热扩散塔分离甲烷和氢的实验研究

引言用甲烷直接合成C_2以上的碳氢化合物非常困难，例如，由甲烷脱氢合成乙烯，按热力学计算在1000K下甲烷的平衡转化率只有4.8％，所以至今甲烷仍主要用作燃料．为了充分利用这一化工基础原料，作者利用热扩散塔进行了甲烷的催化脱氢反应，使反应与分离同时进行，大幅度提高了甲烷的转化率．为考察热扩散的分离效果，本文用甲烷脱氢反应的主要成分甲烷和氢混合物为原料，在热扩散塔中分别进行了空塔和填料塔的热扩散分离实验，考察了一些操作参数对分离效果的影响，以期对反应操作条件提供必要的参考．l原理所谓热扩散现象，就是在温度场…

EXPERIMENTAL STUDY ON SEPARATION OF METHANE AND HYDROGEN BY THERMAL DIFFUSION COLUMN

The separation experiments of CH_4 and H_2 was carried out in a thermal diffusion column with and without packing.In the case of no packing added,the separation was affected by heating temperature,β（cut),and residence time.The temperature gradient is the driving force of the thermal diffusion separation. The separation degree was increased with increasing of heating temperature,and it was affected by βsharply.Under the conditions of higher heating temperature,the optimum separation was obtained with the β value which was close to the mole fraction of hydrogen in the feed.The separation degree was also affected by the residence time.In the case of packing column,the separation degree was higher for the packing with larger size.However,it was still lower than the no packing one.It was greatly improved by using mesh type packing.