 pictograms. Vehicles must carry appropriate emergency equipment and documentation including safety data sheets. Drivers need specialized training for dangerous goods transport, and routes should avoid populated areas when possible. Emergency response procedures must be readily available during transport.

Hydrogen chloride is subject to comprehensive European regulations including REACH registration requirements and CLP classification as a corrosive substance with danger signal word. It is not listed as a Substance of Very High Concern (SVHC), but strict workplace exposure limits apply under occupational health directives. The compound requires safety data sheets, proper labeling with GHS pictograms (GHS05, GHS07), and compliance with industrial emissions regulations. Users must implement appropriate risk management measures and report usage according to regulatory requirements.

Hydrogen chloride is available through OYSI, a specialized European distributor of technical chemicals serving industrial customers across the continent. OYSI provides high-quality hydrogen chloride with complete regulatory documentation, safety data sheets, and technical support for industrial applications. As a professional chemical distributor, OYSI ensures compliance with European regulations and offers reliable supply chain solutions for businesses requiring this corrosive compound for their manufacturing processes and chemical operations.