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The authors synthesized polyethylenepolyamine base multi-branched high molecular weight nonionic surface active agents and studied their physicochemical properties so as to evaluate their effects for improving the fluidity of coal-water slurry (CWS). The following results were obtained.1) A surface active agent prepared by the addition of propylene oxide (PO) and ethylene oxide (EO) to polyethylenepolyamine (PEPA) improved the fluidity of CWS.2) Surface active agents prepared by adding only EO to PEPA brought about less improvement than the above mentioned agent.3) The effects of the agents depended on the molecular weight of polyoxyalkylene side chain and improvement was best at a molecular weight of 5, 000 or more.4) Using a small amount of the above agent, Tatung coal CWS with low viscosity and high coal concentration was made.

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Effects of Polyethylenepolyamine Base Multi-Branched High Molecular Weight Nonionic Surface Active Agents on Fluidity of Highly-Loaded Coal-Water Slurry