Preparation method of p-anisidine

Abstract

The invention provides a preparation method of p-anisidine, the preparation method comprises the following specific steps: (1) taking methanol, nitrobenzene and sulfuric acid as raw materials, adding a catalyst, and preparing an initial reaction solution under the condition of introducing hydrogen, (2) carrying out solid-liquid separation on the initial reaction solution, taking a solid substance as the catalyst, and reusing the solid substance in S1 to obtain p-anisidine, wherein the liquid substance is a mixture solution; and (3) adjusting the pH value of the mixture solution to be neutral by using an alkaline substance. According to the preparation method of p-anisidine, p-anisidine and ammonium sulfate are obtained through hydrogenation reduction in a low-pressure environment and liquid ammonia neutralization, high-temperature and high-pressure operation conditions are avoided, and reaction conditions are mild, and in the whole technological process, the production efficiency is high, the productivity is high, the product cost is reduced, and the overall benefit is increased.

Description

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AI Technical Summary

Benefits of technology

This patented technology involves making an intermediate compound called amino benzalchloride (ABL), which can be used for various purposes such as reducing nitrogen oxides emissions from diesel engines or improving fuel combustion performance during engine startups. It also has several technical advantages over existing methods like catalysts that use expensive chemical reagents at elevated temperatures. Overall, this new technique provides efficient manufacturing processes with increased yields while maintaining consistently good products' qualities.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving methods for producing pure chemicals from p-aminobenzene (p- aminoisocyanate) that have better efficiency compared to existing processes like reduction of nitrosimidazoles through acidic soda lime hydride or iron powders.

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