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Method for preparing ammonia gas based on radical chain reaction

A chemical chain and reaction technology, applied in chemical instruments and methods, inorganic chemistry, ammonia preparation/separation, etc., can solve the problems of low preparation efficiency, complex preparation process, high energy consumption, and achieve fast reaction speed, high concentration, high energy consumption, etc. The effect of low energy consumption

Inactive Publication Date: 2018-06-29
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0006] At present, technologies related to ammonia production emerge in endlessly, including hydrogenation of nitrogen in the air, ammonia production from natural gas, ammonia production from heavy oil, and ammonia production from coal (coke). It is further converted into ammonia with nitrogen at high temperature and high pressure by the Hubble method. The preparation process is complicated, the energy consumption is high, and the preparation efficiency is low.

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  • Method for preparing ammonia gas based on radical chain reaction
  • Method for preparing ammonia gas based on radical chain reaction
  • Method for preparing ammonia gas based on radical chain reaction

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Embodiment 1

[0033] Coal, alumina, and calcium fluoride are continuously fed into the nitrogen absorption reactor 2 at a ratio of molar mass flow rate of 3:1:0.2, the temperature is maintained at 1400°C, the operation mode is a bubbling bed, and the fluidizing gas is nitrogen. After the carbon thermal reduction reaction of alumina, the chemical energy of coal char is transferred to aluminum nitride, and then the aluminum nitride is transported to the nitrogen release reactor 1. The temperature of the reactor is raised to 1200 ° C, and the operation mode adopts bubbling bed , the fluidization gas is water vapor, and the chemical energy of aluminum nitride is converted into ammonia gas after the nitrogen release reaction to generate high-concentration ammonia gas. The conversion rate of aluminum nitride during the nitrogen release process can reach 37.27%, such as figure 2 shown.

Embodiment 2

[0035] Coal, alumina, and calcium fluoride are continuously fed into the nitrogen absorption reactor 2 at a ratio of molar mass flow rate of 3:1:0.2, the temperature is maintained at 1400°C, the operation mode is a bubbling bed, and the fluidizing gas is nitrogen. After the carbon thermal reduction reaction of alumina, the chemical energy of coal char is transferred to aluminum nitride, and then the aluminum nitride is transported to the nitrogen release reactor 1 to be mixed with magnesium oxide, wherein the mass ratio of magnesium oxide to aluminum nitride is 5 : 95, the temperature of the reactor rises to 1200°C, the operation mode adopts bubbling bed, the fluidization gas is water vapor, and the chemical energy of aluminum nitride is converted into ammonia gas after the nitrogen release reaction to generate high-concentration ammonia gas, which releases The conversion rate of aluminum nitride in the nitrogen process can reach 72.42%, such as figure 2 shown.

Embodiment 3

[0037] Coal, alumina, and calcium fluoride are continuously fed into the nitrogen absorption reactor 2 at a ratio of molar mass flow rate of 3:1:0.2, the temperature is maintained at 1400°C, the operation mode is a bubbling bed, and the fluidizing gas is nitrogen. After the carbon thermal reduction reaction of alumina, the chemical energy of coal char is transferred to aluminum nitride, and then the aluminum nitride is transported to the nitrogen release reactor 1 to be mixed with iron oxide, wherein the mass ratio of iron oxide to aluminum nitride is 5 : 95, the temperature of the reactor rises to 1200°C, the operation mode adopts bubbling bed, the fluidization gas is water vapor, and the chemical energy of aluminum nitride is converted into ammonia gas after the nitrogen release reaction to generate high-concentration ammonia gas, which releases The conversion rate of aluminum nitride in the nitrogen process can reach 90.51%, such as figure 2 shown.

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Abstract

The invention provides a method for preparing ammonia gas based on radical chain reaction. The method mainly comprises the following steps: preparing aluminum nitride as a nitrogen carrier; uniformlymixing aluminum oxide, an activated carbon source and corresponding catalyst which is calcium fluoride based on the molar mass of 1: 3: 0.2 through a carbothermic method; transferring into nitrogen absorption reaction; increasing the temperature to reach 1200-1800 DEG C; charging nitrogen to generate aluminum nitride and synthesized gas; exhausting the synthesized gas which is separated through acyclone separator from the upper end; mixing aluminum nitride and the catalyst; feeding the mixture into nitrogen releasing reaction gas; maintaining the temperature to 900-1200 DEG C; charging watervapor to react with aluminum nitride so as to prepare ammonia gas and aluminum oxide; separating through the cyclone separator to obtain high-purity ammonia gas; and transferring the separated aluminum oxide into a nitrogen adsorption reactor for recycling. The method is high in ammonia gas preparation efficiency, and simple in equipment, and is an optimal scheme with low investment and low energyconsumption.

Description

technical field [0001] The invention relates to a method for preparing ammonia gas based on chemical chain reaction, and belongs to the technical field of energy application of chemical chain reaction. Background technique [0002] The greenhouse effect and its impact have increasingly become the focus of worldwide attention. Among them, CO 2 The massive emission of greenhouse gases is the main reason for the increasing greenhouse effect. cause CO 2 The main reason for the large amount of emissions is the burning of carbon-containing fuels. With the rapid development of my country's economy, energy consumption will continue to increase. As a responsible big country, my country will face greater international pressure. Therefore, it is imminent to actively explore and find clean energy. [0003] Ammonia, its hydrogen carrying capacity is second only to methane, but the combustion reaction of ammonia is: [0004] NH 3 +O 2 =N 2 +H 2 o [0005] Generate nitrogen and w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/02C01B3/02
CPCC01C1/026C01B3/02
Inventor 吴烨赵文文高原刘岩刘冬蒋波温成
Owner NANJING UNIV OF SCI & TECH
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