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Prepn process of pyridine and methyl pyridine

A technology of picoline and pyridine, which is applied in the field of preparation of pyridine and picoline, can solve the problems of low selectivity and low yield of products pyridine and picoline, and achieve the effect of improving selectivity and yield

Inactive Publication Date: 2004-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the low selectivity and yield of products pyridine and picoline when molecular sieves catalyze ammonia and carbonyl compounds in the prior art, and a new method for preparing pyridine and picoline is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of HZSM-5

[0020] 40 grams of NaZSM-5 sample (silicon aluminum molar ratio SiO 2 / Al 2 o 3 125) with 800 ml, 1.0 mol / L concentration of NH 4 NO 3 The aqueous solution undergoes an exchange reaction, is filtered, washed with deionized water, and dried at 110°C to obtain NH 4 ZSM-5. HZSM-5 by NH 4 ZSM-5 is obtained by roasting at 550°C. Chemical analysis showed that HZSM-5 had a silica / alumina molar ratio of 118.

Embodiment 2

[0022] Preparation of silicon-treated ZSM-5

[0023] With the HZSM-5 sample (silicon-aluminum mol ratio SiO of 10 gram example 1 preparations) 2 / Al 2 o 3 118, grain size 2-3 microns) in 500 ml of ethanol solution containing 5.0 g of TEOS was stirred at room temperature for 24 hours, the solid was filtered and dried at 110°C in a flowing nitrogen atmosphere. Then the above samples were calcined in air at 550°C to obtain HZSM-5 with an inert silicon oxide coating formed on the outer surface of the molecular sieve.

Embodiment 4

[0031] Carry out silicon modification treatment to ZSM-5 molecular sieve according to each step and condition of embodiment 2, just change the concentration of silicon-containing compound organic solution to be 1 mol / liter, modification treatment temperature is 40 ℃, treatment time is 20 hours, then Evaluation by each condition and step of embodiment 3, reaction result is: acetaldehyde conversion rate is 96.0%, pyridine and picoline yield are 78.5% (mole), and polyalkylpyridine and heavy component yield are 17.5% ( Moore).

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Abstract

The present invention is the preparation process of pyridine and methyl pyridine and aims at providing production process superior to available technology, which has low selectivity and low yield of products pyridine and methyl pyridine. The technological scheme of the present invention adopts ammonia, formaldehyde and acetaldehyde under gas phase as material and molecular sieve modified with organic solution of silicon compound and / or germanium compound as catalyst. The present invention may be used in the industrial production of pyridine and methyl pyridine.

Description

technical field [0001] The invention relates to a method for preparing pyridine and picoline, in particular to a method for preparing pyridine and picoline by modifying a molecular sieve catalyst with a silicon compound or a germanium compound and a mixture thereof. Background technique [0002] Pyridine is an important intermediate in the production of pesticides and pharmaceuticals, but also an important solvent in the polymer and textile industries. Important derivatives of pyridine include niacin and nicotinamide (essential vitamins required for human health), chlorpheniramine (an antihistamine), cetylpyridinium salt (a fungicide and preservative), iso Niacinazine (an important anti-tuberculosis drug), and paraquat (a herbicide). [0003] Pyridines with one methyl group attached to the ring structure are called picolines or picolines, and include 2-picoline, 3-picoline, and 4-picoline. Pyridine and picoline are available as by-products of ...

Claims

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Application Information

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IPC IPC(8): C07D213/09
Inventor 杨为民孙洪敏
Owner CHINA PETROLEUM & CHEM CORP
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