How to turn soda ash into liquid alkali? ? ?
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At present, the prices of liquid alkali and soda ash on the market are about the same. In terms of concentration, it is more cost-effective to use soda ash. Many places in our company are now changing the use of liquid alkali to soda ash. But when the soda ash is converted into liquid caustic soda, the soda ash is first put into the alkali tank, and then washed down with water to melt, or circulated with a pump. However, after the soda ash is converted, the concentration of the liquid caustic soda cannot be increased. It can only reach about 24%, which is not the 31% concentration we want. Why is this? Also, in the process of alkalizing liquid alkali, can the soda ash be completely melted by pump circulation? Is there a problem that it cannot be melted? Please help discuss this. Thanks!
What the poster means is to dissolve solid alkali into liquid alkali. Soda ash is sodium carbonate, and liquid alkali is sodium hydroxide solution. It should be able to reach the 31% concentration you mentioned. On the market, dried liquid alkali is definitely cheaper than solid alkali. Industrially, liquid alkali is concentrated and sliced. I went to Zigong Honghe Chlor-Alkali Factory a few days ago. I'm not sure exactly why your concentration can't go up. Maybe it's better to use a mixing tank instead of a circulating pump.
The poster should be talking about using solid sodium carbonate (soda ash) as a solution to replace the original 31% liquid alkali (sodium hydroxide 30 alkali). However, the solubility of soda ash is maximum at 35.4°C. 49.7g of sodium carbonate can be dissolved per 100g of water, and the sodium carbonate concentration is 33. 2%, converted to the corresponding sodium hydroxide concentration is about 25%, so it is not a problem of incomplete dissolution, but a problem of solubility.
The 4th floor is right. The solubility of soda ash is not very high. The edible alkali 10 water sodium carbonate we eat is solid, and it is less than 28% when converted into caustic soda.
Thanks for the guidance from my friend on the 4th floor. What you mean is that my maximum sodium hydroxide concentration can only reach about 25%. Is there any other way to increase its content, such as adding something? Please give me some advice: handshake
Heating is to speed up its solubility, but the maximum concentration of sodium hydroxide after Na2CO3 sodium carbonate is dissolved is only about 25%. I want to increase it to 31%. Is there any way to increase it? Can an expert give advice?
Stirring and heating can improve the temperature. This post was last edited by limingshuguang on 2008-12-9 10:25 ]
As my friend above said, can the concentration be raised to 31% by just stirring and heating? No need to add other materials or anything? :o
Soda ash and liquid soda ash are not the same thing at all. When the solubility is saturated, of course it cannot continue to dissolve naturally. Even if the temperature has returned to normal temperature by the time you use it, it will still crystallize.