Method of making caustic soda from soda ash
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This post was last edited by mkp369 on 2016-10-6 07:27 Soda ash, sodium carbonate, chemical formula Na2CO3, also known as soda, is a white powder, and the aqueous solution is alkaline； Caustic soda, sodium hydroxide, chemical formula NaOH, also known as caustic soda and fire soda, is generally in the form of flakes and granules, and its aqueous solution is alkaline. http://www.qkgs.net/ueditor/php/upload/image/20160923/1474591697250322.jpghttp://www.qkgs.net/ueditor/php/upload/image/20160923/1474591715840028.jpg The common method of making caustic soda from soda ash is that soda ash and calcium hydroxide generate calcium carbonate and sodium hydroxide aqueous solution under the action of medium water. The chemical reaction equation of making caustic soda from soda ash is:: Na2CO3+Ca(OH)2==CaCO3+2NaOH This method of producing sodium hydroxide does not cause pollution to the environment and has low production costs. It is the current mainstream method of producing caustic soda from soda ash. Calcium carbonate is also more convenient to prepare. Limestone decomposes into calcium oxide and carbon dioxide under high temperature conditions. The reaction equation is:: CaCO3 ——CaO+CO2↑(reaction conditions: high temperature), and then calcium oxide reacts with water to form calcium hydroxide. The chemical reaction equation is: CaO+H2O=Ca(OH)2. Because limestone is relatively common and relatively cheap, and sodium carbonate is also a relatively cheap chemical raw material, using this method to produce sodium hydroxide with high economic value is undoubtedly the most popular.
This post was last edited by qugd on 2016-9-26 09:56 This method is extremely inefficient and cannot produce a high concentration of alkali solution. Moreover, separation in the reaction system is difficult and there are many impurities. It has long been eliminated by industry. In addition, sodium carbonate is used as raw material. Do you know the production cost and process of sodium carbonate? The current ion membrane method electrolyzes brine to produce caustic soda, and can also produce raw materials (hydrogen and chlorine) for making hydrochloric acid. It can also provide reliable quality raw materials for a variety of chemical processes. This is the embodiment of environmental protection and efficiency.
Who said soda ash is a cheap chemical raw material?
It seems that the host is inexperienced.
This method is not economical, and laboratory production is just about the same.
This has little to do with experience, as I probably haven’t learned much about inorganic chemistry.