Pretreatment device for production raw materials of diethyl oxalate

Abstract

The utility model relates to a diethyl oxalate production raw material pretreatment device, which comprises a raw material feeding bin and a stirring structure, and is characterized in that the raw material feeding bin consists of a conical hopper and a linear blanking pipe, electric heating pipes are uniformly wound on the outer side walls of the linear blanking pipe and the conical hopper, a protective cover for wrapping the electric heating pipes is arranged on the periphery of the raw material feeding bin, and the stirring structure is arranged on the protective cover. The upper end of the conical hopper is provided with an upper flange plate, the upper edge of the protective cover is fixedly connected with the upper flange plate, the lower edge of the protective cover is provided with a lower flange plate used for being connected with the top face of the reactor, and the lower flange plate is fixedly connected with the radial supporting plate. The stirring structure comprises a stirring motor, an upper stirring shaft, a lower stirring shaft, an upper stirring blade and a lower stirring blade, a flow control valve is arranged at the lower end of the linear discharging pipe, and a vibrator is fixed to the outer side of the lower end of the linear discharging pipe. The device solves the drying problem of the raw material rich hydroxylated graphene oxide, on one hand, the drying efficiency is guaranteed, and on the other hand, precise and rapid feeding is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a raw material pretreatment device for producing diethyl oxalate. Background Art

[0002] Diethyl oxalate, scientific name diethyl oxalate, is an ester. It is mainly used in the pharmaceutical industry and is an intermediate for drugs such as phenobarbital, azathioprine, sulfadoxine, sulfamethoxazole, carboxyphenyl penicillin, ampicillin, chloroquine lactate, and thiabendazole. It is also a plastic accelerator and dye intermediate. It is also used as a solvent for cellulose esters and spices. It is used as an acetylene extractant and a raw material for dyes, medicines, spices, etc.

[0003] Generally, when producing diethyl oxalate, ethanol, benzene and oxalic acid are added to a reactor and heated to 68°C, and azeotropic reflux dehydration is performed until anhydrous oxalate is taken out as the reaction end point, and then benzene is recovered to obtain crude diethyl oxalate, and vacuum distillation is performed to collect the 103°C / 6kPa fraction, which is diethyl oxalate. However, this method has a long production cycle and high unit consumption, which directly affects the production efficiency. At present, modified graphene can also be used to catalyze the synthesis of diethyl oxalate. Specifically, oxalic acid, ethanol, dehydrating agent benzene, and hydroxylated graphene oxide are added to the reactor in proportion, the reaction temperature is controlled until the dehydration is completed, benzene is removed by distillation at 140°C, and diethyl oxalate is obtained by cooling and filtering. The raw material-hydroxylated graphene oxide needs to be obtained in advance, usually by adding 30% hydrogen peroxide to 98% sulfuric acid, and after the set time of insulation, graphite powder and sodium perchlorate are added in sequence; then the set time of insulation at the set temperature is obtained by centrifugation to obtain hydroxylated graphene oxide. Before feeding the hydroxylated graphene oxide rich in proportion into the reactor, it is necessary to ensure its dryness, and therefore, drying pretreatment is required before feeding. The present application is proposed to solve this problem. Utility Model Content

[0004] The purpose of the utility model is to provide a raw material pretreatment device for diethyl oxalate production with a reasonable structure and reliable use, so as to solve the drying problem of the raw material hydroxylated graphene oxide, ensure the drying efficiency on the one hand, and realize precise and rapid feeding on the other hand.

[0005] The technical solution of the utility model is:

[0006] A raw material pretreatment device for producing diethyl oxalate comprises a raw material feeding bin and a stirring structure, and its technical key points are: the raw material feeding bin is composed of a cone bucket and a straight feed pipe connected to the lower end of the cone bucket, an electric heating pipe is evenly coiled on the outer side walls of the straight feed pipe and the cone bucket, a shield surrounding the electric heating pipe is arranged on the outer periphery of the raw material feeding bin, a radial support plate is arranged at the position of the lower end of the electric heating pipe, an upper flange is arranged at the upper end of the cone bucket, an upper edge of the shield is connected and fixed to the upper flange, and a lower edge of the shield is provided with a A lower flange plate is connected to the top surface of the reactor, the lower flange plate is connected and fixed to the radial support plate, a cover plate is provided on the top of the cone bucket, the stirring structure includes a stirring motor fixed to the center of the cover plate, an upper stirring shaft connected to the output end of the stirring motor and located in the cone bucket, a lower stirring shaft connected to the lower end of the upper stirring shaft and located in the linear discharge pipe, an upper stirring blade arranged at the lower part of the upper stirring shaft, and a plurality of lower stirring blades arranged at intervals on the lower stirring shaft, a flow control valve is provided at the lower end of the linear discharge pipe, and a vibrator is fixed to the outer side of the lower end of the linear discharge pipe.

[0007] In the above-mentioned raw material pretreatment device for producing diethyl oxalate, a horizontal cantilever is fixed to one side of the outer lower end of the linear feed pipe, and the vibrator is fixed to the end of the horizontal cantilever.

[0008] In the above-mentioned raw material pretreatment device for producing diethyl oxalate, the center lines of the upper stirring shaft and the lower stirring shaft coincide with the center line of the straight feed pipe.

[0009] In the above-mentioned raw material pretreatment device for producing diethyl oxalate, the upper surface of the radial support plate is provided with a heat insulation ring in contact with the electric heating tube.

[0010] In the above-mentioned raw material pretreatment device for producing diethyl oxalate, the cover plate is provided with a heat dissipation port.

[0011] The above-mentioned raw material pretreatment device for producing diethyl oxalate, the flow control valve includes a roller built into the lower end of a linear feed pipe, a motor reducer arranged outside the linear feed pipe and connected to the roller, and a plurality of feed troughs are evenly arranged on the outer circumference of the roller.

[0012] The beneficial effects of the utility model are:

[0013] 1. The electric heating tube is evenly coiled on the outside of the raw material feeding bin to pre-dry the materials therein. The stirring structure is used to quickly disperse moisture. The raw material feeding bin is composed of a cone bucket and a linear feeding pipe. The linear feeding pipe increases the feeding stroke, thereby increasing the drying stroke, improving the drying efficiency, and solving the drying problem of the raw material hydroxylated graphene oxide.

[0014] 2. A flow control valve and a vibrator are set at the lower end of the linear feed pipe. When the vibrator vibrates, it ensures that the dry material falls fully into the feed trough of the roller of the flow control valve. The motor reducer controls the roller to rotate according to the set cycle to feed the materials in each feed trough to the bottom of the linear feed pipe, thereby realizing precise and rapid feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a cross-sectional view of the roller of the flow control valve.

[0017] In the figure: 1. stirring motor, 2. cover plate, 3. heat dissipation port, 4. upper flange, 5. shield, 6. electric heating tube, 7. upper stirring blade, 8. upper stirring shaft, 9. cone bucket, 10. linear discharge pipe, 11. lower stirring shaft, 12. lower stirring blade, 13. insulation ring, 14. lower flange, 15. radial support plate, 16. motor reducer, 17. horizontal cantilever, 18. vibrator, 19. roller, 20. discharge chute. DETAILED DESCRIPTION

[0018] The utility model is described in detail according to the accompanying drawings of the specification.

[0019] like Figure 1 , Figure 2 As shown, the raw material pretreatment device for producing diethyl oxalate includes a raw material feeding bin and a stirring structure.

[0020] The raw material feeding bin is composed of a cone bucket 9 and a straight feed pipe 10 connected to the lower end of the cone bucket 9. The electric heating tube 6 is evenly coiled on the outer side walls of the straight feed pipe 10 and the cone bucket 9, and a shield 5 surrounding the electric heating tube 6 is provided on the outer periphery of the raw material feeding bin. The straight feed pipe 10 is provided with a radial support plate 15 at the lower end of the electric heating tube 6, and the upper surface of the radial support plate 15 is provided with an insulation ring 13 in contact with the electric heating tube 6. An upper flange 4 is provided at the upper end of the cone bucket 9, and the upper edge of the shield 5 is connected and fixed to the upper flange 4, and a lower flange 14 for connecting to the top surface of the diethyl oxalate reactor is provided at the lower edge of the shield 5, and the lower flange 14 is connected and fixed to the radial support plate 15. A cover plate 2 is provided on the top of the cone bucket 9, and a heat dissipation port 3 is provided on the cover plate 2.

[0021] The stirring structure includes a stirring motor 1 fixed at the center of the cover plate 2, an upper stirring shaft 8 connected to the output end of the stirring motor 1 and located in a conical bucket 9, a lower stirring shaft 11 connected to the lower end of the upper stirring shaft 8 and located in a linear discharge pipe 10, an upper stirring blade 7 arranged at the lower part of the upper stirring shaft 8, and a plurality of lower stirring blades 12 arranged at intervals on the lower stirring shaft 11, and the center lines of the upper stirring shaft 8 and the lower stirring shaft 11 coincide with the center line of the linear discharge pipe 10.

[0022] The lower end of the linear feed pipe 10 is provided with a flow control valve, which includes a roller 19 built into the lower end of the linear feed pipe 10, a motor reducer 16 provided outside the linear feed pipe 10 and connected to the roller 19, and a plurality of feed troughs 20 are evenly provided on the outer circumference of the roller 19. A horizontal cantilever 17 is fixed to one side of the outer end of the lower end of the linear feed pipe 10, and a vibrator 18 is fixed to the end of the horizontal cantilever 17.

[0023] Working principle:

[0024] During operation, the electric heating tube 6 is pre-heated with electricity to preheat the raw material feeding bin, and the hydroxylated graphene oxide-rich powder is placed in the raw material feeding bin. The stirring motor 1 is started to drive the upper and lower stirring shafts and the upper and lower stirring blades to rotate, which is beneficial to heat dissipation on the one hand and to rapid feeding on the other hand. After the set time, the motor reducer 16 and the vibrator 18 are started to drive the roller 16 to rotate the set number of circles, and the materials in each feeding trough 20 are fed under the linear feeding pipe 10 to achieve precise and rapid feeding.

[0025] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A raw material pretreatment device for producing diethyl oxalate, comprising a raw material feeding bin and a stirring structure, characterized in that: The raw material feeding bin is composed of a cone bucket and a straight feed pipe connected to the lower end of the cone bucket, the outer side walls of the straight feed pipe and the cone bucket are evenly coiled with electric heating tubes, the outer periphery of the raw material feeding bin is provided with a shield surrounding the electric heating tube, the straight feed pipe is provided with a radial support plate at the position of the lower end of the electric heating tube, the upper end of the cone bucket is provided with an upper flange, the upper edge of the shield is connected and fixed to the upper flange, the lower edge of the shield is provided with a lower flange for connecting to the top surface of the diethyl oxalate reactor, the lower flange is connected and fixed to the radial support plate, the top of the cone bucket is provided with a cover plate, the stirring structure includes a stirring motor fixed to the center of the cover plate, an upper stirring shaft connected to the output end of the stirring motor and located in the cone bucket, a lower stirring shaft connected to the lower end of the upper stirring shaft and located in the straight feed pipe, an upper stirring blade arranged at the lower part of the upper stirring shaft, and a plurality of lower stirring blades arranged at intervals on the lower stirring shaft, the lower end of the straight feed pipe is provided with a flow control valve, and a vibrator is fixed to the outer side of the lower end of the straight feed pipe.

2. The raw material pretreatment device for diethyl oxalate production according to claim 1, characterized in that: A horizontal cantilever is fixed to one side of the outer lower end of the linear feeding pipe, and the vibrator is fixed to the end of the horizontal cantilever.

3. The raw material pretreatment device for diethyl oxalate production according to claim 1, characterized in that: The center lines of the upper stirring shaft and the lower stirring shaft coincide with the center line of the straight feed pipe.

4. The raw material pretreatment device for diethyl oxalate production according to claim 1, characterized in that: The upper surface of the radial support plate is provided with a heat insulation ring in contact with the electric heating tube.

5. The raw material pretreatment device for diethyl oxalate production according to claim 1, characterized in that: The cover plate is provided with a heat dissipation opening.

6. The raw material pretreatment device for diethyl oxalate production according to claim 1, characterized in that: The flow control valve comprises a roller built into the lower end of a linear feed pipe, a motor reducer arranged outside the linear feed pipe and connected to the roller, and a plurality of feed grooves are evenly arranged on the outer circumference of the roller.

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