A High-Efficiency Gasification/Oxy-Combustion Process to Produce Methanol and Hydrogen with Near Zero CO2 Emissions
Publication Date: 2004-Nov-24
The IP.com Prior Art Database
A High-Efficiency Gasification/Oxy-combustion Process to Produce Methanol and hydrogen with near zero CO2 Emissions
This invention proposes a novel process to co-produce hydrogen and methanol from biomass or fossil fuels using oxygen blown gasification and oxy-combustion. The CO2 generated in the process is reacted with hydrogen to produce methanol, the hydrogen preferably being from waste or by-product streams of other processes. Methanol may be used, either directly or by converting to hydrogen, in fuel cells. Methanol may also be used to produce other high value products such as acetic acid, formaldehyde, MTBE, and as a clean fuel to power plants. Maximum CO2 conversion to methanol with H2 is targeted through optimized catalyst composition and reaction conditions, avoiding costly CO2 sequestration.
The present invention relates to a process to produce hydrogen and methanol from biomass and fossil fuels, producing combined heat and power with near zero CO2 emissions.
The purpose of this invention is to promote an efficient process to produce methanol from biomass and/or solid fossil fuels with flexibility to produce high purity hydrogen, while generating combined heat and power. The proposed process maximizes the conversion of CO2 generated to produce methanol with waste streams containing hydrogen. Methanol can be further processed to produce high value products such as acetic acid, formaldehyde and MTBE or used as a clean fuel in power plants.
The characteristics and advantages of the present invention will be apparent to those skilled in the art from the detailed description of the preferred embodiments, which are discussed below with reference to the attached drawings.
During gasification and combustion of biomass and/or fossil fuels, large quantities of CO2, which is a greenhouse gas, are generated. Recent data on global warming indicates that the emissions of CO2, being the major greenhouse gas, must be mitigated to reduce or slow down the rate of global warming. A lot of effort is focused on finding ways for CO2 capture and sequestration. However, significant research is still needed before such technology becomes economically viable. A better option is to use the CO2 and hydrogen, either generated during the gasification/combustion of bio-mass/fossil fuels or from other H2 generating processes, to produce liquid Methanol. The syngas generated by partial oxidation (POX) process normally has a much lower H2/(CO+CO2) ratio than that is required by methanol synthesis reaction [requires a (H2+CO2)/(CO+CO2) around 2.05]. Thus to convert all carbon in CO2 into methanol some make up hydrogen is needed to overcome the H2 deficiency. The additional H2 may be obtained from sources such as refinery offgas, coke oven gas, ethylene crackers, and Steam methane reformers, etc. The process is flexible in the regard that the amount of additional H2 needed may be...