Vinylacetylene refining method

Abstract

The invention relates to the field of chemical engineering, in particular to a vinylacetylene refining method. The method comprises the following steps: step 1, feeding the absorption liquid treated by a degassing tower into a desorption tower from the middle part of the desorption tower; 2, heating the absorption liquid introduced into the desorption tower, cooling the gas at the top of the desorption tower, and condensing and refluxing a part of the gas; 3, detecting the temperature of the liquid at the fifth tower plate of the desorption tower from the feeding hole from bottom to top, and increasing the condensation reflux at the top of the desorption tower when the temperature is higher than 18-22 DEG C until the temperature is lower than 10-14 DEG C; and step 4, removing water in theliquid above the fourth tower plate from bottom to top from the feeding hole, and collecting uncondensed gas at the top of the desorption tower. According to the refining method of the scheme, water in the desorption solution is removed while vinylacetylene is rectified, and the boiling point of an organic phase is prevented from being reduced by the water, so that divinylacetylene in the productgas is reduced.

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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