Abstract: The present disclosure relates to a method for producing vinyl acetate, comprising a vinyl acetate synthesis process, a vinyl acetate refining process and a separation process of vinyl acetate and ethyl acetate, including an acetic acid evaporator, an oxygen mixer, a vinyl acetate synthesis reactor, a first gas separating tower, a second gas separating tower, a recovered gas compressor, a water washing tower, an absorption tower and a desorption tower, a recycling gas compressor; the vinyl acetate refining process comprising an acetic acid tower, a crude VAC tower, and a fine VAC tower, a rectifying tower, an ethyl acetate tower, a water phase receiving tank, an extracting and rectifying tower and an ethyl acetate phase separator.

Abstract: The present disclosure relates to a thermal coupling method for preparing ethylene by ethanol dehydration and device thereof. The device includes an ethanol dehydration reaction system, a quenching compression system, an alkaline washing system, a molecular sieve drying system and an ethylene purification and propylene refrigeration cycle system; ethanol dehydration reaction products in the ethanol dehydration reaction system serve as a heat source for preheating, vaporization and superheating of a raw material of ethanol; tower bottoms of an evaporation tower in the quenching compression system serve as a heat source for preheating of a feed stream of the evaporation tower and heating of an overhead gas of a quenching tower; products of ethylene in the alkaline washing system serve as a cold source for cooling of crude ethylene.

Abstract: The present invention relates to a preparation system of ethylene by ethanol dehydration and device thereof. The device includes an ethanol dehydration reaction system, a quenching compression system, an alkaline washing system, a molecular sieve drying system, an ethylene purification system and a propylene refrigeration cycle system. Part of ethylene produced by the ethylene purification system are used as circulating ethylene in the molecular sieve drying system for desorption regeneration of molecular sieve drying towers. The molecular sieve drying system includes the steps: (1) feeding crude ethylene and water from the alkaline washing system into the molecular sieve drying system, and after removing the water therefrom, feeding the obtained crude ethylene into the ethylene purification system; and (2) feeding part of the products of ethylene, as the circulating ethylene, produced by the ethylene purification system into the molecular sieve drying system.

Abstract: The present disclosure relates to a vinyl acetate production process and device. By arranging a stabilizing process, an acetic acid recovery system and a desorption system and device, the composition of circulating gas is changed, the explosion range is narrowed, the volume fraction of maximum permissible oxygen at an inlet of a reactor is increased under the same production load and the same catalyst condition, the safety of the production process is improved, and the conversion per pass across the reaction is increased; and meanwhile, a material separation sequence is reasonably segmented according to an actual production condition. The present disclosure arranges a first gas separating tower which recovers surplus heat of reaction gas, reduces the energy consumption of the system, and therefore the energy consumption throughout the production flow process is reduced; the present disclosure further arranges the acetic acid recovery system.

Abstract: The present disclosure relates to a method for producing vinyl acetate, comprising a vinyl acetate synthesis process, a vinyl acetate refining process and a separation process of vinyl acetate and ethyl acetate, including an acetic acid evaporator, an oxygen mixer, a vinyl acetate synthesis reactor, a first gas separating tower, a second gas separating tower, a recovered gas compressor, a water washing tower, an absorption tower and a desorption tower, a recycling gas compressor; the vinyl acetate refining process comprising an acetic acid tower, a crude VAC tower, and a fine VAC tower, a rectifying tower, an ethyl acetate tower, a water phase receiving tank, an extracting and rectifying tower and an ethyl acetate phase separator.