Claims
- 1. A method of preventing calcium carbonate scale formation on metal surfaces in contact with scale forming industrial process waters which comprises treating these waters with a scale inhibiting amount of an N-bis(phosphonomethyl) amino acid selected from the group consisting of:
- a. N,N-bis(phosphonomethyl) L-glutamic acid;
- b. N,N-bis(phosphonomethyl) L-serine; and,
- c. N,N,N'N'- bis(phosphonomethyl) L-lysine.
- 2. The method of claim 1 where the N-bis(phosphonomethyl) amino acid is N,N-bis(phosphonomethyl) L-glutamic acid.
- 3. The method of claim 1 where the N-bis(phosphonomethyl) amino acid is N,N-bis(phosphonomethyl) L-serine.
- 4. The method of claim 1 where the N-bis(phosphonomethyl) amino acid is N,N,N',N'-bis(phosphonomethyl) L-lysine.
Parent Case Info
This application is a division of Ser. No. 08/149,652, filing date, Nov. 9, 1993, now Pat. No. 5,414,112.
US Referenced Citations (10)
Non-Patent Literature Citations (2)
Entry |
Bachus, CA120:166669w, Jun. 8, 1993. |
CA119:259403, Feb. 5, 1993. |
Divisions (1)
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Number |
Date |
Country |
Parent |
149652 |
Nov 1993 |
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