In the present work, three medium softening point coal tar pitches were used for comparative thermal stability and under-storage stability investigation. Powders of the pitches were found to be different under storage...In the present work, three medium softening point coal tar pitches were used for comparative thermal stability and under-storage stability investigation. Powders of the pitches were found to be different under storage： one of the pitches was caked and slumped after 7-day or longer storage. For thermal stability investigation the soft temperature treatment （265℃） of coal tar pitches was used. Detailed study of initial and treated pitches was carried out. Experimental results demonstrated that LMW-HC （high low-molecular-weight hydrocarbons） and oxygen content influence pitch quality characteristics in a negative way under long-term storage and lead to highest properties change after thermal stability treatment.展开更多
文摘In the present work, three medium softening point coal tar pitches were used for comparative thermal stability and under-storage stability investigation. Powders of the pitches were found to be different under storage： one of the pitches was caked and slumped after 7-day or longer storage. For thermal stability investigation the soft temperature treatment （265℃） of coal tar pitches was used. Detailed study of initial and treated pitches was carried out. Experimental results demonstrated that LMW-HC （high low-molecular-weight hydrocarbons） and oxygen content influence pitch quality characteristics in a negative way under long-term storage and lead to highest properties change after thermal stability treatment.
