Question

write a synthesis of phenol by DOW'S process and CUMENE process...​

Answer 1

Answer:

Dow's Process may also refer to the hydrolysis of chlorobenzene in the preparation of phenol. It is treated with aqueous sodium hydroxide at 350 °C and 300 bar or molten sodium hydroxide at 350 °C to convert it to sodium phenoxide, which yields phenol upon acidification.

Preparation of phenol from cumene: a. When an alkaline solution of cumene (isopropyl benzene or 2-Phenylpropane) in sodium carbonate is oxidised by passing air or oxygen in the presence of cobalt naphthenate as a catalyst at 423 K, cumene hydroperoxide is obtained.

Most of the industrial methods used forpreparing phenols are same as used in the laboratory. Several methods have been used to synthesised phenols commercially. When chlorobenzene is heated with caustic soda at 3000C and 200 atm pressure, sodium phenoxide is formed which on acidification produces phenol.

Answer 2

Answer:

To prepare phenol, cumene is first oxidized in the presence of air of cumene hydro-peroxide. Then, cumene hydroxide is treated with dilute acid to prepare phenol and acetone as by-products.