Method and device for separating hydrogen sulfide and hydrogen production system using the same

A device for selectively separating hydrogen sulfide from a gas to be treated containing hydrogen sulfide and carbon dioxide using a hydrogen sulfide adsorbent in which an amine compound is supported by a porous material, the device comprising:

• an adsorbent-packed tower filled with the hydrogen sulfide adsorbent;
• means for supplying the gas to be treated to the adsorbent-packed tower to bring the hydrogen sulfide adsorbent and the gas to be treated into contact with each other;
• and
• means for supplying a heated gas flow for desorbing hydrogen sulfide from the hydrogen sulfide adsorbent after adsorption of hydrogen sulfide to the adsorbent-packed tower,
• wherein the amine compound is a tertiary amine, and the contact between the hydrogen sulfide adsorbent and the gas to be treated in the adsorbent-packed tower is made in a dry state.

A device for selectively separating hydrogen sulfide from a gas to be treated containing hydrogen sulfide and carbon dioxide using a hydrogen sulfide adsorbent in which an amine compound is supported by a porous material, the device comprising:

• a plurality of adsorbent-packed towers filled with the hydrogen sulfide adsorbent;
• a plurality of means for supplying the gas to be treated to the adsorbent-packed towers, respectively, to bring the hydrogen sulfide adsorbent and the gas to be treated into contact with each other;
• and
• a plurality of means for supplying a heated gas flow for desorbing hydrogen sulfide from the hydrogen sulfide adsorbent after adsorption of hydrogen sulfide to the adsorbent-packed towers, respectively,
• wherein the amine compound is a tertiary amine, and the contact between the hydrogen sulfide adsorbent and the gas to be treated in each of the adsorbent-packed towers is made in a dry state, and
• wherein the gas to be treated is supplied from the gas supplying means to one or more of the adsorbent-packed towers, respectively, to selectively adsorb hydrogen sulfide, and the heated gas flow is supplied from the heated gas flow supplying means to another of the adsorbent-packed towers or one or more of the other adsorbent-packed towers, respectively, to desorb hydrogen sulfide.

A system for producing hydrogen from a raw material gas that is a gas to be treated containing hydrogen sulfide, carbon dioxide, and hydrogen, the system comprising:

• the hydrogen sulfide separation device according to claim that selectively separates hydrogen sulfide from the raw material gas;
• a carbon dioxide separation device that is provided downstream of the hydrogen sulfide separation device to separate carbon dioxide from a gas obtained by removing hydrogen sulfide from the raw material gas;
• and
• a hydrogen purification device that is provided downstream of the carbon dioxide separation device to separate hydrogen from a gas obtained by removing hydrogen sulfide and carbon dioxide from the raw material gas.

A system for producing hydrogen from a raw material gas that is a gas to be treated containing hydrogen sulfide, carbon dioxide, and hydrogen, the system comprising:

• the hydrogen sulfide separation device according to claim that selectively separates hydrogen sulfide from the raw material gas;
• a carbon dioxide separation device that is provided downstream of the hydrogen sulfide separation device to separate carbon dioxide from a gas obtained by removing hydrogen sulfide from the raw material gas;
• and
• a hydrogen purification device that is provided downstream of the carbon dioxide separation device to separate hydrogen from a gas obtained by removing hydrogen sulfide and carbon dioxide from the raw material gas.