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Process for preparing ammonia by utilizing calcium oxide

A calcium oxide and process technology, applied in the chemical industry, sustainable manufacturing/processing, ammonia preparation/separation, etc., can solve problems such as unsuitable small-scale ammonia production, and achieve the effects of small investment, energy saving, and simple process flow

Inactive Publication Date: 2014-04-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Calcium hydroxide (solid) + ammonium chloride (solid) can be used for laboratory ammonia production, but it is not suitable for small-scale ammonia production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Adopt fed-batch + segmentation process, with an annual output of 500 tons of ammonia and 300 working days per year. 7m 3 Reactor, add water 4.8m into the reactor 3 , adding ammonium chloride to obtain a concentration of 500kg / m 3 Part of the ammonium chloride solution was not dissolved, and then calcium oxide powder (content 90%) and ammonium chloride granules (content 97%) were added at the same time, and the adding speed of calcium oxide powder and ammonium chloride granules was 127.04kg / h respectively and 224.85kg / h. The reaction starts, and the top of the reactor is discharged to produce ammonia, 68-70kg / h. Reactor temperature 80 DEG C, react 24h, when calcium chloride concentration is close to saturation in the reactor, carry out segmentation operation, stop adding ammonium chloride, continue reaction, make the ammonium chloride concentration reduce in the reaction solution, stop adding calcium oxide, 80% of the reaction solution was discharged. Start a new op...

Embodiment 2

[0024] Continuous process is adopted, with an annual output of 500 tons of ammonia and an annual working day of 300 days. 1m 3 Reactor, add water 0.75m into the reactor 3 , adding ammonium chloride to obtain a concentration of 500kg / m 3 Ammonium chloride solution, add calcium oxide, after the reaction is stable, add calcium oxide powder (content 90%), ammonium chloride granules (content 97%) and water at the same time, add calcium oxide powder, ammonium chloride granules and water The speeds are 127.04kg / h, 224.85kg / h and 37.7kg / h respectively. Reactor temperature 70 DEG C, meanwhile, begin to filter and discharge reaction liquid, discharge speed and feed material amount balance, make reactor liquid level stable. The ammonia generated from the top of the reaction kettle is discharged, 68-70kg / h. The reaction solution discharged from the reaction kettle is spray-dried to obtain a calcium chloride product. The dry waste gas contains ammonia, which needs to be removed.

Embodiment 3

[0026] Adopt fed-batch + segmentation process, with an annual output of 1,000 tons of ammonia and 300 working days per year. 13m 3 Reactor, add water 9.6m into the reactor 3 , adding ammonium chloride to obtain a concentration of 200kg / m 3 ammonium chloride solution (partially undissolved), then, add calcium oxide powder (content 90%) and ammonium chloride granule (content 97%) simultaneously, the adding speed of calcium oxide powder and ammonium chloride granule is respectively 228.67kg / h and 436.21kg / h. Reactor temperature 60 ℃, reaction begins, and the ammonia that reactor top discharges produces, 135-143kg / h. React for 24 hours, when the concentration of calcium chloride in the reaction kettle is close to saturation, carry out split operation, stop adding ammonium chloride, continue the reaction, reduce the concentration of ammonium chloride in the reaction solution, stop adding calcium oxide, and discharge 80% of the reaction solution. Start a new operation cycle, ad...

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Abstract

The invention discloses a process for preparing ammonia by utilizing calcium oxide. The process is simple, has low investment, is energy-saving and is very suitable for enterprises which need to be supplied with a small amount of ammonia. The ammonia can be prepared by respectively adopting a feeding and cutting process and a continuous process.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a process for preparing ammonia by reacting calcium oxide and ammonium chloride solution. The process is simple and the investment is small. Background technique [0002] Ammonia, inorganic compound, chemical formula: NH3; gas at room temperature, colorless with pungent odor, easily soluble in water. In the chemical industry, ammonia is produced by the direct combination of N2 and H2 in the presence of a catalyst under high temperature and pressure in the Haber process. This ammonia production method is suitable for industrial large-scale production, such as tens of thousands of tons, hundreds of thousands of tons per year. However, sometimes, small-scale ammonia production is required industrially, for example, 500-5000 tons / year. At this time, Haber's law is obviously not applicable. [0003] Calcium hydroxide (solid) + ammonium chloride (solid) can be used for laboratory am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/02
CPCY02P20/50
Inventor 刘均洪张媛媛
Owner QINGDAO UNIV OF SCI & TECH