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:
Sep. 30, 1980
Filed:
Dec. 04, 1978
James A Cook, Jr, Barberton, OH (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
This invention relates to the treatment of an isomeric mixture of chloronitrobenzenes to provide a product higher in meta-chloronitrobenzene content, and lower in ortho-chloronitrobenzene and para-chloronitrobenzene content. In particular, a liquid mixtuure of ortho-, meta-, and para-chloronitrobenzene isomers containing a major amount of the meta isomer is solidified by dispersing the isomeric mixture in a partially miscible solvent at temperatures below the melting point of meta-chloronitrobenzene, the solvent and its temperature being selected so that the chloronitrobenzene isomers are sparingly soluble in the solvent. More particularly, a liquid isomeric mixture of ortho-, meta- and para-chloronitrobenzene containing a major amount of meta-chloronitrobenzene is dispersed in a lower alkylene glycol solvent that is at a temperature below the melting point of meta-chloronitrobenzene. A finely divided solid is collected, for example, by filtration, to provide a product enriched in meta-chloronitrobenzene.