Method for preparing methylaniline by continuous catalytic hydrogenation reduction of nitrotoluene through liquid phase

A technology for catalytic hydrogenation of nitrotoluene, which is applied in the preparation of amino compounds, chemical instruments and methods, and the preparation of organic compounds. Larger size, higher growth cost, and the effect of preventing easy explosion

Inactive Publication Date: 2018-12-14
麻城市天恒商贸有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing methylaniline by liquid phase continuous catalytic hydrogenation reduction of nitrotoluene, which solves the current domestic liquid phase solvent intermittent hydrogenation reduction process, using ethanol or methanol as a solvent , with the skeleton Ni as a catalyst, hydrogenation reaction is

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Embodiment Construction

[0023] Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] The invention provides a technical solution: a method for preparing methylaniline by liquid-phase continuous catalytic hydrogenation reduction of nitrotoluene, comprising the following steps:

[0025] S1. Preparation stage: Weigh o-nitrotoluene, m-nitrotoluene, p-nitrotoluene and nano-catalysts. The nano-catalysts are Ni-based hydrogenation catalysts. A multi-confined Ni-based hydrogenation catalyst can be prepared by using ALD technology. Hydrogen catalyst, compared with the unconfined catalyst, the activity and stability of the multi-confined Ni-based catalyst for the hydrogenation catalytic reaction of cinnamaldehyde and nitrotoluene are significantly improved, and the addition of nitrotoluene and methylaniline The mass ratio of nitrotoluene is 4:10, ...

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Abstract

The invention discloses a method for preparing methylaniline by continuous catalytic hydrogenation reduction of nitrotoluene through a liquid phase. The method comprises the following steps that: S1,the preparing stage: ortho-nitrotoluene, meta-methylnitrobenzene, paranitrotoluene and a nano-catalyst are weighed, the mass ratio of nitrotoluene to methylaniline is 4:10, the addition quantity of the nano-catalyst is 10% of the addition quantity of the nitrotoluene; S2: the starting stage: the well weighed ortho-nitrotoluene, meta-methylnitrobenzene, paranitrotoluene and the nano-catalyst are added into a high pressure reaction kettle, and a hydrogen steel cylinder reducing valve and a pressure regulating valve are opened. According to the method for preparing the methylaniline by continuouscatalytic hydrogenation reduction of the nitrotoluene through the liquid phase, the ortho-nitrotoluene, the meta-methylnitrobenzene and the paranitrotoluene replace a solvent methyl alcohol or ethylalcohol, the loss in the reaction process is reduced, the explosion easily caused by the excessively large internal pressure is prevented, meanwhile, the nano-catalyst replaces a skeleton Ni, the costof the material is reduced, and the characteristics of recycling and stability of the nano-catalyst are used.

Description

technical field [0001] The invention relates to the technical field of producing methylaniline, in particular to a method for preparing methylaniline through liquid-phase continuous catalytic hydrogenation reduction of nitrotoluene. Background technique [0002] Methylaniline is a chemical substance with a molecular formula of C7H9N, including three isomers of o-toluidine, m-toluidine and p-toluidine. The three isomers have different physical properties but have the same chemical properties. The melting point of methylaniline is minus 57 degrees Celsius, and the boiling point is 196.25 degrees Celsius. Its relative density is 0.9891, and its refractive index is 1.5684. It is slightly soluble in water, soluble in ethanol, ether, and chloroform. This chemical substance is an intermediate used in organic synthesis , acid absorbent and solvent, used in the dye industry for the production of cationic brilliant red FG, anionic pink B and reactive yellow brown KGR. [0003] At pre...

Claims

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Application Information

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IPC IPC(8): C07C209/36C07C211/47
CPCC07C209/36C07C211/47
Inventor 鲁争
Owner 麻城市天恒商贸有限公司
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