Heat transfer promoters and method of using the same

• US 4,801,394 A
• Filed: 11/23/1987
• Issued: 01/31/1989
• Est. Priority Date: 10/19/1983
• Status: Expired due to Term

• Current Assignee: Kunio Mori, Kabushiki Kaisha Toshiba (Toshiba Corporation), Yoshiro Nakamura
• Original Assignee: Kunio Mori, Kabushiki Kaisha Toshiba (Toshiba Corporation), Yoshiro Nakamura
• Inventors: Mori, Kunio, Nakamura, Yoshiro, Okumura, Minoru, Miyazaki, Matsuo, Mochida, Yoshio
• Primary Examiner(s): Page, Thurman K.
• Application Number:
  US07/124,363
• Time in Patent Office: 435 Days
• Field of Search: 252/71, 252/74, 252/75
• US Class Current: 252/75
• CPC Class Codes: C09K 5/04 the change of state being from liquid to vapour or vice versa
• CPC Class Codes: Y10T 428/13 Hollow or container type article [e.g., tube, vase, etc.]

Abstract

A heat transfer promoter composition comprises a triazine-dithiol derivative represented by the general formula ##STR1## wherein R represents --NHR'"'"' or --NR'"'"'₂ wherein: R'"'"' is a hydrocarbon group; M is selected from the group consisting of hydrogen, alkali metals, and alkaline earth metals; and at least one of M groups is alkaline metal or alkaline earth metal. This heat transfer promotor is applied to that surface of a condenser tube to be contacted by a vapor to be condensed.

Claims

1. A composition of matter for application to a metal surface in a vapor-liquid condensation system to promote the heat transfer properties of the surface, comprising:

(a) an active ingredient comprised of a triazine-dithiol derivative represented by the formula ##STR5## wherein R represents --NHR'"'"' or --NR'"'"'₂ ;

R'"'"' is a hydrocarbon group containing from 4 to 18 carbon atoms;

M is selected from hydrogen, alkali metal, and alkaline earth metal; and

at least one of the M groups is an alkali metal or an alkaline earth metal and

(i) when R is --NHR'"'"', R'"'"' is a hydrocarbon group containing at least four carbon atoms,

(ii) when R is --NR'"'"'₂, R'"'"' is a hydrocarbon group containing at least eight carbon atoms,

(iii) when R'"'"' is an aromatic hydrocarbon it contains at least 7 carbon atoms; and

(b) a an aqueous solvent for said active ingredient.

2. A composition according to claim 1, wherein said R'"'"' is an oleyl group, a decyl group, an octyl group or a dodecyl group.

3. A composition according to claim 1, wherein M is H, Li, Na, K, 1/2Mg, 1/2Ca or 1/2Ba.

4. A composition according to claim 1, wherein said R'"'"' is an aromatic hydrocarbon group.

5. A composition according to claim 4, wherein said aromatic hydrocarbon group is a methyl benzyl group.

6. A composition according to claim 1, wherein said R'"'"' is an aliphatic hydrocarbon group having at least 8 carbon atoms.

7. A composition according to claim 1, wherein said triazine-dithiol derivative is a member selected from the group consisting of monosodium 2-octylamino-4,6-dimercapto-S-triazine, monosodium 2-dioctylamino-4,6-dimercapto-S-triazine, monosodium 2-diodecylamino-4,6-dimercapto-S-triazine, monosodium 2-oleylamino-4,6-dimercapto-S-triazine and monosodium 2-didecylamino-4,6-dimercapto-S-triazine.

8. A composition according to claim 1, wherein said composition comprises a concentration of about 10^-3 moles of said triazine-dithiol derivative per liter of said solvent.

9. A composition according to claim 1, wherein said composition comprises said traizine-dithiol derivative in an amount sufficient to promote the heat transfer of a heat transfer tube used in a vapor-liquid condensation system.

10. A composition according to claim 1, wherein said composition comprises said triazine-dithiol derivative in an amount sufficient to provide a metal surface treated with said composition with a contact angle of water of above about 66°

as measured at a temperature of about 20°

C. using an Elmagoniometer-type apparatus.

11. A composition according to claim 1, wherein said composition comprises said triazine-dithiol derivative in an amount sufficient to provide a durability time of said composition bonded to a metal surface of more than about 43 minutes as measured under the conditions of a load of about 50 grams and a sliding velocity of about 5 cm per minute using a pin disc-type abrasion tester.

12. A composition according to claim 1, wherein said triazine-dithiol derivative in monosodium 2-octylamino-4,6-dimercapto-S-triazine.

13. A composition according to claim 1, wherein said triazine-dithiol derivative is monosodium 2-dioctylamino-4,6-dimercapto-S-triazine.

14. A composition according to claim 1, wherein said triazine-dithiol derivative is monosodium 2-didodecylamino-4,6-dimercapto-S-triazine.

15. A composition according to claim 1, wherein said triazine-dithiol derivative is monosodium 2-oleylamino-4,5-dimercapto-S-triazine.

16. A composition according to claim 1, wherein said traizine-dithiol derivative is monosodium 2-didecylamino-4,6-dimercapto-S-triazine.