Processing technique of liquid carbon dioxide by decarbonizing and resolving synthetic ammonia

Abstract

The invention discloses a processing technique of liquid carbon dioxide by decarbonizing and resolving synthetic ammonia, relating to the technical field of synthetic ammonia production and processing. The technique comprises the following steps: desulfurization, drying and dewatering, condensation, purification, dealkylation and rectification purification. According to the technique disclosed by the invention, the liquid carbon dioxide recovery integrates the characteristics of carbon dioxide low-pressure deep freezing and rectification; and a medium-pressure process is utilized to produce the liquid carbon dioxide and separate the impurities with lower boiling point than the carbon dioxide, and impurities which have higher boiling point than the carbon dioxide and can not be separated by rectification are specifically removed. The synthetic ammonia PSA decarbonization CO2-containing bleed air is recovered to prepare the high-purity liquid industrial-grade carbon dioxide and liquid food-grade carbon dioxide, thereby reducing the emission of greenhouse gases, enhancing the productivity of industrial gases of the local area, greatly lowering the energy consumption and cost of the synthetic ammonia product, and enhancing the economic benefits of the enterprises and the environmental protection of the local area.

Description

technical field [0001] The invention relates to the technical field of synthetic ammonia production and processing, in particular to a processing technology for decarburization and analysis of liquid carbon dioxide in synthetic ammonia. Background technique [0002] The raw material gas purification and decarbonization of ammonia synthesis enterprises all adopt pressure swing adsorption (PSA) decarbonization technology, and the decarbonized gas contains about 86% CO 2 The gas is directly vented, which has a certain impact on the environment. Although carbon dioxide is the chief culprit of the atmospheric greenhouse effect that warms the earth's climate, liquid carbon dioxide has a wide range of uses in fields such as machinery manufacturing, beverages, food, and oil field flooding. Tens of millions of tons of carbon dioxide for industrial use. At present, the total amount of liquid carbon in the country does not exceed 3 million tons per year, and the oil industry needs li...

AI Technical Summary

Problems solved by technology

(1) Due to the high pressure, many purification equipment are not used due to the difficulty of production and high production cost. Impurities are dissolved in the product due to high pressure, resulting in low product quality and can only be used in general industries.

(2) Pressure swing adsorption method When the purity and impurity content fluctuate greatly, the product concentration is difficult to meet the requirements, and it is difficult to ensure product quality stability for a long time, especially for the trace and ultra-trace specified in the international beverage carbon dioxide standard and the food grade carbon dioxide national standard The amount of impurity indicators cannot be guaranteed to be stable, and the products of this method can only be used as industrial products

(3) In the actual production of shallow low-temperature adsorption distillation method, due to the different adsorption capacity of different adsorbents for different impurities and the different content of impurities in the feed gas, it is difficult to ensure that multiple adsorbents penetrate and fail at the same time. Several adsorbents have penetrated and failed, while other adsorbents have not yet failed, so it is difficult to ensure that multiple impurities in the raw gas are qualified at the same time. Like pressure swing adsorption, trace and Ultra-trace impurity indicators cannot be guaranteed to be stable

Images