Selective separation of CO2 by using novel facilitated transport membrane at elevated temperatures and pressures
Selective separation of CO2 by using novel facilitated transport membrane at elevated temperatures and pressures
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DOI：
10.1016/j.memsci.2007.01.011
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发表时间：
2007-03
影响因子：
9.5
通讯作者：
R. Yegani;H. Hirozawa;M. Teramoto;H. Himei;O. Okada;T. Takigawa;N. Ohmura;Norifumi Matsumiya;H. Matsuyama
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文献类型：
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作者：
R. Yegani;H. Hirozawa;M. Teramoto;H. Himei;O. Okada;T. Takigawa;N. Ohmura;Norifumi Matsumiya;H. Matsuyama
以2，3-二氨基丙酸（达帕）为CO2选择性载体，PVA/PAA凝胶为支撑体，研制了一种新型的促进传递膜，用于制氢装置水煤气变换反应器中CO2的脱除。在125 ~ 160°C、100 ~ 650 kPa的原料气压力下，对CO_23.65%CO_2，N_232.9%N_2，H_2O 63.5%H_2O的混合气体进行了选择性分离实验，考察了膜的性能。在125°C和300 kPa下，典型的CO2渗透率为3.14×10− 4 mol/m2 skPa，在140°C下为1.71×10− 4，在160°C和600 kPa下，原料气压力为450 kPa和1.10×10− 4，在相应条件下的CO2/H2选择性分别为1070、561和432。结果表明，膜中的水含量是决定CO2渗透率和CO2/N2选择性的关键因素之一。随着压力的增加，膜的CO2渗透率和CO2/N2选择性均增加，这可能主要是由于膜中水含量的增加所致。还发现，增加载体浓度可以显著提高膜性能，特别是在升高的温度下。
A novel facilitated transport membrane consisting of 2,3-diaminopropionic acid (DAPA) as a selective carrier of CO2and PVA/PAA gel as support was developed for the removal of CO2from the water gas shift reactor in the hydrogen production plants. The membrane performance was tested by the experiments on the selective separation of CO2from a mixture of 3.65% CO2, 32.9% N2and 63.5% H2O at the temperature from 125 to 160°C and the feed gas pressure from 100 to 650kPa. Typical observed CO2permeances were 3.14×10−4mol/m2skPa at 125°C and 300kPa, 1.71×10−4at 140°C and the feed gas pressure of 450kPa and 1.10×10−4at 160°C and 600kPa, and the CO2/H2selectivities at the respective conditions were 1070, 561 and 432, respectively. Obtained results showed that the water content in the membrane is one of the key factors, which determines the CO2permeance and CO2/N2selectivity. The CO2permeance as well as the CO2/N2selectivity increased with increasing the pressure, which might be mainly caused by increasing the water content in the membrane. It was also found that increasing the carrier concentration could significantly enhance the membrane performance, especially at elevated temperatures.