The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2007
Filed:
Sep. 03, 2003
Takashi Wakasugi, Fukushima, JP;
Tsugio Nonaka, Fukushima, JP;
Tadashi Miyakawa, Fukushima, JP;
Takanobu Hanabusa, Fukushima, JP;
Kazuhiko Sunagawa, Fukushima, JP;
Shigeru Mizusawa, Fukushima, JP;
Takashi Wakasugi, Fukushima, JP;
Tsugio Nonaka, Fukushima, JP;
Tadashi Miyakawa, Fukushima, JP;
Takanobu Hanabusa, Fukushima, JP;
Kazuhiko Sunagawa, Fukushima, JP;
Shigeru Mizusawa, Fukushima, JP;
Kureha Corporation, Tokyo, JP;
Abstract
In a process for preparing p-dichlorobenzene by nuclear chlorination of benzene and/or chlorobenzene as the starting material with chlorine molecules, chlorination is carried out using aluminum chloride in an amount of 0.1–3 millimols per mol of the starting material and phenothiazines such as 10H-phenothiazine-10-carboxylic acid phenyl ester in an amount of 0.1–0.9 mols per mol of aluminum chloride so as to be a chlorination degree in a range of 1.2–2.5, by which p-dichlorobenzene can be obtained in a high para-selectivity and a short reaction time.