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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