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Method for removing phenylacetylene through selective hydrogenation in presence of styrene

A styrene and selective technology, applied in chemical instruments and methods, hydrocarbons, hydrocarbon purification/separation, etc., can solve the problems of low phenylacetylene hydrogenation rate, high reaction temperature, high styrene loss, etc.

Active Publication Date: 2012-08-29
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

[0022] Weigh 20 grams of theta alumina carrier, add it to a solution with a nickel nitrate content of 12%, a lanthanum nitrate content of 3%, and a zinc nitrate content of 1%, carry out equal immersion, and dry at 120 ° C for 6 hours at 400 The nickel-based catalyst A is prepared by calcining at ℃ for 8 hours, so that the nickel content is 8% by weight of the carrier, the lanthanum content is 0.2%, and the zinc content is 0.2%. The catalyst prepared above was reduced with hydrogen at 300 ° C for 6 hours, and then in weight percentage, the carbon eight fraction containing 40% styrene, 10% ethylbenzene, 0.1% phenylacetylene was used as the raw material, at a reaction temperature of 40 ° C, the weight Airspeed 3 hours -1 , under the condition that the hydrogen / alkyne molar ratio is 2:1 and the reaction pressure is 0.1MPa, a fixed bed reactor is used to make the raw material contact the catalyst to carry out the reaction, and the reaction result is: the loss rate of styrene is 0, ...

Embodiment 2

[0024] Using γ-alumina as a carrier, according to the conditions and methods of Example 1, a solution with a nickel nitrate content of 20%, a solution with a lanthanum nitrate content of 6% and a solution with a zinc nitrate content of 5% were used for equal impregnation. method, drying at 120°C for 6 hours, and calcining at 400°C for 8 hours to obtain nickel-based catalyst B, so that the nickel content is 15% by weight of the carrier, the lanthanum content is 0.8%, and the zinc content is 1%. Activated with hydrogen at a temperature of 400 ° C for 4 hours, and then used a carbon eight fraction containing 35% styrene, 12% ethylbenzene, 0.2% phenylacetylene as raw materials, at a reaction temperature of 38 ° C, weight space velocity 0.4 hours -1 , under the condition that the hydrogen / alkyne molar ratio is 10:1 and the reaction pressure is 2.5MPa, a fixed bed reactor is used to make the raw material contact the catalyst to carry out the reaction, and the reaction result is: the ...

Embodiment 3

[0026] Using γ-alumina as a carrier, according to the conditions and methods of Example 1, a solution with a nickel nitrate content of 25%, a solution with a lanthanum nitrate content of 10% and a solution with a copper nitrate content of 8% were used for equal impregnation. method, drying at 120°C for 6 hours, and calcining at 400°C for 8 hours to obtain a nickel-based catalyst C, so that the nickel content is 20% by weight of the carrier, the lanthanum content is 1.2%, and the copper content is 4%. Activated with hydrogen at a temperature of 400 °C for 4 hours, and then used a carbon eight fraction containing 20% ​​styrene, 15% ethylbenzene, and 0.06% phenylacetylene as raw materials, at a reaction temperature of 58 °C, and a weight space velocity for 15 hours. -1 , under the condition that the hydrogen / alkyne molar ratio is 3:1 and the reaction pressure is 0.5MPa, a fixed bed reactor is used to make the raw material contact the catalyst to carry out the reaction, and the rea...

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Abstract

The invention relates to a method for removing phenylacetylene through 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) 49 to 85 percent of carrier, the invention solves the problem 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 the selective hydrogenation of phenylacetylene in the presence of styrene, in particular to a method for removing phenylacetylene by using a C8 hydrocarbon fraction containing phenylacetylene as a raw material. 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 ethylbenzene dehydrogenation. In recent years, with the development of the ethylene industry and the large-scale scale, the extraction and recovery of styrene from pyrolysis gasoline has become one of the most concerned technologies for increasing the production of styrene. [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 of styrene, and at the same time, mixed xylene can be recovered, so t...

Claims

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Application Information

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IPC IPC(8): C07C7/167C07C15/46B01J23/83B01J23/887B01J23/889
Inventor 刘俊涛李斯琴蒯骏
Owner CHINA PETROLEUM & CHEM CORP
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