Vacuum fractionation device for producing dimethylacetamide

Abstract

The utility model relates to the technical field of fractionation, and discloses a reduced-pressure fractionation device for producing dimethylacetamide, which comprises a bottom plate, a filter box fixedly connected to the upper surface of one end of the bottom plate, a box cover fixedly mounted on the upper surface of the filter box, and a filter plate fixedly connected to the inner wall of the filter box. Due to the arrangement of the filter plates, large-particle impurities can be conveniently filtered out, the fractionation effect is improved, and the number of the filter plates is three. The utility model has the following advantages and effects: through the arrangement of the filter box, the negative pressure tower and the fractionating tower, a worker firstly introduces a material into the filter box, firstly filters the material and then introduces the material into the negative pressure tower, part of impurities are separated out by utilizing negative pressure, heavy liquid is discharged from the heavy liquid discharge pipe and is convenient to recycle, and the rest of the material is introduced into the fractionating tower for fractionating, so that the fractionating efficiency is improved. And the dimethylacetamide is discharged from the material discharge pipe without adding other substances, so that the effects of low consumption and low cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fractionation, in particular to a vacuum fractionation device for producing dimethylacetamide. Background Art

[0002] Dimethylacetamide is an important basic chemical raw material with good solubility. It is widely used as an additive in the medical, textile, coating and other industries. The current production processes of N,N-dimethylacetamide mainly include the anhydride method, the acetyl chloride method and the acetic acid method. Among them, the acetic acid method uses acetic acid and dimethylamine as raw materials to synthesize N,N-dimethylacetamide. This method has the advantages of low energy consumption, high economic benefits, and suitability for continuous large-scale production. It is the main method for producing N,N-dimethylacetamide in China.

[0003] According to Chinese Patent No. CN101462977A, a method for purifying dimethylacetamide is provided. The method comprises dehydrating a preheated crude N,N-dimethylacetamide raw material in a first distillation tower, and then feeding the raw material into a second distillation tower to remove acetic acid to obtain N,N-dimethylacetamide at the top of the tower. The bottom liquid of the second distillation tower is fed into a neutralizer for neutralization, and the neutralized neutral solution is fed into an evaporator to volatilize the N,N-dimethylacetamide and water therein in a gaseous state. After condensation in a condenser, the solution is then fed into the first distillation tower for dehydration. The patented method for purifying N,N-dimethylacetamide increases the recovery rate of N,N-dimethylacetamide to over 97%. The obtained N,N-dimethylacetamide has indicators that fully meet the requirements for use as a solution spinning solvent for elastic polyurethane block copolymers. In addition, the wastewater and waste generated during the distillation process of the present invention have low pollution and are environmentally friendly.

[0004] The above patent has a good environmental protection effect, but it requires the addition of alkaline substances, which causes complex processes and consumption problems. Utility Model Content

[0005] The purpose of the utility model is to provide a vacuum fractionation device for producing dimethylacetamide, which has the effects of low consumption and low cost.

[0006] The above technical purpose of the present utility model is achieved through the following technical solutions: a vacuum distillation device for the production of dimethylacetamide, comprising a base plate, the upper surface of one end of the base plate is fixedly connected to a filter box, the bottom of one side of the filter box is fixedly connected to a first pump, one end of the first pump is fixedly connected to a negative pressure tower, the upper surface of the negative pressure tower is fixedly connected to the negative pressure pump, the middle part of the surface of the negative pressure pump is fixedly connected to a heavy liquid discharge pipe, the middle part of one side of the negative pressure pump is fixedly connected to a second pump, one end of the second pump is fixedly connected to a distillation tower, the middle part of the lower surface of the distillation tower is fixedly connected to a reactant discharge port, the upper surface of the distillation tower is fixedly connected to a cooler, the lower part of the cooler is fixedly connected to a material discharge pipe, and one side of the filter box is fixedly connected to a feed flange.

[0007] By adopting the above technical solution, through the setting of the filter box, negative pressure tower and distillation tower, the workers first pass the material into the filter box, filter it, and then pass it into the negative pressure tower. The negative pressure is used to precipitate some impurities, and the heavy liquid is discharged from the heavy liquid discharge pipe for easy recovery. The rest is passed into the distillation tower for fractionation, and dimethylacetamide is discharged from the material discharge pipe. There is no need to add other substances, so the effect of low consumption and low cost is achieved.

[0008] The present invention is further configured as follows: a box cover is fixedly mounted on the upper surface of the filter box, and a filter plate is fixedly connected to the inner wall of the filter box.

[0009] By adopting the above technical solution, the setting of the box cover makes it easy to inspect and repair the filter box, thereby increasing its service life. The setting of the filter plate makes it easy to filter out large particles of impurities, thereby improving the distillation effect.

[0010] The present invention is further configured as follows: the number of the filter plates is three, and the three filter plates are fixedly connected to the inner wall of the filter box in the form of an array.

[0011] By adopting the above technical solution, the arrangement of three filter plates can improve the filtering effect and thus improve the fractionation effect.

[0012] The present invention is further configured as follows: the lower surface of the first pump is fixedly connected to the upper surface of the bottom plate.

[0013] By adopting the above technical solution, the provision of the first pump can improve the connectivity of the device and prevent tipping.

[0014] The present invention is further configured as follows: the lower surface of the negative pressure tower is fixedly connected to a negative pressure tower base, and the lower surface of the negative pressure tower base is fixedly connected to the upper surface of the bottom plate.

[0015] By adopting the above technical solution, the arrangement of the negative pressure tower base can strengthen the connection of the device and prevent the device from being dispersed.

[0016] The present invention is further configured as follows: one end of the negative pressure pump is fixedly connected to a purification box, and a filter is provided on the outer surface of the purification box.

[0017] By adopting the above technical solution, the arrangement of the purification box and the filter facilitates purification of the device and prevents the device from polluting the environment.

[0018] The present invention is further configured as follows: the outer surface of the heavy liquid discharge pipe is arranged on the inner wall of the negative pressure tower base.

[0019] By adopting the above technical solution, the provision of the heavy liquid discharge pipe can improve the connectivity of the device and make the device connection more stable.

[0020] The present invention is further configured as follows: a fractionation tower mounting base is fixedly connected to the lower surface of the fractionation tower, and a hot gas inlet end is fixedly connected to the lower side of one side of the fractionation tower.

[0021] By adopting the above technical solution, the arrangement of the mounting base improves the installation stability of the fractionation tower, and the arrangement of the hot gas inlet end ensures a normal fractionation effect.

[0022] The present invention is further configured as follows: one end of the cooler is fixedly connected to an exhaust hole, and one end of the reactant discharge port passes through the fractionation tower mounting seat and is arranged on the front side of the fractionation tower mounting seat.

[0023] By adopting the above technical solution, the setting of the reactant discharge port can recover the reactant, which can be recovered while preventing pollution and reducing costs. The setting of the exhaust hole can discharge water vapor and improve the purity of dimethylacetamide.

[0024] The present invention is further configured as follows: one end of the material discharge pipe is fixedly connected to a reflux end, and the reflux end is fixedly connected above a side surface of the distillation tower.

[0025] By adopting the above technical solution, the setting of the reflux end can ensure normal reflux of the device and improve the distillation accuracy.

[0026] The beneficial effects of the utility model are as follows: through the arrangement of the filter box, the negative pressure tower and the fractionating tower, workers first pass the material into the filter box, filter it first, and then pass it into the negative pressure tower, using the negative pressure to precipitate part of the impurities, and the heavy liquid is discharged from the heavy liquid discharge pipe for easy recovery, and the rest is passed into the fractionating tower for fractionation, and dimethylacetamide is discharged from the material discharge pipe, without the need to add other substances, thereby achieving the effects of low consumption and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the shaft side structure of the utility model;

[0029] Figure 2 This is a schematic diagram of the cross-sectional structure of the filter box of the utility model;

[0030] Figure 3 For this utility model Figure 1 Schematic diagram of the structure at A in the middle;

[0031] Figure 4 This is a schematic diagram of the cross-sectional structure of the negative pressure tower of the present invention.

[0032] In the figure, 1. bottom plate; 2. filter box; 3. first pump; 4. negative pressure tower; 5. negative pressure pump; 6. heavy liquid discharge pipe; 7. second pump; 8. distillation tower; 9. reactant discharge port; 10. cooler; 11. material discharge pipe; 12. feed flange; 13. box cover; 14. filter plate; 15. negative pressure tower base; 16. purification box; 17. filter screen; 18. distillation tower mounting base; 19. hot gas inlet port; 20. exhaust hole; 21. reflux port. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0034] Reference Figure 1-4, a vacuum fractionation device for the production of dimethylacetamide, comprising a bottom plate 1, a filter box 2 is fixedly connected to the upper surface of one end of the bottom plate 1, a box cover 13 is fixedly installed on the upper surface of the filter box 2, a filter plate 14 is fixedly connected to the inner wall of the filter box 2, the setting of the box cover is convenient for maintenance of the filter box, and the service life is improved. The setting of the filter plate is convenient for filtering out large particles of impurities and improving the fractionation effect. The number of filter plates 14 is three, and the three filter plates 14 are fixedly connected to the inner wall of the filter box 2 in the form of an array. The setting of the three filter plates can improve the filtering effect and thus improve the fractionation effect. The bottom of one side of the filter box 2 is fixedly connected to a first pump 3, and the lower surface of the first pump 3 is fixedly connected Connected to the upper surface of the base plate 1, the setting of the first pump can improve the connectivity of the device and prevent it from tipping over. One end of the first pump 3 is fixedly connected to the negative pressure tower 4, and the lower surface of the negative pressure tower 4 is fixedly connected to the negative pressure tower base 15. The lower surface of the negative pressure tower base 15 is fixedly connected to the upper surface of the base plate 1. The setting of the negative pressure tower base can strengthen the connection of the device and prevent the device from being discrete. The upper surface of the negative pressure tower 4 is fixedly connected to the negative pressure pump 5, and one end of the negative pressure pump 5 is fixedly connected to the purification box 16. The outer surface of the purification box 16 is provided with a filter 17. The setting of the purification box and the filter facilitates the purification of the device and prevents the device from polluting the environment. The middle part of the surface of the negative pressure pump 5 is fixedly connected to the heavy liquid discharge pipe 6. The outer surface of the heavy liquid discharge pipe 6 is arranged on the inner wall of the negative pressure tower base 15. The arrangement of the heavy liquid discharge pipe 6 can improve the connectivity of the device and make the device connection more stable. The middle part of one side of the negative pressure pump 5 is fixedly connected to the second pump 7, and one end of the second pump 7 is fixedly connected to the distillation tower 8. The lower surface of the distillation tower 8 is fixedly connected to the distillation tower mounting seat 18, and the lower part of one side of the distillation tower 8 is fixedly connected to the hot air inlet end 19. The arrangement of the mounting seat improves the installation stability of the distillation tower, and the arrangement of the hot air inlet end ensures the normal fractionation effect. The middle part of the lower surface of the distillation tower 8 is fixedly connected to the reactant discharge port 9, and the upper surface of the distillation tower 8 is fixedly connected to the cooler 10. The cooler 1 0 is fixedly connected to an exhaust hole 20, and one end of the reactant discharge port 9 passes through the distillation tower mounting base 18 and is arranged on the front of the distillation tower mounting base 18. The setting of the reactant discharge port can recover the reactant, and can recover it while preventing pollution, thereby reducing costs. The setting of the exhaust hole can discharge water vapor and improve the purity of dimethylacetamide. A material discharge pipe 11 is fixedly connected to the bottom of the cooler 10, and one end of the material discharge pipe 11 is fixedly connected to a reflux end 21. The reflux end 21 is fixedly connected to the top of one side of the distillation tower 8. The setting of the reflux end can ensure normal reflux of the device and improve the distillation accuracy. A feed flange 12 is fixedly connected to one side of the filter box 2.

[0035] In the utility model, workers first pass the material into the filter box 2 for filtration, and then pass it into the negative pressure tower 4. The negative pressure is used to precipitate some impurities, and the heavy liquid is discharged from the heavy liquid discharge pipe 6 for easy recovery. The rest is passed into the fractionation tower 8 for fractionation, and dimethylacetamide is discharged from the material discharge pipe 11. No other substances need to be added, so the effect of low consumption and low cost is achieved.

[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum fractionation device for producing dimethylacetamide, comprising a bottom plate (1), characterized in that: The upper surface of one end of the base plate (1) is fixedly connected to a filter box (2), the bottom of one side of the filter box (2) is fixedly connected to a first pump (3), one end of the first pump (3) is fixedly connected to a negative pressure tower (4), the upper surface of the negative pressure tower (4) is fixedly connected to a negative pressure pump (5), the middle of the surface of the negative pressure pump (5) is fixedly connected to a heavy liquid discharge pipe (6), the middle of one side of the negative pressure pump (5) is fixedly connected to a second pump (7), one end of the second pump (7) is fixedly connected to a distillation tower (8), the middle of the lower surface of the distillation tower (8) is fixedly connected to a reactant discharge port (9), the upper surface of the distillation tower (8) is fixedly connected to a cooler (10), the lower part of the cooler (10) is fixedly connected to a material discharge pipe (11), and one side of the filter box (2) is fixedly connected to a feed flange (12).

2. A vacuum fractionation device for producing dimethylacetamide according to claim 1, characterized in that: A box cover (13) is fixedly mounted on the upper surface of the filter box (2), and a filter plate (14) is fixedly connected to the inner wall of the filter box (2).

3. A vacuum fractionation device for producing dimethylacetamide according to claim 2, characterized in that: The number of the filter plates (14) is three, and the three filter plates (14) are fixedly connected to the inner wall of the filter box (2) in the form of an array.

4. A vacuum fractionation device for producing dimethylacetamide according to claim 1, characterized in that: The lower surface of the first pump (3) is fixedly connected to the upper surface of the base plate (1).

5. A vacuum fractionation device for producing dimethylacetamide according to claim 1, characterized in that: The lower surface of the negative pressure tower (4) is fixedly connected to a negative pressure tower base (15), and the lower surface of the negative pressure tower base (15) is fixedly connected to the upper surface of the bottom plate (1).

6. A vacuum fractionation device for producing dimethylacetamide according to claim 1, characterized in that: One end of the negative pressure pump (5) is fixedly connected to a purification box (16), and a filter screen (17) is provided on the outer surface of the purification box (16).

7. A vacuum fractionation device for producing dimethylacetamide according to claim 1, characterized in that: The outer surface of the heavy liquid discharge pipe (6) is arranged on the inner wall of the negative pressure tower base (15).

8. A vacuum fractionation device for producing dimethylacetamide according to claim 1, characterized in that: A fractionation tower mounting base (18) is fixedly connected to the lower surface of the fractionation tower (8), and a hot gas inlet end (19) is fixedly connected to the lower side of one side of the fractionation tower (8).

9. A vacuum fractionation device for producing dimethylacetamide according to claim 1, characterized in that: One end of the cooler (10) is fixedly connected to an exhaust hole (20), and one end of the reactant discharge port (9) passes through the fractionation tower mounting base (18) and is arranged on the front of the fractionation tower mounting base (18).

10. The vacuum fractionation device for producing dimethylacetamide according to claim 1, characterized in that: One end of the material discharge pipe (11) is fixedly connected to a reflux end (21), and the reflux end (21) is fixedly connected above one side of the fractionation tower (8).

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