Method of preparing acyloxybenzenesulfonic acids and salts thereof

Claim 2

A process for making an acyloxybenzene sulfonic acid, said process comprising reacting an aryl ester of an organic acid said ester having the formula: ##STR5## wherein R is a hydrocarbon radical containing up to 30 carbon atoms and is selected from the group consisting of alkyl, alkenyl, cycloalkyl, aryl, arylalkyl and alkaryl with sulfur trioxide to form said acyloxybenzene sulfonic acid.

Claim 3

A process of claim 1 wherein R is an alkyl group.

Claim 4

A process of claim 2 wherein said alkyl group contains about 5-11 carbon atoms.

Claim 5

A process of claim 3 wherein said alkyl group is a substantially linear alkyl group.

Claim 6

A process for making an alkali metal or alkaline earth metal salt of an acyloxybenzene sulfonic acid, said process comprising (A) reacting an aryl ester of an organic acid having the formula ##STR6## wherein R is a hydrocarbon radical containing up to 30 carbon atoms and is selected from the group consisting of alkyl, alkenyl, cycloalkyl, aryl, aryalkyl and alkaryl with sulfur trioxide to form an acyloxybenzene sulfonic acid; (B) neutralizing the sulfonic acid groups on said acyloxybenzene sulfonic acid with an alkali metal or alkaline earth metal base selected from oxides, hydroxides, carbonates and acid carbonates to form said alkali metal or alkaline earth metal salt of an acyloxybenzene sulfonic acid; and (C) recovering said acyloxybenzene sulfonic acid salt.

Claim 7

A process for making an alkali metal or alkaline earth metal salt of an acyloxybenzene sulfonic acid, said process comprising (A) reacting an aryl ester of an organic acid having the formula ##STR6## wherein R is a hydrocarbon radical containing up to 30 carbon atoms and is selected from the group consisting of alkyl, alkenyl, cycloalkyl, aryl, aryalkyl and alkaryl with sulfur trioxide to form an acyloxybenzene sulfonic acid; (B) neutralizing the sulfonic acid groups on said acyloxybenzene sulfonic acid with an alkali metal or alkaline earth metal base selected from oxides, hydroxides, carbonates and acid carbonates to form said alkali metal or alkaline earth metal salt of an acyloxybenzene sulfonic acid; and (C) recovering said acyloxybenzene sulfonic acid salt.

Claim 8

A process of claim 5 wherein R is an alkyl group.

Claim 9

A process of claim 6 wherein said alkyl group contains about 5-11 carbon atoms.

Claim 10

A process of claim 7 wherein said alkyl group are substantially linear alkyl groups.

Claim 11

A process of claim 5 wherein the neutralizing of said sulfonic acid group is done using an alkali metal hydroxide, carbonate or acid carbonate.

Claim 12

A process of claim 9 wherein said neutralizing of said sulfonic acid groups is done with an alkali metal hydroxide.

Claim 13

A process of claim 10 wherein said neutralizing of said sulfonic acid groups is done with an aqueous solution of an alkali metal hydroxide.

Claim 14

A process of claim 11 wherein said alkali metal hydroxide is sodium hydroxide.

Claim 15

A process of claim 9 wherein the neutralization of said sulfonic acid groups is done using a solution or slurry of an alkali metal hydroxide or carbonate in a polar solvent.

Claim 16

A process of claim 13 wherein said polar solvent is a lower alcohol.

Claim 17

A process of claim 14 wherein said alcohol is selected from methanol, ethanol and isopropanol.

Claim 18

A process of claim 11 wherein R is an alkyl containing 5-11 carbon atoms.

Claim 19

A process of claim 12 wherein R is an alkyl containing about 5-11 carbon atoms.

Claim 20

A process of claim 9 wherein said neutralizing of said sulfonic acid groups is done using a solution or slurry of an alkali metal hydroxide or carbonate in a polar solvent.

Claim 21

A process of claim 18 wherein said polar solvent is a lower alcohol.

Claim 22

A process of claim 19 wherein said lower alcohol is methanol, ethanol or isopropanol.