Hydroxylamine[2]

Updated: 2026-09-15

Overview

Hydroxylamine (NH2OH) is a reactive nitrogen compound that exists as a colorless solid or aqueous solution. It is industrially produced by the Raschig process or via catalytic hydrogenation of nitric oxide. Due to its dual functional groups (−NH2 and −OH), it serves as a versatile intermediate in organic and inorganic synthesis. Primarily handled as hydroxylamine hydrochloride or sulfate salts for stability, it is a key precursor in pharmaceuticals, agrochemicals, and specialty chemicals. Its reducing properties make it valuable in photographic development and as an oxygen scavenger in water treatment.

Physical and Chemical Properties

Hydroxylamine is hygroscopic and typically stored as a 50% aqueous solution to mitigate decomposition risks. It decomposes exothermically above 70°C, releasing toxic gases like nitrogen oxides. The compound exhibits weak basicity (pKb ~8) and forms salts with acids, such as hydroxylamine hydrochloride (NH2OH·HCl). Its reducing capability is exploited in the synthesis of oximes from ketones/aldehydes, a reaction pivotal in caprolactam production for nylon-6. In alkaline conditions, hydroxylamine reduces metal ions (e.g., silver, copper) and reacts violently with strong oxidizers, necessitating careful handling.

Main Applications

In pharmaceuticals, hydroxylamine derivatives are used to produce antibiotics (e.g., oxazolidinones) and antivirals. The photography industry employs it as a silver halide reducing agent in developers. It also acts as a chain terminator in polymer production and a corrosion inhibitor in boiler water treatment. Agriculturally, hydroxylamine sulfate serves as a growth regulator. Its oxime derivatives are intermediates for pesticides like aldicarb. Emerging applications include semiconductor cleaning and nanoparticle synthesis, where its reducing properties aid in metal oxide removal.

Safety and Storage

Hydroxylamine is classified as toxic (GHS06) and corrosive (GHS05). Inhalation or skin contact can cause severe irritation, while ingestion may lead to methemoglobinemia. Solutions above 30% concentration are explosion hazards; dilute to <10% for safer handling. Store in polyethylene or glass containers away from heat and incompatible materials (e.g., acids, metals). Use non-sparking tools and grounding to prevent static discharge. Always consult SDS and wear PPE (gloves, goggles, respirators) during handling. Spills should be neutralized with dilute acetic acid and absorbed with inert materials.

B2B Procurement Guide

Industrial buyers should prioritize suppliers offering certified purity (≥99% for synthesis grades) and stable salt forms (hydrochloride/sulfate). Bulk solutions (50%) are cost-effective but require temperature-controlled transport. Verify analytical certificates (HPLC, titration) and impurity profiles (e.g., iron content <10 ppm). Consider regional logistics: EU/NA markets favor hydroxylamine sulfate due to regulatory preferences, while Asia-Pacific often uses hydrochloride. Negotiate contracts with flexible delivery terms, as demand fluctuates with caprolactam and pharmaceutical cycles. Audit suppliers for ISO 9001/14001 compliance and emergency response capabilities.