Nitrogen cycle refrigeration carbon monoxide cryogenic separation device and technology

Abstract

The invention discloses a nitrogen cycle refrigeration carbon monoxide cryogenic separation device and technology, and belongs to the field of deep freeze refrigeration plants. The device mainly comprises a nitrogen compressor system and a cold box separating unit; the nitrogen compressor system adopts three stages of compressors and is used for providing cold to the overall cold box separating unit; and a main body of the cold box separating unit is a cold box, and the cold box is internally provided with a plate-fin heat exchanger, a demethanizer condenser, a demethanizer reboiler, a gas-liquid separation tank, a hydrogen-rich gas flash tank, a stripping tower, a denitrification tower and a demethanizer. By means of the cryogenic separation device, CO product gas, fuel gas, flash steam and hydrogen-rich gas can be extracted from raw material gas purified by a molecular sieve adsorption system, and therefore efficient separation of components is achieved. According to the device and technology, a single cycle nitrogen refrigerating system is adopted for providing the cold to the overall device. In the overall device, according to the optimizing condition of the heat exchange network, the pressure of nitrogen entering the compressors can be divided into two or three stages, and the energy consumption for cryogenic separation is reduced.

Description

technical field [0001] The invention belongs to the field of cryogenic equipment, in particular to a device and a process for cryogenic separation of carbon monoxide gas by nitrogen cycle refrigeration. Background technique [0002] Carbon monoxide (CO) and hydrogen (H 2 ) is an important basic chemical raw material, widely used in chemical processes such as oxo synthesis, such as methanol carbonylation to produce acetic acid, acetic anhydride, formic acid, oxalic acid and dimethylformamide, as well as phosgene synthesis, production of polycarbonate, polyurethane, Synthesis of metal carbonyl compounds, etc. Current CO and H 2 Separation mainly includes cryogenic method, absorption method and pressure swing adsorption method. Among them, the cryogenic separation method is suitable for large-scale industrial production, which can effectively obtain high-purity CO, and the separation effect is very ideal. The core of the cryogenic separation method is to use the difference ...

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Problems solved by technology

The disadvantage of this method is that it separates CO and H 2 The process is more complicated, and the energy consumption is higher

The utility model patent with the application number CN201120212483.3 also discloses a device for cryogenically separating carbon monoxide and hydrogen. The method and equipment for the mixture, the invention patent application number CN200480030835.6 discloses a method and equipment for the production of carbon monoxide and / or hydrogen and / or a mixture of hydrogen and carbon monoxide by low-temperature distillation, but these equipment are also more or less in use. There are few defects in process and energy consumption, which need to be further improved

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