Method and device for recycling reaction offgas generated during vinyl acetate synthesis through biomass ethylene method

Abstract

The invention relates to a method and a device for recycling reaction offgas generated by vinyl acetate synthesis through a biomass ethylene method. The method is characterized in that an ethylene recycling packed tower is arranged, a recycling gas from a reaction absorption tower for synthesizing vinyl acetate through the biomass ethylene method is filled from the lower part of the ethylene recycling packed tower and rises in the ethylene recycling packed tower; an acetic acid pump is utilized to pump acetic acid which is served as an absorbent through a middle acetic acid inlet in the ethylene recycling packed tower, and acetic acid is distributed on the packing surface of the ethylene recycling packed tower in a flowing manner; and the ethylene dissolved in acetic acid and acetic acid are discharged through a bottom outlet in the ethylene recycling packed tower together, and the undissolved ethylene is discharged through a top outlet in the ethylene recycling packed tower. The reaction offgas of vinyl acetate synthesizing is comprehensively recycled and utilized, so that the utilization ratio of raw materials is increased, the unit consumption of the raw materials and energy sources are lowered, and offgas emission and environmental pollution can be greatly reduced.

Description

technical field [0001] The invention relates to a method and a device for recovering reaction tail gas of vinyl acetate synthesized by biomass ethylene method. Background technique [0002] At present in my country, in the production process of vinyl acetate synthesized by petrochemical ethylene method, part of the gas needs to be extracted continuously and directly discharged to the torch for combustion. The reason for this is that the cyclic reaction produces a small amount of carbon monoxide gas, which can poison the catalyst. Therefore, it is necessary to extract a certain amount of gas for combustion according to the analysis index, so as to maintain the relative stability of the reaction gas components, control the by-products such as carbon monoxide within an appropriate range, and ensure the normal production. According to the process design control requirements, normal production needs to extract 70Nm from the circulating synthesis reaction gas of the device 3 / h ...

AI Technical Summary

Problems solved by technology

According to the process design control requirements, normal production needs to extract 70Nm from the circulating synthesis reaction gas of the device 3 / h of recovered gas, in this part of the discharged gas, the ethylene content is about 94%, and the other 6% is mainly CO, CO 2 , N 2 Etc. This way makes the amount of combustion treatment very large, which not only increases the amount of three wastes treatment, but also brings adverse effects on the environment.

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