SLUDGE DEHYDRATING AGENT.

摘要

A novel process for producing an acrylic polymer serving as a sludge dehydrating agent, which polymer contains tertiary amino group which are neither quaternized nor converted into corresponding salts and has a high molecular weight, which process comprises preparing an acrylic monomer containing a tertiary ammonium carbonate group by the reaction of an aqueous solution of an acrylic monomer containing a tertiary amino group with carbon dioxide, polymerizing the obtained monomer alone or copolymerizing the monomer with another copolymerizable vinyl monomer to prepare a polymer containing tertiary ammonium carbonate units, and decarbonating the polymer by heating and/or evacuating. Among others, especially an acrylic polymer containing at least 5 mol% of the tertiary amino group units and comprising a water-soluble vinyl polymer having the intrinsic viscosity [ eta ] of 1 dl/g or above is useful as an excellent sludge dehydrating agent.