Fluid reactor

A reactor for reacting a fluid with a gas, the reactor comprising:

• two first vessels, each first vessel comprising a gas inlet;
• and
• two second vessels,
• wherein one of the second vessels is situated between the two first vessels such that the said one of the second vessels is in direct contact with each first vessel, and at least one of the first vessels is situated between the two second vessels such that the said at least one of the first vessels is in direct contact with each of the two second vessels, wherein the direct contact facilitates heat exchange between the vessels, and
• wherein each of the first vessels and each of the second vessels comprise an aperture, wherein:
• the aperture of each first vessel connects each first vessel with at least one second vessel,
• the aperture of each second vessel is situated at the bottom of each second vessel,
• the apertures of the first vessels are situated above the apertures of the second vessels, and
• the apertures are arranged in a series,
• such that fluid in the first vessels is directed to flow towards and through the aperture of each first vessel and into a connected second vessel by gas entering each first vessel through the gas inlet, and the apertures of the second vessels allow the fluid flowing from each first vessel and through each second vessel to flow into a first vessel connected to the second vessel.