Patent GB-773245-A (GB)
Title: Process for the total or partial elimination of industrial odours
Inventor: MEULY WALTER CHRISTIAN
IPC: D21C3/22
Filed: 1954-02-22
Abstract: Obnoxious odours arising from the digestion of cellulosic pulp-producing material, or from the concentration of the liquors separated from such pulp after digestion, are masked by adding to the liquor 1-100 parts per million of a mixture of odorant organic compounds, each of which has an odour threshold (as defined) of less than 10 parts per million, preferably less than 1 part per million. The mixture of odorant compounds is preferably made up of at least three components, of which at least one boils below 200 DEG  C. (I); at least one boils in the range 200-250 DEG  C. (II); and at least one boils above 250 DEG  C. (III), at least one member of each of the Classes I, II, and III being present to an extent greater than 1 per cent of the deodorant mixture.  Suitably, there is used a mixture of at least 5-10 organic compounds, preferably including at least two members of each of the forementioned classes.  Class (I) includes butyraldehyde, valeraldehyde, caprylic aldehyde, butylamine, pyridine and alkylpyridines, nitrobenzene, octan-1-ol, octan-2-ol, dipentene, benzaldehyde and choline.  Class (II) includes camphor, borneol, isoborneol, citronellal, citronella oil, acetophenone, geraniol, phenylethyl alcohol, cedarwood oil, pine oil and terpineol.  Class (III) includes ionones, ionone terpenes, skatole, indole, 2 : 3-dimethylindole, alpha-naphthylamine, alphanaphthyl methyl ether, beta-naphthylethyl ether, benzophenone, methyl naphthyl ketone, diphenyl ether, diphenyl, diphenylmethane, methyl beta-styryl ketone, lauryl alcohol and benzyl trimethylammonium hydroxide.  U.S.A. Specification 2,136,844 is referred to.ALSO:Obnoxious industrial odours, particularly those arising from the digestion of cellulosic pulp producing material or from the concentration of the liquors separated from the pulp after digestion, are masked by adding to the liquor 1 to 100 parts per million of a mixture of odorant organic compounds, each of which has an odour threshhold (as defined) of less than 10 parts per million, preferably less than 1 part per million. The mixture of odorant compounds is preferably made up of at least three components, of which at least one boils below 200 DEG C. (I) at least one boils in the range 200 DEG -250 DEG C. (II), and at least one boils above 250 DEG C. (III), at least one member of each of the classes I, II, and III being present to an extent greater than 1 per cent of the deodorant mixture.  Suitably there is used a mixture of at least 5 to 10 organic compounds, preferably including at least two members of each of the forementioned classes.  Class I includes butyraldehyde, valeraldehyde, caprylic aldehyde, butylamine, pyridine, and alkylpyridines, nitrobenzene, octan-1-ol, octan-2-ol, dipentene, benzaldehyde and choline. Class II includes camphor, borneol, iso-borneol, citronellal, citronella oil, acetophenone, geraniol, phenylethyl alcohol, cedarwood oil, pine oil, and terpineol.  Class III includes ionones, ionone terpenes, skatole, indole, 2 : 3-dimethylindole, alpha-naphthylamine, alpha-naphthyl methyl ether, beta-naphthyl ethyl ether, benzophenone, methyl naphthyl ketone, diphenyl ether, diphenyl, diphenylmethane, methyl beta-styryl ketone, lauryl alcohol and benzyl trimethylammonium hydroxide.  U.S.A. Specification 2,136,844 is referred to.ALSO:Obnoxious industrial odours, particularly those arising from the digestion of cellulosic pulp producing material, or from the concentration of the liquors separated from the pulp after digestion are masked by adding to the liquor 1-100 parts per million of a mixture of odorant organic compounds, each if which has an odour threshold (as defined) of less than 10 parts per million, preferably less than 1 part per million.  The mixture of odorant compounds is preferably made up of at least three components, of which at least one boils below 200 DEG C. (I), at least one boils in the range 200-250 DEG C. (II), and at least one boils above 250 DEG C. (III), at least one member of each of the classes I, II and III being present to an extent greater than 1 per cent of the deodorant mixture.  Suitably there is used a mixture of at least 5-10 organic compounds, preferably including at least two members of each of the fore-mentioned classes.  Class I includes butyraldehyde, valeraldehyde, caprylic aldehyde, butylamine, pyridine and alkyl-pyridines, nitrobenzene, octan - 1 - ol, octan - 2 - ol, dipentene, benzaldehyde and choline.  Class 11 includes camphor, borneol, iso - borneol, citronellal, citronella, citronella oil, acetophenone, geraniol, phenylethyl alcohol, cedarwood oil, pine oil, and terpineol.  Class III includes ionones, ionines terpenes, skotole, indole, 2:3-dimethylindole, alpha-naphthylamine, alpha-naphthyl methyl ether, beta - naphthyl ethyl ether, benzophenone, methyl naphthyl ketone, diphenyl ether, diphenyl, diphenylmethane, methyl beta - styryl ketone, lauryl alcohol and benzyl trimethylammonium hydroxide.  U.S.A. Specification 2,136,844 is referred to.