Production of halogenated benzene derivative

Abstract

Abstract PURPOSE:To selectively separate the objective substance by subjecting an isomer mixture of halogenated benzene derivatives to distillation or diffusion treatment, removing hydrogen halides, water and low-boiling components contained in the above-mentioned mixture and bringing the resultant mixture into contact with a zeolite adsorbent. CONSTITUTION:An isomer mixture of halogenated benzene derivatives (e.g., dichlorobenzene or chlorotoluene) is subjected to diffusion treatment for blowing an inert gas and removing volatile components or distillation treatment by a conventional method to remove hydrogen halides, trace amounts of water and low-boiling components formed as a by-product and the resultant mixture is then brought into contact with a zeolite adsorbent (e.g. ZSM-5) to afford the objective isomer. Since deterioration of the zeolite adsorbent can be prevented by previously removing the hydrogen halides, water and low-boiling components formed as the by-product, the objective isomer can be separated for a long period even without deteriorating productivity.

Inventors

• 👤 Takashi Kanai
• 👤 貴詩 金井
• 👤 Michio Kimura
• 👤 木村　道夫
• 👤 Yoshio Noguchi
• 👤 野口　義夫

Bibliographic Details