High-selectivity preparation method of pyrrole compounds

A high-selectivity, compound technology, applied in the direction of organic chemistry, can solve the problems of waste loss, resource waste, environmental pollution, etc., and achieve the effect of avoiding pre-treatment steps, reducing corrosion and pollution, and low cost

Active Publication Date: 2014-02-05
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, waste protein, municipal organic waste and other wastes are lost in large quantities and

Method used

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  • High-selectivity preparation method of pyrrole compounds
  • High-selectivity preparation method of pyrrole compounds
  • High-selectivity preparation method of pyrrole compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In this example, a quartz tubular reactor with a diameter of 34 mm and a length of 300 mm was used. In the reactor, the catalyst was supported by quartz wool. Install the quartz reactor in a temperature-controlled furnace. During operation, ammonia gas was used as a carrier gas, and its flow rate was controlled by a gas flow meter. The carrier gas used in this experiment was NH 3 or NH 3 / N 2 , NH 3 / He mixture. The powdery raw materials flow together with the carrier gas flow from the opening of the quartz tube to the pyrolysis interface. 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.

[0049] As representative of several embodiments, the catalytic pyrolysis tests described in Examples 1-4 were performed with powdered catalyst and feed (<140 mesh). Unless otherwise stated in this example, the reaction conditions were as describe...

Embodiment 2

[0054] In this example, 6 different catalysts were tested for the catalytic pyrolysis of cellulose, including: TiO 2 / SO 4 2- , SnO 2 / SO 4 2- , MnO 2 / SO 4 2- , SiO 2 / 5O 4 2- , ZnCl 2 , FeCl 3 , BF 3 ,C-SO 3 H. The powder reactant was prepared by physically mixing carbohydrate feed and catalyst. In this experiment, the ratio of catalyst to glucose was 2, the reaction temperature was 550°C, and the gas flow rate was 200ml / min. The catalyst was mixed with cellulose and ground into powder.

[0055]

Embodiment 3

[0057] In this example, the organic material was impregnated with liquid acids of different concentrations and volumes, and then filtered, dried and pulverized. Then, the treated organic material containing acid is subjected to a pyrolysis experiment at a certain temperature, and the liquid is collected to obtain bio-oil containing pyrrole compounds. The bio-oil was collected and quantified by gas phase detection. Taking bagasse as an example in this embodiment, it is proved that the suitable acid concentration has a very important influence on the yield of pyrrole compounds, and the suitable acid concentration is 0.01M-18M. It can be seen from Comparative Example 3.1 that when the acid concentration is too high or too low, the yield of pyrrole compounds drops significantly.

[0058]

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Abstract

The invention relates to a high-selectivity preparation method of pyrrole compounds, which comprises the following steps: feeding organic materials and an acidic catalyst into a reactor; and reacting the organic materials in the reactor in the presence of gas containing reactive nitrogen compounds under heating conditions under the action of the catalyst, thereby generating a reaction system stream comprising one or more nitrogenous aromatic compounds, wherein the selectivity of the pyrrole compounds is up to higher than 80%.

Description

technical field [0001] The invention relates to the field of organic matter preparation, in particular to a method for preparing pyrrole compounds with high selectivity. Background technique [0002] Biomass carbohydrates are the most abundant and widely distributed organic compounds in nature. They are mainly composed of carbon, hydrogen, and oxygen. Glucose, sucrose, starch, and cellulose are all sugar compounds. With the increasing consumption and pollution of coal and oil resources around the world, people's need to find a renewable and clean energy source is becoming more and more urgent. Compared with fossil energy, biomass energy has the characteristics of wide distribution, large amount, no pollution and renewable. In addition, waste protein, urban organic waste and other wastes are lost in large quantities and have not been effectively utilized, resulting in a great waste of resources and environmental pollution. Biomass resources are the only sustainable source o...

Claims

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Application Information

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IPC IPC(8): C07D207/323
CPCC07D207/323
Inventor 张颖徐禄江姚倩
Owner UNIV OF SCI & TECH OF CHINA
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