以乙醇为介质气体扩散法分离碳同位素的可行性研究

The Feasibility Study of Separating Carbon Isotope by Gas Diffusion Method Using Ethanol as Processing Gas

碳-13作为同位素示踪技术的标记物,应用广泛,市场需求呈上升趋势。为探索碳-13同位素的分离方法,开展以乙醇为介质的气体扩散分离实验,并在单级实验的基础上进行级联计算。单级分离实验的结果表明,在现有的实验条件下,气体扩散法分离乙醇的基本全分离系数可达1.0089,以乙醇为介质扩散分离碳同位素可行。通过级联计算可知,以天然乙醇为原料,结合分离的可行性和经济性,经过一次矩形级联或相对丰度匹配级联分离,能够得到碳-13同位素丰度大于25%的重组分。如能将碳-13同位素丰度大于25%的乙醇转化为合适形态的碳化合物,可再进一步分离得到更高丰度的碳-13同位素。

As a marker for isotope tracing technology,carbon-13 is widely used and the market demand is on the rise.In order to explore the separation method of carbon-13 isotope,a gas diffusion separation experiment using ethanol as the processing gas was carried out,and a cascade calculation was carried out on the basis of the single-stage experiment.The results of the single-stage separation experiment show that the overall separation factor for unit mass difference of ethanol separation by gas diffusion can reach 1.0089 under the existing experimental conditions.It is feasible to use ethanol as processing gas to separate carbon isotopes by gas diffusion method.Through the cascade calculation,it can be known that using natural ethanol as the feed,combined with the feasibility and economy of separation,after a square cascade or matched abundance ratio cascade separation,a heavy fraction with the carbon-13 isotope abundance greater than 25%can be obtained.If ethanol with a carbon-13 isotope abundance greater than 25%can be converted into a suitable form of carbon compound,it can be further separated to obtain a higher abundance of carbon-13 isotope.