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Method for highly selective hydrogenation of phenylacetylene in the presence of styrene

A styrene, high-selectivity technology for chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., which can solve the problems of high styrene loss, high reaction temperature, and low phenylacetylene hydrogenation rate

Active Publication Date: 2015-10-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogenation gas includes a mixture of nitrogen and hydrogen. The reaction temperature of this technology is high, the hydrogenation rate of phenylacetylene is low (about 70%), and the catalyst life is short, and the loss rate of styrene is high (about 3%)
[0006] Patent CN10878902A discloses a method and equipment for purifying styrene monomers in styrene streams by hydrogenation. It dilutes hydrogen by adding hydrogen to a diluent such as nitrogen, and uses ethylbenzene to dehydrogenate the exhaust gas to provide hydrogen. The phenylacetylene impurity is hydrogenated into styrene by means of a multi-stage catalytic bed reactor, but on the one hand, the patent catalyst only talks about the selective alkyne removal method of low concentration such as 300ppm phenylacetylene content, and the phenylacetylene hydrogenation rate is low ( About 95%), the loss of styrene is high
[0007] In summary, the prior art mainly has the technical problem of high styrene loss rate, which brings great difficulties to practical industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 20 grams of θ alumina carrier, whose specific surface area is 200 meters 2 Adding nickel nitrate content is 12%, and the content of lanthanum nitrate is 3% in the solution, carry out equal amount impregnation, dry 6 hours at 120 ℃, roast 8 hours at 400 ℃, make nickel-based catalyst A, make nickel The content is 8% by weight of the catalyst, and the content of lanthanum is 0.2%. The above-mentioned prepared catalyst was reduced with hydrogen at 300° C. for 6 hours, and then by weight percent, containing 40% styrene, 10% ethylbenzene, and 0.1% phenylacetylene’s carbon octane fraction was used as raw material. At a reaction temperature of 45° C., the weight Airspeed 2 hours -1 , the hydrogen / alkyne molar ratio is 2: 1, and the reaction pressure is under the condition of 0.2MPa, the raw material is contacted with the catalyst by using a fixed bed reactor, and the reaction is carried out. The reaction result is: the loss rate of styrene is 0, and in the reaction efflu...

Embodiment 2

[0023] According to the conditions and methods of Example 1, just change the amount of impregnating liquid, impregnate by the same amount of impregnating method, dry at 120°C for 6 hours, and roast at 400°C for 8 hours to prepare nickel-based catalyst B, so that the nickel content is the weight of the catalyst 15% and the lanthanum content is 0.8%. The same raw material composition and reaction conditions as in Example 1 were used for the reaction, and the reaction result was: the loss rate of styrene was 0.5%, and the content of phenylacetylene in the reaction effluent was 3 ppm.

Embodiment 3

[0025] Using gamma alumina as the carrier, its specific surface area is 280 meters 2 / gram, according to the conditions and methods of Example 1, change the amount of impregnating liquid and adopt the equal impregnation method to impregnate, dry at 120°C for 6 hours, and roast at 400°C for 8 hours to prepare nickel-based catalyst C, so that the nickel content is the catalyst weight 20% of the lanthanum content is 1.2%. The same raw material composition and reaction conditions as in Example 1 were used for the reaction, and the reaction result was: the loss rate of styrene was 0.2%, and the content of phenylacetylene in the reaction effluent was 1 ppm.

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Abstract

The invention relates to a method for removing phenylacetylene through highly selective hydrogenation in the presence of styrene, and mainly solves the technical problem of high loss rate of styrene in the prior art. Through the adoption of the technical scheme that hydrocarbon fractions containing phenylacetylene are taken as raw materials, and under the conditions that the reaction temperature is 15 to 100 DEG C, the weight space velocity is 0.01 to 100 hours <-1>, the mol ratio of hydrogen to phenylacetylene is (1 to 30) : 1, and the reaction pressure is -0.08 to 5.0 MPa, the raw materials are in contact with a metal oxide catalyst, and phenylacetylene in a reaction effluent is hydrogenated to form styrene, wherein the metal oxide catalyst comprises the following components in percent by weight: (a) 2 to 50.0 percent of metallic nickel oxide or other oxides, (b) 0.05 to 10 percent of at least one rare earth element oxide or other oxides, and (c) 40 to 88 percent of carrier. Therefore, the invention solves the problem of high loss rate of styrene well, and can be used in the industrial production of removing phenylacetylene in the presence of styrene.

Description

technical field [0001] The invention relates to a method for highly selective hydrogenation of phenylacetylene in the presence of styrene, in particular to a method for removing phenylacetylene by using C8 hydrocarbon fractions containing phenylacetylene as raw materials. Background technique [0002] Styrene (ST) is an important monomer for the production of polystyrene (PS), ABS resin and styrene-butadiene rubber. Its production method is mainly based on ethylbenzene dehydrogenation. In recent years, with the development of the ethylene industry and the increase in scale, the technology of extracting and recovering styrene from pyrolysis gasoline has become one of the technologies for increasing the production of styrene that has attracted much attention. [0003] Pyrolysis gasoline is a by-product of the ethylene industry. The output is about 60% to 70% of the ethylene production capacity. The C8 fraction is rich in styrene and mixed xylene. A set of 1000kt / a ethylene pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/167C07C15/46B01J23/83
Inventor 刘俊涛李斯琴王万民
Owner CHINA PETROLEUM & CHEM CORP
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