A device and production method for producing ultra-high-purity carbon dioxide by heat pump rectification

Abstract

The invention relates to a device and a method for producing ultra-pure carbon dioxide by heat pump distillation. The device comprises a feed solution storage tank which is connected with a first feed gas inlet through a first throttling valve group and an evaporator, a top gas-phase outlet of a first rectifying tower is connected with a first tee joint through a first feed gas inlet and a first feed gas outlet of a second heat exchanger, a heat pump, and a tube pass of a third heat exchanger, a second end of the first tee joint is connected with an inlet of a second reboiler through a third feed gas inlet and a third feed gas outlet of the second heat exchanger, an outlet of the second reboiler is connected with a first feed gas inlet of a second rectifying tower, and a bottom liquid-phase outlet of the second rectifying tower is connected with a product storage tank through a product inlet and a product outlet of a fourth heat exchanger. The device has the advantages of good simplicity of technological process, good simplicity and convenience in operation, good operational stability, low comprehensive energy consumption and capability of obtaining the liquid-phase carbon dioxide with the purity up to 99.99999% and above.

Description

technical field [0001] The invention belongs to the technical field of producing ultra-high-purity carbon dioxide, and in particular relates to a device and a production method for producing ultra-high-purity carbon dioxide by heat pump rectification. Background technique [0002] Carbon dioxide is not only a basic chemical raw material with a wide range of sources, cheap and easy to obtain, but also an environmentally friendly product that can be recycled. It has good economic benefits and great significance for environmental protection to achieve low-carbon emission reduction. As a valuable available resource, it has been widely used in food industry, mechanical processing, petroleum exploration, chemical industry and other fields. Especially food carbon dioxide is used to produce carbonated beverages and beer, especially high-purity carbon dioxide is used together with high-purity helium and high-purity nitrogen as laser gas for laser cutting machines, and high-purity car...

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Problems solved by technology

These methods have their own advantages and disadvantages in specific use. The low-temperature separation method has high cost due to its huge equipment, high energy consumption and poor separation effect, and is generally seldom used; the membrane separation method has the advantages of simple device, long life, convenient operation, technical Advanced, high efficiency, low energy consumption, economical and reasonable, etc., but the disadvantage of membrane separation method is that it is difficult to obtain high-purity carbon dioxide. In order to obtain high-purity carbon dioxide, it must be combined with solution absorption method

The former is used for rough separation and the latter for fine separation, but its process is extremely complicated; pressure swing adsorption has low energy consumption and strong adaptability, but it also has the disadvantage that it is difficult to obtain high-purity carbon dioxide, and the process is complicated

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