Continuous hydrogenation method and application of ethyl pyrazine-2-carboxylate

Abstract

The invention provides a continuous hydrogenation method of ethyl pyrazine-2-carboxylate. The continuous hydrogenation method comprises the following steps: dispersing a mixture of ethyl pyrazine-2-carboxylate and hydrogen to form a gas-liquid mixture containing small liquid drops with sizes of 50 nm-5 mm, wherein the gas-liquid mixture is used as a reaction raw material; and continuously inputting the reaction raw material into a fixed bed reactor, carrying out a catalytic hydrogenation reaction, and continuously discharging ethyl pyrazine-2-carboxylate, wherein the fixed bed reactor is divided into at least two temperature control sections along the flowing direction of the material, and the temperature of the latter temperature control section is controlled to be lower than the temperature of the former temperature control section. According to the above forced dispersion process, the reaction raw material can be subjected to high-performance mass transfer in the catalytic hydrogenation reaction process, so the sufficient reaction degree of the reaction raw material is improved, and reaction time is shortened. The fixed bed reactor is subjected to sectional temperature controlalong the flowing direction of the material, so heat accumulation can be effectively removed, a reaction state in the reactor can be effectively controlled, and the yield, purity and product performance stability of a target product, namely ethyl pyrazine-2-carboxylate are improved.

Description

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AI Technical Summary

Benefits of technology

The technology described in this patented describes an improved way to make certain chemicals called pimelic acid or 4-(pirfenoxymonazo)acetic acid (PPMNA). These compounds have various uses such as being useful intermediates in medicine chemistry researches. They were made through reacting formaldehydes and amines under specific conditions. This was done successfully because it allowed these molecules to mix together while forming tiny particles that could move around inside liquid crystals. It resulted in better results when making new products like pesticides.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the efficiency and quality of producing chemicals from alkynes due to their potential explosion hazards during production processes such as hydrocracking. Current methods involve multiple steps that require significant amounts of energy input, which can lead to unsafe conditions when workers are exposed while performing these operations. Therefore there is an urgent demand for improved ways to produce chemistry with fewer steps without compromising on its overall effectiveness.

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