Greta Jimenez
Cyclohexane is a highly volatile organic compound that is produced industrially from the hydrogenation of benzene. It is one of the most widely used non-polar solvents globally and is an intermediate in the production of nylon-6,6. Cyclohexane emissions are a concern due to their potential impact on human health and the environment. Breathing large amounts of cyclohexane can adversely affect the human nervous system, causing headaches, anaesthesia, tremors, and convulsions. Given the potential hazards associated with cyclohexane exposure, it is crucial to understand whether it is classified as a hazardous air pollutant and what regulatory actions are in place to mitigate its impact on human health and the environment.
| Characteristics | Values |
|---|---|
| Workplace exposure standard | Maximum 8-hour time-weighted average (TWA): 100 parts per million (350 mg/m3) |
| Maximum short-term exposure limit (STEL): 300 parts per million (1050 mg/m3) | |
| Effects on human health | Adversely affects the human nervous system, causing headaches, anaesthesia, tremors, and convulsions |
| Can cause headache, nausea, dizziness, narcosis and even death at high levels of exposure | |
| Acute extreme exposure can cause nausea, vomiting, incoordination, and coma | |
| Chronic exposure to the skin can cause dry, scaly, and fissured dermatitis | |
| Toxicity | Cyclohexane is a highly volatile organic compound |
| Cyclohexane is a hazardous air pollutant | |
| Removal from ambient air | Dielectric barrier discharge (DBD) reactor |
| 3-phase gliding arc plasma reactor |
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What You'll Learn
Cyclohexane is a toxic pollutant
As an airborne toxic pollutant, cyclohexane can have detrimental effects on human health when inhaled. Short-term exposure to high concentrations of cyclohexane can cause adverse effects on the human nervous system, ranging from headaches to more severe symptoms such as anaesthesia, tremors, and convulsions. Long-term exposure to lower concentrations of cyclohexane, on the other hand, may result in unknown chronic health impacts, as studies have not yet determined the specific effects of prolonged exposure to smaller amounts. However, it is important to note that the severity of health effects depends on the concentration of cyclohexane, the duration of exposure, and the overall health of the exposed individual.
The sources of cyclohexane emissions are diverse and contribute to its presence in the environment. Industrially, cyclohexane is produced through the hydrogenation of benzene, and it is a crucial intermediate in the production of nylon-6,6. Additionally, it finds wide application as a non-polar solvent and is used in the synthesis of adipic acid and caprolactam. Spills from petroleum products, solvent usage, and the rubber industry are also significant contributors to cyclohexane emissions. The release of cyclohexane into the atmosphere during these processes leads to its presence in ambient air, posing risks to both human populations and the environment.
Regulating cyclohexane emissions is essential to mitigate its toxic effects. Safe Work Australia has set workplace exposure standards for airborne contaminants, including cyclohexane, to protect workers from potential health hazards. Additionally, the US Environmental Protection Agency (EPA) has taken steps to address exposures to toxic chemicals, including cyclohexane, under the Clean Air Act. These regulations aim to control outdoor air emissions, limit workplace exposures, and enforce disclosure requirements for environmental releases. However, despite these efforts, the complex nature of chemical hazards and the lack of comprehensive regulations leave gaps in adequately addressing the risks associated with cyclohexane and other toxic pollutants.
In summary, cyclohexane is a toxic pollutant that poses a threat to human health and the environment due to its widespread use and high volatility. Its presence in ambient air has driven the development of advanced removal techniques. The toxic effects of cyclohexane on human health, particularly the nervous system, underscore the importance of stringent regulations and exposure limits. With ongoing research and improved regulatory measures, the risks associated with cyclohexane as a hazardous air pollutant can be better managed to protect public health and the environment.
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Cyclohexane is a highly volatile organic compound
As a VOC, cyclohexane can have harmful effects on both human health and the environment. Breathing large amounts of cyclohexane for short periods of time can adversely affect the human nervous system, causing headaches, anaesthesia, tremors, and convulsions. Contact with the liquid or vapour can also damage the eyes. These effects are typically not observed at levels of cyclohexane normally found in the environment. However, the long-term health effects of exposure to smaller amounts of cyclohexane over extended periods are not yet fully understood.
The removal of cyclohexane from ambient air is an important area of research. Studies have explored the use of non-thermal plasmas (NTPs), specifically dielectric barrier discharge (DBD) reactors, to effectively remove cyclohexane and other toxic compounds from the air. The removal efficiency of cyclohexane has been shown to increase with higher specific input energy and residence time, while decreasing with higher concentrations at constant input energy and residence time.
Additionally, the inclusion of dry and humidified air carrier gases in the DBD reactor allows for the investigation of the role of H2O-derived radicals in the decomposition process. This can aid in the development of mechanisms for the treatment of actual waste gas containing VOCs, as these gases are typically present in the air at most pollution sources. Overall, the use of NTPs and DBD reactors shows promise for the abatement of VOC emissions and the reduction of cyclohexane pollution in the atmosphere.
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Cyclohexane is widely used in industry
Cyclohexane is a hazardous air pollutant. It is a highly volatile organic compound and is produced industrially from the hydrogenation of benzene. Cyclohexane is widely used in industry, despite its hazardous nature. It is one of the most commonly used non-polar solvents globally and is an intermediate in the production of nylon-6,6.
The global use of cyclohexane is dominated by the synthesis of adipic acid, which accounts for about 55% of its applications. The oxidation of cyclohexane results in this synthesis, which also leads to an increase in cyclohexane emissions into the air. The remaining applications of cyclohexane are in the production of caprolactam, which is used in the synthesis of pharmaceuticals, dyes, herbicides, pesticides, plasticizers, and rubber chemicals.
Cyclohexane is also used in the synthesis of adhesives, automotive parts, cleaning and furnishing care products, coating additives, electronics, fuel, laboratory chemicals, paint, and photo chemicals. Its versatility as a solvent is due to its ability to mix well with most other organic solvents.
In addition to the intentional uses of cyclohexane, it is also emitted into the environment through spills from petroleum products, solvent usage, and the rubber industry. The effects of cyclohexane exposure on human health depend on the concentration, length, and frequency of exposure. High exposure over short periods can adversely affect the nervous system, causing headaches, anaesthesia, tremors, and convulsions.
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Cyclohexane is a non-persistent pollutant
Cyclohexane is a toxic pollutant that is harmful to both the environment and human health. It is a highly volatile organic compound and one of the most common cycloalkanes. Classified as a toxic air pollutant, cyclohexane is produced industrially from the hydrogenation of benzene and is used as a non-polar solvent for lacquers, resins, fats, oils, and waxes. It is also used in paint and varnish removers and in solid fuels.
While cyclohexane is a hazardous substance, it is considered a non-persistent pollutant. This means that it does not remain in the environment for extended periods. Specifically, cyclohexane is non-persistent in water, with a half-life of less than 2 days. The half-life of a pollutant refers to the amount of time it takes for half of the chemical to degrade. In the case of cyclohexane, it will eventually end up in the air, with virtually 100% of it being released into the atmosphere.
The effects of cyclohexane exposure depend on the amount present and the length and frequency of exposure. Inhalation of large amounts of cyclohexane over short periods can adversely affect the human nervous system, causing headaches, anaesthesia, tremors, and convulsions. Direct contact with the liquid or vapour can also damage the eyes. However, these effects are not likely to occur at the levels of cyclohexane typically found in the environment.
The removal of cyclohexane from ambient air is a critical area of research. Studies have investigated the use of non-thermal plasmas (NTPs) and dielectric barrier discharge (DBD) reactors to eliminate cyclohexane from the air. These techniques aim to increase the removal efficiency of cyclohexane by adjusting parameters such as specific input energy, carrier gases, residence time, and concentration.
Overall, while cyclohexane is a hazardous air pollutant, it is considered non-persistent due to its relatively short half-life and the potential for removal through various techniques.
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Cyclohexane is a hazardous air pollutant
The effects of cyclohexane exposure on human health and the environment depend on several factors, including the concentration, length, and frequency of exposure. High exposure to cyclohexane can cause adverse effects on the human nervous system, ranging from headaches to anaesthesia, tremors, and convulsions. It can also cause damage to the eyes. These effects are typically not observed at levels of cyclohexane normally found in the environment. However, the long-term health effects of exposure to smaller amounts of cyclohexane over extended periods are not yet fully understood.
Due to its hazardous nature, the removal of cyclohexane from ambient air has been the subject of several studies. One study investigated the use of a dielectric barrier discharge (DBD) reactor for the removal of cyclohexane from air using a non-thermal plasma technique. The DBD reactor was tested in environments of nitrogen, dry air, and humidified air at ambient conditions. The results showed that the removal efficiency of cyclohexane increased with higher specific input energy and residence time.
Another study by Młotek et al. examined the removal of cyclohexane using a 3-phase gliding arc plasma reactor. This research evaluated the impact of plasma power, inlet concentration, and gas flow rates on the removal efficiency. The findings indicated that removal efficiency improved with increased power at constant concentration and longer residence time, allowing more contact time between cyclohexane molecules and highly energetic electrons.
To regulate cyclohexane emissions, Safe Work Australia has set workplace exposure standards for airborne contaminants. These standards specify a maximum eight-hour time-weighted average (TWA) of 100 parts per million (350 mg/m3) and a maximum short-term exposure limit (STEL) of 300 parts per million (1050 mg/m3). These standards aim to protect workers from the potential health risks associated with cyclohexane exposure.
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Frequently asked questions
Yes, cyclohexane is a highly volatile organic compound and is classified as a toxic pollutant. It is produced industrially from the hydrogenation of benzene.
Breathing large amounts of cyclohexane for short periods of time can adversely affect the human nervous system, ranging from headaches to anaesthesia, tremors, and convulsions. Contact with cyclohexane liquid or vapour can also damage the eyes.
Cyclohexane can be removed from ambient air using a non-thermal plasma technique in a dielectric barrier discharge (DBD) reactor. The removal efficiency of cyclohexane increases with increasing specific input energy and residence time.
