Selective hydrogenation method for alpha-methyl styrene

A technology for selective hydrogenation of methyl styrene, which is applied in hydrogenation to hydrocarbons, bulk chemical production, chemical recovery, etc., can solve problems such as high operating costs, complex reaction procedures and reaction devices, and achieve cost savings and eliminate The effect of simple process and process

Active Publication Date: 2014-04-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The final hydrogenation conversion rate and selectivity of this method are relatively high, but the hydrogenation process needs to go through two independent reaction zones, that is, two times of hydrogenation can obtain a better hydrogenation effect, and its reaction program and reaction device are relatively complicated. higher cost

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix aluminum sulfate with a content of 28.49 grams in terms of alumina and sodium silicate with a content of 56.98 grams in terms of silicon oxide (the weight ratio of aluminum oxide / silicon oxide is 1 / 2) to form 2000 ml of glue solution. Under conditions of pH 6.0, normal pressure and strong stirring, 1000 ml of nickel nitrate aqueous solution with a content of 114.53 g in terms of nickel oxide was added to the above-mentioned alumina-silica gel solution, precipitated for 40 minutes, filtered, and used 20 times the filter cake Volume of deionized water was washed for 40 minutes, filtered, washed again, and filtered again, and this process was repeated four times.

[0028] The filter cake was dried at 100°C for 10 hours, roasted at 500°C for 5 hours, cooled to room temperature, ground into powder, and made into a cylinder to obtain a nickel content of 44.1wt% and a particle size of Ф(2 ~6)×(2~5)mm nickel-based catalyst.

[0029] Take the specific surface area as 110 me...

Embodiment 2

[0035] The process of Example 1 was repeated, except that the reaction temperature was changed to 40° C., and the results are shown in Table 1.

Embodiment 3

[0037] The process of Example 1 was repeated, except that the reaction temperature was changed to 50° C., and the results are shown in Table 1.

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Abstract

The invention provides a selective hydrogenation method for alpha-methyl styrene, which comprises: alpha-methyl styrene-containing raw material circulation pass through nickel-based catalyst and palladium-based catalyst with hydrogen in sequence, after one-step hydrogenation, the alpha-methyl styrene is converted into isobutylbenzene. Optimally, nickel-based catalyst and palladium-based catalyst are contacted directly. According to the hydrogenation method provided by the invention, the reaction material circulation continuously passes through different catalysts, thereby realizing one-step hydrogenation, and simplifying reaction equipment and reaction technology, and saving cost. In addition, according to the invention, the hydrogenation reaction condition is mild, and the catalyst activity is high, and the hydrogenation conversion rate and hydrogenation selectivity are high.

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. Background technique [0002] Alpha-methylstyrene is an essential by-product of the cumene-phenol process. Alpha-methylstyrene is generally considered an undesirable reaction by-product due to the difficulty in removing it from the phenol in the rectification step and from the recycled cumene stream. If the α-methylstyrene produced in the phenol synthesis is hydrogenated to generate cumene, and then it can be returned to the oxidation unit to continue oxidation to regenerate phenol, which can greatly reduce the material consumption of the device, increase the total yield of the phenol process, and obtain Considerable economic benefits. Cumene Cumene [0003] For the hydrogenation of α-methylstyrenes, a slurry method has been used in the prior art, wherein a Reney nickel catalyst is used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/085C07C5/03
CPCY02P20/52Y02P20/582
Inventor 柴忠义杜周季静张富春纪玉国任玉梅
Owner CHINA PETROLEUM & CHEM CORP
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