A kind of gas-solid phase joint production method of styrene and benzaldehyde

A technology of joint production and styrene, applied in chemical instruments and methods, preparation of organic compounds, hydrocarbons, etc., can solve the problems of high energy consumption, benzaldehyde products containing halogens, etc., and achieve low operating costs and easy continuity Production, to achieve the effect of mass production

Active Publication Date: 2021-10-15
DALIAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at the problems of high energy consumption in the industrial production of styrene and the fact that benzaldehyde products contain halogens, the present invention proposes a gas-solid phase joint production method for styrene and benzaldehyde. The present invention can reduce the energy consumption of reaction and separation, and realize continuous Sexual operation, while obtaining high value-added products

Method used

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  • A kind of gas-solid phase joint production method of styrene and benzaldehyde
  • A kind of gas-solid phase joint production method of styrene and benzaldehyde
  • A kind of gas-solid phase joint production method of styrene and benzaldehyde

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Effect test

Embodiment 1

[0053] The preparation process is the same as that of Comparative Example 2, but the carrier is the modified boron nitride obtained by S4 in Comparative Example 1, the catalyst synthesized by different metal salt types and the concentration of different metal salt solutions, and its number 2~10 and preparation conditions The corresponding relationship is shown in Table 1.

Embodiment 2

[0055] The preparation process is the same as in Comparative Example 2, but the carrier is commercial boron nitride (BN-P), the concentration of ammonium molybdate aqueous solution is 0.035g / mL, and the obtained MoOx / BN-P catalyst corresponds to No. 11 in Table 1.

[0056] Table 1 Correspondence between different catalysts and preparation conditions

[0057] Numbering catalyst Metal / wt% metal salt solvent Concentration / g / mL Calcination temperature / ℃ 1 R-BN 0 0 0 0 600 2 0.5MoOx / BN 0.5 Ammonium molybdate water 0.018 600 3 1MoOx / BN 1 Ammonium molybdate water 0.035 600 4 3MoOx / BN 3 Ammonium molybdate water 0.105 600 5 10MoOx / BN 10 Ammonium molybdate water 0.350 600 6 20MoOx / BN 20 Ammonium molybdate water 0.700 600 7 1CrOx / BN 1 Chromium nitrate water 0.140 600 8 1ZrOx / BN 1 Zirconyl nitrate water 0.054 600 9 1VOx / BN 1 Ammonium metavanadate Methanol 0....

Embodiment 3

[0059] Effects of Different Catalysts on Ethylbenzene Conversion, Styrene and Benzaldehyde Selectivity

[0060] Ethylbenzene and oxygen were used as raw materials to evaluate the performance of the gas-phase selective oxidation reaction in a fixed-bed reactor. The reaction conditions were as follows: a fixed-bed reactor with an inner diameter of 8 mm was filled with 0.1 g of catalyst, normal pressure, reaction temperature 510 ° C, N 2 / O 2 =9 (mol), ethylbenzene partial pressure is 5.6kPa, ethylbenzene / oxygen=1 (mol); after the reaction is stable, the reaction raw materials and products are detected and analyzed by online chromatography. The corresponding relationship between different catalysts and catalytic activity is shown in Table 2.

[0061] Comparing the catalyst performances of No. 3, 11, 12, and 13 with the same active component, the selected modified boron nitride or commercial boron nitride as the carrier can significantly improve the selectivity of high value-adde...

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Abstract

The invention discloses a gas-solid phase combined production method of styrene and benzaldehyde, which uses ethylbenzene and oxygen as raw materials to carry out catalytic oxidation reaction to obtain reaction feed liquid and CO x , the reaction feed liquid is separated to obtain styrene and benzaldehyde; the catalyst includes a carrier and an active component, the carrier is boron nitride, the active component is a transition metal oxide, and the synergistic effect of boron nitride and transition metal oxide promotes The generation of high value-added products is achieved, and the present invention obtains two kinds of high value-added products simultaneously, and the selectivity of styrene reaches 72%, and the selectivity of benzaldehyde reaches 22%, and CO x The selectivity is only 2%. The gas-solid phase selective oxidation reaction route reduces the energy consumption of styrene production, and the produced benzaldehyde does not contain halogen, which greatly improves the added value of the product and makes it easier to realize continuous production. In addition, ethylbenzene, styrene, and benzaldehyde are easily separated by rectification, and the operation cost is low. The reaction path and catalyst provided by the invention have industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysis, and in particular relates to a method for combined gas-solid phase production of styrene and benzaldehyde. Background technique [0002] Styrene is an important chemical monomer for the production of rubber and resin, and is widely used in construction, automobiles, electronic appliances and other fields. With the vigorous development of downstream products, the demand for styrene is increasing year by year. In 2016, the domestic consumption of styrene reached 9.8 million tons, of which the import volume was as high as 3.5 million tons (Chemical Industry, 2017, 35(3):26). The huge consumption gap has put forward higher requirements for industrial production. At present, the industry mainly produces styrene through the direct dehydrogenation of ethylbenzene. This is a reaction whose conversion rate is limited by thermodynamics. The reaction energy consumption is high (Applied Catalysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/333C07C45/36C07C47/54C07C15/46
CPCC07C5/3335C07C45/36C07C15/46C07C47/54
Inventor 陆安慧盛健李文翠
Owner DALIAN UNIV OF TECH
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