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CN-121975504-A - Polyglycerol-containing compound hydrate thermodynamic inhibitor and application thereof

CN121975504ACN 121975504 ACN121975504 ACN 121975504ACN-121975504-A

Abstract

The application relates to a polyglycerol-containing compound hydrate thermodynamic inhibitor and application thereof, comprising 1-3mol% of sorbitol, 5-10mol% of polyglycerol and 0-50mol% of glycerol, wherein the three are mixed with water. The hydrate inhibitor can solve the problem of hydrate blockage under different working conditions, reduce the aggregation degree of the hydrate while ensuring the nucleation and growth of the hydrate, reduce the blockage probability in a pipeline, solve the problems of large dosage, environmental protection and the like caused by the traditional thermodynamic inhibitor, and has the characteristic of high supercooling resistance.

Inventors

  • XU YUBING
  • HAN HONGXIA
  • ZHANG HANSONG
  • ZHANG QIFAN
  • LIN MIN
  • XIU QIANG

Assignees

  • 石河子市敦华气体技术有限公司

Dates

Publication Date
20260505
Application Date
20251225

Claims (8)

  1. 1. A compound hydrate thermodynamic inhibitor containing polyglycerol is characterized by comprising 1-3mol% of sorbitol, 5-10mol% of polyglycerol and 0-50mol% of glycerol, wherein the three are mixed with water.
  2. 2. A polyglycerol-containing complex thermodynamic inhibitor according to claim 1, wherein the molar percentages of sorbitol, polyglycerol and glycerol are respectively 1mol% sorbitol, 5mol% polyglycerol and 30mol% glycerol.
  3. 3. A polyglycerol-containing complex thermodynamic inhibitor according to claim 1, wherein the molar percentages of sorbitol, polyglycerol and glycerol are respectively 1mol% sorbitol, 5mol% polyglycerol and 0 to 40mol% glycerol.
  4. 4. A polyglycerol-containing complex thermodynamic inhibitor according to claim 1, wherein the molar percentages of sorbitol, polyglycerol and glycerol are respectively 1mol% sorbitol, 10mol% polyglycerol and 40mol% glycerol.
  5. 5. A polyglycerol-containing complex thermodynamic inhibitor according to claim 1, wherein the molar percentages of sorbitol, polyglycerol and glycerol are 3mol% sorbitol, 5mol% polyglycerol and 40mol% glycerol, respectively.
  6. 6. The application of the compound hydrate thermodynamic inhibitor containing polyglycerol is characterized by comprising the following steps, S1, uniformly mixing 1-3mol% of sorbitol, 5-10mol% of polyglycerol and 0-50mol% of glycerol with water according to the mol% to prepare corresponding inhibitors; s2, delivering the inhibitor configured in the step S1 of the part into the methane delivery pipeline; s3, pressing the methane conveying pipeline to enable the pressure to be 3-5 Mpa, and maintaining the pressure for 30min after the pressure reaches the set pressure; S4, observing the change of the pressure and the temperature in the methane conveying pipeline, and when the pressure and the temperature are kept unchanged, considering that the hydrate is completely generated, and continuously adding the rest inhibitor into the methane conveying pipeline at the moment; S5, opening an exhaust valve on a methane conveying pipeline, controlling the exhaust speed, and reducing the pressure by 0.01 Mpa in 5-7 seconds, and recording the temperature and pressure values of the hydrate in the decomposition process through a pipeline detection device; s6, repeating the steps S2-S6 after the pressure and the temperature are kept unchanged again.
  7. 7. The method of claim 6, wherein the SRK equation of state is used to calculate the amount of methane consumed to reflect the inhibition effect, and the formula is as follows: ; Wherein Deltan is the amount of methane consumed in the formation of the hydrate, n 0 and n t are the number of moles of methane gas at 0 min and T min, respectively, V 0 and V t represent the gas phase volumes at 0 min and T min, respectively, T and P are the equilibrium temperature and pressure, z is the compression coefficient of methane gas, and R is the universal gas constant.
  8. 8. The method of using a complex hydrate thermodynamic inhibitor comprising polyglycerol according to claim 6, wherein the conditions of GLHE of methane hydrate in the presence of polyglycerol are predicted by using a Chen-Guo thermodynamic model and a Wilson activity coefficient model, and the regression result of Wilson binary interaction parameters of polyglycerol and water is: 。

Description

Polyglycerol-containing compound hydrate thermodynamic inhibitor and application thereof Technical Field The application relates to a hydrate inhibitor and application thereof, in particular to a compound hydrate thermodynamic inhibitor containing polyglycerol and application thereof. Background When methane is transported by a transport pipeline, hydrate is generated, the generation process is represented as a guest molecule entering water molecules on a molecular level, a cage structure is formed under the action of hydrogen bonds, and a similar ice substance is formed macroscopically, wherein common guest molecules include carbon dioxide, methane and the like. In a low-temperature and high-pressure environment, the hydrate is extremely easy to generate, and in order to prevent the formation and blockage of the natural gas hydrate in the pipeline from bringing safety risks and economic losses to the production and transportation system, the hydrate needs to be subjected to inhibition treatment. Currently, the water-repellent compounds for pipes are mainly heated, decompressed, dehydrated and chemically treated. Where chemical methods typically use chemicals to inhibit hydrate formation or slow hydrate polymerization, they do not interfere with the normal flow of the pipe in use. The injection of thermodynamic inhibitors such as methanol and monoethylene glycol is the most mature and common method for preventing hydrate formation in pipelines by transferring the hydrate stability zone to high pressure and low temperature zones, but the thermodynamic inhibitors are used in large amounts, easily causing environmental pollution, and are generally used in amounts of about 20 to 60wt% (refer to papers ：Lim W V ,Metaxas J P ,Stanwix L P , et al.Gas hydrate formation probability and growth rate as a function of kinetic hydrate inhibitor (KHI) concentration[J].Chemical Engineering Journal,2020,388：124177-124177）. Treating the pipe hydrates by physical methods such as heating, depressurizing, etc., increases the risk of pipe breakage. Conventional hydrate-inhibiting chemicals include thermodynamic inhibitors (THIs), kinetic inhibitors (KHIs) and anti-Agglomeration Agents (AAs). Wherein THIs can transfer the hydrate stability zone to a high-pressure low-temperature zone to inhibit the formation of hydrate, thereby preventing the blockage caused by the hydrate in the pipeline. However, the use of conventional THIs in large amounts can adversely affect the environment. The concentration requirements of KHIs and AAs, although relatively low, are difficult to exert inhibitory effects under high pressure subcooling conditions. For the above reasons, it is necessary to study a compound thermodynamic inhibitor which combines the characteristics of environmental friendliness and high supercooling resistance. Disclosure of Invention The application aims to provide a polyglycerol-containing compound hydrate thermodynamic inhibitor which has the characteristics of environmental friendliness and high supercooling resistance, and on the basis of the aim, the application also aims to provide application of the polyglycerol-containing compound hydrate thermodynamic inhibitor. The application is realized in that the compound hydrate thermodynamic inhibitor containing polyglycerol comprises sorbitol, polyglycerol and glycerol, wherein the molar percentage of the sorbitol, the polyglycerol and the glycerol is 1-3mol percent, the polyglycerol is 5-10mol percent and the glycerol is 0-50mol percent after the three are mixed with water. Further, the mole percentages of sorbitol, polyglycerol and glycerol are 1 mole% of sorbitol, 5 mole% of polyglycerol and 30 mole% of glycerol, respectively. Further, the mole percentages of sorbitol, polyglycerol and glycerol are respectively 1 mole% of sorbitol, 5 mole% of polyglycerol and 0 to 40 mole% of glycerol. Further, the mole percentages of sorbitol, polyglycerol and glycerol are 1 mole% of sorbitol, 10 mole% of polyglycerol and 40 mole% of glycerol, respectively. Further, the mole percentages of sorbitol, polyglycerol and glycerol are 3 mole% of sorbitol, 5 mole% of polyglycerol and 40 mole% of glycerol, respectively. An application of a polyglycerol-containing compound hydrate thermodynamic inhibitor, comprising the following steps: s1, uniformly mixing 1-3mol% of sorbitol, 5-10mol% of polyglycerol and 0-50mol% of glycerol with water according to the mol% to prepare corresponding inhibitors; s2, delivering the inhibitor configured in the step S1 of the part into the methane delivery pipeline; s3, pressing the methane conveying pipeline to enable the pressure to be 3-5 Mpa, and maintaining the pressure for 30min after the pressure reaches the set pressure; S4, observing the change of the pressure and the temperature in the methane conveying pipeline, and when the pressure and the temperature are kept unchanged, considering that the hydrate is completely generated, and continuously adding the re