Abstract: A system for pressurising parallel batch reactors, and a process for using such to pressurize batch reactors to a pressure of between 20 and 150 barg. The reactors are closed by a removable reactor closure system for covering the mouth of such reactor, wherein the closure system comprises an elastomeric septum and a rigid member with a small hole covering the septum. The septum may be pierced with a specific hollow needle, e.g. to force pressurized gas in the reactor, which pressure can be maintained for prolonged periods after withdrawing the needle. The closure system does not require moving parts.

Abstract: The present invention provides a system, comprising at least one reactor array, comprising at least two reactor vessels (2) a connecting member for fixating the at least two reactor vessels relative to each other (4, 5) at least one reactor block (18) comprising a heating block (20) for heating the reactor vessels (2) the heating block (20) comprising at least two reactor channels for receiving the at least two reactor vessels (2) wherein the heating block (20) is constructed of a material having a thermal expansion coefficient <=1×10e?5 K-I (at 293K). In an embodiment the heating block is substantially entirely constructed of graphite.