Acid-activated montmorillonite cesium-loaded catalyst and application thereof in catalytic synthesis of aziridine from monoethanolamine

Abstract

The invention discloses an acid-activated montmorillonite cesium-loaded catalyst and an application of the acid-activated montmorillonite cesium-loaded catalyst in catalytic synthesis of aziridine from monoethanolamine. A carrier for the catalyst is acid-activated montmorillonite, and the composition of active components is CsaXbOc, wherein X is phosphorus, iron or boron element, O is oxygen element, a, b and c are molar ratios of Cs, X and O, when a is equal to 1, b is equal to 0.5-1.5, and the value of c depends on a and b. A preparation method of the catalyst comprises the step of loading the active components by using an equivalent-volume impregnation method after acid-activated treatment of the montmorillonite. The method is simple, and the conditions are controllable. According to the acid-activated montmorillonite cesium-loaded catalyst, and the application and the preparation method of the catalyst disclosed by the invention, the acidity of the catalyst is adjusted by utilizing the acid-activated montmorillonite, and the obtained catalyst is used for synthesis of aziridine by monoethanolamine intramolecular dehydration reaction, improves the conversion rate of the monoethanolamine, and also maintains high selectivity of the product aziridine simultaneously.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for catalyzing the synthesis of aziridine from monoethanolamine. Background technique [0002] The molecular formula of aziridine is: C 2 h 5 N, also known as ethyleneimine, aziridine, aziridine and ethyleneimine, is an important intermediate in organic synthesis and is widely used in the preparation of anti-cancer drugs, insecticides, reactive dyes, etc. [0003] The initial industrial production method of aziridine is a liquid phase method, and monoethanolamine is used as a raw material to obtain aziridine through intramolecular dehydration reaction. The reaction equation is as follows: [0004] [0005] A large amount of concentrated sulfuric acid and concentrated alkali are required in this reaction, the cost is high, the yield is low, and a large amount of inorganic salt by-products with low utilization value are generated. Therefore, the gas-s...

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Problems solved by technology

Chinese patent CN103657694A reports a composite oxide catalyst composed of titanium, phosphorus, boron, alkaline earth metals and alkali metals. The selectivity of aziridine reaches 92%, but the conversion rate of monoethanolamine is only 63%.

In the prior art, the catalyst is highly acidic and prone to intermolecular condensation reactions to generate piperazine by-products, resulting in a reduction in aziridine selectivity; the catalyst is highly alkaline and prone to deamination reactions to generate by-product acetaldehyde, which further reacts with Product aziridine reacts to generate 1-aziridine base ethanol, thereby affecting the further improvement of aziridine product selectivity

The catalysts reported in current patents only use phosphide or boride to adjust the acidity. While the conversion rate is increased, the selectivity is greatly reduced, and it is difficult to obtain a high conversion rate of monoethanolamine and aziridine at the same time.

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