Decomposition inhibitors for high temperature storage and distillation of chlorinated phenols
AssigneeThe Dow Chemical Company
InventorLeonard R. Thompson
Life of this patent
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Abstract
The decomposition of chlorinated phenols, especially pentachlorophenol, during exposure to high temperatures (e.g., storage and distillation) is markedly reduced by incorporating into the molten chlorinated phenol at least about 0.25 percent by weight of said impure chlorinated phenol of at least one monohydric primary alcohol having at least 14 carbon atoms, one hydroxyl group, and devoid of any other heteroatoms or ether linkages; selected from the group consisting of straight-chain or branched monohydric primary alcohols or a mixture of said straight-chain or branched monohydric primary alcohols.
Claims10
A process for inhibiting the decomposition of chlorinated phenol during exposure to high temperatures, which comprises adding at least 0.25 percent by weight of said chlorinated phenol of at least one primary alcohol having at least 14 carbon atoms, one hydroxyl group, and devoid of any other heteroatoms and ether linkages, selected from the group consisting of straight-chain or branched monohydric primary alcohols and mixtures of said straight-chain or branched monohydric primary alcohols.
A process for purifying impure chlorinated phenol which comprises distilling said chlorinated phenol at subatmospheric pressures in the presence of at least about 0.25 percent by weight of said impure chlorinated phenol of at least one primary alcohol having at least 14 carbon atoms, one hydroxyl group, and devoid of any other heteroatoms and ether linkages, selected from the group consisting of straight-chain monohydric primary alcohols, branched monohydric primary alcohols and mixtures thereof, thereby separating said chlorinated phenol from higher boiling impurities.
Dependencies are inferred from the claim text.