Production. Most naphthalene is derived from coal tar. From the 1960s until the 1990s, significant amounts of naphthalene were also produced from heavy petroleum fractions during petroleum refining, but today petroleum-derived naphthalene represents only a minor component of naphthalene production.
Which one is 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.
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How is naphthalene isolated from coal tar?
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.
Which product obtained from coal tar is used as moth repellent?
Which is used for making naphthalene balls?
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.
Why is naphthalene balls preferred in cupboards to deter insects?
Answer Expert Verified. Naphthalene is a substance that is sublime in nature; this basically means it has a tendency to change its state from solid directly to the gaseous form without paying through the intermediate liquid state. Naphthalene balls are kept in clothes to protect them from insects.
Where are naphthalene balls obtained from?
Most naphthalene is derived from coal tar. From the 1960s until the 1990s, significant amounts of naphthalene were also produced from heavy petroleum fractions during petroleum refining, but today petroleum-derived naphthalene represents only a minor component of naphthalene production.
Which of the following is obtained from coal tar petrol coke air?
Explanation: Naphthalene balls used to repel moth and other insects are also obtained from coal tar. Note: These days bitumen a petroleum product is used in place of coal tar for metalling the roads. (3) Coal Gas: Coal gas is mainly a mixture of hydrogen, methane and carbon monoxide.