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Synthesis method of 4-cyanopyridine

A technology of cyanopyridine and synthetic method, applied in the field of synthesis of 4-cyanopyridine, can solve problems such as low conversion rate

Active Publication Date: 2011-06-15
NANTONG ACETIC ACID CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

4-picoline conversion is low

Method used

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  • Synthesis method of 4-cyanopyridine

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Embodiment Construction

[0021] The raw material 4-picoline and ammonia are vaporized and preheated to 180-330°C, then enter the mixer and mix with air evenly, and then distribute through the distributor on the upper part of the fixed-bed reactor and then enter the fixed-bed reactor filled with catalyst, controlled The reaction temperature is between 330-450°C, the pressure at the top of the reactor is controlled at 0.020-0.070KPa, the reaction temperature is controlled by molten salt, and the reaction gas after the reaction is separated by condensation and freezing to obtain crude 4-cyanopyridine, crude Go to rectification to get the finished product 4-cyanopyridine.

[0022] Reaction equation:

[0023]

[0024] Described catalyzer is the 4-cyanopyridine ammoxidation catalyst that is carrier with aluminum oxide, and the composition of catalyzer is as follows:

[0025] A a B b C c Cr 10 o x

[0026] Wherein A=Li (or several combinations in Na or Ti or Na, Li, Ti);

[0027] B=V (or several c...

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Abstract

The invention discloses a synthesis method of 4-cyanopyridine, which is characterized in that 4-methylpyridine is vaporized and mixed with ammonia and air; the 4-methylpyridine reacts with the ammonia and air in the presence of a catalyst, and then the finished product of 4-cyanopyridine is obtained after absorption, extraction and rectification. The method features simple process and easy operation; the conversion rate of the 4-methylpyridine is more than 99% and the yield of the 4-cyanopyridine is more than 98%.

Description

Technical field: [0001] The present invention relates to a kind of synthetic method of 4-cyanopyridine. Background technique: [0002] The existing synthetic route of 4-cyanopyridine is generally the ammoxidation method, and the reaction equipment, the catalyst used and the process control conditions are quite different. The conversion rate of 4-picoline is low. Invention content: [0003] The object of the present invention is to provide a kind of synthetic method of 4-cyanopyridine with simple technique and high yield. [0004] Technical solution of the present invention is: [0005] A method for synthesizing 4-cyanopyridine is characterized in that 4-picoline is vaporized, mixed with ammonia and air, reacted in the presence of a catalyst, and then absorbing, extracting and rectifying to obtain the finished 4-cyanopyridine. [0006] Described catalyzer is the 4-cyanopyridine ammoxidation catalyst that is carrier with aluminum oxide, and the composition of catalyzer is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D213/84B01J23/26B01J23/04B01J21/06B01J23/22B01J23/30B01J23/34B01J23/18B01J27/188B01J23/86B01J23/85B01J23/78B01J23/80B01J23/847B01J23/89B01J23/835
Inventor 丁彩峰朱小刚刘芳周新建薛建锋
Owner NANTONG ACETIC ACID CHEM
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