What is a plug flow reactor used for?

The plug flow reactor model (PFR, sometimes called continuous tubular reactor, CTR, or piston flow reactors) is a model used to describe chemical reactions in continuous, flowing systems of cylindrical geometry.

Where are plug flow reactors used?

Usage Examples. Plug flow reactors have a wide variety of applications in either gas or liquid phase systems. Common industrial uses of tubular reactors are in gasoline production, oil cracking, synthesis of ammonia from its elements, and the oxidation of sulfur dioxide to sulfur trioxide.

When would you use a plug flow reactor?

Currently, plug flow reactors are used in the production of biodiesel and other biofuels with a recycle system [9]. The plug flow reactor is mostly preferred for bioenergy production because of its steady-state operation. In addition, the plug flow reactor does not require any agitation or baffling.

What is an ideal plug flow reactor?

Plug Flow Reactor (PFR) The third general type of reactor is the Plug Flow Reactor (PFR). In an ideal plug flow reactor, it is assumed that there is no mixing of the medium along the long axis (X-axis) of the reactor although there may be lateral mixing in the medium at any point along the long axis (ie the Y-axis).

How does plug flow reactor works?

Fluid going through a plug flow reactor is modeled as flowing through the reactor as a series of infinitely thin coherent “plugs”, each having a uniform composition. The plugs travel in the axial direction of the reactor, with each plug having a different composition from the ones before and after it.

Why does plug flow occur?

Plug flow can be described as a piston flow model. This is because the reaction occurring within differentially thin slugs of fluid fills the entire cross-section of the tube which are separated from one another by hypothetical pistons that prevent axial mixing.

Which is better PFR or CSTR?

A PFR has a higher theoretical efficiency than a CSTR of the same volume. That is, given the same space-time (or residence time), a reaction will proceed to a higher percentage completion in a PFR than in a CSTR.

What is plug flow Behaviour?

From Wikipedia, the free encyclopedia. In fluid mechanics, plug flow is a simple model of the velocity profile of a fluid flowing in a pipe. In plug flow, the velocity of the fluid is assumed to be constant across any cross-section of the pipe perpendicular to the axis of the pipe.

What kind of model is a plug flow reactor?

Schematic diagram of a plug flow reactor The plug flow reactor model (PFR, sometimes called continuous tubular reactor, CTR, or piston flow reactors) is a model used to describe chemical reactions in continuous, flowing systems of cylindrical geometry.

How is the PFR model used in reactor design?

The PFR model is used to predict the behavior of chemical reactors of such design, so that key reactor variables, such as the dimensions of the reactor, can be estimated.

Why are long diameter tubes used in plug flow reactors?

The choice of diameter is based on construction cost, pumping cost, the desired residence time, and heat transfer needs. Typically, long small diameter tubes are used with high reaction rates and larger diameter tubes are used with slow reaction rates.

What are the uses of a tubular reactor?

Common industrial uses of tubular reactors are in gasoline production, oil cracking, synthesis of ammonia from its elements, and the oxidation of sulfur dioxide to sulfur trioxide. Pictured below is a tubular reactor used in research on the oxidation of nitrogen compounds. It reaches temperatures of 800 – 1100°C.