JPS5839899A - Pressure-conveyance method through pipeline for compound liquid containing methanol - Google Patents

Abstract

PURPOSE:To convey methanol by pressure without consumption through a single pipeline by mixing hydrocarbon into the mixed liquid of methanol or other organic compound and separating a part of hydrocarbon by gasification at the re- rise of pressure for using for the fuel to drive a gas turbine. CONSTITUTION:Methanol is produced from a mixed gas mainly composed of hydrogen and carbon oxide. When the mixture of methanol or other organic compound, liquefied at an ordinary temperature, is conveyed by pressure via a pipeline C, aliphatic saturated hydrocarbon with 1-5 carbon atoms contained in a molecule is melted into it under pressure to obtain a compound liquid containing hydrocarbon. Since this hydrocarbon can be easily gasified and separated from the methanol by decompression or heating, gas turbines 45 can be operated by the use of the gas at relay stations P1, P2...Pn in the pipeline C for furthermore re-rising the liquid under pressure-conveyance by the use of a multi- stage centrifugal pump 44.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for pumping methanol or organic liquid substances containing methanol over long distances using pipelines.

In recent years, as humankind's energy consumption has increased, large amounts of energy resources have been transported from the areas where they are extracted to the areas where they are consumed. The main energy resources being transported are petroleum crude oil, hydrocarbon gas, and coal. Recently, methanol has been regarded as important as a product that should be transported in large quantities as an energy source, similar to the above-mentioned energy resources. The reason why methanol has been regarded as an important energy resource to be transported is because it is used among various energy resources such as extracted hydrocarbon gas, petroleum crude oil, heavy oil attached to oil sands, and coal, as well as hydrocarbon gas and ordinary crude oil. It is easy to use pipelines to transport oil by pressure over land to consumption points or shipping ports, whereas in the case of special crude oils, heavy oils attached to oil sands, etc., the melting point is low. Because of its high viscosity, it must be heated while being pumped when it is pumped using a pipeline, and since coal is still a solid, it is not suitable for pumping by pipeline. For energy resources that are not easy to produce, methanol can be produced from these resources for which large-scale production methods have already been established in the areas where these resources are mined.
This is because if this methanol is pumped using a pipeline to a consumption area or a shipping port for shipping, energy resources that are unsuitable for pumping by pipeline can actually be pumped by pipeline.

It is obvious that it is possible to pump methanol through a pipeline because methanol, which is liquid at room temperature, can be pumped through a pipeline by increasing its pressure using a pump and causing it to flow through the pipeline. Unlike the well-known pressure transport method of hydrocarbon gas, the pressure transport method using a pipeline still has the following problems. No. Figure 7 is a conceptual diagram showing the configuration of a normal pipeline, where A is an energy resource mining area, and in carrying out this invention, a methanol manufacturing factory exists in area A, while B is a methanol manufacturing factory. It is a consumption area or a shipping port for shipping vessels. A line C connecting areas A and B indicates a pipeline, and when methanol pressurized at area A is injected into pipeline C, the methanol flows through the pipe toward area B, where the pressure is lower. The pressure during press-fitting is usually jθ~/9θ at /θkg/d or more.
kg/d is used. As methanol flows in the pipe, the pressure of methanol in the pipe gradually decreases.

Therefore, if the distance between area A and area B is less than /jθ~-〇〇〇, it is normally possible to flow methanol to area B just by pressurizing the methanol at area A. When the distance between ground B exceeds 20θKm, relay pump stations P1P2...Pn are installed at approximately /θθ~2θθKm intervals according to the distance between A and B, and methanol with reduced pressure is pumped. Methanol cannot be delivered to location B unless the pressure is raised again using a Each relay pump requires a power source to drive the pump. The first possible source of power for this would be electricity, but this would be impractical as it would require installing a power transmission line in parallel with the pipeline. A second option is to burn the liquid or gaseous fuel supplied by the other seven fuel transport pipes installed parallel to the pipeline at a relay pumping station using, for example, a gas turbine to generate power. However, this method also requires the addition of seven pipelines to transport the fuel, which is not practical. The third option is to burn a portion of the methanol being pumped through a pipeline as fuel for a gas turbine to generate power. This method can be carried out using seven pipelines, which simplifies the pumping equipment, but the methanol produced by consuming part of the energy held by energy resources can be reused to generate power for pipeline pumping. This third method is also not sufficient because it causes a decrease in the amount of energy that can be delivered to area B relative to the energy amount of the energy resources consumed and mined in area A.

This invention improves the third method described above by using only seven pipelines and completely eliminating the consumption of methanol as fuel during pumping at the relay pump station;
This is a method aimed at reducing the amount of hydrocarbon gas to a very small amount, and in short, it is not enough to transport a large amount of hydrocarbon gas to land B, but the hydrocarbon gas that can be used at land A should be pumped. Pressurized methanol is dissolved in the upper pipeline, and at each relay pump station, the amount of this dissolved gas required as fuel for the gas turbine to drive the pump is separated from the methanol, and the separated hydrocarbons are This is a method of obtaining power for driving a pump using a gas turbine that uses gas as fuel. The hydrocarbon gases to be dissolved in methanol include natural gas that can be mined in small quantities in Area A, methane gas released from coal mines during coal mining, and residual gas that cannot be converted to methanol when methanol is produced from hydrogen and carbon oxide. Hydrocarbon gas contained therein, as well as hydrocarbon gas produced from this residual gas by a so-called methanation catalyst or Fischer-Drobcy catalyst, etc. can be used. Further, if desired, hydrocarbons produced by catalytic reaction using a part of methanol as a raw material can also be used.

This invention will be explained below. A number of methods are known for producing gases rich in hydrogen and carbon oxides from the various energy sources mentioned above. Furthermore, when a gas rich in hydrogen and carbon oxide is brought into contact with an appropriate catalyst at 23θ to 3θθ℃ under a gauge pressure of guθ to 3θθkg/- (the same applies below), equations (1) and (2) are obtained. It is also well known that methanol is produced.

2H2+00-) 0H30H (1) JHz +CO2→0H30H+H20 (2) In addition, in these methanol production reactions, ethers such as dimethyl ether, diethyl ether, isopropyl ether, and isobutyl ether, and aldehydes such as acetaldehyde and propionaldehyde are used together with methanol.

Hydrocarbons such as methyl formate, methyl acetate, methyl propionate natonoesters, methane, ethane, furopane, buta/, pentane, hexane, heptane, octane,
Ketones such as acetone, methyl ethyl ketone, methyl isopropyl ketone, diisopropyl ketone, alcohols such as ethanol, tertiary butanol, inbutanol, n-butanol, various amyl alcohols, and many organic compounds such as acetal are by-products (hereinafter referred to as It is also well known that these are simply referred to as by-product organic substances and are usually obtained in an amount of 5% by weight or less relative to methanol. In the production of methanol, the hydrogen content in the gas, which is usually rich in hydrogen and carbon oxides, suppresses the formation of the above-mentioned by-product organic substances (1) and (2).
It is brought into contact with the catalyst in a composition with a slight excess of hydrogen than the molar ratio of hydrogen and carbon oxide shown by the formula. However, the amount of methanol obtained by contacting this gas with the catalyst seven times depends on the temperature and pressure at which the gas and catalyst come into contact due to chemical equilibrium reasons.

It stays within a certain amount determined by. Therefore, once the gas has passed through the catalyst layer and completed seven contacts with the catalyst, it is indirectly cooled or washed with water without being depressurized to remove the methanol, by-product water, etc. contained in this gas. Partial by-product organic matter is condensed or transferred to washing water to separate it from the gas as a liquid (hereinafter, this separated liquid is referred to as crude methanol), and the gas from which these reaction products are separated is brought into contact with the catalyst again in the catalyst layer. Recirculate it.”
An amount of fresh hydrogen and carbon oxide-enriched gas corresponding to the separated reaction products is replenished into the cycle gas. Crude methanol is continuously produced by repeating such circulation. In the circulating gas, newly supplied hydrogen, inert gas contained in the carbon oxide-rich gas, and lower hydrocarbons that are difficult to dissolve in the above-mentioned condensate or cleaning liquid accumulate, and when the accumulated amount becomes large ( In order to inhibit the methanol production reaction according to equations 1) and (2), a part of the circulating gas is extracted to the outside of the circulation path in a state containing inert gas, hydrocarbons, hydrogen, and carbon oxide. This extracted gas is residual gas. Crude methanol usually contains about 3 to 3θ of water. The separated crude methanol is usually subjected to two or three stages of rectification under a desired pressure to remove almost all by-product water and by-product organic matter, and is used as purified itanol for various uses. The above description of methanol production and purification is well known. In such a methanol production method, the amount of by-product organic matter and its composition ratio vary depending on various conditions such as the composition of the raw gas, the type of catalyst, temperature, and pressure. It is possible that the amount of by-product organic matter produced is greater than the amount of organic matter produced.

As described in the above summary, this invention is to deliver methanol from place A to place B using a pipeline, and in order to deliver methanol from place A to place B using a pipeline, hydrocarbon gas to be used as a fuel at a relay pump station in the middle of the pipeline is pre-mixed with methanol at place A. A part of this dissolved hydrocarbon is separated from methanol at a relay pump station, and the separated hydrocarbon gas is used as fuel to generate power using a gas turbine, and this power is used to power the next relay pump. This method drives a methanol repressurization pump that delivers methanol to the desired location. As mentioned above, the use of a pipeline to pump a large amount of methanol means to pump methanol as fuel. Therefore, although the content of the present invention has been described above using an example in which the purified methanol is pumped through a pipeline, the methanol that can be pumped through a pipeline in this invention is not limited to purified methanol. In other words, from the perspective of pumping methanol for fuel using a pipeline, conversely, even if the above-mentioned organic by-products are mixed into methanol, no problem will occur; This produces favorable results because it increases the calorific value of the mixture to be pumped through the line and also increases the solubility of the hydrocarbon gas in the mixture over its solubility in purified methanol. Further, when the mixed liquid is used as a fuel and is pumped through a pipeline, a water content of about 596 ml or less does not pose a serious problem. Furthermore, allowing at least a portion of the organic by-products and some water to be contained in the liquid to be pumped through the pipeline has the effect of reducing the energy required to purify crude methanol. This has the effect of increasing the solubility of hydrocarbon gases, preventing or reducing the use of methanol or mixed liquid as fuel for gas turbines at intermediate pumping stations, and resulting in a large energy saving effect as a whole. Of these two effects, the effect of saving energy in refining crude methanol is normal if, for example, almost no by-product organic matter is removed and the water content in the mixed liquid after purification is θS ~ / Compared to the case of purified methanol, the life expectancy is approximately less than μ.

7 of the solubility of hydrocarbon gases in methanol or mixtures
Examples are shown in the table below.

The above table shows the amount of hydrocarbon gas in the left column dissolved in the liquid/ton in the upper column at 2j℃ under the same pressure as the gas's temperature at 0℃,
/at atmospheric pressure.However, the incorporation of by-product organic matter into methanol increases the solubility of hydrocarbon gases, and the presence of a small amount of water in methanol or the mixture does not significantly reduce the dissolution of hydrocarbons. It shows that it is not allowed. Such a phenomenon occurs in substantially the same way even if the organic substance other than methanol in the liquid mixture is not an organic substance that is a by-product during methanol production, as long as it is an organic substance that dissolves in methanol and forms a liquid mixture at room temperature. Therefore, in this invention, the organic substances to be mixed into the liquid mixture include not only organic substances by-produced during methanol production, but also other organic substances that can be used as long as they dissolve in methanol at room temperature and form a liquid mixture. It is possible. These usable organic substances also include hydrocarbons of pentane or higher, which are liquid at room temperature.

This invention utilizes the dissolution phenomenon of hydrocarbon gas in methanol or a mixed liquid of methanol and at least seven types of organic substances other than methanol (hereinafter both are simply referred to as methanol-containing liquid) to be pumped through the pipeline as described above. When pressurizing the methanol-containing liquid at site A and injecting it into the pipeline in order to pump the methanol-containing liquid through the pipeline, the pressurized methanol-containing liquid at the desired pressure before injection is brought into contact with the hydrocarbon-containing gas at approximately the same pressure, Hydrocarbons are dissolved in a methanol-containing liquid to form a hydrocarbon-containing composition liquid (hereinafter simply referred to as composition liquid).If necessary, it is further pressurized and compressed into a pipeline, and at a relay pump station, the composition is sent from upstream. A portion of the liquid is depressurized and/or heated to separate a desired amount of dissolved hydrocarbon gas as a gas from the liquid, and this separated gas is used as fuel to drive a gas turbine to drive a pump, which pumps out the remainder. This is a method in which the liquid after separating the composition liquid and the fuel hydrocarbon gas is pressurized again and continues to be pumped downstream. As the pump, a multi-stage centrifugal pump is suitable since it is necessary to pressurize a large amount of liquid to the above-mentioned high pressure, and a well-known multi-stage centrifugal pump can be used.

The amount of fuel consumed to drive the gas turbine at a relay pump station varies depending on the performance of the gas turbine and pump, the flow rate and temperature of the methanol-containing liquid or composition liquid in the pipeline, but under normal conditions at room temperature, these liquids / For pumping ton/θθθKm, combustion heat of θθθθ~/SθθθθKcal is required. If the dissolved hydrocarbon gas is methane, this combustion heat is approximately 7 to 73 m3 as the gas volume in the standard state.
s Ethane is about 39 to 9 tons, propane is about 2.7 to 69, and phethane is 2θ to 3 tons.
T? amount of fuel. Therefore, for example, if methane is dissolved in purified methanol to saturation under 2S pressure in area A, as is clear from the above table (the fuel at the relay pump station for pipeline pressure transfer of 25θθKm or more can be filled only with this dissolved methane). In normal pipeline pressure feeding, at site A or a relay pump station, purified methanol is pressurized to 50 kg/- to /9θkg/J and injected into the pipeline as described above, so methane is saturated at this pressure. In the case of dissolution, the above-mentioned pumping distance is further extended.On the other hand, if there is no need to extend the pumping distance, there is no need to dissolve to saturation.Also, when methane is added to a methanol-containing liquid containing other organic liquids than methanol, it is not necessary to extend the pumping distance. It is clear from the above table that the same effect will be even greater if a hydrocarbon gas such as ethane, propane, or phrine is dissolved. The pressure of the composition being pumped in the line decreases due to flow, and when that pressure drops below the equilibrium pressure of the composition liquid, the gas dissolved in the pipeline separates as a gas phase, and the liquid in the pipeline This may cause problems with the flow. To prevent such problems, it is necessary to maintain the pressure inside the pipeline higher than the equilibrium pressure of the dissolved hydrocarbon gas. Hydrocarbon gases used in the invention are hydrocarbon gases with a large number of carbon atoms, such as butane or pentane, which dissolve in a large amount even if the equilibrium pressure is small and have a large heat of combustion, such as butane or pentane, in the case of methane. It is harmonically advantageous in comparison.

Gasification and separation of the hydrocarbon gas dissolved therein from the composition at the relay pumping station is easily carried out by reducing the pressure of the composition, or by heating it, or by using a combination of both. As the heat source for heating in this case, it is most appropriate to use the combustion exhaust gas of the separated hydrocarbons, which is discharged at a considerably high temperature after being combusted in a gas turbine. The gasified and separated hydrocarbon gas is used as fuel for a gas turbine, but in order to fully demonstrate the functions of the gas turbine, it must be at least /θkg/ffl, usually 2θ to Sθ.
A fuel pressure of kg/- is required. Therefore, when separating the hydrocarbon gas to be used as fuel at this relay pump station from the composition liquid that has flown in the pipeline and whose pressure has decreased to a relay pump station from upstream, it is necessary to separate the separated composition whose pressure has decreased. Although it is possible to directly reduce the pressure or heat a part of the liquid to separate the dissolved hydrocarbons, it is also possible to directly pressurize or heat a part of the liquid to separate the dissolved hydrocarbons. By decompressing or heating it, the hydrocarbon gas with the pressure required as fuel is separated, and the remaining liquid after separating the hydrocarbon gas is sucked into the booster pump again, pressurized, and then pressurized into the pipeline. In many cases, it is more advantageous to use a method in which the pumped water is pumped downstream because the equipment at the relay pump station is simpler. In other words, if the former method is used instead of the latter method, a compression equipment for the small amount of separated fuel hydrocarbon gas and a booster pump for the small amount of residual liquid after separating the fuel hydrocarbon gas are separately required. This is because.

This invention will be described in more detail below using examples. Figure 1 shows seven examples of the process from producing crude methanol to purifying it and pressurizing it into a pipeline. / is a reactor for producing crude methanol, with a catalyst inside.
has.

The high-pressure hydrogen and carbon oxide-enriched gas supplied through tube 3 contacts the catalyst in this reactor at a temperature suitable for the catalyst;
Some hydrogen and carbon oxides are converted to methanol or by-product organics. The high-temperature gas that underwent the conversion reaction is introduced into the cooler S through the pipe 6, where it is indirectly cooled by the coolant that enters from the pipe 6-/ and exits from the pipe 2-2, and methanol and most of the by-product organic matter are removed. is condensed. The condensate and unreacted gas are introduced into a separator via pipe 7 and separated into unreacted gas and condensate. The unreacted gas passes through the pipe and is pressurized by the circulation compressor /θ, passes through the pipe and joins with the newly supplied high-pressure gas supplied from the pipe 3, and then enters the reactor again and undergoes a conversion reaction. By repeatedly circulating the unreacted gas in this way, dimetatools are continuously produced. On the other hand, the condensate separated from the unreacted gas in the separator zone is crude methanol and is supplied to the supply stage of the first rectification column/3 via the upper pipe 7.2 under reduced pressure to a desired degree. In the first rectification column, main heating is performed at the bottom of the column (omitted in Figure 2) using a well-known method, and a rectification action is performed at the top of the column using a large number of rectification shelves or packings installed in the column. A by-product organic vapor having a lower boiling point than methanol is obtained through the pipe/S.

This vapor is indirectly cooled in the cooler /6 by the coolant supplied from the pipe /7-/ and discharged from the pipe /7-2, and is condensed and liquefied. A portion of the liquid is returned to the top of the rectification column as a reflux liquid, and the remainder is sent to the tank 2j via pipe 3/. In addition, a liquid containing methanol, water, and other by-product organic substances is obtained from the bottom of the first rectification column, and this liquid is passed through the pump/cob tube/tube to the λ rectification column and the 2δ supply stage. supplied to In the first rectification column, in order to prevent a large amount of methanol from distilling out into tube / Water containing a small amount of alkali such as caustic soda (which may also contain a small amount of methanol) may be supplied from pipe /41 to a stage above the crude methanol supply stage for both purposes of preventing corrosion. In the second rectification column, highly pure methanol vapor is obtained via the pipe 2/ at the top of the column by a rectification action similar to that in the first rectification column, and this vapor is sent to the cooler 2.
It is indirectly cooled by the coolant introduced into the pipe 23-/ and discharged from the pipe 23-2, and is condensed and liquefied. A part of the liquefied purified methanol is returned to the top of the second rectification column as a reflux liquid, and the remainder is sent to a tank, 2K, via a pipe, 2G. A liquid containing a very small amount of methanol and by-product organic matter is extracted from the bottom of the column No. 1 through a pipe 3θ, and is either used for a desired purpose or discarded.

In addition, most of the by-product organic matter with a higher boiling point than methanol is extracted as a water-containing side stream liquid from the intermediate stage between the lowest rectifying stage and the feed stage of the No. 2 rectifying column via pipe 2 O. At 27, it is supplied from the pipe 2-7 and is indirectly cooled by the coolant discharged from the pipe 2g-1, and then sent to the tank 2S by the pump 2. - The liquid stored in the tank 2S is a liquid containing methanol, most of by-product organic matter, and a small amount of water, that is, the above-mentioned methanol-containing liquid.

On the other hand, the circulating gas that has been circulated by the circulation compressor/θ and repeatedly contacted the catalyst is cooled by the cooler S, which includes the inert gas contained in the newly supplied gas and the by-product organic matter generated as a result of contact with the catalyst. Gases that are not condensed or dissolved in the crude methanol accumulate and interfere with the progress of the conversion reaction in the reactor, so a portion of the circulating gas is withdrawn from the tube as residual gas.

In a manner known from the prior art, this residual gas is used as fuel for the production of a new feed gas which is supplied via line 3.

This residual gas usually contains more than COS hydrogen, 3-20% or more carbon oxide, and the hydrocarbon content is at most about -0-, but at a pressure of IIto~3θθ-/cfA and at about room temperature or lower. It has a temperature. Therefore, this residual gas is mixed with the pressurized mixed liquid by the pump 39-/ and the gas-liquid contact device 33.
It is possible to make a composition liquid containing hydrocarbons by contacting them under high pressure, but in this case, it is difficult to dissolve a large amount of hydrocarbons into the mixed liquid because the partial pressure of the hydrocarbons is low. More effectively, the residual gas extracted at the tube is heated to a reactor 33 containing a methanation catalyst or a Fischer-Tropsch catalyst 36 under approximately the same pressure as the methanol production pressure.
The catalysts are introduced into the tube 3g-/ to carry out the methanation reaction or the Fischertronopsia hydrocarbon synthesis reaction at an appropriate temperature, and the catalysts are introduced into the cooler 37 through the tube 3g-/.
- After being cooled by the coolant discharged from the gas-liquid contact device 33, a large amount of hydrocarbons can be dissolved in the dimethatol-containing liquid by contacting it with the methanol-containing liquid sent from the high-pressure pump 39-/. . That is, when a methanation reaction catalyst is used as a catalyst in the reactor 3S, the following reaction (8) occurs in the residual gas.

JH! +00→OH4+ auto (8) The remaining gas after the reaction is cooled by a cooler 37 to condense water, and after separating this condensed water in a separator lIo, it is passed through a pipe 3.2 to a high-pressure pump 3? in a gas-liquid contact device. -/If the gas is brought into contact with a methanol-containing liquid fed into this device, the concentration of hydrocarbons in the gas has increased significantly, so that the hydrocarbons can be effectively dissolved in the methanol-containing liquid. . The composition liquid containing dissolved hydrocarbons is pumped with 3 high pressure pumps as necessary.
The gas is then pressurized into the gas line 11.2 after the pressure is increased again. If the catalyst 36 is a Fischer-Tropsch catalyst, the following reaction (a) occurs in the remaining gas.

(!n+/)Hs+nC0-+0nHzn10m+nHa
O(4) In this reaction, various hydrocarbons are produced, where n is 7 to 3θ, and some of these hydrocarbons are gaseous, liquid, or solid depending on the room temperature. However, after the gas after the reaction is cooled to approximately room temperature by the cooler 37, a water phase, a hydrocarbon liquid phase and a gas phase in which some hydrocarbons are gaseous at room temperature and some hydrocarbons are solid at room temperature are dissolved. becomes. Therefore, if only the aqueous phase is removed in the separator qθ and the gas phase and hydrocarbon liquid phase are introduced into the gas-liquid contact device, the liquid phase hydrocarbons and the gas phase hydrocarbons will be dissolved in the methanol-containing liquid and the composition liquid will be dissolved. Become. The subsequent method of pressurizing the composition liquid into the drain line is the same as described above.

The hydrocarbon-containing gas to be brought into contact with the mixed liquid in the gas-liquid contact device is not limited to the above example, and any type can be used as long as the above hydrocarbons are available. Further, the pressure at which the hydrocarbon is dissolved in the mixed liquid in the gas-liquid contact device is preferably equal to or lower than the pressure at which the composition is forced into the pipeline. The reason for this is to eliminate the need to increase the pressure of the methanol-containing liquid to a pressure higher than that required for pressurizing the methanol-containing liquid into the injection line, and to prevent unnecessary consumption of energy. Therefore, when the methanol synthesis pressure is higher than the injection line inlet pressure, (If the gas-liquid contact is made at the same pressure as the pipeline inlet pressure, the high-pressure pump 39-2 can be omitted.On the other hand, if the methanol synthesis pressure is lower than the pipeline inlet pressure, the methanol synthesis pressure is approximately the same as the methanol synthesis pressure.) It is preferable that the resulting composition liquid be brought into gas-liquid contact and then pressurized again to the injection pressure into the pipeline using the high-pressure pump 3 ter 2 and then pressurized.

Further, the temperature during gas-liquid contact is most preferably close to room temperature.

Since the reactions according to equations (8) and (4) above are both intense exothermic reactions, there is no special energy consumption by performing these reactions, and the heat of reaction can be recovered by a well-known method. On the contrary, overall energy consumption can be reduced.

Figure 3 shows that at a relay pump station, the hydrocarbon gas dissolved in the liquid that arrives from the upstream of the oil line is gasified and separated, and the separated gas is sent to a gas turbine that uses it as fuel to boost the pressure again. This is an embodiment example for driving a multi-stage centrifugal pump to pump a composition to the downstream side of a pipeline, and uses a combination of depressurization and heating of the composition liquid as a method for separating hydrocarbon gas. .G2 in Figure 3
is a pipeline in which a composition is sent from upstream (A side) and is subsequently sent to the downstream side (B side) divided by a stop valve 1It3 for repressurization. Further, && is a multi-stage centrifugal pump for repressurizing the composition liquid, and this multi-stage centrifugal pump is driven by a gas turbine/IS. The gas turbine IIj has one rotating shaft II and one rotary shaft. The rotating shaft of the pump '19 is connected to the rotating shaft of the generator/motor Sθ. First, we will explain the operating procedures of this relay pump station during normal operation. During normal operation, valve 3 is closed, and the composition that has arrived at this relay pump station via pipeline from the downstream side is sucked into the multistage centrifugal pump from pipe S/lt, and the pressure is increased to the desired pressure. It is then press-fitted again into the downstream side of the valve 3 via the pipe 5.2. The suction pressure varies depending on the type of dissolved hydrocarbon gas, but
usually/~! ; Okg/-, and the pressure for re-injection is usually jθ
~/riθkg/-. A part of the pressurized liquid composition is extracted from the intermediate stage of the multistage centrifugal pump 9& at the desired pressure through the pipe S3 and introduced into the main heater 5q where the pressure is reduced to the pressure required for fuel for the gas turbine or a pressure higher than this pressure. In the heater the composition is piped! ; is indirectly heated by a portion of the hot combustion exhaust gas of the gas turbine passing through. Since the hydrocarbon gas dissolved in the composition liquid is gasified by the above-described pressure reduction and heating, this mixed phase of gas and liquid is introduced into the separator St and separated into gas and liquid. Gas is supplied to the combustion chamber sg of the gas turbine via a pipe S7, taken in through an air intake port 60, compressed to combustion pressure by an air compressor (usually using a multi-stage centrifugal compressor), and then passed through a pipe 59. The compressed air is mixed with the compressed air supplied to the combustion chamber sg for combustion.

The high-temperature, high-pressure combustion gas generated by this combustion passes between the impellers of the rotating gas turbine while transmitting its retained energy to the impellers, expands and depressurizes, passes through the pipe jj, and a portion of the gas passes through the heater. After heating the composition at 3'l, it is released into the atmosphere.

On the other hand, the mixed liquid separated in separator j6 and having lost most of the dissolved hydrocarbons is sucked into a multistage centrifugal pump + stage with the desired pressure of <z, and is piped together with other liquid components from pipe 3.2. − is press-fitted downstream. Inside the multi-stage centrifugal pump &Q, the composition liquid with low hydrocarbons taken in from the high temperature pipe 6/ and the composition liquid taken in from the pipe S/ are mixed, but the hydrocarbon content taken in from the pipe 6/ is mixed. The small amount of the liquid composition does not cause any trouble because it is only a small part of the liquid composition sucked from the pipe S/.

The maximum temperature for heating the composition liquid in the heater s4t is desirably a temperature that is lower than the boiling temperature of the composition liquid after releasing the hydrocarbons at the source side pressure of the heater by about /θ°C or more. This is because when this final temperature approaches the boiling temperature of the methanol-containing liquid under that pressure, methanol or by-product organic matter becomes vapor and is consumed as fuel. In addition, if the pressure in the combustion chamber of the gas turbine is lower than the pressure inside the pipe j/, the fuel hydrocarbons separated in separator S6 are depressurized and then returned to the combustion chamber! ; It can be operated in almost the same way by supplying the same. During normal operation, the generator/electric motor jθ functions as a generator and charges the generated power to the secondary battery 6.2, and when the gas turbine is started, it rotates as an electric motor with the power from the secondary battery Otsu 2 and generates air. This is for supplying the necessary starting compressed air to the combustion chamber sg by the compressor lid.

This invention has many embodiments other than those described using FIGS. 2 and 3, such as a method for producing a composition at site A or a method for separating hydrocarbon gas from a composition at a relay pump station. However, the gist of this invention is methanol or a mixture of methanol and at least seven types of organic compounds other than methanol, and a hydrocarbon gas is dissolved under pressure in a mixture liquid at room temperature at location A to produce a hydrocarbon-containing mixture. A carbonization process in which the composition is pumped through a pipeline, the hydrocarbon gas is extracted at a relay pump station and used as fuel for a gas turbine, and a multistage centrifugal pump is driven to repressurize the liquid to be pumped by the gas turbine. Since hydrogen has a boiling point that is approximately the same as or higher than that of methanol or a mixture of at least seven organic compounds, this type of hydrocarbon is mixed with methanol or a mixture at a relay pump station. It is not practical because the method of separating it from the For this reason, the preferred hydrocarbon gases as fuels in the relay pumping station of the present invention are those having 7 to 5 carbon atoms per molecule. Furthermore, any of the many hydrocarbons having 7 to 5 carbon atoms in the molecule can be used alone or in combination. /Among hydrocarbons having 7 to 5 carbon atoms in the molecule, some of them other than aliphatic saturated hydrocarbons, such as ethylene, propylene, and butylene, can be used, but are not practical. However, hydrocarbons having six or more carbon atoms in the molecule are not practical as fuel for gas turbines at Nyoshi relay pumping stations for the reasons mentioned above; There is no problem with its existence.

As already mentioned, the main effects of this invention are that methanol or a mixed liquid containing methanol and hydrocarbon gas used as fuel at the relay pump station can be simultaneously transported through seven pipelines, and methanol or It is possible to eliminate the use of a mixed liquid containing methanol as fuel, or to use only a small amount of it, and as a side effect, it saves energy for crude methanol purification by using by-product organic matter during methanol production. However, the main effect is enhanced by simultaneously increasing the amount of hydrocarbon gas that can be transported.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram showing the basic configuration of a pipeline, Fig. 1 shows an embodiment of the present invention at the starting point of the pipeline, and Fig. 3 shows an embodiment of the present invention at a relay pumping station in the middle of the pipeline. This is an example of implementation. A Energy resource extraction area (location of methanol manufacturing plant) B Energy resource consumption area or shipping port C Pipeline P,, P,...Pn Relay pump station/Reactor 2 Catalyst 3 New high pressure gas supply pipe J Cooling vessel 4-/, 6-J7 pipe and separator, 9-/ pipe/θ circulation pressure/compressor //, -7,2 pipe/3 1st rectification column/g, /S pipe/6 cooler /7-7, /7--pipe/pipe Pump/9 pipes θ Rectifier column 2/pipe, 22 Cooler co3-/, 2J-, 2,, 2-pipe 2j Tank-6 pipes -7 Cooler, 2 grooves/, -g-co-pipe, 29 Pump 3θ, 37.32 tube 33 Gas-liquid contactor 3-da tube 3S Reactor 36 Catalyst 37 Cooling - 3-groove/, 3g-co-pipe 39 -7.39-1 High-pressure pump/pipe gluco Pipelining 3 valves 4tQ Multi-stage centrifugal pump 4tj Gas starping 6, guar Rotating shaft qg Air compressor geta Lubricating oil pump jθ Generator and electric motor j/, 32, 3; 3 pipes J da Heater jj pipe j6 Gas-liquid separator j7 pipe 3g Combustion chamber Sta pipe 6θ Air intake port 6/tube 6.2 Secondary battery procedure amendment (voluntary) 1988 8
May 26, 2015 Commissioner of the Japan Patent Office 1. Indication of the case 1981 Tokuken Application No. 137757 2. Name of the invention Pipeline pressure conveyance method for methanol-containing composition liquid 3. Relationship with the amended person's case Name of patent applicant Representative Person: Masao Yokoi 4, Agent 5, No date of amendment order (voluntary amendment) Provide a detailed explanation of the invention in the specification. (2) Page 17 of the specification, line 6'r2500Kn+j
Correct it to rloooKm l. 8. No list of attached documents

Claims (2)

[Claims] (1) Methanol is produced from a mixed gas containing hydrogen and carbon oxide as main components, and the resulting methanol or a mixture of methanol and at least seven organic compounds other than methanol, which is liquid at room temperature, is piped. In the method of long-distance pumping by a line, an aliphatic saturated hydrocarbon having 7 to 5 carbon atoms in 7 molecules is dissolved in advance in the methanol or the mixed liquid under pressure to prepare a composition liquid containing the hydrocarbon, This composition liquid is pressurized into a pipeline, and when the pressure of the liquid being pumped is increased, which is necessary in the middle of the pipeline, a part of the composition liquid is depressurized and/or heated to dissolve and separate the hydrocarbons by gasification. ,
By using a pipeline of methanol, the mixed liquid, or the composition liquid, which is characterized by repressurizing the liquid being pumped using a multi-stage centrifugal pump driven by a gas turbine that uses this separated hydrocarbon as fuel. Pumping method. (2) Hydrocarbons dissolved under pressure in methanol or the mixed liquid in the method described in claim 1 are contained in the residual gas that was not converted to methanol during the production of methanol, or this residual gas 2. The method according to claim 1, wherein the method is produced by contacting a desired catalyst with the catalyst under appropriate temperature and pressure.