Method for preparing methanol

FIELD: organic chemistry, chemical technology.

SUBSTANCE: method for synthesis of methanol involves the following stages: removing hydrocarbon gas to be processed, sulfur elimination, catalytic steam conversion to obtain converted gas, heat utilization with separation of water, synthesis of methanol and separation of condensed methanol. Hydrocarbon gas with unstable composition is removed under pressure 0.001 MPa, not less, and sulfur elimination of hydrocarbon gas with unstable composition is combined with stage of step-by-step stabilization of pressure to form steam-gaseous mixture. Methanol synthesis is carried out for at least two successive flow steps with reducing volume of catalyst under pressure 1.5 MPA, not less, and separation of methanol between successive stages. Method provides significant reducing cost of gas processing and service of devices and allows carrying out the processing in mobile traveling devices in field conditions. Invention can be used in processing gas with unstable composition, for example, casing-head petroleum gas in petroleum-extracting holes, in field conditions in small traveling devices.

EFFECT: improved preparing method.

2 cl, 2 dwg

 

The invention relates to the field of chemical technology and can be used in the processing of unstable gas composition, such as associated gas in oil wells, in the field of small mobile units.

Published in the patent literature information not identified technical solutions for the processing of associated gas or gas with a volatile composition with methanol obtaining.

Known methods of processing natural gas to methanol obtaining. In these ways it is known that processing of natural gas is under high pressure with which the gas is delivered to the processing plants on highways. In addition, a necessary condition for the implementation of the known methods are stringent requirements on the composition of the gas, and the synthesis of methanol at elevated (up to 7,0-10,0 MPa) pressure, which is achieved by using powerful and expensive compressors, stationary chemical plants and oil refineries.

At the present time, is the problem of processing of associated petroleum gases, as well as new gas fields with unstable composition of the gas that does not comply with the requirements of GOST. Existing technologies such gases or flared, causing harm to the environment and negatively impact the t on the environment, or there is a need of paving the roads to existing pipelines or to the nearest processing plant. In the process of transporting the gas portion of the hydrocarbons transported gas needed for processing, lost in a multistage compression cycles and successive cooling overcome the hydraulic resistance of the long trunk pipelines, as their content in gas with a volatile composition is too low. So don't justify the cost of building pipelines and the transportation of gas from the field to processing plants.

A known method of producing methanol from synthesis gas, comprising two stages of the synthesis of methanol at elevated temperature and pressure, where the first stage of the synthesis are in the flow reactor, and the second stage in the reactor recycle, when applying for a second stage is added to the gas supplied to the second stage, additional gas stream containing an excess of hydrogen or carbon oxides, for regulating the volumetric ratio of CO/(H2+CO2). This method also includes the preliminary recovery of oxide of carbon dioxide in the secondary reactor (patent RF №2052444, 31/04 C 07 C, 1996).

The disadvantage of this method amlawdaily energy consumption, including the increase of energy consumption for the process of recovery of oxides, as well as the need to use compressors to achieve a given pressure on the operation of synthesis, requiring constant monitoring and care.

A method of refining natural gas with methanol obtaining, including steam-oxygen conversion of natural gas to synthesis gas, waste heat, partial removal from synthesis gas, carbon dioxide, drying, compression to a pressure of 8.5 and 9.0 MPa and methanol synthesis in two stages - preliminary flow-pressure steam-oxygen conversion and basic circulation (patent RF №2135454, IPC 6 31/04 C 07 C, 1999).

The disadvantage of this method is the use of steam-oxygen conversion, cost-effective security process, as well as the necessity of removing the excessively produced carbon dioxide, which entails significant energy consumption. For the implementation of this method requires expensive and precise equipment, such as compressors.

A known method of producing methanol, comprising a steam-oxygen conversion of natural gas, the allocation of carbon dioxide from the converted gas, followed by drying and compression to a pressure of 8.5 to 9.5 MPa and the synthesis of methanol from carbon oxides and hydrogen in Polock the x columns (RF patent No. 2099320, IPC 6 07 With 29/15, 1997).

The disadvantage of this method is the use of steam-oxygen conversion, cost-effective security process, as well as the necessity of removing the excessively produced carbon dioxide, which entails significant energy consumption. For the implementation of this method requires expensive equipment, such as compressors, requiring constant monitoring and care.

A method of refining natural gas with methanol obtaining, including the selection of natural gas under pressure, heat, gas desulfurization, catalytic steam reforming of obtaining the converted gas, waste heat, gas compression, synthesis of methanol circulation unreacted gas heat recovery the latest and separating the condensed methanol (patent of the Russian Federation "2124387, IPC 6 07 With 27/26, 1999). This decision was made as a prototype.

The disadvantage of the prototype are significant energy consumption, the use of compressors to ensure the lifting pressure to the required level.

The problem solved by the invention, ensuring the production of methanol by processing of associated petroleum gases, as well as new gas fields with unstable composition of the gas at low pressure without the use of expensive compressors for mobile mo is safe installations.

The problem is solved due to the fact that in the known method of producing methanol, comprising the selection of the processed gas, desulfurization, catalytic steam reforming of obtaining the converted gas heat recovery, methanol synthesis, Department of condensed methanol, in accordance with the invention are selected unstable gas composition under a pressure of not less than 0.001 MPa, desulphurized gas combine with stage speed stabilization pressure methanol synthesis spend not less than two consecutive flow stage with decreasing volume of catalyst at a pressure not less than 1.5 MPa, and the Department of methanol produced between successive steps.

Manual stabilization of the gas pressure produced by using the gas-jet apparatus.

The technical result of solving the problem lies in the fact that due to the unstable gas processing composition provides a solution to both environmental and economic problems associated with the utilization of associated petroleum gases, as well as new gas fields with unstable composition of the gas.

Due to the fact that the processing gas is produced at low pressures: converting at a pressure of 0.001 MPa, and the synthesis of methanol at a pressure of 1.5 MPa, there is no need for expensive compressor is in, requiring continuous monitoring process of their operation, which significantly reduces the cost of gas processing and maintenance of installations and allows processing on mobile installations practically in the field.

In addition, carrying out the process at low pressures allows you to combine gas desulfurization with stage manual stabilization of the pressure using a gas-jet apparatus, which also affects the cost reduction process of methanol production.

The synthesis of methanol is not less than two consecutive flow stage with decreasing volume of the catalyst and the separation of methanol between successive stages eliminates the need for circulation of synthesis gas to synthesis in flow reactors isothermal and adiabatic type at low pressures in a wide range of bulk velocity.

The implementation of this method will allow to process the unstable gas composition directly in the mining areas with the receipt of methanol and its subsequent use for household needs. Thus you can get rid of the torches over the oil fields or fields where the gas produced does not meet the requirements of GOST. And not to spend funds for the construction of gas pipelines to pererabotki the natural gas.

Figure 1 - block diagram of the stages of the process.

Fig 2 diagram of the process of obtaining methanol.

Way to obtain is as follows (see figure 2). Hydrocarbon unstable gas composition and pressure of 0.001-20 MPa), after, if necessary, the cleaning unit from sulfur-containing compounds (figure 2 conventionally not shown), is fed to the stabilization unit pressure 1, where the latter is stabilized in the range of 2-5 MPa with the formation of the vapor-gas mixture (steam:gas ratio=4:1).

Then pre-heated to 650-750°gas-vapor mixture is subjected to catalytic steam reforming in a tubular furnace 2. To increase the overall thermal efficiency of the installation is provided by the waste heat of flue gases tubular furnace 2, aimed at heating furnace gas, steam e, and overheating of the gas mixture before entry into the reaction tube. The waste heat of flue gases is carried out in BTA (block heat transfer equipment) 3.

Converted gas after leaving the reaction tube is routed through a heat exchanger 4, the boiler 5, the heater 6 and the capacitor 7, where the heat recovery and the separation of water in front of the unit for methanol synthesis.

The methanol synthesis is carried out in block isothermal reactor at a temperature of 180-280°and a pressure of 2-5 MPa.

Drained the gas at the Le capacitor 7 flows into the heater 8, where its temperature rises to 180-280°and then sent in an isothermal reactor 9. After the reactor gas through the heat exchanger 10 and the condenser 11, where the cooling of the reaction gas with the Department of methanol. After the heat exchanger 9, the gas is fed to the second step of the synthesis is identical to the first, and so on

Depending on the composition and pressure of the source gas, the number of stages of the synthesis may range from two to eight.

Exhaust gas from the synthesis block is directed to the combustion of the fuel in the furnace 2.

This method may be implemented using known hardware, eliminating the use of expensive compressors.

1. A method of producing methanol, comprising the selection of the processed hydrocarbon gas, desulfurization, catalytic steam reforming of obtaining the converted gas, waste heat from the Department of water, methanol synthesis, Department of condensed methanol, wherein the selected hydrocarbon gas unstable composition under a pressure of not less than 0.001 MPa, the desulfurization of hydrocarbon gas unstable composition is combined with the stage speed stabilization of pressure with the formation of the vapor-gas mixture, the methanol synthesis spend not less than two consecutive flow stage with decreasing what volume of catalyst at a pressure not less than 1.5 MPa, and the Department of methanol produced between successive steps.

2. The method according to claim 1, characterized in that the step pressure equalization gas is produced using a gas-jet devices.



 

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2 cl, 1 dwg

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