Production method of vinyl acetate

A vinyl acetate and vinyl acetate technology, applied in the field of vinyl acetate production, can solve the problems of high energy consumption and low product yield

CN112209830AActive Publication Date: 2021-01-12TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-01-12

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Abstract

The invention relates to a production method of vinyl acetate, which comprises a vinyl acetate synthesis process, a vinyl acetate refining process and a vinyl acetate and ethyl acetate separation process. The device comprises an acetic acid evaporator, an oxygen mixer, a vinyl acetate synthesis reactor, a first gas separation tower, a second gas separation tower, a degassing tank, a water washingtower, an absorption tower, a desorption tower, an ethylene recovery tower, a recycle gas compressor and a recovery gas compressor, and the vinyl acetate refining process comprises an acetic acid tower, a crude VAC tower, a refined VAC tower, an aldehyde ester concentration tower, an acetaldehyde tower, a dehydration tower, a water phase receiving tank, an extractive distillation tower and an acetic ether tower. In the separation process of vinyl acetate and ethyl acetate, an extractive distillation process taking acetic acid as an extracting agent is adopted. According to the method, acetic acid is adopted as an extracting agent, the content of vinyl acetate in the stream without the ethyl acetate impurities is reduced from 90% or above to 5% or below, the adopted extracting agent is acetic acid carried in the feeding stream, and the process greatly reduces the operation cost of the device.
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Description

technical field

[0001] The invention relates to a method and a device for producing vinyl acetate, in particular to a production method for vinyl acetate that improves product yield, reduces waste discharge, and reduces material and energy consumption. Background technique

[0002] Vinyl acetate (VAC), also known as vinyl acetate, is an important organic chemical raw material. Through self-polymerization or copolymerization with other monomers, vinyl acetate can produce polyvinyl alcohol (PVA), vinyl acetate-ethylene copolymer (EVA), polyvinyl acetate (PVAC), vinyl acetate-vinyl chloride copolymer (EVC) and other products . These products have a wide range of uses, and are generally used in adhesives, sizing agents for paper or fabrics, paints, inks, leather processing, emulsifiers, water-soluble films, soil conditioners, etc. In 2018, my country's vinyl acetate production capacity was about 3.318 million tons per year, accounting for about 40% of the global production cap...

Examples

Embodiment Construction

[0050] The method and device for removing ethyl acetate in the vinyl acetate production process proposed by the present invention mainly include an extractive distillation tower system and an ethyl acetate tower (405) system. The following is a description of the method and device of the present invention in conjunction with the accompanying drawings.

[0051] The present invention passes figure 1 , figure 2 , image 3 The method shown implements:

[0052] Specifically, fresh ethylene enters the lower part of the acetic acid evaporator (103) after being mixed with the circulating gas from the circulating gas compressor (101), and is mixed with the fresh acetic acid from the acetic acid tower (201) in the rectification section and the fresh acetic acid from the ethylene recovery tower (117). countercurrent contact. The mixed gas of ethylene and acetic acid obtained at the top of the acetic acid evaporator (103) is further mixed with fresh oxygen in the oxygen mixer (106) an...