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Method for preparing hydrochloric acid and ammonia sulfate by decomposing ammonium chloride in sulfuric acid medium

A technology of ammonium chloride and ammonium sulfate, applied in the field of salt chemical industry, can solve the problems of unutilized resource chlorine, harsh operating conditions, difficult industrialization, etc., and achieve deep development and utilization, high utilization value of finished products, and low investment cost. Effect

Inactive Publication Date: 2009-07-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] From the above-mentioned documents, there are still serious drawbacks in the current industrial method for treating ammonium chloride: one is that the method produces a large amount of calcium chloride and is discharged, seriously polluting the local environment; the other is that the chlorine in the resource is not utilized
On the other hand, although scholars at home and abroad have carried out active research work on the decomposition of ammonium chloride and made some progress, most of the various new methods reported in the literature have high energy consumption in the process and relatively harsh operating conditions, and there are still problems in realizing industrialization. many difficulties

Method used

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  • Method for preparing hydrochloric acid and ammonia sulfate by decomposing ammonium chloride in sulfuric acid medium
  • Method for preparing hydrochloric acid and ammonia sulfate by decomposing ammonium chloride in sulfuric acid medium
  • Method for preparing hydrochloric acid and ammonia sulfate by decomposing ammonium chloride in sulfuric acid medium

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Effect test

Embodiment 1

[0034] See figure 1 . Take by weighing 48.03g ammonium chloride and join concentration and be dissolved in the sulfuric acid medium of 20wt%, the mol ratio of sulfuric acid and ammonium chloride is 0.5; The mixed solution (mother liquor 1) that will prepare is dropped in the reactor, heat up until solution boils At this time, a large amount of steam is generated, which is sent into the condenser through the conduit to condense, and the condensate is hydrochloric acid; pipette 10mL of the collected hydrochloric acid solution, and use a concentration of 0.1mol / L sodium hydroxide standard solution to titrate and determine the concentration of hydrochloric acid. 3.95mol / L, the recovery rate of HCl reaches 60%; The bottom liquid crystallizes and separates out ammonium bisulfate at room temperature, filters and obtains crude product ammonium bisulfate, and can obtain ammonium bisulfate product through refining; Prepared ammonium bisulfate Concentration is the solution (mother liquo...

Embodiment 2

[0036] See figure 1 . Take by weighing 145.17g ammonium chloride and join concentration and be dissolved in the sulfuric acid medium of 60wt%, the mol ratio of sulfuric acid and ammonium chloride is 1.0; The mixed solution (mother liquor I) that will prepare is dropped in the reactor, normal pressure (1atm ), heat up until the mixed solution boils, the temperature is 80°C, at this time there are a lot of HCl and H 2 The vapor composed of O is generated to keep the solution in a boiling state; the HCl and H 2 The steam composed of O is sent into the condenser through the conduit to condense, and the condensate is hydrochloric acid; pipette 10mL of the collected hydrochloric acid solution, and use the sodium hydroxide standard solution with a concentration of 0.1mol / L to titrate and measure the concentration of hydrochloric acid to be 12mol / L, The recovery rate of HCl reaches 96%; The bottom liquid crystallizes at room temperature (20 ℃) ​​for 5 hours and separates out ammoniu...

Embodiment 3

[0038] See figure 1 . Take by weighing 205.95g ammonium chloride and join in concentration and be dissolved in the sulfuric acid medium of 80wt%, the mol ratio of sulfuric acid and ammonium chloride is 2.5; The mixed solution (mother liquor I) that will prepare is dropped in the reactor, normal pressure (1atm) Next, raise the temperature until the mixed solution boils, the temperature is 110°C, at this time there are a lot of HCl and H 2 The steam composed of O is generated, the condenser tube condenses, and the condensate is hydrochloric acid; pipette 10mL of the collected hydrochloric acid solution, and use a sodium hydroxide standard solution with a concentration of 0.1mol / L to titrate and determine that the concentration of hydrochloric acid is 12mol / L, and the recovery of HCl The rate reaches 99%; the liquid at the bottom of the kettle is cooled to precipitate crystals, the crystallization temperature is 25°C, and the crystallization time is 3 hours. The separated and fi...

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Abstract

The invention pertains to the field of salt chemical engineering, more particularly relates to a method for resolving ammonium chloride in a sulfuric acid medium for preparing chlorhydric acid and ammonium sulphate. The technical proposal of the invention is as follows: ammonium chloride which a byproduct during the development process of magnesium resources in chlor-alkali industry or salt lake is taken as a raw material and sulphuric acid is taken as a medium to produce chlorhydric acid and ammonium sulphate by a two-step method. High-concentration chlorhydric acid and high-purity ammonium sulphate can be obtained by controlling the technical conditions. The method has strong operability, is easy to be industrialized, and can realize the deep all-component utilization of salt lake resources and the effective transfer of the ammonium chloride which is the byproduct of the chlor-alkali industry.

Description

technical field [0001] The invention belongs to the field of salt chemical industry, in particular to a method for preparing hydrochloric acid and ammonium sulfate by decomposing ammonium chloride in a sulfuric acid medium. technical background [0002] With the development of the soda-making industry, the output of the by-product ammonium chloride has been increasing year by year, and the phenomenon of oversupply has already appeared. Furthermore, ammonium chloride products in my country are mainly used as one of the nitrogen fertilizers, but ammonium chloride is not a high-quality chemical fertilizer. It will lead to the enrichment of chlorine in the soil, and cause poor soil dispersion and soil viscosity, and also cause plant formation. Salt damage. Recently, according to the literature [Wang Y, Li Z.Controlled precipitation ofnesquehonite (MgCO 3 ·3H 2 O) by the reaction of MgCl 2 with(NH 4 ) 2 CO 3 at 303K.Light Metals in Transport Applications[C].46 th Ammual ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/246C01B7/01
Inventor 李志宝肖清贵
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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