Use of low gwp refrigerants comprising cf3i with stable lubricants

a technology of low gwp and stable lubricants, which is applied in the direction of dental surgery, light and heating apparatus, teeth capping, etc., can solve the problems of unrecognized and/or unrecognized problems, the use of such compositions presents heretofore uncounted and/or unrecognized problems, and the ineffectiveness of several embodiments of such compositions for commercially acceptable heat transfer systems

Inactive Publication Date: 2008-05-15
HONEYWELL INT INC
View PDF2 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, iodinated compounds, such as trifluoroiodomethane, tend to be relatively unstable, and often significantly less stable than certain CFCs, HCFCs and HFCs, especially under conditions that tend to occur in heat transfer systems in general and in refrigeration/air conditioning systems in particular.
Although compositions containing iodocarbons, and in particular CF3I, can have substantial advantages when used in heat transfer applications, the use of such compositions presents heretofore unencountered and/or unrecognized problems.
By way of example, compositions comprising iodocarbons, particularly com

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Use of low gwp refrigerants comprising cf3i with stable lubricants
  • Use of low gwp refrigerants comprising cf3i with stable lubricants
  • Use of low gwp refrigerants comprising cf3i with stable lubricants

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049]A standard test used by the industry for evaluation of thermal stability of refrigeration systems is the Sealed Tube Stability Test (ASHRAE 97-99). In this test, refrigerant and lubricant, typically in the weight ratio of 1:1, are sealed into an evacuated glass tube containing samples of selected metals, copper, steel, and aluminum immersed in the liquid. The tube is then maintained at 175° C. for 14 days, cooled, and the contents removed for analysis. The refrigerant is analyzed by gas chromatography for degradation; the lubricating oil is analyzed for changes in total acid number, TAN, and the presence of metals and halide ions; and the metal samples are evaluated for corrosion. This accelerated test simulates the interaction between the lubricant and the refrigerant in the presence of the mixed metals of construction. A good refrigeration lubricant will not cause degradation of the refrigerant or corrosion of the metals.

[0050]Three lubricants with different amounts of terti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention pertains to heat transfer compositions, particularly to automobile refrigerants comprising a hydrofluoroalkene, an iodocarbon, and at least one lubricant having hydrogen atoms and carbon atoms, wherein no more than 17% of the total number of hydrogen atoms which are attached to a carbon atom are tertiary hydrogen atoms.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. provisional patent application Ser. No. 60 / 865,659 filed on Nov. 14, 2006, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention pertains to heat transfer compositions. More particularly the invention relates to automobile refrigerants comprising a hydrofluoroalkene, an iodocarbon, and at least one lubricant having hydrogen atoms and carbon atoms, wherein no more than 17% of the total number of hydrogen atoms which are attached to a carbon atom are tertiary hydrogen atoms.[0004]2. Description of the Related Art[0005]Compositions containing iodocarbon compounds have been disclosed as being particularly useful as heat transfer fluids. For example, international application PCT / US05 / 46982, filed Dec. 21, 2005, which is incorporated herein by reference, discloses compositions containing one or more fluoroolefins and the iodocar...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K5/04B60H1/32F25B45/00F28F99/00
CPCC09K5/045C10N2240/30C09K2205/122C10N2040/30
Inventor THOMAS, RAYMOND H.SINGH, RAJIV R.SAMUELS, GEORGE J.SHANKLAND, IANWILSON, DAVID P.ROBINSON, ROY P.PUY, MICHAEL VAN DERWELCH, JOHN L.SHAFER, GREGORY J.SPATZ, MARK W.HULSE, RYAN
Owner HONEYWELL INT INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap