Bergvik Kemi Ab

Fluid-carbon International Ab

Helena Ljusberg-Wahren

A dispersing agent for solid particles in water, which is a tall oil pitch partially esterified with a polyalkylene glycol mainly composed of ethylene oxide units of a molecular weight of above 600 or a monoester or monoether thereof and optionally also aminated having a residual acid value higher than 3, and a process for preparing said dispersing agent which comprises heating the two reactants at 200.degree.-285.degree. C. for so long that the maximum acid value of the reaction mixture at this temperature is reduced at least 2 units. The dispersing agent can be used to disperse coal particles in water.

Coal-water dispersion agent

A coal-water dispersion comprising coal particles dispersed in water and a dispersing agent comprising polymerized fatty acids, polymerized rosin acids and/or polymerized fatty or rosin acid derivatives which have been partially esterified with a polyalkylene glycol or monoester or monoether thereof, having a residual acid value higher than 3.

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Soderhamn, Sweden

Helena Ljusberg-Wahren