Pile delignification

Patent metadata

Field	Value
Publication number	US-10006167-B2
Application number	US-201515107881-A
Country	US
Kind code	B2
Filing date	Aug 10, 2015
Priority date	Aug 19, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

The present invention relates to a delignification method which is applied for removing lignin from a biomaterial mixture in form of a pile, and essentially comprises the steps of piling of the biomaterials, treating the pile with an irrigation solution comprised of water or an aqueous solution comprising chemical materials, transferring the irrigation solution leached during reaching to the bottom of the pile to a pool or a storage unit with a drainage system, giving the irrigation solution which is transferred to the pool or the storage unit to irrigation again after controlling and optimizing, and leaching the pile by stopping the irrigation when the delignification process ends.

First claim

The invention claimed is:

1. A delignification method for removing lignin from a biomaterial mixture which is in form of a pile, comprising:
piling biomaterials in open air,
treating the piled biomaterials with an irrigation solution which is an aqueous solution comprising chemical materials at atmospheric temperature and atmospheric pressure,
wherein the irrigation solution comprises at least one of the chemical materials: ammonium persulfate, potassium persulfate, and sodium persulfate,
transferring the irrigation solution leached during reaching to the bottom of the pile, to a pool or a storage unit with a drainage system,
recirculating the irrigation solution which is transferred to the pool or the storage unit to the piled biomaterials again after controlling and optimizing at least one of pH, chemical amounts, salinity and ionic force of the irrigation solution by compensating consumed chemical materials, and
leaching the piled biomaterials by stopping the irrigation when the delignification process ends.

2. The delignification method according to claim 1 , wherein the biomaterials wanted to be processed are piled after they are cleaned.

3. The delignification method according to claim 2 , wherein the biomaterials wanted to be processed are piled after they are ground.

4. The delignification method according to claim 3 , wherein the cleaned biomaterials are ground such that the grounded biomaterial will be smaller than 4 cm in all dimensions.

5. The delignification method according to claim 1 , wherein piling the biomaterials takes place where a pile field is formed in a pool or in an area.

6. The delignification method according to claim 5 , wherein the biomaterials are piled on top of each other or into bags and sacks.

7. The delignification method according to claim 6 , wherein the biomaterials are one of, (a) piled directly or (b) piled by mixing at least one of, (i) zeolite and (ii) microorganism in between them.

8. The delignification method according to claim 1 , wherein the irrigation solution is given to the pile by flowing directly from top of the pile to the bottom, from a sprinkler.

9. The delignification method according to claim 8 , wherein the water used for irrigation solution is tap water, well water, sea water, oceanic water, rain water, waste water, distilled water, deionized water.

10. The delignification method according to claim 8 , wherein treating the pile with irrigation solution is done in order to increase one of, the rate and quality of the reaction and wherein air, nitrogen, ozone or oxygen is given to the pile from the bottom, or hydrogen peroxide chemical (H 2 O 2 ) is given onto the pile or into the irrigation solution.

11. The delignification method according to claim 1 , wherein the recirculating of the solution which is cleaned to the irrigation again after lignin and hemicellulose passing to the irrigation solution transferred to pool or storage unit are held with filter and purified.

12. The delignification method according to claim 1 , wherein the pile is washed with water at least once and dried after the leaching of the pile.

13. The delignification method according to claim 12 , wherein the pile is dried in open air.

14. The delignification method according to claim 12 , wherein the delignification ratio is observed once a day.

15. The delignification method according to claim 1 , wherein the solution, obtained in the step of leaching the pile by stopping the irrigation when the delignification process ends, is given to a new pile, cleaned or used as fertilizer or one of the components of the fertilizer.

16. The delignification method according to claim 1 , wherein the method is applied on a cellulose remaining in the pile after the delignification process ends.

17. The delignification method according to claim 1 , wherein the method is applied on the cellulose remaining in the heap after the delignification process ends pile for carboxymethylcellulose and/or bioethanol conversion.

18. The delignification method according to claim 13 , wherein the cellulose is held with a filter and removed from the system in conversions which make the cellulose soluble.

19. A delignification method for removing lignin from a biomaterial mixture which is in form of a pile, comprising:
piling biomaterials in open air wherein the biomaterials are in bags or sacks,
treating the piled biomaterials with an irrigation solution which is an aqueous solution comprising chemical materials at atmospheric temperature and atmospheric pressure,
wherein the irrigation solution comprises at least one of the chemical materials: NaOH, Na 2 CO 3 , NH 4 OH, NaHCO 3 KOH, Mg(OH) 2 , Na 2 S, K 2 S, ammonium persulfate, potassium persulfate, sodium persulfate, sodium hypochlorite, sodium perborate, sodium percarbonate, and hydrogen peroxide chemicals,
transferring the irrigation solution leached during reaching to the bottom of the pile, to a pool or a storage unit with a drainage system,
recirculating the irrigation solution which is transferred to the pool or the storage unit to the piled biomaterials again after controlling and optimizing at least one of pH, chemical amounts, salinity and ionic force of the irrigation solution by compensating consumed chemical materials, and
leaching the piled biomaterials by stopping the irrigation when the delignification process ends.

Assignees

• Univ Istanbul Teknik

Inventors

• Atici Oya
• Tezcan Erdem

Classifications

• D21C1/10

  Physical methods for facilitating impregnation · CPC title

• D21C9/083

  with inorganic compounds (D21C9/086 takes precedence) · CPC title

• D21C3/02 Primary

  with inorganic bases or alkaline reacting compounds, e.g. sulfate processes · CPC title

• D21C9/02

  Washing {; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents} · CPC title

• D21C11/0007

  Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for (volatile compounds obtained by decomposition of spent liquors in order to regenerate them D21C11/125; compounds obtained by fractionating the liquors in order to regenerate them D21C11/0042) · CPC title