# US 5,346,535 A · Use of crystalline molecular sieves containing charged octahedral sites in removing volatile organic compounds from a mixture of the same

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- Number: US 5,346,535 A
- Document ID: US5346535A
- Status: Granted
- Kind: A
- Application number: 07/749,012
- Filed: 1991-08-23
- Granted: 1994-09-13
- Earliest claimed: 1991-08-23
- Assignees: Engelhard Corporation
- Inventors: Steven M. Kuznicki; Dinh Dang; David T. Hayhurst; Kathleen A. Thrush
- Web page: https://patentgrep.com/patent/US5346535A

## CPC

- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01J 20/183: {Physical conditioning without chemical treatment, e.g. drying, granulating, coating, irradiation}
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

Crystalline molecular sieves containing octahedral sites such as the sieves known as ETS-4, ETS-10 and ETAS-10 are used to remove volatile organic compounds from a mixture of the same with moist air at ambient temperature.

## Claims

### Claim 1

A cyclic process for the removal of volatile organic compounds from a mixture of the same with moist gas stream wherein said mixture is adsorbed at ambient temperature or substantially ambient temperature and is subsequently desorbed which comprises contacting said mixture with a molecular sieve containing octahedrally coordinated active sites and thereafter thermally regenerating said sieve at temperatures up to 150.degree. C.

### Claim 2 (depends on 1)

The process of claim 1 wherein said gas stream is air.

### Claim 3 (depends on 2)

The process of claim 2 wherein desorption takes place by changing the pressure.

### Claim 4 (depends on 3)

The process of claim 3 wherein said process comprises a pressure swing.

### Claim 5 (depends on 2)

The process of claim 2 wherein said sieve is ETS-4, ETS-10 and ETAS-10 and chemically modified versions and mixtures thereof.

### Claim 6 (depends on 2)

The process of claim 2 wherein said desorption is caused by passing a fluid through said molecular sieve.

### Claim 7 (depends on 1)

The process of claim 1 wherein said process comprises a temperature swing.