Patents by Inventor Francis M. Schoeffler

Francis M. Schoeffler has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the purification of 1,3-dihalobenzene from an isomeric mixture of dihalobenzenes
    Patent number: 5382725
    Abstract: 1,3-dihalobenzene, particularly 1,3-dichlorobenzene, is produced in high efficiency from a mixture containing the subject compound and its corresponding 1,4-isomer by a special process in which the dihalobenzene mixture is treated with polyethylene glycols of varying molecular weight and the resulting slurry is filtered to remove a complex of 1,4-dihalobenzene and polyethylene glycol as a solid and the 1,3-dihalobenzene as the filtrate.The 1,4-dihalobenzene complexed with the polyethylene glycol can be recovered by a flash distillation under vacuum and the residue containing the polyethylene glycol can be recycled.The purity of the 1,3-dihalobenzene obtained by this process can further be improved by subjecting the product obtained after the polyethylene glycol treatment to a low temperature crystallization process where 1,3-dihalobenzene can be selectively crystallized to a purity of above 99%.
    Type: Grant
    Filed: February 18, 1994
    Date of Patent: January 17, 1995
    Assignee: Standard Chlorine of Delaware Inc.
    Inventors: Jacob George, Kantilal B. Desai, Francis M. Schoeffler