Method for producing improved food-grade liquid carbon dioxide product

Abstract

The invention discloses a method for producing an improved food-grade liquid carbon dioxide product. The method comprises the following steps of 1, a first compression process, 2, a dealkylation process, 3, a purification process, 4, a second compression process, 5, a liquefaction process, 6, a distillation purification process and 7, a refrigeration process. The method for producing the improved food-grade liquid carbon dioxide product realizes full utilization of the energy of carbon dioxide gas in high-pressure flash steam at the top of a product liquid carbon dioxide storage tank, saves a large amount of power, and reduces production energy consumption and a production cost.

Description

technical field [0001] The present invention generally relates to a production method of carbon dioxide, in particular to a production method of a food-grade liquid carbon dioxide product. Background technique [0002] figure 2 Show a kind of production method of food-grade liquid carbon dioxide product, comprise the steps: [0003] (1) The first compression process 30 [0004] The carbon dioxide raw material gas containing mechanical water, methane, ethylene, benzene and other impurities with a carbon dioxide content of about 99.2% from outside the boundary area is washed with water, and the chemical reaction that is mediated by the regulating valve 2 controlled by the orifice flowmeter 1 is slightly adjusted. The excess oxygen is mixed and enters the pre-cooler 10 for pre-cooling. After the mechanical water is removed by the first water separator 20, it enters the first compression process 30. The pressure is raised to 0.1-0.35MPa by the first-stage compressor 31 and the...

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Problems solved by technology

[0031] exist figure 2 In the production method of the food-grade liquid carbon dioxide product shown, the top of the product liquid carbon dioxide storage tank 112 is equipped with a gas phase discharge valve, and after the high-pressure flash gas passes through the gas phase discharge valve, it is connected with the heat exchanger on the upper part of the purification tower 101 from the distillation purification process 100. 1012 The gas mixture from the shell side is depressurized to 0.05MPa again through the regulating valve 1014 and then merged together to form a confluent airflow. A part of the confluent airflow is vented to the atmosphere after heating the adsorbent in the step ③ heating and desorbing impurities in the purification process as described above , the other part is vented to the atmosphere after cooling the adsorbent in the ④ cooling adsorbent step of the purification process, so that the kinetic energy of the high-pressure flash gas at the top of the product liquid carbon dioxide storage tank 112 is completely wasted, which does not meet the requirements of energy saving and consumption reduction

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