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AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsAnna Kalliola, Tiina Liitiä, Tarja Tamminen, Tapio Vehmas
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The present invention concerns a process for oxidizing lignin at alkaline conditions. This oxidized lignin can be used as a dispersant in various end-products, for example as a renewable plasticizer in cement-containing products, such as concrete, where the ability of the oxidized lignin to endure alkaline conditions is an advantage. Further, the invention concerns a concrete mixture containing aggregate, cement, water and a plasticizer formed of oxidized lignin, and a process for producing such a concrete mixture. The oxidized lignin can be manufactured using a process, where the lignin starting material is reacted with an oxidizing agent in solution in alkaline conditions.
A concrete mixture containing aggregate, cement, water and a plasticizer formed of oxidized lignin, said oxidized lignin having been manufactured in a process where a lignin starting material was reacted with an oxidizing agent in solution, said reaction having been carried out in alkaline conditions, at a pH within the range 8-14, using a load of oxidizing agent of 10-95 w-% calculated based on the weight of the lignin.
A process for manufacturing a concrete mixture, comprising mixing aggregate, cement, water and a plasticizer formed of oxidized lignin, said oxidized lignin having been manufactured in a process where a lignin starting material was reacted with an oxidizing agent in solution, said reaction having been carried out in alkaline conditions, at a pH within the range 8-14, using a load of oxidizing agent of 10-95 w-% calculated based on the weight of the lignin.
Dependencies are inferred from the claim text.