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19 12. The method of claim 10, wherein the exhaust stream is obtainedbycombustingthefuelinafossilfuelburningpower orindustrialplant. 13.Themethodofclaim1,Whichfurthercomprisesdehy drating the methanol under conditions suf?cient to produce dimethyl ether; using the dimethyl ether as the fuel or as a component of the fuel. 14. The method of claim 13, Which further comprises uti liZing. as the convenient energy storage and transportation materials, the methanol or dimethyl ether in order to mini miZeoreliminatethedisadvantagesordangersinherentinthe useandtransportationofhydrogen,LNG orLPG. 15.An environmentallybene?cialmethodofpreparinga reneWablefuel,Whichmethodcomprises: obtaining carbon dioxide from a natural or chemical source; and producinganenergystorageandtransportationmaterialor a fuel suf?cient to generate energy by hydrogenatively convertingthecarbondioxidethusobtainedundercon 20 ditions su?icient to produce methanol as the material or fuel. 16. The method ofclaim 15, Wherein the chemical source is an exhaust stream collected from the burning or combustion ofa fossilfuel. 25 17. The method of claim 15, Wherein the natural or chemi cal source of carbon dioxide is the atmosphere, an exhaust stream from a poWer or industrial plant, or a source accom panyingnaturalgas. 18.Themethodofclaim15,Whereinthecarbondioxideis 30 capturedandobtainedfromthesourceandisconvertedunder conditionssuf?cienttoproduceareactionmixturecontaining formic acid With concomittant formation of formaldehyde and small amounts ofmethanol and methane, folloWed, With outseparationofthereactionmixture,byatreatmentstep 35 conducted under conditions suf?cient to convert the formal dehyde to formic acid and methanol. 20 19.Themethodofclaim15,Whereinthecarbondioxideis captured and obtained from the source and is reduced under conditionssuf?cienttoproduceareactionmixturecontaining formic acid With concomittant formation of formaldehyde andsmallamountsofmethanolandmethane,augmentingthe reaction mixture by reacting, Without separation of the reac tion mixture, the formaldehyde into methanol With some of the formic acid used as a hydrogen source, and reacting some of the formic acid With methanol to form methyl formate, folloWedbycatalyticallyhydrogenatingthemethylformate under conditions su?icient to form methanol. 20.An environmentallybene?cialmethodofreducingthe carbondioxidecontentoftheatmospherebyrecyclingcarbon dioxideandproducingmethanolusingareductiveconversion of an available source of carbon dioxide from a natural or chemical source, Which method comprises: (A) reducing the carbon dioxide under conditions su?i cient to produce a reaction mixture containing formic acid With concomittant formation of formaldehyde and small amounts of methanol and methane, folloWed, Without separation of the reaction mixture, by a treat ment step conducted under conditions su?icient to con vert the formaldehyde to formic acid and methanol; or (B)augmentingthereactionmixtureof(A)byreactingthe formaldehyde With some of the formic acid as a hydro gen source, Without separation of the reaction mixture, into methanol, and by reacting some of the formic acid With methanol to form methyl formate, folloWed by catalytically hydrogenating the methyl formate under conditions suf?cient to form methanol; or (C) generating carbon monoxide from the carbon dioxide throughahightemperaturereactionWithcarbon,react ingthecarbonmonoxideWithmethanolproducedin(A) underconditionssu?icienttoformmethylformate,fol loWedbycatalytichydrogenationofthemethylformate under conditions su?icient to form methanol. * * * * * US 8,212,088B2PDF Image | CHEMICAL RECYCLING OF CO2 TO METHANOEDIMETHYL ETHER
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