Method for producing sodium carbonate from carbon dioxide in flue gas and recovering ammonia gas by using magnesium oxide

Abstract

The invention relates to a method for producing sodium carbonate from carbon dioxide in tail gas of a natural gas boiler and recovering ammonia gas by using magnesium oxide. The invention aims to provide a process method for preparing sodium carbonate by absorbing carbon dioxide in flue gas by using a combined alkali preparation method principle and recovering ammonia gas in ammonium chloride by using magnesium oxide. According to the method, ammonia gas is recycled when carbon dioxide is absorbed by utilizing the principle of a combined alkali preparation method, caustic soda is prepared by utilizing the product sodium bicarbonate and calcined calcium carbonate, and the method avoids the problem that ammonia gas in ammonium chloride cannot be recycled and uses a high-energy-consumption calcining furnace, so the cost input and the energy consumption are greatly reduced, meanwhile, CO2 in the flue gas is reduced, and the light sodium carbonate with high additional value is obtained.

Description

technical field [0001] The invention relates to a process for preparing soda ash from carbon dioxide in flue gas, in particular to a method for producing soda ash with carbon dioxide in natural gas tail gas and recovering ammonia with magnesium oxide. Background technique [0002] Carbon dioxide is the main component of greenhouse gases, and greenhouse gases are the main cause of global warming. Reducing carbon dioxide emissions is an important strategic measure for our country. At present, the application and development of carbon dioxide emission reduction technologies in the world are restricted by many practical factors, which cannot meet the needs of rapid economic development. Therefore, it is of great significance to study new technologies and methods for carbon dioxide emission reduction and recycling in industrial production, to construct such projects and to realize their environmental effects and economic benefits. [0003] Over the years, many scientific researc...

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Problems solved by technology

However, the analysis of the above patents has problems such as the high price of raw materials used for recovery, and the inability to recycle ammonia gas. Therefore, to solve these problems, under the condition of ensuring the high efficiency of absorbing carbon dioxide, avoid using caustic soda with a higher price as much as possible, and realize self-sufficiency. The production of caustic soda and the recycling of ammonia are of great significance for the recovery of carbon dioxide in the flue gas and the production of soda ash and other products

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