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Method for preparing sodium carbonate and coproducing hydrochloric acid by sodium chloride catalytic thermal decomposition method

A technology of sodium chloride catalysis and thermal decomposition method is applied in the field of preparing sodium carbonate and co-producing hydrochloric acid, which can solve the problems of low preparation process efficiency, low utilization efficiency of sodium and chlorine atoms, and high energy consumption, and achieves simplified preparation process and technology, The effect of good additional economic benefits and good prospects for industrial application

Active Publication Date: 2020-11-17
TAIYUAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low efficiency, complex flow process, high energy consumption, high environmental pollution, and low utilization efficiency of sodium and chlorine atoms in the preparation process of sodium carbonate and hydrochloric acid in the prior art, the present invention provides a sodium chloride catalyzed thermal Method for preparing sodium carbonate co-production hydrochloric acid by decomposition method

Method used

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  • Method for preparing sodium carbonate and coproducing hydrochloric acid by sodium chloride catalytic thermal decomposition method

Examples

Experimental program
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Effect test

Embodiment 1

[0019] In this example, biomass activated carbon was used as the catalyst, 15 wt% NaCl was loaded onto the activated carbon by solution impregnation method, 500 g sample was placed in a tube furnace, the temperature was programmed to 550 °C, and CO 2 Catalytic activation with water vapor, stop heating after reacting for 30 min, measure the HCl content in the water after the gas phase product is quenched by water, and measure the HCl content in the water after the solid phase cooling 2 Hydrothermal pressure leaching to obtain Na 2 CO 3 solution, and then after heating, concentration and crystallization, Na 2 CO 3 products, the specific steps are as follows:

[0020] (1) NaCl was loaded onto the biomass activated carbon catalyst by solution impregnation method, and the NaCl loading was 15 wt%;

[0021] (2) Take a 500 g sample and place it in a tube furnace, raise the temperature to 550 °C at a heating rate of 10 °C / min, and mix water vapor and CO 2 Activated decomposition b...

Embodiment 2

[0026] In this example, Shenmu bituminous coal was used as a catalyst, and 10 wt% NaCl was loaded onto Shenmu bituminous coal by solution impregnation method, and 500 g of the sample was placed in a tube furnace, and the temperature was raised to 300 °C by program, and CO 2 Catalytic activation with water vapor, stop heating after reacting for 30 min, measure the HCl content in the water after the gas phase product is quenched by water, and measure the HCl content in the water after the solid phase cooling 2 Hydrothermal pressure leaching to obtain Na 2 CO 3 solution, and then after heating, concentration and crystallization, Na 2 CO 3 products, the specific steps are as follows:

[0027] (1) NaCl was loaded onto the Shenmu bituminous coal catalyst by solution impregnation method, and the NaCl loading was 10 wt%;

[0028] (2) Take a 500 g sample and place it in a tube furnace, raise the temperature to 500 °C at a heating rate of 10 °C / min, and mix water vapor and CO 2 The...

Embodiment 3

[0033] In this example, graphite is used as a catalyst, 10 wt% NaCl is loaded onto the graphite by solution impregnation method, 500 g of the sample is placed in a tube furnace, the temperature is programmed to 700 ° C, and CO 2 Catalytic activation with water vapor, stop heating after reacting for 30 min, measure the HCl content in the water after the gas phase product is quenched by water, and measure the HCl content in the water after the solid phase cooling 2 Hydrothermal pressure leaching to obtain Na 2 CO 3 solution, and then after heating, concentration and crystallization, Na 2 CO 3 product. Specific steps are as follows:

[0034] (1) NaCl was loaded onto the graphite catalyst by solution impregnation method, and the NaCl loading was 5 wt%;

[0035] (2) Take a 500 g sample and place it in a tube furnace, raise the temperature to 500 °C at a heating rate of 10 °C / min, and mix water vapor and CO 2 The NaCl-supported graphite was passed through for activated decompo...

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Abstract

The invention discloses a method for preparing sodium carbonate and coproducing hydrochloric acid by a sodium chloride catalytic thermal decomposition method, and relates to the field of sodium carbonate preparation methods and processes. According to the method, sodium chloride is loaded on a carbon catalyst carrier by adopting solution impregnation, then the CO2 and water vapor are introduced after the carbon catalyst carrier is heated to a certain temperature; the chlorine is preferentially released as HCl gas under the action of the water vapor by utilizing the catalytic decomposition effect of the sodium chloride on the carbon catalyst carrier, and hydrochloric acid is obtained after HCl is absorbed by water; meanwhile, the sodium on the activated carbon reacts with CO2 to be converted into sodium carbonate, and then the sodium carbonate is soaked into a solution after being washed with CO2 water and then filtered, heated and crystallized to obtain sodium carbonate, and co-production of sodium carbonate and hydrochloric acid is achieved. According to the method, sodium carbonate is prepared through catalytic thermal decomposition of NaCl by a one-step method, dilute hydrochloric acid is co-produced, and the method is a novel Na2CO3 preparation process and has a good industrial application prospect and great additional economic benefit. The method further byproduces combustible gas.

Description

technical field [0001] The invention relates to the field of sodium carbonate preparation method and technology, in particular to a method for preparing sodium carbonate and co-producing hydrochloric acid by using a sodium chloride catalytic thermal decomposition method. Background technique [0002] Sodium carbonate is an important chemical raw material, widely used in metallurgy, glass manufacturing, detergent preparation and other fields. Commonly used raw materials for the preparation of sodium carbonate are sodium chloride and carbon dioxide, and sodium chloride provides a cheap sodium source for the preparation of sodium carbonate. Soxhlet alkali-making method and Hou's alkali-making method are often used in the preparation of sodium carbonate. First, ammonia, water and carbon dioxide are used to react to form ammonium bicarbonate, and then sodium bicarbonate has a small solubility, which is preferentially precipitated in the sodium salt system, and then the carbonic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/02C01B7/03C10L3/00
CPCC01D7/02C01B7/035C10L3/00
Inventor 梅艳钢
Owner TAIYUAN INST OF TECH
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