第七-八章-煤有机质的化学结构及方法选读.ppt

第七-八章-煤有机质的化学结构及方法选读.ppt

  1. 1、本文档共101页,可阅读全部内容。
  2. 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
  3. 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  4. 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
Complex intermolecular actions occur between two phases in coal. Coal organic matters are rich in aromatic ring structures (and always aliphatic rings as well). Coal macromolecules take these rings as structural units, and are polymerized by linkages of ―(CH2)n―、―O― and ―S― . The size and condensation degree of aromatic ring unit in coal increase with metamorphic grade of coal, while the number of linkages reduce. The small molecular phase of coal is also quite a complex organic system, and aliphatic, alicyclic and aromatic hydrocarbons as well as heteroaromatics and other polar compounds are involved. A composite model of coal The traditional two-phase structural model of coal based on the chemical covalence bonding has to be revised since recent discoveries of powerful mixed solvent such as CS2/NMP, giving extra high yields in coal extraction at room temperature. It is believed that the physically associated interactions play important roles in the structure of coal. A composite model of coal is suggested. The organic matter of coal is mainly composed of some parts: the rigid 3-D macromolecules linked with chemical bonds; the polar molecules of high and moderate molecular weights, corresponding to asphaltenes(沥青烯) and resins(树脂);  the hydrocarbons with lower molecular weights. The polar molecules are associated by physical interactions (such as hydrogen bonding(氢键), charge transfer interactions(电荷转移作用), π-π interactions of aromatic sheets, etc.) each other and with macromolecules to form the network structure(网状结构), in which some smaller nonpolar molecules are trapped. It looks reasonable to pay more attention to the geological conditions including the salt, water, minerals and environments of the sedimentation. The evolution process of physically associated interactions in the composite structure of coal and the generation of oil is thought to be intimately (密切地)influenced by these factors. 一、煤的物理结构 煤结构模型的局限性 尽管每一模型都有相关实验证据的有力支持,但没有一种模型可以解释所有的实验现象。也许对于煤

文档评论(0)

希望之星 + 关注
实名认证
内容提供者

该用户很懒,什么也没介绍

1亿VIP精品文档

相关文档