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Process for preparing biphenylamine from phenylamine by vacuum rectification while heating

A technology of vacuum distillation and diphenylamine method, which is applied in the preparation of amino compounds from amines, the preparation of amino-substituted hydrogen atoms, and organic chemistry, etc., can solve the problems of incomplete reduction of hydrogen consumption and high cost

Inactive Publication Date: 2004-03-10
NANJING TECH UNIV +1
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Problems solved by technology

However, because it needs a synthetic ammonia device and does not completely reduce hydrogen consumption, its cost is still high

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0007] Aniline is determined by the volume of the aniline metering tank (v=6m 3 ), a metering pump (piston pump), with a flow rate of 2t / h after metering, through a nitrogen buffer bag (P=2.0MPa, V=0.3m 3 ) into the aniline heating 2, the raw material product heat exchanger is preheated, and then heated to 340 °C by an electric heater and enters the reactor (the model is FD-20, a 10m catalyst produced and sold by Fushun Petrochemical Research Institute 3 , pressure P=2.0MPa) 3 internal reaction, the material at the outlet of the reactor is reduced to below 150°C through the raw material product heat exchanger, then decompressed to below 0.1MPa, enters the high-temperature separator in the gas-liquid separator 4, and is separated at high temperature The gas phase in the condenser is cooled to below 40°C by the condenser and enters the low-temperature separator, and the liquid phase of the high-temperature separator and the low-temperature separator enters the reaction intermedi...

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Abstract

A process for synthesizing biphenylamine from phenylamine includes such steps as metering phenylamine, heating it to 330-370 deg.C, loading in reactor containing catalyst, chemical reaction, cooling to 150 deg.C by heat exchange with raw material, separating gas from liquid to obtain intermediate liquid, heating the intermediate liquid, vacuum rectifying while heating, and purifying. Its advantages include low operation temp. high safety, long service life of equipment, high quality of product and low cost.

Description

Technical field: [0001] The invention relates to a method for synthesizing diphenylamine by using aniline as a raw material, and the prepared product is used for synthesizing rubber antioxidants, dye intermediates and important stabilizers. It belongs to the field of fine chemical technology. Background technique: [0002] Prior art such as CN1186802A, the title of invention is an aniline continuous synthesis diphenylamine industrial system. Its structure includes a reactor and its outlet connected in series with a gas-liquid separator, an adsorber, a nitrogen absorber, and a gas-water separator, and a dry purifier is arranged before the reactor, and the inlet of the dry purifier is connected from the synthetic ammonia raw material gas ( That is, refining gas), the purified gas outlet of the clean purifier is connected to the reactor, the gas phase inlet, and the desorption gas outlet is connected back to the first-stage inlet of the high-pressure process of the ammonia syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C209/02C07C209/68C07C211/55
Inventor 乔旭曹宏生张金泉
Owner NANJING TECH UNIV
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