Capture of CO₂from hydrogen plants using a temperature swing adsorption method

摘要

The invention involves the use of a temperature swing adsorption process in steam methane reforming or autothermal reforming H2-production processes to capture CO2 and produce nearly pure off gas streams of CO2 for sequestration or enhanced oil recovery (EOR). The hydrogen stream output is substantially pure and can be recycled as a fuel to the steam methane reformer furnace or used in other petroleum and petrochemical processes.

主权项

1. A process of producing substantially pure CO2 for sequestration or enhanced oil recovery (EOR) and substantially pure hydrogen for use as a fuel in steam methane reformer furnace or as a feed source for other hydrocarbon petrochemical reactions, the process comprises mixing steam and natural gas in a steam methane reformer thereafter passing a product to a heat recovery steam generator and subsequently to high and low-temperature shift reactors to create a shifted synthesis gas which is passed to a temperature swing adsorption (TSA) unit cycled so as to produce a substantially pure CO2 stream at a pressure for sequestration or disposal or EOR and a substantially pure H2 product stream for recycling as a fuel into the steam methane reformer furnace or use in other petroleum and petrochemical operations with any remaining methane recycled with makeup natural gas as feed into the steam methane reformer, and wherein the TSA has a first set of beds to process or produce substantially pure CO2 and a second set of beds to process and produce substantially pure H2 with the rest of any gas stream components being recycled to an SMR or used as fuel gas.