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A continuous production device and production method for synthesizing 2,2'-bipyridine

A production device and a technology for bipyridine, applied in 2 fields, can solve the problems of low single-pass conversion rate of pyridine, no practical application value, low reaction production efficiency, etc., to facilitate control of reaction conditions, realize high-efficiency production process, and improve stability. and operational safety

Active Publication Date: 2020-09-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the production efficiency of these two kinds of fixed-bed reactors is low, the operation is complicated, the equipment is expensive, and has no practical application value
[0006] In summary, relatively few devices have been reported for the continuous production of direct coupling synthesis of 2,2'-bipyridine, and they all have the disadvantages of low conversion rate of pyridine per pass, low reaction production efficiency, etc. The 2,2'-bipyridine can easily lead to catalyst poisoning, so these devices have no practical industrial production application value

Method used

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  • A continuous production device and production method for synthesizing 2,2'-bipyridine
  • A continuous production device and production method for synthesizing 2,2'-bipyridine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Example 1: Loading method Pd@γ-Al 2 o 3 Metal nanocatalysts catalyze reactions

[0081] (1) Catalyst

[0082] The Pd content in the catalyst is 23%.

[0083] (2) Catalytic synthesis of 2,2'-bipyridine

[0084] Carry out according to aforementioned device and operation process (a), catalyst consumption is 20g. with O 2 The pressure of the reaction system was adjusted to 15Mpa; the temperature of the preheater was 300°C, the reaction temperature was 800°C, and the delivery rate of pyridine was 40ml / min, so that the yield of 2,2'-bipyridine was 5%.

Embodiment 2

[0085] Example 2: Loading method Pd-Cu@γ-Al 2 o 3 Metal nanocatalysts catalyze reactions

[0086] (1) Catalyst

[0087] The Pd content in the catalyst is 23%, Pd:Cu=3:1 (molar ratio).

[0088] (2) Catalytic synthesis of 2,2'-bipyridine

[0089] Carry out according to aforementioned device and operation process (a), catalyst consumption is 20g. with O 2 The pressure of the reaction system was adjusted to 15Mpa; the temperature of the preheater was 300°C, the reaction temperature was 800°C, and the delivery speed of pyridine was 40ml / min, so that the yield of 2,2'-bipyridine was 8%.

Embodiment 3

[0090] Example 3: Loading method Pd-Ni@γ-Al 2 o 3 Metal nanocatalysts catalyze reactions

[0091] (1) Catalyst

[0092] The Pd content in the catalyst is 23%, Pd:Ni=2:1 (molar ratio).

[0093] (2) Catalytic synthesis of 2,2'-bipyridine

[0094] Carry out according to aforementioned device and operation process (a), catalyst consumption is 20g. with O 2 The pressure of the reaction system was adjusted to 15Mpa; the temperature of the preheater was 300°C, the reaction temperature was 800°C, and the delivery speed of pyridine was 40ml / min, so that the yield of 2,2'-bipyridine was 28%.

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Abstract

The invention relates to a continuous production device for synthesizing 2,2'-dipyridyl and a production method. The production device comprises a reaction system, wherein the reaction system comprises a fixed bed reactor for synthesizing 2,2'-dipyridyl from pyridine through direct coupling; a pyridine conveying system and a gas carrying system are connected with the inlet of the fixed bed reactor; a product condensation separation system and a circulation system which is for feeding back unreacted pyridine into the pyridine conveying system are sequentially connected with the outlet of the fixed bed reactor; the product condensation separation system comprises a condenser A and a gas-liquid separator which are arranged in sequence; a membrane separator for separating product hydrogen is mounted at a gas phase outlet of the gas-liquid separator; a recycling system for recycling the product, namely the 2,2'-dipyridyl, is connected with a liquid-phase outlet of the gas-liquid separator;the outlet of the recycling system is connected with the circulation system. By adopting the continuous production device, the conversion per pass of the 2,2'-dipyridyl is greatly increased, high-efficiency production process can be achieved, and a technique is provided for continuous industrial direct-coupling production of 2,2'-dipyridyl.

Description

technical field [0001] The invention belongs to the technical field of 2,2'-bipyridine synthesis, in particular to a continuous production device and production method for synthesizing 2,2'-bipyridine. Background technique [0002] In recent years, the technology of direct coupling synthesis of 2,2'-bipyridine with pyridine has received extensive attention, and a large number of studies have been carried out, but the method of direct coupling synthesis of 2,2'-bipyridine generally has a single-pass conversion rate of It is relatively low, and the production efficiency is also low, and the direct coupling production of 2,2'-bipyridine in a batch tank reactor is limited in industrial application. Therefore, various direct coupling synthesis 2,2'-bipyridine continuous production devices have been reported both at home and abroad. [0003] A variety of direct coupling synthesis 2,2'-bipyridine continuous production devices have been reported at home and abroad, mainly including...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D213/22B01J8/02
CPCB01J8/001B01J8/009B01J8/0285C07D213/22
Inventor 李晓萱贾涛陈威豪冯乙巳王旭东徐卓玮
Owner HEFEI UNIV OF TECH
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