回收NMP-CS2混合溶剂萃取原煤基本性状研究

以平顶山煤和徐州煤为原料,利用回收NMP与CS_2混合溶剂和反萃取剂将两种煤全组分分离成萃余煤组分、沥青质组分、精煤组分和轻质组分四大族组分,主要对比原煤及各族组分的真密度、工业分析与元素分析。结果表明,萃余煤组分真密度最大,分别为1.59和1.45,精煤组分与沥青质组分真密度低于原煤。轻质组分具有较多非共价键成键点,易与水分子形成氢键,水分含量最高,分别为6.09%和5.77%,而萃余煤组分水分含量最低,分别为0.96%和0.63%。沥青质组分接近无灰。挥发分含量以轻质组分沥青质组分精煤组分原煤萃余煤组分顺序降低。C元素含量以精煤组分与沥青质组分相对较高,萃余煤组分C元素含量较两者偏低,分别为80.91%和80.65%。轻质组分中N、O和S元素含量较高,C元素含量最低。

Study on basic properties of raw coal extracted by recycling NMP-CS2 mixed solvent

CS₂/NMP mixed solvent and strippant were used to separate Pingdingshan coal and Xuzhou coal into four groups:residue,asphaltene component,ultra-pure coal and light component.The true density,proximate analysis and ultimate analysis of raw coal and its group components were compared and analyzed.The result shows that the true density of residue are the highest,which are 1.59 and 1.45 respectively.The true density of asphaltene component and ultra-pure coal are lower than raw coal.Light components have many non-covalent bonding points,which are easy to form hydrogen bonds with water molecules.The moisture contents of light component are the highest,which are 6.09% and 5.77% respectively,while the moisture contents of residue components are the lowest, which are 0.96% and 0.63% respectively.Asphaltene components are close to ashless.The content of volatile decreases in the order of light component>asphaltene component>ultra-pure coal>raw coal>residue.The contents of C element are relatively high in ultra-pure coal and asphaltene component,and lower in residue, which are 80.91% and 80.65% respectively.The content of N,O and S element in light component is higher and C element is lowest.