...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Structure of water/solids/asphaltenes aggregates and effect, of mixing temperature on settling rate in solvent-diluted bitumen
【24h】

Structure of water/solids/asphaltenes aggregates and effect, of mixing temperature on settling rate in solvent-diluted bitumen

机译：水/固体/沥青集料的结构以及混合温度对溶剂稀释沥青中沉降速率的影响

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

Emulsified water droplets (WD), dispersed solids (DS), and precipitated asphaltenes (PA) form aggregates when bitumen emulsions are treated with aliphatic solvents. The WD/DS/PA aggregates in solvent-diluted bitumen exhibit zone settling and the settling rate is strongly influenced by aggregate structure. In this work, procedures were developed for determining structural parameters of the aggregates. The average porosity of the aggregates was found to be 0.40-0.45 for a system using a 50/50 by wt light n-pentane-hexane solvent mixture (C5C6) at a solvent-to-bitumen ratio (S/B, by wt) of 2.0 and 0.70-0.75 for a system using heavier n-heptane (C7) solvent at S/B = 3.0. Consequently, the effective aggregate density for the C5C6 solvent system (approximately 1.00 g/ml) is higher than that for the C7 solvent system (approximately 0.87 g/ml). The aggregates formed in the C5C6 solvent contain embedded or attached water droplets larger than 20 mum, while the water droplets in the aggregates using the C7 solvent are generally smaller than 10 mu m. The average volume fraction of the aggregates in the hindered settling zone is 0.12-0.13 at all studied conditions. Higher temperature (e.g. 50-120 deg C) for mixing of the bitumen emulsion and solvent leads to larger aggregates and results in a significant increase in the settling rate of the aggregates. Mixing at elevated temperature provides an efficient means of increasing settling flux in settlers that are used to treat the solvent-diluted bitumen emulsions, especially when the settlers are preferably operated at near-ambient conditions (e.g. about 30 deg C and less than 350 kPa).
机译：当用脂肪族溶剂处理沥青乳液时，乳化的水滴（WD），分散的固体（DS）和沉淀的沥青质（PA）形成聚集体。溶剂稀释的沥青中的WD / DS / PA聚集体表现出区域沉降，并且沉降速率受聚集体结构的强烈影响。在这项工作中，制定了确定骨料结构参数的程序。对于使用50/50 wt％轻质正戊烷/正己烷溶剂混合物（C5C6），溶剂与沥青比率（S / B，按重量计）的系统，骨料的平均孔隙度为0.40-0.45对于使用S / B = 3.0的较重正庚烷（C7）溶剂的系统，其重量比为2.0和0.70-0.75。因此，C5C6溶剂系统的有效聚集体密度（约1.00 g / ml）高于C7溶剂系统的有效聚集体密度（约0.87 g / ml）。在C5C6溶剂中形成的聚集体包含大于20微米的嵌入或附着的水滴，而使用C7溶剂的聚集体中的水滴通常小于10微米。在所有研究条件下，受阻沉降区中骨料的平均体积分数为0.12-0.13。用于沥青乳液和溶剂混合的较高温度（例如50-120℃）导致较大的聚集体，并导致聚集体的沉降速率显着提高。高温下的混合提供了一种增加沉降器中沉降通量的有效方法，该沉降器用于处理溶剂稀释的沥青乳液，尤其是当沉降器优选在接近环境条件（例如约30摄氏度且小于350 kPa）下运行时。

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