A catalyst recovery apparatus in 1,5-diaminonaphthalene production

Abstract

The utility model relates to the technical field of chemical equipment relates to a kind of catalyst recovery device in 1,5-diaminonaphthalene production, including the deamination kettle, drying device, elution tank, concentration kettle by pipeline, pump and valve are sequentially communicated;Concentration kettle is equipped with gas outlet and liquid outlet, and the gas outlet of concentration kettle is sequentially communicated to first condenser, second condenser and receiving tank by pipeline, pump and valve;The liquid outlet of concentration kettle is sequentially communicated to crystallization tank, centrifugal device by pipeline, pump and valve, and the liquid outlet of centrifugal device is communicated to centrifugal mother liquor tank by pipeline and valve, and centrifugal mother liquor tank is communicated to concentration kettle by pipeline, pump and valve.The utility model production process is simple, and the catalyst in production can be recycled, to ensure environmental safety and reduce cost and increase efficiency.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a catalyst recovery device in the production of 1,5-diaminonaphthalene. Background Technology

[0002] 1,5-Diaminonaphthalene (NDA), also known as 1,5-naphthyldiamine, is an important aromatic amine compound. As an organic synthesis intermediate, it has wide applications in pigments, dyes, pharmaceuticals, rubber additives, resins, and photosensitive materials. In particular, 1,5-diaminonaphthalene can be used to synthesize 1,5-naphthalene diisocyanate (NDI), which can be further used to synthesize high-performance polyurethanes, thus creating a significant market demand.

[0003] Currently, the main production methods for 1,5-diaminonaphthalene involve the hydrogenation reduction of 1,5-dinitronaphthalene and the ammonolysis of 1,5-naphthyldiphenol. Hydrogenation reduction is highly hazardous, and incompletely reacted raw materials significantly impact the quality of subsequent products. Ammonolysis, on the other hand, involves a milder reaction. 1,5-Naphthyldiphenol reacts with ammonia under a catalyst and high pressure to produce 1,5-diaminonaphthalene, which is then further processed to obtain the finished product. The catalyst used is sodium bisulfite, which is consumed in relatively large quantities. If not recycled, its discharge with waste materials not only causes environmental pollution but also wastes raw materials and increases the economic burden. Therefore, it is necessary to design appropriate equipment for catalyst recovery and treatment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a catalyst recovery device in the production of 1,5-diaminonaphthalene, which has a simple production process and can recover and reuse the catalyst in production, ensuring environmental safety and reducing costs and increasing efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A catalyst recovery device for the production of 1,5-diaminonaphthalene includes a deammoniation vessel, a drying device, an elution tank, and a concentration vessel connected in sequence by pipes, pumps, and valves. The concentration vessel has a gas outlet and a liquid outlet. The gas outlet of the concentration vessel is connected in sequence by pipes, pumps, and valves to a first condenser, a second condenser, and a receiving tank. The liquid outlet of the concentration vessel is connected in sequence by pipes, pumps, and valves to a crystallization tank and a centrifuge device. The liquid outlet of the centrifuge device is connected in sequence by pipes and valves to a centrifuge mother liquor tank, and the centrifuge mother liquor tank is connected to the concentration vessel by pipes, pumps, and valves.

[0007] Preferably, the ammonia removal vessel is equipped with a temperature exchange device, a stirring device, and a nitrogen protection device; it is also equipped with a feed inlet, a gas outlet, and a liquid outlet. The feed inlet is connected to a filter press installed after the crystallization vessel in the previous process through pipes and valves. The gas outlet is connected to an ammonia treatment device through pipes, pumps, and valves. The liquid outlet is connected to a drying device.

[0008] Preferably, the drying device is an SZG double cone rotary vacuum dryer. The manufacturer is Changzhou Zhongya Chemical Environmental Protection Equipment Co., Ltd.

[0009] Preferably, the eluent tank is equipped with a filter screen with a mesh size of 1000 (for separating organic coarse materials and the catalyst sodium bisulfite; when rinsing with steam, sodium bisulfite has a high solubility in hot water, forming an aqueous solution, while the organic matter cannot dissolve in the steam water, thus achieving separation); a temperature exchange jacket is provided on the side wall of the tank, and a nitrogen inlet (for nitrogen protection and drying) and a steam inlet (for eluenting) are provided at the top of the tank.

[0010] Preferably, the concentration kettle is equipped with a temperature exchange device and a stirring device. The model is GBL-3m. 2 The manufacturer is Yixing Changhua Filter Material Co., Ltd.

[0011] Preferably, the first condenser is a cooling water condenser, model 3JK38-10M. 2 The second condenser is a chilled brine condenser, model 3JK38-5M. 2 The manufacturers are all Nantong Graphite Equipment Factory in China.

[0012] Preferably, the receiving tank is provided with a liquid outlet and a gas outlet. The liquid outlet is connected to the water washing device or ammonia treatment device of the previous process through pipes, pumps and valves, and the gas outlet is connected to the tail gas treatment device through pipes.

[0013] Preferably, the crystallization tank is a stainless steel crystallization vessel (custom-made). The model is 2KL, and the manufacturer is Jiaxing Dikent Chemical Machinery Co., Ltd.

[0014] Preferably, the centrifuge is a PGZ1000-N type centrifuge. The manufacturer is Jiangsu Mudan Centrifuge Manufacturing Co., Ltd.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] This invention dries, washes, concentrates, and crystallizes the liquid produced in the ammonia removal kettle during the process. The solid material obtained by centrifugation is sodium bisulfite catalyst. The mother liquor obtained by centrifugation is returned to the concentration kettle for further processing. The waste gas produced in the concentration kettle is condensed twice to obtain a liquid containing trace amounts of ammonia, which is collected in a receiving tank for further processing.

[0017] In summary, the production process of this utility model is simple, and the catalyst used in production can be recycled and reused, ensuring environmental safety and reducing costs while increasing efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0019] The components include: 1. Ammonia removal vessel; 2. Drying device; 3. Eluting tank; 4. Concentrating vessel; 5. First condenser; 6. Second condenser; 7. Receiving tank; 8. Crystallization tank; 9. Centrifugation device; and 10. Centrifugal mother liquor tank. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1:

[0022] like Figure 1 As shown, a catalyst recovery device in the production of 1,5-diaminonaphthalene includes a deammoniation vessel 1, a drying device 2, an elution tank 3, and a concentration vessel 4, which are connected in sequence via pipes (not shown), pumps (not shown), and valves (not shown). The concentration vessel 4 is provided with a gas outlet (not shown) and a liquid outlet (not shown). The gas outlet of the concentration vessel 4 is connected in sequence via pipes, pumps, and valves to a first condenser 5, a second condenser 6, and a receiving tank 7. The liquid outlet of the concentration vessel 4 is connected in sequence via pipes, pumps, and valves to a crystallization tank 8 and a centrifuge device 9. The liquid outlet of the centrifuge device 9 is connected in sequence via pipes and valves to a centrifugal mother liquor tank 10. The centrifugal mother liquor tank 10 is connected in sequence via pipes, pumps, and valves to the concentration vessel 4.

[0023] In actual production, the mother liquor obtained after filtration of the crystallization product from the previous production process mainly consists of ammonia and catalyst, with a small amount of target product and impurities (residual materials and 1,5-dihydroxynaphthalene oxide). This mother liquor is then transported to ammonia removal reactor 1 for deammoniation treatment. The volatilized ammonia and water vapor from the gas outlet of reactor 1 enter an ammonia treatment device for further processing. The resulting residual liquid is then dried in drying unit 2. The dried material is then transported to washing tank 3, where steam is introduced for washing (the steam volume is 2-3 times the material weight) to remove organic materials and impurities. The obtained washing liquid is transported to the concentration tank 4 for concentration. The gas generated during concentration is processed sequentially through the first condenser 5 and the second condenser 6 to obtain a liquid containing trace amounts of ammonia, which is temporarily stored in the receiving tank 7 and then used for water washing in the production process or transported to the ammonia water tank in the ammonia treatment device for ammonia recovery. The concentrated liquid generated by concentration enters the crystallization tank 8 for crystallization. The crystallized products are then sent to the centrifuge device 9 for solid-liquid separation. The obtained solid is the recovered catalyst sodium bisulfite, and the liquid enters the centrifuge mother liquor tank 10, and is then pumped back to the concentration tank 4 for further processing.

[0024] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A catalyst recovery device for the production of 1,5-diaminonaphthalene, characterized in that: The system includes a deammoniation reactor, a drying device, a washing tank, and a concentration reactor, which are connected in sequence via pipes, pumps, and valves. The concentration reactor has a gas outlet and a liquid outlet. The gas outlet of the concentration reactor is connected in sequence via pipes, pumps, and valves to a first condenser, a second condenser, and a receiving tank. The liquid outlet of the concentration reactor is connected in sequence via pipes, pumps, and valves to a crystallization tank and a centrifuge device. The liquid outlet of the centrifuge device is connected in sequence via pipes and valves to a centrifuge mother liquor tank, and the centrifuge mother liquor tank is connected in sequence via pipes, pumps, and valves to the concentration reactor.

2. The catalyst recovery device in the production of 1,5-diaminonaphthalene according to claim 1, characterized in that: The deammonia removal reactor is equipped with a temperature exchange device, a stirring device, and a nitrogen protection device.

3. The catalyst recovery device in the production of 1,5-diaminonaphthalene according to claim 1, characterized in that: The drying device is an SZG double cone rotary vacuum dryer.

4. The catalyst recovery device in the production of 1,5-diaminonaphthalene according to claim 1, characterized in that: The eluent tank is equipped with a filter screen inside and a temperature exchange jacket on the side wall of the tank.

5. The catalyst recovery device in the production of 1,5-diaminonaphthalene according to claim 1, characterized in that: The concentration kettle is equipped with a temperature exchange device and a stirring device.

6. The catalyst recovery device in the production of 1,5-diaminonaphthalene according to claim 1, characterized in that: The first condenser is a cooling water condenser, and the second condenser is a chilled brine condenser.

7. The catalyst recovery device in the production of 1,5-diaminonaphthalene according to claim 1, characterized in that: The centrifuge device is a PGZ1000-N type centrifuge.

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