Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
  • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
  • C07D317/10—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 not condensed with other rings
  • C07D317/14—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 not condensed with other rings with substituted hydrocarbon radicals attached to ring carbon atoms
  • C07D317/18—Radicals substituted by singly bound oxygen or sulfur atoms
  • C07D317/20—Free hydroxyl or mercaptan
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
  • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
  • C07D317/10—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 not condensed with other rings
  • C07D317/14—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 not condensed with other rings with substituted hydrocarbon radicals attached to ring carbon atoms
  • C07D317/18—Radicals substituted by singly bound oxygen or sulfur atoms
  • C07D317/24—Radicals substituted by singly bound oxygen or sulfur atoms esterified
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D319/00—Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
  • C07D319/04—1,3-Dioxanes; Hydrogenated 1,3-dioxanes
  • C07D319/06—1,3-Dioxanes; Hydrogenated 1,3-dioxanes not condensed with other rings
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/02—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
  • C10L1/026—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only for compression ignition
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11C—FATTY ACIDS FROM FATS, OILS OR WAXES; CANDLES; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS, OILS, OR FATTY ACIDS OBTAINED THEREFROM
  • C11C3/00—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom
  • C11C3/003—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom by esterification of fatty acids with alcohols
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11C—FATTY ACIDS FROM FATS, OILS OR WAXES; CANDLES; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS, OILS, OR FATTY ACIDS OBTAINED THEREFROM
  • C11C3/00—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom
  • C11C3/04—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom by esterification of fats or fatty oils
  • C11C3/06—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom by esterification of fats or fatty oils with glycerol
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/18—Organic compounds containing oxygen
  • C10L1/185—Ethers; Acetals; Ketals; Aldehydes; Ketones
  • C10L1/1852—Ethers; Acetals; Ketals; Orthoesters
  • C10L1/1855—Cyclic ethers, e.g. epoxides, lactides, lactones
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/18—Organic compounds containing oxygen
  • C10L1/19—Esters ester radical containing compounds; ester ethers; carbonic acid esters
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L2200/00—Components of fuel compositions
  • C10L2200/04—Organic compounds
  • C10L2200/0461—Fractions defined by their origin
  • C10L2200/0469—Renewables or materials of biological origin
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L2200/00—Components of fuel compositions
  • C10L2200/04—Organic compounds
  • C10L2200/0461—Fractions defined by their origin
  • C10L2200/0469—Renewables or materials of biological origin
  • C10L2200/0476—Biodiesel, i.e. defined lower alkyl esters of fatty acids first generation biodiesel
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L2270/00—Specifically adapted fuels
  • C10L2270/02—Specifically adapted fuels for internal combustion engines
  • C10L2270/026—Specifically adapted fuels for internal combustion engines for diesel engines, e.g. automobiles, stationary, marine
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E50/00—Technologies for the production of fuel of non-fossil origin
  • Y02E50/10—Biofuels, e.g. bio-diesel

Definitions

• the present invention relates to a process for obtaining simultaneously several different compositions useful as biofuels where the synthetic procedure is characterized by a 100% atom economy.
• biodiesel The traditional manufacture of biodiesel is an area where these principles are most relevant since biodiesel, along with bioethanol, is currently the major biofuel in the market and, in addition, its manufacture is resource inefficient because not all the oil feedstock is converted into biofuel.
• the industrial method for biodiesel production currently involves the transesterification of triglycerides with excess methanol in the presence of a catalyst to yield fatty acid methyl esters (the desired fuel product) and glycerol (a byproduct without fuel properties).
• the resource inefficiency in a synthesis process is quantified by the atom economy, a well known factor that measures the percentage of atomic mass of starting materials that is incorporated into the desired final product of a chemical reaction, fatty acid methyl esters in this case.
• the atom economy of biodiesel production is 90% which is an unacceptable value for a large-volume commodity.
• obtaining glycerol is a problem since there is a huge uncertainty of a secondary market for large volumes of crude glycerol derived from biodiesel manufacture.
• EP2476740 (Al) relates to a process for the preparation of a mixture comprising fatty acid alkyl esters and acetals with fuel characteristics.
• the reaction takes place in a closed vessel and comprises reacting a mixture, obtained from the partial transesterification of a triglyceride with a lower alkanol, comprising glycerol, monoglycerides, diglycerides, triglycerides, fatty acid alkyl esters, and excess alkanol with an aldehyde, ketone or diether as a glycerol acetal forming agent in the presence of a solid acid catalyst to form a mixture of the fatty acid alkyl ester and the acetal of the glycerol to provide the composition.
• Figure 1 shows the reactions involved in the process of the invention (steps A- B1/B2-C) for obtaining compositions I, II, and IV.
• Figure 2 shows the additional reaction (step D) for obtaining compositions II and III.
• Figure 3 shows the whole process disclosed herein indicating the different steps and the compositions which are obtained.
• the present invention relates to a process for obtaining simultaneously several compositions comprising fatty acid alkyl esters (biodiesel), glycerol formal and the bioester of fatty acid glycerol formal ester.
• Figure 3 shows the whole process indicating the different steps and the compositions which are obtained.
• Said process comprises the following steps: (A) Reacting triglyceride, glycerol, preferably glycerol containing water, and dialkoxymethane, preferably dimethoxymethane, in the presence of an acid catalyst, preferably wherein the molar ratio of triglyceride to dialkoxymethane is between 1 to 6 and 1 to 30, wherein the molar ratio of triglyceride to glycerol is between 1 to 3 and 1 to 7 and wherein the dialkoxymethane contains 3 to 9 carbon atoms, thus forming two layers when the reaction is over.
• said catalyst is an homogeneous liquid, more preferably sulphuric acid, or said catalyst is heterogeneous, preferably an acidic ionic exchange resin.
• This step (A) is usually carried out at a high temperature, preferably between 55 and 85°C and more preferably at around 70°C for the homogeneous catalysis and at 85°C for the heterogeneous catalysis.
• the triglyceride to be used in this step has a natural origin (plant or animal) and includes, but without being limited thereto, sunflower oil, soy oil, coconut oil, palm oil, fats from cow, chicken, etc., and even used cooking oil can also be re-used.
• the upper layer comprises a mixture of fatty acid alkyl esters (fatty acid methyl ester if dimethoxymethane has been used in step (A)), fatty acid glycerol formal esters and an excess of dialkoxymethane and alkyl alcohol (methanol if dimethoxymethane has been used in step (A)) .
• the lower layer comprises a mixture of glycerol formal, excess glycerol and catalyst if an homogeneous catalyst, in particular polar catalyst, has been used (for example, sulphuric acid).
• dialkoxymethane is dimethoxymethane in step (A)
• fatty acid methyl esters and methanol are obtained in the upper layer along with fatty acid glycerol formal esters and an excess of dimethoxymethane.
• Bl Separating usually by distillation the dialkoxymethane and the alkyl alcohol from the upper layer, constituting the remaining components (fatty acid alkyl esters and fatty acid glycerol formal esters) the composition I.
• the excess of dialkoxymethane and alkyl alcohol is reused in the process.
• the alkyl alcohol is methanol
• this can be used in conventional biodiesel manufacture or recycled into dimethoxymethane through a conventional process in which methanol is oxidized to formaldehyde which, in a subsequent step, undergoes acetalization with methanol itself producing again dimethoxymethane
• any trace of acid present in said composition A can be neutralized.
• glycerol formal has much better fuel properties than glycerol and, in addition, can be converted into fatty acid glycerol formal ester (see step (D)).
• Steps A-B1/B2 are shown in figure 1.
• the compounds in the upper layer (fatty acid alkyl esters, fatty acid glycerol formal esters, dialkoxymethane and alkyl alcohol) can be reacted with a mixture of alkyl alcohol and homogeneous or heterogeneous acid catalyst in order to transform the fatty acid glycerol formal ester into fatty acid alkyl ester.
• the mixture is neutralized and the excess dialkoxymethane and alkyl alcohol are removed for example by decantation.
• two layers are formed.
• the resulting fatty acid alkyl esters are in the upper layer.
• Glycerol formal a byproduct of this reaction, remains in the lower layer and is usually isolated by distillation. Accordingly, from this step a composition III comprising fatty acid alkyl esters is obtained along with composition II comprising glycerol formal. If the dialkoxymethane is dimethoxymethane in step (C) and alkyl alcohol is methanol, the upper layer will comprise fatty acid methyl ester (FAME) which is the fundamental constituent of commercial biodiesel.
• said homogeneous acid catalyst is sulphuric acid and said heterogeneous acid catalyst is an acidic ionic exchange resin.
• composition IV fatty acid glycerol formal esters
• the transesterification catalyst is a titanium alkoxide wherein the alkoxide group contains 1 to 6 carbon atoms.
• Figure 2 depicts the chemical synthesis of step (D).
• additional non-reactive compounds may be added to the reaction vessels so that the final compositions (I, II, III or IV) may also include such additives or may be added once the final compositions are obtained.
• additives include, but not limited thereto, one or more additional components selected from the group consisting of: antioxidants, agents for increasing the octane number, biocides, chelating agents, detergents, dispersants, solvents, corrosion inhibitors, oxide inhibitors, and cetane improvers.
• the main advantages of the overall process are: 1) the process does not generate any by-product, 2) the process does not generate water, 3) the process can be integrated fairly easily to current biodiesel production systems and 4) similarly to biodiesel, the process uses any suitable source of triglycerides, in particular classical oil seeds but also non-food plant crops such as Jatropha Curcas or non- edible animal fats, 5) allows the conversion of a conventional biodiesel manufacturing plant in order to obtain FAME and glycerol formal instead of FAME and glycerol.
• the process disclosed herein, including all the possible embodiments, can be carried out as a continuous process or as a batch or discontinuous process.
• the present invention also relates to the products directly obtained by the process as disclosed in the present invention, i.e. composition I (fatty acid alkyl esters and fatty acid glycerol formal esters), composition II (glycerol formal), composition III (fatty acid alkyl esters) and composition IV (fatty acid glycerol formal esters).
• composition I fatty acid alkyl esters and fatty acid glycerol formal esters
• composition II glycerol formal
• composition III fatty acid alkyl esters
• composition IV fatty acid glycerol formal esters
• the fatty acid alkyl esters are fatty acid methyl esters.
• the present invention also relates to the use of the composition I as bio fuel, for example as automotive fuel or heating oil.
• the present invention further relates to the use of the composition II as biofuel in industrial applications, for example as heating oil.
• the present invention further relates to the use of the compositions III or IV as biofuel, for example as automotive fuel or heating oil.
• any of the following processes may contain further additives as those disclosed above.
• the upper layer containing excess of dimethoxymethane, methanol and a mixture of fatty acid methyl esters and fatty acid glycerol formal esters was subjected to distillation at atmospheric pressure.
• the fraction distilled at 42°C corresponds to pure dimethoxymethane (82.40 g, 1.083 mol, 11.71 eq) which is recycled in the process without further treatment.
• a fraction distilling at 65°C corresponding to pure methanol (9.32 g, 0.291 mol, 3.145 eq.) was obtained.
• the resulting mixture after distillation of volatile compounds was neutralised with an aqueous solution of potassium hydroxide (10% w/w) to remove traces of sulfuric acid and then water was added.
• composition II The residue of distillation which comprises unreacted glycerol (4.58 g, 0.050 mol, 0.538 eq.) and sulfuric acid are re-used in subsequent batches.
• the upper layer containing excess of dimethoxymethane, methanol and a mixture of fatty acid methyl esters and fatty acid glycerol formal esters was neutralised with a basic ion exchange resin and then subjected to distillation at atmospheric pressure.
• the fraction distilled at 42°C corresponds to pure dimethoxymethane (122.37 g, 1.608 mol, 19.369 eq) which is recycled in the process without further treatment.
• a fraction distilling at 65°C corresponding to pure methanol 14.82 g, 0.462 mol, 5.571 eq.
• the fraction distilled at 42°C corresponds to pure dimethoxymethane (168.16 g, 2.210 mol, 13.141 eq) which is recycled in the process without further treatment. Subsequently, a fraction distilling at 65°C corresponding to pure methanol (14.36 g, 0.448 mol, 2.665 eq.) was obtained. The resulting mixture after evaporation of volatile compounds was decanted forming two layers. The upper layer containing the mixture of fatty acid methyl esters and fatty acid glycerol formal esters was subjected to a first wash with an aqueous solution of potassium hydroxide (10% w/w) and a second wash with water.
• composition II The residue of distillation which contains unreacted glycerol (1.44 g, 0.016 mol, 0.093 eq.) is re-used in subsequent batches.
• Example 4 Heterogeneous catalysis 141.80 g of soy oil (0.166 mol, 1.000 eq), 44.95 g of glycerol (99% glycerol w/w) (0.489 mol, 2.943 eq), 207.74 g of dimethoxymethane (2.730 mol, 16.440 eq), and 14.61 g of an acidic ionic exchange resin were added to a closed vessel. The mixture was stirred at 290 rpm and heated at 85°C. The reaction mixture was maintained at 85°C and 1.5 bar for 5 hours. The catalyst was then filtered and the resulting mixture was distilled at atmospheric pressure.
• the fraction distilled at 42°C corresponds to pure dimethoxymethane (172.71 g, 2.270 mol, 13.668 eq) which is recycled in the process without further treatment. Subsequently, a fraction distilling at 65°C corresponding to pure methanol (14.61 g, 0.456 mol, 2.745 eq.) was obtained. The resulting mixture after evaporation of volatile compounds was decanted forming two layers. The upper layer containing the mixture of fatty acid methyl esters and fatty acid glycerol formal esters was subjected to a first wash with an aqueous solution of potassium hydroxide (10% w/w) and a second wash with water.
• composition II The residue of distillation which contains unreacted glycerol (5.10 g, 0.055 mol, 0.334 eq.) is re-used in subsequent batches.
• the upper layer containing excess of dimethoxymethane and methanol along with a mixture of fatty acid methyl esters and fatty acid glycerol formal esters was refluxed with 30 g of a methanolic solution of sulfuric acid (5% w/w). Two layers were separated. The upper layer was neutralized using an ion-exchange resin (basic form). After filtration, excess of dimethoxymethane and methanol were distilled-off yielding 78.1 g of a product containing fatty acid methyl esters (Composition III). The glycerol formal in the lower layer was distilled off to obtain 26 g of a pure product (Composition II). The residue of distillation which comprises unreacted glycerol and sulfuric acid was reused in subsequent batches.
• Glycerol formal (1354 g, 13.0 mol, 2 eq), and fatty acid methyl esters (1900g, 6.5 mol, 1 eq) were added to a reactor equipped with a vacuum distillation system,. The mixture was heated at 100°C and titanium isopropoxide was added. The reaction mixture was kept at 100°C and 10 mbar pressure for 12 hours. The distilled-off methanol (190 g, 5.93 mol, 0.91 eq) was collected in a distillation collector. Once the reaction is over, the excess of glycerol formal was distilled off at 20 mm Hg reduced pressure. The fraction distilling at 90°C corresponds to pure glycerol formal.
• reaction mixture was cooled tol room temperature.
• Water (190 g) was added and the reaction mixture was stirred for 30 minutes in order to hydrolyze the catalyst.
• the hydrolyzed catalyst was removed by centrifugationand washed with hexane and subsequently evaporated to dryness.
• the resulting orange oil was filtered through a 0.45 micrometer filter to yield 1735 g of fatty acid glycerol formal esters.

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