Method and apparatus for drying and purifying a fluid containing carbon dioxide and water

A method for drying and purifying a fluid at a first temperature containing between 10 and 50 mol % of carbon dioxide and also at least one impurity lighter than carbon dioxide chosen from the list:

• oxygen, nitrogen, argon, carbon monoxide, methane, helium and hydrogen, and also water, comprising:
• a) cooling the fluid at the first temperature to a second temperature against water at a third temperature lower than the first temperature and partially condensing the water contained in the fluid, the cooling water heating up to a fourth temperature,
• b) separating the condensed water to obtain a partially dried fluid at the second temperature,
• c) drying the partially dried fluid at the second temperature by passing through an adsorbent to obtain a dried fluid at a fifth temperature,
• d) heating up the dried fluid at the fifth temperature against water which cools to obtain water at a sixth temperature and a dried fluid at a seventh temperature,
• e) cooling the water at the sixth temperature by heat exchange with a cold-energy source at an eighth temperature colder than the sixth temperature, generating water at the third temperature, and
• f) using the water generated at the third temperature during step e) to cool the fluid at the first temperature during step a).