Toho Gas has filed a patent for a carbon dioxide recovery device that separates carbon dioxide from gas and sublimates it using a refrigerant. The device includes a separation device and a carbon dioxide sublimator connected in series, with the sublimator connected to a refrigerant circuit. The sublimator is depressurized to draw in the separated carbon dioxide. GlobalData’s report on Toho Gas gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Toho Gas, pervoskite solid electrolytes was a key innovation area identified from patents. Toho Gas's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Carbon dioxide recovery device with separation and sublimation capabilities
A recently filed patent (Publication Number: US20230149852A1) describes a carbon dioxide recovery device that aims to separate carbon dioxide from a gas mixture. The device consists of a separation device and a carbon dioxide sublimator connected in series. The separation device is responsible for separating the carbon dioxide from the gas mixture, while the carbon dioxide sublimator solidifies the separated carbon dioxide using a refrigerant. During the sublimation process, the carbon dioxide sublimator operates under negative pressure to facilitate the suction of the separated carbon dioxide.
The separation device in the carbon dioxide recovery device includes an absorption tower and a regeneration tower. The absorption tower brings the gas mixture into contact with an absorbing liquid to absorb the carbon dioxide, while the regeneration tower emits the carbon dioxide and water vapor from the absorbing liquid. The regeneration tower is connected in series with a water vapor condenser and a carbon dioxide sublimator. Both the water vapor condenser and the carbon dioxide sublimator are connected to a refrigerant circuit that uses a cold fluid as a refrigerant. The refrigerant condenses the water vapor and sublimates the carbon dioxide. Similar to the previous claim, the water vapor condenser and the carbon dioxide sublimator operate under negative pressure to facilitate the suction of the emitted water vapor and carbon dioxide.
The patent also describes the configuration of the refrigerant circuit, which is connected to the carbon dioxide sublimator, the water vapor condenser, and the absorption tower. The refrigerant flows through these components in the mentioned order. Additionally, the regeneration tower can be connected in parallel with multiple carbon dioxide recovery lines, each consisting of a water vapor condenser and a carbon dioxide sublimator. This parallel configuration allows for increased efficiency in the recovery process.
The carbon dioxide recovery device can be used in various applications, such as recovering carbon dioxide from combustion exhaust gases in iron manufacturing plants, cement plants, and power plants. The carbon dioxide sublimator is cooled down by the refrigerant to different temperatures depending on the application, ranging from minus 85 degrees centigrade to minus 140 degrees centigrade. The patent also describes the use of a heating medium in the carbon dioxide sublimator to liquefy and recover carbon dioxide. The heating process is controlled based on temperature and pressure conditions inside the sublimator.
Overall, this patent presents a carbon dioxide recovery device that utilizes a separation device and a carbon dioxide sublimator connected in series to efficiently separate and solidify carbon dioxide from a gas mixture. The device can be applied in various industries to recover carbon dioxide from different sources.
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