Patent ID: 7713332

Claim:
A carbon dioxide separation system for a fuel cell system, comprising: a separation device for containing a fluid phase, a carbon dioxide phase, and a two phase fluid including fluid and carbon dioxide, said separation device comprising a two phase fluid inlet, a fluid outlet, a carbon dioxide outlet, a carbon dioxide separation membrane, and a flow restrictor for creating a backpressure which presses separated carbon dioxide through the carbon dioxide separation membrane; wherein the flow restrictor is mounted downstream of the separation device and comprises at least one narrow aperture; and wherein the carbon dioxide separation membrane is positioned in the separation device in such a manner that at least a part of a total membrane area is arranged above a two phase fluid level and is in touch with carbon dioxide contained in the separation device above the two phase fluid level; said carbon dioxide separation system further comprising a mixer, wherein the separation device is attached to the mixer as two compartments in one unit, separated by a diaphragm; and wherein the flow restrictor is a capillary integrated in the diaphragm.