EP2794583A1 - Improved method for selectively oxidizing 5-hydroxymethyl furaldehyde - Google Patents
Improved method for selectively oxidizing 5-hydroxymethyl furaldehydeInfo
- Publication number
- EP2794583A1 EP2794583A1 EP12819081.6A EP12819081A EP2794583A1 EP 2794583 A1 EP2794583 A1 EP 2794583A1 EP 12819081 A EP12819081 A EP 12819081A EP 2794583 A1 EP2794583 A1 EP 2794583A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hmf
- process according
- oxidation
- weight
- oxygen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 63
- 230000001590 oxidative effect Effects 0.000 title abstract description 6
- 230000003647 oxidation Effects 0.000 claims abstract description 45
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 45
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 26
- YLFIGGHWWPSIEG-UHFFFAOYSA-N aminoxyl Chemical compound [O]N YLFIGGHWWPSIEG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 150000007524 organic acids Chemical class 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims description 55
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 238000002425 crystallisation Methods 0.000 claims description 18
- 230000008025 crystallization Effects 0.000 claims description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical class O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- QYTDEUPAUMOIOP-UHFFFAOYSA-N TEMPO Chemical group CC1(C)CCCC(C)(C)N1[O] QYTDEUPAUMOIOP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011541 reaction mixture Substances 0.000 claims description 5
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 2
- 235000019260 propionic acid Nutrition 0.000 claims description 2
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 2
- 235000005985 organic acids Nutrition 0.000 claims 1
- 239000002609 medium Substances 0.000 description 11
- 238000003756 stirring Methods 0.000 description 11
- CHTHALBTIRVDBM-UHFFFAOYSA-N furan-2,5-dicarboxylic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)O1 CHTHALBTIRVDBM-UHFFFAOYSA-N 0.000 description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 9
- 239000007795 chemical reaction product Substances 0.000 description 9
- 229910017604 nitric acid Inorganic materials 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 239000003426 co-catalyst Substances 0.000 description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000012429 reaction media Substances 0.000 description 6
- 229910002651 NO3 Inorganic materials 0.000 description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 5
- 150000001299 aldehydes Chemical class 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- -1 tetramethylpiperidin-1-yl Chemical group 0.000 description 5
- PXJJKVNIMAZHCB-UHFFFAOYSA-N 2,5-diformylfuran Chemical compound O=CC1=CC=C(C=O)O1 PXJJKVNIMAZHCB-UHFFFAOYSA-N 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000007810 chemical reaction solvent Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 3
- SHNRXUWGUKDPMA-UHFFFAOYSA-N 5-formyl-2-furoic acid Chemical compound OC(=O)C1=CC=C(C=O)O1 SHNRXUWGUKDPMA-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 235000019253 formic acid Nutrition 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 241000722921 Tulipa gesneriana Species 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001735 carboxylic acids Chemical group 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 125000000623 heterocyclic group Chemical group 0.000 description 2
- 238000007210 heterogeneous catalysis Methods 0.000 description 2
- 238000007172 homogeneous catalysis Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000036284 oxygen consumption Effects 0.000 description 2
- 239000002952 polymeric resin Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 150000003138 primary alcohols Chemical group 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- 229930091371 Fructose Natural products 0.000 description 1
- 239000005715 Fructose Substances 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000005210 alkyl ammonium group Chemical group 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- ODUCDPQEXGNKDN-UHFFFAOYSA-N nitroxyl Chemical compound O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 150000003057 platinum Chemical class 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- YBCAZPLXEGKKFM-UHFFFAOYSA-K ruthenium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Ru+3] YBCAZPLXEGKKFM-UHFFFAOYSA-K 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D307/38—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D307/40—Radicals substituted by oxygen atoms
- C07D307/46—Doubly bound oxygen atoms, or two oxygen atoms singly bound to the same carbon atom
- C07D307/48—Furfural
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D307/38—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D307/40—Radicals substituted by oxygen atoms
- C07D307/46—Doubly bound oxygen atoms, or two oxygen atoms singly bound to the same carbon atom
Definitions
- the present invention relates to a novel process for the oxidation of 5-hydroxymethyl furaldehyde (5-HMF).
- the oxidation product of 5-HMF selectively formed at the end of this process is furan-2,5-dialdehyde or 2,5-diformylfuran (FDF).
- 5-HMF is an organic compound derived in particular from C6 oses such as fructose and glucose. It consists of a furanic heterocycle and has two functional groups, one aldehyde and the other alcoholic.
- FDCA 2,5-furan dicarboxylic acid
- 5-HMF has the major disadvantage of not being stable especially at high temperatures. This generally results in low purity of the oxidation products, even if selective, of 5-HMF. Despite this disadvantage, the oxidation processes of 5-HMF have been widely studied.
- patent FR 2,669,634 relates to a catalytic oxidation process of 5-HMF leading to the synthesis of FDCA. This process consists in oxidizing 5-HMF in alkaline aqueous medium under an oxygen stream in the presence of a lead-activated platinum-based catalyst. The oxidation process selectively leads to FDCA in the form of a salt.
- Such a process in alkaline medium therefore has, first and foremost, the major disadvantage of generating large quantities of salts and is therefore difficult to industrialize.
- the Applicant was therefore specifically interested in the oxidation processes of 5-HMF in an acid medium. Moreover, the applicant company, seeking to obtain high purity products without the addition of subsequent steps, generally expensive, separation or complex purification, was interested in selective oxidation processes of 5-HMF.
- Heterogeneous catalysis is usually characterized by the use of precious metals fixed on various supports. This type of catalysis is particularly sensitive to the impurities contained in the oxidation medium. It is therefore essential, for the process to be industrially acceptable, to work with high purity reagents so that the catalyst support, or even the catalyst itself, is not deactivated by poisoning the active sites.
- Cottier et al. J. Heterocyclic Chem (1995), vol 32, No. 3, pp 927-930 discloses various types of methods of preparing FDF. The processes with the best yields are those carried out in a basic medium, with the presence of co-oxidants other than oxygen and a catalyst such as (2, 2, 6, 6-tetramethylpiperidin-1-yl) oxyl, named hereinafter Tempo. Acidic acid catalysts are also described but, under such conditions, the amount of catalyst required is extremely high (Tempo / 5-HMF molar ratio of 2/10), and these catalysts also require the presence of a co-polymer. metal type oxidant.
- the subject of the present invention is a process for the oxidation of 5-HMF, characterized in that it comprises an oxidation step in the presence of at least one organic acid, a nitroxyl radical, an oxygen source and a transfer agent. oxygen.
- the oxidation process of 5-HMF according to the invention has the advantage of allowing the preparation of DFF from 5-HMF at a high conversion rate and at a particularly high yield and selectivity.
- the oxidation process of the present invention can be carried out in all types of batch reactors or fixed bed, under pressure or not.
- the type of batch reactor may be an autoclave equipped with a variable speed stirrer and a double pale helical system.
- the reactor is further provided with a gas inlet tube, connected to a pressurized system provided with an expander, and a gas evacuation tube.
- the reactor may further comprise a cooling system and also a system for measuring and regulating the temperature.
- the 5-HMF used in the process which is the subject of the invention can be obtained according to any technique known to those skilled in the art, in particular obtained according to the teaching of documents FR 2 551 754, FR 2 464 260 and WO 2011/124639. . It may also be the reaction crude as described in the documents cited above, said reaction crude being simply separated from the reaction solvent. Indeed, according to the process of the present invention, it is not necessary, to obtain a high purity DFF at the end of the process, from a purified 5-HMF.
- the term "high purity FDF” is understood herein to mean a DFF of purity greater than 90%, preferably greater than 95% and more preferably greater than 98%.
- the organic acid used in the process which is the subject of the invention may be any organic acid, with the exception of those having a reducing function, in particular excluding formic acid. Indeed, this organic acid is used as a solvent and must therefore be stable under the conditions of the process.
- the organic acid used in the process which is the subject of the invention may in particular be an organic aliphatic acid which is liquid at room temperature other than formic acid. Preferably, it is chosen from acetic acid and propionic acid.
- the organic acid is advantageously present in a proportion of 50% to 99% by weight of the reaction mixture, preferably 70% to 90% by weight of the reaction mixture.
- the nitroxyl radical is preferably chosen from (2,2,6,6-tetramethylpiperidin-1-yl) oxyl, hereinafter referred to as Tempo, which may or may not be substituted. More preferably, the nitroxyl radical is a (2, 2, 6, 6-tetramethylpiperidin-1-yl) oxyl substituted at the 4-position, more preferably still it is 4-acetoamino- (2, 2, 6, 6). tetramethylpiperidin-1-yl) oxyl or 4AA Tempo.
- the Tempo used in the process of the present invention may be immobilized or not. In the case of an immobilized Tempo, it is advantageously fixed in position 4 on polymeric resin.
- the nitroxyl radical is advantageously present in a catalytic amount.
- the nitroxyl radical is present in a proportion of 0.01 to 15% by weight relative to the weight of 5-HMF, preferably 1 to 10% by weight relative to the weight of 5-HMF, more preferably still 2 to 5 % by weight relative to the weight of 5-HMF.
- the oxygen source is preferably selected from air and molecular oxygen under pressure and / or under flow.
- the oxygen transfer agent is advantageously chosen from nitrogen oxide derivatives.
- Nitrogen oxide derivatives are preferably selected from the sources of nitrate, nitric oxide (NO) and nitrogen dioxide (NO 2 ).
- nitrate sources include nitric acid, ammonium nitrate, alkyl ammonium nitrates, alkaline or alkaline earth nitrates.
- one or more nitrogen oxide derivatives can be used in the oxidation process.
- the nitrogen oxide derivative is nitric acid.
- the nitrate source is advantageously present at a ratio of nitrate / nitroxyl source ratio of from 0.5: 1 to 40: 1 in the reaction mixture, preferably from a source ratio of nitrate / nitroxyl radical of 3/1 to 10/1 in the reaction mixture.
- the ratios between the reagents of the oxidation process according to the invention are established so as to have 2.1% of 4AA Tempo by weight relative to the weight of 5-HMF, a 5-HMF / acetic acid molar ratio of about 0.05 and a molar ratio of HNO 3 / 4AA Tempo of 4.
- the process according to the invention can be carried out in the absence or in the presence of water. If the process is carried out in the presence of water, it is then present at a rate of at most 200% by weight relative to 5-HMF, preferably at most 50% by weight relative to 5-HMF.
- the reactants are placed in the reactor, the latter being advantageously purged at least once under pressure.
- the purge can for example be carried out at 0.3 MPa oxygen.
- the reactor is then heated.
- the heating can advantageously be carried out under oxygen pressure, preferably under 0.01 to 5 MPa of oxygen.
- the reaction medium is stirred.
- the stirring speed is preferably set between 800 and 2200 rpm, more preferably between 1500 and 1700 rpm.
- the oxygen pressure is adjusted to a reaction atmosphere pressure of between 0.01 MPa and 5 MPa, preferably between 0.degree. , 1 MPa and 2 MPa, more preferably between 0.2 and 0.5 MPa.
- Oxygen consumption during the first oxidation step of the process according to the invention generally starts at 80 ° C.
- the temperature during the first oxidation step is regulated between 50 ° C. and 150 ° C., preferably between 70 ° C. and 110 ° C., more preferably still between 80 ° C. and 90 ° C.
- the first oxidation step of the process according to the invention lasts from 1 minute to 5 hours, preferably from 30 minutes to 2 hours.
- the reactor is cooled down, for example by simply cutting off the heating with removal of the heating cap, without using the cooling loop.
- the stirring is completely stopped and the pressure is brought back to atmospheric pressure.
- the oxidation process of 5-HMF according to the invention is particularly advantageous since it allows the selective preparation of FDF at a high yield.
- the oxidation selectivity of 5-HMF to DFF during the first oxidation step is preferably from 80 to 100%, more preferably from 90 to 100%.
- the crude reaction product containing the DFF may also contain a certain number of co-products (mentioned under this term in the examples). This is usually my products overoxidation of 5-HMF, in particular, FFCA and / or FDCA.
- the process according to the invention further comprises, after the first oxidation step, a crystallization step.
- acetic acid is a good solvent for crystallizing DFF.
- the crystallization step may be carried out directly in the reactor or in another apparatus, in particular during a continuous process.
- this other apparatus may be a thermostatic crystallizer double jacket provided with a stirring system.
- the stirring speed is advantageously set at a low speed, preferably at a speed of between 80 rpm and 250 rpm.
- the temperature is lowered gradually during the crystallization step, preferably down in a temperature ramp of 10 ° C / h.
- a very low temperature of the order of ten degrees, is maintained.
- the temperature is maintained at 10 to 15 ° C for about one hour with stirring.
- the medium is then advantageously filtered.
- it may be a vacuum filtration filter tulip.
- the crystals thus obtained during this step are then dried during an additional drying step, for example in a vacuum desiccator at room temperature.
- the oxidation process of 5-HMF according to the invention is particularly advantageous since it makes it possible to obtain high purity DFF from a low purity 5-HMF.
- Low purity 5-HMF means a 5-HMF from a crude process reaction of the prior art, said reaction crude being simply separated from the reaction solvent.
- the dried crystals have a DFF purity greater than 90% by weight, preferably greater than 95% by weight, more preferably still greater than 98% by weight.
- the ratios are established so as to have 2.1% by weight of 4AA Tempo, 5% molar of nitric acid with respect to 5-HMF.
- the ratio HN0 3 / 4AA Tempo is therefore 4.
- the autoclave After one hour of contact time, the autoclave is cooled down by simply cutting off the heating with removal of the heating cap without circulation of water in the cooling loop (prevents crystallization of the DFF on the coil). Stirring is reduced to 250 rpm during cooling.
- the reaction medium is transferred to a double-wall thermostatic beaker equipped with an anchor-like stirrer.
- the stirring speed is set at a speed of 140 RPM.
- the temperature of the jacket is set at 50 ° C and then descended in a temperature ramp of 10 ° C / h.
- the temperature is maintained at 12 ° C for one hour with stirring.
- the medium is filtered under vacuum on filter tulip.
- the crystals thus obtained are dried in a desiccator under vacuum at room temperature.
- composition of the crystals after drying is presented in Table 2 (GPC analyzes and results expressed in% of surface distribution).
- the purity of the crystals thus obtained reaches about 98% by simple crystallization of the crude reaction product.
- the operating conditions are identical to those described in Example 1 without the crystallization step, except that the nature of the oxygen source (oxidant) has varied as well as the reaction atmosphere pressure.
- EXAMPLE 3 Influence of the Oxygen Transfer Agent 10 g (79 mmol) of 5-HMF having a purity of 98%, 0.213 g (1 g) are introduced into a reactor identical to that used in Example 1. mmol) of 4AA tempo, 100 g (1.67 mol) of acetic acid. An oxygen transfer agent is also introduced or not into the reactor in the amounts detailed in Table 4.
- the operating conditions are identical to those described in Example 1 without the crystallization step.
- the operating conditions are identical to those described in Example 1 without the crystallization step.
- the reactants are introduced by varying various parameters of the reaction such as the dry matter (DM) shown in Table 6, the solvent shown in Table 7, the presence of water in the reaction medium shown in Table 8 and the content of 4AATempo shown in Table 9.
- Dry matter has little effect on FDF yields, with a minimum yield of about 93% to 40% DM.
- the reaction solvent influences the conversion of 5-HMF to DFF.
- the yield of FTD decreases by 9.1 points from the acetic medium to the propionic medium.
- no conversion of 5-HMF is observed in a formic acid medium (reducing agent).
- the acetic acid medium is therefore preferred for the conversion of 5-HMF to DFF. 0
- Table 8 Influence of the water content in the reaction medium
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Furan Compounds (AREA)
Abstract
The invention relates to a method for oxidizing 5-hydroxymethyl furaldehyde, including at least one step of oxidation in the presence of an organic acid, a nitroxyl radical, an oxygen source, and an oxygen transfer agent.
Description
Procédé amélioré d' oxydation sélective Improved selective oxidation process
du 5-hydrométhyl furaldéhyde 5-hydromethyl furaldehyde
DOMAINE DE L ' INVENTION FIELD OF THE INVENTION
La présente invention est relative à un nouveau procédé d'oxydation du 5-hydroxyméthyl furaldéhyde (5-HMF). Le produit d'oxydation du 5-HMF sélectivement formé à l'issue de ce procédé est le furane-2 , 5-dialdéhyde ou 2 , 5-diformylfurane (DFF) . The present invention relates to a novel process for the oxidation of 5-hydroxymethyl furaldehyde (5-HMF). The oxidation product of 5-HMF selectively formed at the end of this process is furan-2,5-dialdehyde or 2,5-diformylfuran (FDF).
ART ANTERIEUR PRIOR ART
Le 5-HMF est un composé organique dérivé notamment des oses en C6 tels que le fructose et le glucose. Il est constitué d'un hétérocycle furanique et possède deux groupes fonctionnels, l'un aldéhydique et l'autre alcoolique. 5-HMF is an organic compound derived in particular from C6 oses such as fructose and glucose. It consists of a furanic heterocycle and has two functional groups, one aldehyde and the other alcoholic.
L'oxydation du 5-HMF conduit à la formation de composés tels que : The oxidation of 5-HMF leads to the formation of compounds such as:
- le furane-2 , 5-dialdéhyde ou 2 , 5-diformylfurane (DFF), qui résulte de la seule oxydation de la fonction alcool primaire du 5-HMF en une fonction aldéhyde, furan-2, 5-dialdehyde or 2,5-diformylfuran (FDF), which results from the oxidation of the primary alcohol function of 5-HMF alone to an aldehyde function,
- l'acide 5-furaldéhyde-2-carboxylique ou acide 5- formylfuran-2-carboxylique (FFCA) , qui résulte de l'oxydation des fonctions alcool et aldéhyde du 5-HMF en une fonction aldéhyde et une fonction acide carboxylique, 5-furaldehyde-2-carboxylic acid or 5-formylfuran-2-carboxylic acid (FFCA), which results from the oxidation of the alcohol and aldehyde functions of 5-HMF to an aldehyde function and a carboxylic acid function,
- l'acide 2,5-furane dicarboxylique (FDCA) , qui résulte de l'oxydation des fonctions aldéhyde et alcool primaire du 5-HMF en fonctions acide carboxylique. 2,5-furan dicarboxylic acid (FDCA), which results from the oxidation of the aldehyde and primary alcohol functions of 5-HMF to carboxylic acid functions.
Le 5-HMF présente l'inconvénient majeur de n'être pas stable notamment à hautes températures. Il en résulte généralement une faible pureté des produits d'oxydation, même sélective, du 5-HMF.
Malgré cet inconvénient, les procédés d'oxydation du 5- HMF ont été très largement étudiés. Par exemple, le brevet FR 2 669 634 est relatif à un procédé d'oxydation catalytique du 5-HMF conduisant à la synthèse de FDCA. Ce procédé consiste à oxyder le 5-HMF en milieu aqueux alcalin, sous courant d'oxygène, en présence d'un catalyseur à base de platine activé au plomb. Le procédé d'oxydation conduit sélectivement au FDCA sous forme d'un sel. Un tel procédé en milieu alcalin présente donc, en tout premier lieu, l'inconvénient majeur de générer de grosses quantités de sels et est donc difficilement industrialisable . 5-HMF has the major disadvantage of not being stable especially at high temperatures. This generally results in low purity of the oxidation products, even if selective, of 5-HMF. Despite this disadvantage, the oxidation processes of 5-HMF have been widely studied. For example, patent FR 2,669,634 relates to a catalytic oxidation process of 5-HMF leading to the synthesis of FDCA. This process consists in oxidizing 5-HMF in alkaline aqueous medium under an oxygen stream in the presence of a lead-activated platinum-based catalyst. The oxidation process selectively leads to FDCA in the form of a salt. Such a process in alkaline medium therefore has, first and foremost, the major disadvantage of generating large quantities of salts and is therefore difficult to industrialize.
La demanderesse s'est donc intéressée spécifiquement aux procédés d'oxydation du 5-HMF en milieu acide. Par ailleurs, la société demanderesse, cherchant à obtenir des produits de pureté élevée sans adjonction d'étapes subséquentes, généralement coûteuses, de séparation ou de purification complexe, s'est intéressée aux procédés d'oxydation sélective du 5-HMF. The Applicant was therefore specifically interested in the oxidation processes of 5-HMF in an acid medium. Moreover, the applicant company, seeking to obtain high purity products without the addition of subsequent steps, generally expensive, separation or complex purification, was interested in selective oxidation processes of 5-HMF.
Parmi ces procédés en milieu acide, le principe d'une catalyse hétérogène semble à première vue la voie la plus prometteuse. En effet, les réactions en catalyse homogène nécessitent généralement une séparation des produits de réaction dissous. Among these acidic processes, the principle of heterogeneous catalysis seems at first sight the most promising route. In fact, reactions in homogeneous catalysis generally require separation of the dissolved reaction products.
La catalyse hétérogène est usuellement caractérisée par l'utilisation de métaux précieux fixés sur divers supports. Ce type de catalyse est particulièrement sensible aux impuretés contenues dans le milieu d'oxydation. Il est donc indispensable, pour que le procédé soit industriellement acceptable, de travailler avec des réactifs de haute pureté afin que le support du catalyseur, voire même le catalyseur lui-même, ne soit pas désactivé par empoisonnement des sites actifs . Heterogeneous catalysis is usually characterized by the use of precious metals fixed on various supports. This type of catalysis is particularly sensitive to the impurities contained in the oxidation medium. It is therefore essential, for the process to be industrially acceptable, to work with high purity reagents so that the catalyst support, or even the catalyst itself, is not deactivated by poisoning the active sites.
La demanderesse s'est donc finalement spécifiquement intéressée aux procédés d'oxydation du 5-HMF en milieu acide
en catalyse homogène. De tels procédés nécessitent néanmoins des ratios catalyseur/réactif relativement faibles pour être viables à l'échelle industrielle. The Applicant has therefore finally specifically interested in the processes of oxidation of 5-HMF in acid medium in homogeneous catalysis. Such processes nevertheless require relatively low catalyst / reagent ratios to be commercially viable.
Cottier et al. (J. Heterocyclic Chem. (1995), vol. 32, n° 3, pp 927-930) décrit différents types de procédés de préparation de DFF . Les procédés présentant les meilleurs rendements sont ceux réalisés en milieu basique, avec la présence de co-oxydants autres que l'oxygène et un catalyseur tel qu'un ( 2 , 2 , 6 , 6-tetramethylpiperidin-l-yl ) oxyl , nommé ci- après Tempo. Les catalyses en milieu acide sont également décrites mais, dans de telles conditions, la quantité de catalyseur nécessaire est extrêmement élevée (ratio molaire Tempo/5-HMF de 2/10), et ces catalyses nécessitent en outre la présence d'un co-oxydant de type métallique. Cottier et al. (J. Heterocyclic Chem (1995), vol 32, No. 3, pp 927-930) discloses various types of methods of preparing FDF. The processes with the best yields are those carried out in a basic medium, with the presence of co-oxidants other than oxygen and a catalyst such as (2, 2, 6, 6-tetramethylpiperidin-1-yl) oxyl, named hereinafter Tempo. Acidic acid catalysts are also described but, under such conditions, the amount of catalyst required is extremely high (Tempo / 5-HMF molar ratio of 2/10), and these catalysts also require the presence of a co-polymer. metal type oxidant.
Ainsi, bien qu'il existe de très nombreuses voies de préparation d'un ou plusieurs produits d'oxydation du 5-HMF, celles-ci présentent malheureusement toutes au moins un des inconvénients suivants : un faible taux de conversion du 5- HMF, une faible sélectivité en DFF à l'issue du procédé d'oxydation, un faible rendement, un coût économique élevé, une forte production de sel (s), la nécessité d'un réacteur conçu pour les mélanges triphasiques , etc. Il existe donc un réel besoin de développer un procédé amélioré d'oxydation du 5-HMF ne présentant aucun des désavantages ci-dessus. Thus, although there are many ways of preparing one or more 5-HMF oxidation products, these unfortunately all have at least one of the following disadvantages: a low conversion rate of 5-HMF, a low FFF selectivity at the end of the oxidation process, a low yield, a high economic cost, a high salt production (s), the need for a reactor designed for triphasic mixtures, etc. There is therefore a real need to develop an improved 5-HMF oxidation process having none of the above disadvantages.
RESUME DE L'INVENTION SUMMARY OF THE INVENTION
La présente invention a pour objet un procédé d'oxydation du 5-HMF caractérisé en ce qu'il comprend une étape d'oxydation en présence d'au moins un acide organique, un radical nitroxyl, une source en oxygène et un agent de transfert d'oxygène.
DESCRIPTION DETAILLEE The subject of the present invention is a process for the oxidation of 5-HMF, characterized in that it comprises an oxidation step in the presence of at least one organic acid, a nitroxyl radical, an oxygen source and a transfer agent. oxygen. DETAILED DESCRIPTION
Le procédé d'oxydation du 5-HMF selon l'invention présente en particulier l'avantage de permettre la préparation de DFF à partir de 5-HMF à un taux de conversion élevé ainsi qu'à un rendement et une sélectivité particulièrement hauts. In particular, the oxidation process of 5-HMF according to the invention has the advantage of allowing the preparation of DFF from 5-HMF at a high conversion rate and at a particularly high yield and selectivity.
Dans toute la présente demande, on utilise les termes de sélectivité (S), de conversion (C) et de rendement (R) en référence aux définitions suivantes : C ( % molaire ) = ((quantité de 5-HMF transformée) x 100) Throughout the present application, the terms selectivity (S), conversion (C) and yield (R) are used with reference to the following definitions: C (mol%) = ((amount of 5-HMF transformed) × 100 )
/ quantité de 5-HMF initiale / amount of initial 5-HMF
S (% molaire) = ((quantité de DFF formée) x 100) / quantité de 5-HMF transformée S (mol%) = ((amount of FDF formed) x 100) / amount of 5-HMF transformed
R ( % molaire) = S x C /100 = ( (quantité de DFF formée) x 100) / quantité de HMF initiale R (mol%) = S x C / 100 = ((amount of DFF formed) x 100) / amount of initial HMF
Le procédé d'oxydation de la présente invention peut-être réalisé dans tous types de réacteurs batch ou lit fixe, sous pression ou non. Le type de réacteur batch peut être un autoclave muni d'un agitateur à vitesse variable et d'un système de double pâle en forme d'hélice. Préférent iellement , le réacteur est en outre muni d'un tube d'admission de gaz, connecté à un système sous pression munie d'un détendeur, et d'un tube d'évacuation de gaz. Le réacteur peut en outre comprendre un système de refroidissement et également un système de mesure et de régulation de la température. The oxidation process of the present invention can be carried out in all types of batch reactors or fixed bed, under pressure or not. The type of batch reactor may be an autoclave equipped with a variable speed stirrer and a double pale helical system. Preferably, the reactor is further provided with a gas inlet tube, connected to a pressurized system provided with an expander, and a gas evacuation tube. The reactor may further comprise a cooling system and also a system for measuring and regulating the temperature.
Le 5-HMF utilisé dans le procédé objet de l'invention peut être obtenu selon toute technique connue de l'homme du métier, en particulier obtenu selon l'enseignement des documents FR 2 551 754, FR 2 464 260 et WO 2011/124639. Il peut également s'agir du brut réactionnel tel que décrit dans les documents précédemment cités, ledit brut réactionnel étant simplement séparé du solvant réactionnel. En effet,
selon le procédé de la présente invention, il n'est pas nécessaire, pour obtenir un DFF de haute pureté à l'issue du procédé, de partir d'un 5-HMF purifié. On entend ici par « DFF de haute pureté » un DFF de pureté supérieure à 90%, préfèrentiellement supérieure à 95% et plus préfèrentiellement supérieure à 98%. The 5-HMF used in the process which is the subject of the invention can be obtained according to any technique known to those skilled in the art, in particular obtained according to the teaching of documents FR 2 551 754, FR 2 464 260 and WO 2011/124639. . It may also be the reaction crude as described in the documents cited above, said reaction crude being simply separated from the reaction solvent. Indeed, according to the process of the present invention, it is not necessary, to obtain a high purity DFF at the end of the process, from a purified 5-HMF. The term "high purity FDF" is understood herein to mean a DFF of purity greater than 90%, preferably greater than 95% and more preferably greater than 98%.
L'acide organique utilisé dans le procédé objet de l'invention peut être tout acide organique à l'exclusion de ceux présentant une fonction réductrice, notamment à l'exclusion de l'acide formique. En effet, cet acide organique est utilisé comme solvant et doit donc être stable dans les conditions du procédé. L'acide organique utilisé dans le procédé objet de l'invention peut être en particulier un acide organique aliphatique liquide à température ambiante autre que l'acide formique. De façon préférée, il est choisi parmi l'acide acétique et l'acide propionique. The organic acid used in the process which is the subject of the invention may be any organic acid, with the exception of those having a reducing function, in particular excluding formic acid. Indeed, this organic acid is used as a solvent and must therefore be stable under the conditions of the process. The organic acid used in the process which is the subject of the invention may in particular be an organic aliphatic acid which is liquid at room temperature other than formic acid. Preferably, it is chosen from acetic acid and propionic acid.
Selon le procédé objet de l'invention, l'acide organique est avantageusement présent à raison de 50% à 99% en poids du mélange réactionnel, préfèrentiellement 70% à 90% en poids du mélange réactionnel. According to the process which is the subject of the invention, the organic acid is advantageously present in a proportion of 50% to 99% by weight of the reaction mixture, preferably 70% to 90% by weight of the reaction mixture.
Selon le procédé objet de l'invention, le radical nitroxyl est préfèrentiellement choisi parmi les (2,2,6,6- tetramethylpiperidin-l-yl ) oxyl , nommés ci-après Tempo, substitués ou non. Plus préfèrentiellement , le radical nitroxyl est un ( 2 , 2 , 6 , 6-tetramethylpiperidin-l-yl ) oxyl substitué en position 4, plus préfèrentiellement encore, il s'agit du 4-acétoamino- ( 2 , 2 , 6 , 6-tétraméthylpiperidin-l- yl)oxyl ou 4AA Tempo. Le Tempo utilisé dans le procédé de la présente invention peut être immobilisé ou non. Dans le cas d'un Tempo immobilisé, celui-ci est avantageusement fixé en position 4 sur résine polymérique. Dans le cas d'un Tempo immobilisé, on peut avantageusement travailler en réacteur continu à lit fixe.
Selon le procédé objet de l'invention, le radical nitroxyl est avantageusement présent en quantité catalytique. En particulier, le radical nitroxyl est présent à raison de 0,01 à 15% en poids par rapport au poids de 5-HMF, préfèrentiellement 1 à 10% en poids par rapport au poids de 5-HMF, plus préfèrentiellement encore 2 à 5% en poids par rapport au poids de 5-HMF. According to the process which is the subject of the invention, the nitroxyl radical is preferably chosen from (2,2,6,6-tetramethylpiperidin-1-yl) oxyl, hereinafter referred to as Tempo, which may or may not be substituted. More preferably, the nitroxyl radical is a (2, 2, 6, 6-tetramethylpiperidin-1-yl) oxyl substituted at the 4-position, more preferably still it is 4-acetoamino- (2, 2, 6, 6). tetramethylpiperidin-1-yl) oxyl or 4AA Tempo. The Tempo used in the process of the present invention may be immobilized or not. In the case of an immobilized Tempo, it is advantageously fixed in position 4 on polymeric resin. In the case of an immobilized Tempo, it is advantageous to work in a fixed-bed continuous reactor. According to the process which is the subject of the invention, the nitroxyl radical is advantageously present in a catalytic amount. In particular, the nitroxyl radical is present in a proportion of 0.01 to 15% by weight relative to the weight of 5-HMF, preferably 1 to 10% by weight relative to the weight of 5-HMF, more preferably still 2 to 5 % by weight relative to the weight of 5-HMF.
Selon le procédé de la présente invention, la source en oxygène est préfèrentiellement choisie parmi l'air et l'oxygène moléculaire sous pression et/ou sous flux. According to the method of the present invention, the oxygen source is preferably selected from air and molecular oxygen under pressure and / or under flow.
L'agent de transfert d'oxygène est quant à lui avantageusement choisi parmi les dérivés d'oxyde d'azote. Les dérivés d'oxyde d'azote sont sélectionnés préfèrent iellement parmi les sources en nitrate, l'oxyde nitrique (NO) et le dioxyde d'azote (NO2) . A titre d'exemples, les sources en nitrate incluent l'acide nitrique, le nitrate d'ammonium, les nitrates d'alkyl ammonium, les nitrates alcalins ou alcalino- terreux. Selon un mode particulier de l'invention, un ou plusieurs dérivés d'oxyde d'azote peuvent être utilisés dans le procédé d'oxydation. Selon un mode particulièrement préféré de l'invention, le dérivé d'oxyde d'azote est l'acide nitrique . The oxygen transfer agent is advantageously chosen from nitrogen oxide derivatives. Nitrogen oxide derivatives are preferably selected from the sources of nitrate, nitric oxide (NO) and nitrogen dioxide (NO 2 ). As examples, nitrate sources include nitric acid, ammonium nitrate, alkyl ammonium nitrates, alkaline or alkaline earth nitrates. According to one particular embodiment of the invention, one or more nitrogen oxide derivatives can be used in the oxidation process. According to a particularly preferred embodiment of the invention, the nitrogen oxide derivative is nitric acid.
Selon le procédé objet de l'invention, la source en nitrate est avantageusement présente à raison d'un ratio source en nitrate/radical nitroxyl de 0,5/1 à 40/1 dans le mélange réactionnel, préfèrentiellement d'un ratio source en nitrate/radical nitroxyl de 3/1 à 10/1 dans le mélange réactionnel . According to the method which is the subject of the invention, the nitrate source is advantageously present at a ratio of nitrate / nitroxyl source ratio of from 0.5: 1 to 40: 1 in the reaction mixture, preferably from a source ratio of nitrate / nitroxyl radical of 3/1 to 10/1 in the reaction mixture.
Selon le procédé objet de l'invention, il n'y a aucun besoin particulier d'adjoindre au milieu réactionnel un co- catalyseur de type métallique tel que notamment le chlorure de ruthénium, le chlorure ferrique et le chlorure de cuivre. La demanderesse a notamment mis en évidence le fait que la
substitution de l'agent de transfert d'oxygène par un co- catalyseur de type métallique ne permet pas de convertir le 5-HMF en DFF . De plus, selon le procédé objet de l'invention, l'ajout de co-catalyseur de type métallique en présence ou non d'acide nitrique n'apporte pas d'amélioration notable au rendement en DFF . According to the process which is the subject of the invention, there is no particular need to add to the reaction medium a co-catalyst of metal type such as in particular ruthenium chloride, ferric chloride and copper chloride. The plaintiff has in particular highlighted the fact that the substitution of the oxygen transfer agent with a metal co-catalyst does not convert 5-HMF to DFF. In addition, according to the method which is the subject of the invention, the addition of metal-type co-catalyst in the presence or absence of nitric acid does not bring any noticeable improvement in the yield of DFF.
Selon un mode de réalisation tout à fait particulier, les ratios entre les réactifs du procédé d'oxydation selon l'invention s'établissent de façon à avoir 2,1% de 4AA Tempo en poids par rapport au poids de 5-HMF, un ratio molaire 5- HMF/acide acétique d'environ 0,05 et un ratio molaire HN03/4AA Tempo de 4. According to a very particular embodiment, the ratios between the reagents of the oxidation process according to the invention are established so as to have 2.1% of 4AA Tempo by weight relative to the weight of 5-HMF, a 5-HMF / acetic acid molar ratio of about 0.05 and a molar ratio of HNO 3 / 4AA Tempo of 4.
Le procédé selon l'invention peut être réalisé en absence ou en présence d'eau. Si le procédé est réalisé en présence d'eau, celle-ci est alors présente à raison d'au plus 200% en poids par rapport au 5-HMF, préfèrentiellement au plus 50% en poids par rapport au 5-HMF. The process according to the invention can be carried out in the absence or in the presence of water. If the process is carried out in the presence of water, it is then present at a rate of at most 200% by weight relative to 5-HMF, preferably at most 50% by weight relative to 5-HMF.
Selon le procédé de l'invention, les réactifs sont placés dans le réacteur, ce dernier étant avantageusement purgé au moins une fois sous pression. La purge peut par exemple être réalisée à 0,3 MPa en oxygène. Le réacteur est ensuite mis en chauffe. La chauffe peut avantageusement être réalisée sous pression d'oxygène, préfèrentiellement sous 0,01 à 5 MPa d ' oxygène . According to the process of the invention, the reactants are placed in the reactor, the latter being advantageously purged at least once under pressure. The purge can for example be carried out at 0.3 MPa oxygen. The reactor is then heated. The heating can advantageously be carried out under oxygen pressure, preferably under 0.01 to 5 MPa of oxygen.
Au cours du procédé d'oxydation, le milieu réactionnel est maintenu sous agitation. La vitesse d'agitation est préfèrentiellement réglée entre 800 et 2200 rpm, plus préfèrentiellement entre 1500 et 1700 rpm. During the oxidation process, the reaction medium is stirred. The stirring speed is preferably set between 800 and 2200 rpm, more preferably between 1500 and 1700 rpm.
Selon un mode avantageux de réalisation, lorsque la température à l'intérieur du réacteur atteint environ 70°C, la pression d'oxygène est ajustée à une pression d'atmosphère réactionnelle comprise entre 0,01 MPa et 5 MPa, préfèrentiellement comprise entre 0,1 MPa et 2 MPa, plus préfèrentiellement entre 0,2 et 0,5 MPa.
La consommation d'oxygène au cours de la première étape d'oxydation du procédé selon l'invention débute généralement à 80 °C. Avantageusement, la température au cours de la première étape d'oxydation est régulée entre 50°C et 150°C, préfèrentiellement entre 70°C à 110°C, plus préfèrentiellement encore entre 80°C et 90°C. According to an advantageous embodiment, when the temperature inside the reactor reaches approximately 70 ° C., the oxygen pressure is adjusted to a reaction atmosphere pressure of between 0.01 MPa and 5 MPa, preferably between 0.degree. , 1 MPa and 2 MPa, more preferably between 0.2 and 0.5 MPa. Oxygen consumption during the first oxidation step of the process according to the invention generally starts at 80 ° C. Advantageously, the temperature during the first oxidation step is regulated between 50 ° C. and 150 ° C., preferably between 70 ° C. and 110 ° C., more preferably still between 80 ° C. and 90 ° C.
Selon un mode de réalisation préféré, la première étape d'oxydation du procédé selon l'invention dure de 1 minute à 5h, préfèrentiellement de 30 minutes à 2h. According to a preferred embodiment, the first oxidation step of the process according to the invention lasts from 1 minute to 5 hours, preferably from 30 minutes to 2 hours.
A la fin de la première étape d'oxydation du procédé selon l'invention, le réacteur est mis en refroidissement, par exemple par simple coupure de la chauffe avec retrait de la calotte chauffante, sans utilisation de la boucle de refroidissement . At the end of the first oxidation step of the process according to the invention, the reactor is cooled down, for example by simply cutting off the heating with removal of the heating cap, without using the cooling loop.
L'agitation au sein du réacteur est diminuée, progressivement ou non, durant le refroidissement. Stirring in the reactor is decreased, gradually or not, during cooling.
Avantageusement, lorsque le réacteur atteint 40 à 80°C, préfèrentiellement 60°C, l'agitation est complètement arrêtée et la pression est ramenée à la pression atmosphérique. Advantageously, when the reactor reaches 40 to 80.degree. C., preferably 60.degree. C., the stirring is completely stopped and the pressure is brought back to atmospheric pressure.
De manière particulièrement avantageuse et jusqu'à une matière sèche de 30% en poids de 5-HMF de départ, à la fin de la première étape d'oxydation et après refroidissement, tous les composants sont alors en solution, il n'y a ni cristaux ni précipités. Particularly advantageously and up to a solids content of 30% by weight of starting 5-HMF, at the end of the first oxidation step and after cooling, all the components are then in solution, there is no neither crystals nor precipitates.
Le procédé d'oxydation du 5-HMF selon l'invention est particulièrement avantageux puisqu'il permet la préparation sélective de DFF à un rendement élevé. En particulier, la sélectivité d'oxydation du 5-HMF en DFF au cours de la première étape d'oxydation est préfèrentiellement de 80 à 100%, plus préfèrentiellement encore de 90 à 100%. The oxidation process of 5-HMF according to the invention is particularly advantageous since it allows the selective preparation of FDF at a high yield. In particular, the oxidation selectivity of 5-HMF to DFF during the first oxidation step is preferably from 80 to 100%, more preferably from 90 to 100%.
A l'issue de la première étape d'oxydation du 5-HMF, le brut réactionnel contenant le DFF peut contenir en outre un certain nombre de co-produits (cités sous ce terme dans les exemples). Il s'agit généralement ma oritairement de produits
de suroxydation du 5-HMF, en particulier, de FFCA et/ou de FDCA . At the end of the first oxidation step of 5-HMF, the crude reaction product containing the DFF may also contain a certain number of co-products (mentioned under this term in the examples). This is usually my products overoxidation of 5-HMF, in particular, FFCA and / or FDCA.
De manière préférée et en particulier lorsque l'acide acétique a été choisi comme solvant pour la première étape d'oxydation, le procédé selon l'invention comprend en outre, après la première étape d'oxydation, une étape de cristallisation. En effet, l'acide acétique est un bon solvant de cristallisation du DFF . In a preferred manner, and in particular when acetic acid has been chosen as the solvent for the first oxidation step, the process according to the invention further comprises, after the first oxidation step, a crystallization step. Indeed, acetic acid is a good solvent for crystallizing DFF.
L'étape de cristallisation peut être réalisée directement dans le réacteur ou dans un autre appareillage notamment lors d'un procédé continu. Avantageusement, cet autre appareillage peut être un cristallisoir thermostaté double enveloppe muni d'un système d'agitation. The crystallization step may be carried out directly in the reactor or in another apparatus, in particular during a continuous process. Advantageously, this other apparatus may be a thermostatic crystallizer double jacket provided with a stirring system.
Durant l'étape de cristallisation, la vitesse d'agitation est avantageusement réglée à une vitesse faible, préfèrentiellement à une vitesse comprise entre 80 rpm et 250 rpm . During the crystallization step, the stirring speed is advantageously set at a low speed, preferably at a speed of between 80 rpm and 250 rpm.
Avantageusement, la température est abaissée progressivement durant l'étape de cristallisation, préfèrentiellement descendue suivant une rampe de température de 10°C/h. Advantageously, the temperature is lowered gradually during the crystallization step, preferably down in a temperature ramp of 10 ° C / h.
A la fin de l'étape de cristallisation, une très faible température, de l'ordre d'une dizaine de degrés, est maintenue. Avantageusement, la température est maintenue de 10 à 15°C pendant environ une heure sous agitation. Le milieu est ensuite avantageusement filtré. A titre d'exemple, il peut s'agir d'une filtration sous vide sur tulipe filtrante. Les cristaux ainsi obtenus lors de cette étape sont alors séchés lors d'une étape additionnelle de séchage, par exemple dans un dessiccateur sous vide à température ambiante. At the end of the crystallization step, a very low temperature, of the order of ten degrees, is maintained. Advantageously, the temperature is maintained at 10 to 15 ° C for about one hour with stirring. The medium is then advantageously filtered. For example, it may be a vacuum filtration filter tulip. The crystals thus obtained during this step are then dried during an additional drying step, for example in a vacuum desiccator at room temperature.
Le procédé d'oxydation du 5-HMF selon l'invention est particulièrement avantageux puisqu'il permet l'obtention de DFF de haute pureté à partir d'un 5-HMF de faible pureté. On entend par 5-HMF de faible pureté un 5-HMF issu d'un brut
réactionnel de procédés de l'art antérieur, ledit brut réactionnel étant simplement séparé du solvant réactionnel. The oxidation process of 5-HMF according to the invention is particularly advantageous since it makes it possible to obtain high purity DFF from a low purity 5-HMF. Low purity 5-HMF means a 5-HMF from a crude process reaction of the prior art, said reaction crude being simply separated from the reaction solvent.
Selon un mode particulièrement avantageux de l'invention, les cristaux séchés présentent une pureté en DFF supérieure à 90% en poids, préfèrentiellement supérieure à 95% en poids, plus préfèrentiellement encore supérieure à 98% en poids. According to a particularly advantageous embodiment of the invention, the dried crystals have a DFF purity greater than 90% by weight, preferably greater than 95% by weight, more preferably still greater than 98% by weight.
L'invention sera encore mieux comprise à l'aide des exemples qui suivent, lesquels ne se veulent pas limitatifs et font seulement état de certains modes de réalisation et de certaines propriétés avantageuses du DFF conformes à 1 ' invention . The invention will be better understood from the following examples, which are not intended to be limiting and only mention certain embodiments and advantageous properties of the DFF according to the invention.
EXEMPLES Exemple 1 : Préparation de 5-HMF EXAMPLES Example 1: Preparation of 5-HMF
Dans un autoclave en inox d'une capacité interne de 600 ml, commercialisé par la société PARR (modèle n° 4346), muni d'un agitateur à vitesse variable et d'un système de double pâle en forme d'hélice, d'un tube d'admission de gaz connecté à une bouteille sous pression munie d'un détendeur, d'un tube d'évacuation de gaz, d'un serpentin de refroidissement et d'un système de mesure et de régulation de la température, on place 10 g (79 mmol) de 5- (hydroxyméthyl ) furfural (appelé ici 5-HMF, pureté de 98%), 0,213 g (1 mmol) de 4-acétoamino- ( 2 , 2 , 6 , 6-tétraméthylpiperidin-l-yl ) oxyl (appelé ici 4AA tempo), 100 g (1,67 mol) d'acide acétique, 4,35 g d'acide nitrique à 0,91 mol/1 (4 mmol) . In a stainless steel autoclave with an internal capacity of 600 ml, marketed by the company PARR (model No. 4346), provided with a variable speed stirrer and a system of double pale in the form of a helix, a gas inlet tube connected to a pressure bottle provided with a pressure reducer, a gas evacuation tube, a cooling coil and a system for measuring and regulating the temperature, place 10 g (79 mmol) of 5- (hydroxymethyl) furfural (herein referred to as 5-HMF, 98% purity), 0.213 g (1 mmol) of 4-acetoamino- (2,2,6,6-tetramethylpiperidin-1) -yl) oxyl (hereinafter 4AA tempo), 100 g (1.67 mol) of acetic acid, 4.35 g of nitric acid at 0.91 mol / l (4 mmol).
Les ratios s'établissent de façon à avoir 2,1% en poids de 4AA Tempo, 5% molaire d'acide nitrique par rapport au 5- HMF. Le ratio HN03/4AA Tempo est donc de 4. The ratios are established so as to have 2.1% by weight of 4AA Tempo, 5% molar of nitric acid with respect to 5-HMF. The ratio HN0 3 / 4AA Tempo is therefore 4.
Tous les réactifs placés dans l'autoclave, celui-ci est purgé une fois à 0,3 MPa en oxygène puis mis en chauffe sous 0,1 MPa d'oxygène. La vitesse d'agitation est alors réglée à
1600 tours par minute. Lorsque le réacteur atteint 70°C, la pression d'oxygène est ajustée à 0,3 MPa. La consommation d'oxygène débute à 80°C. La température est régulée à 85°C pendant lhO 0. All the reagents placed in the autoclave, it is purged once at 0.3 MPa oxygen and then heated under 0.1 MPa of oxygen. The stirring speed is then set to 1600 rpm. When the reactor reaches 70 ° C., the oxygen pressure is adjusted to 0.3 MPa. The oxygen consumption starts at 80 ° C. The temperature is regulated at 85 ° C. for 1 h 0.
Après une heure de temps de contact, l'autoclave est mis en refroidissement par simple coupure de la chauffe avec retrait de la calotte chauffante sans circulation d'eau dans la boucle de refroidissement (évite la cristallisation du DFF sur le serpentin) . L'agitation est ramenée à 250 tours par minute durant le refroidissement. After one hour of contact time, the autoclave is cooled down by simply cutting off the heating with removal of the heating cap without circulation of water in the cooling loop (prevents crystallization of the DFF on the coil). Stirring is reduced to 250 rpm during cooling.
Lorsque le réacteur atteint 60°C, l'agitation est arrêtée et la pression est ramenée à la pression atmosphérique. L'autoclave est ouvert à 60°C, tous les composants sont en solution, il n'y a ni cristaux ni précipités. When the reactor reaches 60 ° C, stirring is stopped and the pressure is reduced to atmospheric pressure. The autoclave is open at 60 ° C., all the components are in solution, there are no crystals or precipitates.
Un échantillon du brut réactionnel est prélevé et analysé en chromatographie en phase gazeuse (CPG) , les résultats sont exprimés en % de répartition de surface. A sample of the reaction crude is taken and analyzed by gas chromatography (GPC), the results are expressed in% of surface distribution.
La composition du brut réactionnel est présentée au tableau 1. The composition of the crude reaction product is shown in Table 1.
Tableau 1 Table 1
Pour l'étape de cristallisation, le milieu réactionnel est transféré dans un bêcher thermostaté double enveloppe muni d'une agitation en forme d'ancre. Durant la cristallisation, la vitesse d'agitation est réglée à une vitesse de 140 RPM. For the crystallization step, the reaction medium is transferred to a double-wall thermostatic beaker equipped with an anchor-like stirrer. During crystallization, the stirring speed is set at a speed of 140 RPM.
Pour débuter la cristallisation, la température de la double enveloppe est réglée à 50°C puis est descendue suivant une rampe de température de 10°C/h. En fin de
cristallisation, la température est maintenue à 12°C pendant une heure sous agitation. To start the crystallization, the temperature of the jacket is set at 50 ° C and then descended in a temperature ramp of 10 ° C / h. In end of crystallization, the temperature is maintained at 12 ° C for one hour with stirring.
Après l'étape de cristallisation, le milieu est filtré sous vide sur tulipe filtrante. After the crystallization step, the medium is filtered under vacuum on filter tulip.
Les cristaux ainsi obtenus sont séchés dans un dessiccateur sous vide à température ambiante. The crystals thus obtained are dried in a desiccator under vacuum at room temperature.
La composition des cristaux après séchage est présentée au tableau 2 (analyses en CPG et résultats exprimés en % de répartition de surface) . The composition of the crystals after drying is presented in Table 2 (GPC analyzes and results expressed in% of surface distribution).
Tableau 2 Table 2
La pureté des cristaux ainsi obtenus atteint 98% environ par simple cristallisation du brut réactionnel. The purity of the crystals thus obtained reaches about 98% by simple crystallization of the crude reaction product.
Exemple 2 : Impact de la source en oxygène et de la pression d'atmosphère réactionnelle On introduit dans un réacteur identique à celui utilisé dans l'exemple 1, 10 g (79 mmol) de 5-HMF ayant une pureté de 98%, 0,213 g (1 mmol) de 4AA tempo, 100 g (1,67 mol) d'acide acétique, 4,35 g d'acide nitrique à 0,91 mol/1 (4 mmol) . EXAMPLE 2 Impact of the Oxygen Source and of the Reaction Atmosphere Pressure 10 g (79 mmol) of 5-HMF having a purity of 98%, 0.213 are introduced into a reactor identical to that used in Example 1. g (1 mmol) of 4AA tempo, 100 g (1.67 mol) of acetic acid, 4.35 g of nitric acid at 0.91 mol / l (4 mmol).
Les conditions opératoires sont identiques à celles décrites dans l'exemple 1 sans l'étape de cristallisation, hormis le fait que la nature de la source en oxygène (oxydant) a varié ainsi que la pression d'atmosphère réactionnelle . The operating conditions are identical to those described in Example 1 without the crystallization step, except that the nature of the oxygen source (oxidant) has varied as well as the reaction atmosphere pressure.
Un échantillon du brut réactionnel est prélevé et analysé en CPG, les résultats sont exprimés en % de répartition de surface .
La composition du brut réactionnel est présentée au tableau 3. A sample of the reaction crude is taken and analyzed by GC, the results are expressed in% of surface distribution. The composition of the crude reaction product is shown in Table 3.
Tableau 3 Table 3
Quelque soit l'oxydant engagé, on constate une bonne sélectivité d'oxydation du 5-HMF en DFF (minimum de 94,6%) . Toutefois, afin d'obtenir une conversion maximale (supérieure à 90%), il est préférable de travailler avec de l'oxygène pur ou de l'air à haute pression. Whatever the oxidant involved, a good oxidation selectivity of 5-HMF in DFF (minimum of 94.6%) is observed. However, in order to obtain a maximum conversion (greater than 90%), it is preferable to work with pure oxygen or air at high pressure.
Exemple 3 : Influence de l'agent de transfert d'oxygène On introduit, dans un réacteur identique à celui utilisé dans l'exemple 1, 10 g (79 mmol) de 5-HMF ayant une pureté de 98%, 0,213 g (1 mmol) de 4AA tempo, 100 g (1,67 mol) d'acide acétique. Un agent de transfert d'oxygène est également introduit ou non dans le réacteur dans les quantités détaillées dans le tableau 4. EXAMPLE 3 Influence of the Oxygen Transfer Agent 10 g (79 mmol) of 5-HMF having a purity of 98%, 0.213 g (1 g) are introduced into a reactor identical to that used in Example 1. mmol) of 4AA tempo, 100 g (1.67 mol) of acetic acid. An oxygen transfer agent is also introduced or not into the reactor in the amounts detailed in Table 4.
Les conditions opératoires sont identiques à celles décrites dans l'exemple 1 sans l'étape de cristallisation. The operating conditions are identical to those described in Example 1 without the crystallization step.
Un échantillon du brut réactionnel est prélevé et analysé en chromatographie en CPG, les résultats sont exprimés en % de répartition de surface. A sample of the reaction crude is taken and analyzed by GC chromatography, the results are expressed in% of surface distribution.
La composition du brut réactionnel est présentée au tableau 4.
Tableau The composition of the crude reaction product is shown in Table 4. Board
En absence de l'agent de transfert d'oxygène, il n'y a pas de conversion du 5-HMF en DFF. De plus, la nature et la teneur de l'agent de transfert influent sur le rendement en DFF, avec un rendement maximal de 94% de DFF en présence d'un ratio molaire « agent / 4AA Tempo » de 4/1. Exemple 4 : Influence du radical nitroxyl In the absence of the oxygen transfer agent, there is no conversion of 5-HMF to DFF. In addition, the nature and content of the transfer agent affects the FDF yield, with a maximum yield of 94% FDF in the presence of a 4/1 agent / 4AA molar molar ratio. Example 4 Influence of the nitroxyl radical
Dans un réacteur identique à celui utilisé dans l'exemple 1, on introduit différents types de radicaux nitroxyl comme détaillé dans le tableau 5 ainsi que 10 g (79 mmol) de 5- HMF ayant une pureté de 98%, 100 g (1,67 mol) d'acide acétique, 4,35 g d'acide nitrique à 0,91 mol/1 (4 mmol) . In a reactor identical to that used in Example 1, various types of nitroxyl radicals are introduced as detailed in Table 5 as well as 10 g (79 mmol) of 5-HMF having a purity of 98%, 100 g (1, 67 mol) of acetic acid, 4.35 g of nitric acid at 0.91 mol / l (4 mmol).
Les conditions opératoires sont identiques à celles décrites dans l'exemple 1 sans l'étape de cristallisation. The operating conditions are identical to those described in Example 1 without the crystallization step.
Un échantillon du brut réactionnel est prélevé et analysé en chromatographie en CPG, les résultats sont exprimés en % de répartition de surface. A sample of the reaction crude is taken and analyzed by GC chromatography, the results are expressed in% of surface distribution.
La composition du brut réactionnel est présentée au tableau 5.
Tableau The composition of the crude reaction product is shown in Table 5. Board
(1) : Tempo immobilisé sur résine polymérique commercialisé par la société Arkema (1) Tempo immobilized on polymeric resin marketed by Arkema
Les différents radicaux nitroxyl sont efficaces pour la conversion du 5-HMF en DFF, avec un maximum de 94,6% de DFF pour le 4AA Tempo. Exemple 5 : Influence de la teneur en eau, de la matière sèche, du solvant et de la teneur en 4AA Tempo The different nitroxyl radicals are effective for the conversion of 5-HMF to DFF, with a maximum of 94.6% of DFF for the 4AA Tempo. Example 5 Influence of Water Content, Dry Matter, Solvent and 4AA Tempo Content
Dans un réacteur identique à celui utilisé dans l'exemple 1, on introduit les réactifs en faisant varier différents paramètres de la réaction tels que la matière sèche (MS) présentée au tableau 6, le solvant présenté au tableau 7, la présence d'eau dans le milieu réactionnel présentée au tableau 8 et la teneur en 4AATempo présentée au tableau 9. In a reactor identical to that used in Example 1, the reactants are introduced by varying various parameters of the reaction such as the dry matter (DM) shown in Table 6, the solvent shown in Table 7, the presence of water in the reaction medium shown in Table 8 and the content of 4AATempo shown in Table 9.
Les autres conditions opératoires sont identiques à celles décrites dans l'exemple 1 sans l'étape de cristallisation. The other operating conditions are identical to those described in Example 1 without the crystallization step.
Un échantillon du brut réactionnel est prélevé et analysé en CPG, les résultats sont exprimés en % de répartition de surface . A sample of the reaction crude is taken and analyzed by GC, the results are expressed in% of surface distribution.
La composition du brut réactionnel est présentée dans les tableaux 6, 7, 8, 9.
Tableau 6 : Evaluation de l' impact de la matière sècheThe composition of the crude reaction product is shown in Tables 6, 7, 8, 9. Table 6: Evaluation of the impact of dry matter
(MS) (MS)
5 La matière sèche influe peu sur les rendements en DFF, avec un rendement minimum d'environ 93% à 40% de MS . Dry matter has little effect on FDF yields, with a minimum yield of about 93% to 40% DM.
Tableau 7 : Evaluation de l'impact du solvant réactionnel Table 7: Evaluation of the impact of the reaction solvent
Le solvant réactionnel influe sur la conversion du 5-HMF en DFF. Le rendement en DFF diminue de 9,1 points en passant du milieu acétique au milieu propionique. De plus, aucune conversion du 5-HMF n'est observée en milieu acide formique (réducteur) . Le milieu acide acétique est donc privilégié pour la conversion du 5-HMF en DFF. 0
Tableau 8 : Influence de la teneur en eau dans le milieu réactionnel The reaction solvent influences the conversion of 5-HMF to DFF. The yield of FTD decreases by 9.1 points from the acetic medium to the propionic medium. In addition, no conversion of 5-HMF is observed in a formic acid medium (reducing agent). The acetic acid medium is therefore preferred for the conversion of 5-HMF to DFF. 0 Table 8: Influence of the water content in the reaction medium
La présence d'eau dans le milieu réactionnel ne crée pas de perte de richesse en DFF. The presence of water in the reaction medium does not create a loss of richness in FDF.
Tableau 9 : Influence de la teneur en radical nitroxyl Table 9: Influence of nitroxyl radical content
La teneur en 4AA Tempo influe sur la conversion du 5-HMF en DFF. L'augmentation du taux de catalyseur favorise la conversion du 5-HMF. Exemple 6 : Impact d'un co-catalyseur métallique The content of 4AA Tempo influences the conversion of 5-HMF to DFF. Increasing the catalyst level promotes the conversion of 5-HMF. Example 6 Impact of a Metallic Co-Catalyst
On introduit dans un réacteur identique à celui utilisé dans l'exemple 1, 10 g (79 mmol) de 5-HMF ayant une pureté de 98%, 0,213 g (1 mmol) de 4AA Tempo, 100 g (1,67 mol) d'acide acétique. Suivants les essais de l'acide nitrique à 0,91 mol/1 à raison de 4,35 g (4 mmol) et/ou 4 mmol de co- catalyseur métallique sont introduits ou non comme indiqué dans le tableau 10.
Les conditions opératoires sont identiques à celles décrites dans l'exemple 1 sans l'étape de cristallisation. 10 g (79 mmol) of 5-HMF having a purity of 98%, 0.213 g (1 mmol) of 4AA Tempo and 100 g (1.67 mol) are introduced into a reactor identical to that used in Example 1. of acetic acid. Next, the tests of nitric acid at 0.91 mol / l at a rate of 4.35 g (4 mmol) and / or 4 mmol of metal cocatalyst are introduced or not as indicated in Table 10. The operating conditions are identical to those described in Example 1 without the crystallization step.
Un échantillon du brut réactionnel est prélevé et analysé en CPG, les résultats sont exprimés en % de répartition de surface . A sample of the reaction crude is taken and analyzed by GC, the results are expressed in% of surface distribution.
La composition du brut réactionnel est présentée au tableau 10. The composition of the crude reaction product is shown in Table 10.
Tableau 10 Table 10
La substitution de l'agent de transfert d'oxygène par un co-catalyseur de type métallique ne permet pas de convertir le 5-HMF en DFF. Substitution of the oxygen transfer agent with a metal-type co-catalyst does not convert 5-HMF to DFF.
De plus, l'ajout de co-catalyseur de type métallique en présence ou non d'acide nitrique n'apporte pas d'amélioration notable au rendement en DFF.
In addition, the addition of metal-type co-catalyst in the presence or absence of nitric acid does not bring any noticeable improvement in the yield of FDF.
Claims
REVENDICATIONS
Procédé d'oxydation du 5-hydroxyméthyl furaldéhyde, caractérisé en ce qu'il comprend au moins une étape d'oxydation en présence d'au moins : Process for the oxidation of 5-hydroxymethyl furaldehyde, characterized in that it comprises at least one oxidation step in the presence of at least:
un acide organique, an organic acid,
un radical nitroxyl, a nitroxyl radical,
une source en oxygène et a source of oxygen and
un agent de transfert d'oxygène. an oxygen transfer agent.
Procédé selon la revendication 1 caractérisé en ce qu'il comprend, après l'étape d'oxydation, une étape de cristallisation. Process according to Claim 1, characterized in that it comprises, after the oxidation step, a crystallization step.
Procédé selon l'une ou l'autre des revendications 1 et 2, que caractérisé par le fait que l'acide organique est choisi parmi les acides organiques ne présentant pas une fonction réductrice. Process according to either of Claims 1 and 2, characterized in that the organic acid is chosen from organic acids which do not have a reducing function.
Procédé selon la revendication 3, caractérisé par le fait que l'acide organique est choisi parmi l'acide acétique ou l'acide propionique. Process according to Claim 3, characterized in that the organic acid is chosen from acetic acid or propionic acid.
Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'acide organique est présent à raison de 50% à 99% en poids, préfèrentiellement de 70% à 90% en poids, du mélange réactionnel.
Procédé selon l'une quelconque des revendications 1 à 5, caractérisé par le fait que la source en oxygène est choisie parmi l'air et l'oxygène moléculaire, sous pression et/ou sous flux. Process according to any one of claims 1 to 4, characterized in that the organic acid is present in a proportion of 50% to 99% by weight, preferably 70% to 90% by weight, of the reaction mixture. Process according to any one of Claims 1 to 5, characterized in that the oxygen source is chosen from air and molecular oxygen, under pressure and / or under flow.
Procédé selon l'une quelconque des revendications 1 à 6, caractérisé par le fait quele radical nitroxyl est choisi parmi les (2,2,6,6- tetramethylpiperidin-l-yl ) oxyl substitués ou non, préfèrentiellement un (2,2,6,6- tetramethylpiperidin-l-yl ) oxyl substitué en position 4. Process according to any one of claims 1 to 6, characterized in that the nitroxyl radical is chosen from (2,2,6,6-tetramethylpiperidin-1-yl) oxyl substituted or unsubstituted, preferably one (2,2, 6,6-tetramethylpiperidin-1-yl) oxyl substituted at the 4-position.
Procédé selon l'une quelconque des revendications 1 à 7, caractérisé par le fait que le radical nitroxyl est présent à raison de 0,01 à 15% en poids , préfèrentiellement de 1 à 10% en poids, par rapport au 5-HMF. Process according to any one of Claims 1 to 7, characterized in that the nitroxyl radical is present in a proportion of 0.01 to 15% by weight, preferably 1 to 10% by weight, relative to 5-HMF.
Procédé selon l'une quelconque des revendications 1 à 8, caractérisé par le fait que l'agent de transfert d'oxygène est choisi parmi les dérivés d'oxyde d'azote. Process according to any one of Claims 1 to 8, characterized in that the oxygen transfer agent is chosen from nitrogen oxide derivatives.
Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l' étape d'oxydation est réalisée à une pression d'atmosphère réactionnelle comprise entre 0,01 MPa et 5 MPa. Process according to any one of the preceding claims, characterized in that the oxidation step is carried out at a reaction atmosphere pressure of between 0.01 MPa and 5 MPa.
Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l' étape
d'oxydation est réalisée à une température comprise entre 50°C et 150°C, préfèrentiellement entre 70°C et 110°C. Method according to one of the preceding claims, characterized in that the step The oxidation is carried out at a temperature of between 50.degree. C. and 150.degree. C., preferably between 70.degree. C. and 110.degree.
Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que l' étape d'oxydation est réalisée en absence d'eau ou en présence à raison d'au plus 200% en poids, préfèrentiellement au plus 50% en poids d'eau, par rapport au 5-HMF.
Process according to any one of the preceding claims, characterized in that the oxidation step is carried out in the absence of water or in the presence of at most 200% by weight, preferably at most 50% by weight of water. , compared to 5-HMF.
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PCT/FR2012/052967 WO2013093322A1 (en) | 2011-12-22 | 2012-12-18 | Improved method for selectively oxidizing 5-hydroxymethyl furaldehyde |
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CN101544548B (en) * | 2008-03-26 | 2013-05-01 | 中国科学院大连化学物理研究所 | Method for preparing aldehydes or ketones by oxidizing alcohols with oxygen |
CN101565344B (en) * | 2008-04-25 | 2013-04-03 | 中国科学院大连化学物理研究所 | Method for preparing aldehyde or alkone by oxygen catalysis and alcohol oxidation under mild condition |
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CN101619050B (en) * | 2008-07-04 | 2011-06-22 | 中国科学院大连化学物理研究所 | Method for preparing 2,5-diformyl furan by catalyzing 5-hydroxy methyl furfural |
DE102009000662A1 (en) * | 2009-02-06 | 2010-08-12 | Evonik Degussa Gmbh | Process for the preparation of aldehydes and ketones from primary and secondary alcohols |
TR201908177T4 (en) * | 2009-05-14 | 2019-06-21 | Archer Daniels Midland Co | Process for the preparation of 2,5-furandicarboxylic acid (FDCA) by oxidation of 5- (alkyloxymethyl) furfural (AMF) with oxygen in the presence of a co (ii) or ce (iii) catalyst, a salt of bromide and a solvent. |
EP2556061A1 (en) | 2010-04-07 | 2013-02-13 | Novozymes A/S | A method of producing hydroxymethylfurfural |
DE102010030991A1 (en) * | 2010-07-06 | 2012-01-12 | Evonik Degussa Gmbh | Process for the preparation of 2,5-diformylfuran and its derivatives |
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2011
- 2011-12-22 FR FR1162343A patent/FR2984889B1/en not_active Expired - Fee Related
-
2012
- 2012-12-18 WO PCT/FR2012/052967 patent/WO2013093322A1/en active Application Filing
- 2012-12-18 JP JP2014548149A patent/JP2015502972A/en active Pending
- 2012-12-18 US US14/368,143 patent/US9365531B2/en not_active Expired - Fee Related
- 2012-12-18 EP EP12819081.6A patent/EP2794583A1/en not_active Withdrawn
- 2012-12-18 KR KR1020147016668A patent/KR20140106579A/en not_active Application Discontinuation
- 2012-12-18 CA CA2858187A patent/CA2858187A1/en not_active Abandoned
- 2012-12-18 CN CN201280063697.6A patent/CN104011036A/en active Pending
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Also Published As
Publication number | Publication date |
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WO2013093322A1 (en) | 2013-06-27 |
KR20140106579A (en) | 2014-09-03 |
CN104011036A (en) | 2014-08-27 |
US20140378691A1 (en) | 2014-12-25 |
FR2984889B1 (en) | 2017-02-24 |
FR2984889A1 (en) | 2013-06-28 |
US9365531B2 (en) | 2016-06-14 |
JP2015502972A (en) | 2015-01-29 |
CA2858187A1 (en) | 2013-06-27 |
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