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Method for preparing 2-methylacraldehyde and 2-methyl-2-pentenal synchronously

A technology of methacrolein and pentenal, applied in chemical instruments and methods, preparation of carbon-based compounds, preparation of organic compounds, etc.

Active Publication Date: 2013-07-17
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The method for preparing 2-methacrolein and 2-methyl-2-pentenal with 1-butene or n-butanol as raw material has not been reported at present

Method used

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  • Method for preparing 2-methylacraldehyde and 2-methyl-2-pentenal synchronously
  • Method for preparing 2-methylacraldehyde and 2-methyl-2-pentenal synchronously
  • Method for preparing 2-methylacraldehyde and 2-methyl-2-pentenal synchronously

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Experimental program
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Embodiment 1

[0030] Such as figure 1 As shown, the mixed gas A of 1-butene / oxygen / water vapor / nitrogen = 5 / 1 / 0.3 / 4 (volume ratio) is preheated to 232°C, and passed into the oxidation reactor 1 at a total flow rate of 40L / min Oxidation reaction is carried out in the oxidation reactor 1, which is a stainless steel reaction tube with 2kg of catalyst, inner diameter of 25mm and height of 6.1m. Based on the total weight of the catalyst, the catalyst contains 6.7% Mo, 2.1% V, 1.1% K, 0.5% Ce, 0.03% P, 3.8% W, 15% Al, and the rest is Si. The content of each element in the catalyst mentioned above is the weight content calculated as the oxide of each element. Quartz sand is used as the diluent, the weight ratio of the catalyst and the diluent is 1:1, and the particle size of the catalyst and the quartz sand are both 2-4mm. The temperature of the reaction tube is controlled at 250-260°C, and the reaction pressure is controlled at 0.3±0.02mPa.

[0031] The reaction product coming out of the oxida...

Embodiment 2

[0036] Such as figure 1 As shown, the mixed gas A of n-butanol / oxygen / water vapor / nitrogen=1 / 1 / 0.1 / 4 (volume ratio) is preheated to 232°C, and passed into the oxidation reactor 1 at a total flow rate of 90L / min Carry out oxidation reaction, oxidation reactor 1 is in a stainless steel reaction tube that 2kg catalyst is housed, inner diameter is 25mm, height 6.1m. Based on the total weight of the catalyst, the catalyst contains 6.7% Mo, 2.1% V, 1.1% K, 0.5% Ce, 0.03% P, 3.8% W, 15% Al, and the rest is Si. The content of each element in the catalyst mentioned above is the weight content calculated as the oxide of each element. Quartz sand is used as the diluent, the weight ratio of the catalyst and the diluent is 1:1, and the particle size of the catalyst and the quartz sand are both 2-4 mm. The temperature of the reaction tube is controlled at 320-330°C, and the reaction pressure is controlled at 0.3±0.06mPa.

[0037] The reaction product coming out of the oxidation reactor 1...

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Abstract

The invention discloses a method for preparing 2-methylacraldehyde and 2-methyl-2-pentenal synchronously, which is to prepare 2-methylacraldehyde and 2-methyl-2-pentenal by oxidizing 1-butene or n-butyl alcohol with an oxygen-containing gas and by subjecting the product of the oxidization to aldol condensation. In the method, the oxidization of the 1-butene or n-butyl alcohol and oxygen is performed in a reactor containing a solid catalyst, and the aldol condensation is performed in a reactor containing a liquid homogeneous phase catalyst. The method has the advantage that the production of 2-methylacraldehyde by using 1-butene or n-butyl alcohol as main raw material not only provides a new raw material source for the production of methyl methacrylate, but also provides a new method for deep processing and use of 1-butene or n-butyl alcohol.

Description

technical field [0001] The present invention relates to a method for simultaneously preparing 2-methacrolein and 2-methyl-2-pentenal. Background technique [0002] 2-Methacrolein (MAL) is an intermediate for the preparation of methyl methacrylate (MMA). Methyl methacrylate (MMA) is an important organic monomer, mainly used in the production of plexiglass, plastics, Coatings, adhesives, PVC modifiers, paints, textile sizing, advanced ester oil additives and other fine chemicals. At present, in several processes for producing methyl methacrylate (MMA) with tert-butanol or isobutene in industry, the first step reaction is the selective oxidation of tert-butanol or isobutene to synthesize 2-methacrolein (MAL). Then 2-methacrolein (MAL) is further selectively oxidized to synthesize methacrylic acid (MAA) and then esterified to MMA or MAL is directly oxidized and esterified to MMA. [0003] The most important source of isobutene or tert-butanol is petroleum cracking mix C 4 fra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/75C07C45/34C07C45/38C07C47/22C07C47/21
Inventor 楼银川邵亮锋王磊万毅吴训锟易光铨华卫琦
Owner WANHUA CHEM GRP CO LTD
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