CN113388426B - Dewaxing agent and natural gas dewaxing treatment method - Google Patents
Dewaxing agent and natural gas dewaxing treatment method Download PDFInfo
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- CN113388426B CN113388426B CN202010171546.9A CN202010171546A CN113388426B CN 113388426 B CN113388426 B CN 113388426B CN 202010171546 A CN202010171546 A CN 202010171546A CN 113388426 B CN113388426 B CN 113388426B
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
Abstract
The invention relates to a dewaxing agent and a natural gas dewaxing treatment method. Belongs to the technical field of natural gas treatment, and the dewaxing agent bagComprises the following components in percentage by weight: 0.1 to 20 percent of polyisobutylene, 0.1 to 30 percent of glycol, 0.5 to 10 percent of surfactant and 40 to 99 percent of alkane; wherein the alkane is C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of cycloalkanes of (a). The application can have good solubility to solid wax; the boiling point of the dewaxing agent is improved, and the freezing point of the dewaxing agent is reduced; increasing the surface tension of the dewaxing agent to form a synergistic effect among the components in the dewaxing agent; the surfactant is matched, so that all components in the dewaxing agent form a uniform system, the dissolution of the solid wax is further promoted, the viscosity of a liquid system is reduced, the adhesive force of the solid wax on a metal wall surface is reduced, the deposition of the solid wax is reduced, and the solid wax is easy to remove.
Description
Technical Field
The invention relates to the technical field of natural gas treatment, and particularly relates to a dewaxing agent and a natural gas dewaxing treatment method.
Background
With global attention to air pollution, natural gas has gradually become one of the main energy sources in the industrial and civil fields as a clean energy source, and the huge market demand brings about the mass development of global natural gas resources. Before the produced natural gas becomes a commercial energy source, the produced natural gas needs to be subjected to a series of processing treatments to remove water, heavy hydrocarbons and toxic substances in the produced natural gasHarmful to the impurities. The existing heavy hydrocarbon removal treatment process is mainly based on a low-temperature mode, and the process principle is mainly that low-temperature separation is carried out after the temperature of each component in natural gas is reduced by a refrigerating device by utilizing the difference of dew point temperatures of the components in the natural gas. However, due to the change of pressure and temperature, part of the high carbon number hydrocarbons will precipitate and form solid wax, the component of which is mainly C 17 ～C 35 The straight-chain alkane of (2) also contains a small amount of branched alkane and monocyclic cycloalkane with long side chain, and the straight-chain alkane is mainly n-docosane and n-octacosane. The solid wax is deposited in a pipeline or equipment, so that the equipment is blocked, the heat exchange efficiency is reduced, and the natural gas treatment device cannot normally operate.
In the related art, solid wax blocking a pipeline or equipment is melted by heating and carried away by natural gas.
The inventors found that the related art has at least the following technical problems:
the wax blockage is removed in a heating mode, a hydrocarbon removal process device needs to be stopped, high-carbon hydrocarbon can enter a natural gas phase again, and after the temperature is reduced, the high-carbon hydrocarbon can be separated out again in the subsequent treatment and transportation processes.
Disclosure of Invention
The embodiment of the invention provides a dewaxing agent and a natural gas dewaxing treatment method. The technical problems that wax blockage is removed in a heating mode, a hydrocarbon removal process device needs to be stopped, high-carbon hydrocarbon enters a natural gas phase again, and after the temperature is reduced, the high-carbon hydrocarbon is separated out again in the subsequent treatment and transportation process can be solved.
The specific technical scheme is as follows:
in one aspect, a dewaxing agent is provided, and the dewaxing agent comprises the following components in percentage by weight:
0.1 to 20 percent of polyisobutylene, 0.1 to 30 percent of glycol, 0.5 to 10 percent of surfactant and 40 to 99 percent of alkane;
wherein the alkane is C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of cycloalkanes of (a).
In one realizable approach, the dewaxing agent includes the following components in weight percent:
4 to 10 percent of polyisobutylene, 0.5 to 5 percent of glycol, 0.5 to 5 percent of surfactant and 85 to 95 percent of alkane;
wherein the alkane is C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of cycloalkanes of (a).
In an implementable manner, said C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of the cycloalkanes of (a) has a boiling point of greater than 80 ℃.
In an implementable manner, said C 5 ～C 35 Straight chain alkane and C 5 ～C 35 The freezing point of at least one of the cycloalkanes of (a) is less than-20 ℃.
In an implementable manner, said C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of the cycloalkanes of (a) has a pour point of less than-20 ℃.
In one realizable approach, the surfactant is a nonionic surfactant and/or a silicone surfactant.
In one achievable form, the nonionic surfactant is a polyoxyethylene ether surfactant.
In one achievable form, the polyoxyethylene ether surfactant is an alkylphenol ethoxylate.
In one achievable form, the polyisobutylene has a molecular weight of from 500 to 1000.
In another aspect, there is provided a method for dewaxing a natural gas by using any of the dewaxing agents described above, the method comprising:
the method comprises the following steps that raw material natural gas and a dewaxing agent enter a raw material gas precooler through a pipeline atomizer, then enter a gas-liquid separator and a raw material gas aftercooler in sequence, enter a low-temperature separator for low-temperature separation after being cooled by the raw material gas aftercooler, and are added into an inlet of the raw material gas aftercooler until the liquid level of the low-temperature separator reaches a normal working liquid level;
the natural gas separated by the low-temperature separator enters the feed gas aftercooler through a gas phase outlet at the top, enters the feed gas precooler through an outlet at the upper part of the feed gas aftercooler, and then enters an output device through an outlet at the upper part of the feed gas precooler to become product natural gas;
and the low-temperature dewaxing agent separated by the low-temperature separator enters an injection pump through a liquid phase outlet at the bottom of the low-temperature separator, and then is injected into a raw material gas precooler through the pipeline atomizer through an inlet of the raw material gas precooler, and the dewaxing agent is accompanied with the raw material natural gas to complete dewaxing in the natural gas treatment process.
Compared with the prior art, the technical scheme of the invention has the following advantages:
based on C 5 ～C 35 Straight chain alkane and C 5 ～C 35 The lipophilicity of the cycloalkane can be good for the solubility of the solid wax; the boiling point of the dewaxing agent is increased and the freezing point of the dewaxing agent is reduced by adding polyisobutylene; the surface tension of the dewaxing agent is increased by adding a solvent, so that a synergistic effect is formed among the components in the dewaxing agent; the surfactant is matched, so that all components in the dewaxing agent form a uniform system, the dissolution of the solid wax is further promoted, the viscosity of a liquid system is reduced, the adhesive force of the solid wax on a metal wall surface is reduced, the deposition of the solid wax is reduced, and the solid wax is easy to remove.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a natural gas system when a natural gas dewaxing processing method provided by an embodiment of the present invention is used for processing.
1-atomizer, 2-raw material gas precooler, 3-gas-liquid separator, 4-raw material gas aftercooler, 5-refrigerator and 6-low temperature separator.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
With global attention to air pollution, natural gas has gradually become one of the main energy sources in the industrial and civil fields as a clean energy source, and the huge market demand brings about the mass development of global natural gas resources. Before becoming a commercial energy source, the produced natural gas also needs to be subjected to a series of processing treatments to remove water, heavy hydrocarbons and toxic and harmful impurities. The existing heavy hydrocarbon removal treatment process is mainly based on a low-temperature mode, and the process principle is mainly that low-temperature separation is carried out after the temperature of each component in natural gas is reduced by a refrigerating device by utilizing the difference of dew point temperatures of the components in the natural gas. However, due to the change of pressure and temperature, part of the high carbon number hydrocarbons will precipitate and form solid wax, the component of which is mainly C 17 ～C 35 The straight-chain alkane of (2) also contains a small amount of branched alkane and monocyclic cycloalkane with long side chain, and the straight-chain alkane is mainly n-docosane and n-octacosane. These solid waxes can deposit in pipelines or equipment, resulting in equipment blockage, reduced heat exchange efficiency, and failure of the natural gas processing plant to operate properly.
In the treatment process of natural gas, some liquids such as water and glycol with antifreezing effect exist, but the water and the glycol belong to hydrophilic liquids, and the solid wax belongs to oily substances, and the carrying effect of the water and the glycol on the wax is not obvious due to different properties, so that the dewaxing agent is needed to be provided for efficiently removing the solid wax deposited on pipelines and equipment.
In one aspect, an embodiment of the present application provides a dewaxing agent, which includes the following components in percentage by weight:
0.1 to 20 percent of polyisobutylene, 0.1 to 30 percent of glycol, 0.5 to 10 percent of surfactant and 40 to 99 percent of alkane;
wherein the alkane is C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of cycloalkanes of (a).
The dewaxing agent provided by the embodiment of the application has the following beneficial effects:
based on C 5 ～C 35 Straight chain alkane and C 5 ～C 35 The lipophilicity of the cycloalkane can be good for the solubility of the solid wax; the boiling point of the dewaxing agent is increased and the freezing point of the dewaxing agent is reduced by adding polyisobutylene; the surface tension of the dewaxing agent is increased by adding ethylene glycol, so that a synergistic effect is formed among the components in the dewaxing agent; the surfactant is matched, so that all components in the dewaxing agent form a uniform system, the dissolution of the solid wax is further promoted, the viscosity of a liquid system is reduced, the adhesive force of the solid wax on a metal wall surface is reduced, the deposition of the solid wax is reduced, and the solid wax is easy to remove.
The dewaxing agent provided by the embodiment of the application overcomes the problem of contradiction between the boiling point and the freezing point, not only ensures higher boiling point, but also has lower freezing point, and the dewaxing agent not only can effectively remove solid wax formed in the natural gas dewaxing process, but also can adapt to the conventional natural gas low-temperature separation process, promotes the separation of high-carbon alkane in a gas phase in the low-temperature separation process, and improves the low-temperature separation efficiency.
The dewaxing agents provided herein are explained and described in detail below by way of optional examples.
In an alternative embodiment, the dewaxing agent provided in the examples of the present application includes the following components in percentage by weight: 4 to 10 percent of polyisobutylene, 0.5 to 5 percent of glycol, 0.5 to 5 percent of surfactant and 85 to 95 percent of alkane;
wherein the alkane is C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of cycloalkanes of (a).
As an example, the dewaxing agent provided by the embodiment of the application can comprise 40-99% of C 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 Cycloalkanes of (2), exemplary, C 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The weight percentage of cycloalkanes of (a) may be 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99%, etc.
It should be noted that the dewaxing agent provided in the embodiments of the present application may include only C 5 ～C 35 Straight-chain alkanes, which may also include only C 5 ～C 35 Can also be C 5 ～C 35 Straight chain alkane and C 5 ～C 35 A mixture of cycloalkanes.
As an example, C 5 ～C 35 Straight chain alkane and C 5 ～C 35 The mixture of naphthenes of (a) may be a condensate. The condensate oil can also be white oil or naphthenic oil. White oil is obtained from a mixture of refined liquid hydrocarbons obtained from petroleum, mainly a mixture of saturated naphthenic and paraffinic hydrocarbons, and from crude oil which has been subjected to atmospheric and reduced pressure fractionation, solvent extraction and dewaxing, hydrorefining. Naphthenic oil is extracted from naphthenic crude oil, and the acid value of the naphthenic oil is provided by the example<0.15mgKOH/g, a flow point of-40 to-12 ℃, 87.55 to 93.86 percent of saturated hydrocarbon content, 6.14 to 11.96 percent of aromatic hydrocarbon content and 0 to 0.49 percent of asphaltene content. By selecting the above-mentioned C 5 ～C 35 Straight chain alkane and C 5 ～C 35 The mixture of the cycloalkanes is based on the similar compatibility principle, and the physicochemical property of the mixture is similar to that of the wax, so that the wax can be dissolved well, and the solidification of the solid wax in a natural gas pipeline or equipment is reduced.
As an example, the dewaxing agent provided in the embodiments of the present application may also include only C 5 ～C 35 Straight chain alkane and C 5 ～C 35 When only one of the cycloalkanes is contained, n-hexane, cyclohexane, n-heptane, cycloalkane may be selectedWhen the base white oil and the No. 120 solvent oil are a mixture, the mixture can also be selected from at least one of n-hexane, cyclohexane, n-heptane, naphthenic white oil and No. 120 solvent oil.
Embodiments of the present disclosure also include 0.1% to 20% polyisobutylene, which may be, for example, 0.1%, 0.5%, 1%, 1.5%, 2, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc. by weight.
Polyisobutylene (PIB) is a polymer obtained by polymerizing isobutylene, and may have a molecular weight of several hundred to several million. Polyisobutylene is a typical liquid saturated linear polymer, the molecular chain main body does not contain double bonds, no long-chain branch exists, the structural unit is- (CH2-C (CH3)2) -, asymmetric carbon atoms are not contained in the molecular chain main body, and the structural units are connected in a head-to-tail regular sequence.
It should be noted that, according to the similar compatibility principle, the dewaxing agent provided in the embodiment of the present application can better achieve the wax dissolution effect by matching the component properties and molecular weights of the dewaxing agent and the wax, and therefore, the molecular weight of the polyisobutylene cannot be too large, which may cause too large difference between the molecular weight of the dewaxing agent and the molecular weight of the wax, so that the dewaxing agent cannot be well dissolved with the wax; the molecular weight of the polyisobutene cannot be too low, and too low results in too large a difference between the molecular weight of the dewaxing agent and the molecular weight of the wax, and the polyisobutene cannot be dissolved well with the wax. Therefore, the molecular weight of the polyisobutylene selected in the embodiment of the application is 500-1000. By way of example, may be 500, 550, 600, 650, 700, 750, 800, 850, 900, 1000, etc. By limiting the molecular weight of the polyisobutene to the above-mentioned range, it is possible to react with C 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The composite material is well compounded with the naphthenic hydrocarbon and the glycol, and based on the principle of similar compatibility, the polyisobutylene with the molecular weight in the range is similar to the molecular weight and physical properties of the wax, so that the polyisobutylene can be well dissolved in the wax, the solubility of the polyisobutylene in the wax is improved, and the wax is prevented from forming a solid and being attached to a pipeline or equipment. On the other hand, dewaxing can be improvedThe boiling point of the agent, and does not raise the freezing point of the wax, and stabilizes the viscosity of the composition.
It should be noted that the polyisobutylene provided in the related art is only used to improve the viscosity index, and the polyisobutylene provided in the examples of the present application may have an inhibitory effect on the pour point of the wax.
As an example, polyisobutylene with a product code of H-50 in Enlis, polyisobutylene with a product code of H-100, etc. may be selected according to the molecular weight of polyisobutylene.
The dewaxing agent provided in the embodiments of the present application further includes 0.1% to 30% of ethylene glycol, for example, the weight percentage of ethylene glycol may be 0.1%, 0.5%, 1%, 1.5%, 2, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, etc.
The ethylene glycol can reduce the formation of hydrates and prevent wax freezing blockage, and the ethylene glycol is an antifreeze in a low-temperature separation process, and has a high boiling point and a low freezing point, so that wax solidification can be further avoided after the wax is dissolved.
The dewaxing agent provided by the embodiment of the application also comprises 0.5-10% of surfactant. The components can form a uniform system through the surfactant, the surfactant can reduce the adhesive force between the solid wax and the metal wall surface, so that the solid wax can be removed under the fluid driving force of natural gas even if the dewaxing agent does not completely dissolve the solid wax, the adhesive force of the solid wax is reduced, and finally the surfactant can remove C 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The cycloparaffins and other components are condensed, and the boiling points of the components are effectively increased without increasing the freezing point.
In an alternative embodiment, the surfactant is a nonionic surfactant and/or a silicone surfactant.
The surfactant provided in the embodiment of the present application may be a nonionic surfactant, a silicone surfactant, or a mixture of a nonionic surfactant and a silicone surfactant. When the two kinds of the additives are a mixture, the mixing ratio may be 1:1 to 2, and for example, 1:1 or 1:2 may be used.
In an alternative embodiment, the nonionic surfactant is a polyoxyethylene ether surfactant.
In an alternative embodiment, the polyoxyethylene ether surfactant is an alkylphenol ethoxylate. For example, the surfactant selected in the embodiments of the present application may be a surfactant with product code TX-4. The silicone surfactant can also be selected from surfactant with the product code of KH 550.
Further, alkylphenol ethoxylates can lower C 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The surface tension among the cycloalkane, the polyisobutylene and the glycol enables a uniform system to be formed among the components.
In an alternative embodiment, C 5 ～C 35 Straight chain alkane and C 5 ～C 35 The boiling point of the cycloalkane of at least one of (a) and (b) is greater than 80 ℃.
It should be noted that, when the dewaxing agent provided in the embodiment of the present application is used, the dewaxing agent needs to be atomized by an atomizer together with natural gas, and then sent to natural gas treatment equipment for treatment. Thus, C in the selected dewaxing agent 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The boiling point of the cycloalkane(s) of (a) should not be too high, which would result in difficulty in atomizing the dewaxing agent, and the boiling point of the other components in the dewaxing agent should not be close to the boiling point of the wax component, which would tend to cause azeotropy if too close to the boiling point of the wax component. Thus, the examples of the present application define C 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The boiling point of the cycloalkane(s) of (a) is greater than 80 ℃. As an example, C is selected 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The boiling point of the cycloalkane(s) may be 90 ℃, 100 ℃ or 110 ℃, etc。
In an alternative embodiment, C 5 ～C 35 Straight chain alkane and C 5 ～C 35 The freezing point of at least one of the cycloalkanes of (a) is less than-20 ℃.
It should be noted that the freezing point is the temperature at which the crystal substance is solidified, and different crystals have different freezing points. The dewaxing agent provided by the embodiment of the application is injected into a natural gas treatment system together with natural gas when in use, and after the natural gas is treated and finished natural gas is generated, the dewaxing agent needs to be recovered, so that the freezing point of the components in the dewaxing agent cannot be too high, and if C in the dewaxing agent is too high 5 ～C 35 Straight chain alkane and C 5 ～C 35 The freezing point of the cycloalkane is too high, which causes the dewaxing agent to be difficult to lower in temperature during the recovery process, and thus the recovery of the dewaxing agent is difficult.
In an alternative embodiment, C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of the cycloalkanes of (a) has a pour point of less than-20 ℃.
Pour point is the lowest temperature at which the cooled sample can flow under the specified test conditions, expressed in degrees celsius.
It will be understood that when the wax precipitation and dewaxing agent are recovered, it is necessary for the wax precipitation and dewaxing agent to be in a fluid state for recovery, and therefore, by definition C 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The pour point of the cycloparaffin is less than-20 ℃ to ensure that the dewaxing agent and the wax after dewaxing are in a flowing state, the recovery is easy, the utilization efficiency is improved, and the dewaxing cost is reduced.
On the other hand, the embodiment of the present application also provides a natural gas dewaxing treatment method, which uses any of the above dewaxing agents to perform dewaxing treatment, as shown in fig. 1, and the method includes:
the raw material natural gas and the dewaxing agent enter a raw material gas precooler 2 through a pipeline atomizer 1, then sequentially enter a gas-liquid separator 3 and a raw material gas aftercooler 4, are cooled through the raw material gas aftercooler 4 and then enter a low-temperature separator 6 for low-temperature separation, and the dewaxing agent is added into an inlet of the raw material gas aftercooler 4 until the liquid level of the low-temperature separator 6 reaches the normal working liquid level.
It should be noted that, in between, the pipeline temperature between the raw material gas precooler 2 and the low-temperature separator 6 can be controlled by adjusting the opening degree of the bypass pipeline adjusting valve, and the pipeline temperature between the raw material gas precooler 4 and the low-temperature separator 6 is adjusted to be more than 3-5 ℃ of the formation temperature of the raw material gas hydrate by the bypass pipeline adjusting valve.
The natural gas separated by the low-temperature separator 6 enters the feed gas aftercooler 4 through a gas phase outlet at the top, then enters the feed gas precooler 2 through an outlet at the upper part of the feed gas aftercooler 4, and then enters an external conveying device through an outlet at the upper part of the feed gas precooler 2 to become the product natural gas.
The natural gas and the dewaxing agent separated by the feed gas aftercooler 4 are cooled by the refrigerator 5, the low-temperature dewaxing agent separated by the low-temperature separator 6 enters the injection pump through the liquid phase outlet at the bottom of the low-temperature separator 6, and then is injected into the feed gas precooler 2 through the pipeline atomizer 1 and the inlet of the feed gas precooler 2, and the dewaxing agent completes dewaxing in the natural gas treatment process along with the feed natural gas.
It should be noted that, if the dewaxing agent is to be recycled, the low-temperature dewaxing agent separated by the low-temperature separator 6 enters the injection pump through the liquid phase outlet at the bottom of the low-temperature separator 6, and then is injected into the raw material gas precooler 2 through the pipeline atomizer 1 and the inlet of the raw material gas precooler 2; according to the detected flow rate of the dewaxing agent in the pipeline between the pipeline atomizer 1 and the injection pump 5, the flow regulating valve controls the injection amount of the low-temperature dewaxing agent circularly injected into the feed gas precooler 2 by regulating the opening degree of the flow regulating valve. The injection pressure of the recyclable dewaxing agent when being injected into the raw material gas precooler 2 is 1-2 MPa higher than that of the natural gas raw material gas.
It can be understood that after the natural gas is injected into the natural gas treatment system together with the dewaxing agent provided by the embodiment of the application, the solidified paraffin is dissolved by the dewaxing agent, the non-solidified paraffin is dissolved, and the paraffin is sent out of the system by the natural gas which is continuously sent into the system to flow and is recovered, so that the dewaxing of the natural gas treatment system is completed.
The dewaxing agents provided in the examples of the present application will be further described below by way of alternative examples.
Example 1
Adding 40% of C into a high-speed shearing emulsifying machine 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The cycloparaffin, polyisobutylene with a content of 0.1%, ethylene glycol with a content of 0.1% and alkylphenol ethoxylate with a content of 0.5% are stirred at a high speed, and are sheared and mixed for 10min to obtain a uniform emulsifying system, namely the dewaxing agent prepared in the embodiment, and then the material is discharged.
Characterization test of dewaxing agent
Aiming at the application of the dewaxing agent in the natural gas dewaxing process, the working condition application condition and the wax dissolving effect are combined.
The following performance indicators are of primary concern:
1. boiling point: and testing according to the test standard GB/T616-2006 general method for measuring the boiling point of the chemical reagent.
2. Freezing point: according to the petroleum product pour point determination method, GB/T510.
3. Wax dissolving speed: weighing 50g of dewaxing agent in a beaker, adding 5g of solid paraffin, placing at room temperature, and testing the time required by the complete dissolution of the solid paraffin, wherein the shorter the time, the better the wax dissolution effect. The wax-dissolving time is based on 4hr (hr) of the pure cyclohexane, and more than 6hr is regarded as slow wax-dissolving speed and poor wax-dissolving effect.
4. And (3) viscosity testing: according to the test of the kinematic viscosity of GB/T265, the acting force of the wax-dissolving component and the metal wall surface can be approximately represented under the same condition.
In the dewaxing agent of this example C 5 ～C 35 Straight chain alkane and/or C 5 ～C 35 The components and the proportion of the cycloparaffin are shown in the table 1, and the performance test of the obtained dewaxing agent is shown in the table 2.
Example 2
The procedure was the same as in example 1, except that n-hexane was not used and the proportion of n-heptane was increased, the other components and the proportions are shown in Table 1, and the properties of the obtained wax-soluble component are shown in Table 2.
Example 3
The procedure was the same as in example 1, except that n-hexane was not used and the ratio of cyclohexane was increased, the other components and the ratio were as shown in Table 1, and the properties of the obtained wax-soluble component were as shown in Table 2.
Example 4
The procedure was the same as in example 1, except that the ratio of n-hexane was decreased and the ratio of polyisobutylene was increased, the other components and ratios are shown in Table 1, and the properties of the resulting soluble wax components are shown in Table 2.
Example 5
The procedure was carried out as in example 1 except that the surfactant was replaced with KH550, the other components and the compounding ratio were as shown in Table 1, and the properties of the obtained soluble wax component were as shown in Table 2.
Comparative example 1
The procedure was carried out as in example 1, except that n-hexane alone was used. The other components and the proportion are shown in table 1, and the properties of the obtained soluble wax component are shown in table 2.
Comparative example 2
The procedure was as in example 1, except that polyisobutene was not used. The other components and the proportion are shown in table 1, and the properties of the obtained soluble wax component are shown in table 2.
Comparative example 3
The procedure was carried out as in example 1, except that TX-4 was not used. The other components and the proportion are shown in table 1, and the properties of the obtained soluble wax component are shown in table 2.
TABLE 1
TABLE 2
As can be seen from the data in tables 1 and 2, the dewaxing agents provided by the embodiments of the present application overcome the problem of contradiction between boiling point and freezing point of the common liquid hydrocarbon solvents by synergistic combination of several components. The paraffin remover ensures a higher boiling point and a lower freezing point, can effectively remove solid wax formed in the natural gas dealkylation process, can adapt to the conventional natural gas low-temperature separation process, can prevent the paraffin-dissolving component from being gasified and entering the gas phase of the natural gas to be lost, can not be solidified in the low-temperature process to cause freezing and blocking, can promote the separation and the separation of high-carbon alkane in the gas phase in the low-temperature separation process by the paraffin-dissolving component, improves the low-temperature separation efficiency, and is a paraffin remover which is suitable for the natural gas dewaxing process.
The dewaxing agent provided by the embodiment of the application is suitable for a natural gas dewaxing treatment process, can complement a low-temperature separation process, overcomes the defect of freezing and blocking caused by the low-temperature separation process, avoids solid blocking, and improves the processing efficiency of natural gas.
The above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The dewaxing agent is characterized by comprising the following components in percentage by weight:
0.1 to 20 percent of polyisobutylene, 0.1 to 30 percent of glycol, 0.5 to 10 percent of surfactant and 40 to 99 percent of alkane;
wherein the alkane is C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of cycloalkanes of (a);
the molecular weight of the polyisobutylene is 500-1000;
the dewaxing agent is used for dewaxing natural gas.
2. The dewaxing agent according to claim 1, comprising the following components in percentage by weight: 4 to 10 percent of polyisobutylene, 0.5 to 5 percent of glycol, 0.5 to 5 percent of surfactant and 85 to 95 percent of alkane;
wherein the alkane is C 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of cycloalkanes of (a).
3. The dewaxing agent according to claim 1 or 2, wherein C is 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of the cycloalkanes of (a) has a boiling point of greater than 80 ℃.
4. The dewaxing agent according to claim 1 or 2, wherein C is 5 ～C 35 Straight chain alkane and C 5 ～C 35 The freezing point of at least one of the cycloalkanes of (a) is less than-20 ℃.
5. The dewaxing agent according to claim 1 or 2, wherein C is 5 ～C 35 Straight chain alkane and C 5 ～C 35 At least one of the cycloalkanes of (a) has a pour point of less than-20 ℃.
6. A dewaxing agent according to claim 1 or 2, wherein said surfactant is a non-ionic surfactant and/or a silicone surfactant.
7. The dewaxing agent according to claim 6, wherein the nonionic surfactant is a polyoxyethylene ether surfactant.
8. The dewaxing agent of claim 7, wherein the polyoxyethylene ether surfactant is an alkylphenol ethoxylate.
9. A method for dewaxing a natural gas by using the dewaxing agent according to any one of claims 1 to 8, the method comprising:
the method comprises the following steps that raw material natural gas and a dewaxing agent enter a raw material gas precooler (2) through a pipeline atomizer (1), then sequentially enter a gas-liquid separator (3) and a raw material gas aftercooler (4), enter a low-temperature separator (6) for low-temperature separation after being cooled by the raw material gas aftercooler (4), and are added into an inlet of the raw material gas aftercooler (4) until the liquid level of the low-temperature separator (6) reaches a normal working liquid level;
the natural gas separated by the low-temperature separator (6) enters the feed gas aftercooler (4) through a gas phase outlet at the top, enters the feed gas precooler (2) through an outlet at the upper part of the feed gas aftercooler (4), and then enters an external device through an outlet at the upper part of the feed gas precooler (2) to become product natural gas;
and the low-temperature dewaxing agent separated by the low-temperature separator (6) enters an injection pump through a liquid phase outlet at the bottom of the low-temperature separator (6), and then is injected into the raw material gas precooler (2) through the pipeline atomizer (1) through an inlet of the raw material gas precooler (2), and the dewaxing agent is accompanied with the raw material natural gas to complete dewaxing in the natural gas treatment process.
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