# US 5,344,996 A · Catalyst removal from alcohol alkoxylates using acid clays

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- Number: US 5,344,996 A
- Document ID: US5344996A
- Status: Granted
- Kind: A
- Application number: 07/955,214
- Filed: 1992-10-01
- Granted: 1994-09-06
- Earliest claimed: 1991-10-18
- Assignees: Texaco Chemical Company
- Inventors: Edward C. Nieh; Michael Cuscurida
- Web page: https://patentgrep.com/patent/US5344996A

## CPC

- C08G 65/30: Post-polymerisation treatment, e.g. recovery, purification, drying
- C07C 41/36: by solid-liquid treatment; by chemisorption
- C07C 41/44: by treatments giving rise to a chemical modification (by chemisorption C07C41/36)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The removal of basic alkaline earth metal catalysts from alcohol alkoxylate product streams using acid days wetted with water is described. The catalyst level may be reduced to 1 ppm or less in many instances. Effective acid days include, but are not limited to silica days, silica magnesia clays, alumina, montmorillonite days, mixtures thereof and the like. Contacting of the day with the alcohol alkoxylate may take place at ambient to 120.degree. C.

## Claims

### Claim 1

A process for removing residual basic alkaline earth catalysts from alcohol alkoxylate products made from alcohols having up to 18 carbon atoms containing the same, comprising the steps of:
wetting an acid clay with water to saturate and coat the surface of the clay;
contacting an alcohol alkoxylate product made from alcohols having up to 18 carbon atoms containing at least one basic alkaline earth catalyst with the wet acid clay; and
recovering a purged alcohol alkoxylate product made from alcohols having up to 18 carbon atoms.

### Claim 2 (depends on 1)

The process of claim 1 where the acid clay is selected from the group consisting of silica clay, magnesia clay, silica magnesia clay, alumina clay and montmorillonite clay, or mixtures thereof.

### Claim 3 (depends on 1)

The process of claim 1 where the clay has a pH and the pH is 7 or below and where the clay does not swell in the presence of alcohol alkoxylates.

### Claim 4 (depends on 1)

The process of claim 1 where the process is conducted at a temperature in the range from about ambient to 120.degree. C.

### Claim 5 (depends on 1)

Te process of claim 1 where the amount of basic alkaline earth catalyst within the purged polyalkoxylate product is equal to or less than about 1 ppm.

### Claim 6

A process for removing residual basic alkaline earth catalysts from alcohol alkoxylate products made from alcohols having up to 18 carbon atoms containing the same, comprising the steps of:
wetting an acid clay with water to saturate and coat the surface of the clay, where the acid clay has a pH of 7 or less and is selected from the group consisting of silica clay, magnesia clay, silica magnesia clay, alumina clay, montmorillonite clay, and mixtures thereof;
contacting an alcohol alkoxylate product made from alcohols having up to 18 carbon atoms containing at least one basic alkaline earth catalyst with the wet acid clay; and
recovering a purged alcohol alkoxylate made from alcohols having up to 18 carbon atoms.

### Claim 7 (depends on 6)

The process of claim 6 where the process is conducted at a temperature in the range from about 80 to 120.degree. C.

### Claim 8 (depends on 6)

The process of claim 6 where the amount of basic alkaline earth catalyst within the purged polyalkoxy products is equal to or less than about 1 ppm.

### Claim 9

A process for removing residual basic alkaline earth catalysts from alcohol alkoxylate products made from alcohols having up to 18 carbon atoms containing the same, comprising the steps of:
wetting an acid clay with water to saturate and coat the surface of the clay, where the acid clay has a pH of 7 or less and does not swell in the presence of alcohol alkoxylates, and is selected from the group consisting of silica clay, magnesia clay, silica magnesia clay, alumina clay, montmorillonite clay, and mixtures thereof;
contacting an alcohol alkoxylate product made from alcohols having up to 18 carbon atoms containing at least one basic alkaline earth catalyst with the wet acid clay at a temperature in the range from about 80 to 120.degree. C.; and
recovering a purged alcohol alkoxylate product where the basic alkaline earth catalyst is absorbed by the wet acid clay and the amount of basic alkaline earth catalyst within the purged alcohol alkoxylate product made from alcohols having up to 18 carbon atoms.