Solid-liquid separation device for producing dimethyl carbonate
By using solid-liquid separation devices with components such as centrifugal separators in the production of dimethyl carbonate, the problems of frequent maintenance, high production costs and exhaust gas are solved, and the equipment is continuously operated, low production costs and no exhaust gas are achieved.
Patent Information
- Application Number
- CN202421953841.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-13
AI Technical Summary
In the production of traditional dimethyl carbonate, solid-liquid separation equipment needs to frequently replace the filter cloth, which has high maintenance frequency, increased production costs, and intermittent operation of the equipment, resulting in problems of exhaust gas.
A solid-liquid separation device is adopted, including a centrifugal separator, variable frequency bidirectional motor, visual mirror, rotating scraper, magnetic inductor coil, security filter and monitoring, so as to achieve continuous operation of the equipment without the need for filter cloth and purge process and no exhaust gas generation.
It achieves thorough solid-liquid separation, reduces production costs, reduces equipment maintenance frequency, avoids exhaust gas production, and is suitable for large-scale production.
Smart Images
Figure CN222969399U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of dimethyl carbonate production, in particular to a solid-liquid separation device for dimethyl carbonate production. Background Technique
[0002] In the traditional production of dimethyl carbonate with propylene carbonate / ethylene carbonate as raw materials and sodium methoxide as a catalyst, propylene carbonate / ethylene carbonate and methanol react under the catalysis of sodium methoxide to produce dimethyl carbonate and propylene glycol / ethylene glycol. During the refining process of propylene glycol / ethylene glycol, it is necessary to first react the sodium methoxide contained in the material with carbon dioxide and water to form sodium carbonate, and then filter and separate the solid-liquid mixture of sodium carbonate and propylene glycol / ethylene glycol through a plate and frame filter or a candle filter to obtain sodium carbonate filter residue and a crude propylene glycol / ethylene glycol solution. Both the plate and frame filter and the candle filter operate intermittently, use filter cloth for filtration, the operation process requires frequent manual switching, and a large number of equipment are set. And the filter cloth is easily damaged during use and needs to be changed frequently, with a high maintenance frequency, increasing the production cost. The filtered filter residue needs to be dried with nitrogen, resulting in a large consumption of nitrogen, a strong smell on site, and a lot of tail gas. Summary of the Invention
[0003] In view of the above-mentioned disadvantages, the utility model provides a solid-liquid separation device for dimethyl carbonate production, with thorough separation of solids and liquids, continuous operation of the equipment, no need for filter cloth and purging process, no tail gas generation, low production cost, few standby machines, low maintenance frequency, and facilitating large-scale production of the device.
[0004] A solid-liquid separation device for dimethyl carbonate production mentioned in the utility model, its technical solution is: a solid-liquid separation device for dimethyl carbonate production, comprising a centrifuge, a variable-frequency bidirectional motor, a sight glass, a rotary scraper, a magnetic induction coil, a security filter, and monitoring. The inlet of the centrifuge is connected to the feed pipeline, the filtrate outlet at the bottom of the centrifuge is connected to the inlet of the sight glass, the outlet of the sight glass is connected to the inlet of the centrifuge, the outlet of the sight glass is connected to the inlet of the security filter, the outlet of the security filter is connected to the filtrate refining unit, the filter residue outlet at the bottom of the centrifuge is connected to the filter residue treatment unit, a rotary scraper is arranged at the filter residue outlet of the centrifuge, the centrifuge uses a variable-frequency bidirectional motor, and a magnetic induction coil is arranged outside the centrifuge.
[0005] Preferably, a magnetic induction coil is arranged outside the centrifuge, and the magnetic induction intensity is 0.1~10T.
[0006] Preferably, a rotary scraper is arranged at the filter residue outlet of the centrifuge, and the rotation speed of the rotary scraper is 15r~200r / min.
[0007] Preferably, the above-mentioned centrifuge uses a variable-frequency bidirectional motor. After the variable-frequency bidirectional motor runs forward for 1 to 48 hours, it runs reversely procedurally for 0.5 to 10 minutes.
[0008] Preferably, a monitor is provided at the above-mentioned sight glass, and the monitoring image is connected to the operation room.
[0009] The advantages and beneficial effects of the present utility model are as follows: The solid-liquid mixture of sodium carbonate and propylene glycol / ethylene glycol is centrifuged by a centrifuge, and the separation effect is complete; the equipment runs continuously, with low inspection and maintenance frequency, reducing the manual operation intensity; the filtrate state is remotely observed through the sight glass and the monitor, realizing unattended operation on site; a scraper is provided at the filter residue outlet to facilitate the discharge of the filter residue and prevent caking and blockage; the centrifuge uses a variable-frequency bidirectional motor to control the centrifugal speed to adjust the centrifugal separation effect, and at the same time procedurally switches the motor rotation direction, and uses the separated filtrate to wash the inside of the equipment to prevent the filter residue from caking and blocking the equipment; the magnetic induction intensity of the magnetic induction coil of the centrifuge body is adjusted to promote the coalescence and increase of sodium carbonate salts in the material, facilitating centrifugal separation. Description of the Drawings
[0010] Figure 1 It is a schematic structural diagram of the present utility model. Reference numerals: 1 centrifuge, 2 variable-frequency bidirectional motor, 3 sight glass, 4 rotating scraper, 5 magnetic induction coil, 6 security filter, 7 monitor. Detailed Embodiments
[0011] The following describes the preferred embodiments of the present utility model with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model.
[0012] In a dimethyl carbonate production plant with an annual output of 50,000 tons, for the separation of the solid-liquid mixture of sodium carbonate and propylene glycol, the present utility model provides a solid-liquid separation device for dimethyl carbonate production to replace the original plate-and-frame filter system, which includes a centrifuge 1, a variable-frequency bidirectional motor 2, a sight glass 3, a rotating scraper 4, a magnetic induction coil 5, a security filter 6, and a monitor 7. The inlet of the centrifuge 1 is connected to the feed pipeline, the filtrate outlet at the bottom of the centrifuge 1 is connected to the inlet of the sight glass 3, the outlet of the sight glass 3 is connected to the inlet of the centrifuge 1, the outlet of the sight glass 3 is connected to the inlet of the security filter 6, the outlet of the security filter 6 is connected to the filtrate refining unit, the filter residue outlet at the bottom of the centrifuge 1 is connected to the filter residue treatment unit, a rotating scraper 4 is provided at the filter residue outlet of the centrifuge 1, the centrifuge 1 uses a variable-frequency bidirectional motor 2, and a magnetic induction coil 5 is provided outside the centrifuge 1.
[0013] When the utility model is in use, the solid-liquid mixture of sodium carbonate and propylene glycol / ethylene glycol obtained in production is transported to a centrifuge, and centrifugal separation is carried out by adjusting the rotational speed with a variable-frequency bidirectional motor. Adjust the magnetic induction coil intensity to 2T. At the beginning of operation, the filtrate after centrifugal separation returns to the inlet pipeline of the centrifuge. Observe the sight glass at the filtrate outlet pipeline and the remote monitoring at the sight glass to remotely observe the clarification state of the filtrate. When the filtrate in the sight glass is clarified, switch the filtrate to a security filter. The filtrate obtained after being filtered again by the security filter enters the propylene glycol / ethylene glycol refining unit for treatment. Start the rotary scraper at the filter residue outlet of the centrifuge, adjust the scraper rotational speed to 60 r / min, and discharge the filter residue outward to the filter residue treatment unit; continuously feed the centrifuge through the sight glass, and continuously discharge the filtrate and the filter residue. Adjust the forward and reverse running time of the variable-frequency bidirectional motor. When the variable-frequency bidirectional motor runs forward for 18 h, run in reverse for 2 min, and the rotation direction of the variable-frequency bidirectional motor is switched procedurally to flush the residual filter residue in the equipment.
[0014] When conducting the technical solution of this embodiment and testing the dimethyl carbonate production device with an annual output of 50,000 tons, the operation test results are as follows in the table, which shows that: the filtrate and filter residue obtained after separation meet the production requirements, and the maintenance frequency is significantly reduced, achieving the expected effect.
[0015] The above embodiment is only one implementation form of the solid-liquid separation device provided by the utility model for dimethyl carbonate production. Other deformations according to the solution provided by the utility model, adding or reducing components therein, or applying the utility model to other technical fields close to the utility model all belong to the protection scope of the utility model.
Claims
1. A solid-liquid separation device for the production of dimethyl carbonate, comprising a centrifugal separator (1), a variable frequency bidirectional motor (2), a sight glass (3), a rotating scraper (4), a magnetic induction coil (5), a safety filter (6), and a monitor (7), wherein: The inlet of the centrifuge (1) is connected to a feed pipeline, the filtrate outlet at the bottom of the centrifuge (1) is connected to the inlet of a sight glass (3), the outlet of the sight glass (3) is connected to the inlet of the centrifuge (1), the outlet of the sight glass (3) is connected to the inlet of a security filter (6), the outlet of the security filter (6) is connected to a filtrate refining unit, the filter residue outlet at the bottom of the centrifuge (1) is connected to a filter residue processing unit, a rotating scraper (4) is provided at the filter residue outlet of the centrifuge (1), the centrifuge (1) adopts a variable frequency bidirectional motor (2), and a magnetic induction coil (5) is provided outside the centrifuge (1).
2. A solid-liquid separation device for the production of dimethyl carbonate according to claim 1, characterized in that: A magnetic induction coil (5) is arranged outside the centrifuge (1), and the magnetic induction intensity is 0.1-10T.
3. A solid-liquid separation device for dimethyl carbonate production according to claim 1, characterized in that: The centrifugal separator (1) is provided with a rotating scraper (4) at the residue outlet, and the rotating speed of the rotating scraper is 15 r / min to 200 r / min.
4. A solid-liquid separation device for dimethyl carbonate production according to claim 1, characterized in that: The centrifugal separator (1) uses a variable frequency bidirectional motor (2). After the variable frequency bidirectional motor runs in the forward direction for 1 to 48 hours, it is programmed to run in the reverse direction for 0.5 to 10 minutes.
5. A solid-liquid separation device for dimethyl carbonate production according to claim 1, characterized in that: The viewing mirror (3) is provided with a monitor (7), and the monitor image is connected to the operating room.