WO2011082982A1 - Method for producing c1-c4-oxygenates by means of partial oxidation of hydrocarbons - Google Patents
Method for producing c1-c4-oxygenates by means of partial oxidation of hydrocarbons Download PDFInfo
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- WO2011082982A1 WO2011082982A1 PCT/EP2010/069560 EP2010069560W WO2011082982A1 WO 2011082982 A1 WO2011082982 A1 WO 2011082982A1 EP 2010069560 W EP2010069560 W EP 2010069560W WO 2011082982 A1 WO2011082982 A1 WO 2011082982A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/33—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/48—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups
- C07C29/50—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups with molecular oxygen only
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/215—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of saturated hydrocarbyl groups
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/582—Recycling of unreacted starting or intermediate materials
Definitions
- the present invention relates to a process for preparing C 1 -C 4 -oxygenates from a reactant stream A which comprises essentially a C 1 -C 4 -alkane or a mixture of C 1 -C 4 -alkanes by reacting a) a substream B of the educt stream A branches and reacts in a reactor with oxygen or an oxygen-containing gas stream C, wherein a portion of the Ci-C 4 alkane or a portion of the mixture containing Ci-C 4 alkanes to
- Ci-C 4 -oxygenates is reacted
- Ci-C 4 -oxyxygenates separated, with formation of a remaining low-boiling current E, characterized in that the low-current E without further workup and without union with the partial stream B is combined with the reactant stream A downstream of the branch point of the partial stream B.
- C 1 -C 4 oxygenates for example, methanol, formaldehyde, acrolein, acrylic acid, are important products of the chemical industry.
- Ci-C 4 oxygenates are usually not obtained on an industrial scale by direct partial oxidation of corresponding saturated hydrocarbons, but indirectly via intermediates.
- Ci- oxygenates such as methanol or formaldehyde are obtained indirectly from methane.
- methane is first reacted with steam and oxygen to synthesis gas, which is then catalytically reacted at higher pressures to methanol.
- the methanol may optionally be oxidized in a further process to formaldehyde.
- Ci-C 4 alkanes preferably of methane
- oxygen or oxygen-containing gases to the desired Ci-C 4 oxygenates
- the direct conversion of methane with Saustoff or oxygen-containing gases to Ci- oxygenates is currently the most interesting industrially interesting. It is known and described in many scientific publications and in the patent literature, for example in K. Tabata et al., Catalysis Reviews 2002, Vol. 44 (1), pages 1 to 58, in particular pages 1 to 25. This reaction can be carried out in the presence of Catalysts or be carried out without catalysts.
- Multi-stage reaction requires, inter alia, several reactors or reaction steps.
- the object of the present invention was to provide a process for the preparation of C 1 -C 4 -oxygenates by direct partial oxidation of C 1 -C 4 -alkanes, which does not have the disadvantages contained in the prior art, and in particular by high selectivity of the reaction Ci-C 4 alkane, for example methane, to the corresponding Ci-C 4 oxygenates, for example, methanol and / or formaldehyde, characterized.
- Ci-C 4 alkane for example methane
- Ci-C 4 oxygenates for example, methanol and / or formaldehyde
- the educt stream A contains essentially a C 1 -C 4 -alkane or a mixture of C 1 -C 4 -alkanes, for example methane, ethane, propane, n-butane, isobutane or a two-component mixture or multicomponent mixture of these C 1 -C 4 alkanes.
- the reactant stream A contains at least 80% by volume, preferably at least 90% by volume, of the C 1 -C 4 -alkane or of a mixture of C 1 -C 4 -alkanes.
- the possible remainder of the educt stream A consists as a rule of nitrogen, hydrogen sulfide, carbon monoxide, carbon dioxide, water, other saturated or unsaturated hydrocarbons, noble gases, organic sulfur compounds and / or other impurities, in a total amount usually in the range of 0 to 20 vol .-%, based on the reactant stream A.
- the reactant stream A contains a mixture of C 1 -C 4 alkanes.
- the educt stream A preferably comprises a mixture of C 1 -C 4 -alkanes which contains at least 70% by volume of methane, preferably of at least 80% by volume of methane, and optionally also ethane, propane, optionally butane and higher hydrocarbons.
- the reactant stream A contains essentially natural gas as an example of a mixture of C 1 -C 4 -alkanes.
- the main component of natural gas is methane.
- a typical composition of natural gas is: 75 to 99% by volume of methane, 0.01 to 15% by volume of ethane, 0.01 to 10% by volume of propane, up to 0.06% by volume of butane and higher Hydrocarbons, up to 0.30% by volume of carbon dioxide, up to 0.30% by volume of hydrogen sulphide, up to 0.15% by volume of nitrogen, up to 0.05% by volume of noble gas (s).
- the reactant stream A contains essentially methane or substantially propane. Most preferably, the starting material stream A contains essentially methane.
- a partial stream B is branched off.
- the amount of the partial stream B, based on the reactant stream A, is not critical according to the current state of knowledge.
- the partial stream B is from 1 to 100% by volume, preferably from 10 to 100% by volume, particularly preferably from 20 to 60% by volume, of the educt A.
- the partial stream B is then combined before entry into a reactor or already in a reactor with oxygen or an oxygen-containing gas stream C and allowed to react in the reactor, whereby a part of the Ci-C4-alkane or a part of the mixture, which Ci-C4- Alkanes is converted to Ci-C4-oxygenates.
- Partial stream B and / or gas stream C can be heated before entry into the reactor, for example, as described below, by the product stream D in a heat exchanger.
- the molar ratio of the total amount of C 1 -C 4 -alkane (from substream B): oxygen (from gas stream C) is generally in the range of 99.9: 0, 1 to 75: 25. preferably in the range of 99: 1 to 90: 10, more preferably in the range of 98: 2 to 92: 8.
- the oxygen-containing gas stream C usually contains oxygen in the range from 0.1 to 100% by volume, preferably in the range from 19 to 100% by volume.
- a well-suited oxygen-containing gas stream C is air.
- the reaction of the partial stream B with oxygen or an oxygen-containing gas stream C can take place in the form of a homogeneous gas phase reaction, a flame, in a burner or on a catalytic contact or a catalytically active surface or otherwise.
- reactor in the present application is to be understood as a reaction zone, the reaction zone being able to be represented inter alia by one reactor, several reactors connected in series or one cascaded reactor or several cascaded reactors.
- the reaction of the partial stream B with oxygen or an oxygen-containing gas stream C can in principle be carried out in all reactor types known from the prior art. Examples of well suited reactors are found in Levenspiel, Octave; Chemical Reaction Engineering (3rd Edition) John Wiley & Sons (1999).
- the reaction of the partial stream B with oxygen or an oxygen-containing gas stream C in a reactor usually takes place in the temperature range of 40 to 900 ° C, preferably in the temperature range of 60 to 800 ° C, more preferably in the temperature range of 100 to 700 ° C, especially in the temperature range from 150 to 650 ° C, and at a pressure in the range of 1 to 200 bar, preferably in the range of 5 to 150 bar, more preferably in the range of 15 to 100 bar instead.
- a part of the Ci-C4-alkane, or a portion of the mixture comprising Ci-C 4 -alkanes converted to Ci-C4 oxygenates.
- the corresponding conversion of the Ci-C4 alkane or a mixture of Ci-C 4 alkanes to form the corresponding Ci-C4 oxygenates is in the range of 0.1 to 10 mol%, preferably in the range of 1 to 8 mol -%, more preferably in the range of 3 to 7 mol%.
- the selectivity of the inventive reaction of the Ci-C 4 alkane or a mixture of Ci-C 4 alkanes to the corresponding Ci-C 4 -oxygenates is high and is at least 70%, preferably in the range of 80 bis 100%, more preferably in the range of 90 to 100%.
- the reaction of the partial stream B with oxygen or an oxygen-containing gas stream C in a reactor can be influenced not only by heat supply and / or pressure but also by carrying out the reaction in the presence of a heterogeneous catalyst.
- Such catalysts are known.
- the following groups are mentioned:
- a catalytically active surface for example the inner surface of the reactor, can also be used, as described, for example, in WO 2009/010407.
- the following reactors are well suited, which are known per se: fixed bed or tube bundle reactor, fluidized bed reactor , Horde reactor. Step b)
- the product stream D) resulting from step a) contains, depending on the composition of the partial stream B and the further reaction conditions, C 1 -C 4 oxygenates, for example as d-oxygenates methanol and / or formaldehyde (methanal), as C 2 oxygenates ethanol and / or Acetaldehyde (Ethanal), as C3 oxygenates n-propanol, isopropanol (2-propanol), acetaldehyde (propanal), acetone (dimethyl ketone), acrolein and acrylic acid, as C 4 oxygenates n-butanol, n-butanal, iso Butanol, maleic anhydride.
- C 1 -C 4 oxygenates for example as d-oxygenates methanol and / or formaldehyde (methanal), as C 2 oxygenates ethanol and / or Acetaldehyde (Ethanal), as C3 oxygenates n-propanol, isopropanol
- the product stream D usually has a temperature in the range from 40 to 800 ° C., preferably in the temperature range from 60 to 700 ° C., more preferably in the temperature range from 100 to 600 ° C., in particular in the temperature range from 150 to 550 ° C.
- the product stream D leaves the reactor and can be sent without further detours directly to the apparatus for separating the Ci-C 4 oxygenates.
- the product stream D leaves the reactor and flows through a heat exchanger in which also partial stream B and / or gas stream C, preferably in countercurrent, occur before they enter the reactor.
- partial stream B and / or gas stream C are heated before they reach the reactor.
- Product stream D leaves the heat exchanger and generally passes without further detours to the device for separating the Ci-C 4 oxygenates.
- the Ci-C 4 -oxyxygenates are separated at least 90 mol%, generally almost completely from the product stream D by conventional methods and the usual devices.
- Such processes are, for example, absorption with a solvent ("washing"), distillation, condensation, adsorption, membrane processes or a combination of these processes, for example distillation and condensation, preference being given to absorption with a solvent (“washing”).
- Preferred solvents for this purpose are the solvents in which the C 1 -C 4 -oxyxygenates dissolve well, for example water, C 1 -C 10 -hydrocarbons having at least one OH group, such as glycols or polyglycols.
- Suitable devices for the described separation of the C 1 -C 4 oxygenates are, for example, absorption columns, adsorption columns, condensation tanks.
- the separation devices preferably the devices for absorption with a solvent or solvent mixture, may be connected in series or else side by side, also in this case optionally in series.
- Ci-C 4 -oxyxygenates formed in step a) are separated off by the described separation processes.
- the product stream D is cooled by the application of the separation techniques described.
- the product stream D can also be cooled before it enters the apparatus for separating off the C 1 -C 4 oxygenates by customary methods.
- the low-boiler stream E contains, in addition to unreacted in step a) and further not separated Ci-C 4 alkanes or a mixture of unreacted or not separated Ci-C 4 alkanes, optionally formed carbon dioxide, carbon monoxide and optionally already in the reactant stream A contained substances such as nitrogen, noble gas (s), carbon dioxide, carbon monoxide or other, formed for example in step a), by-products and other already contained in reactant stream A impurities.
- the low-boiler stream E preferably contains a total amount of carbon dioxide in the range from 0 to 3% by volume, based on the low-boiler stream E.
- the low-boiler stream E preferably contains water in an amount in the range from 0 to 6% by volume, based on the low-boiler stream E.
- the low-boiler stream E is combined with the reactant stream A downstream of the branch point of the partial stream B without further work-up and without combining with the partial stream B. In this way, the low-boiler stream E as such is not recycled back to the reactor.
- the method according to the invention thus operates in the "straight pass".
- the high-boiler stream F generally passes into one or more, preferably in series, evaporators (also called “flash") in which a lower pressure than in the upstream plant parts, for example reactor or separation device, such as absorption column
- evaporators also called “flash”
- the pressure in the first or only evaporator is usually in the range from 5 to 30 bar and in the second or each further evaporator usually around 10 to 20 bar lower than in the previous one, but not below 0.1 bar
- Evaporator G usually still contains C 1 -C 4 -alkanes and is usually brought back to the pressure prevailing in the device for separating the streams E and F, and fed into this device.
- the high boiler fraction from the first evaporator H is usually fed into the second evaporator and there into a low boiler I stream, usually containing Ci-C 4 alkanes, carbon dioxide, carbon monoxide, water, little Ci-C 4 oxygenates, and a High-boiling current J, containing essentially the washing liquid and the Ci-C 4 -oxygenate, separated.
- the low-boiler stream I is usually disposed of as exhaust gas, for example burnt.
- the high-boiler stream J is generally introduced into a separating device, for example a device for carrying out the abovementioned separation processes a distillation column is fed with which the Ci-C 4 -oxygenates L are isolated from the other components of the high-boiling current J.
- the remainder M essentially containing the "washing liquid" and water, can be separated, for example, via an evaporator into the wastewater N and the washing liquid O.
- the washing liquid O together with fresh washing liquid P can be returned to the apparatus for separating the streams E and F. be supplied.
- FIG. 1 shows a process flow diagram for an example of the method according to the invention.
- the educt stream A is natural gas which flows through a conventional pipeline. All natural gas types are possible, for example those described above.
- a partial flow B is branched off.
- the amount of the partial stream B, based on the natural gas stream A, is not critical according to the current state of knowledge.
- the partial stream B usually makes up from 1 to 100% by volume, preferably from 10 to 100% by volume, particularly preferably from 20 to 60% by volume, of the natural gas stream A.
- the partial stream B is then combined before entry into a reactor or already in a reactor with oxygen or an oxygen-containing gas stream C and allowed to react in the reactor, wherein a portion of the natural gas to methanol and / or formaldehyde, preferably methanol, is reacted.
- Partial stream B and / or gas stream C can be heated before entry into the reactor, for example, as described below, by the product stream D in a heat exchanger.
- the molar ratio of the total amount of Ci-C 4 alkane (from the partial stream B): oxygen (from the gas stream C) is usually in the range of 99.9: 0.1 to 75: 25, preferably in the range of 99: 1 to 90:10, more preferably in the range of 98: 2 to 92: 8.
- the oxygen-containing gas stream C usually contains oxygen in the range from 0.1 to 100% by volume, preferably in the range from 19 to 100% by volume.
- a suitable oxygen-containing gas stream C is air.
- the reaction of substream B with oxygen or an oxygen-containing gas stream C may be in the form of a homogeneous gas phase reaction, a flame, in a burner or on a catalytic contact or otherwise.
- the nature of the reactor is not critical according to current knowledge.
- the term "reactor" in the present application is to be understood as a reaction zone, the reaction zone being able to be represented inter alia by one reactor, several reactors connected in series or one cascaded reactor or several cascaded reactors.
- reaction of the partial stream B with oxygen or an oxygen-containing gas stream C can in principle be carried out in all reactor types known from the prior art. Examples of well suited reactors are found in Levenspiel, Script; Chemical Reaction Engineering (3rd Edition) John Wiley & Sons (1999).
- the reaction of the partial stream B with oxygen or an oxygen-containing gas stream C in a reactor usually takes place in the temperature range of 40 to 900 ° C, preferably in the temperature range of 60 to 800 ° C, more preferably in the temperature range of 100 to 700 ° C, in particular in the temperature range from 150 to 650 ° C and at a pressure in the range of 1 to 200 bar, preferably in the range of 5 to 150 bar, more preferably in the range of 15 to 100 bar instead.
- part of the natural gas is converted to methanol and / or formaldehyde, preferably methanol.
- Natural gas to methanol and / or formaldehyde preferably methanol is in the range of 0.1 to 10 mol%, preferably in the range of 1 to 8 mol%, particularly preferably in the range of 3 to 7 mol%.
- the selectivity of the preferred conversion of the natural gas to methanol and / or formaldehyde, preferably methanol is high and is at least 70%, preferably in the range of 80 to 100%, particularly preferably in the range of 90 to 100%.
- the reaction of the partial stream B with oxygen or an oxygen-containing gas stream C in a reactor can be influenced not only by heat supply and / or pressure but also by carrying out the reaction in the presence of a heterogeneous catalyst. Such catalysts are known.
- a catalytically active surface for example the inner surface of the reactor, can also be used, as described, for example, in WO 2009/010407.
- reactors for the inventive reaction of the natural gas to methanol and / or formaldehyde, preferably methanol in the presence of heterogeneous catalysts, the following reactors are well suited, which are known per se: fixed-bed or tube bundle reactor, fluidized bed reactor, tray reactor.
- the product stream D resulting from step a) comprises methanol and / or formaldehyde, preferably methanol, as essential constituents from the group of the C 1 -C 4 oxygenates.
- the product stream D usually has a temperature in the range from 40 to 800 ° C., preferably in the range from 60 to 700 ° C., more preferably in the range from 100 to 600 ° C., in particular in the range from 150 to 500 ° C.
- the product stream D leaves the reactor and can be sent without further detours directly to the apparatus for the separation of the methanol and / or formaldehyde, preferably methanol.
- the product stream D leaves the reactor and flows through a heat exchanger in which also partial stream B and / or gas stream C, preferably in countercurrent, occur before they enter the reactor.
- partial stream B and / or gas stream C are heated before they reach the reactor.
- Product stream D leaves the heat exchanger and generally passes without further detours to the device for the separation of the methanol and / or formaldehyde, preferably methanol.
- the methanol and / or formaldehyde, preferably methanol is at least 90 mol%, generally almost completely separated from the product stream D by conventional methods and the usual devices.
- Such methods are, for example, absorption with a solvent ("washing"), distillation, condensation, adsorption, membrane processes or a combination of these processes, for example distillation and condensation.
- Preferred solvents for this purpose are the solvents in which methanol and / or formaldehyde dissolve well, for example water, C 1 -C 10 -alcohols having at least one OH group, such as glycols or polyglycols.
- Suitable devices for the described separation of the methanol and / or formaldehyde, preferably methanol, are for example absorption columns, adsorption columns, condensation tanks.
- the separation devices preferably the devices for absorption with a solvent or solvent mixture, may be connected in series or else side by side, also in this case optionally in series.
- At least 90 mol% of the methanol formed in step a) and / or formaldehyde, preferably methanol, are separated off by the separation processes described.
- the product stream D is cooled by the application of the separation techniques described.
- the product stream D can also be cooled before it enters the device for separating the methanol and / or formaldehyde, preferably methanol, by customary methods.
- the low-boiler stream E comprises carbon dioxide, carbon monoxide and any other substances already present in the reactant stream A, such as nitrogen, noble gas (s), carbon dioxide, carbon monoxide or others, for example in step a, in addition to unconverted natural gas in step a) ), by-products and other impurities already contained in reactant stream A.
- the low-boiler stream E preferably contains a total amount of carbon dioxide in the range from 0 to 3% by volume, based on the low-boiler stream E.
- the low-boiler stream E preferably contains water in an amount in the range from 0 to 6% by volume, based on the low-boiler stream E.
- the low-boiler stream E is combined with the reactant stream A downstream of the branch point of the partial stream B without further work-up and without combining with the partial stream B. In this way, the low-boiler stream E as such is not recycled back to the reactor.
- the method according to the invention thus operates in the "straight pass".
- the methanol and / or formaldehyde, preferably methanol, can be isolated from the high-boiling-point stream F by the customary separation processes described above, that is to say from the further constituents of the high-boiling-point stream F, for example "washing liquid".
- the high-boiler stream F generally passes into one or more, preferably in series, evaporators (also called “flash”) in which a lower pressure than in the upstream plant parts, for example reactor or separation device, such as absorption column , prevails.
- evaporators also called “flash”
- the pressure in the first or only evaporator is in the range of 5 to 30 bar and in the second or each further evaporator usually around 10 to 20 bar lower than in the previous, but not below 0.1 bar.
- the low-boiling fraction from the first evaporator G usually still contains C 1 -C 4 -alkanes and is usually brought back to the pressure prevailing in the device for separating the streams E and F, and fed into this device.
- the high boiler fraction from the first evaporator H is usually fed into the second evaporator and there in a low-current I, usually containing Ci-C 4 alkanes, carbon dioxide, carbon monoxide, water, little Ci-C 4 oxygenates, and a high-boiling current J containing substantially the washing liquid and methanol and / or formaldehyde, preferably methanol, separated.
- a low-current I usually containing Ci-C 4 alkanes, carbon dioxide, carbon monoxide, water, little Ci-C 4 oxygenates
- J high-boiling current J containing substantially the washing liquid and methanol and / or formaldehyde, preferably methanol, separated.
- the low-boiler stream I is usually disposed of as exhaust gas, for example burnt.
- the high-boiler stream J is generally fed into a separation device, for example a device for carrying out the separation processes described above, preferably a distillation column with which methanol and / or formaldehyde, preferably methanol L, is isolated from the further components of the high-boiling-point stream J.
- the remainder M essentially containing the "washing liquid" and water, can be separated, for example, via an evaporator into the waste water N and the washing liquid O.
- the washing liquid O together with fresh washing liquid P can again be used to separate the device E and F are supplied.
- Figure 1 also provides a process flow diagram for one embodiment of the preferred method.
- the inventive method was using the software ASPENplus for a stream B of virtually pure methane, a conversion of methane of 5 mol%, a conversion of oxygen of 100 mol%, a methanol selectivity of 90% (balance to CO2), a Annual capacity of methanol of 1 million tonnes at a reaction temperature of 500 ° C and a pressure of 50 bar simulated.
- Mass flows of 1394 t / h of methane and 90 t / h of oxygen were used.
- the methane was diverted directly from a pipeline (feedstream A) at a pressure of 50 bar (e.g., just before a compression station).
- Stream B and stream C to the reactor were heated from product stream D from the reactor to a temperature of 412 ° C while the product stream D was cooled to a temperature of 150 ° C.
- the total amount of heat exchanged was 462 MW.
- the released heat of reaction was 237 MW under the above conditions. This heat is used in part (131 MW) for preheating the feed stream B and C and for generating heating steam (106 MW).
- the product stream D was then passed into a wash column, the resulting methanol was absorbed by means of a suitable solvent of 2.4 wt .-% water in triethylene glycol.
- the necessary mass flow of solvent was 1 150 t / h.
- the temperature of the gas stream D was cooled down there to about 41 ° C.
- the remaining gas stream E (about 1342 t / h), which in addition to 0.5 mol% CO2 mainly methane contained was recycled without further workup and without unification with the partial stream B downstream of the branch point of the partial stream B in the pipeline.
- the methanol-loaded solvent stream F was introduced into evaporator 1 and expanded to 18 bar.
- the resulting gas stream G was then compressed again to 50 bar and returned to the absorption column.
- the loading solvent stream H was heated with the aid of heating steam to a temperature of 1 10 ° C and passed at a pressure of 2.5 bar to the evaporator 2, where 2.2 t / h of gas I were separated.
- the latter was composed as follows: 93.7 mol% methane, 2.5 mol% carbon dioxide, 3.4 mol% methanol and 0.4 mol% water.
- the resulting solvent stream J then passes under 0.8 bar in a distillation column, where the desired reaction product methanol is isolated and the solvent is regenerated.
- the required heat of vaporization was 52.7 MW, the released heat of condensation 88.7 MW. In this way, a total of 125 t / h methanol could be separated during the rectification.
- the specific power consumption was 2.4 MW. This resulted in a Schudampfgutschrift (in the sense of generated or recovered heating steam) of 122.4 t / h and a cooling water consumption of 4900 m3 / h. Examples 2 to 8
- Examples 2 to 8 describe the influence of different process conditions, for example reaction temperature, pressure, conversion or selectivity, on the process according to the invention. They are summarized in Table 1.
- Example 1 For an annual methanol capacity of 1 million tonnes t.
- CO2 was assumed to be the only by-product.
- the results of Examples 1-8 show that the process described above is an economically very attractive process for the preparation of Ci-C 4 -oxygenates, preferably methanol, by direct oxidation of the corresponding Ci-C 4 -alkanes, which has the disadvantages of im
- the prior art described method no longer has.
- the inventive method is characterized by a simpler process concept and concomitantly by significantly lower investment costs.
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CN2010800569794A CN102656135A (en) | 2009-12-15 | 2010-12-14 | Method for producing C1-C4-oxygenates by means of partial oxidation of hydrocarbons |
EP10796339A EP2516370A1 (en) | 2009-12-15 | 2010-12-14 | Method for producing c1-c4- oxygenates by means of partial oxidation of hydrocarbons |
RU2012129677/04A RU2012129677A (en) | 2009-12-15 | 2010-12-14 | METHOD FOR PRODUCING C1-C4 OXYGENATES BY PARTIAL OXIDATION OF HYDROCARBONS |
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EP09179320.8 | 2009-12-15 | ||
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US4243613A (en) * | 1977-09-24 | 1981-01-06 | Chemische Werke Huls Aktiengesellschaft | Process for the manufacture of mixtures of formaldehyde and methanol by partial oxidation of methane |
WO2005037746A1 (en) | 2003-10-15 | 2005-04-28 | Eskom Holdings Limited | Conversion of alkanes having at most 5 carbonatoms to alcohols and/or aldehydes using a platinum complex catalyst |
WO2009010407A1 (en) | 2007-07-19 | 2009-01-22 | Total Petrochemicals Research Feluy | Process for the selective oxidation of methane |
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---|---|---|---|---|
CN101199939B (en) * | 2007-12-21 | 2010-09-29 | 中国科学院山西煤炭化学研究所 | Catalyst for synthesizing methanol and formaldehyde from methane oxidation and preparation and application thereof |
CN101225020B (en) * | 2008-02-13 | 2011-01-26 | 上海华谊丙烯酸有限公司 | Method for preparing isobutanol by using mixed C4 or isobutene as raw materials |
-
2010
- 2010-12-14 EP EP10796339A patent/EP2516370A1/en not_active Withdrawn
- 2010-12-14 RU RU2012129677/04A patent/RU2012129677A/en not_active Application Discontinuation
- 2010-12-14 WO PCT/EP2010/069560 patent/WO2011082982A1/en active Application Filing
- 2010-12-14 CN CN2010800569794A patent/CN102656135A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2201429A1 (en) * | 1972-01-13 | 1973-07-19 | Huels Chemische Werke Ag | PROCESS FOR THE PREPARATION OF MIXTURES OF FORMALDEHYDE AND METHANOL BY PARTIAL OXYDATION OF METHANE |
US4243613A (en) * | 1977-09-24 | 1981-01-06 | Chemische Werke Huls Aktiengesellschaft | Process for the manufacture of mixtures of formaldehyde and methanol by partial oxidation of methane |
WO2005037746A1 (en) | 2003-10-15 | 2005-04-28 | Eskom Holdings Limited | Conversion of alkanes having at most 5 carbonatoms to alcohols and/or aldehydes using a platinum complex catalyst |
WO2009010407A1 (en) | 2007-07-19 | 2009-01-22 | Total Petrochemicals Research Feluy | Process for the selective oxidation of methane |
Non-Patent Citations (3)
Title |
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K. TABATA ET AL., CATALYSIS REVIEWS, vol. 44, no. 1, 2002, pages 1 - 58 |
LEVENSPIEL, OCTAVE: "Chemical Reaction Engineering", 1999, JOHN WILEY & SONS |
M.J. BROWN; N.D. PARKYNS, CATALYSIS TODAY, vol. 8, 1991, pages 305 - 335 |
Also Published As
Publication number | Publication date |
---|---|
RU2012129677A (en) | 2014-01-27 |
EP2516370A1 (en) | 2012-10-31 |
CN102656135A (en) | 2012-09-05 |
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