Low viscosity COM (coal oil mixture) using tall-oil as an additive
✍ Scribed by Shigeru Maeda; Satoru Kanamori; Morio Imayoshi; Toshio Takeshita
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 565 KB
- Volume
- 65
- Category
- Article
- ISSN
- 0016-2361
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✦ Synopsis
Tall oil, an inexpensive by-product from pulp manufacturing (about one-tenth of the cost to those of ordinary surfactants), was found as an effective additive for COM (coal oil mixture) to provide good stability and low viscosity. The viscosity of COM (coal concentration: 50%) was as low as 2 Pa at 70°C after 25 daystorage by addition of only 1 y0 of tall-oil to COM. Tall-oil supported an increase in concentration of coal from 46 % to 52.5 %, maintaining usable viscosity. Structural viscosity (SV) of COM was proposed by the authors and defined as follows: SV = q(2.2) -~( ); where q(2.2) and ~( ) are the viscosities at low shear rate (2.2 s-l) and high shear rate (22 s-l), respectively. The SV was found to be a good parameter for predicting the sedimentation stability and the viscosity of COM after long-term storage in the case of Miike-COM.