Microwave pyrolysis reacto

A microwave pyrolysis reactor comprising an inner pipe element and a housing, wherein

• the inner pipe element is made of a microwave transparent material and is arranged within the housing and comprises a first open end and a second open end;
• the housing comprises a first inner surface, enclosing an annular space around the inner pipe element, a waste inlet, a solids outlet, a gas outlet, and a port for a microwave waveguide, the waste inlet and the solids outlet are in communication with the first open end and the second open end of the inner pipe element, respectively, the port for a microwave waveguide is in communication with the annular space;
• the inner pipe element, the waste inlet and the solids outlet form parts of a conduit not in fluid communication with the annular space around the inner pipe element and
• wherein the inner pipe element is clamped within the housing, by compressive forces acting in the longitudinal direction of the pipe element, via a cylinder-shaped resilient assembly arranged at at least one of the first open end and the second open end of the inner pipe element, the resilient assembly is adapted to allow longitudinal expansion of the inner pipe element and comprises a central through-going passage having a centerline collinear with a centerline of the inner pipe element, at least one spring element having a first end and a second end, and a fluid-tight annular wall, wherein the spring element is compressible in a direction parallel to a centerline of the inner pipe element.