DMF (Dimethyl Formamide) evaporation system

Abstract

The utility model relates to the technical field of evaporation systems, in particular to a DMF (Dimethyl Formamide) evaporation system which comprises a loop formed by connecting an evaporation concentration separator, a filtering circuit and a heating circuit in series, the filter line comprises a filter branch I and a filter branch II which are connected in parallel, a filter is arranged on the filter branch I, and a cyclone separator is arranged on the filter branch II; the filter branch I comprises a filter inlet pipe and a filter outlet pipe which are respectively connected with an inlet and an outlet of the filter; a desilting opening of the cyclone separator is connected with an inlet pipe of the filter through a pipeline I; according to the DMF evaporation system disclosed by the utility model, materials are firstly filtered by the filtering branch I and the filtering branch II and then enter the heating circuit to be heated, so that the filtering and heating efficiency is improved, and the evaporation and purification effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporation systems, in particular to a DMF evaporation system. Background Art

[0002] DMF is a good solvent for many organic and inorganic substances, so it is often used as a reaction catalyst in reactions. The process of producing DMF is to use anhydrous dimethylamine and CO as raw materials, and use sodium methoxide methanol solution as a catalyst solvent to complete the acylation reaction by gas-liquid contact at a certain temperature and pressure; the reaction formula is: CO+(CH3)2NH→HCON(CH3)2; after the reaction, the crude DMF generated enters the evaporation concentration separator for evaporation and purification; a heater is used to heat the raw materials during the evaporation process; this method has good product quality and low cost, but it also has some disadvantages, such as the catalyst sodium methoxide is easy to react with the impurities water, oxygen, and carbon dioxide brought by the raw materials to form sodium formate and sodium carbonate crystals, and it is easy to attach to the equipment and pipe walls in the system and further accumulate, causing the physical properties of the liquid and the gas-liquid flow performance to deteriorate, affecting the operation cycle of the system, so a filter device is needed to filter the impurities.

[0003] The patent with authorization announcement number CN2728587Y-A dimethylformamide evaporation device discloses an evaporator in a DMF (dimethylformamide) synthesis process; it includes a separator, a heater, a filter, and a circulating pump, and the heater is placed outside the separator; the heater, separator and circulating pump are connected in series to form one loop; the separator, filter and circulating pump are connected in series to form another loop, and the two loops are connected in parallel; the disadvantage of this patent scheme is that one loop is only filtered by the filter, and the other loop is only deheated by the heater, the heating and filtering efficiency is low, resulting in poor evaporation and purification effect. Utility Model Content

[0004] The main purpose of the utility model is to provide a DMF evaporation system to solve the problems of low heating and filtering efficiency and poor evaporation and purification effect of the DMF evaporation device in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a DMF evaporation system, including a loop formed by an evaporation concentration separator, a filtering circuit, and a heating circuit connected in series; the filtering circuit includes a filtering branch one and a filtering branch two connected in parallel, a filter is provided on the filtering branch one, and a cyclone separator is provided on the filtering branch two; the filtering branch one includes a filter inlet pipe and a filter outlet pipe respectively connected to the inlet and outlet of the filter; the sand settling port of the cyclone separator is connected to the filter inlet pipe through a pipe one.

[0006] Furthermore, a circulation pump is provided on both the first filter branch and the second filter branch.

[0007] Furthermore, the heating circuit includes a heating branch 1 and a heating branch 2 connected in parallel, and heaters are provided on both the heating branch 1 and the heating branch 2.

[0008] Furthermore, pipeline one is connected with a flushing water pipe.

[0009] Furthermore, the evaporation concentration separator is connected with a material inlet pipe.

[0010] Furthermore, a demister is provided inside the evaporation concentration separator.

[0011] In the DMF evaporation system of the utility model, the material is first filtered through the first filter branch and the second filter branch, and then enters the heating circuit for heating, thereby improving the efficiency of filtering and heating and ensuring the effect of evaporation and purification.

[0012] The utility model introduces the impurities separated by the cyclone separator of the second filter branch into the filter in the first filter separator, so as to separate the impurities uniformly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0014] Figure 1 It is a structural schematic diagram of an embodiment;

[0015] In the figure: 1. Evaporation concentration separator; 2. Filter; 3. Cyclone separator; 4. Pipeline 1; 5. Filter inlet pipe; 6. Filter outlet pipe; 7. Heater; 8. Flushing water pipe; 9. Material inlet pipe; 10. Defoamer; 11. Circulation pump. DETAILED DESCRIPTION

[0016] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0017] like Figure 1As shown, according to an embodiment of the utility model, a DMF evaporation system is provided, comprising a loop formed by an evaporation concentration separator 1, a filtering circuit, and a heating circuit connected in series; the filtering circuit comprises a filtering branch 1 and a filtering branch 2 connected in parallel, a filter 2 is provided on the filtering branch 1, and a cyclone separator 3 is provided on the filtering branch 2; the filtering branch 1 comprises a filter inlet pipe 5 and a filter outlet pipe 6 respectively connected to the inlet and outlet of the filter 2; the sand settling port of the cyclone separator 3 is connected to the filter inlet pipe 5 through a pipeline 1 4; the pipeline 1 4 is connected to a flushing water pipe 8, and the flushing water pipe 8 is used to flush the impurities filtered out by the cyclone separator 3 along the pipeline 1 4, and the impurities finally enter the filter 2, and the filter 2 filters and separates the impurities uniformly.

[0018] A circulation pump 11 is provided on both the first filter branch and the second filter branch.

[0019] The heating circuit includes a heating branch 1 and a heating branch 2 connected in parallel. A heater 7 is provided on both the heating branch 1 and the heating branch 2. The heater 7 is a steam heater.

[0020] The evaporation concentration separator 1 is connected to a material inlet pipe 9 ; a defoamer 10 is provided at the top of the interior of the evaporation concentration separator 1 .

[0021] The working principle of this embodiment is:

[0022] The crude DMF at the outlet of the DMF synthesis tower enters the evaporation concentration separator 1 through the material inlet pipe 9 for evaporation concentration. The DMF evaporated into gas phase passes through the demister 10 and enters the primary distillation tower for purification of DMF in the next process.

[0023] During the evaporation and concentration process, the crude DMF in the evaporation and concentration separator 1 is cyclically filtered and heated through the filtering circuit and the heating circuit; the impurities in the crude DMF can be removed by filtering through the filter 2 and the cyclone separator 3 to prevent the impurities from adhering to the equipment and pipe walls in the system; the crude DMF is heated by the heater 7 to reach a specific temperature.

[0024] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A DMF evaporation system, characterized in that, The invention comprises a loop formed by a series connection of an evaporation concentration separator (1), a filtering circuit, and a heating circuit; the filtering circuit comprises a filtering branch path 1 and a filtering branch path 2 connected in parallel; the filtering branch path 1 is provided with a filter (2), and the filtering branch path 2 is provided with a cyclone separator (3); the filtering branch path 1 comprises a filter inlet pipe (5) and a filter outlet pipe (6) respectively connected to the inlet and outlet of the filter (2); and the sand settling port of the cyclone separator (3) is connected to the filter inlet pipe (5) via a pipe path 1 (4).

2. The DMF evaporation system as claimed in claim 1, characterized in that, The first filter branch and the second filter branch are both provided with a circulation pump (11).

3. The DMF evaporation system as claimed in claim 1, characterized in that, The heating circuit comprises a first heating branch and a second heating branch connected in parallel, and a heater (7) is provided on each of the first heating branch and the second heating branch.

4. The DMF evaporation system as claimed in claim 1, characterized in that, The pipeline 1 (4) is connected to a flushing water pipe (8).

5. The DMF evaporation system as claimed in claim 1, characterized in that, The evaporation concentration separator (1) is connected to a material inlet pipe (9).

6. The DMF evaporation system as claimed in claim 1, characterized in that, A defoamer (10) is provided inside the evaporation concentration separator (1).

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