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Degradable hydrate generating accelerant and preparation method thereof

A technology of hydrate formation and accelerator, which is applied in the field of degradable hydrate formation accelerator and its preparation, can solve the problems of large environmental pollution and high cost, achieve good effect, promote foam generation, and reduce surface tension

Inactive Publication Date: 2015-09-30
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The problem that the present invention asks to be solved is: reclaim and separate CO in the prior art 2 High cost and great environmental pollution

Method used

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  • Degradable hydrate generating accelerant and preparation method thereof
  • Degradable hydrate generating accelerant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Configure a composite accelerator solution with a mass concentration of 0.03% rhamnolipid + 0.03% lignin + 0.015% sodium bicarbonate, inject 170 ml into the reaction kettle, set the temperature of the constant temperature water bath, the given initial temperature is 2.5 °C, and the experimental gas is 99.9% CO 2 Gas, inhale after the temperature is stable, turn on the stirrer in the kettle 10 minutes after the inflow is completed, the stirring speed is maintained at 1450r / min, and the reaction kettle is filled with hydrate for 180 minutes and the pressure is no longer reduced, which is shorter than the reaction time when there is no additive in the same system 21.8%, and the phase equilibrium pressure measured by constant temperature pressure search method is 2.45Mpa.

[0038] Specific steps are as follows:

[0039] Prepare the solution: Use an electronic balance with an accuracy of 0.001g to accurately weigh the reagents and configure the reaction solution of the corr...

Embodiment 2

[0045] A composite accelerator solution with a mass concentration of 0.05% rhamnolipid + 0.05% lignin + 0.02% sodium bicarbonate was prepared, 170 ml was injected into the reaction kettle, and the temperature of the constant temperature water bath was set. The given initial temperature was 2.5 °C, and the experimental gas was 99.9% CO 2 Gas, inhale after the temperature is stable, turn on the stirrer in the kettle 10 minutes after the gas intake is completed, the stirring speed is maintained at 1450r / min, and the reaction kettle is filled with hydrate for 170min and the pressure is no longer reduced, which is shorter than the reaction time when there is no additive in the same system 26.1%, using the constant temperature pressure search method, the phase equilibrium pressure is 2.4Mpa.

Embodiment 3

[0047] Configure a composite accelerator solution with a mass concentration of 0.07% rhamnolipid + 0.07% lignin + 0.025% sodium bicarbonate, inject 170 ml into the reaction kettle, set the temperature of the constant temperature water bath, the given initial temperature is 2.5 °C, and the experimental gas is 99.9% CO 2 Gas, inhale after the temperature is stable. After 10min of air intake, the stirring speed of the agitator in the kettle is maintained at 1450r / min. After 140min of reaction, the reaction kettle is filled with hydrate and the pressure is no longer reduced. The reaction time is shortened by 39.1% compared with the same system without additives. %, using the constant temperature pressure search method, the phase equilibrium pressure is 2.38Mpa.

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Abstract

The invention relates to the technical field of gas hydrate industrial production and intensified generation, particularly to a degradable hydrate generating accelerant and a preparation method thereof. The degradable hydrate generating accelerant is characterized in that the CO2 hydrate generating accelerant is obtained by compounding three materials of rhamnolipid, xylogen and sodium bicarbonate into a water solution according to proportion, wherein the concentrations of the rhamnolipid, xylogen and sodium bicarbonate are respectively 0.01-0.13%, 0.01-0.13% and 0.0125-0.03%. The degradable hydrate generating accelerant can be applied to hydrate generating acceleration, and can also be used for collecting greenhouse gas. Rhamnolipid and sodium lignin sulfonate are both environment-friendly agents, the surface tension on the gas-liquid interface can be obviously reduced, the resistance generated when the gas enters the liquid phase through the interface is reduced, foam generation is promoted, the gas-liquid contact area is enlarged, the hydrate generation induction time is greatly shortened, and the hydrate generation speed is increased. Compared with conventional accelerants, the degradable hydrate generating accelerant is less in dosage, pollution-free, economical and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of industrial production and enhanced generation of gas hydrate, in particular to a degradable hydrate generation accelerator and a preparation method thereof. Background technique [0002] Hydrate is a cage-like crystal structure, in which the water molecule as the host forms a cage lattice, and the guest molecules are wrapped in it; due to the difference in molecular weight, three different structures can be formed, namely type I, type II and Type H; CO 2 Hydrate is CO 2 An inclusion compound formed at a certain temperature and pressure, water molecules combine with each other by hydrogen bonds to form cage-shaped voids, CO 2 The molecule is enveloped, and a cage void can only accommodate at most one CO 2 molecule, CO 2 Molecules interact with water molecules by van der Waals force, which is the key to the structure formation and stable existence of hydrates; under standard temperature and air pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/20C01B32/50
Inventor 王树立刘墨夫饶永超康甜甜刘倩郑亚星代文杰戴源
Owner CHANGZHOU UNIV
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