Preparation of caustic soda
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This post was last edited by swwsdwf on 2009-12-8 17:19 Dear sea friends: At present, we are using 48% liquid caustic soda. We want to change it to 98% caustic soda (solid caustic soda) to make liquid caustic soda. What is the highest concentration that can be prepared without affecting the pump and pipeline (to prevent crystallization from clogging)? Thanks!
It is still recommended that you use 48% liquid caustic soda. The preparation of liquid caustic soda requires cooling and stirring equipment. The solubility of 283K is 98g, the solubility of 293K is 109g, and the solubility of 303K is 119g.
The best way to prevent crystal blockage is to add an insulation layer, otherwise 48% of the crystals may be blocked, which is related to the quality of the caustic soda 1# dimeriser
Liquid caustic soda can be used directly, which is convenient. But the transportation cost is higher because half of it is water, and the storage tank needs to be large. ； After dissolving the caustic soda, a new dissolving device needs to be added, which can save transportation costs, but will also increase the cost of feeding materials, which must be weighed. As for the alkali preparation, it is very convenient to calculate and operate.
The concentration of 98 alkali that can be prepared is mainly based on the needs. If the concentration is high, there is a risk of pipe blockage, which can be solved by raising the temperature.
This post was last edited by TF123 on 2009-10-24 21:53 Sodium hydroxide dissolves easily in water, very quickly, and releases a certain amount of heat. As long as you calculate the ratio of water and caustic soda at a concentration of approximately 50%, and stir appropriately, there will be no blockage. It is necessary to add water first and then deduct the alkali. It is best to add it at the same time and make good use of the impact of the water to stir. Blockage of pipelines is usually caused by incompletely dissolved caustic soda. Of course, 50% alkali solution will crystallize to blockage when the temperature is lower than 10 degrees Celsius. Usually equipment pipelines must be insulated, especially in seasons with low temperatures or in the north. If it is clogged, flush it with water or steam. Pipelines have been clogged when we were producing 50% alkali and 72% alkali. 50% alkali will autolyse in winter when the temperature rises slightly. 72% alkali must be flushed with water or steam. I still remember the blockage in the production of 99% caustic soda. The 99% alkali solution will crystallize and block at 280 degrees. The blockage in the discharge buffer tank is flushed with water. The added process water is heated to boiling by the crystallized alkali, and regular soda water spurts out, accompanied by sounds. It is really spectacular!
Dear bosses: If liquid caustic soda is changed to caustic soda, what work needs to be done as a project? I have never done any project. Please feel free to enlighten me. Thank you! QQ: 824636496
Like concentrated sulfuric acid, caustic soda will release a lot of heat when it comes into contact with water. Generally, caustic soda is added to water, so pay attention to safety.
The higher the temperature, the concentration of alkali solution that can be configured should increase. The temperature should be controlled as needed.