Patents by Inventor Kinjiro Ikeda

Kinjiro Ikeda 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).

  • Patent number: 4639294
    Abstract: A process for producing sorbic acid is described, by first reacting crotonaldehyde with ketene to prepare a polyester, then decomposing the polyester with hydrochloric acid, separating the crude sorbic acid from the reaction solution, and purifying the separated sorbic acid, said purifying step comprising the following steps:(a) continuously dissolving the crude sorbic acid in petroleum at a temperature in the range of from 100.degree. to 140.degree. C. while evaporating the residual water and hydrochloric acid from the solution of the sorbic acid in petroleum;(b) separating the tar content from the petroleum solution in a separation column at a temperature in the range of from 100.degree. to 140.degree. C.; and(c) subjecting the mixture of sorbic acid and petroleum to flash evaporation in a film-type evaporator at a reduced pressure in the range of from 20 to 60 mmHg, with the evaporation residue being withdrawn from the bottom of the evaporator and recycled to step (a).
    Type: Grant
    Filed: July 16, 1985
    Date of Patent: January 27, 1987
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Noboru Kamei, Kinjiro Ikeda, Keishi Aoyama, Seitaro Hamano