Sulfuryl fluoride fumigant is an inorganic compound with the chemical formula SO2F2. It is a colorless, odorless, and toxic gas under normal temperature and pressure. Slightly soluble in water, soluble in ethanol, benzene, and carbon tetrachloride. Chemically inert, does not decompose at high temperature, is still stable at 400 ° C, and is not very reactive. Slowly hydrolyze in caustic alkali aqueous solution, and act rapidly in potassium hydroxide ethanol solution to obtain sulfuric acid and potassium fluoride. Ammonolysis in sulfamide. It is obtained by burning fluorine in the sulfur dioxide or by thermal decomposition of barium fluorosulfonate.
History of sulfuryl fluoride fumigant
Sulfuryl fluoride fumigant started laboratory tests and applied research in China in the 1970s by the Plant Quarantine Institute of the Ministry of Agriculture, Animal Husbandry and Fisheries, the Labor Hygiene Institute of the Chinese Academy of Medical Sciences, and Beijing 621 Factory. In 1977, it was assigned to the Zhejiang Institute of Chemical Industry by the Ministry of Chemical Industry under the key scientific research project "Sulfuryl fluoride fumigant research". In 1983, it passed the ministerial technical appraisal and was put into production in China.
Application of sulfuryl fluoride fumigant
Sulfuryl fluoride fumigant has the characteristics of a broad insecticidal spectrum, strong diffusion permeability, low toxicity, less residue, wide operating temperature range, non-flammable, non-explosive, and non-corrosive. It can be widely used in warehouses, ships, carriages, containers, and other goods to kill insects and rodents. Termite control in buildings, reservoirs, and dams. Greenhouse soil fumigation and disinfection. It is the most ideal fumigant at home and abroad for use in logistics removal, entry-exit health quarantine, and plant quarantine, as well as in agriculture, forestry, commercial trade, traffic hygiene, water conservancy, construction, and other related industries. It is also a green and environmentally friendly fumigant that replaces methyl bromide (methyl bromide) and does not destroy the ozone layer of the atmosphere. At present, the most commonly used fumigants in China are aluminum phosphide and methyl bromide. Aluminum phosphide has been widely used in warehouses such as grain storage and tobacco for a long time due to its convenient operation and low price. However, the phosphine gas released by aluminum phosphide during the fumigation process is highly toxic, flammable, and explosive, and there are many potential safety hazards. At the same time, its corrosiveness has an impact on the material of the fumigated material. For example: in piano fumigation, while effectively killing the wood-boring pests in the piano, the metal material inside the piano is also corroded to varying degrees, and the corrosion consequences will be latent and gradually revealed. Methyl bromide was originally a good fumigant, but due to its destruction of the atmospheric ozone layer, the international "Montreal Protocol" has listed it as a phase-out product. Because of this, the promotion and application of sulfuryl fluoride fumigant in various fields have gradually become an inevitable global trend.
Hazards of sulfuryl fluoride fumigant
Reacts with water or water vapor and emits toxic corrosive gas. In case of high heat, the internal pressure of the container will increase, and there is a danger of cracking and explosion. It has a strong irritating effect on the eyes, skin, and mucous membranes. Can cause nausea, vomiting, abdominal pain, itchy skin, and other symptoms. TLV-TWA: 20mg/m3≈4.79PPM. The acute toxicity of this product mainly damages the central nervous system and causes convulsions.