Lignin composition, method of producing the same and dispersing agent for cement used the same
AssigneeNippon Paper Industries Co., Ltd.
InventorsHideaki Ishitoku, Toshihiro Sugiwaki, Masanobu Kawamura, Tomoyuki Nakamoto
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Abstract
A lignin composition having a content of aluminum or iron or both at 0.05 to 5 wt. % (based on the solids of the lignin solution) and a content of extracts with chlorotrifluoroethylene dimer at 0.01 to 0.4 wt. % (based on solids in lignin solution). The lignin compositions possess high surface tension and are suitable as dispersing agents for cement.
Claims10
A method of producing a lignin composition comprising adding a water-soluble trivalent aluminum compound selected from the group consisting of aluminum sulfate, aluminum chloride, aluminum acetate and sodium aluminate, or a water-soluble iron compound selected from the group consisting of ferrous sulfate, ferric sulfate, ferrous chloride and ferric chloride to a lignin solution, or a mixture of said water-soluble aluminum compound and said water-soluble iron compound and causing said solution and said water-soluble iron or aluminum compound to react by heating at a temperature in the range of 40.degree. C to 100.degree. C. and at a pH in the range of from 5 to 8.
A lignin composition prepared by a process comprising adding a water-soluble trivalent aluminum compound selected from the group consisting of aluminum sulfate, aluminum chloride, aluminum acetate and sodium aluminate, or a water-soluble iron compound selected from the group consisting of ferrous sulfate, ferric sulfate, ferrous chloride and ferric chloride to a lignin solution, or a mixture of said water-soluble aluminum compound and said water-soluble iron compound and causing said solution and said water-soluble iron or aluminum compound to react by heating at a temperature in the range of 40.degree. C. to 100.degree. C. and at a pH in the range of from 5 to 8.
Dependencies are inferred from the claim text.