Hydropyrolysis of biomass for producing high quality liquid fuels

Abstract

A self-sustaining process for producing liquid fuels from biomass in which the biomass is hydropyrolyzed in a reactor vessel containing molecular hydrogen and a deoxygenating catalyst, producing a partially deoxygenated pyrolysis liquid, which is hydrogenated using a hydroconversion catalyst, producing a substantially fully deoxygenated pyrolysis liquid and a gaseous mixture comprising CO and light hydrocarbon gases (C1-C4). The gaseous mixture is reformed in a steam reformer, producing reformed molecular hydrogen, which is then introduced into the reactor vessel for hydropyrolizing the biomass. The deoxygenated liquid product is further processed to produce diesel fuel and gasoline.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to an integrated process for thermochemically transforming biomass into high quality liquid fuels. In one aspect, this invention relates to a substantially self-sustaining process for creating high quality liquid fuels from biomass. In another aspect, this invention relates to a multi-stage hydropyrolysis process for creating high quality liquid fuels from biomass. In another aspect, this invention relates to a hydropyrolysis process for transforming biomass into high quality liquid fuels in which all of the process fluids are provided by the biomass. In another aspect, this invention relates to a hydropyrolysis process for transforming biomass into high quality liquid fuels in which the process outputs are substantially only liquid product and CO2.[0003]2. Description of Related Art[0004]Conventional pyrolysis of biomass, typically fast pyrolysis, does not utilize or require H2 or catalysts and p...

AI Technical Summary

Benefits of technology

[0008]Accordingly, it is one object of this invention to provide a self-sustaining, balanced process for conversion of biomass to liquid product using hydropyrolysis. By self-sustaining, we mean that, once initiated, the process requires no input of additional reactants, heat, or energy from external sources.

Problems solved by technology

Pressures greater than about 800 psig result in a higher liquid product yield, which is the driving force behind the operating parameters employed by conventional processes for maximizing liquid product yield; however, such higher pressures also produce higher amounts of water, as a result of which the overall process is driven out of balance, requiring, for example, the introduction of additional hydrogen into the hydropyrolysis reactor vessel from an external source to complete the process.

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