Process for producing BTX by catalytic pyrolysis from biomass without recycling oxygenated compounds

Patent metadata

Field	Value
Publication number	US-10961464-B2
Application number	US-201716305776-A
Country	US
Kind code	B2
Filing date	May 3, 2017
Priority date	May 31, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A process for producing BTX and alcohols from biomass, comprising at least a) catalytic pyrolysis of said biomass in a fluidized-bed reactor producing a gaseous pyrolysis effluent; b) separation of said gaseous pyrolysis effluent into at least one BTX fraction and a gaseous effluent comprising at least carbon monoxide and carbon dioxide, c) recycling at least part of said gaseous effluent comprising at least carbon monoxide and carbon dioxide into the reactor of said step a), d) purging said gaseous effluent recycled according to step c) to produce a purge effluent, e) sending at least part of said purge effluent from step d) into a fermentation step producing a liquid fermentation stream comprising at least one stream comprising at least one oxygenated compound chosen from alcohols, diols, acid alcohols, carboxylic acids, aldehydes, ketones and esters, alone or as a mixture.

First claim

The invention claimed is:

1. Process for producing benzene, toluene, o- and p-xylene (BTX) and alcohols from biomass, comprising at least the following steps:
a) conducting catalytic pyrolysis of said biomass in a fluidized-bed reactor producing a gaseous pyrolysis effluent,
b) separating said gaseous pyrolysis effluent into at least one BTX fraction and a gaseous effluent comprising at least carbon monoxide and carbon dioxide,
c) recycling at least part of said gaseous effluent comprising at least carbon monoxide and carbon dioxide into the reactor of said step a),
d) purging said gaseous effluent recycled according to step c) to produce a purge effluent,
e) sending at least part of said purge effluent from step d) into a fermentation step producing a liquid fermentation stream comprising at least one stream comprising at least one oxygenated compound selected from the group consisting of an alcohol containing 2 to 6 carbon atoms, a diol containing 2 to 4 carbon atoms, an acid alcohol containing 2 to 4 carbon atoms, a carboxylic acid containing 2 to 6 carbon atoms, an aldehyde containing 2 to 12 carbon atoms, a ketone containing 3 to 12 carbon atoms, an ester containing 2 to 12 carbon atoms, and mixtures thereof, and
wherein the stream comprises at least one oxygenated compound selected from the group consisting of ethanol, n-propanol, isopropanol, butanol, isobutanol, hexanol, butyric acid, hexanoic acid, lactic acid, acetone, butanone and 2,3-butylene glycol (2,3-butanediol), alone or as a mixture.

2. Process according to claim 1 , in which the catalytic pyrolysis step a) takes place in the presence of a zeolite catalyst comprising at least one zeolite selected from the group consisting of Zeolite Socony Mobil (ZSM)-5, ferrierite, zeolite beta, zeolite Y, mordenite, ZSM-23, ZSM-57, EU-1 and ZSM-11, whether or not doped with a metal selected from the group consisting of iron, gallium, zinc and lanthanum.

3. Process according to claim 1 , in which the catalytic pyrolysis step a) is performed at a temperature of between 400 and 1000° C., at an absolute pressure of between 0.1 and 0.5 MPa and at a weight hourly space velocity (WHSV) of between 0.01 and 10 h −1 .

4. Process according to claim 1 , in which said fermentation step e) is performed in the presence of at least one microorganism chosen from the following microorganism selected from the group consisting of Acetogenium kivui, Acetoanaerobium noterae, Acetobacterium woodii, Alkalibaculum bacchi CP11 (ATCC BAA-1772), Blautia producta, Butyribacterium methylotrophicum, Caldanaerobacter subterraneous, Caldanaerobacter pacificus subterraneous, hydrogenoformans Carboxydothermus, Clostridium aceticum, Clostridium acetobutylicum, Clostridium acetobutylicum P262 (DSM 19630 from DSMZ Germany), Clostridium autoethanogenum (DSM 19630 from DSMZ Germany), Clostridium autoethanogenum (DSM 10061 from DSMZ Germany), Clostridium autoethanogenum (DSM 23693 from DSMZ Germany), Clostridium autoethanogenum (DSM 24138 from DSMZ Germany), Clostridium carboxidivorans P7 (ATCC PTA-7827), Clostridium coskatii (ATCC PTA-10522), Clostridium drakei, Clostridium ljungdahlii PETC (ATCC 49587), Clostridium ERI2 ljungdahlii (ATCC 55380), Clostridium ljungdahlii C-01 (ATCC 55988), Clostridium ljungdahlii O-52 (ATCC 55889), Clostridium magnum, Clostridium pasteurianum (DSM 525 from DSMZ Germany), Clostridium ragsdali P11 (ATCC BAA-622), Clostridium scatologenes, Clostridium thermoaceticum, Clostridium ultunense, Desulfotomaculum kuznetsovii, Eubacterium limosum, sulfurreducens Geobacter, Methanosarcina acetivorans, Methanosarcina Barken, Morrella thermoacetica, Morrella thermoautotrophica, Oxobacter pfennigii, Peptostreptococcus productus, Ruminococcus productus, Thermoanaerobacter kivui , and mixtures thereof.

5. Process according to claim 4 , in which the microorganisms are chosen from Clostridium autoethanogenum, Clostridium ljungdahlii, Clostridium aceticum, Morella thermoacetica, Acetobacterium woodii and Alkalibaculum bacchi for producing ethanol and/or acetate, Clostridium autoethanogenum, Clostridium ljungdahlii and C. ragdalei for producing 2,3-butanediol and Clostridium carboxidivorans, Clostridium drakei, Clostridium scatologenes or Butyribacterium methylotrophicum for producing butyrate and butanol; cultures comprising a mixture of two or more microorganisms may also be used.

6. Process according to claim 1 , in which said fermentation step e) is performed at a growth temperature of between 20 and 80° C., at an absolute pressure of between 0.1 and 0.4 MPa and at a pH of between 3 and 9.

7. Process according to claim 1 , further comprising introducing a hydrogen supplement into said fermentation of step e).

8. Process according to claim 1 , further comprising f) separating said fermentation stream obtained after step e) into at least stream comprising at least one oxygenated compound, an aqueous fraction and an unreacted gaseous effluent.

9. Process according to claim 8 , in which said separation step f) is performed using the steam originating from the catalytic pyrolysis step a).

10. Process according to claim 8 , in which said stream of oxygenated compounds separated out on conclusion of step e) is not recycled into catalytic pyrolysis step a).

Assignees

• Ifp Energies Now

Inventors

• Feugnet Frederic
• Lopes Ferreira Nicolas
• Kasztelan Slavik

Classifications

• C10G1/002 Primary

  in combination with oil conversion- or refining processes · CPC title

• B01J29/7046

  MTT-type, e.g. ZSM-23, KZ-1, ISI-4 or EU-13 · CPC title

• C10G2400/30

  Aromatics · CPC title

• C12P7/16

  Butanols · CPC title

• Y02E50/10

  Biofuels, e.g. bio-diesel · CPC title