...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Extraction of Huadian oil shale with water in sub- and supercritical states
【24h】

Extraction of Huadian oil shale with water in sub- and supercritical states

机译：亚临界和超临界水萃取华电油页岩

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Water extraction experiments were carried out in a semi-continuous operation apparatus with the substrate being Huadian oil shale from Jilin Province of China. Both non-isothermal and isotherma] extraction techniques were employed. The effects of temperature and pressure were investigated in terms of degree of conversion, extract as well as gas yield and formation rate, and the compositions of extract and gas. For non-isothermal extraction, temperature varied from ambient value to 500 deg C and pressure stayed either at 15 or 30 MPa. Isothermal extraction experiments were carried out at four levels of temperature from subcritical to supercritical conditions and two supercritical pressures of 25 and 30 MPa. The results indicated that the extract was obtained mainly in the temperature range between 300 deg C and 500 deg C and gas formation was only observed at temperatures higher than 350 deg C. A maximum formation rate exists for extract and gas at about 390 deg C. The major extract component is asphaltene and the major gas formed is CO_2 for non-isothermal extraction. The large increase in the formation rate of H_2 and CH_4 at high temperature results in a secondary increase of gas formation rate starting at 460 deg C. The isothermal extractions show that a conversion plateau exists when temperature is over 400 deg C where a maximum extract yield was also found. The experimental findings were explained well in terms of the variation of hydrocarbon solubility in water and the degree of pyrolysis of oil shale. Water extraction shows a higher conversion, slightly lower extract yield, more oil content than toluene extraction. The isothermal results re-establish that non- isothermal extraction technique is a useful tool in searching the optimal extraction conditions.
机译：在半连续操作装置中进行水提取实验，底物是来自中国吉林省的华电油页岩。使用了非等温和等温线提取技术。研究了温度和压力对转化率，萃取物，产气率和形成速率，萃取物和气体组成的影响。对于非等温萃取，温度从环境温度变化到500摄氏度，压力保持在15或30 MPa。在从亚临界到超临界条件的四个温度水平以及两个25和30 MPa的超临界压力下进行了等温萃取实验。结果表明，提取物主要是在300℃至500℃的温度范围内获得的，只有在高于350℃的温度下才能观察到气体的形成。在390℃左右，提取物和气体的最大形成速率存在。非等温萃取的主要提取组分为沥青质，形成的主要气体为CO_2。高温下H_2和CH_4的生成速率大幅度增加导致从460摄氏度开始的气体生成速率的二次增加。等温萃取表明，当温度超过400摄氏度时，存在转化平台，最大萃取率也被发现。根据烃在水中的溶解度变化和油页岩的热解程度很好地解释了实验结果。与甲苯萃取相比，水萃取显示出更高的转化率，萃取率略低，油含量更高。等温结果重新证明，非等温萃取技术是搜索最佳萃取条件的有用工具。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号