摘要
用色谱质谱联用技术测定了兖州烟煤和红庙褐煤在氮气下热解和加氢热解焦油的组成。在４５０℃～６５０℃的温度范围内考察了温度对热解和加氢热解苯类、酚类、萘类化合物产率的影响。结果表明兖州煤热解和加氢热解焦油中的正构烷烃以Ｃ８～Ｃ１０占优势，红庙煤中以Ｃ１７～Ｃ２０占优势。从热解产物看兖州煤和红庙煤的主体分子结构有着显著差别，兖州煤主要以稠环芳烃为主，其中的氧以氧杂环的形式掺杂在稠环结构中；红庙煤含有较多的酚羟基、酮、醚等官能团与碳骨架相连。加氢热解可以有效的脱除焦油中含氧、含硫官能团，改善焦油质量。
Coal derived tars obtained from pyrolysis(Py) and hydropyrolysis(HyPy) of Hongmiao lignite and Yanzhou bituminous coal were analyzed using GC and GCMS The effects of temperature from 450℃ to 650℃ on yields of BTX, PCX and naphthalene were also investigated It was shown that nalkane distributions for tars from Py and HyPy were different from those found from Soxhlet extracts which only contained free alkanes from accessible pores in coal Contents of long chain aliphatic hydrocarbons(mostly C 7～C 26 nalkanes) decreased greatly in HyPy because of further hydrocracking of aliphatic chains The predominant nalkanes in tars derived from Yanzhou bituminous coal were C 8～C 10 nalkanes, while in Hongmiao lignite tars were C 17 ～C 20 nalkanes It was concluded that the increasing maturity of coals was attended by a shift to shorter alkane chain length It is likely that there is a obvious difference between the network of Yanzhou and Hongmiao coals The main structure in Yanzhou coal is condensed aromatic nucleus, thus there are very high contents of benzene and methylbenzene in the tar produced in HyPy There are a lot of hydroxyl, carbonyl, quinone and ether functional groups linked with the network of Hongmiao lignite which are decomposed easily at temperatures as lower as 500℃ in HyPy Therefore, phenol and methylphenol are the predominant products The oxygen in Yanzhou coal was mainly in the form of heterocyclic compounds connected with crosslinking macromolecules which decompose at higher temperatures (above 600℃)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1997年第6期560-565,共6页
Journal of Fuel Chemistry and Technology
关键词
焦油组成
热解
加氢热解
煤结构
煤焦油
tar, composition, pyrolysis, hydropyrolysis, coal structure
