Vinyl acetate purification device and process thereof

Abstract

The invention relates to a vinyl acetate purification device and a process thereof. The device comprises a primary rectifying tower, an extraction tower, a secondary rectifying tower, a primary rectifying tower first condenser, a primary rectifying tower reflux tank, a primary rectifying tower second condenser and a primary rectifying tower distillation tank. In the device, components at the top of a primary rectifying tower are secondarily condensed and enter different distillation tanks, primary condensate flows back to the primary rectifying tower, and secondary condensate is extracted to an extraction tower, so that the situation that the energy consumption of the primary rectifying tower is increased due to the fact that acetaldehyde separated by the primary rectifying tower flows back to the primary rectifying tower again is reduced; meanwhile, the separation effect of the extraction tower is improved, and the energy consumption after cooling is reduced; the filtered clear liquid directly enters the primary rectifying tower and is separated from the fed reaction liquid, so that the problem that the filtered clear liquid enters the primary rectifying tower after entering a reaction liquid pipeline, and the pipeline is blocked due to crystallization is solved.

Description

technical field [0001] The invention belongs to the field of chemical equipment, and in particular relates to a vinyl acetate purification device and a process thereof. Background technique [0002] At present, the preparation methods of vinyl acetate mainly include two kinds of ethylene method and acetylene method, wherein the technology of producing vinyl acetate by acetylene method mainly includes two kinds of technology of fluidized bed and fixed bed gas phase synthesis. The process of fluidized bed gas phase synthesis of vinyl acetate is that the mixed gas of acetylene and acetic acid reacts at a certain temperature through a fluidized bed reactor with activated carbon as the carrier and zinc acetate as the catalyst, and the reacted mixed gas comes out from the top of the reactor After the catalyst powder is separated through the powder separator, it enters the gas separation tower. The second stage of the separation tower extracts the synthetic reaction liquid, and the...

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Problems solved by technology

[0003] The first technical problem to be solved by the present invention is that part of the condensate in the gas phase distilled from the primary rectification tower in the process of fluidized bed gas phase synthesis of vinyl acetate is refluxed to the primary rectification tower, part of it is extracted to the extraction tower, and the energy consumption after cooling is High, the problem that influences the separation effect of extraction tower, the second technical problem to be solved in the present invention is that in the technique of fluidized-bed vapor-phase synthesis vinyl acetate, filter clear liquid (called filter clear liquid after rectification filtering) enters reaction liquid pipeline Entering the primary rectification tower, because the feed temperature is low and easy to crystallize, the problem of clogging the pipeline is caused. For this reason, the invention provides a vinyl acetate purification device, and then provides a vinyl acetate purification process using the device

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