臺灣博碩士論文加值系統

以醇胺水溶液為吸收劑,將酸性氣體雜質如二氧化碳,硫化氫做有效的處
理,是最常用的氣體處理程序。因醇胺有下列優點:良好的反應性,廉價,蒸
氣壓較低與易於氣提再生。工業上常使用單一醇胺水溶液為吸收劑。然而
一級,二級醇胺對於二氧化碳有高吸收反應速率而有低吸收容量之缺點;三
級醇胺對於二氧化碳有高吸收容量而有低吸收反應速率之缺點。近年來有
學者提出混合醇胺的建議,其目的在於結合各醇胺之特性,以發展出具有高
吸收速率,高吸收容量,良好的吸收及氣提特點之吸收液。本研究即朝此方
向來探討以MEA/PE混合醇胺水溶液做為酸性氣體二氧化碳,硫化氫之吸收
液所需的氣液平衡溶解度數據,此數據為設計與操作酸性氣體程序中吸收
塔及氣提塔之重要依據。本研究的研究成果如下: (一).氣液平衡溶解度
之測量 (1).二氧化碳在混合醇胺(MEA/PE)水溶液中之溶解度在本研究中
所探討的醇胺組成分別為30 wt%MEA,24 wt%MEA + 6 wt% PE,12 wt%MEA
+ 18 wt%PE,30 wt%PE。溫度範圍為40,60,80,100°C。二氧化碳分壓範圍
為0.1到200 kPa。 (2).硫化氫在混合醇胺(MEA/PE)水溶液中之溶解度在
本研究中所探討的醇胺組成分別為30 wt%MEA,24 wt%MEA + 6 wt% PE,12
wt%MEA + 18 wt%PE,30 wt%PE。溫度範圍為40,60,80,100°C。硫化氫分
壓範圍為1到1500 kPa。 (二).氣液平衡熱力學模式的建立在本研究中建
立一半經驗式的熱力學模式來描述硫化氫在MEA/PE混合醇胺水溶液系統與
二氧化碳在MEA/PE混合醇胺水溶液系統中的氣液平衡溶解度,此模式亦可
做為內插實驗數據之工具。

Alkanolamines are extensively used as absorbents for removal of
acid gas impurties such as H2S, CO2. The conventionally used
alkanolamines are MEA(monoethanolamine), DEA(diethanolamine),
TEA(triethanolamine), MDEA(methyl-diethanolamine) and
sterically hindered amines such as AMP(2-amino-2-methyl-1-
propanol) and PE(2-piperidine ethanol). In industrial gas
treating processes, single-amine aqueous solutions are
frequently used as absorbents. Recently, the use of blended
amines solutions was proposed for removal of acidic gases. It
is the purpose to retain the advantages of each amine such as
high absorption rates and high absorption capacities and to
develop the more effective absorbents.Because the equilibrium
solubilities of acid gases in alkanolamines are important for
the rational design of absorbers and strippers. It is the
purpose of this reseach to study the vapor liquid eqilibrium
behaviour of H2S and CO2 in blended amines MEA/PE/H2O system.
The solubilities of H2S and CO2 in aqueous mixtures of MEA and
PE have been measured at 40, 60, 80, and 100°C. The blended
amines studied are 30 wt%MEA , 24 wt%MEA + 6 wt%PE, 12 wt%MEA +
18 wt%PE, and 30 wt%PE. The partial pressures are from 1.0 kPa
to 1500kPa and from 0.1kPa to 200kPa for H2S and CO2,
respectively. A semi-empirical thermodynamic model has also
been developed to correlate the experimental data.