Novel Process Windows – Gate to Maximizing Process Intensification via Flow Chemistry

Chemical Engineering and Technology - Tập 32 Số 11 - Trang 1655-1681 - 2009
Volker Hessel1,2,3
1Chemical Milli- and Micro-process Technologies, Institut für Mikrotechnik Mainz GmbH, Mainz, Germany
2Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
3Technical Chemistry, Department of Chemistry, Technische Universität Darmstadt, Darmstadt, Germany

Tóm tắt

AbstractDriven by the economics of scale, the size of reaction vessels as the major processing apparatus of the chemical industry has became bigger and bigger [1, 2]. Consequently, the efforts for ensuring mixing and heat transfer have also increased, as these are scale dependent. This has brought vessel operation to (partly severe) technical limits, especially when controlling harsh conditions, e.g., due to large heat releases. Accordingly, processing at a very large scale has resulted in taming of the chemistry involved in order to slow it down to a technically controllable level. Therefore, reaction paths that already turned out too aggressive at the laboratory scale are automatically excluded for later scale‐up, which constitutes a common everyday confinement in exploiting chemical transformations. Organic chemists are barely conscious that even the small‐scale laboratory protocols in their textbooks contain many slow, disciplined chemical reactions. Operations such as adding a reactant drop by drop in a large diluted solvent volume have become second nature, but are not intrinsic to the good engineering of chemical reactions. These are intrinsic to the chemical apparatus used in the past. In contrast, today's process intensification [3–12] and the new flow‐chemistry reactors on the micro‐ and milli‐scale [13–39] allow such limitations to be overcome, and thus, enable a complete, ab‐initio type rethinking of the processes themselves. In this way, space‐time yields and the productivity of the reactor can be increased by orders of magnitude and other dramatic performance step changes can be achieved. A hand‐in‐hand design of the reactors and process re‐thinking is required to enable chemistry rather than subduing chemistry around the reactor [40]. This often leads to making use of process conditions far from conventional practice, under harsh environments, a procedure named here as Novel Process Windows.

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Chemical Engineering and Technology

Tập 32 Số 11

1655-1681

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