CAJ | 학술논문

采用酸洗脱灰、酸洗和Na/Co离子交换对两种低阶煤( MM和LY)进行预处理,然后以1-甲基萘为溶剂对预处理煤进行热溶剂提质萃取,把煤分成提质煤(UC)、高分子量萃取物(deposit)和低分子量萃取物(soluble)3种主要固体组分,以及少量水和气体产物。结果表明,通过脱灰和离子交换均提高了两种萃取物的收率及碳含量,并明显促进了煤中含氧官能团的脱除。脱灰后MM煤的高分子量萃取物收率从3.5%增加到9.5%,Na 离子交换 LY 的低分子量萃取物的碳含量高达85.3%、氧含量低于6.4%。离子交换对两种萃取物的物理化学性质有明显的影响,Na+的影响尤为显著。酸洗脱灰和离子交换对低阶煤热溶剂提质萃取有明显促进作用。
채용산세탈회、산세화Na/Co리자교환대량충저계매( MM화LY)진행예처리,연후이1-갑기내위용제대예처리매진행열용제제질췌취,파매분성제질매(UC)、고분자량췌취물(deposit)화저분자량췌취물(soluble)3충주요고체조분,이급소량수화기체산물。결과표명,통과탈회화리자교환균제고료량충췌취물적수솔급탄함량,병명현촉진료매중함양관능단적탈제。탈회후MM매적고분자량췌취물수솔종3.5%증가도9.5%,Na 리자교환 LY 적저분자량췌취물적탄함량고체85.3%、양함량저우6.4%。리자교환대량충췌취물적물이화학성질유명현적영향,Na+적영향우위현저。산세탈회화리자교환대저계매열용제제질췌취유명현촉진작용。
Dehydration and upgrading are essential pretreatment methods for efficient utilization of low-rank coal. In previous works the authors employed degradative solvent extraction method to dehydrate and upgrade low-rank coals and fractionate them into several fractions. For further study of this method, two low-rank coals ( MM and LY) were pretreated by acid washing for demineralization or acid washing and Na/Co ion-exchange. The pretreated and raw coals were then extracted by 1-methylnaphthalene (1-MN) at 350℃ and fractionated into upgraded coal ( UC) , high molecular weight extract ( Deposit) , low molecular weight extract ( soluble) , as well as a little H2 O and gas products. The results show that both acid washing and ion-exchange enhance the yields and carbon contents of the two extracts. Ion-exchange obviously promotes the removal of oxygen-containing functional group during extraction. The yield of high molecular weight extract of demineralized MM increases from 3 . 5% to 9 . 5%, and the carbon content and oxygen content of low molecular weight extract of Na ion-exchanged LY are as high as 85. 3% and less than 6. 4%, respectively. Ion-exchange has a distinct influence on physical and chemical properties of the extracts. The influence of Na ion-exchange is especially remarkable. Thus, demineralization and ion-exchange have evident promotion for the degradative solvent extraction of low-rank coal.