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Catalyst for use in continuous production of 2,3-dichloropyridine, and preparation method and application thereof

A technology of dichloropyridine and catalyst, which is applied in the field of catalyst for continuous production of 2,3-dichloropyridine and its preparation, can solve the problems of high yield, difficult control, complicated process, etc., achieve high catalytic activity, improve reaction Selectivity, the effect of enhancing selectivity

Active Publication Date: 2016-06-08
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses 3-aminopyridine as a raw material to synthesize 2,3-dichloropyridine through a three-step synthesis method. The process is complicated and difficult to control, but the yield is high, and it is an alternative large-scale production route.

Method used

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  • Catalyst for use in continuous production of 2,3-dichloropyridine, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039] The catalyst for the continuous production of 2,3-dichloropyridine in this embodiment includes a gear-shaped alumina carrier and Pt, Pd and Ru loaded on the gear-shaped alumina carrier, and the mass percentage of Pt in the catalyst is 0.3 %, the mass percentage of Pd is 0.1%, the mass percentage of metal M is 0.4%, the outer diameter of the gear-shaped alumina carrier is 2.5mm, the inner diameter is 1.0mm, the depth of the tooth groove is 0.75mm, and the hole The capacity is 0.7mL / g, and the specific surface area is 210m 2 / g.

[0040] The preparation method of the catalyst for continuous production of 2,3-dichloropyridine in the present embodiment comprises the following steps:

[0041] Step 1, dissolving platinum chloride containing 0.3gPt, palladium chloride containing 0.1gPd and ruthenium chloride containing 0.4gRu in dilute nitric acid with a concentration of 0.5% by mass percentage to obtain solution A, then glycerin Alcohol is added to solution A, and the volume ...

Embodiment 2

[0046] The catalyst for the continuous production of 2,3-dichloropyridine in this embodiment includes a gear-shaped alumina carrier and Pt, Pd and Ru loaded on the gear-shaped alumina carrier, and the mass percentage of Pt in the catalyst is 0.5 %, the mass percentage of Pd is 0.3%, the mass percentage of Ru is 0.1%, the outer diameter of the gear-shaped alumina carrier is 2.5mm, the inner diameter is 1.0mm, the alveolar depth is 0.75mm, and the pore volume is 0.75mL / g, and the specific surface area is 230m 2 / g.

[0047] The preparation method of the catalyst for continuous production of 2,3-dichloropyridine in the present embodiment comprises the following steps:

[0048] Step 1, dissolving platinum chloride containing 0.5gPt, palladium chloride containing 0.3gPd and ruthenium chloride containing 0.1gRu in dilute nitric acid with a concentration of 1% by mass percentage to obtain solution A, and then glycerin Alcohol is added to solution A, and the volume of added glycerol...

Embodiment 3

[0053] The catalyst for the continuous production of 2,3-dichloropyridine in this embodiment includes a gear-shaped alumina carrier and Pt, Pd and Ru loaded on the gear-shaped alumina carrier, and the mass percentage of Pt in the catalyst is 0.8 %, the mass percentage of Pd is 0.5%, the mass percentage of Ru is 0.5%, the outer diameter of the gear-shaped alumina carrier is 2.5mm, the inner diameter is 1.0mm, the alveolar depth is 0.75mm, and the pore volume 0.75mL / g, the specific surface area is 250m 2 / g.

[0054] The preparation method of the catalyst for continuous production of 2,3-dichloropyridine in the present embodiment comprises the following steps:

[0055] Step 1, dissolving platinum chloride containing 0.8gPt, palladium chloride containing 0.5gPd and ruthenium chloride containing 0.5gRu in dilute nitric acid with a mass percentage concentration of 0.5% and mixing uniformly to obtain solution A, then glycerin Alcohol is added to solution A, and the volume of added...

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Abstract

The invention provides a catalyst for use in continuous production of 2,3-dichloropyridine. The catalyst comprises a gear-shaped alumina carrier, and Pt, Pd and a metal M loaded on the gear-shaped alumina carrier, wherein the metal M is Ag, Ru or Sn; the catalyst contains 0.3-0.8 percent by mass of Pt, 0.1-0.5 percent by mass of Pd and 0.05-0.5 percent by mass of metal M. The invention further provides a preparation method for the catalyst, and a method for continuously producing 2,3-dichloropyridine by catalyzing with the catalyst. The catalyst has very high catalytic activity, selectivity and stability, and can be used for catalyzing to efficiently and continuously prepare 2,3-dichloropyridine; the molar yield of 2,3,6-trichloropyridine serving as a raw material is greater than 93 percent, the molar yield of 2,3-dichloropyridine serving as a product is greater than 76 percent, and service life of the catalyst is not less than 2300h.

Description

technical field [0001] The invention belongs to the technical field of catalytic hydrogenation selective dechlorination technology, and in particular relates to a catalyst for continuous production of 2,3-dichloropyridine, a preparation method and application thereof. Background technique [0002] 2,3-Dichloropyridine is an important fine chemical intermediate widely used in the fields of medicine and pesticides. It is the key intermediate of the new insecticides chlorantraniliprole and HGW86. At present, the synthetic methods of 2,3-dichloropyridine are as follows: [0003] One, 2,3,6-trichloropyridine reduction method. This method generates 2,3-dichloropyridine by hydrogenation and dechlorination of 2,3,6-trichloropyridine. It is a kettle-type process, and triethylamine or sodium acetate is added to absorb hydrogen chloride. There are many reaction by-products, and dechlorination is not easy. Control, low selectivity, not conducive to mass production. [0004] Two, 2-ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/46B01J23/62B01J32/00B01J35/02B01J21/04B01J35/10C07D213/61B01J35/00
CPCC07D213/61B01J21/04B01J23/462B01J23/52B01J23/626B01J35/615B01J35/635
Inventor 万克柔林涛程杰曾永康曾利辉高武张之翔
Owner XIAN CATALYST NEW MATERIALS CO LTD
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