A method for preparing pyridine base compounds by catalyzing the ammoniation of glycerol
A technology for catalyzing glycerol and pyridine bases, applied in chemical instruments and methods, molecular sieve catalysts, chemical/physical processes, etc., can solve the problems of high difficulty in product separation and purification, high cost of raw material sources, unsuitable for industrial production, etc. Inexpensive, improved economic viability, easy separation effects
Active Publication Date: 2017-09-29
HEBEI UNIV OF TECH
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Problems solved by technology
The method of obtaining pyridine bases was separated from coal tar and bone oil by Anderson in the early stage. However, due to the high difficulty of product separation and purification and high production costs, it is not suitable for industrial production, so it is gradually replaced by synthetic methods.
In 1924, Chichibabin proposed the reaction route of synthesizing pyridine base compounds with aldehyde and ammonia as raw materials, which has been used and the reaction has been continuously optimized and achieved a relatively ideal yield level, but the cost of raw material sources is relatively high
Method used
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Embodiment Construction
[0014] Below in conjunction with specific example, the catalyst prepared by the present invention is described in detail:
[0015] Implementation Example 1: Preparation of Catalyst Cu / HZSM-5 by Impregnation Method
[0016] 4.83g Cu(NO 3 ) 2 ·3H 2 O was dissolved in 12 mL of distilled water, and 20 g of strip-shaped HZSM-5 molecular sieves were added, stirred evenly, impregnated at room temperature for 24 hours, dried in a drying oven at 110 °C for 10 h, and roasted in a muffle furnace at 550 °C for 5 h in an air atmosphere. obtain the required catalyst. The size of the catalyst is 4 mesh to 20 mesh; the mass percentage of the active component CuO in the catalyst to the total mass of the catalyst is 7.37%.
[0017] Implementation Example 2: Catalyst Pb / HZSM-5 Prepared by Kneading and Extruding
[0018] 1.45g Pb(NO 3 ) 2 Dissolve in 14mL of distilled water, add 20g of HZSM-5 powder, stir evenly, fully grind until completely mixed, extruded, dried in a drying oven at 110°C...
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The invention discloses a method for preparing pyridine base compounds through catalyzing ammoniation of glycerin. The method comprises the following steps of vaporizing a glycerin water solution and ammonia gas by heating, and mixing the glycerin water solution and the ammonia gas, and then, enabling the mixture to enter a fixed bed reactor to react at normal pressure and the temperature of 270-550 DEG C, wherein the molar ratio of glycerin to the ammonia gas is 1:(3-11), and the volume space velocity that a mixed gas of the glycerin water solution and the ammonia gas passes through a catalyst bed layer is 200-1800h<-1>; and carrying out ammoniation cyclization under the action of a catalyst to generate the pyridine base compounds, wherein the pyridine base compounds include pyridine, 2-methylpyridine and 3-methylpyridine. The invention provides a novel method for synthesizing the pyridine base compounds by using glycerin; due to the adoption of the method, cheap industrial excessive resources can be converted into the pyridine base compounds with relatively high values; the catalyst is simple in preparation, cheap and available; and the reaction raw materials are cheap, little wastewater, waste gas and waste residue are generated and pollution is avoided.
Description
technical field [0001] The invention relates to a preparation technology of pyridine, 2-picoline and 3-picoline, which are commonly used compounds in the chemical industry, in particular to a method for preparing pyridine, 2-picoline and 3-methylpyridine by catalyzing the ammoniation of glycerol. The pyridine method and its catalyst. Background technique [0002] "Green energy" biodiesel, as a clean and sustainable energy source, has become a high-quality substitute for petroleum diesel, which has attracted more and more attention from the world's energy industry. The biodiesel obtained through transesterification is accompanied by the generation of a large amount of by-product glycerol. Exploring the downstream use of the excess by-product glycerol has become the key point for the effective utilization of energy in the biodiesel industry and the realization of economic feasibility. At present, the comprehensive utilization of glycerin is mainly through glycerol biodegradat...
Claims
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IPC IPC(8): C07D213/09C07D213/16B01J29/46B01J29/40B01J29/76B01J21/06B01J29/18B01J23/755B01J29/44B01J23/745B01J29/48B01J23/02B01J29/24
CPCB01J21/063B01J23/02B01J23/745B01J23/755B01J29/185B01J29/24B01J29/405B01J29/44B01J29/46B01J29/48B01J29/7615C07D213/09C07D213/16
Inventor 张月成赵继全颜翔赵晓甫翟星
Owner HEBEI UNIV OF TECH