Branched organosiloxanes used as heat transfer fluid

Patent metadata

Field	Value
Publication number	US-10351747-B2
Application number	US-201615544122-A
Country	US
Kind code	B2
Filing date	Jan 26, 2016
Priority date	Feb 6, 2015
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

The invention relates to a method for operating a system at an operating temperature of between 300° C. and 500° C., using a heat transfer fluid comprising branched siloxanes of general formula (I) (R3SiO1/2), (SiO4/2) in which w represents integral values of between 4 and 20, z represents integral values of between 1 and 15, and R represents a methyl group, the sum of the fractions of all siloxanes of general formula (1) being at least 95 mass %, in relation to the whole heat transfer fluid.

First claim

What is claimed is:

1. A method of operating a system at an operating temperature of 300° C. to 500° C. using a siloxane-based heat transfer fluid, said method comprising providing in the system a heat transfer fluid comprising branched siloxanes of general formula I
(R 3 SiO 1/2 ) w (SiO 4/2 ) z ,  (I)

where
w represents integer values from 4 to 10,
z represents integer values from 1 to 4,
R represents methyl,
wherein
a sum total of proportions of all siloxanes of general formula I is not less than 99.5% by mass, based on the heat transfer fluid as a whole.

2. The method as claimed in claim 1 wherein w represents 4 and z represents 1.

3. The method as claimed in claim 2 wherein the heat transfer fluid contains dissolved suspended or emulsified additives as well as siloxanes of general formula I.

4. The method as claimed in claim 3 wherein the sum total of the proportions of all siloxanes of general formula I is not less than 99.5% by mass, based on the heat transfer fluid as a whole.

5. The method as claimed in claim 4 wherein the system is a solar thermal device.

6. The method as claimed in claim 5 wherein the system is a concentrated solar power (CSP) power plant.

7. The method as claimed in claim 1 wherein the heat transfer fluid contains dissolved, suspended or emulsified additives as well as siloxanes of general formula I.

8. The method as claimed in claim 1 wherein the system is a solar thermal device.

9. The method as claimed in claim 8 wherein the system is a concentrated solar power (CSP) power plant.

Assignees

• Wacker Chemie Ag

Inventors

• Doerrich Steffen
• Weidner Richard
• Heidsieck Sven
• Rieger Bernhard

Classifications

• F24S80/20

  Working fluids specially adapted for solar heat collectors · CPC title

• C09K5/10 Primary

  Liquid materials · CPC title

• Y02E10/40

  Solar thermal energy, e.g. solar towers · CPC title

• C07F7/0838

  Compounds with one or more Si-O-Si sequences (compounds with a ring containing only alternating Si and O atoms, i.e. cyclosilanes C07F7/21) · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title