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Method for decomposing chloride and releasing hydrogen chloride by using non-volatile acid or acidic salt

A non-volatile acid and acid salt technology, which is applied in the direction of chlorine/hydrogen chloride and chloride preparation, etc., can solve the problems of high crystal size requirements for raw materials, low decomposition rate of ammonium chloride, and difficult heat transfer, etc., and achieve atomic The effect of high utilization rate, low price and simple process route

Inactive Publication Date: 2008-08-27
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline solvent complexation two-stage process is typical: magnesium process, iron process, calcium process, etc. These processes can realize the recovery and utilization of hydrogen chloride and ammonia in ammonium chloride, but they are all common The temperature required for the reaction process is high, heat transfer is difficult, the decomposition rate of ammonium chloride is low, and the crystal size of raw materials is high, so it is difficult to apply to industrial production.

Method used

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  • Method for decomposing chloride and releasing hydrogen chloride by using non-volatile acid or acidic salt
  • Method for decomposing chloride and releasing hydrogen chloride by using non-volatile acid or acidic salt
  • Method for decomposing chloride and releasing hydrogen chloride by using non-volatile acid or acidic salt

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 1050 g of 85% phosphoric acid into a reactor equipped with a stirrer, a thermometer, and a reflux condenser, heat to 150°C, grind 70 g of ammonium chloride solid, and slowly put it into the reactor, heat up to 200°C, and pass it in Nitrogen, the nitrogen flow rate is 40L / h, the condenser is connected to the pipe, the hydrogen chloride gas is absorbed with distilled water, and the temperature is controlled to react for 2 hours. After the reaction, the yield of hydrogen chloride was 95.2%.

[0023] After the reaction, the resulting mixture was heated to 230° C., and the ammonia gas was absorbed and released with an aqueous hydrogen chloride solution. The reaction was carried out for 1.5 hours, and the ammonia yield was 90%.

[0024] The solid salt obtained after the above discharging ammonia is used in a repeated cycle, the first step is repeated, and the reaction is 2 hours, and the yield of hydrogen chloride is 96.2%.

Embodiment 2

[0026] Add 560g of solid sodium bisulfate into a reactor equipped with a stirrer, a thermometer and a reflux condenser, heat to 200°C, grind 140g of ammonium chloride solid, and slowly put it into the reactor, heat up to 250°C, and pass in Nitrogen, the nitrogen flow rate is 70L / h, the condenser is connected to the pipe, the hydrogen chloride gas is absorbed with distilled water, and the temperature is controlled for 1.5 hours. After the reaction, the yield of hydrogen chloride was 99%.

[0027] After the reaction, the resulting mixture was heated to 320°C, and ammonia gas was absorbed and released with an aqueous hydrogen chloride solution. The reaction was carried out for 1.5 hours, and the ammonia yield was 90%.

[0028] The solid salt obtained after the above discharging ammonia is used in a repeated cycle, the first step is repeated, and the reaction is carried out for 1.5 hours, and the yield of hydrogen chloride is 98.6%.

Embodiment 3

[0030] Add 1200g of 98% sulfuric acid into a reactor equipped with a stirrer, a thermometer and a reflux condenser, heat it to 160°C, grind 214g of ammonium chloride solid, and slowly put it into the reactor, heat up to 220°C, and pass it in Nitrogen, the nitrogen flow rate is 100L / h, the condenser is connected to the pipe, the hydrogen chloride gas is absorbed with distilled water, and the temperature is controlled to react for 1.8 hours. After the reaction, the measured yield of hydrogen chloride was 97.6%.

[0031] After the reaction, the resulting mixture was heated to 330°C, and ammonia gas was absorbed and released with an aqueous hydrogen chloride solution. The reaction was carried out for 1.5 hours, and the ammonia yield was 90%.

[0032] The solid salt obtained after the above discharging ammonia is used in a repeated cycle, the first step is repeated, and the reaction is performed for 1.8 hours, and the yield of hydrogen chloride is 97.2%.

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Abstract

The invention discloses a method for decomposing ammonium chloride to release hydrogen chloride by using non-volatile acid or acid salt, which is characterized by (1) adding the non-volatile acid or acid salt with weight ratio of 4-15 into a reactor with a blender, a thermometer and a reflux condenser, then heating to 150-200DEG C, (2) adding the solid powered ammonium chloride with weight ratio of 1 in the reactor, reacting at temperature of 200-250DEG C for 1-2 hours to obtain hydrogen chloride by yield coefficient of 95%-96%, (3) pyrolyzing obtained ammonium salt from step 2 and residual mixture of non-volatile acid or acid salt to release the hydrogen and then sending to step (1) and (2) to be recycled. The method resolves the problem of ammonium chloride sublimation well with low reaction temperature, fast reaction speed and thorough decomposition of the ammonium chloride, raw material can be recycled, cost is low, and the method is easy to be industrialized.

Description

Technical field [0001] The invention relates to a method for decomposing ammonium chloride to release hydrogen chloride by using a non-volatile acid or acid salt, and belongs to the field of inorganic chemical industry. Background technique [0002] Hydrogen chloride is one of the raw materials for the production of PVC by the calcium carbide method, and its output and quality directly affect the output and production cost of PVC. At present, the main source of hydrogen chloride for manufacturers using calcium carbide method to produce PVC is the synthesis of chlorine and hydrogen produced by ion-exchange membrane caustic soda production equipment. Because the process is mature and stable, a lot of practical experience has been accumulated in the production process, which is conducive to the long-term stable operation of the production; but because the hydrogen chloride involved in the synthesis of vinyl chloride is synthesized from chlorine and hydrogen, the purity is low, gener...

Claims

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Application Information

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IPC IPC(8): C01B7/05
Inventor 蒋文伟罗芩杨琴李晶晶
Owner SICHUAN UNIV
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