淮北煤田煤中有机硫的测定与分析

DETERMINATION OF SULFUR-CONTAINING ORGANIC COMPOUNDS IN COALS FROM HUAIBEI COALFIELD,ANHUI PROVINCE,CHINA

以淮北煤田16个煤样品为研究对象,对每个样品均进行了元素分析,并进行了索氏抽提实验,采用气相色谱-质谱仪对提取液进行测试分析.结果表明,淮北煤田4煤层和5煤层是以低硫煤为主的烟煤,煤中的有机硫主要为含硫多环芳烃(PASHs),其中又以二苯并噻吩及其甲基取代物和苯并萘并噻吩及其甲基,二甲基取代物为主.通过比较相对含量,发现5煤层的PASHs普遍比4煤层高,且PASHs的含量与O/C值成反相关,与煤的变质程度关系密切,煤化程度愈高,煤组成的芳构化程度也愈高,PASHs含量亦愈高.同时还发现当煤中硫含量在0.5%左右时,煤中PASHs含量达最高.

Sixteen samples from the Huaibei coalfield （seam g and seam 5 ） were studied by Soxhlet extract. The sulfur-containing organic compounds in the extractions obtained from anthracite were identified by gas chromatography-mass spectrometry. 10 different organic sulfur compounds were found in seam 4 coal, while 15 organic sulfur compounds were identified in seam 5 coal. They are dibenzothiophene, benzo （b） naphtho（2,3-d） thiophene and their methyl, imethyl derivatives or their isomers. Relative abundance polyaromatic sulfur hydrocarbons （PASHs） were determined in coal smples from seam 4, while they are very low compared to that in coal samples from seam 5. PASHs in coal samples from seam 5 increase with the reducing of O/C ratio. This indicate the osculation between the PASHs content and O/C ratio. Rrlative abundance of PASHs is maximum when sulfur abundance of the samples reach about 0. 5% , for the samples are low-sulfur coals.