...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Continuous mass crystallization of vitamin C in L(+)-ascorbic acid - Ethanol - Water system: Size-independent growth kinetic model approach
【24h】

Continuous mass crystallization of vitamin C in L(+)-ascorbic acid - Ethanol - Water system: Size-independent growth kinetic model approach

机译：L（+）-抗坏血酸中维生素C的连续大量结晶-乙醇-水系统：尺寸无关的生长动力学模型方法

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

Experimental results concerning continuous isohydrical drowning-out mass crystallization of vitamin C in an L(+)-ascorbic acid - ethanol - water system are presented. The process environment was created in a laboratory-scale draft tube, mixed suspension mixed product removal (DT MSMPR) crystallizer with internal circulation of suspension. Assuming a constant feed concentration of ethanol (20 mass %), the feed concentration ofvitamin C was changed within the 30-50 mass % range. The mean residence time of suspension in working volume of a crystallizer was varied from 900 to 3600 s. Combinations of the presented above input process parameters resulted in a productivity 244-1692 kg/(m~3 h) of crystal product, of mean size within 0.20-0.24 mm and of CV within the 50-60% range. The supersaturation level in mother solution reached relatively high values (up to ca. 6.5 mass %), in particular at a short mean residence time of suspension (900 s). With this time elongation to 3600 s, the supersaturation level decreased, however, by ca. 40% (to 3.9 mass %). The simplest size-independent growth (SIG) kinetic model was adopted for nucleation ((3.3-27.8) × 10~7 1/(s m~3)) and crystal growth ((1.6-6.9) × 10~(-8) m/s) rates estimation. Kinetic relations and feedback between nucleation and crystals growth were identified and analyzed in detail.
机译：提出了关于在L（+）-抗坏血酸-乙醇-水系统中维生素C连续等水淹没的大量结晶的实验结果。在实验室规模的引流管，混合悬浮液混合产品去除（DT MSMPR）结晶器和悬浮液内部循环中创建了工艺环境。假设乙醇的进料浓度恒定（20质量％），则维生素C的进料浓度在30〜50质量％的范围内变化。悬浮液在结晶器工作体积中的平均停留时间为900到3600 s。上述输入工艺参数的组合产生了晶体产品的生产率为244-1692 kg /（m〜3 h），平均尺寸在0.20-0.24 mm之内，CV在50-60％的范围内。母液中的过饱和度达到相对较高的值（最高约6.5质量％），特别是在悬浮液的平均停留时间较短（900 s）时。随着这个时间延长到3600 s，过饱和度降低了大约。 40％（至3.9质量％）。采用最简单的尺寸独立生长（SIG）动力学模型进行成核（（3.3-27.8）×10〜7 1 /（sm〜3））和晶体生长（（1.6-6.9）×10〜（-8）m / s）费率估算。动力学关系和成核与晶体生长之间的反馈被识别和详细分析。

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