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Method for combined production of ammonia and basic calcium chloride by decomposing ammonium chloride

A technology of ammonium chloride and calcium chloride, applied in the direction of calcium/strontium/barium chloride, ammonia preparation/separation, calcium/strontium/barium halide, etc., which can solve transportation difficulties, slow reaction speed, and large heat consumption and other problems, to achieve the effect of simple process, high conversion rate and low energy consumption

Inactive Publication Date: 2011-01-12
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The decomposition method of ammonium chloride introduced in this patent requires heating and consumes a large amount of heat energy. The released hydrogen chloride gas is poisonous and harmful, and it is difficult to transport and comprehensively utilize. Since magnesium oxide is used as the reaction medium, the reaction The activity is relatively low, so the reaction rate is relatively slow

Method used

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  • Method for combined production of ammonia and basic calcium chloride by decomposing ammonium chloride
  • Method for combined production of ammonia and basic calcium chloride by decomposing ammonium chloride
  • Method for combined production of ammonia and basic calcium chloride by decomposing ammonium chloride

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Embodiment 1

[0027] Put 56g of calcium oxide with a particle size of 5mm in diameter and 53g of ammonium chloride into the pulverizer at the same time. The pulverizer model is SL-30. The pulverizer is turned on and the pulverization time is 60 minutes. Such as figure 1 shown. As can be seen from the figure, as the crushing time increases, the decomposition rate of ammonium chloride increases, and when the crushing time reaches 60 minutes, the decomposition rate of ammonium chloride reaches 99.5%. figure 2 It is the X-ray powder diffraction pattern of the solid product basic calcium chloride. Compared with the standard spectrum, it can be seen that the reaction between ammonium chloride and calcium oxide is basically completed, and it is completely converted into basic calcium chloride.

[0028] image 3 It is a scanning electron micrograph of the product basic calcium chloride. It can be seen from the figure that its particle size is about 100 nanometers.

Embodiment 2

[0030] Put 100g of calcium hydroxide and 71.62g of ammonium chloride with a particle size of 10mm in diameter into the ball mill at the same time, turn on the ball mill, and the ball milling time is 80 minutes. The ammonium chloride decomposition rate varies with the pulverization time as follows: Figure 4 shown. As can be seen from the figure, as the crushing time increases, the decomposition rate of ammonium chloride increases, and when the crushing time reaches 80 minutes, the decomposition rate of ammonium chloride reaches 99%. Figure 5 It is the X-ray powder diffraction pattern of the solid product basic calcium chloride. Compared with the standard spectrogram, it can be seen that the reaction between ammonium chloride and calcium hydroxide is basically complete, and it is completely converted into basic calcium chloride.

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Abstract

The invention provides a method for the combined production of ammonia and basic calcium chloride by decomposing ammonium chloride, which comprises the following steps: grinding or crushing calcareous materials and ammonium chloride according to a mol ratio of 1:0.5-2 in a ball grinder or a crusher at -20-200 DEG C, enabling the calcareous materials and the ammonium chloride to be subject to a chemical reaction to decompose the ammonium chloride so as to release ammonia gas and generate basic calcium chloride. The invention fully uses the large amount of ammonium chloride as the byproducts of the combined soda process and the ammonia soda process, realizes the recycling of ammonia and generates the basic calcium chloride as the byproduct. The invention has the characteristics of simple process, low investment, high conversion rate, no pollution and low energy consumption, is applicable to industrial production and meets the requirements green chemical development in the present society.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for decomposing ammonium chloride to produce ammonia and co-produce basic calcium chloride. Background technique [0002] In the process of producing soda ash by combined alkali method, a large amount of solid ammonium chloride is produced by-product. In the process of producing soda ash by the ammonia-soda method, the by-product ammonium chloride solution reacts chemically with the calcium hydroxide suspension. Through the ammonia distillation process, the ammonia is recycled, and the by-product calcium chloride aqueous solution, a small part of the calcium chloride solution, Through evaporation, the calcium chloride solid product is obtained, and a large amount of calcium chloride aqueous solution is discharged into the sea, seriously polluting the environment. In the process of using magnesium chloride as raw material to produce magnesium hydroxide by amm...

Claims

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Application Information

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IPC IPC(8): C01C1/02C01F11/24
Inventor 刘润静胡永琪赵华赵凤云赵晓凤
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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