Distillation device for the production of 3,5-dichloro-2-pentanone and its control method

Abstract

The present invention relates to the technical field of chemical synthesis reactions and distillation equipment, and particularly to a distillation device for the production of 3,5-dichloro-2-pentanone and its control method; the distillation device for the production of 3,5-dichloro-2-pentanone includes: a hydrochloric acid storage tank; a raw material storage tank; a first distillation furnace body, in which a first liquid level sensor is connected; a first connecting pipe, the first connecting pipe is connected between a sulfuric acid storage tank and the first distillation furnace body, the first connecting pipe is connected with a first electric control valve and a first flowmeter, and the first flowmeter and the first electric control valve are electrically connected; the first connecting pipe is connected with a second electric control valve, and the second electric control valve is electrically connected with the first liquid level sensor; etc. Through improvement, it can realize large-scale industrialized and automated preparation of 3,5-dichloro-2-pentanone, and can alleviate the problem that by-products block the channel and are difficult to clean due to the change of the ratio of raw materials and hydrochloric acid in the first distillation furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical synthesis reactions and distillation equipment, and particularly to a distillation device for the production of 3,5-dichloro-2-pentanone and a control method thereof. Background Art

[0002] 3,5-Dichloro-2-pentanone is an important chemical intermediate. The existing production process uses α-acetyl-α-chloro-γ-butyrolactone as a raw material, and under the condition of being mixed with hydrochloric acid in a specific ratio, it is subjected to a distillation reaction in a distillation furnace to produce 3,5-dichloro-2-pentanone. Due to the lack of a structure for real-time adjustment of the ratio of the raw material and hydrochloric acid in the existing distillation furnace structure, the distillation reaction time of the raw material in the distillation furnace at high temperature is long, which causes the ratio of the raw material and hydrochloric acid in the distillation furnace to change, resulting in more side reactions in the distillation furnace to produce impurities such as tar, which easily clog the channels of the distillation device and are difficult to clean. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to provide a distillation device for the production of 3,5-dichloro-2-pentanone and a control method thereof, which can alleviate the problem that the by-products clog the channels and are difficult to clean due to the change in the ratio of the raw material and hydrochloric acid in the distillation furnace.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is:

[0005] A distillation device for the production of 3,5-dichloro-2-pentanone, comprising:

[0006] A hydrochloric acid storage tank;

[0007] A raw material storage tank;

[0008] A first distillation furnace body, and a first liquid level sensor is connected inside the first distillation furnace body;

[0009] A first connecting pipe, the first connecting pipe is connected between the hydrochloric acid storage tank and the first distillation furnace body, the first connecting pipe is connected with a first electric control valve and a first flow meter, and the first flow meter and the first electric control valve are electrically connected; the first connecting pipe is connected with a second electric control valve, and the second electric control valve is electrically connected with the first liquid level sensor;

[0010] A second connecting pipe, the second connecting pipe is connected between the raw material storage tank and the first distillation furnace body, the first connecting pipe is connected with a third electric control valve and a second flow meter, and the second flow meter and the third electric control valve are electrically connected; the second connecting pipe is connected with a fourth electric control valve, and the fourth electric control valve is electrically connected with the first liquid level sensor;

[0011] An automatic oil-water separator;

[0012] The third connecting pipe, which is connected between the first distillation furnace body and the automatic oil-water separator;

[0013] The first condensation device, which is connected to the third connecting pipe;

[0014] The oil product storage tank;

[0015] The fourth connecting pipe, which is connected between the automatic oil-water separator and the oil product storage tank;

[0016] The first distilled water storage tank;

[0017] The fifth connecting pipe, which is connected between the automatic oil-water separator and the first distilled water storage tank;

[0018] The first distillation furnace circulation pipe, with both ends respectively connected to the first distillation furnace body;

[0019] The first circulation pump, which is connected to the first distillation furnace circulation pipe;

[0020] The first steam heating device, which is connected to the first distillation furnace circulation pipe;

[0021] The second distillation furnace body, with a second liquid level sensor provided therein;

[0022] The sixth connecting pipe, with one end connected to the first distillation furnace circulation pipe and the other end connected to the second distillation furnace body; the sixth connecting pipe is connected with a fifth electric control valve, a third flowmeter and a sixth electric control valve, the third flowmeter is electrically connected to the fifth electric control valve, and the first liquid level sensor is electrically connected to the sixth electric control valve;

[0023] The second distilled water storage tank;

[0024] The seventh connecting pipe, which is connected between the second distillation furnace and the second distilled water storage tank;

[0025] The second condensation device, which is connected to the seventh connecting pipe;

[0026] The second distillation furnace circulation pipe, with both ends respectively connected to the second distillation furnace body;

[0027] The second steam heating device, which is connected to the second distillation furnace circulation pipe;

[0028] The second circulation pump, which is connected to the second distillation furnace circulation pipe;

[0029] The residue collection kettle;

[0030] The eighth connecting pipe, one end of the eighth connecting pipe is connected to the second distillation furnace circulation pipe, and the other end is connected to the residue collection kettle; the eighth connecting pipe is connected with a seventh electric control valve, a fourth flow meter and an eighth electric control valve, the fourth flow meter is electrically connected with the seventh electric control valve, and the second liquid level sensor is electrically connected with the eighth electric control valve.

[0031] Further, in the above continuous production device of 3,5-dichloro-2-pentanone, a section between the first condensation device of the third connecting pipe and the automatic oil-water separator is connected with a tail gas absorption pipe, and the end of the tail gas absorption pipe is connected to the tail gas absorption tower.

[0032] Further, in the distillation device for the production of 3,5-dichloro-2-pentanone, the diameters of the fifth connecting pipe, the sixth connecting pipe, the seventh connecting pipe and the eighth connecting pipe are all larger than those of the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe.

[0033] The present invention also relates to a control method for a distillation device for the production of 3,5-dichloro-2-pentanone. Based on the above continuous production device of 3,5-dichloro-2-pentanone, the control method includes the following steps:

[0034] Adjust the opening of the first electric control valve according to the set first flow rate, and keep the hydrochloric acid solution in the hydrochloric acid storage tank flowing into the first distillation furnace body at the first flow rate through the first flow meter;

[0035] At the same time, adjust the opening of the third electric control valve according to the set second flow rate, and keep the raw material solution in the raw material storage tank flowing into the first distillation furnace body at the second flow rate through the second flow meter;

[0036] After the hydrochloric acid and the raw materials in the first distillation furnace body are mixed, they circulate between the first distillation furnace circulation pipe and the first distillation furnace body through the first circulation pump, so that the flowing mixed liquid is heated by the first steam heating device; the mixed liquid in the first distillation furnace body is heated up, and the generated steam passes through the third connecting pipe and is condensed by the first condensation device to obtain condensate. The condensate enters the automatic oil-water separation device to separate out the 3,5-dichloro-2-pentanone product and the distilled water. The 3,5-dichloro-2-pentanone product is shunted to the 3,5-dichloro-2-pentanone storage tank, and the distilled water is shunted to the distilled water storage tank;

[0037] Adjust the opening of the fifth electric control valve according to the preset third flow rate, and keep the solution in the first distillation furnace circulation pipe flowing into the second distillation furnace body at the third flow rate through the third flow meter;

[0038] When the first liquid level sensor senses that the liquid level in the first distillation furnace body is higher than the first threshold, control the second electric control valve and the fourth electric control valve to close, and the first distillation furnace body stops feeding; when the first liquid level sensor senses that the liquid level in the first distillation furnace body is lower than the second threshold, control the second electric control valve and the fourth electric control valve to open;

[0039] When the first liquid level sensor senses that the liquid level in the first distillation furnace body is lower than the third threshold, control the sixth electric control valve to close; when the first liquid level sensor senses that the liquid level in the first distillation furnace body is higher than the fourth threshold, control the sixth electric control valve to open; the third threshold, the second threshold, the fourth threshold, and the first threshold increase in sequence.

[0040] The solution entering the second distillation furnace body circulates between the second distillation furnace circulation pipe and the second distillation furnace body through the second circulation pump, so that the flowing solution is heated by the second steam heating device; the solution in the second distillation furnace body is heated up, and the generated steam passes through the seventh connecting pipe and is cooled by the second condensing device to obtain a coolant, and the coolant enters the second distilled water storage tank.

[0041] Adjust the opening degree of the seventh electric control valve according to the preset fourth flow rate, and keep the solution in the second distillation furnace circulation pipe at the fourth flow rate and divert it to the residue collection kettle through the fourth flow meter.

[0042] When the second liquid level sensor senses that the liquid level in the second distillation furnace body is higher than the fifth threshold, control the sixth electric control valve to close; when the second liquid level sensor senses that the liquid level in the second distillation furnace body is lower than the sixth threshold, control the sixth electric control valve to open.

[0043] When the second liquid level sensor senses that the liquid level in the second distillation furnace body is lower than the seventh threshold, control the eighth electric control valve to close; when the second liquid level sensor senses that the liquid level in the second distillation furnace body is higher than the eighth threshold, control the eighth electric control valve to open; the seventh threshold, the sixth threshold, the eighth threshold, and the fifth threshold increase in sequence.

[0044] Further, in the control method of the distillation device for the production of 3,5-dichloro-2-pentanone, the ratio of the first flow rate to the second flow rate is 2:1.

[0045] Further, in the control method of the distillation device for the production of 3,5-dichloro-2-pentanone, the ratio of the first flow rate to the third flow rate is 3-4:1.

[0046] Further, in the control method of the distillation device for the production of 3,5-dichloro-2-pentanone, the ratio of the first flow rate to the fourth flow rate is 3-4:1.

[0047] The beneficial effects of the present invention are as follows: Based on the original distillation furnace, this application adopts a specific pipeline connection method, in conjunction with the corresponding connection positions of the electric control valves and the flow control and liquid level control mechanisms, to achieve continuous feeding during the production process of 3,5-dichloro-2-pentanone products. Compared with the traditional intermittent feeding, the process of heating up and cooling down is omitted, the utilization rate of the equipment is improved, and the production capacity is increased; the labor control cost is reduced; due to the addition of a sixth connecting pipe for quantitative shunting connected to the second distillation furnace body beside the bypass of the first distillation furnace circulation pipe, the dilute solution in the first distillation furnace body is continuously shunted into the second distillation furnace for additional distillation reaction, solving the problem that by-products are easily generated in the steam pipeline after the solution is distilled and diluted in the original intermittent feeding, and also ensuring that the 3,5-dichloro-2-pentanone oil phase in the steam continuously generated in the first distillation furnace body is sufficient, and a high-quality 3,5-dichloro-2-pentanone product can be obtained through the automatic oil-water separator normally. The solution quantitatively introduced into the second distillation furnace has a reduced concentration of 3,5-dichloro-2-pentanone oil phase in the steam due to the previous distillation reaction, and by-products such as tar are easily generated, but it can ensure that no side reactions occur in the pipeline connecting the first distillation furnace for the main reaction, avoiding the reduction of the aperture or blockage of the pipeline connecting the first distillation furnace and affecting the reaction continuity and product quality; since the by-products are concentrated in the pipeline connected to the second distillation furnace, it is convenient for subsequent positioning and cleaning, reducing the cleaning difficulty of the by-products.

[0048] Furthermore, this application also increases the pipe diameter of the pipeline connected to the second distillation furnace to avoid blockage of the corresponding pipeline due to by-products generated during the distillation process of the second distillation furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic structural diagram of a distillation device for the production of 3,5-dichloro-2-pentanone according to a specific embodiment of the present invention;

[0050] Label Description:

[0051] 1. Hydrochloric acid storage tank;

[0052] 2. Raw material storage tank;

[0053] 3. First distillation furnace body; 31. First liquid level sensor;

[0054] 4. First connecting pipe; 41. First electric control valve; 42. First flowmeter; 43. Second electric control valve;

[0055] 5. Second connecting pipe; 51. Third electric control valve; 52. Second flowmeter; 53. Fourth electric control valve;

[0056] 6. Automatic oil-water separator;

[0057] 7. Third connecting pipe; 71. First condensation device;

[0058] 8. Oil product storage tank;

[0059] 9. Fourth connecting pipe;

[0060] 10. First distilled water storage tank;

[0061] 11. Fifth connecting pipe;

[0062] 12. First distillation furnace circulation pipe; 121. First circulation pump;

[0063] 13. First steam heating device;

[0064] 14. Second distillation furnace body; 141. Second liquid level sensor;

[0065] 15. Sixth connecting pipe; 151. Fifth electric control valve; 152. Third flowmeter; 153. Sixth electric control valve;

[0066] 16. Second distilled water storage tank;

[0067] 17. Seventh connecting pipe; 171. Second condensation device;

[0068] 18. Second distillation furnace circulation pipe;

[0069] 19. Second steam heating device;

[0070] 20. Second circulation pump;

[0071] 21. Residue collection kettle;

[0072] 22. Eighth connecting pipe; 221. Seventh electric control valve; 222. Fourth flowmeter; 223. Eighth electric control valve. Detailed implementation mode

[0073] To describe in detail the technical content, achieved objectives and effects of the present invention, the following is described in conjunction with the implementation modes and with reference to the drawings.

[0074] Please refer to Figure 1 , the detailed implementation mode of the present invention relates to a distillation device for the production of 3,5-dichloro-2-pentanone, including:

[0075] Hydrochloric acid storage tank 1;

[0076] Raw material storage tank 2;

[0077] First distillation furnace body 3, and a first liquid level sensor 31 is connected inside the first distillation furnace body 3;

[0078] The first connecting pipe 4, the first connecting pipe 4 is connected between the hydrochloric acid storage tank 1 and the first distillation furnace body 3. The first connecting pipe 4 is connected with a first electric control valve 41 and a first flowmeter 42, and the first flowmeter 42 is electrically connected with the first electric control valve 41; The first connecting pipe 4 is connected with a second electric control valve 43, and the second electric control valve 43 is electrically connected with the first liquid level sensor 31;

[0079] The second connecting pipe 5, the second connecting pipe 5 is connected between the raw material storage tank 2 and the first distillation furnace body 3. The first connecting pipe 4 is connected with a third electric control valve 51 and a second flowmeter 52, and the second flowmeter 52 is electrically connected with the third electric control valve 51; The second connecting pipe 5 is connected with a fourth electric control valve 53, and the fourth electric control valve 53 is electrically connected with the first liquid level sensor 31;

[0080] Automatic oil-water separator 6;

[0081] The third connecting pipe 7, the third connecting pipe 7 is connected between the first distillation furnace body 3 and the automatic oil-water separator 6;

[0082] The first condensation device 71, the first condensation device 71 is connected to the third connecting pipe 7;

[0083] Oil product storage tank 8;

[0084] The fourth connecting pipe 9, the fourth connecting pipe 9 is connected between the automatic oil-water separator 6 and the oil product storage tank 8;

[0085] The first distilled water storage tank 10;

[0086] The fifth connecting pipe 11, the fifth connecting pipe 11 is connected between the automatic oil-water separator 6 and the first distilled water storage tank 10;

[0087] The first distillation furnace circulation pipe 12, both ends of the first distillation furnace circulation pipe 12 are respectively connected to the first distillation furnace body 3;

[0088] The first circulation pump 121, the first circulation pump 121 is connected to the first distillation furnace circulation pipe 12;

[0089] The first steam heating device 13, the first steam heating device 13 is connected to the first distillation furnace circulation pipe 12;

[0090] The second distillation furnace body 14, a second liquid level sensor 141 is arranged in the second distillation furnace body 14;

[0091] The sixth connecting pipe 15, one end of the sixth connecting pipe 15 is connected to the first distillation furnace circulation pipe 12, and the other end is connected to the second distillation furnace body 14; a fifth electric control valve 151, a third flowmeter 152 and a sixth electric control valve 153 are connected to the sixth connecting pipe 15, the third flowmeter 152 is electrically connected to the fifth electric control valve 151, and the first liquid level sensor 31 is electrically connected to the sixth electric control valve 153;

[0092] The second distilled water storage tank 16;

[0093] The seventh connecting pipe 17, the seventh connecting pipe 17 is connected between the second distillation furnace and the second distilled water storage tank 16;

[0094] The second condensation device 171, the second condensation device 171 is connected to the seventh connecting pipe 17;

[0095] The second distillation furnace circulation pipe 18, both ends of the second distillation furnace circulation pipe 18 are respectively connected to the second distillation furnace body;

[0096] The second steam heating device 19, the second steam heating device 19 is connected to the second distillation furnace circulation pipe 18;

[0097] The second circulation pump 20, the second circulation pump 20 is connected to the second distillation furnace circulation pipe 18;

[0098] The residue collection kettle 21;

[0099] The eighth connecting pipe 22, one end of the eighth connecting pipe 22 is connected to the second distillation furnace circulation pipe 18, and the other end is connected to the residue collection kettle 21; a seventh electric control valve 221, a fourth flowmeter 222 and an eighth electric control valve 223 are connected to the eighth connecting pipe 22, the fourth flowmeter 222 is electrically connected to the seventh electric control valve 221, and the second liquid level sensor 141 is electrically connected to the eighth electric control valve 223.

[0100] Preferably, a tail gas absorption pipe is connected to a section between the first condensation device 71 of the third connecting pipe 7 and the automatic oil-water separator 6, and the end of the tail gas absorption pipe is connected to a tail gas absorption tower.

[0101] Preferably, in the above continuous production device for 3,5-dichloro-2-pentanone, the pipe diameters of the fifth connecting pipe 11, the sixth connecting pipe 15, the seventh connecting pipe 17 and the eighth connecting pipe 22 are all larger than those of the first connecting pipe 4, the second connecting pipe 5, the third connecting pipe 7 and the fourth connecting pipe 9.

[0102] The present invention also relates to a control method for the above distillation device for the production of 3,5-dichloro-2-pentanone, and the control method includes the following steps:

[0103] Adjust the opening degree of the first electric control valve 41 according to the set first flow rate (700 kg / h), and keep the hydrochloric acid solution in the hydrochloric acid storage tank 1 flowing into the first distillation furnace body 3 at the first flow rate through the first flow meter 42;

[0104] At the same time, adjust the opening degree of the third electric control valve 51 according to the set second flow rate (350 kg / h), and keep the raw material solution in the raw material storage tank 2 flowing into the first distillation furnace body 3 at the second flow rate through the second flow meter 52;

[0105] After the hydrochloric acid and the raw materials in the first distillation furnace body 3 are mixed, they circulate between the first distillation furnace circulation pipe 12 and the first distillation furnace body 3 through the first circulation pump 121, so that the flowing mixed liquid is heated by the first steam heating device 13; the mixed liquid in the first distillation furnace body 3 is heated up, and the generated steam passes through the third connecting pipe 7 and is condensed by the first condensation device 71 to obtain condensate. The condensate enters the automatic oil-water separation device to separate out the 3,5-dichloro-2-pentanone product and the distilled water. The 3,5-dichloro-2-pentanone product is shunted to the 3,5-dichloro-2-pentanone storage tank, and the distilled water is shunted to the distilled water storage tank;

[0106] Adjust the opening degree of the fifth electric control valve 151 according to the preset third flow rate (220 kg / h), and keep the solution in the first distillation furnace circulation pipe 12 flowing into the second distillation furnace body 14 at the third flow rate through the third flow meter 152;

[0107] When the first liquid level sensor 31 senses that the liquid level in the first distillation furnace body 3 is higher than the first threshold value (4000 mm), control the second electric control valve 43 and the fourth electric control valve 53 to close, and the first distillation furnace body 3 stops feeding; when the first liquid level sensor 31 senses that the liquid level in the first distillation furnace body 3 is lower than the second threshold value (1000 mm), control the second electric control valve 43 and the fourth electric control valve 53 to open;

[0108] When the first liquid level sensor 31 senses that the liquid level in the first distillation furnace body 3 is lower than the third threshold value (500 mm), control the sixth electric control valve 153 to close; when the first liquid level sensor 31 senses that the liquid level in the first distillation furnace body 3 is higher than the fourth threshold value (2000 mm), control the sixth electric control valve 153 to open; the third threshold value, the second threshold value, the fourth threshold value, and the first threshold value increase in sequence;

[0109] The solution entering the second distillation furnace body 14 circulates between the second distillation furnace circulation pipe 18 and the second distillation furnace body 14 through the second circulation pump 20, so that the flowing solution is heated by the second steam heating device 19; the solution in the second distillation furnace body 14 is heated up, and the generated steam passes through the seventh connecting pipe 17 and is condensed by the second condensation device 171 to obtain a coolant. The coolant enters the second distilled water storage tank 16;

[0110] Adjust the opening degree of the seventh electric control valve 221 according to the preset fourth flow rate (220 kg / h), and keep the solution in the second distillation furnace circulation pipe 18 at the fourth flow rate and divert it to the residue collection kettle 21 through the fourth flow meter 222;

[0111] When the second liquid level sensor 141 senses that the liquid level in the second distillation furnace body 14 is higher than the fifth threshold value (4000 mm), control the sixth electric control valve 153 to close. When the second liquid level sensor 141 senses that the liquid level in the second distillation furnace body 14 is lower than the sixth threshold value (1000 mm), control the sixth electric control valve 153 to open;

[0112] When the second liquid level sensor 141 senses that the liquid level in the second distillation furnace body 14 is lower than the seventh threshold value (500 mm), control the eighth electric control valve 223 to close; when the second liquid level sensor 141 senses that the liquid level in the second distillation furnace body 14 is higher than the eighth threshold value (2000 mm), control the eighth electric control valve 223 to open; the seventh threshold value, the sixth threshold value, the eighth threshold value, and the fifth threshold value increase in sequence.

[0113] Based on the original distillation furnace, this application adopts a specific pipeline connection method, combined with the corresponding connection positions of electric control valves and flow control and liquid level control mechanisms, to achieve continuous feeding in the production process of 3,5-dichloro-2-pentanone products. Compared with traditional intermittent feeding, it omits the processes of heating and cooling, improves the utilization rate of equipment, increases production capacity; reduces the manual operation cost; compared with the existing tubular microchannel continuous flow reactor, due to the addition of a sixth connecting pipe for quantitative diversion connected to the second distillation furnace body beside the first distillation furnace circulation pipe bypass, the dilute solution in the first distillation furnace body is continuously diverted to the second distillation furnace for additional distillation reaction, solving the problem that by-products are easily generated in the steam pipeline after the solution is distilled and diluted in the original intermittent feeding, and also ensuring that there is sufficient 3,5-dichloro-2-pentanone oil phase in the steam continuously generated in the first distillation furnace body, and a good-quality 3,5-dichloro-2-pentanone product can be obtained through the automatic oil-water separator normally. The solution quantitatively fed into the second distillation furnace has a reduced concentration of 3,5-dichloro-2-pentanone oil phase in the steam due to the previous distillation reaction and is prone to side reaction products such as tar, etc., but it can ensure that no side reactions occur in the pipeline connecting the first distillation furnace for the main reaction, avoiding the reduction of the aperture or blockage of the pipeline connecting the first distillation furnace and affecting the reaction continuity and product quality; since the by-products are concentrated in the pipeline connected to the second distillation furnace, it is convenient for subsequent positioning and cleaning, reducing the cleaning difficulty of by-products.

[0114] Furthermore, this application also increases the pipe diameter of the pipeline connected to the second distillation furnace to avoid blockage of the corresponding pipeline due to by-products generated during the distillation process of the second distillation furnace.

[0115] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A distillation apparatus for the production of 3,5-dichloro-2-pentanone, characterized in that, Including: Hydrochloric acid storage tank; Raw material storage tank; The first distillation furnace body, and a first liquid level sensor is connected inside the first distillation furnace body; The first connecting pipe, the first connecting pipe is connected between the hydrochloric acid storage tank and the first distillation furnace body, the first connecting pipe is connected with a first electric control valve and a first flow meter, and the first flow meter and the first electric control valve are electrically connected; the first connecting pipe is connected with a second electric control valve, and the second electric control valve is electrically connected with the first liquid level sensor; The second connecting pipe, the second connecting pipe is connected between the raw material storage tank and the first distillation furnace body, the first connecting pipe is connected with a third electric control valve and a second flow meter, and the second flow meter and the third electric control valve are electrically connected; the second connecting pipe is connected with a fourth electric control valve, and the fourth electric control valve is electrically connected with the first liquid level sensor; Automatic oil-water separator; The third connecting pipe, the third connecting pipe is connected between the first distillation furnace body and the automatic oil-water separator; The first condensation device, the first condensation device is connected to the third connecting pipe; Oil product storage tank; The fourth connecting pipe, the fourth connecting pipe is connected between the automatic oil-water separator and the oil product storage tank; The first distilled water storage tank; The fifth connecting pipe, the fifth connecting pipe is connected between the automatic oil-water separator and the first distilled water storage tank; The first distillation furnace circulation pipe, and both ends of the first distillation furnace circulation pipe are respectively connected to the first distillation furnace body; The first circulation pump, the first circulation pump is connected to the first distillation furnace circulation pipe; The first steam heating device, the first steam heating device is connected to the first distillation furnace circulation pipe; The second distillation furnace body, and a second liquid level sensor is arranged inside the second distillation furnace body; The sixth connecting pipe, one end of the sixth connecting pipe is connected to the first distillation furnace circulation pipe, and the other end is connected to the second distillation furnace body; the sixth connecting pipe is connected with a fifth electric control valve, a third flow meter and a sixth electric control valve, the third flow meter and the fifth electric control valve are electrically connected, and the first liquid level sensor and the sixth electric control valve are electrically connected; The second distilled water storage tank; The seventh connecting pipe, the seventh connecting pipe is connected between the second distillation furnace and the second distilled water storage tank; The second condensation device, the second condensation device is connected to the seventh connecting pipe; The second distillation furnace circulation pipe, and both ends of the second distillation furnace circulation pipe are respectively connected to the second distillation furnace body; The second steam heating device, the second steam heating device is connected to the second distillation furnace circulation pipe; The second circulation pump, the second circulation pump is connected to the second distillation furnace circulation pipe; Residue collection kettle; The eighth connecting pipe, one end of the eighth connecting pipe is connected to the second distillation furnace circulation pipe, and the other end is connected to the residue collection kettle; the eighth connecting pipe is connected with a seventh electric control valve, a fourth flow meter and an eighth electric control valve, the fourth flow meter and the seventh electric control valve are electrically connected, and the second liquid level sensor and the eighth electric control valve are electrically connected.

2. The distillation apparatus for the production of 3,5-dichloro-2-pentanone according to claim 1, characterized in that, A section between the first condensation device of the third connecting pipe and the automatic oil-water separator is connected with a tail gas absorption pipe, and the end of the tail gas absorption pipe is connected to the tail gas absorption tower.

3. The distillation apparatus for the production of 3,5-dichloro-2-pentanone according to claim 1, characterized in that, The diameters of the fifth connecting pipe, the sixth connecting pipe, the seventh connecting pipe and the eighth connecting pipe are all larger than those of the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe.

4. Control method for a distillation device used in the production of 3,5-dichloro-2-pentanone, characterized in that, For the distillation apparatus for the production of 3,5-dichloro-2-pentanone according to any one of claims 1 to 3, the control method comprises the following steps: Adjust the opening degree of the first electric control valve according to the set first flow rate, and keep the hydrochloric acid solution in the hydrochloric acid storage tank flowing into the first distillation furnace body at the first flow rate through the first flow meter; Meanwhile, adjust the opening degree of the third electric control valve according to the set second flow rate, and keep the raw material solution in the raw material storage tank flowing into the first distillation furnace body at the second flow rate through the second flow meter; After the hydrochloric acid and the raw materials in the first distillation furnace body are mixed, they circulate between the first distillation furnace circulation pipe and the first distillation furnace body through the first circulation pump, and the mixed liquid in the flow is heated by the first steam heating device; the mixed liquid in the first distillation furnace body is heated up, and the generated steam passes through the third connecting pipe and is condensed by the first condensing device to obtain condensate. The condensate enters the automatic oil-water separation device to separate out the 3,5-dichloro-2-pentanone product and the distilled water. The 3,5-dichloro-2-pentanone product is shunted to the 3,5-dichloro-2-pentanone storage tank, and the distilled water is shunted to the distilled water storage tank; Adjust the opening degree of the fifth electric control valve according to the preset third flow rate, and keep the solution in the first distillation furnace circulation pipe flowing into the second distillation furnace body at the third flow rate through the third flow meter; When the first liquid level sensor senses that the liquid level in the first distillation furnace body is higher than the first threshold value, control the second electric control valve and the fourth electric control valve to close, and stop feeding the first distillation furnace body; when the first liquid level sensor senses that the liquid level in the first distillation furnace body is lower than the second threshold value, control the second electric control valve and the fourth electric control valve to open; When the first liquid level sensor senses that the liquid level in the first distillation furnace body is lower than the third threshold value, control the sixth electric control valve to close; when the first liquid level sensor senses that the liquid level in the first distillation furnace body is higher than the fourth threshold value, control the sixth electric control valve to open; the third threshold value, the second threshold value, the fourth threshold value, and the first threshold value increase in sequence; The solution entering the second distillation furnace body circulates between the second distillation furnace circulation pipe and the second distillation furnace body through the second circulation pump, and the solution in the flow is heated by the second steam heating device; the solution in the second distillation furnace body is heated up, and the generated steam passes through the seventh connecting pipe and is condensed by the second condensing device to obtain a coolant, and the coolant enters the second distilled water storage tank; Adjust the opening degree of the seventh electric control valve according to the preset fourth flow rate, and keep the solution in the second distillation furnace circulation pipe flowing into the residue collection kettle at the fourth flow rate through the fourth flow meter; When the second liquid level sensor senses that the liquid level in the second distillation furnace body is higher than the fifth threshold value, control the sixth electric control valve to close, and when the second liquid level sensor senses that the liquid level in the second distillation furnace body is lower than the sixth threshold value, control the sixth electric control valve to open; When the second liquid level sensor senses that the liquid level in the second distillation furnace body is lower than the seventh threshold value, control the eighth electric control valve to close; when the second liquid level sensor senses that the liquid level in the second distillation furnace body is higher than the eighth threshold value, control the eighth electric control valve to open; the seventh threshold value, the sixth threshold value, the eighth threshold value, and the fifth threshold value increase in sequence.

5. The control method of the distillation device for the production of 3,5-dichloro-2-pentanone according to claim 4, characterized in that, The ratio of the first flow rate to the second flow rate is 2:

1.

6. The control method of the distillation device for the production of 3,5-dichloro-2-pentanone according to claim 4, characterized in that, The ratio of the first flow rate to the third flow rate is 3 - 4:

1.

7. The control method of the distillation device for the production of 3,5-dichloro-2-pentanone according to claim 4, characterized in that, The ratio of the first flow rate to the fourth flow rate is 3 - 4:1.

Images