Reichhold Chemicals

Robert J Goodwin

William H Wetzel

Joseph Amundsen

John E Wilkinson

Hsi-Lung Pan

Frederic J Shelton

The invention covers the use of novel co-catalysts as inhibitors that reduce the formation of undesirable chlorinated dioxins during the preparation of pentachlorophenol and tetrachlorophenol from phenol or lower chlorinated phenols.

Catalyst for reducing formation of chlorinated dioxins in manufacture of

This invention relates to new and improved chlorinated phenol water soluble wood treating compositions and methods for preservation of wood or products made from wood. In the general practice of this invention, wooden objects are treated with water soluble wood treating and preserving solutions consisting of blends of from 0.1% to about 50% by weight of a chlorophenol selected from a group consisting of pentachlorophenol and tetrachlorophenol and mixtures thereof, from about 1% to about 97% by weight aliphatic alcohols having from 1 to 6 carbon atoms and mixtures thereof, from about 0.2% to about 35% of a fatty acid amine oxide or a mixture of fatty acid amine oxides and other amines, and from about 1% to about 97% by weight water. In addition, these wood treating formulations may contain up to 10% by weight of added ingredients selected from the group of tetrasodium pyrophosphate, copper salts, sodium choromates, sodium gluconate, sodium citrate, sodium N-dihydroxyethylglycinate and/or up to 20% by weight ammonium or sodium lignin sulfonate. In practice of this invention, these compositions are incorporated into treating systems that adequately penetrate wood and deposit essentially non-leachable chlorophenols in the wooden objects.

Water soluble pentachlorophenol and tetrachlorophenol wood treating

This invention relates to new and improved chlorinated phenol water soluble wood treating compositions and methods for preservation of wood or products made from wood. In the general practice of this invention, wooden objects are treated with water soluble wood treating and preserving solutions consisting of blends of from 0.1% to about 50% by weight of a chlorophenol selected from a group consisting of pentachlorophenol and tetrachlorophenol and mixtures thereof, from about 1% to about 97% by weight aliphatic alcohols having from 1 to 6 carbon atoms and mixtures thereof, from about 0.2% to about 35% of a fatty acid amine oxide or a mixture of fatty acid amine oxides and other amines, and from about 1% to about 97% by weight water. In addition, these wood treating formulations may contain up to 10% by weight of added ingredients selected from the group of tetrasodium pyrophosphate, copper salts, sodium chromates, sodium gluconate, sodium citrate, sodium N-dihydroxyethylglycinate and/or up to 20% by weight ammonium or sodium lignin sulfonate. In practice of this invention, these compositions are incorporated into treating systems that adequately penetrate wood and deposit essentially non-leachable chlorophenols in the wooden objects.

Inhibitor for reducing formation of chlorinated dioxins in manufacture

Method of reducing formation of chlorinated dioxins in manufacture of

This invention relates generally to water soluble wood treating compositions and methods for preservation of wood or products made from wood. In the general practice of this invention, wooden objects are treated with water soluble wood treating and preserving solutions consisting of blends of (A) from 0.1% to about 50% by weight of a chlorophenol selected from a group consisting of pentachlorophenol and tetrachlorophenol and mixtures thereof (B) from about 2% to about 98% by weight aliphatic alcohols selected from the group consisting of n-butyl alcohol, secondary butyl alcohol, isobutyl alcohol, tertiary butyl alcohol and isopropyl alcohol and mixtures thereof (C) from about 0.56% to about 45% of an amine selected from the group consisting of ammonium hydroxide, triethyl amine, trimethyl amine, methyl amine and methyldiethanolamine and mixtures thereof and (D) from about 1% to about 97% by weight water. In addition, these wood treating formulations may contain up to 10% by weight of added ingredients selected from the group of tetrasodium pyrophosphate, copper salts, sodium chromates, sodium gluconate, sodium citrate, sodium n-dihydroxyethylglycinate and/or up to 20% by weight ammonium or sodium lignin sulfonate.

In a process for producing relatively pure commercially acceptable pentachlorophenol, comprising reacting, at a temperature ranging from about 10.degree. to about 190.degree. C., (A) a phenol consisting essentially of raw or commercial phenol which may contain, as impurities from other processes, some lower chlorophenols such as mono and dichlorophenols and mixtures thereof, and (B) chlorine, in the presence of (C) an acid catalyst from about 0.005 moles to about 0.016 moles per mole of (A) used, consisting essentially of aluminum chloride, ferric chloride, metal iron, aluminum tributoxide, antimony chloride, metallic antimony, stannous chloride, metallic tin, cuprous chloride and metallic copper; the improvement consisting of using (D) a sulfur containing co-catalyst selected from the group consisting of sulfur, thiophenol, para-chlorothiophenol, para, para'-dichlorophenyl sulfide, sodium hydrosulfide, 2,2'-thiobis (4,6-dichlorophenol) benzyl disulfide, dibenzothiophenol, benzyl-disulfide, diphenyl sulfide, diphenyl disulfide, di-isopentyl sulfide, naphthalene thiol, heptyl sulfide, hexochlorophenyl sulfide, dicresyl disulfide, dihexadecyl sulfide and dibenzothiophenol thiophenol, wherein components (A) and (B) constitute the sole reacting ingredients and components (C) and (D) constitute the catalytic system for promoting the reaction of components (A) and (B).

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Puyallup, WA, United States of America

Robert J Goodwin