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A kind of vinyl acetylene refining method

A vinyl acetylene and refining method technology, applied in chemical instruments and methods, absorption purification/separation, organic chemistry, etc., can solve the problems of reducing organic phase, unqualified quality, excessive content, etc., to achieve convenient separation and improve purity Effect

Active Publication Date: 2022-04-05
重庆化医长寿化工集团有限公司
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  • Abstract
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  • Claims
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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

Method used

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  • A kind of vinyl acetylene refining method

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Embodiment Construction

[0033] The following is further described in detail through specific implementation methods:

[0034] The reference signs in the accompanying drawings of the description include: tower body 1, feed inlet 11, outlet 12, first tray 13, dispersion disc 14, fourth tray 15, gas channel 151, support rod 152, Umbrella cover 153, fifth tray 16, reboiler 2, column tube 21, steam inlet 22, condensed water outlet 23, interface meter 3, liquid phase outlet pipe 41, liquid phase inlet pipe 42, water separator 45, Drain pipe 46, drain valve 47, tower top condenser 5.

[0035] The embodiment is basically as attached figure 1 Shown:

[0036] A method for refining vinyl acetylene, comprising the following steps:

[0037] Step 1: Preheat the absorption liquid obtained through the degassing tower to 70-75°C, and then pass it into the desorption tower from the middle of the degassing tower;

[0038] Step 2: Use steam to heat the absorption liquid passing into the desorption tower at the botto...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C7/04C07C7/11C07C11/30
CPCC07C7/005C07C7/11C07C7/04C07C11/30
Inventor 文国礼陈耘向伟邹泽平
Owner 重庆化医长寿化工集团有限公司
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