Method and apparatus for in situ product recovery

An apparatus, comprising:

• a reactor, comprising a first reactor vessel, a substrate supply, a first outlet and a second outlet,
• a filtration unit comprising a first membrane having a first surface communicating with the first reactor vessel and a second surface, opposite the first surface, communicating with the first outlet, and
• a liquid-liquid or liquid-gas extraction unit comprising a second membrane having a third surface communicating with the first reactor vessel and a fourth surface, opposite the third surface, communicating with the second outlet,
• wherein the first membrane and the second membrane are arranged inside the first reactor vessel, and
• wherein the first membrane and the second membrane are arranged to move relative to the first reactor vessel.