Segregate oxidizers from all other chemicals in the laboratory. Minimize the quantities of strong oxidizers stored in the laboratory. DO NOT return excess chemicals to the original container. Impurities may be introduced into the container which may cause a fire, explosion or other unwanted event or contamination. Anticipate emergency situations, have proper handling equipment in the lab and readily available for spills.
Check the MSDS to determine what is appropriate. Spill control materials for oxidizers are designed to be inert and will not react with the reagent i. In the event of a spill or adverse reaction notify lab personnel immediately that an incident has occurred.
Turn off all ignition sources if this can be done safely; vacate the area and call for assistance. Laboratory emergencies should be reported to the public safety office at Public safety will also contact the Office of Environmental Health and Safety at Skin Contact: Remove contaminated clothing and rinse the affected skin immediately with copious amounts of water for 15 minutes or until pain is relieved.
Seek medical attention if the skin is irritated or pain is felt or if the chemical is highly toxic. Eye Contact: Use the eye wash to rinse the eye thoroughly for at least 15 minutes, occasionally lifting upper and lower eyelids and rolling the eyeballs.
Seek medical attention. Ingestion: Do not induce vomiting. Rinse the mouth with water. Always consult with the SDS for emergency procedures specific to the chemical you are using. Spills: Sweep up spills of solid oxidizers carefully with a broom and dustpan.
Collect the material in a container with lid. Liquid spills can be cleaned up with inert absorbent pads no organic material. If the liquid oxidizer is an acid, the spill should first be neutralized with sodium bicarbonate. Separate oxidizers from organic chemicals, reducing agents, and combustible materials by using secondary containment or storing them on different shelves. Store them away from heat sources. Keep waste streams containing oxidizers separate from organic waste and waste containing reducing agents.
Accidental mixing of oxidizers and organics in closed waste containers has caused several accidents in recent history. Be extremely careful when labeling and filling waste containers. Toggle navigation Menu. Incidents Emergencies. Emergency Response Incident Reporting and Investigation. Preparedness and Spill Procedures. The search results will also allow you to link to a description of the databases and view sample records.
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OSH Answers Fact Sheets Easy-to-read, question-and-answer fact sheets covering a wide range of workplace health and safety topics, from hazards to diseases to ergonomics to workplace promotion. Search all fact sheets: Search. Type a word, a phrase, or ask a question. Common oxidizing liquids and solids include: bromine bromates chlorinated isocyanurates chlorates chromates dichromates hydroperoxides hypochlorites inorganic peroxides ketone peroxides nitrates nitric acid nitrites perborates perchlorates perchloric acid periodates permanganates peroxides peroxyacids persulphates There are other chemicals that are oxidizing materials.
Oxidizing materials can: speed up the development of a fire and make it more intense. Class 1 Oxidizers: slightly increase the burning rate of combustible materials. Class 2 Oxidizers: increase the burning rate of combustible materials moderately with which they come in contact. Class 3 Oxidizers: severely increase the burning rate of combustible materials with which they come in contact. Class 4 Oxidizers: can explode when in contact with certain contaminants.
Although most oxidizing materials do not burn themselves, they can produce very flammable or explosive mixtures when combined with combustible materials like: organic carbon-containing materials such as paper, wood, flammable and combustible liquids, greases, waxes, many plastics and textiles finely divided metals other oxidizable substances such as hydrazine, hydrogen, hydrides, sulphur or sulphur compounds, phosphorous, silicon and ammonia or ammonia compounds Some oxidizing materials are also incompatible with non-combustible materials.
They differ in the method of heat utilization and heat recovery. Other types exist such as flameless thermal oxidizers and enclosed vapor combustion units. This results in less auxiliary fuel consumption and less heat released into the atmosphere. The heat exchangers can be either plate or shell-and-tube heat exchangers. Thermal oxidizers with plate heat exchangers require lower investment and have higher thermal efficiency at lower operating temperatures.
At higher operating temperatures, shell-and-tube heat exchangers are preferred. Catalyst oxidizers operate in the same way as thermal oxidizers, but with the addition of a catalyst bed.
The catalyst further enhances the oxidation of VOCs by increasing the reaction rate. This catalytic process increases the removal efficiency of the oxidizer and allows the combustion chamber to operate at lower temperatures. The downside of this process is the additional maintenance and replacement of the catalyst media due to the effects of degradation and sintering. In addition, some catalysts are deactivated in the presence of certain compounds or catalyst poisons such as sulfides and halides.
In a catalytic oxidizer, the stream of air and waste gas is drawn and preheated either through regenerative or recuperative methods. Similar to thermal oxidizers, catalytic oxidizers that use regenerative methods alternating ceramic beds of heat recovery are called regenerative catalytic oxidizers while those that use recuperative methods heat exchangers are called recuperative catalytic oxidizers.
The preheated stream is then ignited and burned in the combustion chamber. The main destruction of VOCs happens when it comes into contact with the catalyst. As the stream passes through the catalyst bed, the VOCs are adsorbed on the catalyst.
The surface of the catalyst has active sites where atoms such as oxygen and hydrogen have high affinity. While on the active site, it is easier for the VOC compound to lose the bonds between its atoms which are attracted to the active sites of the catalyst. New and more stable bonds form creating the products of the reaction.
The formation of these products releases it from its attachment to the catalyst freeing up the active site. This results in lesser heat required to facilitate oxidation, and in turn, better destruction efficiency. The type of catalyst used largely depends on the types of VOCs and contaminants present in the waste gas stream.
A catalyst can be selective in which it facilitates a reaction well for certain compounds while being weak for others. That is why in some systems, catalysts are combined to create a synergistic effect to improve the overall performance of the oxidizer. Catalysts can be classified as metal oxides or noble metals. Catalyst systems can also be categorized according to their method of contacting the gas stream. The catalyst must have a shape and distribution that is able to maximize the contact of the active sites to the VOCs in the stream, especially if the VOC concentration is small and the gas mixture flow rate is high.
The methods of enabling catalyst contact are enumerated below. An air scrubber is an air purification system that removes particulate matter from the air through the use of moisture or by cooling or filtering the airstream as it enters the scrubber The term "air pollution" is used so frequently that many of us believe we have a complete understanding of its meaning. Scientists and environmentalists have made so many predictions of the negative effects Air filters are devices used to remove airborne particles, pollutants, and microorganisms hazardous to health and the ecosystem.
In industrial facilities, air filters preserve the quality of products and materials and protect critical equipment from damage A baghouse is a pollution control device that uses tubes, envelopes, or cartridges to remove, capture, and separate dirt, particulate matter, and dust from the air of a manufacturing or processing facility.
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