A fuel of coal-water slurry (hereinafter simply called CWS) must be combustible in an as-prepared condition without previous dyhydration. For this purpose, it was necessary to increase the concentration of coal in CWS.
Thus, alcohol based multi-branched high molecular nonionic surface active agents were synthesized to evaluate their effects on the fluidity of CWS while measuring their physicochemical properties. The results indicated the following.
1) For CWS of Tatung coal, the coal concentration could not be increased beyond 59% in the absence of a surface active agent.
2) Copolymers prepared by adding propylene oxide and ethylene oxide to glycerol, diglycerol or sorbitol showed excellent fluidity. That is, by these agents, Tatung coal CWS was made having a viscosity of 1, 300 cP at a coal concentration of 71%.
3) Among the above copolymers, a multi-branched high molecular nonionic surface active agent, whose side chain had a molecular weight of 10, 000 or more and an ethylene oxide content between 85 and 95%, improved the fluidity of CWS most effectively.
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