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Modification method for catalyst applied to reaction of 3,5-dimethylpyridine and pyridine

A lutidine, catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of excess pyridine, insufficient 3-picoline market supply, 3-picoline chemical reaction Problems with low yield and selectivity

Active Publication Date: 2021-11-05
SHANDONG MINGHUA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of this invention is to provide a catalyst modification method for the reaction of 3,5-lutidine and pyridine, to solve the above-mentioned excess of pyridine, to prepare 3 - The yield and selectivity of the chemical reaction of picoline are too low, resulting in insufficient supply of 3-picoline market

Method used

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  • Modification method for catalyst applied to reaction of 3,5-dimethylpyridine and pyridine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 8g of HZSM-5 molecular sieve with 2g of silica gel, extrude, dry at 120°C for 4 hours, calcined at 540°C for 3 hours, then place the calcined catalyst in a steam environment for steam treatment at 600°C , the time is 4 hours, and the catalyst Cat-C is prepared. The reaction properties of the prepared catalysts are shown in Table 1.

Embodiment 2

[0026] Mix 4.5g HZSM-5 molecular sieve with 18.3g silica sol (solid content 30wt%), extrude, dry at 85°C for 9 hours, and bake at 580°C for 4.5 hours, then steam treatment at 500°C for After 4 hours, catalyst Cat-D was prepared. The reaction properties of the prepared catalysts are shown in Table 1.

Embodiment 3

[0028] Mix 9g of HZSM-5 molecular sieve with 1.25g of white carbon black (dry basis 80wt%), extrude, dry at 100°C for 7 hours, and bake at 480°C for 3 hours, then steam treatment at 680°C for After 7 hours, catalyst Cat-E was prepared. The reaction properties of the prepared catalysts are shown in Table 1.

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Abstract

The invention discloses a modification method for a catalyst applied to reaction of 3,5-dimethyl pyridine and pyridine. The method comprises the following steps: mixing and kneading an HZSM-5 molecular sieve and a silicon dioxide binder, conducting extrusion into strips, and successively carrying out drying, roasting and water vapor treatment to prepare a ZSM-5 catalyst. According to the modification method for the catalyst applied to the reaction of 3,5-dimethylpyridine and pyridine, the prepared ZSM-5 catalyst is applied to the chemical reaction of 3,5-dimethylpyridine and pyridine to generate 3-methylpyridine; and compared with a catalyst which is not treated by water vapor or is prepared by an aluminum oxide binder, the ZSM-5 catalyst further improves the conversion rate of pyridine and the selectivity of 3-methylpyridine.

Description

technical field [0001] The invention relates to the technical field of molecular sieve catalysts, in particular to a catalyst modification method for the reaction between 3,5-lutidine and pyridine. Background technique [0002] 3-picoline is the main raw material for the preparation of nicotinic acid and nicotinic acid ammonia, it can also be used to prepare vitamins, and it is also an important intermediate for the synthesis of pyridine flavors and new insecticides. The current market is in short supply. 3-Methylpyridine was first recovered from the by-products of coal coking fractionation. However, due to the large number of pyridine components in coking by-products, complex products, difficult separation, and low yield, it is mainly produced by aldehyde ammonia synthesis. [0003] The method for synthesizing 3-picoline by aldehyde ammonia synthesis method is mainly to prepare pyridine and 4-picoline by adding a large amount of formaldehyde to the raw material on the basis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07D213/10
CPCB01J29/40C07D213/10Y02P20/52Y02P20/584
Inventor 赵彦平李袁谢朝郭彦超颜明
Owner SHANDONG MINGHUA NEW MATERIAL CO LTD
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