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Method for producing ammonium bisulfate and hydrogen chloride by using ammonium chloride and sulfuric acid

A technology of ammonium bisulfate and ammonium chloride, which is applied in the field of chemical technology and can solve problems such as affecting the reaction, excessive free acid, and affecting product quality

Inactive Publication Date: 2008-03-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that: (1) the water in the raw material sulfuric acid, and the mother liquor after ammonium sulfate crystallization are put back into the reactor for recycling, and there will be more and more water, because the product hydrogen chloride is dissolved in water and cannot be volatilized, which will seriously affect the reaction (2) If the molar ratio of ammonium chloride to sulfuric acid is less than 1, there will be too much free acid in the product, thereby affecting product quality

Method used

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  • Method for producing ammonium bisulfate and hydrogen chloride by using ammonium chloride and sulfuric acid
  • Method for producing ammonium bisulfate and hydrogen chloride by using ammonium chloride and sulfuric acid
  • Method for producing ammonium bisulfate and hydrogen chloride by using ammonium chloride and sulfuric acid

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preparation example Construction

[0060] 5. Preparation of hydrochloric acid and anhydrous hydrogen chloride

[0061] The absorption of hydrogen chloride is completed in the packed tower, and the absorbent can be dilute acid (about 21% HCl) from the bottom of the desorption tower. The solubility of hydrogen chloride in water decreases with the increase of temperature. When the absorption temperature is 50°C (adiabatic absorption), 31% hydrochloric acid can be obtained, while when the absorption temperature is 30°C, 36% hydrochloric acid can be obtained. The packing absorption tower can choose steel lining tiles or phenolic impregnated graphite or rubber.

[0062] The purpose of desorption is to desorb HCl into a gaseous state by heating concentrated hydrochloric acid. HCl can be freed from concentrated hydrochloric acid at elevated temperatures, which is the desorption process.

[0063] In industry, the hydrochloric acid desorption tower and the dilute acid reboiler are actually a connected device. Concentr...

Embodiment 1

[0069] Embodiment 1: the preparation of ammonium bisulfate and hydrochloric acid

[0070] Weigh 100 grams of solid ammonium chloride into glass flask reactor 1, and gradually add industrial sulfuric acid (96wt%) of theoretically calculated amount under constant stirring. The reactor is connected to the absorption bottle 2 through a pipeline, and the hydrogen chloride gas generated is absorbed by the primary absorption bottle 2 and the secondary absorption bottle 3 and then emptied through the water circulation pump. The whole system maintains a slight negative pressure state. The temperature inside the glass flask reactor 1 is 120±3°C, and the reaction time is 30 minutes. After the reaction is completed, powdery ammonium bisulfate product is obtained. X-ray diffraction analysis, as shown in Figure 3, analysis result shows that product is ammonium bisulfate. The purity of ammonium bisulfate is 98wt%.

[0071] The first-level absorption bottle 2 is (31wt%) hydrochloric acid ...

Embodiment 2

[0072] Embodiment 2: the preparation of ammonium sulfate and hydrochloric acid

[0073] Add 1 kg of solid ammonium chloride and 1.91 kg of industrial sulfuric acid in a spiral stirring reactor in a parallel manner. The average residence time of materials in the reaction tank is 30min, and the reaction temperature is 120±10°C. Reactants and products are constantly entering and exiting. The discharged ammonium bisulfate product is ammoniated and granulated to make granular ammonium sulfate of about 1mm in size, with a purity of 99%.

[0074] The hydrogen chloride gas produced is sent to the water absorption tower through pipelines, and hydrochloric acid is generated through adiabatic absorption. The absorption tower is a packed tower, or it can be a type of absorption tower such as a valve tower. Hydrogen chloride gas enters the absorption tower from the lower part of the tower and forms a countercurrent flow with the water poured in from the upper part of the tower, passes t...

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Abstract

The present invention relates to solid-liquid reaction process of solid ammonium chloride and sulfuric acid to obtain high grade ammonium bisulfate and hydrogen chloride gas, and the process has molar ratio between ammonium chloride and sulfuric acid of 1 to 0.9-1.1, concentration of sulfuric acid of 93-98 wt%, reaction temperature of 60-130 deg.c and reaction time of 5-60 min. The process may have ammonium chloride as the by product of sodium carbonate producing process and industrial sulfuric acid as the material. The produced hydrogen chloride gas may be absorbed with water to produce hydrochloric acid or further desorbed and refined to obtain anhydrous hydrogen chloride, and the produced ammonium bisulfate may be aminated to obtain ammonium sulfate. The process is simple, has easy control and no waste discharge, and provides one new way for best utilization of nitrogen element and chlorine element in ammonium chloride.

Description

technical field [0001] The invention relates to a process and equipment for producing ammonium bisulfate (or ammonium sulfate) and anhydrous hydrogen chloride (or hydrochloric acid) by reacting ammonium chloride, a by-product of soda ash industry, with industrial sulfuric acid, and belongs to the field of chemical technology. technical background [0002] Ammonium chloride is a by-product of the production of soda ash by the combined soda making method. For every ton of soda ash produced, one ton of ammonium chloride is produced. In recent years, due to the expansion of soda ash production, the production of ammonium chloride has also increased year by year. At present, the consumption of ammonium chloride in my country is mainly to add compound fertilizer in the form of ammonium nitrogen, which is suitable for crops such as rice, wheat, cotton, hemp, vegetables, etc. Crops (such as tobacco, orange, tangerine, sugar cane, etc.) are not suitable for use, because the chlorine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24C01B7/01
Inventor 梁斌游贤贵张昭吴限博李海成黄学超赖雪飞
Owner SICHUAN UNIV
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