Variable volume flow reactor

A continuous flow reactor comprising:

• a. a chassis for a continuous flow reactor comprising a plurality of channels on a surface of the chassis arranged in a double spiral configuration, each operable to accept a plurality of lengths of reactor tubing, wherein the plurality of channels comprises:
• i. a primary channel comprising a first end at a side of the chassis, a second end at a side of the chassis, a first spiral channel connected to the first end, and a second spiral channel connected to the second end, wherein the first spiral channel and the second spiral channel are interleaved and connect at a center of the double spiral to form the primary channel extending from the first end to the second end, wherein the primary channel defines a first reactor tubing path comprising an inlet and an outlet;
• and
• ii. a secondary channel comprising a first cross-channel extending from a first cross-channel end at a side of the chassis to a connection point within the first spiral channel, and a second cross-channel extending from a second cross-channel end at a side of the chassis to a connection point within the second spiral channel, wherein the second channel defines a second reactor tubing path comprising an inlet and an outlet;
• b. reactor tubing installed in a channel of the chassis;
• and
• c. optionally a cover for partially and completely covering the chassis and the reactor tubing.