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Selective hydrogenation method of alpha-methyl styrene

A methylstyrene, selective hydrogenation technology, applied in chemical instruments and methods, hydrogenation to hydrocarbons, metal/metal oxide/metal hydroxide catalysts, etc. Complex hydrogenation process and other problems, to achieve the effect of low catalyst cost, high conversion rate and hydrogenation selectivity, and high activity

Active Publication Date: 2015-03-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A hydrogenation of α-methylstyrene using a Reney nickel catalyst in a slurry process was previously disclosed, but due to the loss of aromatic compounds, this process was mostly replaced by a fixed bed process, although the slurry process was effective, But it requires two distillation towers and related equipment, as well as energy for cooling and pressure. In addition, Reney nickel-based catalysts have the disadvantages of excessive hydrogenation to produce undesired by-products and the need for frequent addition of fresh catalysts.
[0004] Hydrogenation of α-methylstyrene using noble metal catalysts such as palladium catalysts has high conversion and high selectivity, however, noble metal catalysts are more expensive than nickel-based catalysts
[0005] Chinese patent publication CN1793089A discloses a mixed catalyst system for the hydrogenation of α-methylstyrene to cumene, which includes feeding a feed stream containing up to 10% α-methylstyrene to the reaction system, in A nickel-based catalyst is used in a fixed-bed catalytic reaction to convert 70 to 95% of α-methylstyrene into cumene, and a precious metal catalyst is used in the second fixed-bed catalytic reaction to convert α-methylstyrene into cumene, however, the hydrogenation process is complicated and the operating costs are high

Method used

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  • Selective hydrogenation method of alpha-methyl styrene
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  • Selective hydrogenation method of alpha-methyl styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use 2000 ml of mixed glue solution of aluminum sulfate and 103.0 grams of sodium silicate (alumina / silicon oxide weight ratio of 1 / 5) with a content of 20.6 grams of alumina and silica, at a temperature of 50 ° C, pH value 6.0, under normal pressure and strong stirring conditions, 1000 ml of an aqueous nickel nitrate solution with a content of 76.4 grams in terms of nickel oxide was added to the above-mentioned mixed glue solution, precipitated for 30 minutes, filtered, and used 10 times of the deionized water of the filter cake volume. Wash for 40 minutes, filter, wash again, filter again, and this process is repeated four times.

[0024] The filter cake was dried at a temperature of 100°C for 10 hours, calcined at a temperature of 450°C for 8 hours, cooled to room temperature, ground into powder, and beaten into flakes to obtain the catalyst A-1 of the present invention. See Table 1 for the data.

Embodiment 2

[0026] Use 2000 ml of mixed glue solution of aluminum sulfate and 73.64 grams of aluminum sulfate and 73.64 grams of sodium silicate (alumina / silicon oxide weight ratio is 1 / 3) in terms of alumina and silicon oxide, at a temperature of 60 ° C, pH value 7.0, under normal pressure and strong stirring conditions, 1000 milliliters of nickel nitrate aqueous solution with a content of 101.81 grams in terms of nickel oxide was added to the above-mentioned mixed glue solution, precipitated for 30 minutes, filtered, and used 10 times of the deionized water of the filter cake volume. Wash for 40 minutes, filter, wash again, filter again, and this process is repeated four times.

[0027] The filter cake was dried at a temperature of 100°C for 10 hours, calcined at a temperature of 500°C for 5 hours, cooled to room temperature, ground into powder, and beaten into a column to obtain the catalyst A-2 of the present invention. See Table 1 for the data.

Embodiment 3

[0029] Use 2000 ml of mixed glue solution of 28.49 grams of aluminum sulfate and 56.98 grams of sodium silicate (alumina / silicon oxide weight ratio is 1 / 2) in terms of alumina and silica, at a temperature of 70 ° C and a PH value of 6.0 , under normal pressure and strong stirring conditions, 1000 ml of an aqueous nickel nitrate solution with a content of 114.53 grams in terms of nickel oxide was added to the above-mentioned alumina-silica gel liquid, precipitated for 40 minutes, filtered, and removed with 20 times of filter cake volumes. Washed with ionized water for 40 minutes, filtered, washed again, filtered again, and this process was repeated four times.

[0030] The filter cake was dried at a temperature of 100°C for 10 hours, calcined at a temperature of 500°C for 5 hours, cooled to room temperature, ground into powder, and beaten into flakes to obtain the catalyst A-3 of the present invention. See Table 1 for the data.

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Abstract

The invention relates to a selective hydrogenation method of alpha-methyl styrene, which comprises the following steps: contacting a charging flow containing alpha-methyl styrene with a nickel catalyst in a fixed bed reactor, performing one-step slow hydrogenation to convert alpha-methyl styrene in the charging flow into isopropyl benzene. The nickel catalyst adopts an alumina / silicon oxide compound as a carrier, and adopts metal nickel as an active component. The content of alpha-methyl styrene in the charging flow is less than or equal to 18 wt%. The hydrogenation conversion rate of alpha-methyl styrene is up to 99.6%, and the hydrogenation selectivity is 99.9%.

Description

technical field [0001] The invention relates to a method for selective hydrogenation of petroleum hydrocarbons, in particular to a method for selective hydrogenation of α-methylstyrene, which achieves a combination of high conversion and high selectivity at lower catalyst costs. Background technique [0002] Alpha-methylstyrene is an essential by-product of the cumene-phenol process. Alpha-methylstyrene is generally regarded as an undesired reaction by-product due to the difficulty in removing alpha-methylstyrene from both the phenol in the rectification step and from the recycled cumene stream. Alpha-methylstyrene produced in phenol synthesis can be hydrogenated to cumene to improve the overall yield of the phenol process. [0003] A slurry process for the hydrogenation of alpha-methylstyrene using Reney nickel catalysts was previously disclosed, but this process was largely replaced by a fixed bed process due to the loss of aromatic compounds, although the slurry process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/085C07C5/03B01J23/755
CPCY02P20/52
Inventor 柴忠义杜周纪玉国季静任玉梅
Owner CHINA PETROLEUM & CHEM CORP
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