# US 5,344,989 A · Zeolite ZK-5 catalyst for conversion of methanol and ammonia to monomethylamine and dimethylamine

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- Number: US 5,344,989 A
- Document ID: US5344989A
- Status: Granted
- Kind: A
- Application number: 08/077,578
- Filed: 1993-06-15
- Granted: 1994-09-06
- Earliest claimed: 1993-06-15
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: David R. Corbin; Stephan Schwarz
- Web page: https://patentgrep.com/patent/US5344989A

## CPC

- C07C 209/16: with formation of amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

An improved process for production of monomethylamines and dimethylamines, wherein an acidic zeolite H--ZK-5 prepared from K,Sr--ZK-5 is used to increase selectivity of the reaction.

## Claims

### Claim 1

An improved process for producing dimethylamine and monomethylamine comprising:
contacting methanol and/or dimethylether and ammonia, in amounts sufficient to provide a carbon/nitrogen ratio from about 0.2 to about 1.5 and at a reaction temperature from about 250.degree. C. to about 450.degree. C., in the presence of a catalytic amount of an acidic zeolite H--ZK-5;
wherein the improvement comprises using an acidic zeolite H--ZK-5 which has been obtained by ion exchange of K,Sr--ZK-5.

### Claim 2 (depends on 1)

The process of claim 1, wherein said acidic zeolite H--ZK-5 has been prepared from K,Sr--ZK-5 in a process comprising the steps of:
(a) performing an ion exchange reaction between the K.sup.+ Sr.sup.2+ ions of the K,Sr--ZK-5 and NH4.sup.+ ions, to yield NH.sub.4 --ZK-5; and
(b) calcining the NH.sub.4 --ZK-5 of step (a) at a temperature of about 400.degree. C. to about 700.degree. C., to yield H--ZK-5.

### Claim 3 (depends on 1)

The process of claim 1, wherein the H--ZK-5 has been modified by treatment with one or more compounds containing at least one element selected from the group consisting of silicon, aluminum, phosphorous, and boron, to deposit thereon at least 0.05 weight percent of the element.

### Claim 4 (depends on 1)

The process of claim 1, wherein the reaction temperature is from about 300.degree. C. to about 400.degree. C.

### Claim 5 (depends on 1)

The process of claim 1, wherein the reaction pressures are from about 10 to about 500 psi.

### Claim 6 (depends on 1)

The process of claim 1, wherein the carbon/nitrogen ratio is from about 0.5 to about 1.2.

### Claim 7 (depends on 2)

The process of claim 2, wherein at step (b) the calcining temperature is from about 500.degree. C. to about 600.degree. C.