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Method and device for preparing ammonia

A technology of ammonia gas and absorbent, applied in the direction of ammonia preparation/separation, chemical instruments and methods, ammonia compounds, etc., can solve the problems of high investment and operating costs, and achieve the effect of low operating costs and simple processes

Active Publication Date: 2022-02-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is mature, but requires high temperature or high pressure, and the investment and operation costs are relatively high

Method used

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  • Method and device for preparing ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: a kind of device of the method for preparing ammonia is as figure 1 shown. The gas discharge reaction absorber is straight cylindrical, the material is Hastelloy alloy, the height of the reactor is about 300mm, the inner diameter is about Φ60mm, the size of the central electrode rod is Φ8×300, the material is also alloy, the central electrode rod is connected with the high voltage power supply, and the cylinder body Grounded, the effective length of the gas discharge area is about 150mm. The upper part of the reactor is equipped with an absorption slurry distributor flow guide device, so that the surface of the ground electrode plate on the inner wall of the reactor cylinder forms a uniform absorbent slurry film, and the absorbent is collected by the circulation tank at the lower part of the reactor and then circulated through the circulation pump use.

[0049] The volume ratio of nitrogen and hydrogen in the initial intake air is 1:3, the rest is carrie...

Embodiment 2

[0050] Example 2: In Example 1, the volume ratio of nitrogen and hydrogen in the initial intake air is 9:1 (nitrogen doubles as carrier gas), the electrode power supply mode is changed to DC power supply, the cylinder is grounded, the voltage is about 30kV, and the power supply power is about 50W. Other conditions and operations are basically the same as in Example 1. Experimental results The ammonia conversion rate of nitrogen is about 4%.

Embodiment 3

[0051] Example 3: The reactor electrode is powered by an AC power supply, and the reactor cylinder is connected to the other pole of the AC power supply, with a voltage of about 30kV, a frequency of 50Hz, and a power supply of about 50W. Other conditions are with embodiment 1. Experimental results The ammonia conversion rate of nitrogen is about 5%.

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Abstract

The invention discloses a method and a device for preparing ammonia, and belongs to the field of gas discharge chemical reaction. Nitrogen, hydrogen and carrier gas are introduced into a gas discharge reaction absorber, nitrogen and hydrogen molecules in gas flow are excited under the action of gas discharge in the gas discharge reaction absorber, and a chemical reaction is carried out to generate ammonia; and meanwhile, calcium chloride absorbent slurry is introduced into the gas discharge reaction absorber, so that generated ammonia is absorbed by the absorbent slurry, the absorbent slurry after absorption saturation is sent to a regeneration reactor for desorption regeneration, and ammonia gas generated in the regeneration process is purified and compressed to obtain a liquid nitrogen product. The ammonia is prepared through the reaction of nitrogen and hydrogen by adopting a gas discharge and calcium chloride absorbent slurry absorption coupling method, and the product ammonia is selectively absorbed by adding the calcium chloride absorbent slurry, so that the mass production of the ammonia is realized. Compared with a traditional process, the process is simple, and the operation cost is low.

Description

technical field [0001] The invention belongs to the field of gas discharge chemical reaction, and in particular relates to a method and a device for preparing ammonia. Background technique [0002] Ammonia is an important basic chemical raw material, mainly used as fertilizer, refrigerant and chemical raw material. Ammonia is mainly produced industrially by the Haber process, that is, through the direct combination of nitrogen and hydrogen in the presence of high temperature and high pressure in the presence of a catalyst. This method is mature, but requires high temperature or high pressure, and the investment and operation costs are relatively high. [0003] As an effective method to promote chemical reactions, nonthermal plasma generated by gas discharge has been applied to the degradation and molecular recombination reactions of structurally stable organic substances. The main advantage of this technology is that the reaction can be carried out at normal temperature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/04
CPCC01C1/0494
Inventor 黄立维许祖慧叶青彭杰
Owner ZHEJIANG UNIV OF TECH
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