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JP-7857142-B2 - Gas separator and method for manufacturing a gas separator

JP7857142B2JP 7857142 B2JP7857142 B2JP 7857142B2JP-7857142-B2

Inventors

  • 小宅 教文
  • 今川 晴雄
  • 山本 征治
  • 瀬戸山 徳彦
  • 永田 哲治

Assignees

  • 株式会社豊田中央研究所
  • 株式会社デンソー

Dates

Publication Date
20260512
Application Date
20220406

Claims (4)

  1. An adsorbent monolith having a monolithic structure and composed of a mixture containing an adsorbent that adsorbs a specific gas to be adsorbed and a binder, A container that houses the adsorbent monolith on the inside, A gas separator comprising the aforementioned mixture as its main component, an adhesive filled between the adsorbent monolith and the container, and bonding the adsorbent monolith and the container together.
  2. A gas separator according to claim 1, A gas separator in which the adsorbent content in the mixture within the adsorbent monolith is 80% or more by weight.
  3. A gas separator according to claim 2, A gas separator in which the adsorbent content in the mixture in the adhesive is 80% or more by weight.
  4. A method for manufacturing a gas separator, A preparation step of preparing an adsorbent monolith by forming a mixture containing an adsorbent that adsorbs a specific gas and a binder into a monolithic structure, A storage step of housing the adsorbent monolith inside the container, A method for manufacturing a gas separator, comprising: an bonding step of filling the space between the adsorbent monolith and the container with an adhesive mainly composed of the aforementioned mixture to bond the adsorbent monolith and the container together.

Description

This invention relates to a gas separator and a method for manufacturing a gas separator. Conventionally, a technique is known for recovering a specific adsorbent gas by adsorbing it onto an adsorbent material and then desorbing it from a mixed gas. Generally, from the viewpoint of adsorption and desorption efficiency, it is preferable to perform adsorption of the adsorbent gas at low temperatures and desorption of the adsorbent gas from the adsorbent material at high temperatures, with the temperature of the adsorbent material being regulated by heat exchange with the outside. Until now, adsorbents have often been used in the form of granules, with the granules being packed into a particle-filled structure. However, in a particle-filled structure, the thermal conductivity between granules is low because each granule is in point contact, resulting in low heat exchange efficiency between the adsorbent and the outside. Therefore, as a technology to improve the heat exchange efficiency between the adsorbent and the outside, Patent Document 1 discloses an adsorbent monolith in which the adsorbent is molded into a monolithic structure. Because the adsorbent monolith has a one-piece structure, the thermal conductivity within the adsorbent monolith is improved compared to a particle-filled structure. Patent Document 2 discloses a monolith adsorbent contactor, which is a container containing an adsorbent monolith. In Patent Document 2, the adsorbent monolith is bonded to the inner surface of the container via an adhesive mainly composed of polymer, enabling good heat exchange between the adsorbent monolith and the container. U.S. Patent Application Publication No. 2019/0083954Special table 2014-514137 publication This is an explanatory diagram illustrating the configuration of a gas separator as one embodiment of the present invention.This is an explanatory diagram showing the state in which the adsorbent monolith is inserted into the container.This is a flowchart showing an example of the manufacturing process for a gas separator.This is an explanatory diagram showing the arrangement of gas separators in an adsorption capacity evaluation test.This is an explanatory diagram showing the test results from an adsorption capacity evaluation test.This is an enlarged explanatory diagram showing a portion of the test results from an adsorption capacity evaluation test. <First Embodiment> Figure 1 is an explanatory diagram illustrating the configuration of a gas separator 1 as one embodiment of the present invention. The gas separator 1 is a device that recovers a specific adsorbent gas contained in a mixed gas by adsorbing it onto an adsorbent material and then desorbing it. In the gas separator 1, carbon dioxide ( CO2 ) is used as the specific adsorbent gas. The gas separator 1 comprises an adsorbent monolith 10, a container 20, and an adhesive 30. The adsorbent monolith 10 has a monolithic structure and is composed of a mixture containing an adsorbent that adsorbs CO2 , a specific gas to be adsorbed, and a binder. A monolithic structure is a one-piece porous structure in which a fine mesh-like framework is continuous in three dimensions. Figure 1 shows a plurality of holes P on one surface of the cylindrical adsorbent monolith 10, which allow the mixed gas to flow into the interior of the adsorbent monolith 10. The mixed gas that flows in through the holes P passes through the adsorbent monolith 10 while adsorbing CO2 onto the adsorbent in the adsorbent monolith 10. Examples of adsorbents included in the mixture that constitutes the adsorbent monolith 10 include metal-organic frameworks (MOFs), zeolites, silica, activated carbon, and covalent organic frameworks. In this embodiment, HKUST-1, one of the representative metal-organic frameworks, is used as the adsorbent included in the mixture. The adsorbent content in the mixture of the adsorbent monolith 10 is 80% or more by weight. Furthermore, examples of binders included in the mixture constituting the adsorbent monolith 10 include a binder mixture of inorganic binders (carbon fiber, graphite, boehmite, bentonite, sepiolite, etc.) and organic binders (methylcellulose, carboxymethylcellulose, hydroxypropylcellulose, hydroxyethylcellulose, polyvinyl alcohol, etc.). In this embodiment, a binder mixture of boehmite (an inorganic binder) and hydroxypropylcellulose (an organic binder) is used as the binder included in the mixture. Figure 2 is an explanatory diagram showing the state in which the adsorbent monolith 10 is inserted into the container 20 during the manufacturing process of the gas separator 1. The container 20 is a container that houses the adsorbent monolith 10 inside. As shown in Figure 2, the general shape of the container 20 is cylindrical. By inserting the cylindrical adsorbent monolith 10 into the inside of the cylindrical container 20, the container 20 houses the adsorbent monolith 10 inside. Returning to the explanation of Figure 1, the adhesive 30 mainl