Method for preparing pyridine compounds from polyol compounds

A technology of polyol compounds and polyols, applied in the direction of organic chemistry, can solve problems such as difficult to meet market demand, achieve the effects of reducing corrosion and pollution, avoiding pretreatment steps, and low cost

Active Publication Date: 2014-08-13
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the increasing demand for pyridine derivatives, the method of recovering and separati

Method used

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  • Method for preparing pyridine compounds from polyol compounds
  • Method for preparing pyridine compounds from polyol compounds
  • Method for preparing pyridine compounds from polyol compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, a quartz tubular reactor with a diameter of 10 mm and a length of 250 mm was used. Loading H-ZSM-5 catalyst (SiO 2 :Al 2 o 3 =25-200) to produce a fixed bed supported by quartz wool. Install the quartz reactor in a temperature-controlled furnace. Reactor temperature was monitored by thermocouples inserted into the surface of the temperature-controlled furnace packed bed.

[0036] During operation, the raw material is a polyol compound, and a reactive nitrogen compound is used as a carrier gas, and its flow rate is controlled by a flow meter. The liquid feedstock was introduced into the carrier gas by a syringe pump and transported to the reactor. The reaction temperature is 200-800°C, and the flow rate of the carrier gas is 5-200ml / min. Liquid products flow from the reactor to the condenser and gaseous products are collected in gas sampling bags. Liquid and gaseous products were analyzed using a gas chromatograph.

[0037]As representative of se...

Embodiment 2

[0041] Introduce the liquid raw material into the carrier gas through the syringe pump, test ethylene glycol, glycerol, 1,2-propanediol, 1,3-propanediol, 1,2,3-butanetriol, butylene glycol, pentapentyl pentaol, hexyl Yields of pyridines produced by catalytic pyrolysis of different starting materials such as hexaols. Table 1 shows that the liquid products are essentially pyridines.

[0042]

[0043] Reaction conditions: the reaction temperature is 500°C, the catalyst is H-ZSM-5 (SiO 2 :Al 2 o 3 =25), consumption is 1g, WHSV=1, ammonia gas flow=40ml / min.

Embodiment 3

[0045] This example studies the effect of reaction temperature on product yield. Table 2 shows that the yield of pyridine compounds will increase with the increase of temperature, but the continuous increase will make the yield of pyridine compounds decrease. And when the temperature is above 500°C, the selectivity of pyridine compounds decreases with the increase of temperature.

[0046]

[0047] Reaction conditions: the reaction raw material is glycerol, the catalyst is H-ZSM-5 (SiO 2 :Al 2 o 3 =25), consumption is 1g, WHSV=1, ammonia gas flow=40ml / min.

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Abstract

The invention provides a method for preparing pyridine compounds from polyol compounds. The method comprises the following steps: in the existence of a reactive nitrogen compound-containing gas, and under the condition of heating, a polyol compound stream is reacted under the catalysis of a catalyst, so that a reaction system stream containing one or more pyridine compounds is produced.

Description

technical field [0001] The invention relates to the field of organic matter preparation, in particular to a method for preparing pyridine compounds from polyol compounds. Background technique [0002] Pyridine and alkylpyridine are six-membered ring compounds containing a nitrogen atom. Usually, pyridine and its derivatives are collectively referred to as pyridine base compounds, mainly including pyridine, 2-picoline, 3-picoline, 4-methylpyridine pyridine etc. Pyridine and its derivatives are very important chemical intermediates, widely used in medicine, pesticide, feed, synthetic rubber and printing and dyeing industries, and can also be used in the production of surfactants and food additives. Industrially, pyridine is mainly used in the production of sulfonamides, penicillin, vitamin A, cortisone, anthelmintics and local anesthetics, etc. It can also be used in stabilizers, softeners, paint solvents, condensation agents for synthetic resins, and for the synthesis of wee...

Claims

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Application Information

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IPC IPC(8): C07D213/14C07D213/16
CPCC07D213/09C07D213/16
Inventor 张颖徐禄江姚倩韩铮
Owner UNIV OF SCI & TECH OF CHINA
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