Method for selective hydrogenation of methyl-alpha-methyl styrene

A technology for selective hydrogenation of methyl styrene, applied in the fields of hydrogenation, organic chemistry, etc., can solve the problems of frequent addition of fresh catalyst, complicated hydrogenation process, and undesired by-products, and achieve low catalyst cost and high activity , The effect of mild hydrogenation reaction conditions
CN102964199BActive Publication Date: 2014-12-03CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2014-12-03

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Abstract

The invention relates to a method for selective hydrogenation of methyl-alpha-methyl styrene, which comprises the following steps: in a fixed bed reactor, allowing a feed flow containing methyl-alpha-methyl styrene to contact with a nickel catalyst in the reactor to perform one-step slow hydrogenation so as to convert the methyl-alpha-methyl styrene in the feed flow into isopropyl toluene, wherein the nickel catalyst adopts an alumina / silica compound as a carrier and adopts metal nickel as an active component. The content of methyl-alpha-methyl styrene in the feed flow is less than or equal to 21 wt%. the hydrogenation conversion rate of the methyl-alpha-methyl styrene is up to 99.9%, and the hydrogenation selectivity is 99.9%.
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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 methyl-α-methylstyrene, which achieves a combination of high conversion rate and high selectivity at a lower catalyst cost. Background technique

[0002] Methyl-α-methylstyrene is the main component in the light tar by-product of the m-cresol production plant. In the plant that produces 12,000 tons of m-cresol and 8,000 tons of 2,6-di-tert-butyl-p-cresol per year, The output of light tar by-products is 1.0-1.2 tons / m-cresol and 1.2-1.5 tons / p-cresol. The by-products of light tar are rich in cumene (50-60 wt%) and methyl-α-methylbenzene Ethylene (20-30wt%), light tar by-products are cut and separated, 88-90wt% of the product is extracted for hydrogenation refining, so that methyl-α-methylstyrene is converted into isopropyl toluene and returned to the oxidation unit for oxidation , Reproduction of m-cresol or p-cre...

Claims

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