US 2025/0001352 A1Published application

Pressure swing adsorption apparatus for high purity hydrogen purification from ammonia decomposition and hydrogen purification method using the same

AssigneeKorea Institute of Energy Research

InventorsSang-sup HAN, Hyung-chul YOON, Hee-tae BEUM, Kanghee CHO, Sun Hyung KIM, Hyung Kuk JU, Jae Hyung KIM, Kyungho LEE, Jong-ho PARK, Jong-nam KIM

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Abstract

The present disclosure relates to a pressure swing adsorption apparatus for high purity hydrogen purification from ammonia decomposition and a hydrogen purification method using the same, and more specifically, the pressure swing adsorption apparatus includes a plurality of adsorption towers including a guard bed unit and a hydrogen purification unit, in which each adsorption tower is packed with different adsorbents, to purify high purity hydrogen from mixed hydrogen gas produced after ammonia decomposition, make it easy to replace the adsorbent for ammonia removal, minimize the likelihood that the lifetime of the adsorbent in the hydrogen purification unit is drastically reduced by trace amounts of ammonia, efficiently recover hydrogen of the guard bed unit, thereby maximizing the hydrogen recovery rate compared to a conventional pressure swing adsorption process including a pretreatment unit and a hydrogen purification unit, and respond to a large change in ammonia concentration in the raw material.

Claims15

Dependent claims

A pressure swing adsorption apparatus for hydrogen purification from ammonia decomposition, comprising:

a plurality of adsorption towers including a guard bed unit and a hydrogen purification unit, connected to a raw material feed pipe;
a vacuum pump connected to the adsorption towers to keep the adsorption towers in a vacuum state;
and a plurality of valves to open/close a plurality of pipes connected to the adsorption towers and the vacuum pump,
wherein the guard bed unit is disposed on bottom of the hydrogen purification unit, and the adsorption tower in the guard bed unit is packed with a first adsorbent and a second adsorbent in a multilayer structure to selectively adsorb and remove moisture and ammonia included in mixed hydrogen gas produced after ammonia decomposition fed through the raw material feed pipe, and
wherein the hydrogen purification unit is disposed on top of the guard bed unit, and the adsorption tower in the hydrogen purification unit is packed with a third adsorbent to selectively adsorb and remove nitrogen included in the mixed hydrogen gas free of moisture and ammonia from the guard bed unit.

2 more elements

Dependencies are inferred from the claim text.