A 1,5 naphthalene diisocyanate production apparatus

Abstract

The utility model belongs to chemical equipment technical field discloses a 1, 5 naphthalene diisocyanate production device, including the mixing kettle, cold reactor, heat reactor, continuous filter device, thin film evaporator and retort that pass through pipeline, valve and pump are communicated in proper order, the mixing kettle is communicated to the dissolving kettle and BTC dissolving system respectively, the dissolving kettle is communicated to the dehydration kettle, the retort is respectively communicated to the front fraction receiving groove and main fraction receiving groove, and the main fraction receiving groove is communicated to the catcher and tablet making machine through pipeline and valve respectively. The utility model production efficiency is high, and the product quality is stable, and the labour intensity of staff is low, can carry out large -scale production, satisfies the market demand.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a 1,5-naphthalene diisocyanate production device. Background Technology

[0002] 1,5-Naphthalene diisocyanate is a high-performance specialty isocyanate. Polyurethane products made from it exhibit high hardness, good resilience, good heat resistance, excellent dynamic properties, and good wear resistance. It can be used in environments where ordinary polyurethane cannot meet requirements or will prematurely fail, such as high-temperature and oily environments. Therefore, it is often used as a raw material for synthesizing advanced polyurethanes. Additionally, it is frequently used in pesticides and pharmaceutical intermediates. Due to the high melting point, excellent elasticity, good dynamic properties, and long service life of 1,5-naphthalene diisocyanate products, its application prospects are very broad. Currently, the production of 1,5-naphthalene diisocyanate mostly adopts a batch synthesis route. However, this production line suffers from drawbacks such as small production scale, low production efficiency, unstable product quality, high labor intensity for employees, and unsuitability for large-scale production, making it difficult to meet market demand. Therefore, to meet the ever-growing market demand, these problems need to be addressed. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a 1,5-naphthalene diisocyanate production device that overcomes the defects of the existing technology, has high production efficiency, stable product quality, low labor intensity of employees, and can carry out large-scale production to meet market needs.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A 1,5-naphthalene diisocyanate production apparatus includes a mixing vessel, a cold reactor, a hot reactor, a continuous filter, a thin-film evaporator, and a distillation vessel (the outlet of the former is connected to the inlet of the latter) connected sequentially by pipes, valves, and pumps. The inlet of the mixing vessel is connected to the outlet of a dissolving vessel and a BTC (solid phosgene, (trichloromethyl) carbonate) dissolving system, and the inlet of the dissolving vessel is connected to the outlet of a dehydration vessel. The outlet of the distillation vessel is connected to the inlet of a pre-fraction receiving tank and the inlet of a main fraction receiving tank, and the outlet of the main fraction receiving tank is connected to the inlet of a trap and the inlet of a tablet making machine via pipes and valves. The valves, pumps, dehydration vessel, dissolving vessel, BTC dissolving system, mixing vessel, cold reactor, hot reactor, continuous filter, thin-film evaporator, distillation vessel, pre-fraction receiving tank, main fraction receiving tank, trap, and tablet making machine are all electrically connected to a DCS distributed control system.

[0006] Preferably, the dehydration vessel is a continuous dehydration vessel equipped with a pressure reduction system.

[0007] Preferably, the dissolving vessel is a dissolving vessel equipped with a circulation device.

[0008] Preferably, the BTC dissolving system is a pipe-type dissolving unit equipped with a low-temperature circulation system, and two are connected in parallel (for alternating use).

[0009] Preferably, the mixing vessel is a mixing vessel equipped with an online mixing device.

[0010] Preferably, the cold reactor is a multi-stage series reactor.

[0011] Furthermore, the cold reactor is a three-stage series reactor.

[0012] Preferably, the thermal reactor is a tubular reactor equipped with a gradient temperature control device.

[0013] Preferably, the continuous filtration device is an automatic backwash filter equipped with an online filtration device.

[0014] Preferably, the thin-film evaporator is a continuous distillation and concentration thin-film evaporator.

[0015] Preferably, the distillation vessel is a distillation vessel equipped with a vacuum system.

[0016] Preferably, the fore fraction receiving tank is a fore fraction receiving tank equipped with a cooling coil; the main fraction receiving tank is a main fraction receiving tank equipped with a hot water insulation system.

[0017] Preferably, the trap is a horizontal trap equipped with a steam tracing device.

[0018] Preferably, the film-making machine is a rotary film-making machine equipped with a nitrogen protection device.

[0019] Preferably, the film-making machine is connected to a screening machine to screen and package the product.

[0020] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0021] This invention achieves continuous production of 1,5-naphthalene diisocyanate by using an automatically controlled continuous production device, overcoming the shortcomings of existing intermittent production methods, such as low production efficiency, unstable product quality, high labor intensity for employees, unsuitability for large-scale production, and difficulty in meeting market demand.

[0022] In summary, this utility model is reasonably designed, overcomes the defects of the prior art, has high production efficiency, stable product quality, low labor intensity for employees, and can be mass-produced to meet market needs. Attached Figure Description

[0023] Figure 1This is a structural flowchart of an embodiment of the present utility model;

[0024] In the diagram, 1. Dehydration vessel; 2. Dissolving vessel; 3. BTC dissolving system; 4. Mixing vessel; 5. Cold reactor; 6. Hot reactor; 7. Continuous filtration device; 8. Thin-film evaporator; 9. Distillation vessel; 10. Fore-fraction receiving tank; 11. Main fraction receiving tank; 12. Collector; 13. Film making machine. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1:

[0027] like Figure 1 As shown, a 1,5-naphthalene diisocyanate production apparatus includes a mixing vessel 4, a cold reactor 5, a hot reactor 6, a continuous filter 7, a thin-film evaporator 8, and a distillation vessel 9, which are sequentially connected via pipes (not shown), valves (not shown), and pumps (not shown). The inlet of the mixing vessel 4 is connected to the outlets of the dissolving vessel 2 and the BTC dissolving system 3, respectively. The inlet of the dissolving vessel 2 is connected to the outlet of the dehydration vessel 1. The distillation vessel 9 is connected to a pre-fraction receiving tank 10 and a main fraction receiving tank 11, respectively. The main fraction receiving tank 11 is connected to a trap 12 and a tablet making machine 13 via pipes and valves. The valves, pumps, dehydration vessel 1, dissolving vessel 2, BTC dissolving system 3, mixing vessel 4, cold reactor 5, hot reactor 6, continuous filter 7, thin-film evaporator 8, distillation vessel 9, pre-fraction receiving tank 10, main fraction receiving tank 11, trap 12, and tablet making machine 13 are all electrically connected to a DCS distributed control system (not shown).

[0028] In actual production, amine raw materials are first quantitatively added to dehydration reactor 1 under nitrogen protection for heating and stirring, depressurization to remove water, and then heated to a liquefied state. After liquefaction, the material is transferred using nitrogen pressurization. It is first transferred to dissolving reactor 2 and solvent is added for dissolution. At the same time, BTC, activated carbon and other materials are added to BTC dissolution system 3 for mixing and dissolution. Then, the materials in dissolving reactor 2 and BTC dissolution system 3 are fed into mixing reactor 4 for thorough mixing. The materials are then fed into cold reactor 5 (three-stage reactors in series) for reaction at a temperature below 40°C. After the reaction is completed, the material is transferred to hot reactor 6 and kept at 90°C for 2 hours. Then, the temperature is raised to 130°C and the reaction is completed in 0.5-1 hours.

[0029] After the reaction, the material is filtered by the continuous filter device 7 and then the solvent in the material is separated by distillation in the thin film evaporator 8. Then the remaining material is sent to the distillation kettle 9 and distilled at 80-120℃ (vacuum degree -0.09MPa). The obtained fraction is mainly the fore fraction and a small amount of solvent, which is collected in the fore fraction receiving tank 10 for later use. After the fore fraction is distilled, the temperature is raised to 180-220℃ (vacuum degree -0.095MPa) to distill and obtain the main fraction, which is collected in the main fraction receiving tank 11. Then the gas phase is sent to the trap 12 (maintained at 80-100℃ to prevent crystallization blockage) for collection (the function of the trap 12 is to cool down some of the material vapor that has not cooled down during the distillation of the main fraction, and prevent the material vapor from entering the subsequent vacuum system, which would block the vacuum and waste material). After distillation, the material in the main fraction receiving tank 11 and the trap 12 is heated and then sent to the tableting machine 13 to make tablets to obtain the finished product 1,5-naphthalene diisocyanate.

[0030] 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 production apparatus for 1,5-naphthalene diisocyanate, characterized in that: It includes a mixing vessel, a cold reactor, a hot reactor, a continuous filtration device, a thin-film evaporator, and a distillation vessel, which are connected in sequence by pipes, valves, and pumps; the mixing vessel is connected to a dissolving vessel and a BTC dissolving system, and the dissolving vessel is connected to a dehydration vessel; the distillation vessel is connected to a pre-fraction receiving tank and a main fraction receiving tank, and the main fraction receiving tank is connected to a trap and a tablet making machine by pipes and valves.

2. The 1,5-naphthalene diisocyanate production apparatus as described in claim 1, characterized in that: The dehydration vessel is a continuous dehydration vessel equipped with a pressure reduction system; the dissolving vessel is a dissolving vessel equipped with a circulation device; the BTC dissolving system is a pipeline dissolving vessel equipped with a low-temperature circulation system, and two are connected in parallel; the mixing vessel is a mixing vessel equipped with an online mixing device.

3. The 1,5-naphthalene diisocyanate production apparatus as described in claim 1, characterized in that: The cold reactor is a multi-stage series reactor; the hot reactor is a tubular reactor equipped with a gradient temperature control device.

4. The 1,5-naphthalene diisocyanate production apparatus as described in claim 1, characterized in that: The continuous filtration device is an automatic backwash filter equipped with an online filtration device; the thin-film evaporator is a continuous distillation and concentration thin-film evaporator; and the distillation kettle is a distillation kettle equipped with a vacuum system.

5. The 1,5-naphthalene diisocyanate production apparatus as described in claim 1, characterized in that: The fore fraction receiving tank is equipped with a cooling coil; the main fraction receiving tank is equipped with a hot water insulation system.

6. The 1,5-naphthalene diisocyanate production apparatus as described in claim 1, characterized in that: The trap is a horizontal trap equipped with a steam tracing device; the film-making machine is a rotary film-making machine equipped with a nitrogen protection device.

7. The 1,5-naphthalene diisocyanate production apparatus as described in claim 1, characterized in that: A screening machine is connected to the film-making machine.

Images