Reaction jacket for a photosynthetic reactor and related photosynthetic reactor

A reaction jacket for a photosynthetic reactor adapted for growing photosynthetic microorganisms, said reaction jacket configured to float on an expanse of water and comprising a first and a second openings, said reaction jacket delimiting a reaction channel for channeling a gas/liquid culture medium two-phase flow path between the first and second openings of said reaction jacket, said reaction jacket comprising two sheaths, outer and inner, respectively, made at least partially from a material transparent to light radiation, the inner sheath extending to an inside of the outer sheath such that said sheaths define an inter-sheath space between them in fluid connection with the first opening of the reaction jacket, wherein the outer sheath has an open proximal end and a closed distal end, and the inner sheath has an open proximal end in fluid connection with the second opening of the reaction jacket and a distal end provided with at least one communication orifice between the inside of the inner sheath and the inter-sheath space, the two sheaths delimiting said reaction channel forming a round trip journey between said first and second openings, inside the inter-sheath space and inside the inner sheath via the communication orifice formed at the distal end of the inner sheath

• wherein said reaction jacket further comprising:
• an outer connecting piece on which the proximal end of the outer sheath is hermetically mounted, and on which the first opening of the reaction jacket is formed in fluid connection with the inter-sheath space;
• and
• an inner connecting piece on which the proximal end of the inner sheath is hermetically mounted, and on which the second opening of the reaction jacket is formed in fluid connection with the proximal end of the inner sheath.