Organic peroxides are liquid or solid organic compounds with a divalent -O-O-structure in the chemical structure, including mixtures of organic peroxides. Organic peroxide chemical activity is high, sensitive to heat, can occur spontaneously from the accelerated decomposition, is a very important class of dangerous chemicals, which generally have one or more of the following properties:
In the United Nations GHS system and GB 30000.16-2013 according to the degree of danger, the organic peroxide is divided into seven sub-categories, namely, A-type organic peroxide to G-type organic peroxide, Organic Peroxides the degree of risk from A to G Gradually diminishing. However, in the catalog (2015 edition) only the organic peroxide was adopted in the A-type to the F-type, a total of six sub-categories, did not adopt the G-type.
The classification of peroxide is divided into two steps. In general, any organic peroxide should be considered for this category. For the mixture, it is judged whether it is organic peroxidation based on the available oxygen and hydrogen peroxide content. thing;
Organic peroxide transport requirements
In the United Nations TDG Regulations, organic peroxides are classified as hazardous substances in Article 5.2. Considering its unique hazard properties, certain organic peroxides must control the temperature during transport, and some organic peroxides need to be filled by adding a diluent or by using an inert solid to reduce their reactivity.
At the same time, should avoid eye contact with organic peroxide. Some organic peroxides, Organic Peroxides even in short contact, can cause serious injury to the cornea or corrosive to the skin.
At present, organic peroxides that are allowed to be transported by container have been listed in the list of organic peroxides in TDG (see Annex). For each substance that is allowed to be transported, the generic items (UN numbers 3101 to 3120) are delineated in the list and provide corresponding secondary hazards and notes on the transport information.
According to statistics, in addition to the first 2828 entries in the directory, organic peroxides (including their preparations or mixtures) a total of 240 species, of which D-type organic peroxides accounted for the vast majority, reaching 103 species.
Organic peroxides are an organic substance containing a bivalent -O-O-structure, or a derivative of hydrogen peroxide. Such as formic acid (HCOOOH), peracetic acid (CH3COOOH) and the like. Organic peroxides are substances with poor thermal stability and can undergo an accelerated decomposition of exothermic processes:
Decomposition of explosive. Since organic peroxides contain extremely unstable peroxy-O-O-, Organic Peroxides they are extremely sensitive to heat, vibration, shock and friction, so they are decomposed when subjected to slight external forces. Such as diacetyl peroxide, pure product produced after 24 hours may be a strong explosion; dibenzoyl peroxide water below 1%, a slight friction that can cause an explosion; diisopropyl peroxydicarbonate Above 10 ℃ when the instability, to 17.22 ℃ when the decomposition of the explosion; peracetic acid (peracetic acid) pure very unstable, at minus 20 ℃ when the explosion, the concentration of more than 45% of the solution, the storage process is still Can be decomposed from oxygen, heated to 110 ℃ when the explosion. Organic Peroxides It is not difficult to see that organic peroxides are very sensitive to temperature and external forces, and are more dangerous and hazardous than other oxidants.