Process for enhancing process performance during the thermocatalytic treatment of biomass
A process for enhancing the conversion of biomass into a bio-oil containing liquid feed wherein the processability index, PI, of the biomass is optimized prior to introducing the biomass into the biomass conversion unit where catalytic pyrolysis of the biomass occurs. The PI is dependent on the ratio (S/G) between the S-unit population and the G-unit population of the biomass as well as the weight percent acetate, the weight percent alkaline (Group I metals), the weight percent of non-metals in the biomass of Group 15, Group 16 and Group 17 elements, the weight percent of metalloids (Group 13 and Group 14 elements), the weight percent xylan and the weight percent of alkaline earth (Group II metals) in the biomass feedstream.
1. A process of improving the efficiency of catalytic pyrolysis of a lignin containing biomass feedstream, the process comprising:
(a) subjecting a biomass feedstream having a predetermined processability index, PI, in excess of 15 to physical processing, wherein
PI
=
100
*
(
S
G
)
*
(
%
acetate
)
*
(
Alkaline
+
Non
-
metal
+
Metalloids
)
2
(
%
xylan
)
*
(
Alkaline
Earth
)
(
I
)
where parameters:
S/G is the ratio between S-units and G-units in the lignin of the biomass feedstream;
% acetate is the weight percent of acetate in the biomass feedstream;
alkaline is the total amount of Group 1 metals in the biomass feedstream, in weight percent;
non-metal is the amount of Group 15, Group 16 and Group 17 elements in the biomass feedstream, in weight percent;
metalloids is the amount of Group 13 and Group 14 elements in the biomass feedstream, in weight percent;
% xylan is the weight percentage of xylan component in the biomass feedstream, in weight percent;
alkaline earth is the total amount of Group 2 metals in the biomass feedstream, in weight percent; and further wherein
the physical processing comprises at least one of the following:
(i) demineralizing the biomass feedstream by washing in an aqueous media or in a solvent;
(ii) subjecting a fluid containing the biomass feedstream to pressure and breaking the biomass feedstream apart upon release of the pressure;
(iii) soaking the biomass feedstream in an aqueous fluid or in a solvent;
(iv) swelling the biomass feedstream in an aqueous fluid or in a solvent;
(v) grinding the biomass feedstream to a smaller particle size;
(vi) blending the biomass feedstream with a second biomass feed wherein the PI of the second biomass feed is less than the PI of the biomass feedstream;
(vii) drying the biomass feedstream;
(viii) agitating the biomass feedstream;
(ix) steaming the biomass feedstream;
(x) fractionating the biomass feedstream;
(xi) extracting the biomass feedstream; or
(xii) impregnating the biomass feedstream with an acid, base or salt or a combination thereof;
(b) introducing the treated biomass of step (a) to an analyzer and assessing the composition of the treated biomass;
(c) relaying the assessed treated biomass of step (b) into a controller and optimizing the parameters in (I) for PI;
(d) determining the PI of the treated biomass from the optimized parameters;
(e) repeating (i) the physical processing defined in step (a) and (ii) steps (b) to (d) until the PI of the treated biomass is less than or equal to 15; and
(f) introducing the treated biomass of step (e) having PI less than or equal to 15 to a biomass conversion reactor and subjecting the treated biomass to catalytic pyrolysis in the biomass conversion reactor.
2. The process of claim 1 , wherein the PI of the treated biomass introduced into the biomass conversion reactor in step (f) is less than 10.
3. The process of claim 1 , wherein the PI of the treated biomass introduced into the biomass conversion reactor in step (f) is less than 8.
4. The process of claim 1 , wherein the Group 1 metal is lithium, sodium, potassium, or combination thereof.
5. The process of claim 1 , wherein the Group 2 metal is magnesium, calcium, strontium, or combination thereof.
6. The process of claim 1 , wherein the metalloid is silicon, aluminum, tin, lead, or combination thereof.
7. The process of claim 1 , wherein the non-metal is phosphorus, sulfur, arsenic, antimony, selenium, fluorine, chlorine, bromine, or a combination thereof.
8. The process of claim 1 , wherein the biomass feedstream comprises cellulose.
9. The process of claim 1 , wherein the biomass feedstream comprises a lignocellulosic material.
10. The process of claim 9 , wherein the lignocellulosic material is hardwood, hardwood derivatives, hardwood forest residues, hardwood whole trees or a combination thereof.
11. The process of claim 9 , wherein the lignocellulosic material is softwood, softwood derivatives, softwood forest residues, softwood whole trees or a combination thereof.
12. The process of claim 9 , wherein the lignocellulosic material is herbaceous biomass, herbaceous biomass derivatives, herbaceous biomass residues or a combination thereof.
13. The process of claim 1 , wherein the physical processing which the biomass feedstream is subjected in step (a) is grinding, demineralization, drying, or a combination thereof.
14. The process of claim 13 , wherein the drying is carried out by flash drying, vacuum drying, or combination thereof.
15. The process of claim 1 , wherein the physical processing which the biomass feedstream is subjected in step (a) is demineralizing by washing in an aqueous media or in a solvent.
16. The process of claim 15 , wherein the aqueous media is generated in-situ in a system integrated with the biomass conversion reactor.
17. The process of claim 1 , wherein the physical processing which the biomass feedstream is subjected in step (a) is contacting with a fluid under pressure and wherein the biomass is broken apart upon release of the pressure.
18. The process of claim 1 , wherein the physical processing which the biomass feedstream is subjected in step (a) is swelling in the presence of an aqueous fluid or solvent.
19. The process of claim 1 , wherein the treated biomass is subjected to catalytic pyrolysis in step (f) in the presence of nitrogen, carbon dioxide, steam, hydrogen or carbon monoxide.
20. The process of claim 1 , wherein the analyzer is high-performance liquid chromatography, negative ion electrospray and/or mass spectrometry.
21. The process of claim 1 , wherein the composition determined by the analyzer in step (b) is the lignin content, mineral content, carbon content, hydrogen content, oxygen content, natural oil content, and hemicellulose content, cellulose content, extractives content, water content, and/or ratio of any of the same.
22. The process of claim 1 , wherein the biomass feed in step (f) is subjected to catalytic pyrolysis in an oxygen-poor or substantially oxygen free atmosphere.