Hydrate decomposition inhibitor and its application and gas storage and transportation method

Abstract

The application relates to the technical field of natural gas safe storage and transportation, and discloses a hydrate decomposition inhibitor, application thereof and a gas storage and transportation method. The hydrate decomposition inhibitor contains an A component and a B component; the A component contains polydimethylsiloxane and a stabilizer; and the B component contains an amino acid promoter and a non-ionic surfactant. Under the premise of guaranteeing the generation rate and gas storage capacity in the hydrate generation stage, the hydrate decomposition inhibitor can significantly reduce the decomposition rate of hydrates under the storage and transportation conditions, improve the stability of the hydrates, and improve the safety of the hydrate storage and transportation technology. The hydrate decomposition inhibitor can also effectively inhibit the gas bubbles generated in the hydrate generation and decomposition process, improve the stability of the hydrates, and improve the hydrate decomposition recovery rate. The hydrate decomposition inhibitor has the characteristics of stable performance, economy and environmental protection, and has a good application prospect in the solid hydrate storage and transportation of natural gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas safe storage and transportation, in particular to a hydrate decomposition inhibitor and its application and a gas storage and transportation method. BACKGROUND

[0002] Natural gas is a kind of energy widely distributed in the world. Its excellent characteristics such as safety, environmental protection and high heat value make it the focus of attention in recent years. Its storage and transportation technology has also become the focus of research. Among many storage and transportation methods, the solid hydrate method for storing and transporting natural gas uses solid substances formed by natural gas and water under high pressure and low temperature to realize the storage, transportation and recovery of natural gas. In theory, 1 volume of solid hydrate can store and transport 170 volumes of natural gas molecules, and the gas storage performance is excellent. At the same time, the solid natural gas hydrate has a unique self-protection effect, that is, it can remain stable at normal pressure and slightly below freezing temperature after formation, making it possible to realize the technology in safety and economy.

[0003] The current common natural gas storage and transportation methods include pipeline gas method and liquefied natural gas storage and transportation method. The former has high cost in long-distance transportation and poor flexibility. The latter still needs to be improved in safety. Emerging storage and transportation methods, including compressed natural gas technology and adsorbed natural gas technology, still have great shortcomings in technical maturity and economic cost. Compared with other storage and transportation methods, the solid hydrate method for storing and transporting natural gas has the following advantages: (1) large theoretical gas storage capacity per unit volume, which can effectively save transportation cost while ensuring gas storage capacity; (2) safe and environmentally friendly hydrate formation process, which requires a relatively mild reaction condition without high temperature environment; (3) safe and convenient transportation process, solid hydrate has good stability and is not easy to cause explosion and other hazards during transportation; (4) not easily affected by impurities in natural gas, even if the natural gas has high impurity content, hydrate can still be formed under relatively mild conditions.

[0004] The current problems of solid hydrate storage and transportation technology are the decomposition of hydrate during storage and transportation, and the recovery rate and recovery rate of natural gas during the recovery stage of hydrate storage. In the hydrate formation stage, in order to accelerate the formation rate and improve the gas storage capacity, a certain amount of hydrate formation promoter is often added, but the addition of the promoter usually greatly affects the stability of the hydrate, causing serious decomposition during the storage and transportation process, which not only loses the stored natural gas, but also easily causes safety accidents. At the same time, the addition of traditional promoters also produces a large amount of bubbles during the decomposition of hydrate, which seriously hinders the decomposition process of hydrate, resulting in an unsatisfactory recovery rate of natural gas. SUMMARY

[0005] The present application aims to overcome the problems of easy decomposition during hydrate transportation and low yield during decomposition and recovery of gas in the prior art, and provides a hydrate decomposition inhibitor, application thereof and a gas storage and transportation method.

[0006] To achieve the above-mentioned object, the present application provides a hydrate decomposition inhibitor containing component A and component B.

[0007] The component A contains polydimethylsiloxane and a stabilizer; and the component B contains an amino acid promoter and a non-ionic surfactant.

[0008] Preferably, the weight ratio of the component A and the component B is 1:(1-25), preferably 1:(10-25).

[0009] Preferably, the stabilizer is selected from one or more of polyvinylpyrrolidone, polyvinyl alcohol, methyl cellulose and hydroxymethyl cellulose.

[0010] Preferably, the weight ratio of the polydimethylsiloxane and the stabilizer is 1:(0.1-1), preferably 1:(0.1-0.5).

[0011] Preferably, the hydrate decomposition inhibitor further contains a synergist.

[0012] Preferably, the weight ratio of the component A and the synergist is 1:(0.05-4), preferably 1:(0.5-2).

[0013] Preferably, the synergist is selected from one or more of Na2CO3, K2CO3, NaCl and KCl.

[0014] Preferably, the weight ratio of the amino acid promoter and the non-ionic surfactant is 1:(0.01-1); preferably 1:(0.1-0.5).

[0015] Preferably, the amino acid promoter is selected from leucine and / or norvaline.

[0016] Preferably, the non-ionic surfactant is selected from sorbitan fatty acid ester and / or sorbitan fatty acid ester polyoxyethylene ether.

[0017] Preferably, the sorbitan fatty acid ester is selected from one or more of Span 20, Span 40 and Span 80.

[0018] Preferably, the sorbitan fatty acid ester polyoxyethylene ether is selected from one or more of Tween 20, Tween 60 and Tween 80.

[0019] Preferably, the hydrate decomposition inhibitor further comprises an auxiliary agent.

[0020] Preferably, the weight ratio of the A component to the auxiliary agent is 1:(0.1-5), preferably 1:(0.1-1).

[0021] Preferably, the auxiliary agent is selected from TiO2 and / or SiO2.

[0022] The second aspect of the present application provides the use of the hydrate decomposition inhibitor described above in hydrate method gas storage and transportation.

[0023] The third aspect of the present application provides a method for gas storage and transportation, comprising a hydrate production process, a hydrate storage and transportation process, and a hydrate decomposition process, wherein:

[0024] (1) the hydrate production process is performed by dispersing the hydrate decomposition inhibitor described above in an aqueous phase, contacting the gas with the aqueous system having the hydrate decomposition inhibitor dispersed therein under hydrate formation conditions, to obtain the hydrate;

[0025] (2) the hydrate storage and transportation process is performed by storing and transporting the hydrate obtained in the hydrate production process under self-protection conditions of the hydrate;

[0026] (3) the hydrate decomposition process is performed by decomposing the hydrate obtained in the hydrate storage and transportation process under hydrate decomposition conditions to release the gas therein.

[0027] Preferably, the hydrate decomposition process further comprises defoaming treatment of the gas bubbles generated in the hydrate decomposition process by using a defoaming system comprising a filter screen.

[0028] Preferably, the hydrate formation conditions include a temperature of 0-10℃ and a pressure of 5-7 MPa.

[0029] Preferably, the amount of the hydrate decomposition inhibitor is 0.01-1% by weight of the water in the aqueous phase.

[0030] The inventors of the present application have found that the existing hydrate promoters only consider the improvement of the reaction rate in the hydrate formation stage and the storage capacity, and do not solve the problems of easy decomposition of the hydrate during storage and transportation and low recovery rate during decomposition and recovery. The hydrate decomposition inhibitor provided by the present application can significantly reduce the decomposition rate of the hydrate under storage and transportation conditions, improve the stability of the hydrate, and improve the safety of the hydrate storage and transportation technology, under the premise of ensuring the generation rate in the hydrate formation stage and the storage capacity. It can also effectively inhibit the gas bubbles generated during the hydrate formation and decomposition process, improve the stability of the hydrate, and improve the recovery rate of the hydrate decomposition. It has the characteristics of stable performance, economic and environmental protection, etc., and has good application prospect in solid hydrate storage and transportation of natural gas. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a cross-sectional schematic diagram of the performance evaluation device.

[0032] Figure 2 This is a picture taken of the reactor after the system was heated in Example 1.

[0033] Figure 3 This is a picture taken of the reactor after the system was heated in Example 8.

[0034] Figure 4 This is a picture taken of the reactor after the system was heated in Comparative Example 1.

[0035] Reference numerals

[0036] 1 Gas cylinder 2 First temperature sensor

[0037] 3 Top valve 4 Pressure sensor

[0038] 5 High and low temperature test box 6 connecting rope

[0039] 7 Filter 8 First Magnet

[0040] 9 Sapphire Reactor 10 Data Acquisition System

[0041] 11 Second magnet 12 Stirring bar

[0042] 13 Second temperature sensor DETAILED DESCRIPTION

[0043] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0044] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0045] In one aspect, the present invention provides a hydrate decomposition inhibitor comprising a component A and a component B;

[0046] The component A contains polydimethylsiloxane and a stabilizer; and the component B contains an amino acid accelerator and a nonionic surfactant.

[0047] The inventors have found that, by the synergistic effect of polydimethylsiloxane, amino acid promoter and non-ionic surfactant, the decomposition rate of hydrate under storage and transportation conditions can be significantly reduced, and the gas bubbles generated during the generation and decomposition of hydrate can be effectively inhibited, the stability of hydrate can be improved, and the recovery rate of hydrate decomposition can be improved.

[0048] In the present application, in order to better inhibit the decomposition of hydrate under storage and transportation conditions and improve the recovery rate during the decomposition of hydrate, the weight ratio of A component to B component can be 1:(1-25), preferably 1:(10-25). Specifically, it can be 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19 or 1:20.

[0049] In the present application, in order to better play the role of polydimethylsiloxane, a certain amount of stabilizer needs to be reasonably used. In the preferred embodiment, the stabilizer is selected from one or more of polyvinylpyrrolidone, polyvinyl alcohol, methyl cellulose and hydroxymethyl cellulose.

[0050] Further preferably, the weight ratio of polydimethylsiloxane to stabilizer is 1:(0.1-1), more preferably 1:(0.1-0.5). Specifically, it can be 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9 or 1:1.

[0051] In the preferred embodiment, in order to better inhibit the decomposition of hydrate under storage and transportation conditions and improve the recovery rate during the decomposition of hydrate, the hydrate decomposition inhibitor further contains a synergist. Further preferably, the synergist is selected from one or more of Na2CO3, K2CO3, NaCl and KCl.

[0052] More preferably, the weight ratio of A component to synergist is 1:(0.05-4), preferably 1:(0.5-2). Specifically, it can be 1:0.05, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, 1:2.5, 1:3, 1:3.5 or 1:4.

[0053] In a preferred embodiment, in order to better inhibit the decomposition of the hydrate under storage and transportation conditions and to improve the recovery rate when the hydrate is decomposed, the hydrate decomposition inhibitor further comprises an auxiliary agent. Further preferably, the auxiliary agent is selected from TiO2 and / or SiO2.

[0054] More preferably, the weight ratio of the A component to the auxiliary agent is 1:(0.1-5), preferably 1:(0.1-1). Specifically, it can be 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5 or 1:5.

[0055] In a preferred embodiment, in order to better inhibit the decomposition of the hydrate under storage and transportation conditions and to improve the recovery rate when the hydrate is decomposed, the weight ratio of the amino acid promoter to the non-ionic surfactant is 1:(0.01-1); preferably 1:(0.1-0.5). Specifically, it can be 1:0.01, 1:0.02, 1:0.05, 1:0.07, 1:0.09, 1:0.1, 1:0.15, 1:0.2, 1:0.25, 1:0.3, 1:0.35, 1:0.4, 1:0.45, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9 or 1:1.

[0056] In order to better inhibit the decomposition of the hydrate under storage and transportation conditions and to improve the recovery rate when the hydrate is decomposed, the non-ionic surfactant is selected from sorbitan fatty acid ester and / or sorbitan fatty acid ester polyoxyethylene ether.

[0057] Further preferably, the sorbitan fatty acid ester is selected from one or more than two of Span 20, Span 40 and Span 80.

[0058] Further preferably, the sorbitan fatty acid ester polyoxyethylene ether is selected from one or more than two of Tween 20, Tween 60 and Tween 80.

[0059] The hydrate decomposition inhibitor described in the present application can be obtained by mixing raw materials without complicated preparation process.

[0060] The present application also provides the use of the hydrate decomposition inhibitor described above in the storage and transportation of gas by hydrate method.

[0061] The present application also provides a gas storage and transportation method. The third aspect of the present application provides a method for storing and transporting gas, which comprises a hydrate production process, a hydrate storage and transportation process and a hydrate decomposition process, wherein:

[0062] (1) hydrate production process, by dispersing the hydrate decomposition inhibitor described above in an aqueous phase, contacting a gas with the aqueous system in which the hydrate decomposition inhibitor is dispersed under hydrate formation conditions, to obtain a hydrate;

[0063] (2) hydrate storage and transportation process, by storing and transporting the hydrate produced in the hydrate production process under self-protection conditions of the hydrate;

[0064] (3) hydrate decomposition process, by decomposing the hydrate produced in the hydrate storage and transportation process under hydrate decomposition conditions, to release the gas therein.

[0065] In order to further improve the recovery rate of the hydrate decomposition process and reduce the influence of the gas bubbles on the decomposition process, preferably, the hydrate decomposition process further comprises a defoaming system containing a filter screen for defoaming the gas bubbles produced in the hydrate decomposition process. The filter screen is moved up and down to achieve the defoaming effect. Further preferably, the defoaming system is composed of a magnet and a filter screen, and the magnet is used to move the filter screen up and down.

[0066] In the preferred embodiment, the hydrate formation conditions include a temperature of 0-10℃ and a pressure of 5-7 MPa.

[0067] In the preferred embodiment, the hydrate decomposition process is carried out by heating.

[0068] In the preferred embodiment, the amount of the hydrate decomposition inhibitor is 0.01-1% by weight of the water in the aqueous phase. Specifically, it can be 0.01%, 0.02%, 0.05%, 0.07%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1%.

[0069] In the present application, the gas to be used to produce the hydrate can be a single gas such as methane, propane, carbon dioxide and hydrogen, which needs to be stored and transported, or a mixture of gases such as natural gas. The aqueous system can be a simple aqueous phase or an oil-water two-phase system.

[0070] In the present application, the pressure is the gauge pressure unless otherwise specified.

[0071] The present application will be described in detail below by way of examples, but the scope of protection of the present application is not limited thereto.

[0072] In the following Examples 1-17 and Comparative Examples 1-5, a modified high-pressure sapphire reaction kettle is used as a performance evaluation device. The maximum working volume of the performance evaluation device is 50 cm 3 , the maximum working pressure is 16 MPa, and the working temperature range is 183K-423K.

[0073] Specifically, the schematic diagram of the performance evaluation device is as shown in the figure Figure 1 The performance evaluation device includes a gas cylinder 1, a first temperature sensor 2, a top valve 3, a pressure sensor 4, a high-low temperature experiment box 5, a connecting rope 6, a filter screen 7, a first magnet 8, a second magnet 11, a sapphire reaction kettle 9, a data acquisition system 10, a stirring rod 12, and a second temperature sensor 13.

[0074] The gas cylinder 1 is connected to the sapphire reaction kettle 9 through a pipeline, responsible for providing the required methane gas and pressure for hydrate generation; the first temperature sensor 2 is connected to the top of the sapphire reaction kettle 9, used for real-time monitoring of the temperature in the kettle; the pressure sensor 4 is connected to the top of the sapphire reaction kettle 9, used for real-time monitoring of the pressure in the kettle; the top valve 3 is responsible for controlling the entry and exit of gas in the kettle; the filter screen 7 is connected to the top of the reaction kettle through the connecting rope 6, preventing the filter screen from falling into the bottom of the reaction kettle; the magnet 8 and the magnet 11 are both connected to external mechanical devices through connecting ropes, the magnet 8 moves up and down in the upper half of the outside of the sapphire reaction kettle 9, driving the metal filter screen 7 in the kettle to move up and down to eliminate bubbles, and the magnet 11 moves up and down in the lower half of the outside of the sapphire reaction kettle 9, driving the stirring rod 12 in the kettle to provide impact stirring; the sapphire reaction kettle 9 is a fully transparent sapphire reaction kettle, which is arranged inside the high-low temperature experiment box, and the high-low temperature experiment box 5 is used to provide the required temperature environment for the reaction; the second temperature sensor 13 is connected to the high-low temperature experiment box, used to monitor the temperature inside the high-low temperature experiment box 5; the data acquisition system 10 is a computer data automatic acquisition system, used to record the system temperature, pressure, and reaction time.

[0075] The specific steps of the performance evaluation experiment using the above performance evaluation device are as follows:

[0076] (1) After cleaning the entire experimental system, prepare a test solution (10 mL) containing a hydrate decomposition inhibitor and place it at the bottom of the sapphire reaction kettle body, vacuum the system, and introduce experimental gas to replace it more than 3 times;

[0077] (2) Set the system temperature to the experimental temperature, when the temperature in the reaction kettle reaches the preset value and stabilizes for 5 hours, introduce a certain amount of experimental gas to make the system reach dissolution equilibrium (the pressure of the introduced gas is less than the hydrate equilibrium pressure at this temperature);

[0078] (3) Introduce experimental gas to the experimental pressure, close the gas inlet valve, and open the impact stirring, the stirring speed is constant throughout the experiment; observe the macroscopic morphological changes in the system, and use a video recorder to record online, the system temperature, pressure, and reaction time are recorded by a computer data automatic acquisition system;

[0079] (4) When white hydrate particles appear in the system, record the time as the hydrate induction time;

[0080] (5) Continue the experiment, real-time observation of the hydrate particles appear in the system after the macroscopic morphology evolution; At the same time, from the induction time, record the system pressure for 30 min and 120 min after the continuous reaction;

[0081] (6) With the continuous formation of hydrate, when the system pressure is stable and remains 1.0 h, reduce the system temperature to 268.15 K, wait for the temperature to be stable, turn off the stirrer, exhaust the gas in the reactor, close the exhaust valve, observe the hydrate decomposition and record the system pressure at 60 min and 120 min.

[0082] (7) The system temperature is raised to 303 K, the impact type stirring is opened, the system pressure is continuously recorded, and the situation of bubble generation during the decomposition of gas hydrate is observed. After the gas hydrate in the reactor is completely decomposed, exhaust the gas and liquid, and start the next experiment.

[0083] The calculation method of the gas storage capacity in the solid hydrate formation stage is as follows:

[0084] When the methane hydrate just appears, the molar molecular weight of methane in the system is obtained from the actual gas state equation:

[0085]

[0086] The molar molecular weight of the gas in the system at the end of the formation stage is obtained from the actual gas state equation:

[0087]

[0088] In the formula: n0 and n e are the initial methane gas consumption and the methane gas consumption at the end, mol; P0 and P e are the initial pressure and the pressure at the end of the formation stage, Pa; V g is the gas phase volume in the reactor, m 3 ; Z0 and Z e are the gas compressibility factors of the system at the beginning and the end of the hydrate formation stage, calculated by the Peng-Robinson equation; R is the gas constant, J / (mol*K); T is the experimental set temperature, K.

[0089] Then the methane gas consumption for hydrate formation in the hydrate formation stage is:

[0090] Δn = n0-n e

[0091] The gas storage capacity in the hydrate formation stage is:

[0092]

[0093] wherein, is the molar amount of water in the system solution.

[0094] The calculation method of the hydrate decomposition degree HD in the storage stage is as follows:

[0095]

[0096] wherein, P0 is the initial storage pressure after exhaust, P d is the system pressure after a certain storage time, P b is the system equilibrium pressure after complete decomposition by temperature rise. The greater the hydrate decomposition degree parameter, the more serious the decomposition of the hydrate in the storage stage.

[0097] The recovery efficiency in the decomposition stage is evaluated by observing the generation of bubbles. The fewer the generated bubbles, the higher the recovery efficiency.

[0098] The gas used in all the following comparative examples and examples is methane gas with a purity of 99.99%.

[0099] Example 1

[0100] This example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, leucine, Span 20, Na2CO3, SiO2 in a weight ratio of 1:0.1:1:1:0.1:0.5, i.e. the weight ratio of component A, component B, synergist and adjuvant is 1:1.82:0.099:0.495.

[0101] This example uses the above performance evaluation device for performance evaluation, 10ml of deionized water is prepared and the above hydrate decomposition inhibitor is added in an amount of 0.05% of the system water mass, the experimental pressure is 7.0MPa, and the experimental temperature is 276.2K. It is found by the sapphire reaction kettle that the induction time of the hydrate is 3.7min.

[0102] From the appearance of hydrate particles in the system, the system pressures at 30min and 120min are 5024kPa and 4325kPa respectively, and the calculated gas storage amount is 0.1286mol / mol

[0103] From the exhaust of the gas in the kettle, the system pressures at 60min and 120min are 24kPa and 39kPa respectively.

[0104] From the start of the system temperature rise, the system pressures at 30min and 60min are 3021kPa and 3542kPa respectively, the calculated hydrate decomposition degree parameter is 1.10%, and a small amount of bubbles are generated at the gas-liquid interface (as shown in Figure 2 ).

[0105] Example 2

[0106] The present example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, leucine, Tween 80, NaCl, SiO2 in a weight ratio of 1:0.1:5:0.05:0.2:0.2, i.e. the weight ratio of A component, B component, synergist and adjuvant is 1:4.59:0.18:0.18.

[0107] The present example is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.1% of the above hydrate decomposition inhibitor based on the mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found by a sapphire reaction kettle that the induction time of hydrate is 4.0 min.

[0108] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 4448 kPa and 3976 kPa, respectively. The calculated gas storage is 0.1455 mol / mol.

[0109] From the exhaust of the gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 19 kPa and 33 kPa, respectively.

[0110] From the start of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 3327 kPa and 4007 kPa, respectively. The calculated hydrate decomposition degree parameter is 0.823%, and a small amount of gas bubbles is generated at the gas-liquid interface.

[0111] Example 3

[0112] The present example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, methyl cellulose, n-valine, Span 40, K2CO3, SiO2 in a weight ratio of 1:0.2:10:1:0.6:0.2, i.e. the weight ratio of A component, B component, synergist and adjuvant is 1:8.42:0.5:0.167.

[0113] The present example is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.2% of the above hydrate decomposition inhibitor based on the mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found by a sapphire reaction kettle that the induction time of hydrate is 2.9 min.

[0114] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 4386 kPa and 3875 kPa, respectively, and the calculated gas storage is 0.503 mol / mol.

[0115] From the exhaust gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 21 kPa and 35 kPa, respectively.

[0116] From the start of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 3729 kPa and 4141 kPa, respectively, and the calculated hydrate decomposition degree parameter is 0.845%, and a small amount of gas bubbles are generated at the gas-liquid interface.

[0117] Example 4

[0118] The present example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinyl alcohol, leucine, Span 80, Na2CO3, SiO2 in a weight ratio of 1:0.1:15:2:0.8:0.5, i.e. the weight ratio of A component, B component, synergist and adjuvant is 1:15.45:0.73:0.45.

[0119] The present example is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.5% of the above hydrate decomposition inhibitor by weight of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K, and through the sapphire reaction kettle, it is found that the induction time of the hydrate is 1.3 min.

[0120] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 4538 kPa and 3694 kPa, respectively, and the calculated gas storage is 0.1589 mol / mol.

[0121] From the exhaust gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 17 kPa and 36 kPa, respectively.

[0122] From the start of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 4197 kPa and 4724 kPa, respectively, and the calculated hydrate decomposition degree parameter is 0.822%, and basically no gas bubbles are generated at the gas-liquid interface.

[0123] Example 5

[0124] The embodiment provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, norvaline, leucine, Tween 20, NaCl, SiO2 in a weight ratio of 1:0.4:12:12:4:1:0.5, namely, the weight ratio of A component, B component, synergist and auxiliary agent is 1:20:0.71:0.36.

[0125] The embodiment is evaluated by using the performance evaluation device, 10ml of deionized water is prepared, and the above-mentioned hydrate decomposition inhibitor with a system water mass of 0.3% is added, the experimental pressure is 7.0MPa, the experimental temperature is 276.2K, and it is found by a sapphire reaction kettle that the induction time of the hydrate is 2.1min.

[0126] From the appearance of hydrate particles in the system, the reaction is carried out to 30min and 120min, and the system pressure is 4243kPa and 3577kPa respectively, and the calculated gas storage is 0.1644mol / mol.

[0127] From the exhaust of the gas in the kettle, the reaction is carried out to 60min and 120min, and the system pressure is 19kPa and 38kPa respectively.

[0128] From the system temperature rise, the reaction is carried out to 30min and 60min, and the system pressure is 4085kPa and 4530kPa respectively, the calculated hydrate decomposition degree parameter is 0.839%, and no bubbles are generated at the gas-liquid interface.

[0129] Embodiment 6

[0130] The embodiment provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, norvaline, Tween 80, KCl, TiO2 in a weight ratio of 1:0.2:22:2:1:0.5, namely, the weight ratio of A component, B component, synergist and auxiliary agent is 1:20:0.83:0.42.

[0131] The embodiment is evaluated by using the performance evaluation device, 10ml of deionized water is prepared, and the above-mentioned hydrate decomposition inhibitor with a system water mass of 0.3% is added, the experimental pressure is 7.0MPa, the experimental temperature is 276.2K, and it is found by a sapphire reaction kettle that the induction time of the hydrate is 1.4min.

[0132] From the appearance of hydrate particles in the system, the reaction is carried out to 30min and 120min, and the system pressure is 4247kPa and 3577kPa respectively, and the calculated gas storage is 0.1664mol / mol.

[0133] From the beginning of the gas in the reactor, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 18 kPa and 37 kPa, respectively.

[0134] From the beginning of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 3803 kPa and 4584 kPa, respectively, and the calculated hydrate decomposition degree parameter is 0.807%, and no bubbles are generated at the gas-liquid interface.

[0135] Example 7

[0136] This example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, hydroxymethyl cellulose, norvaline, Span 20, K2CO3, SiO2 in a weight ratio of 1:0.2:25:3:1.5:0.5, i.e. the weight ratio of A component, B component, synergist and auxiliary agent is 1:23.33:1.25:0.42.

[0137] This example is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.5% of the above hydrate decomposition inhibitor based on the mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K, and it is found by the sapphire reaction kettle that the induction time of the hydrate is 1.5 min.

[0138] From the beginning of the hydrate particles in the system, the reaction proceeds to the 30th min and the 120th min, and the system pressure is 4102 kPa and 3486 kPa, respectively, and the calculated gas storage is 0.1687 mol / mol.

[0139] From the beginning of the gas in the reactor, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 20 kPa and 33 kPa, respectively.

[0140] From the beginning of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 4123 kPa and 4648 kPa, respectively, and the calculated hydrate decomposition degree parameter is 0.7099%, and no bubbles are generated at the gas-liquid interface.

[0141] Example 8

[0142] This example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, norvaline, Span 20, Na2CO3, SiO2 in a mass ratio of 1:0.5:30:5:1:0.5, i.e. the weight ratio of A component, B component, synergist and auxiliary agent is 1:23.33:0.67:0.33.

[0143] The embodiment is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.5% of the above hydrate decomposition inhibitor by mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found by the sapphire reaction kettle that the induction time of the hydrate is 1.0 min.

[0144] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 4565 kPa and 3689 kPa, respectively, and the gas storage amount is 0.1591 mol / mol.

[0145] From the exhaust of the gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 9 kPa and 22 kPa, respectively.

[0146] From the start of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 4891 kPa and 4384 kPa, respectively, and the hydrate decomposition degree parameter is 0.5017%, and basically no bubbles are generated at the gas-liquid interface. Figure 3 ).

[0147] Example 9

[0148] The embodiment provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, hydroxymethyl cellulose, leucine, Tween 20, NaCl, SiO2 in a weight ratio of 1:0.5:30:6:1.5:1, i.e. the weight ratio of component A, component B, synergist and auxiliary agent is 1:24:1:0.67.

[0149] The embodiment is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.5% of the above hydrate decomposition inhibitor by mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found by the sapphire reaction kettle that the induction time of the hydrate is 1.4 min.

[0150] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 3978 kPa and 3373 kPa, respectively, and the calculated gas storage amount is 0.1739 mol / mol.

[0151] From the exhaust of the gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 9 kPa and 25 kPa, respectively.

[0152] From the start of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 4369 kPa and 4793 kPa, respectively, and the calculated hydrate decomposition degree parameter is 0.5215%, and basically no bubbles are generated at the gas-liquid interface.

[0153] Example 10

[0154] This example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, norvaline, Tween 60, K2CO3, TiO2 in a weight ratio of 1:0.2:20:4:1:0.5, i.e. the weight ratio of A component, B component, synergist and adjuvant is 1:20:0.83:0.42.

[0155] This example is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.8% of the above hydrate decomposition inhibitor based on the mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found by the sapphire reaction kettle that the induction time of the hydrate is 0.8 min.

[0156] From the beginning of the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 4053 kPa and 3357 kPa, respectively. The calculated gas storage is 0.1747 mol / mol.

[0157] From the beginning of the exhaust of the gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 19 kPa and 30 kPa, respectively.

[0158] From the beginning of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 4365 kPa and 4814 kPa, respectively. The calculated hydrate decomposition degree parameter is 0.6231%, and no bubbles are generated at the gas-liquid interface.

[0159] Example 11

[0160] This example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, methyl cellulose, leucine, Span 80, KCl, TiO2 in a weight ratio of 1:0.5:30:6:1.5:1, i.e. the weight ratio of A component, B component, synergist and adjuvant is 1:24:1:0.67.

[0161] This example is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.8% of the above hydrate decomposition inhibitor based on the mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found by the sapphire reaction kettle that the induction time of the hydrate is 1.0 min.

[0162] From the beginning of the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 3984 kPa and 3281 kPa, respectively. The gas storage is 0.1782 mol / mol.

[0163] From the beginning of the reaction, the system pressure was 11 kPa and 23 kPa at 60 min and 120 min, respectively.

[0164] From the beginning of the reaction, the system pressure was 11 kPa and 23 kPa at 60 min and 120 min, respectively.

[0165] Example 12

[0166] The present example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, n-valine, Span 20, NaCl, TiO2 in a weight ratio of 1:0.5:30:6:1.5:1, i.e. the weight ratio of A component, B component, synergist and adjuvant is 1:24:1:0.67.

[0167] The present example is evaluated by using the above performance evaluation device, 10 ml of deionized water is prepared, and 0.8% of the above hydrate decomposition inhibitor by weight of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found by the sapphire reaction kettle that the induction time of hydrate is 1.2 min.

[0168] From the beginning of the reaction, the system pressure was 11 kPa and 23 kPa at 60 min and 120 min, respectively.

[0169] From the beginning of the reaction, the system pressure was 11 kPa and 23 kPa at 60 min and 120 min, respectively.

[0170] From the beginning of the reaction, the system pressure was 11 kPa and 23 kPa at 60 min and 120 min, respectively.

[0171] Example 13

[0172] The present example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, n-valine, sorbitan palmitate, KCl, SiO2 in a weight ratio of 1:0.2:20:4:1.5:0.2, i.e. the weight ratio of A component, B component, synergist and adjuvant is 1:20:1.25:0.17.

[0173] The embodiment is evaluated by using the above performance evaluation device, 10ml of deionized water is prepared, and 1.0% of the above hydrate decomposition inhibitor based on the mass of the system water is added, the experimental pressure is 7.0MPa, and the experimental temperature is 276.2K. It is found by the sapphire reaction kettle that the induction time of the hydrate is 0.9min.

[0174] From the appearance of hydrate particles in the system, the reaction proceeds to 30min and 120min, and the system pressure is 3987kPa and 3267kPa, respectively, and the gas storage amount is 0.1789mol / mol.

[0175] From the exhaust of the gas in the kettle, the reaction proceeds to 60min and 120min, and the system pressure is 16kPa and 25kPa, respectively.

[0176] From the start of the system temperature rise, the bubble elimination system is started, the reaction proceeds to 30min and 60min, and the system pressure is 4365kPa and 4929kPa, respectively, the hydrate decomposition degree parameter is 0.5477%, and basically no bubbles are generated at the gas-liquid interface.

[0177] Example 14

[0178] The embodiment provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, hydroxymethyl cellulose, n-valine, Tween 80, KCl, SiO2 in a weight ratio of 1:0.2:28:2:1:0.6, i.e. the weight ratio of component A, component B, synergist and auxiliary agent is 1:25:0.83:0.5.

[0179] The embodiment is evaluated by using the above performance evaluation device, 10ml of deionized water is prepared, and 1.0% of the above hydrate decomposition inhibitor based on the mass of the system water is added, the experimental pressure is 7.0MPa, and the experimental temperature is 276.2K. It is found by the sapphire reaction kettle that the induction time of the hydrate is 1.2min.

[0180] From the appearance of hydrate particles in the system, the reaction proceeds to 30min and 120min, and the system pressure is 3825kPa and 3196kPa, respectively, and the calculated gas storage amount is 0.1822mol / mol.

[0181] From the exhaust of the gas in the kettle, the reaction proceeds to 60min and 120min, and the system pressure is 14kPa and 29kPa, respectively.

[0182] From the start of the system temperature rise, the reaction proceeds to 30min and 60min, and the system pressure is 4307kPa and 5020kPa, respectively, the calculated hydrate decomposition degree parameter is 0.5776%, and no bubbles are generated at the gas-liquid interface.

[0183] Example 15

[0184] This example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, leucine, sorbitan laurate, KCl, TiO2 in a weight ratio of 1:0.5:30:6:1.5:1, i.e. the weight ratio of A component, B component, synergist and adjuvant is 1:24:1:0.67.

[0185] This example uses the above performance evaluation device for evaluation, 10 ml of deionized water is prepared, and 1.0% of the above hydrate decomposition inhibitor based on the mass of the system water is added. The experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found through the sapphire reaction kettle that the induction time of the hydrate is 1.1 min.

[0186] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 3878 kPa and 3302 kPa, respectively. The calculated gas storage is 0.1773 mol / mol.

[0187] From the exhaust of the gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 11 kPa and 22 kPa, respectively.

[0188] From the start of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 4195 kPa and 4884 kPa, respectively. The calculated hydrate decomposition degree parameter is 0.4503%, and there is basically no bubble at the gas-liquid interface.

[0189] Example 16

[0190] This example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, leucine, Span 20, SiO2 in a weight ratio of 1:0.5:30:5:0.5, i.e. the weight ratio of A component, B component and adjuvant is 1:23.33:0.33.

[0191] This example uses the above performance evaluation device for performance evaluation, 10 ml of deionized water is prepared, and 0.5% of the above hydrate decomposition inhibitor based on the mass of the system water is added. The experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found through the sapphire reaction kettle that the induction time of the hydrate is 1.7 min.

[0192] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 4169 kPa and 3587 kPa, respectively. The gas storage is 0.1639 mol / mol.

[0193] From the beginning of the gas in the reactor, the reaction proceeds to the 60 min and 120 min system pressure is 13 kPa and 25 kPa, respectively.

[0194] From the beginning of the system temperature, the reaction proceeds to the 30 min and 60 min system pressure is 4905 kPa and 4517 kPa, respectively, the degree of hydrate decomposition parameter is 0.5534%, and there is basically no bubble at the gas-liquid interface.

[0195] Example 17

[0196] This example provides a hydrate decomposition inhibitor, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, leucine, Span 20, Na2CO3 in a weight ratio of 1:0.5:30:5:1, i.e. the weight ratio of A component, B component, synergist is 1:23.33:0.67

[0197] This example uses the above performance evaluation device to evaluate the performance, 10 ml of deionized water is prepared, and 0.5% of the above hydrate decomposition inhibitor based on the mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found through the sapphire reactor that the induction time of the hydrate is 1.6 min.

[0198] From the beginning of the system temperature, the reaction proceeds to the 30 min and 60 min system pressure is 4905 kPa and 4517 kPa, respectively, the degree of hydrate decomposition parameter is 0.5534%, and there is basically no bubble at the gas-liquid interface.

[0199] From the beginning of the gas in the reactor, the reaction proceeds to the 60 min and 120 min system pressure is 13 kPa and 25 kPa, respectively.

[0200] From the beginning of the system temperature, the reaction proceeds to the 30 min and 60 min system pressure is 4905 kPa and 4517 kPa, respectively, the degree of hydrate decomposition parameter is 0.5534%, and there is basically no bubble at the gas-liquid interface.

[0201] Example 18

[0202] The same hydrate decomposition inhibitor and performance evaluation device as in Example 17 are used, and the difference between the performance evaluation process and Example 17 is that step 7 further includes: while stirring, the first magnet is controlled to move up and down in the upper half of the sapphire reactor outside, driving the metal filter screen in the reactor to move up and down.

[0203] From the beginning of the system temperature, the reaction proceeds to the 30 min and 60 min system pressure is 4905 kPa and 4517 kPa, respectively, the degree of hydrate decomposition parameter is 0.5534%, and there is basically no bubble at the gas-liquid interface.

[0204] From the beginning of the reaction, the system pressure was 15 kPa and 27 kPa at the 60th min and the 120th min, respectively.

[0205] From the beginning of the reaction, the system pressure was 4192 kPa and 4649 kPa at the 30th min and the 60th min, respectively, and the hydrate decomposition degree parameter was 0.5807%, and there was basically no bubble at the gas-liquid interface.

[0206] Comparative Example 1

[0207] The present comparative example provides a composition, which is obtained by mixing n-valine, Span 20, Na2CO3, SiO2in a weight ratio of 30:5:1:0.5.

[0208] The present comparative example uses the above performance evaluation device to evaluate the performance, 10 ml of deionized water is prepared, and 0.5% of the above composition by mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. Through the sapphire reaction kettle, it is found that the induction time of the hydrate is 1.5 min.

[0209] From the beginning of the reaction, the system pressure was 3976 kPa and 3428 kPa at the 30th min and the 120th min, respectively, and the gas storage capacity was 0.1714 mol / mol.

[0210] From the beginning of the reaction, the system pressure was 127 kPa and 168 kPa at the 60th min and the 120th min, respectively.

[0211] From the beginning of the reaction, the system pressure was 4108 Pa and 4722 kPa at the 30th min and the 60th min, respectively, and the hydrate decomposition degree parameter was 3.5571%, and there were some bubbles at the gas-liquid interface (such as Figure 4 ).

[0212] Comparative Example 2

[0213] The present comparative example provides a composition, which is obtained by mixing polydimethylsiloxane, n-valine, Span 20, Na2CO3, SiO2in a weight ratio of 1:20:5:1:0.5.

[0214] The present example uses the above performance evaluation device to evaluate the performance, 10 ml of deionized water is prepared, and 0.5% of the above composition by mass of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. Through the sapphire reaction kettle, it is found that the induction time of the hydrate is 1.2 min.

[0215] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 4182 kPa and 3469 kPa, respectively, and the gas storage is 0.1695 mol / mol.

[0216] From the exhaust of gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 66 kPa and 87 kPa, respectively.

[0217] From the start of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 4172 kPa and 4670 kPa, respectively, and the hydrate decomposition degree parameter is 1.8629%, and there are some bubbles at the gas-liquid interface.

[0218] Comparative Example 3

[0219] The present comparative example provides a composition, which is obtained by mixing glycerol polyether of GP type, polyvinylpyrrolidone, n-valine, Span 20, Na2CO3, SiO2 in a weight ratio of 1:0.5:30:5:1:0.5.

[0220] The present comparative example uses the above performance evaluation device to evaluate the performance, 10 ml of deionized water is prepared, and 0.5% of the above composition by weight of the system water is added, the experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. Through the sapphire reaction kettle, it is found that the induction time of hydrate is 2.8 min.

[0221] From the appearance of hydrate particles in the system, the reaction proceeds to 30 min and 120 min, and the system pressure is 4520 kPa and 3969 kPa, respectively, and the gas storage is 0.1458 mol / mol.

[0222] From the exhaust of gas in the kettle, the reaction proceeds to the 60th min and the 120th min, and the system pressure is 84 kPa and 127 kPa, respectively.

[0223] From the start of the system temperature rise, the reaction proceeds to the 30th min and the 60th min, and the system pressure is 3529 kPa and 4016 kPa, respectively, and the hydrate decomposition degree parameter is 3.1616%, and there are no bubbles at the gas-liquid interface.

[0224] Comparative Example 4

[0225] The present comparative example provides a composition, which is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, sodium dodecyl sulfate, Na2CO3, SiO2 in a weight ratio of 1:0.5:35:1:0.5.

[0226] The performance evaluation device is used to evaluate the performance of the above-mentioned composition. 10 ml of deionized water is prepared, and 0.5% of the above-mentioned composition by mass of the system is added. The experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found through the sapphire reaction kettle that the induction time of the hydrate is 1.3 min.

[0227] From the appearance of hydrate particles in the system, the system pressure is 4317 kPa and 3435 kPa, respectively, and the gas storage amount is 0.1711 mol / mol when the reaction is carried out for 30 min and 120 min, respectively.

[0228] From the exhaust of gas in the kettle, the system pressure is 175 kPa and 214 kPa, respectively, when the reaction is carried out for 60 min and 120 min, respectively.

[0229] From the start of the system temperature rise, the system pressure is 4267 kPa and 4714 kPa, respectively, when the reaction is carried out for 30 min and 60 min, respectively, and the hydrate decomposition degree parameter is 4.5397%, and there are some bubbles at the gas-liquid interface.

[0230] Comparative Example 5

[0231] The composition of this comparative example is obtained by mixing polydimethylsiloxane, polyvinylpyrrolidone, n-valine, sodium dodecylbenzenesulfonate, Na2CO3, SiO2 in a weight ratio of 1:0.5:30:5:1:0.5.

[0232] The performance evaluation device is used to evaluate the performance of the above-mentioned composition. 10 ml of deionized water is prepared, and 0.5% of the above-mentioned composition by mass of the system is added. The experimental pressure is 7.0 MPa, and the experimental temperature is 276.2 K. It is found through the sapphire reaction kettle that the induction time of the hydrate is 3.1 min.

[0233] From the appearance of hydrate particles in the system, the system pressure is 4820 kPa and 4039 kPa, respectively, and the gas storage amount is 0.1424 mol / mol when the reaction is carried out for 30 min and 120 min, respectively.

[0234] From the exhaust of gas in the kettle, the system pressure is 24 kPa and 39 kPa, respectively, when the reaction is carried out for 60 min and 120 min, respectively.

[0235] From the start of the system temperature rise, the system pressure is 4729 kPa and 3924 kPa, respectively, when the reaction is carried out for 30 min and 60 min, respectively, and the hydrate decomposition degree parameter is 0.9937%, and no bubbles are generated at the gas-liquid interface.

[0236] The preferred embodiments of the present application are described in detail above, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including that each technical feature is combined in any other suitable manner. These simple modifications and combinations should also be considered as disclosed by the present application and fall within the protection scope of the present application.

Claims

1. A hydrate decomposition inhibitor, characterized in that: The hydrate decomposition inhibitor contains component A and component B; Wherein, the component A contains polydimethylsiloxane and a stabilizer; the component B contains an amino acid accelerator and a nonionic surfactant; The weight ratio of component A to component B is 1:(1-25); The stabilizer is selected from one or more of polyvinyl pyrrolidone, polyvinyl alcohol, methyl cellulose and hydroxymethyl cellulose; The weight ratio of polydimethylsiloxane to stabilizer is 1: (0.1~1); The weight ratio of amino acid accelerator to nonionic surfactant is 1: (0.01~1); The amino acid promoter is selected from leucine and / or norvaline; The hydrate decomposition inhibitor further contains an auxiliary agent and / or a synergist, wherein the synergist is selected from one or more of Na2CO3, K2CO3, NaCl and KCl, and the auxiliary agent is selected from TiO2 and / or SiO2.

2. The hydrate decomposition inhibitor according to claim 1, characterized in that The weight ratio of component A to component B is 1:(10~25).

3. The hydrate decomposition inhibitor according to claim 1, characterized in that The weight ratio of the polydimethylsiloxane to the stabilizer is 1:(0.1-0.5).

4. The hydrate decomposition inhibitor according to any one of claims 1 to 3, characterized in that The weight ratio of the component A to the synergist is 1:(0.05-4).

5. The hydrate decomposition inhibitor according to claim 4, characterized in that The weight ratio of the component A to the synergist is 1:(0.5-2).

6. The hydrate decomposition inhibitor according to claim 1, characterized in that The weight ratio of the amino acid accelerator to the nonionic surfactant is 1: (0.1~0.5).

7. The hydrate decomposition inhibitor according to claim 1, characterized in that The nonionic surfactant is selected from sorbitan fatty acid ester and / or sorbitan fatty acid ester polyoxyethylene ether.

8. The hydrate decomposition inhibitor according to claim 7, characterized in that The sorbitan fatty acid ester is selected from one or more of Span 20, Span 40 and Span 80.

9. The hydrate decomposition inhibitor according to claim 7, characterized in that The sorbitan fatty acid ester polyoxyethylene ether is selected from one or more of Tween 20, Tween 60 and Tween 80.

10. The hydrate decomposition inhibitor according to claim 1, characterized in that The weight ratio of the component A to the auxiliary agent is 1: (0.1-5).

11. The hydrate decomposition inhibitor according to claim 10, characterized in that The weight ratio of the component A to the auxiliary agent is 1: (0.1~1).

12. Use of the hydrate decomposition inhibitor according to any one of claims 1 to 11 in gas storage and transportation using the hydrate method.

13. A gas storage and transportation method, characterized in that: The method comprises a hydrate production process, a hydrate storage and transportation process, and a hydrate decomposition process, wherein: (1) A hydrate production process comprising dispersing the hydrate decomposition inhibitor according to any one of claims 1 to 11 in an aqueous phase, and contacting a gas with the aqueous system in which the hydrate decomposition inhibitor is dispersed under hydrate formation conditions to obtain a hydrate; (2) The hydrate storage and transportation process involves storing and transporting the hydrates produced in the hydrate production process under the self-protection conditions of the hydrates; (3) The hydrate decomposition process is to decompose the hydrates that have passed through the hydrate storage and transportation process under the conditions of hydrate decomposition to release the gas therein.

14. The method according to claim 13, characterized in that The hydrate decomposition step also includes defoaming bubbles generated by the hydrate decomposition using a defoaming system containing a filter during the hydrate decomposition process.

15. The method according to claim 13 or 14, characterized in that Hydrate formation conditions include: temperature of 0~10℃ and pressure of 5~7MPa.

16. The method according to claim 13 or 14, characterized in that The amount of the hydrate decomposition inhibitor used is 0.01 to 1% of the weight of water in the aqueous phase.

Images