METHOD OF OBTAINING A SMOKING AGENT

摘要

The present invention concerns a process of preparing a food smoke additive which comprises the steps of, destructively distilling cellulose and/or lignin material to form tar or smoke condensate, removing organic nitric bases from the condensate by means of an aqueous solution of a mineral acid or as a compound formed by reaction with an acid which is indecomposable at a temperature up to 250.degree.C, distilling remaining tar or smoke condensate in two stages, a first said stage comprising distillation at a pressure of between 20 - 30 mm Hg with the addition of zinc, aluminium or iron dust and collecting the fraction boiling below 100 - 110.degree.C, and a second said stage com-prising distillation of said 100 - 110.degree.C boiling fraction at a pressure not exceeding 20 mm Hg with the addition of polyhydric alcohol and collecting the fraction containing compounds-exhibiting a boiling point of up to 250.degree.C at 20 mm Hg, heating the food smoke additive plus polyhydric alcohol thus collected to a temperature of 50.degree. - 90.degree.C to separate out an alcohol layer which is removed from the food smoke additive layer, said steps of removing organic nitric bases and said two-stage distillation of remaining tar or smoke condensate being interchangeable.