Acid gas enrichment method and system

US10875769B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Thomas Ingram · Keller, US
• Gerald Vorberg · Ludwigshafen, DE
• Georg Sieder · Bad Dürkheim, DE

Key dates

• Filing date: Dec 7, 2016
• Grant date: Dec 29, 2020
• Expiry date: Jan 4, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02C20/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for treating an H2S- and CO2-comprising fluid stream, in which a) the fluid stream is treated in a first absorber at a pressure of 10 to 150 bar with a first substream of a regenerated H2S-selective absorbent to obtain a treated fluid stream and an H2S-laden absorbent; b) the H2S-laden absorbent is heated by indirect heat exchange with regenerated H2S-selective absorbent; c) the heated H2S-laden absorbent is decompressed to a pressure of 1.2 to 10 bar in a low-pressure decompression vessel to obtain a first CO2-rich offgas and a partly regenerated absorbent; d) the partly regenerated absorbent is regenerated in a desorption column to obtain an H2S-rich offgas and regenerated absorbent; e) the H2S-rich offgas is fed to a Claus unit and the offgas from the Claus unit is fed to a hydrogenation unit to obtain hydrogenated Claus tail gas; f) the hydrogenated Claus tail gas and the first CO2-rich offgas are treated in a second absorber at a pressure of 1 to 4 bar with a second substream of the regenerated H2S-selective absorbent to obtain a second CO2-rich offgas and a second H2S-laden absorbent; and g) the second H2S-laden absorbent is guided into the first absorber. Also desc…