Acetaldehyde, ammonia reaction polymerization

One half of an aqueous solution of vinylpyrrolidone (VP) is added to the reactor while the other half is added in portions during the polymerization. The polymerization is initiated when hydrogen peroxide and ammonia are added to the reaction mixture. The ammonia serves as a buffer in the solution in order to provide an alkaline condition, thus preventing the splitting off of the acetaldehyde from the monomer during the reaction. The rate of the peroxide-initiated polymerization is expressed as ... 

ACIDE CYANHYDRIQUE (French) (74-90-8) Can be self-reactive, forming an explosive mixture with air (flash point 0°F/— 18°C). Unless inhibited, material stored more than 90 days may be hazardous. Heat above 356°F/180°C or contact with alkalis or amines can cause explosive polymerization. Violent reaction with strong oxidizers, acetaldehyde. Solutions containing more than 2—5% water are less stable than dry material. Acid solutions react with ammonia, ferric oxide, halogens, ozone. Attacks some plastics, rubber, and coatings. Water solutions attack carbon steels at room temperatures and stainless steels (especially if stabilized with sulfuric acid) above 176°F780°C. 

ISOCIANATO de METILO (Spanish) (624-83-9) Forms explosive mixture with air (flash point 0°F/- 18°C). Reacts slowly with water violently with warm water or steam, forming carbon dioxide and heat. Decomposes above 100°F/38 C. Violent reaction with acetaldehyde, amines, alcohols, acids, alkalis, strong oxidizers. Unless inhibited, can produce unstable peroxides contact with iron, tin, copper, or salts of these elements, or with certain catalysts such as triphenylarsenic oxide, triethylphosphine, or tributyltin oxide, or elevated temperatures may cause polymerization. Incompatible with glycols, amides, ammonia, caprolactam. Attacks some plastics, rubber, or coatings. The uninhibited monomer vapor may block vents and confined spaces by forming a solid polymer material. 

EXPLOSION and FIRE CONCERNS flammable NFPA rating Health 4, Flammability 4, Reactivity 2 bums in air with a blue flame very dangerous fire hazard may polymerize explosively at 122-140°F or in the presence of traces of alkali severe explosion hazard when subjected to chemical reaction with oxidizers gas forms explosive mixtures with air reacts violently with acetaldehyde flashback along vapor trail may occur vapor may explode if ignited in confined area closed containers may rupture violently when heated reaction with water, steam, acid, or acid fumes emits toxic fumes of CN incompatible with amines, strong oxidizers, acids, sodium hydroxide, calcium hydroxide, sodium carbonate, water, caustics, and ammonia use water spray, dry chemical, alcohol foam, or carbon dioxide for firefighting purposes. 

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