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Preparation method of pyridine and 3-picoline

A technology of picoline and pyridine, which is applied in the field of preparation of pyridine and 3-picoline, can solve the problem of low yield of pyridine and 3-picoline and by-products 2-picoline and 4-picoline Problems such as high content, to achieve the effect of good technical effect

Inactive Publication Date: 2006-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is the problem that the yield of pyridine and 3-picoline is not high or the content of by-products 2-picoline and 4-picoline is relatively high in the prior art, and a new pyridine is provided and the preparation method of 3-picoline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using water glass and aluminum sulfate as silicon source and aluminum source respectively, and tetrapropylammonium bromide as template agent, ZSM-5 raw powder was synthesized by hydrothermal synthesis method. The crystallization is carried out in a stainless steel reactor, the stirring speed is 100-200 rpm, the pressure is the pressure of the reaction system itself, and the crystallization temperature is 100-150°C. 700 grams of synthesized ZSM-5 raw powder was wet-mixed with 300 grams of alumina binder after alkylamine, and then extruded into strips, and then exchanged with ammonium nitrate solution to obtain hydrogen-type molecular sieve H-ZSM-5, whose silicon-aluminum mole than SiO2 / Al 2 o 3 for 250. This zeolite was designated as Catalyst A.

Embodiment 2

[0030] A certain amount of lead nitrate is dissolved in an appropriate amount of water to obtain a certain concentration of lead-containing solution, then a certain amount of molecular sieve H-ZSM-5 prepared in Example 1 is added to the solution for impregnation, and the obtained product is in Drying at 110°C, followed by calcination at 550°C for 4 hours gave Catalyst B with a lead content of 2.5% by weight in terms of metal.

Embodiment 3

[0032] The preparation method is the same as in Example 2, except that cobalt nitrate is used instead of lead nitrate to obtain catalyst C with a cobalt content of 1.5% (weight) in terms of metal.

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Abstract

The invention relates to a preparation method of pyridine and 3-picoline by loading ZSM-5 zeolite with metallic oxides selected form cobalt, lead or its mixture as catalyst, reacting the mixture of formaldehyde and acetaldehyde with ammonia in gaseous phase, thus obtaining high yield of pyridine and 3-methyl pyridine.

Description

technical field [0001] The invention relates to a method for preparing pyridine and 3-picoline, in particular to a method for preparing pyridine and 3-picoline by reacting aliphatic aldehyde and ammonia in the gas phase in the presence of a modified ZSM-5 zeolite catalyst. Background technique [0002] Pyridine compounds, mainly including pure pyridine and lower-carbon alkyl substituents 3-picoline, 2-picoline and 4-picoline, are important organic raw materials for the production of high value-added fine chemical products and are widely used , involving pharmaceutical intermediates, pharmaceutical products, pesticides, pesticide intermediates, feed and feed raw materials and many other fields. The most widely used pyridine compounds are pyridine and 3-picoline. Pyridine is mainly used in the pharmaceutical industry to make sulfonamides, penicillin, vitamin A, cortisone, anthelmintics and local anesthetics, etc. It can also be used in stabilizers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D213/10
Inventor 毛东森杨为民卢冠忠
Owner CHINA PETROLEUM & CHEM CORP
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