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Compound hydrate additive and application thereof in separation and enrichment of mixed gas

A hydrate and composite technology, applied in gas treatment, carbon compounds, separation methods, etc., can solve the problems of low gas storage, high production cost, environmental hazards, etc., and achieve simple separation and purification methods, fast separation speed, and energy efficiency. The effect of low consumption

Active Publication Date: 2017-05-17
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

However, in the current separation process, the kinetics of hydrate formation is insufficient, and the gas storage capacity is relatively low, which seriously affects the industrialization process of the application of hydrate separation technology.
[0003] Introducing porous media such as silica gel, activated carbon, and graphene into the hydrate system can improve the kinetics of hydrate formation and increase the gas storage capacity of hydrate to a certain extent. However, these methods have high production costs and are relatively difficult to recycle.
In contrast, kinetic accelerators have received widespread attention due to their small amount of high-efficiency characteristics. As a representative of kinetic accelerators, sodium dodecyl sulfate (SDS) plays an important role in improving hydrate formation kinetics and gas storage capacity. However, SDS, like most surfactants, comes from petrochemical by-products, which is harmful to the environment, and produces a large number of air bubbles during use, causing certain problems for the industrialization of hydrate technology. It is particularly necessary to develop a new type of green and environment-friendly hydrate kinetic accelerator to solve the technical problems faced by the current hydrate separation technology
In the previous study, we proposed that amino acid, as an efficient hydrate accelerator, showed great application prospects in the preparation of gas hydrates with high gas storage density. However, for mixed gas components, its single-component separation effect is not Ideally, the present invention proposes the concept of a composite hydrate additive, which introduces auxiliary additives into the amino acid kinetic accelerator, which greatly promotes the application and promotion of hydrate technology in the field of separation and enrichment of mixed gases

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  • Compound hydrate additive and application thereof in separation and enrichment of mixed gas
  • Compound hydrate additive and application thereof in separation and enrichment of mixed gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, a composite additive with a mass fraction of 0.2% tryptophan and 0.5% THF was used as the hydration accelerator.

[0029] 1) Uniformly mix 0.2g tryptophan, 0.5g THF and 99.3g water to obtain a composite additive aqueous solution with a mass fraction of 0.7%, that is, a composite hydrate accelerator;

[0030] 2) Add 100 g of the above aqueous solution to the autoclave (500 mL effective volume);

[0031] 3) At a temperature of 273K, filling the autoclave with a mixed gas with a pressure of 7 MPa (volume fraction of 60% CO 2 , with a volume fraction of 40% N 2 ), calculate the CO in the mixed gas at a certain time interval by the change of the pressure in the reactor 2 The content changes, the results are shown in Table 1;

[0032] 4) Under normal temperature and pressure, the gas hydrate naturally decomposes to obtain high-purity CO 2 gas.

Embodiment 2

[0034] In this example, a composite additive of 0.5% tryptophan and 1% THF was used as the hydration accelerator.

[0035] 1) Uniformly mix 0.5g tryptophan, 1g THF and 98.5g water to obtain a composite additive aqueous solution with a mass fraction of 1.5%, that is, a composite hydrate accelerator;

[0036] 2) Add 100 g of the above aqueous solution to the autoclave (500 mL effective volume);

[0037] 3) at a temperature of 273K, filling the autoclave with a pressure of 5 MPa mixed gas (35% CH 4 , 65% CO 2 ), calculate the CO in the mixed gas at a certain time interval by the change of the pressure in the reactor 2 The content changes, the results are shown in Table 1;

[0038] 4) Under normal temperature and pressure, the gas hydrate naturally decomposes to obtain high-purity CO 2 gas.

[0039] Each gas (CH) in the mixed gas in this embodiment 4 and CO 2 ) hydrate phase equilibrium curve such as figure 1 shown.

Embodiment 3

[0041] In this example, a composite additive with a mass fraction of 0.1% tryptophan and 0.4% TiAAB was used as a hydrate accelerator.

[0042] 1) Uniformly mix 0.1g tryptophan, 0.4g TiAAB and 99.5g water to obtain a composite additive aqueous solution with a mass fraction of 0.5%, that is, a composite hydrate accelerator;

[0043] 2) Add 100 g of the above aqueous solution to the autoclave (500 mL effective volume);

[0044] 3) At a temperature of 274K, filling the autoclave with a pressure of 7 MPa mixed gas (40% CO 2 , 60%N 2 ), calculate the CO in the mixed gas at a certain time interval by the change of the pressure in the reactor 2 The content changes, the results are shown in Table 1;

[0045] 4) Under normal temperature and pressure, the gas hydrate naturally decomposes to obtain high-purity CO 2 gas.

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Abstract

The invention belongs to the technical field of gas separation and discloses a compound hydrate additive and an application thereof in separation and enrichment of mixed gas. The compound hydrate additive is prepared from amino acid, a hydration enhancer and water, wherein the hydration enhancer is at least one of tetrahydrofuran, tetrabutylammonium bromide, cetyl trimethyl ammonium bromide, dodecyltrimethylammonium bromide, tetraisoamyl bromide or cyclopentane. The compound hydrate additive disclosed by the invention is used as an accelerant for hydrate, is capable of overcoming the defects of poor separating effect and low kinetic performance of a single kinetic accelerant in the separation and enrichment of the mixed gas, and is capable of more effectively separating and enriching a single component in the mixed gas; the separation and purification method is simple; the dosage of the additive is less; the energy consumption is low; and the separating speed is high.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and in particular relates to a compound additive and its application as a hydrate accelerator in the separation and enrichment of mixed gas. Background technique [0002] The current industrial development pays more and more attention to the concept of environmental protection and sustainable development. Energy graded treatment and waste recovery and reuse technology have attracted extensive attention from researchers. Recovery), refinery dry gas separation (ethylene and hydrogen recovery), ethylene cracking gas separation, flue gas filtration (carbon dioxide recovery), oxygenated coalbed methane purification and other mixed component purification and refining fields are playing an increasingly important role. Compared with the traditional low-temperature liquefaction, absorption, adsorption, combustion, membrane separation and other methods, the hydrate separation technology shows unique...

Claims

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Application Information

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IPC IPC(8): B01D53/74B01D53/62C01B32/50
CPCB01D53/62B01D53/74B01D2251/70B01D2256/10B01D2256/245B01D2257/504C01P2006/80
Inventor 蔡元浩李啟杰王卫星李亮王素莹
Owner SOUTH CHINA UNIV OF TECH
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