James L O'Hara

US Patent:

41548663, May 15, 1979

Filed:

Aug 24, 1976

Appl. No.:

5/717369

Inventors:

Balys Dainius - Schaumburg IL
Charles Dame - Naperville IL
James O'Hara - Marietta GA

Assignee:

Stange Co. - Chicago IL

International Classification:

A23L 1232

US Classification:

426650

Abstract:

A liquid smoke product which contains no detectable amount of 3,4-benzopyrene (also known as benzo(a)pyrene) consists essentially of propylene glycol together with those components of the heavy, essentially water insoluble material that settle out of an aqueous condensation of wood smoke (hereinafter called "wood tar") which codistill at or below the boiling point of propylene glycol and most of which are soluble in propylene glycol. A method of making the above product by mixing about three parts by weight of wood tar with one part by weight propylene glycol to form a feed material, heating said feed material to about 280. degree. F. to 290. degree. F. , reducing the pressure to about 100 mm. of mercury to cause codistillation of the desired components with the propylene glycol and thereby form a liquid fraction and a vapor fraction, entirely separating the vapor fraction from the liquid fraction, and condensing the vapor fraction which is then treated with a small percentage of activated carbon to assure that the amount of 3,4-benzopyrene is below 0. 5 parts per billion, by weight.