Catalytic fast pyrolysis process with impurity removal
First Claim
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1. An improved catalytic fast pyrolysis process comprising steps of:
- a) treating biomass containing alkali and alkaline earth metal components to reduce alkali and alkaline earth metal content to result in treated biomass,b) feeding the treated biomass of step a), catalyst composition, and transport fluid to a catalytic fast pyrolysis process fluidized bed reactor maintained at reaction conditions to manufacture a raw fluid product stream,c) feeding the raw fluid product stream of step b) to a solids separation and stripping system to produce separated solids and a fluid product stream,d) feeding the fluid product stream of step c) to a vapor/liquid separation system to produce a liquid phase stream comprising water and components selected from the group consisting of char, coke, ash, catalyst fines, water soluble organics and heavy organics, and combinations thereof, and a vapor phase stream comprising benzene, toluene xylenes, olefins having carbon numbers of 2 to 4, methane, carbon monoxide, and carbon dioxide, ande) feeding the vapor phase stream of step d) to a product recovery system to recover benzene, toluene, xylenes and, optionally, olefins.
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Abstract
The present invention provides an improved catalytic fast pyrolysis process for increased yield of useful and desirable products. In particular, the process comprises an improved catalytic fast pyrolysis process for producing aromatic compounds, such as, for example, benzene, toluene and xylenes, from biomass feedstock containing impurities, such as, for example alkali and alkaline earth metal, sulfur and nitrogen components.
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Citations
61 Claims
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1. An improved catalytic fast pyrolysis process comprising steps of:
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a) treating biomass containing alkali and alkaline earth metal components to reduce alkali and alkaline earth metal content to result in treated biomass, b) feeding the treated biomass of step a), catalyst composition, and transport fluid to a catalytic fast pyrolysis process fluidized bed reactor maintained at reaction conditions to manufacture a raw fluid product stream, c) feeding the raw fluid product stream of step b) to a solids separation and stripping system to produce separated solids and a fluid product stream, d) feeding the fluid product stream of step c) to a vapor/liquid separation system to produce a liquid phase stream comprising water and components selected from the group consisting of char, coke, ash, catalyst fines, water soluble organics and heavy organics, and combinations thereof, and a vapor phase stream comprising benzene, toluene xylenes, olefins having carbon numbers of 2 to 4, methane, carbon monoxide, and carbon dioxide, and e) feeding the vapor phase stream of step d) to a product recovery system to recover benzene, toluene, xylenes and, optionally, olefins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. An improved catalytic fast pyrolysis process comprising steps of:
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a) treating biomass containing at least 500 ppm alkali and alkaline earth metal components to reduce alkali and alkaline earth metal content to result in treated biomass by a method comprising steps 1) sizing the biomass to ≤
20 cm size particles, 2) washing the sized biomass of step 1) in at least one washing cycle with a washing fluid sufficiently to reduce the content of alkali and alkaline earth metals, including a mass ratio of washing fluid to biomass of at least 5, 3) optionally rinsing the washed biomass of step 2) with rinsing fluid, 4) drying the biomass to reduce water content, and optionally 5) sizing the dried biomass particle size to ≤
1 cm,b) feeding the treated biomass of step a), catalyst composition comprising a crystalline molecular sieve having the structure of ZSM-5, and transport fluid to a catalytic fast pyrolysis process fluidized bed reactor maintained at reaction conditions including a temperature from 300 to 1000°
C., pressure from 100 to 1500 kPa and catalyst- to- biomass mass ratio of from 0.1 and 40 to manufacture a raw fluid product stream,c) feeding the raw fluid product stream of step b) to a solids separation and stripping system to produce separated solids and a fluid product stream, d) feeding the fluid product stream of step c) to a vapor/liquid separation system to produce a liquid phase stream comprising water and components selected from the group consisting of char, coke, ash, catalyst fines, water soluble organics and heavy organics, and combinations thereof, and a vapor phase stream comprising benzene, toluene and xylenes, and e) feeding the vapor phase stream of step d) to a product recovery system to recover benzene, toluene and xylenes. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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Specification