Reutilization method of by-product ammonium chloride from ammonia process to produce magnesium hydroxide

A technology of magnesium hydroxide and ammonium chloride, applied in organic chemistry and other directions, can solve the problems of low recycling rate, difficulty in compressing magnesium hydroxide, and high energy consumption

Inactive Publication Date: 2016-02-03
QINGHAI SALT LAKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recovery and reuse process has complex water removal procedures, high energy consumption, high investment and operating costs, it is difficult to compress into liquid ammonia for recycling to produce magnesium hydroxide, and the recovery and reuse rate is low

Method used

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  • Reutilization method of by-product ammonium chloride from ammonia process to produce magnesium hydroxide
  • Reutilization method of by-product ammonium chloride from ammonia process to produce magnesium hydroxide
  • Reutilization method of by-product ammonium chloride from ammonia process to produce magnesium hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0033] like figure 1 As shown, first enter into S1100 collection step: collect the by-product ammonium chloride generated by the reaction of magnesium chloride solution and liquid ammonia. Then enter step S1200 to distill ammonia: the calcium oxide and the ammonium chloride collected in step S1100 are used to distill ammonia to produce ammonia gas. In this ammonia distillation step, the stirring speed is 90 rpm, the temperature is 30° C., the pressure in the ammonia distillation kettle is maintained at 50 Pa, and the ammonia distillation time is controlled at 85 minutes. Then enter the condensation reaction step S1300: react the ammonia gas prepared in step S1200 with formaldehyde to form a reaction liquid. Wherein, the reaction temperature is 50° C., the reaction pressure is 0.2 MPa, and the pH value of the reaction solution is controlled at 8. Then enter into S1400 concentration step: evaporate the reaction liquid to form a high-concentration reaction liquid. In this step...

Embodiment 2

[0035] like figure 1 As shown, first enter into S1100 collection step: collect the by-product ammonium chloride generated by the reaction of magnesium chloride solution and liquid ammonia. Then enter step S1200 for distilling ammonia: the calcium chloride and the ammonium chloride collected in step S1100 are used to distill ammonia to produce ammonia gas. In this ammonia distillation step, the stirring speed is 95 rpm, the temperature is 105° C., the pressure in the ammonia distillation kettle is maintained at 55 kPa, and the ammonia distillation time is controlled at 90 minutes. Then enter the condensation reaction step S1300: react the ammonia gas prepared in step S1200 with formaldehyde to form a reaction liquid. Wherein, the reaction temperature is 70° C., the reaction pressure is 0.25 MPa, and the pH value of the reaction solution is controlled at 9. Then enter into S1400 concentration step: evaporate the reaction liquid to form a high-concentration reaction liquid. In...

Embodiment 3

[0037] like figure 1As shown, first enter into S1100 collection step: collect the by-product ammonium chloride generated by the reaction of magnesium chloride solution and liquid ammonia. Then enter step S1200 to distill ammonia: the calcium oxide and the ammonium chloride collected in step S1100 are used to distill ammonia to produce ammonia gas. In this ammonia distillation step, the stirring speed is 92 rpm, the temperature is 70° C., the pressure in the ammonia distillation kettle is maintained at 52 kPa, and the ammonia distillation time is controlled at 88 minutes. Then enter the condensation reaction step S1300: react the ammonia gas prepared in step S1200 with formaldehyde to form a reaction liquid. Wherein, the reaction temperature is 60° C., the reaction pressure is 0.23 MPa, and the pH value of the reaction solution is controlled at 8.5. Then enter into S1400 concentration step: evaporate the reaction liquid to form a high-concentration reaction liquid. In this s...

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Abstract

The invention discloses a reutilization method of a by-product ammonium chloride from ammonia process to produce magnesium hydroxide. The comprises the following steps: (S1100) collecting by-product ammonium chloride generated from reaction of magnesium chloride and liquid ammonia; (S1200) ammonia distillation: preparing ammonia from calcium oxide and the ammonium chloride collected in (S1100) through an ammonia evaporation process; (S1300) condensation reaction: reacting ammonia obtained in the (S1200) and formaldehyde to prepare a a reaction solution; (S1400) concentration: evaporating the reaction liquid to form a reaction solution of high concentration; and (S1500) dehumidification: drying the reaction solution of high concentration to obtain a urotropine finished product. The reutilization method of by-product ammonium chloride from ammonia process to produce magnesium hydroxide at least can effectively recycle and use the by-product ammonium chloride from ammonia process to produce magnesium hydroxide.

Description

technical field [0001] The invention relates to a method for reusing ammonium chloride, a by-product of an ammonia-based magnesium hydroxide process, in particular to a method for reusing the by-product ammonium chloride in a urotropine process. Background technique [0002] The ammonia-based magnesium hydroxide process in the prior art adopts the reaction of magnesium chloride and liquid ammonia to generate magnesium hydroxide, and ammonium chloride will be produced as a by-product in this process. In order to recycle and reuse ammonium chloride, ammonium chloride is generally compressed into liquid ammonia and recycled to produce magnesium hydroxide after undergoing ammonia distillation and purification processes. However, the recovery and reuse process has complex water removal procedures, high energy consumption, high investment and operating costs, it is difficult to compress into liquid ammonia for recycling to produce magnesium hydroxide, and the recovery and reuse ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D487/18
CPCC07D487/18
Inventor 海吉忠李生廷王树龙李建业侯元昇张义勇甘仁香史忠录胡晓英刘海平傅铃麟
Owner QINGHAI SALT LAKE IND
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