Amine treatment of polysaccharide solution

Claim 2

A thermostable, viscous xanthan polysaccharide solution prepared by heating a xanthan polysaccharide solution in the presence of at least one C 1 to C 10 alkyl- or C 3 to C 10 cycloalkyl substituted primary or secondary mono- or diamine having an upper limit of 15 total carbon atoms, wherein said xanthan polysaccharide solution is heated in the presence of said mono- or diamine at a temperature in the range of about 30° to about 130° C. from about 5 minutes to 120 minutes.

Claim 3

A xanthan polysaccharide solution according to claim 1 wherein said polysaccharide is B-1459.

Claim 4

A xanthan polysaccharide solution according to claim 1 wherein said monoamine or diamine is one selected from the group consisting of: (a) a compound of the formula: ##STR2## (b) a compound of the formula: ##STR3## (c) a compound of the formula: ##STR4## (d) a compound of the formula: ##STR5## (e) a compound of the formula: ##STR6## (f) a compound of the formula: ##STR7## (g) a compound of the formula: ##STR8## (h) a compound of the formula: ##STR9## (i) a compound of the formula: ##STR10## (j) a compound of the formula: ##STR11## wherein each R independently represents either a C 1 to C 10 alkyl radical or C 3 to C 10 cycloalkyl radical, each R 1 independently represents either H, a C 1 to C 10 alkyl radical or a C 3 to C 10 cycloalkyl radical, x represents an integer from 2 to 10, y represents an integer from 1 to 10, and z represents an integer from 0 to 6, with the proviso that the amine contain an upper limit of a total of 15 carbon atoms.

Claim 5

A xanthan polysaccharide solution according to claim 3 wherein said monoamine or diamine is one selected from the group consisting of propylamine, cyclohexylamine, diethylamine, ethylenediamine, propylene-1,3-diamine, and hexamethylenediamine.

Claim 6

A xanthan polysaccharide solution according to claim 1 heated in the presence of from about 10 to 200 weight percent of said mono- or diamine.

Claim 7

A xanthan polysaccharide solution according to claim 5 heated in the presence of from about 25 to 100 weight percent of said mono- or diamine.

Claim 8

A process for the production of a thermostable, viscous xanthan polysaccharide solution comprising heating a xanthan polysaccharide solution in the presence of at least one C 1 to C 10 alkyl or C 3 to C 10 cycloalkyl substituted primary or secondary mono- or diamine containing an upper limit of 15 total carbon atoms wherein said xanthan polysaccharide solution is heated in the presence of said mono- or diamine at a temperature in the range of 30° C. to 130° C. from about 5 minutes to 120 minutes.

Claim 9

A process for the production of a thermostable, viscous xanthan polysaccharide solution comprising heating a xanthan polysaccharide solution in the presence of at least one C 1 to C 10 alkyl or C 3 to C 10 cycloalkyl substituted primary or secondary mono- or diamine containing an upper limit of 15 total carbon atoms wherein said xanthan polysaccharide solution is heated in the presence of said mono- or diamine at a temperature in the range of 30° C. to 130° C. from about 5 minutes to 120 minutes.

Claim 10

A process according to claim 7 wherein said xanthan polysaccharide is B-1459.

Claim 11

A process according to claim 7 wherein said monoamine or diamine is one selected from the group consisting of: (a) a compound of the formula: ##STR12## (b) a compound of the formula: ##STR13## (c) a compound of the formula: ##STR14## (d) a compound of the formula: ##STR15## (e) a compound of the formula: ##STR16## (f) a compound of the formula: ##STR17## (g) a compound of the formula: ##STR18## (h) a compound of the formula: ##STR19## (i) a compound of the formula: ##STR20## (j) a compound of the formula: ##STR21## wherein each R independently represents either a C 1 to C 10 alkyl radical or C 3 to C 10 cycloalkyl radical, each R 1 independently represents either H, a C 1 to C 10 alkyl radical or a C 3 to C 10 cycloalkyl radical, x represents an integer from 2 to 10, y represents an integer from 1 to 10, and z represents an integer from 0 to 6, with the proviso that the amine contain an upper limit of a total of 15 carbon atoms.

Claim 12

A process according to claim 7 wherein said monoamine or diamine is one selected from the group consisting of propylamine, cyclohexylamine, diethylamine, ethylenediamine, propylene-1,3-diamine, and hexamethylenediamine.

Claim 13

A process according to claim 7 wherein said xanthan polysaccharide solution is heated in the presence of from about 10 to 200 weight percent of said mono- or diamine.

Claim 14

A process according to claim 11 wherein said xanthan polysaccharide solution is heated in the presence of from about 25 to 100 weight percent of said mono- or diamine.

Claim 15

In a process for the enhanced recovery of oil employing a mobility buffer, the improvement which comprises using as the mobility buffer a thermostable, viscous polysaccharide solution prepared by the process of heating a xanthan polysaccharide solution in the presence of at least one C 1 to C 10 alkyl- or C 3 to C 10 cycloalkyl substituted primary or secondary mono- or diamine wherein said xanthan polysaccharide solution is heated in the presence of said mono- or diamine at a temperature in the range of 30° C. to 130° C. from about 5 minutes to 120 minutes.

Claim 16

In a process for the enhanced recovery of oil employing a mobility buffer, the improvement which comprises using as the mobility buffer a thermostable, viscous polysaccharide solution prepared by the process of heating a xanthan polysaccharide solution in the presence of at least one C 1 to C 10 alkyl- or C 3 to C 10 cycloalkyl substituted primary or secondary mono- or diamine wherein said xanthan polysaccharide solution is heated in the presence of said mono- or diamine at a temperature in the range of 30° C. to 130° C. from about 5 minutes to 120 minutes.

Claim 17

A xanthan polysaccharide solution according to claim 13 wherein said polysaccharide is B-1459.

Claim 18

A xanthan polysaccharide solution according to claim 13 wherein said monoamine or diamine is one selected from the group consisting of: (a) a compound of the formula: ##STR22## (b) a compound of the formula: ##STR23## (c) a compound of the formula: ##STR24## (d) a compound of the formula: ##STR25## (e) a compound of the formula: ##STR26## (f) a compound of the formula: ##STR27## (g) a compound of the formula: ##STR28## (h) a compound of the formula: ##STR29## (i) a compound of the formula: ##STR30## (j) a compound of the formula: ##STR31## wherein each R independently represents either a C 1 to C 10 alkyl radical or C 3 to C 10 cycloalkyl radical, each R 1 independently represents either H, a C 1 to C 10 alkyl radical or a C 3 to C 10 cycloalkyl radical, x represents an integer from 2 to 10, y represents an integer from 1 to 10, and z represents an integer from 0 to 6, with the proviso that the amine contain an upper limit of a total of 15 carbon atoms.

Claim 19

A xanthan polysaccharide solution according to claim 13 wherein said monoamine or diamine is one selected from the group consisting of propylamine, cyclohexylamine, diethylamine, ethylenediamine, propylene-1,3-diamine, and hexamethylene diamine.