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Sealed boiling dryer for p-nitrobenzoic acid
Sealed boiling dryer for p-nitrobenzoic acid
Jun 19, 2024
Case introduction: Para-nitrobenzoic acid closed boiling dryer is a new type of dryer with inert gas to protect recyclable solvent. When the wet material of para-nitrobenzoic acid enters the main engine of the dryer through negative pressure or floor blanking, the inert gas is injected into the drying system. After the system contains a certain amount of oxygen, the hot air and wet material of p-nitrobenzoic acid are fully mixed to carry out mass and heat transfer.
P-nitrobenzoic acid is a yellow-white crystal, commonly used as pharmaceutical intermediates, such as procaine, procaine amide, folic acid and other drugs synthesis, but also widely used in dyes, fuels and synthetic pesticides. Potassium p-nitrobenzoate is toxic and irritating to the skin, and should be sealed and dry and kept away from light. Production equipment should be sealed to prevent leakage. Operators should wear protective equipment to avoid contact with skin and eyes of potassium p-nitrobenzoate.
P-nitrobenzoic acid is a yellow-white crystal, commonly used as pharmaceutical intermediates, such as procaine, procaine amide, folic acid and other drugs synthesis, but also widely used in dyes, fuels and synthetic pesticides. Potassium p-nitrobenzoate is toxic and irritating to the skin, and should be sealed and dry and kept away from light. Production equipment should be sealed to prevent leakage. Operators should wear protective equipment to avoid contact with skin and eyes of potassium p-nitrobenzoate.
Production process of p-nitrobenzoic acid:
It is obtained by the oxidation of p-nitrotoluene. The oxidizing agent can be sodium dichromate, air, manganese ore powder, nitric acid, etc. P-nitrobenzoic acid was synthesized from p-nitrotoluene by oxidation with sodium dichromate in the presence of sulfuric acid at 55℃. The reaction liquid is filtered, dehydrated and dried to obtain the finished product. In addition, 1-p-nitrophenyl-2-amino-1, 3-propanediol, the right-hand compound in the production of chloramphenicol, is easily oxidized with nitric acid to obtain p-nitrobenzoic acid.
According to the physical characteristics of p-nitrobenzoic acid, Longxin selected closed boiling as the prototype machine, and made a special dryer for p-nitrobenzoic acid through continuous research and development and improvement.
It is obtained by the oxidation of p-nitrotoluene. The oxidizing agent can be sodium dichromate, air, manganese ore powder, nitric acid, etc. P-nitrobenzoic acid was synthesized from p-nitrotoluene by oxidation with sodium dichromate in the presence of sulfuric acid at 55℃. The reaction liquid is filtered, dehydrated and dried to obtain the finished product. In addition, 1-p-nitrophenyl-2-amino-1, 3-propanediol, the right-hand compound in the production of chloramphenicol, is easily oxidized with nitric acid to obtain p-nitrobenzoic acid.
According to the physical characteristics of p-nitrobenzoic acid, Longxin selected closed boiling as the prototype machine, and made a special dryer for p-nitrobenzoic acid through continuous research and development and improvement.
Closed boiling dryer is a new type of dryer with inert gas to protect recyclable solvent. When wet material of p-nitrobenzoic acid enters the main engine of the dryer through negative pressure or floor blanking, inert gas is passed into the drying system. When the oxygen content of the system reaches a certain content, the hot air after heat exchange of the heat exchanger will be sucked into the dryer through the fan under negative pressure .Mass and heat transfer were carried out after mixing with p-nitrobenzoic acid wet material. The p-nitrobenzoic acid is continuously dried, and the steamed moisture is continuously sucked out by the induced draft fan.
The extracted gas and part of the fine powder will enter the gas-solid separator, and the separated p-nitrobenzoic acid fine powder will settle and recover, and the gas will be taken away by the fan. The moisture will be dehumidified by the surface cooler, and then into the cooling recycler, until a certain amount is reached, and then out of the system, collected and stored. The gas dehumidified by the surface cooler will return to the heater inlet for the next drying cycle.
Para-nitrobenzoic acid closed boiling dryer equipment features:
1. the operation of the equipment is completely closed, the internal is filled with inert gas protection, effectively isolated the external air intrusion, the whole equipment explosion-proof, deodorant, anti-solvent gas leakage.
2. the solvent gas is closed recovery, not only to protect the environment, no pollution waste gas discharge, in line with national GMP standards, recovery of solvent means high economic benefits and cost reduction.
3. The air dehumidified by the condenser is a dry gas with low moisture content. When the inert gas is nitrogen, the effect of nitrogen displacing the solvent greatly improves the drying efficiency.
4. The micro-negative pressure operation of the drying host can avoid the occurrence of powder jet in the host when the equipment is micro-leaking.
5. set up a burst port and oxygen sensor, effectively avoid the equipment beyond the operating conditions after the occurrence of safety accidents.
Structure characteristics of sealed boiling dryer for p-nitrobenzoic acid
1. the host adopts circular vertical structure, there is no dead Angle in the host. Automatic feed and feed structure is adopted, and there is a stirring mechanism in the skip, which can break the phenomenon of ditch flow and assist fluidization. The inner bag dust collector is arranged in the upper cylinder body, and the ash is cleaned by pulse chamber. The skip car and the main engine are sealed by silicone, with good sealing performance and no leakage. The main machine is equipped with a blasting port, which automatically explodes when there is a security hazard in the system.
2. the gas-solid separator adopts high pressure pulse online dust removal method, the cloth bag adopts the suction type skeleton structure, easy to disassemble, the cloth bag adopts peritoneal cloth bag dust removal effect is good, there is no dust in the tail gas, can ensure the dust collection rate of more than 99.5%, and effectively protect the table cooler and heater.
3. the surface cooler (liquid collection tank needs to be equipped with another) adopts efficient plate fin structure, which can effectively recover the solvent in the tail gas, and the solvent recovery rate is more than 90%.
4. the fan adopts the company's special sealing form, which can ensure that the external leakage rate of the system is zero.
5. the heater uses bent fin winding fin tube, high thermal efficiency, small volume.
Longxin continues to absorb advanced technology at home and abroad and with more than ten years of down-to-earth drying experience, the airtight boiling dryer improved and developed has been popular sales since its debut, has been widely used in all walks of life, and has become a star product of our company .Our company has the industry's advanced experimental center, equipped with a variety of prototypes, warmly look forward to new and old users to visit the factory for testing, to discuss cooperation!
The extracted gas and part of the fine powder will enter the gas-solid separator, and the separated p-nitrobenzoic acid fine powder will settle and recover, and the gas will be taken away by the fan. The moisture will be dehumidified by the surface cooler, and then into the cooling recycler, until a certain amount is reached, and then out of the system, collected and stored. The gas dehumidified by the surface cooler will return to the heater inlet for the next drying cycle.
Para-nitrobenzoic acid closed boiling dryer equipment features:
1. the operation of the equipment is completely closed, the internal is filled with inert gas protection, effectively isolated the external air intrusion, the whole equipment explosion-proof, deodorant, anti-solvent gas leakage.
2. the solvent gas is closed recovery, not only to protect the environment, no pollution waste gas discharge, in line with national GMP standards, recovery of solvent means high economic benefits and cost reduction.
3. The air dehumidified by the condenser is a dry gas with low moisture content. When the inert gas is nitrogen, the effect of nitrogen displacing the solvent greatly improves the drying efficiency.
4. The micro-negative pressure operation of the drying host can avoid the occurrence of powder jet in the host when the equipment is micro-leaking.
5. set up a burst port and oxygen sensor, effectively avoid the equipment beyond the operating conditions after the occurrence of safety accidents.
Structure characteristics of sealed boiling dryer for p-nitrobenzoic acid
1. the host adopts circular vertical structure, there is no dead Angle in the host. Automatic feed and feed structure is adopted, and there is a stirring mechanism in the skip, which can break the phenomenon of ditch flow and assist fluidization. The inner bag dust collector is arranged in the upper cylinder body, and the ash is cleaned by pulse chamber. The skip car and the main engine are sealed by silicone, with good sealing performance and no leakage. The main machine is equipped with a blasting port, which automatically explodes when there is a security hazard in the system.
2. the gas-solid separator adopts high pressure pulse online dust removal method, the cloth bag adopts the suction type skeleton structure, easy to disassemble, the cloth bag adopts peritoneal cloth bag dust removal effect is good, there is no dust in the tail gas, can ensure the dust collection rate of more than 99.5%, and effectively protect the table cooler and heater.
3. the surface cooler (liquid collection tank needs to be equipped with another) adopts efficient plate fin structure, which can effectively recover the solvent in the tail gas, and the solvent recovery rate is more than 90%.
4. the fan adopts the company's special sealing form, which can ensure that the external leakage rate of the system is zero.
5. the heater uses bent fin winding fin tube, high thermal efficiency, small volume.
Longxin continues to absorb advanced technology at home and abroad and with more than ten years of down-to-earth drying experience, the airtight boiling dryer improved and developed has been popular sales since its debut, has been widely used in all walks of life, and has become a star product of our company .Our company has the industry's advanced experimental center, equipped with a variety of prototypes, warmly look forward to new and old users to visit the factory for testing, to discuss cooperation!
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