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1 METHOD FOR CONVERTING NATURAL GAS AND CARBON DIOXIDE TO METIIANOL AND REDUCING CO2 EMISSIONS This application is a continuation-in-part of application Ser. No. 081405.302 ?led Mar. 16. 1995. abandoned. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is related to a method for the 2 by the methanol forming process creates other problems since carbon dioxide is a green house gas. the negative effects of which are only beginning to be understood. What is well understood. however. is the desire to reduce or eliminate carbon dioxide production and processes which reduce such emissions or in fact consume carbon dioxide as part of the process are desirable. Itisthereforeanobjectofthepresentinventiontoprovide an e?icient method for the production of methanol from 10 naturalgasandcarbondioxide. It is another object of the present invention to provide a method which produces a high yield of methanol per unit feedstock. 2. The gasiflcation of natural gas with carbon dioxide in accordancewiththefollowingreaction: co,+cn._>2r:o+2n2 (2) or a combination of these methods. As is clear to those skilled in the art the goal of each of This invention relates to the production of methanol by conversion of natural gas (which is comprised mainly of methane) and carbon dioxide. The process of the present invention is comprised of two (2) basic steps. the thermal decomposition of methane (natural gas) to produce elemen tal carbon and hydrogen gas followed by the catalyzed reaction of the hydrogen gas produced in step one of the process with carbon dioxide in a methanol synthesis reactor toproduce a gas stream containing methanol. The methanol may then be separated from the gas stream by known techniques. The carbon is separated as a co-product of the process. As shown above and described in more detail below. the process of the present invention consumes a substantial amount of carbon dioxide. The source of the carbon dioxide used in the present invention may be any sources. However. since as indicated above the net creation and/or emission of 5,767,165 productionofmethanol.andmore speci?cally.toamethod forproductionofmethanolbyconversionofnaturalgasand Itisyetanotherobjecttothepresentinventiontoprovide carbondioxidewhichmethodhasreducedcarbondioxide 15 amethodfortheproductionofmethanolhavingreduced emissions. 2. Description of the Prior Art Methanol. which was ?rst discovered in the late 1600's. has found use as a chemical feedstock and as an e?icient fuel. Its earliest and largest use to date is as a feedstock in theproductionofformaldehyde.Whileinrecentyearssuch use has decreased. methanol has found increasing use in the production of such materials as acetic acid and methyl tert-butylether(MTBE-a gasolineadditive).Inaddition. methanolisbeinguseddirectly(withincreasingdemand)as 25 a fuel in race cars. in farm equipment and. in some areas. as a general purpose automotive fuel. Methanol is fast becom ing an environmentally preferred alternative transportation fuel and can also serve as a clean stationary power plant fuel. There are several commercially viable methods of pro ducing methanol. These methods include: 1.The steam reforming of natural gas in accordance with thefollowingreaction: 35 carbondioxideemissions.Itisanotherobjectofthepresent invention to utilize waste CO2 from coal burning power plants and other sources to produce methanol to reduce overallnetCO2 emissions. It is another object of the present invention to produce carbon as a co-product to the production of methanol. Theaboveandotherobjectsandadvantagesofthepresent invention will become apparent from the following speci? cation read in conjunction with the annexed drawings. SUMMARY OF THE INVENTION these conventional methods is to produce or otherwise providecarbonmonoxideandhydrogeninamolarratioof45 carbondioxideissomethingtobereducedoravoided.the 1moleofCO to2molesofH2.Thesereactantsarethen reacted in 21methanol synthesis reactor in the presence of a catalysttoproducemethanolinaccordancewiththefollow ingexothermicreaction: process of the present invention may be most advanta geously operated in conjunction with a carbon dioxide producing process such as a fossil fuel ?red energy produc ingplant(i.e.e.g..acoal?redelectricalgenerationplantor waste incinerators). As is well known in the art such fossil 50 operated in conjunction with the present invention could 55 result in reduced carbon dioxide emissions since a substan tial portion of the carbon dioxide generated could be con sumed in the process of the present invention. Inaddition.asindicatedabove.theprocessofthepresent invention has the added feature of producing elemental carbon. The carbon which is removed from the thermal decomposition stepmay be stored.soldoremployed inother processes where elemental carbon is of value such as the productionofcarbonblack. The processes lmown in the art often produce carbon dioxide which. if fed to the methanol synthesis reactor. results in a lower methanol yielding reaction which com petes with the above reaction for the valuable hydrogen as follows: CO2+3H2—+CH3OH+H20 (4) (A more detailed discussion of the above processes can be found in Kirk-Othmer Encyclopedia of Chemical Technology. Vol. 15. pp 398-415 John Wiley & Sons (1978).) fuel ?red plants produce carbon dioxide as well as other gases which. if they are not otherwise dealt with. are discharged to the air. having many negative impacts on the environment such as global warming. However. such a plant Therefore. carbon dioxidemu stbe removed priortoentry into the methanol synthesis reactor. This obviously adds 65 additionalcomplexity.and.thereforeexpensetotheprocess. involvestheadditionalstepofgasi?cationofaportionofthe In addition. the creation and/or emission of carbon dioxide elemental carbon produced in step one with carbon dioxide An alternate embodiment of the present inventionPDF Image | CONVERTING NATURAL GAS AND CARBON DIOXIDE TO METHANOL
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