Purification of hydrogen

An apparatus for purifying a raw hydrogen gas stream, the apparatus comprising:

• a first adsorption unit having a first activated carbon disposed within the first adsorption unit, wherein the first activated carbon is configured to adsorb a first impurity from the raw hydrogen gas stream on a surface of the first activated carbon bed;
• and
• a second adsorption unit in fluid communication with an outlet of the first adsorption unit, the second adsorption unit having a second activated carbon disposed within the second adsorption unit, wherein the second activated carbon is configured to adsorb a second impurity on a surface of the second activated carbon bed,
• wherein the second activated carbon comprises a reducing agent impregnated on a surface of the second activated carbon.

An apparatus for purifying a raw hydrogen gas stream, the apparatus comprising:

• a first adsorption unit having a first activated carbon disposed within the first adsorption unit, wherein the first activated carbon is configured to adsorb a first impurity from the raw hydrogen gas stream on a surface of the first activated carbon bed;
• and
• a second adsorption unit in fluid communication with an outlet of the first adsorption unit, the second adsorption unit having a second activated carbon disposed within the second adsorption unit, wherein the second activated carbon is configured to adsorb a second impurity on a surface of the second activated carbon bed,
• wherein the first impurity is chlorine, wherein the second impurity is chloramine or a mixture of chloramines.

A method for purifying a raw hydrogen gas stream, the method comprising the steps of:

• a) removing a first impurity from the raw hydrogen gas stream using a first activated carbon bed to produce a partially pure hydrogen stream;
• and
• b) removing a second impurity from the partially pure hydrogen stream using a second activated carbon bed to produce a purified hydrogen stream;
• wherein the first activated carbon bed comprises a first activated carbon that is configured to adsorb the first impurity on a surface of the first activated carbon bed,
• wherein the second activated carbon bed comprises a second activated carbon that is configured to adsorb the second impurity on a surface of the second activated carbon bed,
• wherein the raw hydrogen gas stream is sourced from a chlorine production facility.

A method for purifying a raw hydrogen gas stream, the method comprising the steps of:

• providing the raw hydrogen gas stream, wherein the raw hydrogen gas stream includes impurities comprising chloramines and chlorine;
• removing the impurities of chloramines and chlorine from the raw hydrogen gas stream to produce a purified hydrogen gas;
• and
• liquefying the purified hydrogen gas to produce liquid hydrogen;
• wherein the step of removing the impurities of chloramines and chlorine from the raw hydrogen gas stream to produce a purified hydrogen gas includes the steps of:
• adsorbing the chloramines on a surface of a first activated carbon and decomposing the chloramines to non-reactive products;
• and
• adsorbing the chlorine on a surface of a second activated carbon and reacting the chlorine with a reducing agent disposed on the surface of the second activated carbon.