Endoscopy is a widely used diagnostic tool to detect reflux esophagitis.Although its specificity was reported to be excellent at 90%-95%,its sensitivity was only 50%.Therefore,it is quite difficult to detect these les...Endoscopy is a widely used diagnostic tool to detect reflux esophagitis.Although its specificity was reported to be excellent at 90%-95%,its sensitivity was only 50%.Therefore,it is quite difficult to detect these lesions under the standard white light endoscopy especially in patients with minimal change esophageal reflux disease(MERD).In recent years,endoscopic technologies have evolved tremendously;these include high resolution and magnification digital chromoendoscopy.These technologies are useful practically for detecting various subtle lesions along the gastrointestinal tract starting from esophagus to colon.Currently,these technologies can be classified in 2 systems;pre-processed system(NBI,Olympus)and post processed system(FICE and i-SCAN,Fujinon and Pentax respectively).Over a few years,there have been many emerging publications on the benefit of these systems on MERD detection.The overall sensitivities to diagnose MERD were reported as much better than controls.However,large,multi-center and randomized controlled studies comparing these new imaging modalities with the conventional white light chromoendoscopy are warranted to validate its accuracy.Standard,simple and precise endoscopic reading criteria for the identification of MERD are also required.展开更多
基于Aspen Plus V12软件,建立了某工厂合成高纯MTBE装置全过程稳态模型,模型运算结果与装置生产运行参数匹配良好。在此基础上,综合考虑了醇烯比、回流比等关键工艺参数对系统的影响,预测出较优的工艺参数:醇烯比是1.04,催化精馏塔回流...基于Aspen Plus V12软件,建立了某工厂合成高纯MTBE装置全过程稳态模型,模型运算结果与装置生产运行参数匹配良好。在此基础上,综合考虑了醇烯比、回流比等关键工艺参数对系统的影响,预测出较优的工艺参数:醇烯比是1.04,催化精馏塔回流比是1.5,萃取吸收塔溶剂比是0.05,甲醇回收塔回流比是2.5,产品脱重塔回流比是0.9。经过工艺参数优化,高纯MTBE产品质量分数达到99.62%,MTBE回收率达到91.69%,异丁烯转化率达到99.66%,催化精馏塔、甲醇回收塔以及产品脱重塔塔底总热负荷降低7.68%。展开更多
文摘Endoscopy is a widely used diagnostic tool to detect reflux esophagitis.Although its specificity was reported to be excellent at 90%-95%,its sensitivity was only 50%.Therefore,it is quite difficult to detect these lesions under the standard white light endoscopy especially in patients with minimal change esophageal reflux disease(MERD).In recent years,endoscopic technologies have evolved tremendously;these include high resolution and magnification digital chromoendoscopy.These technologies are useful practically for detecting various subtle lesions along the gastrointestinal tract starting from esophagus to colon.Currently,these technologies can be classified in 2 systems;pre-processed system(NBI,Olympus)and post processed system(FICE and i-SCAN,Fujinon and Pentax respectively).Over a few years,there have been many emerging publications on the benefit of these systems on MERD detection.The overall sensitivities to diagnose MERD were reported as much better than controls.However,large,multi-center and randomized controlled studies comparing these new imaging modalities with the conventional white light chromoendoscopy are warranted to validate its accuracy.Standard,simple and precise endoscopic reading criteria for the identification of MERD are also required.
文摘基于Aspen Plus V12软件,建立了某工厂合成高纯MTBE装置全过程稳态模型,模型运算结果与装置生产运行参数匹配良好。在此基础上,综合考虑了醇烯比、回流比等关键工艺参数对系统的影响,预测出较优的工艺参数:醇烯比是1.04,催化精馏塔回流比是1.5,萃取吸收塔溶剂比是0.05,甲醇回收塔回流比是2.5,产品脱重塔回流比是0.9。经过工艺参数优化,高纯MTBE产品质量分数达到99.62%,MTBE回收率达到91.69%,异丁烯转化率达到99.66%,催化精馏塔、甲醇回收塔以及产品脱重塔塔底总热负荷降低7.68%。
