A preparation device for producing high-quality liquid carbon dioxide and its preparation process

Abstract

The invention discloses a preparation device for producing high-quality liquid carbon dioxide. The preparation device comprises a drying system, a heavy component removing system, an impurity removingsystem and a light component removing system; a rotating wheel dehumidifying machine comprises a dehumidifying region and a regeneration region; a smoke cooler, a heater and the regeneration region are communicated through a regenerated gas pipeline; the dehumidifying region is communicated with a compressor through a raw gas pipeline; the compressor is communicated with the heater through the raw gas pipeline; the heavy component removing system comprises a heavy component removing tower, a heavy component removing circulating pump and a CO2 washing pump; a preparation technology comprises the following steps: (1) drying and dehydrating; (2) washing and removing a heavy component; (3) carrying out low-temperature deep impurity removal; (4) carrying out liquefaction and rectification. Thepreparation device and the preparation technology, disclosed by the invention, have the advantages of simple technology, low operation energy consumption and convenience for operation; under the condition that a few of sets of equipment need to be increased based on previous process equipment, and the liquid carbon dioxide with the content more than 99.995 percent can be stably produced; the generation of solid wastes is reduced and the investment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical product preparation, and in particular relates to a preparation device for producing high-quality liquid carbon dioxide and a preparation process thereof. Background technique [0002] Carbon dioxide is widely used in chemical industry, machinery, food, agriculture, medicine, tobacco, fire protection and other industries. It not only has a wide range of uses, but also its demand is increasing day by day. [0003] Most of the liquid carbon dioxide currently on the market uses crude desulfurization and fine desulfurization systems to remove sulfur-containing impurities, but the product quality is not stable, and the finished liquid carbon dioxide contains too many hydrocarbon impurities. 2 It is difficult to ensure that the content of CO exceeds 99.995%. The one-tower rectification process adopted in the prior art can only remove low boiling point and light component impurities, but cannot deeply r...

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Problems solved by technology

[0003] Most of the liquid carbon dioxide currently on the market uses crude desulfurization and fine desulfurization systems to remove sulfur-containing impurities, but the product quality is not stable, and the finished liquid carbon dioxide contains too many hydrocarbon impurities. 2 It is difficult to ensure that the content of CO exceeds 99.995%. The one-tower rectification process adopted in the prior art can only remove low boiling point and light component impurities, but cannot deeply remove the boiling point ratio CO 2 High impurities; and the use of normal temperature adsorption desulfurization cannot ensure the removal efficiency, and a small amount of impurities such as moisture and sulfur will remain in the product to affect product quality; adsorption desulfurization will produce a large amount of saturated adsorbent solid waste, which will cause secondary pollution to the air; In the normal temperature molecular sieve adsorption and dehydration process used in the prior art, it is necessary to use steam or electric heating to regenerate the molecular sieve, which has high energy consumption, high equipment investment, and high moisture content in the product; the piston compressor used, every 2- It takes 3 months to replace and clean vulnerable items such as piston rings, the continuous operation time is short, and the operating cost is high

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