DE19539096A1 - Linear di:alkyl ether(s) - Google Patents

Abstract

Use of linear dialkyl ethers of formula R1-O-R2 (in which R<1> and R<2> (same or different) = linear saturated alkyl groups with 8-14 C) as heat exchanger medium in coolant circuits is new.

Description

introduction

The invention relates to the use of linear saturated dialkyl ethers as Heat transfer medium in cooling circuits.

State of the art

Heat exchanger or heat transfer media are used when the Heat that a medium is supposed to absorb or emit is not removed directly or can be supplied. These are substances that are among the Working conditions in liquid and / or gaseous state available. They are usually circulated around the heat pick up or drop off certain places. At such substances a number of requirements, such as:

• - chemical resistance under working conditions
• - low stick or solidification temperature
• - favorable properties, d. H. low viscosity, high thermal conductivity and Specific heat
• - high flash point
• - low corrosion
• - good environmental compatibility.

Furthermore, they should have a low vapor pressure, i.e. H. the Boiling temperature should be above the operating temperature at the corresponding one Operating pressure.

Water is often used as a heat transfer medium due to its physical nature Properties is the area of application, however, at temperatures between 0 and 100 ° C limited. By adding anti-freeze, water can be added Use to a certain extent as a heat transfer medium even at temperatures below 0 ° C. Another problem with the use of water as a heat carrier is the Corrosion.

Organic-based heat transfer media are also known. Mineral oils are only used in the liquid state, as it can at higher temperatures Cracking and oxidation processes are coming. Another disadvantage of Petrochemical heat transfer is their poor ecotoxicological Compatibility.

DE-A1 34 24 702 discloses the use of dialkyl ethers known as heat transfer fluids. These are preferably branched dialkyl ethers with at least 10 carbon atoms.

The published patent application DE-A1 41 03 489 describes a process for the production branched dialkyl ether and their use as heat exchange liquid described.

Special coolants based on organosilicon compounds are indeed compared to the petrochemical heat carriers more environmentally friendly, however generally point out a flash point below 60 ° C.

The object of the present invention was to find heat transfer media which are in can be used in a wide temperature range and also a good one have ecotoxicological tolerance.  

Description of the invention

The invention accordingly relates to the use of linear dialkyl ethers of formula (I):

R¹-O-R² (I)

in which R¹ and R² stand for linear, saturated alkyl radicals with 8 to 14 carbon atoms and R¹ and R² may be the same or different, as a heat transfer medium in Cooling circuits.

It has now surprisingly been found that linear dialkyl ethers are used are very suitable as a heat transfer medium even at high temperatures and at the same time have good ecotoxicological tolerance.

Due to the easier biodegradability, linear dialkyl ethers have better ecotoxicological compatibility compared to the corresponding branched dialkyl ethers:
The use of di-n-octyl ether is particularly preferred.

Claims (2)

1. Use of linear dialkyl ethers of the formula (I): R¹-O-R² (I) in the R¹ and R² for linear, saturated alkyl radicals with 8 to 14 carbon atoms stand and R¹ and R² may be the same or different than Heat transfer medium in cooling circuits. 2. Use of di-n-octyl ether as a heat transfer medium in cooling circuits.