How To Use High Pressure Reactors For PTFE Liner

September 30 17:28 2021

High pressure reactors Reactor liners made from PTFE guarantee optimal resistance to chemicals.

Corrosion protection included

A PTFE liner, which is several millimetres thick, protects the stainless steel reactor efficiently against corrosion, even against such corrosive media as acids and alkali. PTFE is distinguished by its excellent resistance to almost all chemicals, which makes it possible to do without many expensive special alloys. This significantly reduces the acquisition costs. 

The risk of possible cross-contaminations is easier to control with PTFE liners. Metallic catalysers, such as Pt, Rh, Raney Nickel etc adhere to steel reactors and are very difficult to remove. In the following experiments the question keeps cropping up if the effects observed are really caused by the change of catalyser, contamination effects or catalyst poisoning. This problem is elegantly evaded by reserving a PTFE liner for each type of catalyser.

Tip: The PTFE liners can also be used as practical storage vessels for reactive solutions.

Universal usage

High pressure reactors can be used for all purposes; all of the parts that come into contact with liquid phase are protected against chemical attack by means of fluoropolymers. The liner is hermetically sealed and clings to the inside of the reactor wall like a skin. Hence it differs significantly from the PTFE liners, which are placed open into the reactor. The entire liner comprises a removable PTFE insert, the cover lining, the dip pipe and agitator sheaths and the PTFE sealing rings. All of these parts can be removed and remounted easily for cleaning purposes. The thickness of the walls of the liner depends on the reactor volume and ranges between 1.6 and 7.4 mm. The lining of the cover is at least 3.7 mm thick. The maximum operating pressure of the reactors is 200 bars and the maximum temperature for continuous operation is 230 °C. For a short time (i.e. max. 60 min) the reactor can also be heated up to 260 °C. Higher tempera-tures and longer heating phases above 260°C damage the PTFE liner. 

Owing to these high operating temperatures, conventional PTFE components become “distorted”; but high pressure reactors components do not. These PTFE components have no preferred direction because, thanks to the isostatic compression-molding method developed by high pressure reactors have no preferred direction and distinguish themselves by the same expansion coefficients in all directions in space. A “distortion” of the parts, even at a higher temperature and pressure is thus excluded.

Advantages of PTFE-lining:

* High tempering strength, briefly up to +260 °C
* Pressure-tight up to 200 bars
* Universal resistance to chemicals, even to aggressive acids and alkali
* Non-corrosive
* Free of contamination

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