CO2 hydrate formation promoter

A technology of hydrate formation and accelerator, which is applied in the direction of carbon compounds, reagents, educts, etc., can solve the problems of not many effective and practical ones, and achieve the effects of increasing the formation rate, reducing the pressure of hydrate formation, and increasing the dissolved amount

Active Publication Date: 2011-05-18
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Given the hydrate gas separation for CO 2 The importance of reducing emissions, using chemical additives to boost CO 2 There are more and more studies on hydrate formation, but there are not many effective and practical ones

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This implementation case is that in a reactor with a volume of 60ml, the flue gas (CO 2Concentration 17.0%, N 2 Concentration 83.0%) in CO 2 Hydrates were formed in 25 ml of mixed aqueous solution of tetra-n-butylammonium bromide (TBAB for short, molar concentration of 0.29%) and dodecyltrimethylammonium bromide (DTAB for short, molar concentration of 0.028%). At 1.8°C, under the condition of injected flue gas pressure of 2.53MPa, hydrates are formed at constant volume, and the time taken to form hydrates is 2 minutes, which is two-thirds shorter than that under the same conditions without adding accelerators; at the same time , the gas pressure in the gas phase is 2.18MPa after the generation is complete, CO 2 The amount dissolved in the solution increased by 30% compared with the presence of no promotion. This case shows that under the same conditions, the addition of accelerators can effectively increase the CO 2 The rate of hydrate formation and promote CO 2 Di...

Embodiment 2

[0033] This implementation case is that in a reactor with a volume of 60ml, the flue gas (CO 2 Molarity 17.0%, N 2 Molar concentration 83.0%) in CO 2 Hydrates were formed in 25 ml of mixed aqueous solution of tetra-n-butylammonium chloride (abbreviated as TBAC, with a molar concentration of 0.29%) and dodecyltrimethylammonium bromide (abbreviated as DTAB, with a molar concentration of 0.055%). At 1.8°C, under the condition of injected flue gas pressure of 1.63MPa, CO in the hydrate phase generated by accelerator 2 Compared with the CO in the hydrate phase formed without accelerator 2 The component content is 14.2% higher at 64.0%. This case shows that under the same conditions, the addition of accelerators can effectively increase the production of CO 2 s efficiency.

Embodiment 3

[0035] This implementation case is that in a reactor with a volume of 60ml, the flue gas (CO 2 Molarity 17.0%, N 2 Molar concentration 83.0%) in CO 2 Hydrates are formed in 25 ml of mixed aqueous solutions of tetra-n-octylammonium bromide (abbreviated as TOAB, with a molar concentration of 0.10%) and octadecyltrimethylammonium chloride (abbreviated as STAC, with a molar concentration of 0.014%). At 1.8°C and a pressure of 0.66MPa, gas hydrates are formed in the system with an accelerator, and the component concentration is 56.92%, while no hydrates are formed in the system without an accelerator. This case illustrates that at 1.8°C Under these conditions, the addition of accelerators can effectively reduce the pressure of hydrate formation.

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Abstract

The invention provides an environmental, economical and efficient CO2 hydrate formation promoter. The main additive and the auxiliary additive are dissolved in the water to form a mixed solution; the contents of the main additive and the auxiliary additive are separately 0.10-0.35% and 0.014-0.055% of the total amount of the mixed solution by molar percent and the allowance is water; the main additive is composed of one or more quaternary ammonium compounds with the general formula (I) and the auxiliary additive is composed of one or more quaternary ammonium compounds with the general formula(II). The CO2 hydrate formation promoter of the invention has the advantages that the dissolution of CO2 in aqueous solution can be effectively improved; the formation pressure of hydrate can be significantly reduced; the hydrate formation speed can be improved; the concentration of CO2 in hydrate phase decomposition gas can be increased; the promoter can be recycled; the process of separation has no pollution and the promoter is economic, environmental friendly, efficient and the like, thus being applicable to CO2 separation with low cost of various mixed gases such as flue gas, IGCC synthesis gas, natural gas and the like.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a CO 2 Hydrate formation accelerator. technical background [0002] The reality of global warming is constantly sounding the alarm to people all over the world, and greenhouse effect gases, especially CO 2 Gas emissions have become one of the hottest issues in the world. Atmospheric CO 2 The main source of the continuous increase in concentration is the exhaust gas emitted from large-scale energy production in industry. my country is a country where coal is the main energy source, and this energy structure will not change for a long time in the future. Most of my country's coal is used for power generation. At present, the traditional coal-fired thermal power generation will still play a dominant role in my country's power generation field for a long time. Coal-fired power plants CO 2 The emission is large and relatively concentrated, a...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01D53/14B01D53/62C01B31/20C01B32/50
CPCY02C10/06Y02C10/04Y02C20/40Y02P20/151
Inventor李小森徐纯刚陈朝阳李刚颜克凤
OwnerGUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI