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Separation of hydrogen from the gas mixture out of catalytic reformer yhb using supported palladium membrane

机译：使用负载钯膜从催化重整器yhb中分离混合气中的氢气

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This paper presents a technology for producing high purity hydrogen by using supported palladium (Pd) membrane. The membrane is prepared by electroless plating and is stable among 300-400deg C. The membrane shows high permselectivity in range of 200-1400 for H_2/N_2 andhydrogen permeance of 3-7 m~3/m~2-h-atm. A mathematical model describing separation behaviour of membrane tube is used to predict the permeation parameters. Accordingly, the hydorgen flux and recovery yield can be calculated as the hydrogen is recovered from the recycle gas of catalytic reformer in refinery operation. A self-heating hydrogen separator containing ten membrane tubes was field-tested for the separation and purification of hydrogen. the supported Pd membranes show very good stability under the real environment of the gas mixture out of catalytic reformer. the total time on stream for the operation was more than 1000 h. The permeated hydrogen flux mainly depends on the pressure and flow rate of feedstock. The higher the pressure and feeding rate, the higher the hydrogen flux. However, the recovery yield of hydrogen decreased with increasing fedding rate. For instance, at the load-to-surface ratio of 4 m~3/h-m~2, a recovery yield of near 90% could be obtained. As the ratio increased to 8 m~3/h-m~2, the recovery yeield decreased to about 70%. The purity of hydrogen can be raised from around 82 to 99.6% or above, which is apparently higher than those separated by polymeric membranes.
机译：本文提出了一种利用负载的钯（Pd）膜生产高纯度氢气的技术。该膜是通过化学镀制备的，在300-400℃之间稳定。该膜对H_2 / N_2的透磁选择性高，在200-1400的范围内，氢渗透率为3-7m〜3 / m〜2-h-atm。描述膜管分离行为的数学模型用于预测渗透参数。因此，当在炼油厂操作中从催化重整器的再循环气体中回收氢时，可以计算出氢通量和回收率。对包含十个膜管的自热式氢气分离器进行了现场测试，以分离和纯化氢气。负载的钯膜在催化重整器流出的混合气体的真实环境下显示出非常好的稳定性。该操作的总运行时间超过1000小时。渗透的氢通量主要取决于原料的压力和流速。压力和进料速率越高，氢通量越高。但是，氢气的回收率随加料速度的增加而降低。例如，在负载与表面的比率为4 m〜3 / h-m〜2的情况下，可以获得接近90％的回收率。随着比率增加到8 m〜3 / h-m〜2，回收率下降到大约70％。氢气的纯度可以从约82％提高到99.6％或更高，这显然比被聚合物膜分离的纯度更高。

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