JPWO2021133435A5 - - Google Patents

Description

US Patent Application Publication No. US2017/0275817 relates to a continuous process of soaking a lignocellulosic biomass stream in an extraction solution comprising water and dissolved water-soluble species derived from previously treated lignocellulosic biomass. In this process, water-insoluble contaminants are separated according to their apparent mass density. The stream of lignocellulosic biomass may further be subjected to a second optional soaking step in a countercurrent configuration. The disclosed process is useful for removing non-lignocellulosic water-soluble compounds from lignocellulosic biomass with reduced water consumption.
Prior art document information related to the invention of this application includes the following (including documents cited in the international phase after the international filing date and documents cited when entering the national phase in other countries).
(Prior art document)
(Patent document)
(Patent Document 1) U.S. Pat. No. 4,087,936
(Patent Document 2) JP-A-2005-205336
(Patent Document 3) US Patent Application Publication No. 2019/248962
(Patent Document 4) Chinese Patent Application Publication No. 101870542
(Patent Document 5) US Patent Application Publication No. 2015/166681
(Non-Patent Literature)
(Non-Patent Document 1) S.M. R. G. OUDENHOVEN ET AL, "Using pyrolytic acid leaching as a pretreatment step in a biomass fast pyrolysis plant: Process design and economic evaluation", BIOMASS AND BIOENERGY, Vol. 95, 01 December 2016 (2016-12-01), page 388-404

Claims (14)

a series of solids washing steps for removing alkali and alkaline earth elements in a series of washing tanks comprising an agitation device and containing a washing solution, wherein the solid biomass is contacted with said washing solution in countercurrent flow; A countercurrent washing process for washing solid biomass, wherein said solids are transported as a slurry from at least one washing vessel via a pneumatic lift pump to a second washing vessel or other device. The process of claim 1, wherein the slurry of solids in the wash solution is 0.1 wt% to 30 wt% solids. 3. The process of claim 1, wherein the slurry has at least 85% by weight, or at least 90% by weight, or at least 95% by weight of the particles are 0.25 inch (0.6 cm), or 0.5 inch (1.5 cm). 2 cm), or 1.0 inch (2.5 cm), or 1.5 inch (3.7 cm), or 2 inch (5.0 cm) screen. The process of claim 1, wherein at least 85 wt%, or at least 90 wt%, or at least 95 wt% of the particles are cellulose particles having an aspect ratio (ratio of length to width) of at least 2:1. A process having a system biomass feed. 3. The process of claim 1, wherein the at least one wash solution is 5 or less, or 4 or less, or 3.5 or less, or 3.0 or less, or 2.5 or less, or 2.3 or less, or 2.0 or less, or 1.7 or less, or 1.5 or less, or in the range of 1.5 to 5, or 2.0 to 5.0, or 2.0 to 3.5, or 2.5 to 3.0 A process having a pH of The process of claim 1 , wherein
a . Said pneumatic lift has a hole size in the sparger that supplies gas to the air lift pump with a ratio of transport cross-sectional area perpendicular to the lift to hole area of 144-3600 and a minimum hole size of 0.1 inch (2. 54 mm), up to 0.5 inch (12.7 mm), said holes being spaced at least 3 hole diameters apart;
b. the gas used for said pneumatic pumping is selected from among air, nitrogen, carbon dioxide, or cooled flue gas, or mixtures thereof;
process. 3. The process of claim 1, wherein the solids are separated from the liquid by sidehill screens, screw presses, or both sidehill screens and screw presses to produce washed biomass. The process of claim 1, wherein the cleaning fluid is water, acidified water, alkaline water, process water produced in a biomass upgrading process, water from a quench tower, water from a quench scrubber, water from a biomass drying process. , acetic acid, formic acid, nitric acid, carbonic acid, sulfuric acid, phosphoric acid, hydrochloric acid, ammonium salts, alkylammonium salts, arylammonium salts, aqueous solutions of polyols, carbon dioxide, ammonia, steam, preferably wet steam, at least partly liquid phase Non-aqueous solvents such as methanol, ethanol, other alcohols, other oxyacids, mixtures of solvents in water, alcohols, ketones, ethers, acids, esters, amines, amides, nitriles, thiols, thioethers, thiophenes or a portion of the aqueous solution from the biomass remediation process, which may contain a wide range of components such as compounds extracted from the solids in the washing step, or mixtures thereof; a portion of the optionally treated and recycled spent washing solution; A process that may be selected from the group having an aqueous phase exposed to gaseous combustion products comprising a component selected from the group such as NO, NO2, CO2, or combinations thereof, or combinations thereof. A process for preparing a solid raw material, said process comprising:
a. a solid pulverization step for reducing the size of the raw material particles;
b. a series of solids washing steps operating as a stirred tank in which said reduced-size solids are contacted with washing solution in a countercurrent manner;
c. at least one airlift pump for transporting a slurry of the raw material particles in the cleaning solution from one tank to another;
d. a solids separation step in which the solids are mechanically separated from the wash solution;
e. optionally drying the solid; and
f. and recovering said solid. 10. The process of claim 9 , wherein said solids separation step comprises a mechanical expeller. In the process according to claim 1 or claim 9 , the air lift (pneumatic lift) removes gas near the bottom (a position or positions within 1/5 or 1/10 by volume from the bottom of the tank), A process that operates by injecting a tube or tubes such that biomass is forced up through the tube or tubes and out of the vessel. An apparatus for washing solid biomass for conversion to high value products, comprising:
a. two wash tanks with an inlet port or ports for introducing solid biomass or liquid or a mixture of the two and means for agitating said solid biomass and liquid mixture;
b. a pneumatic lift pump having a transport gas source, a transfer tube, and a sparger for introducing the gas to the mixture in the transfer tube;
c. one or more mechanical means for separating solids and liquids in the outlet mixture from said pneumatic lift pump; and
d. and a drying device for removing water from the washed biomass. a biomass composition, preferably a woody biomass composition, comprising 5-20 mg/kg K, 5-45 mg/kg Ca, a Ca/K ratio of 1.5 or less and Mg less than 10 mg/kg, or 6-17 mg/kg K, 6-36 mg/kg Ca, or 26-36 mg/kg Ca, or 1-9 mg/kg Mg, or 4-9 mg/kg Mg, or 6-9 mg/kg A biomass composition having a ratio of Mg, 1.3 or less, or 1-2 or less, or in the range of 1-1.5. 14. The biomass of claim 13 , wherein at least 85 wt%, or at least 90 wt%, or at least 95 wt% of the particles have an aspect ratio (ratio of length to width) of at least 2:1 .