Methanogen substrate for biogas production

Patent metadata

Field	Value
Publication number	US-2017145442-A1
Application number	US-201515313328-A
Country	US
Kind code	A1
Filing date	May 26, 2015
Priority date	May 26, 2014
Publication date	May 25, 2017
Grant date	—

Abstract

The use of a product for internal dehydration of hydrogenated sugar as a methanogen substrate in a method for biogas production, a composition including a monoanhydrohexitol (M), a dianhydrohexitol (D), and anhydrohexitol polymers (P), and a methanisation method.

First claim

1 - 22 . (canceled)

23 . A composition comprising, relative to its dry matter:
up to 50% of at least one monoanhydrohexitol (M) and of at least one dianhydrohexitol (D); at least 50% of anhydrohexitol polymers (P); the sum of the constituents (M)+(D)+(P) coming to 100% and said constituents M and D being present according to an M/(M+D) weight ratio ranging from 0.40 to 0.95.

24 . The composition as claimed in claim 23 , wherein said composition comprises:
from 5% to 50% of at least one monoanhydrohexitol (M) and of at least one dianhydrohexitol (D), in particular from 10% to 50%, advantageously from 25% to 45%, preferably from 30% to 40%; from 50% to 95% of anhydrohexitol polymers (P), in particular from 50% to 90%, advantageously from 55% to 75%, preferentially from 60% to 70%.

25 . The composition as claimed in claim 23 , wherein the constituents (M) and (D) are present according to an (M)/(M+D) weight ratio ranging from 0.42 to 0.90, preferably from 0.45 to 0.85.

26 . The composition as claimed in claim 23 , wherein said composition comprises isosorbide in a weight amount, relative to the total weight of dianhydrohexitols, of at least 90% by weight, advantageously at least 95%.

27 . The composition as claimed in claim 23 , wherein the weight percentage of 1,4-sorbitan optionally present in the composition is, relative to the total amount of monoanhydrohexitols, less than 10%, preferably less than 7%.

28 . The composition as claimed in claim 23 , wherein said composition has a Brookfield viscosity, according to a test A, included in the range of from 200 to 2000 mPa.s, preferably from 250 to 1800 mPa.s, most preferentially from 380 to 1200 mPa.s, the test A consisting in adjusting the dry matter of the composition to 85% and then measuring the Brookfield viscosity at 60° C. of the resulting composition.

29 . The composition as claimed in claim 23 , wherein said composition has a dry matter ranging from 50% to 100%, advantageously from 60% to 95%, preferentially from 65% to 90%.

30 . The composition as claimed in claim 23 , wherein said composition has, relative to its dry matter, an amount of sulfur of less than 3%, advantageously an amount of less than 2%, preferentially from 5 ppm to 1.5% of sulfur.

31 . The composition as claimed in claim 23 , wherein said composition has, according to a test B, a freezing point of less than 10° C., preferentially less than −5° C., most preferentially less than −20° C., the test B consisting in adjusting the dry matter of said composition to 85% and in measuring the freezing point of the composition with the dry matter thus adjusted.

32 . A methanization process comprising:
a step of introduction, into a digester, of a methanogenic substrate comprising a product of internal dehydration of a hydrogenated sugar, in the presence of a microorganism, so as to form a methanogenic medium; a step of anaerobic digestion of the methanogenic substrate at a temperature ranging from 15 to 70° C., preferably from 25 to 45° C., in order to form a biogas; a step of recovery of said biogas, this step possibly being carried out throughout the digestion step.

33 . The process as claimed in claim 32 , wherein the digestion step has a duration ranging up to 8 weeks, preferably from 1 to 6 weeks.

34 . The process as claimed in claim 32 , wherein the dry matter of the methanogenic medium ranges from 0.1% to 50%, advantageously from 1% to 45%.

35 . The process as claimed in claim 32 , wherein a buffer solution is also introduced into the methanogenic medium in order to carry out the anaerobic digestion step.

36 . The process as claimed in claim 32 , wherein a solution of trace elements and/or a solution of macroelements is (are) introduced into the methanogenic medium in order to carry out the anaerobic digestion step.

37 . The process as claimed in claim 32 , wherein the product of internal dehydration of a hydrogenated sugar is a product of internal dehydration of sorbitol.

38 . The process as claimed in claim 32 , wherein the product of internal dehydration of a hydrogenated sugar comprises an anhydrohexitol, an anhydrohexitol polymer or a mixture of these products, the anhydrohexitol preferably being chosen from isosorbide, isomannide, isoidide, sorbitans, mannitans or iditans or any mixtures of at least two of these products.

39 . The process as claimed in claim 32 , wherein the product of internal dehydration of a hydrogenated sugar comprises an amount of sulfur of less than 3%, advantageously an amount of sulfur of less than 2%, preferentially from 5 ppm to 1.5% of sulfur.

40 . The process as claimed in claim 32 , wherein the product of internal dehydration of a hydrogenated sugar is used as a methanogenic substrate together with at least one additional methanogenic matter different than the product of internal dehydration of a hydrogenated sugar, said additional methanogenic matter possibly being waste of agricultural, food-processing, industrial, household or municipal origin.

41 . The process as claimed in claim 32 , wherein the product of internal dehydration of a hydrogenated sugar is a mixture which comprises, relative to its dry matter:
up to 50% of at least one monoanhydrohexitol (M) and of at least one dianhydrohexitol (D), for example from 5% to 50%, in particular from 10% to 50%, advantageously from 25% to 45%, preferably from 30% to 40%; at least 50% of anhydrohexitol polymers (P), for example from 50% to 95%, in particular from 50% to 90%, advantageously from 55% to 75%, preferentially from 60% to 70%; the sum of the constituents (M)+(D)+(P) coming to 100% and said constituents M and D being present according to an M/(M+D) weight ratio ranging from 0.40 to 0.95, advantageously from 0.42 to 0.90, preferably from 0.45 to 0.85.

42 . The process as claimed in claim 32 , wherein the product of internal dehydration of a hydrogenated sugar is a mixture which has a Brookfield viscosity, according to a test A, included in the range of from 200 to 2000 mPa.s, preferably from 250 to 1800 mPa.s, most preferentially from 380 to 1200 mPa.s, the test A consisting in adjusting the dry matter of the composition to 85% and then measuring the Brookfield viscosity at 60° C. of the resulting composition.

43 . The process as claimed in claim 32 , wherein the product of internal dehydration of a hydrogenated sugar has a methane potential greater than 20 milliliters of methane per gram (mLCH 4 /g) of dry matter of said product, advantageously greater than 50 mLCH 4 /g, preferably greater than 110 mLCH 4 /g.

Assignees

• Roquette Freres

Inventors

• Wyart Herve
• Ibert Mathias

Classifications

• C12P5/023 Primary

  Methane · CPC title

• C07D307/20 Primary

  Oxygen atoms · CPC title

• C12N1/20

  Bacteria; Culture media therefor · CPC title

• C07D493/04 Primary

  Ortho-condensed systems · CPC title

• C08G65/34

  from hydroxy compounds or their metallic derivatives {(C08G65/26 takes precedence)} · CPC title