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US 4,879,369 AGranted
Method of removing lignin from tall oil
AssigneeWestvaco Corporation
InventorCarlton G. Force
Life of this patent
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Abstract
Lignin is removed from a crude tall oil in the production of tall oil fractions suitable for use as chemical ingredients and additives in other products by sparging the crude tall oil at a temperature of between about 350.degree. F. to 400.degree. F. with a carrier gas to depolymerize and remove from the tall oil lower molecular weight lignin materials.
Claims4
A method of processing tall oil for use as an emulsifier in the polymerization of rubber comprising the steps of:
- sparging crude tall oil at a temperature of between about 350.degree. F. and 400.degree. F. with a carrier gas for at least about one hour to depolymerize and remove lower molecular weight lignin materials from the crude tall oil, then
- heat-treating the sparged crude tall oil at a temperature of between about 500.degree. F. and 525.degree. F. for about two hours to polymerize any lignin remaining therein, then
- fractionally distilling the crude tall oil, said distilling including the removal of a pitch fraction containing polymerized lignin, then
- disproportionating the tall oil by heating the distilled tall oil in the presence of a disproportionation catalyst at a temperature of about 425.degree. F. and then
- sparging the disproportioned tall oil with a carrier gas to remove said disporportionation catalysts.
2 more elements
A method of removing lignin from tall oil comprising the steps of:
- sparging crude tall oil at a temperature of between about 350.degree. F. to 400.degree. F. with a carrier gas for at least about one hour to depolymerize and remove lower molecular weight lignin materials from the crude tall oil, then
- heat-treating the sparged crude tall oil at a temperature of between about 500.degree. F. and 52.degree. F. for about two hours to polymerize any lignin remaining therein and then
- fractionally distilling sparged, heat-treated crude tall oil, said distilling including the removal of a pitch fraction containing polymerized lignin.
Dependencies are inferred from the claim text.