Consistent performance over thousands of hours of operation
The name Diphyl denotes a family of products produced by mixing diphenyl oxide and biphenyl. The clear, slightly yellowish fluid has low viscosity and its solidification point is 12° Celsius. This is clearly lower than that of the pure compounds. Diphyl is consequently already liquid at room temperature, and can be easily filled into the plant. In contrast to water, its volume decreases when the liquid solidifies. This is an advantage for instruments and pipes: they are not damaged by the solidification of the Diphyl contained in them.
Chemically, this heat transfer medium patented in 1929, which withstands temperatures of up to 400° Celsius, is not complicated. Diphyl remains near-constant in its properties for thousands of hours of operation, even under tremendous heat. At temperatures above 340° Celsius, the product is, in fact, unique. Compared with mineral-oil-based heat transfer media, Diphyl guarantees higher thermal stability with optimal heat transfer properties and a long life.
Advantageous in the vapor phase
In the vapor phase, particularly, Diphyl shows why the mixture of biphenyl and diphenyl oxide proves to be such a good one in practice. The composition of the mixture has an exact boiling point, which manufacturers can make good use of in the vapor phase. For precise temperature compliance, as required in the spinning and, above all, polymerization processes, this is often crucial to the quality of the manufactured product.
Murdotec Kunststoffe, a Dortmund manufacturer of semi-finished thermoplastic products, makes high-quality plastics for mechanical engineering. The company uses Diphyl DT as the heat transfer medium in production. “In the manufacture of semi-finished products from ultra-high molecular weight polyethylene, temperatures between 20° Celsius and 240° Celsius are required in our pressing plant. Feed temperatures and film temperatures above 300° Celsius in the heating system and low viscosity at temperatures below 40° Celsius were the deciding reasons for using Diphyl DT. The outstanding service from the LANXESS distributor, Obermeier, from Bad Berleburg further vindicated our decision,” explains Josef Ikemann, CEO of Murdotec Kunststoffe GmbH & Co. KG.
