Raschig–Hooker process

The Raschig–Hooker process is a chemical process for the production of chlorobenzene and phenol from benzene.

The main steps in this process are the production of chlorobenzene from benzene, hydrochloric acid and oxygen, and the subsequent hydrolysis of chlorobenzene to phenol. The first step uses either a copper or iron chloride catalyst and exposes the materials to air at 200–250 °C. In the second step, the resulting chlorobenzene is introduced to steam at 450 °C over a silicon catalyst that hydrolyses the chlorobenzene, giving phenol and hydrogen chloride that can then be recycled back to the first step. Due to the two step nature, the Raschig–Hooker process can be used to produce either chlorobenzene or phenol.

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