Process for the separation and recycling of NO.sub.x gas constituents through adsorption and desorption on a molecular sieve

US4533365A · kind A · utility

Assignee

• Kernforschungsanlage Lulich Gesellschaft mit beschrankter Haftung · DE

Inventor

• Helmut Ringel · Niederzier, DE

Key dates

• Filing date: Jul 8, 1983
• Grant date: Aug 6, 1985
• Expiry date: Jul 8, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2259/402
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

For the separation and recycling of NO.sub.x gas constituents through adstion and desorption on a molecular sieve the molecular sieve is passed through in sequential, alternating process steps. Initially, the NO.sub.x is retained up to saturation of the molecular sieve. Thereafter the molecular sieve is regenerated through the introduction of gas. In order to reduce the demands during scavenging of the molecular sieve, and then to facilitate the provision of a closed separating and recycling system, the molecular sieve for regeneration is heated to a temperature for desorbing the adsorbed NO.sub.x and scavenged with a portion of the waste gas containing the NO.sub.x which is to be cleaned. The scavenging gas flow is recycled after passing through the molecular sieve.