A kind of vinyl acetylene refining method

Abstract

The invention relates to the field of chemical industry, in particular to a method for purifying vinyl acetylene; the method comprises the following steps: step 1: passing an absorption liquid obtained by a degassing tower into a desorption tower from the middle of a degassing tower; The absorption liquid is heated, and the gas at the top of the analysis tower is cooled, and part of the gas is condensed and refluxed; Step 3: Detect the temperature of the liquid at the fifth tray from the bottom to the top of the analysis tower from the feeding port, and when the temperature is higher than 18 At ~22°C, increase the condensation reflux at the top of the desorption tower until the above temperature is lower than 10 to 14°C; Step 4: Remove the water in the liquid above the fourth plate from the bottom to the top from the feeding port, and apply the same to the desorption tower. The uncondensed gas at the top is collected. The purification method of this scheme removes the water in the desorption solution while rectifying vinylacetylene, so as to prevent the water from lowering the boiling point of the organic phase, thereby reducing the divinylacetylene in the product gas.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for refining vinyl acetylene. Background technique [0002] Vinyl acetylene is an important alkyne compound, mainly used in the production of neoprene rubber, adhesive methanol glue and the preparation of divinyl ether and methyl vinyl (methyl) ketone-based polymers. In the industry, the calcium carbide method is generally used to produce acetylene. Acetylene is dimerized under the catalysis of cuprous chloride and ammonium chloride hydrochloric acid solution to obtain vinyl acetylene. In addition, many by-products will be generated. In addition to vinyl acetylene, the obtained reaction gas also includes divinyl acetylene, hydrochloric acid, acetylene, acetaldehyde, water, etc., so the reaction gas needs to be washed, absorbed, and degassed to obtain Xylene solution in which vinyl acetylene, divinyl acetylene and acetaldehyde are dissolved——absorbing liquid, the absorbi...

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Problems solved by technology

[0004] The existing device is to refine vinyl acetylene through rectification, but since the degassed absorption liquid contains a small amount of water, the water will increase with the rectification, and the water will reduce the boiling point of the organic phase, resulting in Divinyl acetylene is distilled out together with vinyl acetylene. During condensation, divinyl acetylene cannot be completely condensed into a liquid state and is discharged together with vinyl acetylene, resulting in the content of divinyl acetylene in the final vinyl acetylene gas exceeding the standard. Substandard quality

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