Method used for preparing ammonia gas from ammonium salt and silicate

A silicate and ammonium salt technology, applied in chemical instruments and methods, ammonia preparation/separation, ammonia compounds, etc., can solve problems such as complex processes, simplify reaction steps, avoid corrosion problems, and facilitate industrial scale-up Effect

Active Publication Date: 2019-07-02
YUANCHU TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the above literatures are only for the decomposition of NH 4 The method of Cl carries out simple description or carries out limited experimental verification, and according to prior art, ammonium chloride must react with acid / alkali compound, and process is complicated, and for utilizing ammonium chloride etc. ammonium salt and silicate directly The method for preparing ammonia by reaction has not been reported

Method used

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  • Method used for preparing ammonia gas from ammonium salt and silicate
  • Method used for preparing ammonia gas from ammonium salt and silicate
  • Method used for preparing ammonia gas from ammonium salt and silicate

Examples

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Embodiment 1

[0041] figure 2It is a schematic diagram of the preparation of ammonia using a fluidized bed in Example 1 of the present invention. A certain amount of granular silicate raw material enters the fluidized bed reactor 10 through the solid feed device 15, and the ammonium salt solution passes through the high-pressure liquefaction pump 14 and the nozzle. Under the action of 16, it reacts with silicate particles in the form of droplets to generate solid matter and ammonia gas. The solid matter is extracted, and a part of it is recycled to mix with fresh silicate particles. Ammonia and water vapor escape into the air with the carrier gas. Solid separation device 11, the separated gas phase containing ammonia is partly drawn out, part of which is recycled to be mixed with fresh carrier gas, preheated by preheater 12, and then enters moving bed reactor 10 through gas distributor 13.

[0042] As a specific example, the total volume of the fluidized bed reactor used in this example is...

Embodiment 2

[0047] image 3 It is a schematic diagram of using a moving bed to prepare ammonia in Example 2. A certain amount of granular silicate raw material enters the moving bed reactor 21 through the solid feed device 25, and moves in a broken line under the action of the baffle plate 20. The high temperature medium Heat is supplied to the system through the heating coil 22, and the aqueous ammonium salt solution contacts and reacts with the silicate particles in the form of droplets under the action of the high-pressure liquefaction pump 23 and the nozzle 24 to generate solid matter and ammonia gas, and the ammonia gas is extracted, and the solid matter is collected out, partly recycled to mix with fresh silicate granules.

[0048] As a specific example, the total volume of the moving bed reactor used in this example is 10L, and the aspect ratio is 20:1, that is, the diameter of the reactor is 0.086 meters, and the height is 1.72 meters. Atomizing nozzles and heating coils (not all...

Embodiment 3

[0053] The equipment and process used in this example are the same as in Example 1, except that this example uses wollastonite with a calcium silicate content of 85% as solid particles, the average particle size of which is 0.8 mm, and ammonium chloride is used as the ammonium salt. The molar ratio of ammonium chloride to calcium silicate is 1:2, air is used as the carrier gas, and the operation is at normal pressure. The air is preheated to 450°C in the preheater, and the hot air volume is 15.4m3 / h (under standard conditions). The working temperature is controlled at 300°C, the temperature of the ammonium chloride solution is 90°C, the mass fraction is 40.8%, the spraying rate is 0.3kg / h, and the circulation rate of 50% of the exhaust gas at the outlet is adjusted. The ratio of the amount used is 1:4 (mass ratio), and the additional amount of wollastonite particles is 0.14kg / h. The reaction results are shown in Table 3:

[0054] Table 3 The results of the reaction between amm...

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Abstract

The invention discloses a method used for preparing ammonia gas from an ammonium salt and a silicate. The preparation method comprises following steps: an ammonium salt aqueous solution is contacted with a high temperature silicate solid granule bed layer in the form of droplets, reaction is carried out on the surfaces of silicate solid granules to generate ammonia gas and a solid substance, the generated ammonia gas is collected, the solid substance is discharged, a part of the solid substrate is mixed with fresh silicate solid granules, and is subjected to reaction with the droplets of the ammonium salt solution. According to the method used for preparing ammonia gas from an ammonium salt and a silicate, ammonia gas can be produced only through one-step reaction in a preparation device,reaction steps are simplified, operation difficulty is reduced, and it is convenient for industrialized amplify production.

Description

technical field [0001] The invention relates to the field of inorganic salt and soda ash chemical industry, in particular to a technology for preparing ammonia gas by utilizing ammonium salt and silicate. Background technique [0002] Ammonium salt refers to the reaction product of ammonia and acid. It is a kind of ionic compound composed of ammonium ions and acid radical ions. Ammonium salt has poor thermal stability. Solid ammonium salt is easy to decompose when heated, and generally decomposes into ammonia and corresponding acid. If the acid is non-volatile, only the ammonia escapes and the acid or acid salt remains in the container. If the corresponding acid is oxidizing, the decomposed ammonia is immediately oxidized. The following is an example of the common ammonium salt - ammonium chloride. [0003] Ammonium chloride, as a by-product of the combined soda production method, is mainly used to produce compound fertilizers. As a nitrogen fertilizer, ammonium chloride o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/02
CPCC01C1/026C01C1/028B01J7/02B01J4/002B01J8/004B01J8/085B01J8/24B01J2208/00292
Inventor 于常军王麒
Owner YUANCHU TECH (BEIJING) CO LTD
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