National standard number: 4 15 1 1

Naphthalene nài is an organic compound, the simplest condensed aromatic hydrocarbon, with the molecular formula of C 10H8, which is formed by fusing two benzene rings of two adjacent carbon atoms. Colorless, toxic and easily sublimated flaky crystals with special odor. It is a by-product of coking and is mainly used to synthesize phthalic anhydride.

Performance and stability:

1. Oxidized with chromium oxide in acetic acid solution to produce α-naphthoquinone. Hydrogenation produces tetralin and further hydrogenation produces decalin. Under the catalysis of ferric chloride, chlorine gas was introduced into benzene solution of naphthalene to obtain α-chloronaphthalene. Tetrachloronaphthalene reacts with chlorine under light.

Nitration of naphthalene is easier than benzene and can be carried out at room temperature. The main product is α-nitronaphthalene. The sulfonation products of naphthalene are related to temperature. α-Naphthalenesulfonic acid was mainly obtained at low temperature, and β-Naphthalenesulfonic acid was mainly obtained at high temperature.

2. Naphthalene has little water solubility and is not easily absorbed, so its toxicity is not too strong. Inhalation of concentrated naphthalene vapor or naphthalene powder can cause vomiting, discomfort and headache.

Production equipment and containers should be sealed to prevent steam powder from escaping, and the operation site should be forced to ventilate. In case of poisoning, immediately move to fresh air, drink more hot water, make it vomit, carry out artificial respiration, and send it to hospital for treatment in severe cases.

3. stability: stability.

4. Prohibited compounds: strong oxidants (such as chromic anhydride, chlorate and potassium permanganate).