Vinyl acetate production process and equipment

Abstract

The invention relates to a vinyl acetate production process and device. By setting a stabilization process, an acetic acid recovery system, a desorption system and a device, the composition of the circulating gas is changed, the explosion range is reduced, and the reactor inlet is increased under the same production load and the same catalyst conditions. The highest allowable oxygen volume fraction increases the safety of the production process and improves the conversion rate of the reaction per pass; at the same time, according to the actual production situation, the separation sequence of materials is reasonably cut. The present invention sets the pre-first gas separation tower to fully recover the heat of the reaction gas, reduces the energy consumption of the production process, and reduces the energy consumption of the whole production process; the acetic acid recovery system is set to provide the negative pressure environment of the acetic acid recovery tower through the vacuum unit, maximizing Recover acetic acid while avoiding the accumulation of heavy components at the bottom of the acetic acid evaporator to ensure the stability of production; design an ethylene recovery device for recovering lye in the desorption tower, and reuse the ethylene raw material in the recovered lye.

Description

technical field [0001] The invention belongs to the field of chemical reaction and separation, and relates to a process and a device for producing vinyl acetate, in particular to a production process and a device for synthesizing vinyl acetate by ethylene vapor phase method. Background technique [0002] Vinyl acetate (VAC), also known as vinyl acetate, has the molecular formula CH 3 COOCH=CH 2 , one of the organic chemical products with the largest output in the world, and also one of the 50 largest organic chemical products in the world. Vinyl acetate is a simple ester of saturated acid and unsaturated alcohol. Polyvinyl alcohol (PVA), vinyl acetate-ethylene copolymer (EVA), polyvinyl acetate (PVAC), acetic acid can be produced by self-polymerization or copolymerization with other monomers. Ethylene-vinyl chloride copolymer (EVC) and other polymers. These products have a wide range of uses, generally used in adhesives, paper or fabric sizing agents, paints, inks, leathe...

AI Technical Summary

Problems solved by technology

[0008] There is no acetic acid recovery system, resulting in the waste of acetic acid in the tower kettle of the acetic acid evaporator or the stickiness of heavy components, resulting in waste of raw materials and affecting the stability of actual production; the high-temperature reaction product gas coming out of the reactor passes through the low-temperature After the two-stage heat exchange of the reaction gas, the temperature is still high, and there is a lot of waste of heat energy; a large amount of water will be produced by-product in the ethylene gas phase method of vinyl acetate synthesis, and this part of water will be condensed by the second gas separation tower and brought to the rectification section for desorption. In addition to consuming a large amount of steam; there is no ethylene recovery device for recovering lye, resulting in the process of recovering lye, and ethylene raw materials are wasted along with carbon dioxide.

There is no invention of a stabilizing process specifically for the production of vinyl acetate in an oxygen-containing process. Since the composition of the circulating gas will determine the reduction of the explosion range in the production process, thereby affecting the safety and production efficiency of the production process, there is no process for the production of vinyl acetate by the ethylene gas phase method Safety and stabilization process and device design

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