Catalyst for synthesizing methacrolein from propionaldehyde and formaldehyde and application thereof

Abstract

The invention relates to a catalyst for methacrolein and application thereof. The catalyst for synthesizing the methacrolein is composed of the following components: diethanol amine and oxalic acid. The diethanol amine and the oxalic acid are used as the catalyst, and condensation of formaldehyde and propionaldehyde is carried out in normal-pressure, low-temperature and liquid-phase states; a one-step crossed condensation reaction is carried out to obtain methacrolein which is distilled and purified to obtain the methacrolein with the content of more than 98%. Data from comprehensive analysis on the content and yield proves that compared with a target product obtained from a reaction in the presence of a catalyst solution prepared from wastewater, a target product obtained from a reaction in the presence of a catalyst solution prepared from freshwater almost does not fluctuate.

Description

technical field : [0001] The present invention relates to a catalyst for methacrolein and its application. Background technique : [0002] Methacrolein, alias methacrolein, 2-methacrolein, a-methacrolein, English name: 2-Methyl propenal; Metharolein, is a colorless liquid with a strong pungent odor, which is mainly used for copolymerization It is a raw material for the production of methyl methacrylate and thermoplastics, an important intermediate in organic synthesis, and can be used for the production of medicines, pesticides and dyes. [0003] At present, the synthesis methods of MAL mainly include the following processes: catalytic oxidation of isobutene, direct oxidation of isobutane, gas-phase oxidation of butene mixture to co-produce 1,3-butadiene, methacrolein and 2-methyl -2-propene-1-alcohol catalytic oxidation method, etc. Although these methods have cheap raw materials, the process is relatively complicated, the service life of the catalyst is short, and the d...

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Problems solved by technology

[0003] At present, the synthesis methods of MAL mainly include the following several process routes: catalytic oxidation of isobutene, direct oxidation of isobutane, co-production of butene mixture gas phase oxidation 1, 3-butadiene, methacrolein and 2-methyl-2-propen-1-ol catalytic oxidation method, etc. Although these methods have cheap raw materials, the process is relatively complicated, the service life of the catalyst is short, and the discharge of three wastes is large , not suitable for the synthetic production of refined manufacturers

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