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US 8,505,626 B2Granted
α-Amino acid phosphonic acid compounds, method of preparation of use thereof
AssigneeDequest AG
InventorsPatrick Notte, Albert Devaux
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Abstract
Novel aminoacid alkylphosphonic acid compounds are disclosed. These compounds can be used in multiple applications, in particular in a scale inhibitor functionality in aqueous systems, including in marine oil recovery.
Claims10
A method of inhibiting scale formation in water using an aminoacid alkyphosphonic acid compound having the general formula:
- A-(B)x
- wherein A is an α-amino acid moiety selected from the group of:
- arginine;
- histidine;
- isoleucine;
- leucine;
- methionine;
- threonine;
- and phenylalanine;
- and
- wherein B is an alkyiphosphonic acid moiety having from 1 to 6 carbon atoms in the alkyl group;
- with the proviso that x is an integer of from 1 to 6 in the event the amino acid moiety is arginine and from 1 to 3 in the event the amino acid moiety is histidine and x is 2 in the event the amino acid moiety is selected from leucine, isoleucine, methionine, threonine and phenylalanine in scale forming water systems containing more than 100 mg barium and/or strontium and/or calcium carbonate hardness per liter, said systems having a pH between 2 and 10, whereby from 0.1 to 800 ppm of the aminoacid alkyiphosphonic acid scale inhibitor are added to the scale forming water system.
9 more elements
A method for oil recovery by injecting into marine oil wells an aqueous solution of an aminoacid phosphonic acid compound having the general formula:
- A-(B)x
- wherein A is an α-amino acid moiety selected from the group of:
- arginine;
- histidine;
- isoleucine;
- leucine;
- methionine;
- threonine;
- and phenylalanine;
- and
- wherein B is an alkylphosphonic acid moiety having from 1 to 6 carbon atoms in the alkyl group;
- with the proviso that x is an integer of from 1 to 6 in the event the amino acid moiety is arginine and from 1 to 3 in the event the amino acid moiety is histidine and x is 2 in the event the amino acid moiety is selected from leucine, isoleucine, methionine, threonine and phenylalanine in a level of from 0.1 to 100000 ppm.
9 more elements
Dependencies are inferred from the claim text.