Study on the preparation of impregnating pitch from modified coal tar pitch
Author(s): Gao Li-juan, Xu Yan, Wu Hong-yun, Zhao Xue-fei
Pages: 24-27
Year: 2014 Issue: 6
Journal: Carbon Techniques
Keyword: Impregnant pitch; coking value; softening point; viscosity;
Abstract: The purified pitch with low QI was prepared from modified coal tar pitch through solvent hot filtering process, then im-pregnant pitch were obtained by the method of blowing in N2 to remove off light component. The effects of reaction temperature, re-action time and N2 flow rate on the QI content, softening point and coking value of the impregnant pitch were studied. The experi-mental results showed that, when the reaction condition was 250℃for 40 min with N2 flow of 40 L/h, the obtained products showed the softening point of 88 ℃, QI content of <0.5%, TI content of 22.25%, coking value of 55.77%. Compared with raw materials of pitch, the contents of carbonyl, amine compounds and aromatic structure of impregnant pitch decreased and saturated hydrocarbon structures increased by infrared spectrum analysis. Thermo-gravimetric analysis showed that small molecular components of impreg-nant pitch were more than the raw materials of pith. Viscosity measurement revealed that the viscosity-temperature curve was nega-tive exponent relationship between 130~200℃.
Pages: 24-27
Year: 2014 Issue: 6
Journal: Carbon Techniques
Keyword: Impregnant pitch; coking value; softening point; viscosity;
Abstract: The purified pitch with low QI was prepared from modified coal tar pitch through solvent hot filtering process, then im-pregnant pitch were obtained by the method of blowing in N2 to remove off light component. The effects of reaction temperature, re-action time and N2 flow rate on the QI content, softening point and coking value of the impregnant pitch were studied. The experi-mental results showed that, when the reaction condition was 250℃for 40 min with N2 flow of 40 L/h, the obtained products showed the softening point of 88 ℃, QI content of <0.5%, TI content of 22.25%, coking value of 55.77%. Compared with raw materials of pitch, the contents of carbonyl, amine compounds and aromatic structure of impregnant pitch decreased and saturated hydrocarbon structures increased by infrared spectrum analysis. Thermo-gravimetric analysis showed that small molecular components of impreg-nant pitch were more than the raw materials of pith. Viscosity measurement revealed that the viscosity-temperature curve was nega-tive exponent relationship between 130~200℃.
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