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Method for preparing high-purity acrylonitrile
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An acrylonitrile, high-purity technology, applied in the purification/separation of carboxylic acid nitrile, organic chemistry, etc., can solve the problems of adding new impurities of acrylonitrile and small processing capacity of acrylonitrile
Active Publication Date: 2014-05-28
CHINA PETROLEUM & CHEM CORP +1
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[0013] The above-mentioned documents only relate to the removal method of a single or a small number of impurities in acrylonitrile, and the raw material acrylonitrile processing capacity is relatively small in the removal process, or new compounds are introduced to increase the new impurities of the raw material acrylonitrile, and the raw material acrylonitrile is not removed. A method for simultaneous removal of various trace impurities such as acetaldehyde, hydrocyanic acid, acetone, acrolein, methacrylonitrile, oxazole, propionitrile, acrylonitrile, polymerization inhibitors, peroxides, and iron ions in nitrile And other issues
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Embodiment 1
[0032] use figure 1 The flow process, wherein the adsorption tower 1 is filled with 001 gel-type styrene-based strong-acid cation exchange resin, and the 001 gel-type styrene-based strong-acid cation-exchange resin is first washed with water, 4% hydrochloric acid pickling, water washing, and 4% sodium hydroxide alkali wash , water washing, 4% hydrochloric acid pickling, water washing and other pretreatments, dry and activate under vacuum conditions at 70°C for 8 hours, and the operating conditions of the adsorption tower 1 are: treatment temperature 35°C, raw material acrylonitrile volume space velocity 300 hours -1 . The adsorption tower 2 is filled with 201 gel-type styrene-based strong base anion exchange resins, and the 201 gel-type styrene-based strong base anion-exchange resins are first washed with water, 4% sodium hydroxide alkali wash, water washed, 4% hydrochloric acid pickling, water washed , 4% sodium hydroxide alkali washing, water washing and other pretreatments...
Embodiment 2～15
[0034] Operate by each step and condition of embodiment 1, just change the resin or aluminum oxide type of adsorption tower 1, adsorption tower 2, adsorption tower 3, processing temperature and acrylonitrile space velocity, the vacuum degree of rectifying tower 4, tower top temperature , tower kettle temperature, reflux ratio, number of feed trays, number of trays taken out from the side line and other operating conditions, the specific process operating conditions are shown in Table 2, and the impurity content in the gained high-purity acrylonitrile is shown in Table 3.
[0035]
[0036]
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Abstract
The invention relates to a method for preparing high-purity acrylonitrile, which mainly solves the problems that acrylonitrile raw material treatment capacity is low in the process of removing aldehyde, hydrocyanic acid, acetone, acrolein, methacrylonitrile, oxazole, propionitrile, butene nitrile, a polymerization inhibitor, peroxide, iron ions and other trace impurities from the acrylonitrile raw material, or new compounds are introduced and new impurities of the acrylonitrile raw material are increased but a method for simultaneously removing various trace impurities from the acrylonitrile raw material is absent, and the like in the prior art. The method comprises the following steps of: a) contacting the acrylonitrile raw material with cation exchange resin to obtain a material flow I from which the oxazole is removed; b) contacting the material flow I with anion exchange resin to obtain a material flow II from which the acrolein is removed; c) contacting the material flow II with alumina to obtain a material flow III from which the peroxide and water are removed; and d) rectifying the material flow III by using a rectifying tower, and performing side stream gas phase production at a position of 5-15 plates of the rectifying tower (counted from bottom to top) to obtain the high-purity acrylonitrile which has the purity of 99.99 percent and from which the aldehyde, the hydrocyanic acid, the acetone, the acrolein, the methacrylonitrile, the oxazole, the propionitrile, the butene nitrile, the polymerization inhibitor, the peroxide and the iron ions are removed. The technical scheme solves the problems; and the method can be applied to industrial production of purification treatment of high performance polyacrylonitrile-based carbon fiber materials.
Description
technical field [0001] The invention relates to a method for preparing high-purity acrylonitrile. Background technique [0002] High-performance polyacrylonitrile-based carbon fiber has good material comprehensive properties: high strength, high modulus, low density, high and low temperature resistance, chemical corrosion resistance, good electrical conductivity, small thermal expansion coefficient, radiation resistance, and good biocompatibility. The most important reinforcement material of advanced composite materials is widely used in cutting-edge aerospace fields such as satellites, launch vehicles, tactical missiles, aircraft, and spacecraft. [0003] Acrylonitrile is the main raw material for producing high-performance polyacrylonitrile-based carbon fibers. One of the keys to the performance of carbon fibers is the quality of acrylonitrile raw materials. The preparation of high-performance polyacrylonitrile-based carbon fibers requires extremely high impurity content ...
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