What is PP-R?
The full name for "PP-R" is "PolyPropylene Random Copolymer". PP-R is one of the longest lasting and most chemically inert piping materials available. PP-R contains no toxic materials such as PVC, BPAs, dioxins, phthalates or VOCs, which could leach out under extreme condictions such as distillation.
PP-R demonstrates outstanding chemical resistance. For ethanol distillers, the equipment material must tolerate hot ethanol, small amounts of methanol, acetic acid, acetone. Here are two chemical compatibility charts which have all these listed and more:
Summary table (from the link above) of PP-R chemical compatibility for ethanol distillers:
PP-R in the Brewing Industry
Some videos about brewing companies using PP-R in their operations:
PP-R has a melting temperature of 150°C. The softening temperature is about 110°C.
PP-R has a thermal conductivity of 0.24W/m°C. This a hundred times lower than steel, and perhaps 500 times lower than copper.
Common plastics thermal properties table is here:
In an application where an object is totally immersed in a heated solution, the temperature of the plastic will be equal to the heated liquid. The bubble caps are an example of this. They are totally immersed in the heated liquid/gas and they will be at the same temperature as the heated liquid/gas.
However, in an application such as a distillation column, the INSIDE of the column is at process temperature, and the OUTSIDE of the column is at room temperature. This means a temperature gradient forms across the plastic wall. The question is: what is the temperature across the plastic wall?
I hired a mechanical engineer to calculate the wall temperature as a function of distance through the wall.
VIDEO:We posted a video on YouTube which explains all this:
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