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Novel process for preparing sodium carbonate and byproduct gypsum by using sodium sulfate and carbon dioxide as raw materials

A technology for carbon dioxide and by-product gypsum, applied in carbonate preparations, calcium/strontium/barium sulfate, inorganic chemistry, etc., can solve the problems of low production efficiency and long production process, achieve low operating costs, and reduce wastewater treatment. Energy consumption, mild reaction conditions

Pending Publication Date: 2022-05-10
GUIZHOU EAST CHINA ENG
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Problems solved by technology

[0004] The present invention intends to provide a new process for producing soda ash by-product gypsum with sodium sulfate and carbon dioxide as raw materials, so as to solve the technical problems of low production efficiency and long production process in the current soda ash preparation process

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  • Novel process for preparing sodium carbonate and byproduct gypsum by using sodium sulfate and carbon dioxide as raw materials
  • Novel process for preparing sodium carbonate and byproduct gypsum by using sodium sulfate and carbon dioxide as raw materials
  • Novel process for preparing sodium carbonate and byproduct gypsum by using sodium sulfate and carbon dioxide as raw materials

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Embodiment 1

[0034] The differences in substrate materials, treatment conditions and product yields in Examples 1-3 and Comparative Examples 1-3 are shown in Table 1. Taking Example 1 as an example, a new process for preparing soda ash by-product gypsum with sodium sulfate and carbon dioxide as raw materials is described.

[0035] The technical scheme of the present invention combines the metathesis reaction of sodium sulfate and ammonium bicarbonate and the wet decomposition process of sodium bicarbonate to prepare soda ash, and the ammonia gas (gas I) and carbon dioxide (gas II) produced by the process are synthesized into hydrogen carbonate through the ammonia distillation process and carbonization process Ammonium, the synthesized ammonium bicarbonate can be reacted with sodium sulfate again to prepare soda ash. Reaction raw materials according to figure 1 The process shown in the reaction, while preparing soda ash and by-product gypsum, recycles the gas generated in the process, and ...

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Abstract

The invention relates to the technical field of sodium carbonate preparation, and discloses a novel process for preparing sodium carbonate and byproduct gypsum by taking sodium sulfate and carbon dioxide as raw materials, the process combines a double decomposition reaction of sodium sulfate and ammonium bicarbonate and a wet decomposition process of sodium bicarbonate to prepare sodium carbonate, and the other product ammonium sulfate of the double decomposition reaction reacts with lime powder to obtain gypsum; ammonia gas and carbon dioxide generated by the process are synthesized into ammonium bicarbonate for cyclic utilization through ammonia gas absorption and carbonization processes. According to the scheme, a large amount of chemical by-product anhydrous sodium sulphate (sodium sulfate) is used as a raw material, sodium carbonate with large capacity and demand in the glass market is produced through double decomposition reaction and wet decomposition reaction, and the problem of chloride ion treatment and secondary pollution caused by chloride ion treatment are completely eradicated from the source; and the method has the advantages of mild reaction conditions, low investment, low operation cost and high profitability, and can be widely applied to production of sodium carbonate.

Description

technical field [0001] The invention relates to the technical field of sodium carbonate preparation, in particular to a new process for preparing soda ash by-product gypsum by using sodium sulfate and carbon dioxide as raw materials. Background technique [0002] The chemical name of soda ash is sodium carbonate (Na 2 CO 3 ), is one of the important chemical raw materials, which are widely used in light industry, daily chemical industry, building materials, chemical industry, food industry, metallurgy, textile, petroleum, national defense, medicine and other fields. The glass manufacturing industry is the main consumer sector of soda ash. Production 1 ton of glass consumes about 0.2 tons of soda ash; therefore, the production process and efficiency of soda ash are particularly important. [0003] The prior art mainly adopts the ammonia-soda method and combined soda method to produce soda ash, wherein the ammonia-soda method is one of the main methods for industrial product...

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Application Information

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IPC IPC(8): C01D7/12C01F11/46
CPCC01D7/126C01F11/46C01P2006/80
Inventor 邹彦明王勃巩志海石庭芳张德仁
Owner GUIZHOU EAST CHINA ENG
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