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Process for synthesizing biphenylamine from phenylamine by adding nitrogen gas to reactor

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

Inactive Publication Date: 2004-10-06
曹宏生
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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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  • Process for synthesizing biphenylamine from phenylamine by adding nitrogen gas to reactor

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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. Nitrogen is added to the reactor. The pressure in the reactor is 2MPa, and 10m of catalyst 3 The space velocity ratio with aniline is 0.2 / h, and the temperature is 340°C. The model of the catalyst is FD-20, which is produced by Fushun Petrochemical Research Institute. The material at the outlet of the reactor is lowered to below 150°C through the raw material product heat exchanger, and then decompressed to below 0.1MPa, and then enters the gas-liquid separator 4. High-temperature separator, the gas phase in the high-temperature separator is cooled to below 40°C by the condenser and enters the low-temperature separator, ...

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Abstract

A process for synthesizing biphenylamine from phenylamine includes such steps as metering phenylamine, heating it so 330-370 deg.C, reacting with catalyst and nitrogen gas at 320-360 deg.C, 1.6-2.5 MPa and 0.15-0.2 / h of space speed, cooling by heat exchange with raw material, gas-liquid separation to obtain intermediate liquid, heating, feeding in phenylamine rectifying tower, and purifying in biphenylamine rectifying tower. Its advantages include simple equipment, low cost, and high safety.

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 张金泉曹宏生
Owner 曹宏生
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