Process for preparing phenetidine and amino phenol by using mixture of nitrophenetol and nitrophenol as raw materials

Abstract

The invention relates to a process for preparing phenetidin and amino phenol by taking a mixture of nitrophenetol and nitrophenol as a raw material. The process comprises the following steps that: (1) a step of the catalytic hydrogenation reaction to a body, during which, the mixture of the nitrophenetol and the nitrophenol 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 are separated, a liquid phase 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), an oil phase is utilized in the next step; (4) a step of crystallization; (5) a step of solid-liquid separation, during which, solid and liquid of the material crystallized in the step four are separated, the solid phase is paraaminophenol and ortho-aminophenol, the phenetidine in the liquid phase is utilized in the next step; (6) a step of distillation separation, during which, the products of para aminophenyl ethyl ether and o-phenetidine are obtained. The process for preparing the aminoanisole and the aniline has the advantages that: the cost is low, the preliminary treatment step is saved, and the process is simple; and the process is clean, the energy consumption is low, and the 'three wastes' are little.

Description

technical field [0001] The invention relates to a process for preparing aminophenetole and aminophenol by using a mixture of nitrophenetole and nitrophenol as raw materials, and belongs to the technical field of fine chemicals. Background technique [0002] Both p-aminophenetole and o-aminophenetole as well as p-nitrophenol and o-nitrophenol are important organic intermediates. At present, the process adopted for the preparation of p-aminophenetole and o-aminophenetole is to use p-nitrophenetole and o-nitrophenetole as raw materials respectively, through reduction, and then separate and refine; p-aminophenol and o-aminophenetole Aminophenol is usually obtained by reducing p-nitrophenol and o-nitrophenol as raw materials, and then separating and refining. Usually p-aminophenetole and o-aminophenetole as well as p-nitrophenol and o-nitrophenol are independent preparation processes and separation and refining processes. This traditional preparation process has the following di...

AI Technical Summary

Problems solved by technology

Usually p-aminophenetole and o-aminophenetole as well as p-nitrophenol and o-nitrophenol are independent preparation processes and separation and refining processes. This traditional preparation process has the following disadvantages: due to the use of a single component as a raw material during the preparation , it is necessary to pre-treat the raw materials of the mixture in advance to obtain the required single-component raw materials. In the preparation process, pre-treatment requires a lot of equipment and unit operations, which inevitably has the disadvantages of high energy consumption and high cost in the production process, and in the pre-treatment process A large amount of process wastewater will be produced, causing serious environmental pollution and loss of materials, such as the treatment of these wastewater will greatly increase the cost

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