改性乙醇胺富集烟道气中CO_2的FTIR研究

以四(3,5-二叔丁基-4-羟基苯基丙酸)季戊四醇酯(抗氧剂1010)、Na2SO3作为乙醇胺(MEA)的氧化降解的改性剂,考察改性MEA富集模拟烟道气中CO2的效果,利用气相色谱、红外光谱分析抗氧剂1010与Na2SO3的适宜用量、比较两种抗氧剂的抗氧化性能。结果表明,抗氧剂1010和亚硫酸钠的添加量在0.15%时效果均较好。红外光谱显示,其再生样品中存在酰胺的C O吸收峰,酰胺在碱性溶液中转变成伯胺,有利于MEA溶剂富集CO2;1010/20%MEA溶液的氧化产物为羧酸,Na2SO3/20%MEA溶液的氧化产物为酰胺,酰胺有利于溶液吸收CO2,Na2SO3的抗氧化性能优于抗氧剂1010。添加抗氧剂后的有机胺的氧化降解程度降低,胺溶液的再生能力显著提高。

Exacerbation of inflammatory bowel disease by nonsteroidal anti-inflammatory drugs and cyclooxygenase-2 inhibitors:Fact or fiction?

The existence of a possible link between inflammatory bowel disease （IBD） and nonsteroidal anti-inflammatory drugs （NSAIDs） has been repeatedly suggested. Recently, a few studies have addressed the issue of a possible, similar effect by selective cyclooxygenase-2 inhibitors （COXIBs）. The present article reviews the available scientific evidence for this controversial subject.