A kind of gas hydrate promoter and preparation method thereof

Abstract

The invention belongs to the technical field of gas hydrate production and utilization, and in particular relates to a gas hydrate accelerator and a preparation method thereof. The gas hydrate accelerator is made by mixing coconut oil fatty acid diethanolamide, polyoxyethylene ether sulfate, and polyquaternium salt as additives with deionized water at 72-83°C for 120 minutes; the coconut oil fatty acid Diethanolamide accounts for 1-2.5% by mass of the solvent; polyoxyethylene ether sulfate accounts for 9-16% by mass of the solvent; polyquaternium salt accounts for 0.2-0.5% by mass of the solvent %, and the rest is deionized water. The gas hydrate promoter of the invention has the advantages of good hydrate formation promoting effect, wide application, low cost and good economic benefits.

Description

technical field [0001] The invention relates to the technical field of gas hydrate production and utilization, in particular to a preparation method of a composite accelerator for accelerating the formation of gas hydrate. Background technique [0002] Natural gas hydrate is a non-stoichiometric cage-type crystalline compound formed by the interaction of natural gas and water under the thermal conditions of low temperature and high pressure. Its main water molecules are connected by hydrogen bonds to form a series of polyhedral cavities. When these cavities are filled by gas molecules, they have thermodynamic stability. The corresponding gas and latent heat energy are stored in the hydrate crystals. It is precisely because of these properties of hydrates that people propose to apply hydrate methods to various aspects such as gas storage and transportation, sewage treatment, seawater desalination, gas separation, solution concentration, and heat storage. [0003] However, t...

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Problems solved by technology

[0003] However, the gas hydrate technology is affected by factors such as harsh formation conditions, long induction time, slow formation rate, and low gas content, which seriously hinder the application of this technology, and adding accelerators is an effective solution

However, the research on gas hydrate accelerators in my country started relatively late, and the key problem to be solved in the current hydrate application technology is how to increase the rate of hydrate formation, and efficient accelerators are the most effective way to increase the rate of hydrate formation. my country's hydrate accelerator is still in the experimental research stage, and there is a big gap from industrial application

In the past few years, many scholars have participated in the research of hydrate accelerators, and they found that the existing accelerators all affect the hydrate formation rate to varying degrees, but the effect is not ideal

At the same time, most of the accelerators are soluble in water, and the waste liquid may pollute the water body of the environment. Therefore, finding an efficient and pollution-free accelerator is the key to the successful application of the gas hydrate method.

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