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Catalyst for selective hydrogenation of phenylacetylene in presence of styrene

A hydrogenation catalyst and selective technology, applied in the field of phenylacetylene removal catalyst, can solve the problems of styrene loss, low phenylacetylene hydrogenation rate, high styrene loss rate, 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

Hydrogenation gas includes a mixture of nitrogen and hydrogen. The reaction temperature of this technology is relatively high, the hydrogenation rate of phenylacetylene is low (about 70%), 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 ( 95%), while the loss of styrene is about 0.2%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take by weighing 20 grams of composite carriers whose weight ratio of aluminum oxide and silicon oxide is 5: 1, add the nickel nitrate content to be 12%, the content of lanthanum nitrate is 3%, and the content of zinc nitrate is 1% in the solution, carries out Immerse in equal amounts, dry at 120°C for 6 hours, and bake at 400°C for 8 hours to prepare nickel-based catalyst A, so that the nickel content is 8% of the carrier weight, the lanthanum content is 0.2%, and the zinc content is 0.2%. The above-mentioned prepared catalyst was reduced with hydrogen at 300° C. for 6 hours, and then by weight percentage, containing 40% styrene, 10% ethylbenzene, and 0.1% phenylacetylene’s carbon octagonal fraction was used as raw material. At a reaction temperature of 50° C., the weight Airspeed 3 hours -1 , the hydrogen / alkyne molar ratio is 2: 1, under the condition of 0.1MPa reaction pressure, adopt fixed-bed reactor to make raw material and catalyst contact, carry out reaction, r...

Embodiment 2

[0023] The weight ratio of aluminum oxide and silicon oxide is a composite carrier of 20:1 as a carrier, according to the conditions and methods of Example 1, respectively adopting a solution with a nickel nitrate content of 20%, a solution with a content of lanthanum nitrate that is 6% and The content of zinc nitrate is 5% solution impregnated by the equal-volume impregnation method, dried at 120°C for 6 hours, and roasted at 400°C for 8 hours to obtain nickel-based catalyst B, so that the nickel content is 15% of the weight of the carrier, and the lanthanum content is 0.8 %, the content of zinc is 1%. 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 0.3%, and the content of phenylacetylene in the reaction effluent was 6 ppm.

Embodiment 3

[0025] The weight ratio of aluminum oxide and silicon oxide is that the composite carrier of 40: 1 is carrier, according to the condition and method of embodiment 1, adopt respectively the solution that nickel nitrate content is 25%, the content of lanthanum nitrate is 10% solution and The content of copper nitrate is 8% solution impregnated by equal-volume impregnation, dried at 120°C for 6 hours, and roasted at 400°C for 8 hours to prepare nickel-based catalyst C, so that the nickel content is 20% of the weight of the carrier, and the lanthanum content is 1.2 %, the copper content is 4%. 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, and the content of phenylacetylene in the reaction effluent was 6 ppm.

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Abstract

The invention relates to a catalyst for selective hydrogenation of phenylacetylene in the presence of styrene, which mainly solves the technical problems of low phenylacetylene hydrogenation rate and high styrene loss rate in the prior art. The catalyst for selective hydrogenation of phenylacetylene in the presence of styrene comprises the following components in percentage by weight: 2 to 50% of metallic nickel or oxide thereof, 0.05 to 10% of at least one element which is chosen from rare earth or oxide of the element, 0.01 to 6% of at least one element which is chosen from IB, IIB, VIB or VIIB in the periodic table of elements or oxide of the element and 49 to 85% of carrier which is a complex carrier chosen from alumina and silicon oxide, and the weight ratio of the alumina to silicon oxide is 0.01 to 100:1. The catalyst for selective hydrogenation of phenylacetylene in the presence of styrene can solve the problem well, and can be used for industrial production of hydrogenation removal of phenylacetylene in the presence of styrene.

Description

technical field [0001] The invention relates to a catalyst for selective hydrogenation of phenylacetylene in the presence of styrene, in particular to a catalyst 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 plant ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/883B01J23/889C07C15/46C07C5/09
Inventor 李斯琴刘俊涛孙凤侠
Owner CHINA PETROLEUM & CHEM CORP
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