Patents by Inventor Dennis Joseph Zak

Dennis Joseph Zak 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: 4085151
    Abstract: The process for the production of butynediol by reacting acetylene and formaldehyde in the presence of a particulate copper acetylide catalyst at temperatures from 60.degree. to 120.degree. C is buffered to a pH of 5.0 to 8.0 by a mixture of sodium carbonate and sodium bicarbonate. The buffer mixture is obtained by scrubbing the recycle gas stream from the reaction with an aqueous solution of sodium carbonate and optionally sodium bicarbonate in a countercurrent absorption tower. The liquid effluent from the tower is split, with a portion going to the reaction as the buffer and the balance being regenerated with sodium hydroxide and recycled to the tower.
    Type: Grant
    Filed: June 29, 1977
    Date of Patent: April 18, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Dennis Joseph Zak