# US 5,710,329 A · Antifoulant for acrylic acid purification

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- Number: US 5,710,329 A
- Document ID: US5710329A
- Status: Granted
- Kind: A
- Application number: 08/735,772
- Filed: 1996-10-23
- Granted: 1998-01-20
- Earliest claimed: 1996-10-23
- Assignees: Nalco/Exxon Energy Chemical, L. P.
- Inventors: Hester A. Clever
- Web page: https://patentgrep.com/patent/US5710329A

## CPC

- C07C 51/50: Use of additives, e.g. for stabilisation
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The invention comprises a method of dispersing foulants, residues, gums, precipitates, polymeric tars and other highly oxidized carbonaceous tars which can be formed in the process of manufacture and recovery of acrylic acid. The method comprises adding to the liquid or gaseous phases passing through, or stored in acrylic acid process equipment, an effective antifouling amount of a dispersant which is stable in the environment within an acrylic acid process and is compatible with the equipment used for the manufacture of acrylic acid.

## Claims

### Claim 1

A method of dispersing tars, gums, and foulants in acrylic acid monomer process equipment which comprises adding to the liquid or gaseous phases contained therein an effective antifouling amount of an antifoulant, said antifoulant having the structure:
R(SO.sub.3).sub.n M
wherein R is a hydrocarbonaceous group having from 1-34 carbon atoms chosen from linear or branched alkyl groups, aromatic, cyclic, alkaryl, aralkyl, or alkenyl groups, alkyl diphenyl ether groups, dialkyl naphthalene groups, or mixtures thereof; M is chosen from the group consisting of hydrogen, alkali metal, alkaline earth metal, ammonium cation, alkyl ammonium cation, or mixtures thereof; and n ranges from 1 to about 6.

### Claim 2 (depends on 1)

The method of claim 1 wherein the antifoulant is chosen from the group consisting of dodecylbenzene sulfonic acid, methyl sulfonic acid, toluene sulfonic acid, alkyl diphenyl ether disulfonic acid, dialkyl naphthalene sulfonic acid, dioctyl sulfosuccinic acid, and mixtures thereof.

### Claim 3 (depends on 1)

The method of claim 1 wherein the antifoulant is admixed with an organic polar solvent chosen from ketones, ethers, esters, alcohols, organic acids or mixtures thereof.

### Claim 4 (depends on 1)

The method of claim 1 wherein the effective amount of antifoulant ranges between about 10-20,000 ppm antifoulant, based on the process stream being treated.

### Claim 5 (depends on 4)

The method of claim 4 wherein the effective amount of antifoulant ranges between about 100-10,000 parts per million.

### Claim 6 (depends on 5)

The method claim 5 wherein the effective amount ranges from about 1000-7500 parts per million antifoulant.

### Claim 7 (depends on 1)

The method of claim 1 wherein the antifoulant is admixed with an organic polar solvent chosen from the group consisting of acetic acid, acetone, butyl cellosolve, ethyl acetate, diacetone alcohol, and mixtures thereof.