Method for promoting rapid generation of methane hydrate by using carbon nanotube composite hydrogel

A carbon nanotube composite and methane hydrate technology, which is applied in the fields of carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of restricting the rapid progress of hydrogen hydrate reaction, achieve good recycling performance, and improve heat transfer rate. , Principle scientific and reliable effect

Inactive Publication Date: 2021-04-09
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similar to methane, hydrogen is also a gas that is insoluble in water, which greatly limits the rapid progress of the hydrogen hydrate reaction

Method used

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  • Method for promoting rapid generation of methane hydrate by using carbon nanotube composite hydrogel
  • Method for promoting rapid generation of methane hydrate by using carbon nanotube composite hydrogel
  • Method for promoting rapid generation of methane hydrate by using carbon nanotube composite hydrogel

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The process of the method for the carbon nanotube composite hydrogel to promote the rapid generation of methane hydrate involved in this embodiment includes three steps: carbon nanotube composite hydrogel, processing carbon nanotube composite hydrogel and generating methane hydrate:

[0026] (1) Preparation of carbon nanotube composite hydrogel:

[0027] Dissolve 8.77g of acrylic acid in 20ml of deionized water, stir until dissolved, and prepare an aqueous solution of acrylic acid; dissolve 3.9g of sodium hydroxide in 20ml of deionized water, stir, and prepare an aqueous solution of sodium hydroxide; Mix and carry out neutralization reaction to obtain a mixed solution with a neutralization degree of 80%;

[0028] Slowly pour the mixed solution into a three-necked flask, place the three-necked flask in an oil bath, raise the temperature to 90°C and keep it there, place a magnetic stirrer on the top, keep the speed at 300rmp, and stir for 5-10min;

[0029] Add 8.77g of a...

Embodiment 2

[0038] In this example, the carbon nanotube composite hydrogel prepared in step (1) of Example 1 is subjected to a water absorption swelling test, and the appearance of the carbon nanotube composite hydrogel after absorbing water is as follows: figure 1 As shown, after testing, the water-absorbing-swelling ratio is 132 times.

Embodiment 3

[0040] In this example, the carbon nanotube composite hydrogel particles prepared in step (2) of Example 1 were observed by a scanning electron microscope: 0.1 g of carbon nanotube composite hydrogel particles were placed in 10 g of distilled water to make the carbon nanotube composite hydrogel particles The gel particles fully absorb water until no free-flowing water can be observed. At this time, the water content of the carbon nanotube composite hydrogel particles is 99.01%. Put them in a refrigerator at -6°C for 12 hours, and take out the frozen carbon nanotube composite hydrogel particles. Glue particles, put them into a freeze dryer, and vacuum freeze-dry them for 24-48 hours at a cold trap temperature of -56°C; spray gold on the freeze-dried carbon nanotube composite hydrogel particles, and then observe them with a scanning electron microscope , the captured pictures are as figure 2 As shown, the carbon nanotube composite hydrogel particles after water absorption and f...

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Abstract

The invention belongs to the technical field of hydrate preparation, and relates to a method for promoting rapid generation of methane hydrate by using carbon nanotube composite hydrogel, which comprises the steps of preparing the carbon nanotube composite hydrogel and generating the methane hydrate. The carbon nanotubes are fixed in a macromolecular three-dimensional network structure of the hydrogel in a relatively dispersed state, so that the phenomena of easy caking and poor dispersity in a liquid phase environment are avoided, the excellent heat-conducting property of the carbon nanotube monomer is brought into full play, and the heat transfer rate of a methane hydrate reaction system is increased; meanwhile, the hydrogel particles absorbing water are small in particle size and large in specific surface area, the contact area of methane gas molecules and water molecules is greatly increased, and compared with a traditional liquid medium, the gas mass transfer rate is greatly increased; and the principle is scientific and reliable, the morphological structure of the carbon nanotube composite hydrogel is not easy to damage in the generation and decomposition process of the methane hydrate, and the carbon nanotube composite hydrogel is easy to reuse and good in cyclic utilization performance.

Description

Technical field: [0001] The invention belongs to the technical field of hydrate preparation, and in particular relates to a method for promoting the rapid formation of methane hydrate by carbon nanotube composite hydrogel, which realizes the rapid formation of methane hydrate by increasing the mass transfer and heat transfer rates of a reaction system. Background technique: [0002] Methane hydrate, also known as "combustible ice", is an ice-like cage crystal compound formed by water molecules and methane molecules under high pressure and low temperature conditions. Water molecules are the main molecules, which are connected by hydrogen bonds to form a cage-type main structure, and methane molecules are guest molecules, which are filled in the cage structure by van der Waals force. The gas storage ratio of methane hydrate is high. Under standard conditions, one volume of hydrate can theoretically store 172 times the volume of methane gas. It has great application potential ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10C01B32/168
CPCC10L3/108C01B32/168
Inventor 王飞宋副彭孙梦婷何燕
Owner QINGDAO UNIV OF SCI & TECH
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