Production technology of salicylic acid
A production process, the technology of salicylic acid, which is applied in the field of medicine and chemical industry, can solve the problems of high temperature in the operating area, taking a long time to cool down, and unsatisfactory cooling effect, so as to increase production capacity, improve economic and social benefits, and reduce temperature Effect
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Embodiment 1
[0018] Put 6000kg of sodium salicylate aqueous solution into the refining tank, open the drinking water valve, add water to make the mass fraction of sodium salicylate 36%, add sulfuric acid dropwise to make the pH of the solution 5.5; heat up to 60°C, add activated carbon 80kg, decolorized for 45 minutes, and set aside; add water to the sulfuric acid preparation tank, then add concentrated sulfuric acid dropwise, so that the concentration of dilute sulfuric acid is 18%;
[0019] The mass ratio of sodium salicylate solution: dilute sulfuric acid: centrifugal washing water is 2.5:1:2.
[0020] Turn on the sodium salicylate decolorization liquid material transfer pump, open the dilute sulfuric acid feed valve, turn on the centrifugal washing water transfer pump, enter the continuous neutralization reactor through the rotameter, and carry out the neutralization reaction under the condition of stirring and circulating water cooling. Sodium salicylate decolorizing liquid flow is co...
Embodiment 2
[0022] Put 6000kg of sodium salicylate aqueous solution into the refining tank, open the drinking water valve, add water to make the mass fraction of sodium salicylate 38%, add sulfuric acid dropwise to make the pH of the solution 5.7; heat up to 65°C, add activated carbon 90kg, decolorized for 40min to obtain sodium salicylate decolorized solution for subsequent use; add water in the sulfuric acid preparation tank, then add concentrated sulfuric acid dropwise, so that the concentration of dilute sulfuric acid is 20%;
[0023] Wherein, the mass ratio of sodium salicylate solution:dilute sulfuric acid:centrifugal washing water is 2.2:1.2:2.5.
[0024] Turn on the sodium salicylate decolorization liquid material transfer pump, open the dilute sulfuric acid feed valve, turn on the centrifugal washing water transfer pump, enter the continuous neutralization reactor through the rotameter, and carry out the neutralization reaction under the condition of stirring and circulating water...
Embodiment 3
[0026] Put 6000kg of sodium salicylate aqueous solution into the refining tank, open the drinking water valve, add water to make the mass fraction of sodium salicylate 40%, add sulfuric acid dropwise to make the pH of the solution 5.9; heat up to 70°C, add activated carbon 100kg, decolorize for 30 minutes, and set aside; add water to the sulfuric acid preparation tank, then add concentrated sulfuric acid dropwise, so that the concentration of dilute sulfuric acid is 22%;
[0027] Wherein, the mass ratio of sodium salicylate solution: dilute sulfuric acid: centrifugal washing water is 2.5:1.0:3.
[0028] Turn on the sodium salicylate decolorization liquid material transfer pump, open the dilute sulfuric acid feed valve, turn on the centrifugal washing water transfer pump, enter the continuous neutralization reactor through the rotameter, and carry out the neutralization reaction under the condition of stirring and circulating water cooling. Sodium salicylate decolorizing soluti...
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