According to the method, coal tar is taken as a raw material; naphthalene is fractionated through a weight-removing column; firstly crude naphthalene is obtained; and then industrial naphthalene is prepared through a crude naphthalene rectifying column.
Is naphthalene obtained from coal tar?
Naphthalene is an aromatic compound that is widely used for the production of phthalic anhydride, superplasticizers, and intermediate products such as Cleve’s acids in dye production. … Purified naphthalene may be derived not only from coal tar but from petroleum tar.
What are the compounds obtained from coal tar?
The six major classes of compounds of coal-tar creosote include: aromatic hydrocarbons, tar acids/phenolics, tar bases/nitrogen-containing heterocycles, aromatic amines, sulfur-containing heterocycles, and oxygen-containing heterocycles (Table 8.1).
What is the common use for naphthalene?
Naphthalene is used in the manufacture of plastics, resins, fuels, and dyes. It is also used as a fumigant insecticide that works by turning directly from a solid into a toxic vapor. This process is called sublimation.
How is naphthalene produced?
Naphthalene may be produced from either coal tar or petroleum. Distillation and fractionation of coal tar is the most common production process. … The naphthalene is then recovered by fractionation, decolorized, and purified by crystallization. Naphthalene produced from petroleum is about 99% pure.
How poisonous are moth balls?
Some of the chemicals in mothballs can cause reversible health effects that include headaches, nausea, eye and nose irritation and coughing. Exposure to naphthalene can cause more serious effects, including hemolytic anemia. Naphthalene is also a possible carcinogen.
What causes white tar every year?
Definition of naphthalene:
Naphthalene (also called white tar and tar camphor) is a white solid that evaporates easily. Its present in fuels such as petroleum and coal and has been used in mothballs and moth flakes. Burning tobacco or wood produces naphthalene.
Is coke obtained from coal tar?
Coal tar: It is obtained as a by-product in the process of making coke. Though its colour is the same as coke, tar is a highly viscous liquid.
Is coal tar an antifungal?
Coal tar is used in medicated shampoo, soap and ointment. It demonstrates antifungal, anti-inflammatory, anti-itch, and antiparasitic properties. It may be applied topically as a treatment for dandruff and psoriasis, and to kill and repel head lice.
Is coal tar bad for your skin?
Tar can stay on your skin for 24 hours or longer, and your chances of sun damage go up during that time. If you have blond or other light-colored hair, shampoo with coal tar could make it darker. Treatments with coal tar also can stain clothes or skin. Some people don’t like the way coal tar shampoos smell.
Is naphthalene toxic to humans?
Acute (short- term) exposure of humans to naphthalene by inhalation, ingestion, and dermal contact is associated with hemolytic anemia, damage to the liver, and neurological damage.
Is smelling naphthalene balls harmful?
Moth balls contain a toxic chemical, either naphthalene or paradichlorobenzene. Both become a gas when exposed to air and cause that pungent moth ball smell. These gases are irritating to the eyes and lungs and may cause headache, dizziness and nausea. They are both suspected of causing cancer.
Is naphthalene poisonous to humans?
Inhalation of naphthalene may cause skin and eye irritation; gastrointestinal symptoms, such as nausea, vomiting, abdominal cramps, and diarrhea; neurologic symptoms, such as confusion, excitement, and convulsions; renal problems, such as acute renal shutdown; and hematologic features, such as icterus and severe anemia …
What happens if we eat naphthalene balls?
If swallowed, naphthalene can damage red blood cells, causing kidney damage and many other problems. It can affect how blood carries oxygen to the heart, brain, and other organs. It can also cause nausea, vomiting, abdominal pain, seizures and coma.
Is it safe to use naphthalene balls in kitchen?
But, in spite of its many uses, the fumes from naphthalene balls are quite harmful. The chemical is not only poisonous but also carcinogenic (cancer-causing). It poses several other health hazards as well ranging from nausea and headache to damaged blood cells.
What animal smells like mothballs?
Some types of moth eat clothing and fibers. The smell of mothballs is known to keep moths from invading homes and consuming stored items such as clothing and bedding. Mothballs have also been rumored to keep snakes, mice and other pests away.