Continuous drying apparatus for pharmaceutical grade dimethyl sulfone

Abstract

The utility model provides a continuous drying device for pharmaceutical grade dimethyl sulfone, including drying jar, drying jar one end is equipped with the feed jar body, drying jar other end is equipped with the discharge jar body, be equipped with total vacuum pump on the drying jar, be equipped with multistage drying zone in the drying jar, the feed jar body includes material jar, buffer jar and discharge jar, be equipped with first vacuum pump on the material jar, be equipped with second vacuum pump on the buffer jar. The feed jar body structure makes the material keep sealed state all the time in the process of entering the drying jar from the feed jar body, and the material keeps negative pressure state at the same time, and the same discharge jar makes the material keep sealed and negative pressure state all the time after drying from the drying jar into the discharge jar, and the material whole overshoot is in sealed and negative pressure state, and the internal pressure of drying equipment is lower than the outside atmospheric pressure, so as to avoid that the material is polluted by air dust and microorganism etc.

Description

Technical Field

[0001] This utility model relates to the field of dimethyl sulfone production, and in particular to a continuous drying apparatus for pharmaceutical-grade dimethyl sulfone. Background Technology

[0002] The quality control of dimethyl sulfone for pharmaceutical-grade new products is extremely stringent, especially regarding moisture content, crystal breakage, and external contamination, making production control very difficult.

[0003] Existing drying equipment includes rake dryers, double cone dryers, and drum dryers. All three require intermittent feeding and discharging. Rake dryers can handle approximately 80% particle size of dimethyl sulfone; double cone dryers handle approximately 40% particle size, require open feeding and discharging, necessitate multiple manual maintenance personnel, and suffer from low drying efficiency and dust pollution upon discharge; drum dryers handle approximately 30% particle size, have poor sealing, result in higher moisture content, poor drying effect, and continuous dust pollution. Inconsistent temperature control in existing drying equipment leads to significant moisture fluctuations, low drying efficiency, high moisture content, severe particle size loss, poor sealing, and material contamination. Utility Model Content

[0004] This invention provides a continuous drying device for pharmaceutical-grade dimethyl sulfone, which solves the problems of large moisture fluctuations, low drying efficiency, high moisture content, severe material particle size loss, poor sealing, and material contamination caused by the differential temperature control of existing drying equipment.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a continuous drying device for pharmaceutical grade dimethyl sulfone, including a drying tank, a feeding tank at one end of the drying tank, a discharging tank at the other end of the drying tank, a main vacuum pump on the drying tank, and a multi-stage drying belt inside the drying tank. The feeding tank includes a material tank, a buffer tank and a discharge tank. A first vacuum pump is provided on the material tank and a second vacuum pump is provided on the buffer tank.

[0006] In the preferred embodiment, the drying tank is provided with a feed inlet and a discharge outlet, the feed inlet being connected to the feeding tank and the discharge outlet being connected to the discharge tank body.

[0007] In the preferred embodiment, a first conveyor is provided between the material tank and the buffer tank, and a second conveyor is provided between the buffer tank and the discharge tank.

[0008] In a preferred embodiment, the discharge tank includes a storage tank, a lower buffer tank, and a discharge tank connected in sequence. A third vacuum pump is installed on the storage tank, and a fourth vacuum pump is installed on the lower buffer tank.

[0009] In the preferred embodiment, a fourth conveyor is provided between the storage tank and the lower buffer tank, and a fifth conveyor is provided between the lower buffer tank and the discharge tank.

[0010] In the preferred embodiment, a conveyor is provided between the discharge tank and the drying tank.

[0011] In the preferred embodiment, the multi-stage drying belt includes multiple vertically staggered conveying and drying mechanisms, which, from top to bottom, include a low-temperature vacuum dehydration zone, a medium-temperature zone, a high-temperature drying zone, and a reheating zone.

[0012] In a preferred embodiment, the conveying and drying mechanism includes two rollers connected by a belt, and a serpentine pipe is provided between the upper and lower belts.

[0013] In the preferred embodiment, the two ends of the serpentine pipe are connected to a water tank, and a water pump is installed between the water tank and the serpentine pipe.

[0014] The beneficial effects of this utility model are as follows: When the device needs to operate for drying, the fourth conveyor of the feeding tank is opened to connect the feeding tank and the drying tank. The drying tank is evacuated by the main vacuum pump to bring both the feeding tank and the drying tank to a negative pressure state. Then, the fourth conveyor is closed, and the first conveyor of the material tank is opened to allow the material to enter the buffer tank. After the material enters the buffer tank, the first conveyor closes to place the material in the buffer tank. The second vacuum pump is then driven to bring the buffer tank and the feeding tank to the same negative pressure state. The second conveyor is then opened to allow the material to enter the feeding tank. Finally, the third conveyor is opened to allow the material to enter the multi-stage drying belt in the drying tank. The feeding tank structure ensures that the material remains sealed and under negative pressure throughout its journey from the feeding tank into the drying tank. Similarly, the discharge tank ensures that the material remains sealed and under negative pressure throughout its journey from the drying tank into the discharge tank. The material is kept in a sealed and negative pressure state throughout the entire process, and the internal pressure of the drying equipment is lower than the external atmospheric pressure. This prevents the material from being contaminated by airborne dust and microorganisms, avoiding dust spillage or impurity intrusion, thus preventing safety risks and on-site pollution.

[0015] The drying tank and multi-stage drying belt are placed horizontally. The multi-stage drying belt includes multiple vertically staggered conveyor drying mechanisms, ensuring that all materials pass through each layer. This maximizes space utilization, increases the drying area, maximizes surface evaporation, and achieves high drying efficiency. Simultaneously, the multi-stage drying belt, combined with the feeding tank structure, enables intermittent production, reducing energy consumption and labor costs. The belt conveyor system prevents material particles from colliding, effectively improving material integrity and reducing breakage rates. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a side view of the feed tank body of this utility model; Figure 3 This is a side view of the discharge tank of this utility model; Figure 4 This is a side view of a partial structure of the multi-stage drying belt of this utility model; Figure 5 This is a top view of the conveying and drying mechanism of this utility model; In the diagram: Drying tank 1; Inlet 101; Outlet 102; Feed tank 2; Material tank 201; First conveyor 2011; First vacuum pump 2012; Buffer tank 202; Second conveyor 2021; Second vacuum pump 2022; Feed tank 203; Third conveyor 2031; Discharge tank 3; Storage tank 301; Fourth conveyor 3011; Lower buffer tank 302; Fifth conveyor 3021; ​​Discharge tank 303; Multi-stage drying belt 4; Conveyor 5; Conveying and drying mechanism 6; First motor 601; Drum 602; Belt 603; Serpentine pipe 604; Main vacuum pump 7. Detailed Implementation

[0017] Example 1: like Figure 1-5The continuous drying device for pharmaceutical grade dimethyl sulfone includes a drying tank 1, a feed tank 2 at one end of the drying tank 1, a discharge tank 3 at the other end of the drying tank 1, a main vacuum pump 7 on the drying tank 1, and a multi-stage drying belt 4 inside the drying tank 1. The feed tank 2 includes a material tank 201, a buffer tank 202 and a discharge tank 203. A first vacuum pump 2012 is installed on the material tank 201, and a second vacuum pump 2022 is installed on the buffer tank 202. With this structure, when the device needs to operate during drying, the fourth conveyor 3011 of the feeding tank 203 is opened to connect the feeding tank 203 with the drying tank 1. The drying tank 1 is evacuated by the main vacuum pump 7 to bring the feeding tank 203 and the drying tank 1 into a negative pressure state. Then the fourth conveyor 3011 is closed, the first conveyor 2011 of the material tank 201 is opened to allow the material to enter the buffer tank 202. After that, the first conveyor 2011 is closed to keep the material in the buffer tank 202. The second vacuum pump 2022 is driven to bring the buffer tank 202 and the feeding tank 203 into the same negative pressure state. The second conveyor 2021 is opened to allow the material to enter the feeding tank 203. Then the third conveyor 2031 is opened to allow the material to enter the multi-stage drying belt 4 in the drying tank 1. The structure of the feeding tank 2 ensures that the material remains sealed as it enters the drying tank 1, while also maintaining a negative pressure. Similarly, the discharge tank 3 ensures that the material remains sealed and under negative pressure as it enters the discharge tank 303 after drying. The material is kept sealed and under negative pressure throughout the entire process, and the internal pressure of the drying equipment is lower than the external atmospheric pressure. This prevents the material from being contaminated by airborne dust and microorganisms, thus avoiding dust spillage or impurity intrusion and mitigating safety risks and on-site pollution.

[0018] The drying tank 1 is placed horizontally, and the multi-stage drying belt 4 is also placed horizontally. The multi-stage drying belt 4 includes multiple vertically staggered conveying and drying mechanisms 6, ensuring that all materials pass through each layer of conveying and drying mechanisms 6. This maximizes space utilization, increases the drying area, maximizes material surface evaporation, and achieves high drying efficiency. Simultaneously, the multi-stage drying belt 4, in conjunction with the feeding tank 2 structure, enables intermittent production, reducing energy consumption and labor costs. The conveying method of the belt 603 avoids collisions between material particles, effectively improving material integrity and reducing the breakage rate.

[0019] In a preferred embodiment, the drying tank 1 is provided with a feed inlet 101 and a discharge outlet 102. The feed inlet 101 is connected to the discharge tank 203, and the discharge outlet 102 is connected to the discharge tank body 3.

[0020] In a preferred embodiment, a first conveyor 2011 is provided between the material tank 201 and the buffer tank 202, and a second conveyor 2021 is provided between the buffer tank 202 and the discharge tank 203. With this structure, when the device needs to operate during drying, the fourth conveyor 3011 of the discharge tank 203 is opened to connect the discharge tank 203 to the drying tank 1. The main vacuum pump 7 is used to evacuate the drying tank 1, bringing both the discharge tank 203 and the drying tank 1 to a negative pressure state. Then, the fourth conveyor 3011 is closed, and the first conveyor 2011 of the material tank 201 is opened to allow the material to enter the buffer tank 202. Afterward, the first conveyor 2011 closes to ensure the material is located in the buffer tank 202. The second vacuum pump 2022 is then driven to bring the buffer tank 202 and the discharge tank 203 to the same negative pressure state. The second conveyor 2021 is then opened to allow the material to enter the discharge tank 203. Finally, the third conveyor 2031 is opened to allow the material to enter the multi-stage drying belt 4 in the drying tank 1. The structure of the feed tank 2 ensures that the material remains sealed during the process of entering the drying tank 1 from the feed tank 2, while the material is kept under negative pressure.

[0021] In a preferred embodiment, the discharge tank 3 includes a storage tank 301, a lower buffer tank 302, and a discharge tank 303 connected in sequence. A third vacuum pump is installed on the storage tank 301, and a fourth vacuum pump is installed on the lower buffer tank 302. Therefore, the structure of the discharge tank 3 is the same as that of the feed tank 2.

[0022] When material needs to be discharged, open the conveyor 5 to allow the material to enter the discharge tank 303, then close the conveyor 5 and drive the fourth vacuum pump on the lower buffer tank 302 to bring the lower buffer tank 302 to the same vacuum state as the drying tank 1. Then open the fifth conveyor 3021 to allow the material to enter the lower buffer tank 302. Close the fifth conveyor 3021 and drive the third vacuum pump to bring the storage tank 301 to the same negative pressure state as the lower buffer tank 302. Finally, open the fourth conveyor 3011 to allow the material to enter the storage tank 301.

[0023] In a preferred embodiment, a fourth conveyor 3011 is provided between the storage tank 301 and the lower buffer tank 302, and a fifth conveyor 3021 is provided between the lower buffer tank 302 and the discharge tank 303.

[0024] In a preferred embodiment, a conveyor 5 is provided between the discharge tank 303 and the drying tank 1. With this configuration, the material from the drying tank 1 is driven into the discharge tank 303 by driving the conveyor 5.

[0025] In a preferred embodiment, the multi-stage drying belt 4 includes multiple vertically staggered conveying and drying mechanisms 6. These mechanisms 6, from top to bottom, sequentially include a low-temperature vacuum dehydration zone, a medium-temperature zone, a high-temperature drying zone, and a reheating zone. Therefore, there are nine conveying and drying mechanisms 6, which, from top to bottom, sequentially include a low-temperature vacuum dehydration zone, a medium-temperature zone, a high-temperature drying zone, and a reheating zone.

[0026] When the material first enters the drying system, it is in a low-temperature vacuum dehydration zone with high water content and a fragile crystal structure. The low temperature and vacuum environment can remove most of the water with minimal thermal shock while lowering the boiling point of water, preventing crystal melting, agglomeration or surface cracking.

[0027] The medium-temperature zone avoids the problems of low efficiency at low temperatures or qualitative changes caused by direct impact from high temperatures.

[0028] The high-temperature drying zone reduces the moisture content of the material to the final requirement, while also completing some of the morphological stabilization functions.

[0029] The reheating zone cools the materials after high-temperature drying to near room temperature, preventing moisture absorption, clumping, or deterioration during subsequent packaging due to excessive temperature differences.

[0030] In a preferred embodiment, the conveying and drying mechanism 6 includes two rollers 602 connected by a belt 603, with a serpentine pipe 604 connecting the upper and lower belts 603. This structure, combined with the multi-stage drying belt 4 and the feed tank 2, enables intermittent production, reducing energy consumption and labor costs. The conveying method of the belt 603 avoids collisions between material particles, effectively improving material integrity and reducing breakage rates.

[0031] In the preferred embodiment, both ends of the serpentine pipe 604 are connected to a water tank, and a water pump is installed between the water tank and the serpentine pipe 604. With this structure, each layer of the conveying and drying mechanism 6 is equipped with a separate water tank, increasing drying efficiency, and the serpentine structure of the serpentine pipe 604 further enhances the drying effect.

[0032] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A continuous drying apparatus for pharmaceutical-grade dimethyl sulfone, characterized in that: It includes a drying tank (1), a feeding tank (2) at one end of the drying tank (1), a discharging tank (3) at the other end of the drying tank (1), a main vacuum pump (7) on the drying tank (1), and a multi-stage drying belt (4) inside the drying tank (1). The feeding tank (2) includes a material tank (201), a buffer tank (202) and a discharge tank (203). The material tank (201) is equipped with a first vacuum pump (2012), and the buffer tank (202) is equipped with a second vacuum pump (2022).

2. The continuous drying apparatus for pharmaceutical-grade dimethyl sulfone according to claim 1, characterized in that: The drying tank (1) is provided with a feed inlet (101) and a discharge outlet (102). The feed inlet (101) is connected to the feeding tank (203), and the discharge outlet (102) is connected to the discharge tank body (3).

3. The continuous drying apparatus for pharmaceutical-grade dimethyl sulfone according to claim 1, characterized in that: A first conveyor (2011) is provided between the material tank (201) and the buffer tank (202), and a second conveyor (2021) is provided between the buffer tank (202) and the discharge tank (203).

4. The continuous drying apparatus for pharmaceutical-grade dimethyl sulfone according to claim 1, characterized in that: The discharge tank (3) includes a storage tank (301), a lower buffer tank (302) and a discharge tank (303) connected in sequence. The storage tank (301) is equipped with a third vacuum pump and the lower buffer tank (302) is equipped with a fourth vacuum pump.

5. The continuous drying apparatus for pharmaceutical-grade dimethyl sulfone according to claim 4, characterized in that: material storage... A fourth conveyor (3011) is provided between the tank (301) and the lower buffer tank (302), and a fifth conveyor (3021) is provided between the lower buffer tank (302) and the discharge tank (303).

6. The continuous drying apparatus for pharmaceutical-grade dimethyl sulfone according to claim 4, characterized in that: A conveyor (5) is provided between the discharge tank (303) and the drying tank (1).

7. The continuous drying apparatus for pharmaceutical-grade dimethyl sulfone according to claim 1, characterized in that: The multi-stage drying belt (4) includes multiple vertically staggered conveying and drying mechanisms (6), which, from top to bottom, include a low-temperature vacuum dehydration zone, a medium-temperature zone, a high-temperature drying zone, and a reheating zone.

8. The continuous drying apparatus for pharmaceutical-grade dimethyl sulfone according to claim 1, characterized in that: The conveying and drying mechanism (6) includes two rollers (602), which are connected by a belt (603), and a serpentine pipe (604) is provided between the upper and lower belts (603).

9. The continuous drying apparatus for pharmaceutical-grade dimethyl sulfone according to claim 8, characterized in that: The two ends of the serpentine pipe (604) are connected to the water tank, and a water pump is installed between the water tank and the serpentine pipe (604).

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