Process for preparing aminoanisol and aniline by using mixture of nitroanisole and nitro chlorobenzene as raw materials

Abstract

The invention relates to a process for preparing aminoanisole and aniline by taking a mixture of a nitroanisole and nitrochlorobenzene as a raw material. The process comprises the following: (1) a step of the catalytic hydrogenation reaction and the catalytic dechlorination reaction, during which, methanol is taken as a solvent, the mixture of the nitroanisole and the nitrochlorobenzene is taken as the raw material, catalyst is added, hydrogen is aerated; (2) a step of the solid-liquid separation, during which, solid and liquid in the material obtained from the step (1) after the catalytic hydrogenation reaction and the catalytic dechlorination reaction are separated, a liquid phase comprises aminoanisole, aniline, methanol, hydrochloride and water and is utilized in the next step; (3) a step of the liquid-liquid separation, during which, the oil phase-water phase liquid-liquid separation is performed in the material obtained in the step (2), the aminoanisole and aniline in the oil phase is utilized in the next step; (4) a step of distillation separation, during which, the distillation separation is performed in the oil phase to produce products of paraphenetidine, ortho-anisidine and aniline. The process for preparing the aminoanisole and the aniline has the advantages that: (1) the cost is low, the preliminary treatment step is saved, the process is simple; (2) the process is clean, the energy consumption is low, the 'three wastes' are little; (3) the purity of the product is high.

Description

technical field [0001] The invention relates to a process for preparing aminoanisole and aniline by using a mixture of nitroanisole and nitrochlorobenzene as raw materials, belonging to the technical field of fine chemicals. Background technique [0002] P-aminoanisole and o-aminoanisole and aniline are important organic intermediates. At present, the process adopted in the preparation of p-aminoanisole and o-aminoanisole is to use p-nitroanisole and o-nitroanisole as raw materials respectively, through reduction, and then separated and refined; aniline is usually It is obtained by reducing nitrobenzene as raw material and then separating and refining. Usually the preparation of p-aminoanisole, o-aminoanisole and aniline is an independent preparation process and separation and refining process respectively. This traditional preparation process has the following disadvantages: since the preparation is based on a single component as a raw material, it needs The mixed raw mat...

AI Technical Summary

Problems solved by technology

Usually the preparation of p-aminoanisole, o-aminoanisole and aniline is an independent preparation process and separation and refining process respectively. This traditional preparation process has the following disadvantages: since the preparation is based on a single component as a raw material, it needs The mixed raw materials are pre-treated in advance to obtain the required single-component raw materials. The pre-treatment in the preparation process requires a lot of equipment and unit operations, which inevitably has the disadvantages of high energy consumption and high cost in the production process. A large amount of process

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