An apparatus for reducing propylene oxide feedstock consumption and reducing solid residue

Abstract

The utility model relates to a device for reducing propylene oxide raw material consumption and reducing solid slag. Its technical scheme is: the outlet of saponification reaction tank is connected to the sedimentation tank through the pipeline, the upside of the sedimentation tank is connected to the preparation tank through the reflux pipeline, the lower part of the sedimentation tank is connected to the pickling mixer through the first road pipeline and the first slurry pump, the upper part of the pickling mixer is connected to the chlorohydrin reaction tank through the pipeline, and the discharge port of the pickling mixer is connected to the propylene oxide high-temperature tank through the pipeline. Its beneficial effect is: the utility model concentrates saponification residual liquid multiple times through the sedimentation tank, recovers residual liquid, and the residual liquid part enters the lime milk preparation process, and part enters the reaction consumption hydrochloric acid in chloropropanol solution before saponification, finally realizes the purpose of reducing calcium hydroxide consumption and reducing filter press solid slag.

Description

Technical Field

[0001] This utility model relates to the field of propylene oxide preparation technology, and in particular to a device for reducing propylene oxide raw material consumption and reducing solid residue. Background Technology

[0002] In recent years, with the booming development of new energy vehicles and the energy storage industry, the demand for ethylene carbonate, an indispensable electrolyte solvent for lithium batteries, has also been increasing. Ethylene carbonate can be prepared via transesterification, and propylene oxide is a major raw material for the production of dimethyl carbonate through this process. Propylene oxide production uses calcium hydroxide in a 1.2:1 ratio with chloropropanol, resulting in a large amount of calcium hydroxide in the final saponified water. Calcium hydroxide emulsion is prepared from lime, which is produced by burning limestone. This emulsion contains substances such as Ca(OH)₂, CaCO₃, Mg(OH)₂, MgCO₃, Fe₂O₃, Al₂O₃, and SiO₂. Therefore, the preparation process involves high calcium hydroxide consumption and the formation of solid slag. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a device that reduces the consumption of propylene oxide raw materials and reduces solid residue. The device involves multiple concentrations of saponification residue in a settling tank, recycling the residue, and partially feeding it into the lime slurry preparation process, while a portion of the residue is fed into the hydrochloric acid solution in the pre-saponification reaction to consume chloropropanol. Ultimately, this achieves the goal of reducing calcium hydroxide consumption and decreasing filter press solid residue.

[0004] The present invention discloses a device for reducing the consumption of propylene oxide raw materials and reducing solid residue. The technical solution is as follows: it includes a saponification reaction tank (1), a settling tank (2), an acid washing mixer (3), a first slurry pump (4), an emulsification tank (6), a propylene oxide high-temperature tank (7), a chlorohydrin reaction tank (8), and a slurry temporary storage tank (9). The outlet of the saponification reaction tank (1) is connected to the settling tank (2) through a pipeline. The upper side of the settling tank (2) is connected to the emulsification tank (6) through a return pipeline (10). The lower part of the settling tank (2) is connected to the acid washing mixer (3) through a first pipeline (12) and the first slurry pump (4). The upper part of the acid washing mixer (3) is connected to the chlorohydrin reaction tank (8) through a pipeline. The outlet of the acid washing mixer (3) is connected to the propylene oxide high-temperature tank (7) through a pipeline.

[0005] Preferably, the lower part of the settling tank (2) is connected to the slurry storage tank (9) via a second pipeline (14) and a second slurry pump (5).

[0006] Preferably, the lower part of the sedimentation tank (2) is connected to the main pipeline (11), the outer end of the main pipeline (11) is connected to the first pipeline (12) and the second pipeline (14), a first slurry control valve (13) is installed on the first pipeline (12), and a second slurry control valve (15) is installed on the second pipeline (14).

[0007] Preferably, a third control valve (4.1) and a fourth control valve (4.2) are installed on the pipeline connected to the output end of the first slurry pump (4), and a fifth control valve (5.1) and a sixth control valve (5.2) are installed on the pipeline connected to the output end of the second slurry control valve (15).

[0008] Preferably, a connecting pipe (5.3) is provided on the pipeline between the output end of the first slurry pump (4) and the output end of the second slurry control valve (15).

[0009] Preferably, a seventh control valve (5.4) is provided on the pipeline between the above-mentioned connecting pipe (5.3) and the slurry temporary storage tank (9).

[0010] The beneficial effects of this utility model are as follows: This utility model connects the supernatant in the sedimentation tank to the milk-making tank through a return pipeline, and continues to make full use of calcium hydroxide to produce lime milk solution, recycling the effective components in the saponification liquid; then the sludge settled at the bottom of the sedimentation tank is pumped into the acid washing mixer through the connected first slurry pump, neutralized with chloropropanol and acid from the chlorohydrin reaction tank, and then sent to the propylene oxide high-temperature tank for sedimentation; in addition, the sludge settled at the bottom of the sedimentation tank can also be pumped into the slurry temporary storage tank through the connected second slurry pump; This invention uses a sedimentation tank to repeatedly concentrate saponification residue, recover the residue, and part of the residue enters the lime milk preparation process, while part enters the hydrochloric acid in the chloropropanol solution before saponification, ultimately achieving the purpose of reducing calcium hydroxide consumption and reducing filter press solids. Attached Figure Description

[0011] Figure 1 This is a connection diagram of Embodiment 1 of this utility model; Figure 2 This is a connection diagram of Embodiment 2 of this utility model; In the diagram above: Saponification reaction tank 1, settling tank 2, acid washing mixer 3, first slurry pump 4, second slurry pump 5, emulsification tank 6, propylene oxide high-temperature tank 7, chlorohydrin reaction tank 8, slurry temporary storage tank 9, return pipeline 10, main pipeline 11, first pipeline 12, first slurry control valve 13, second pipeline 14, second slurry control valve 15, third control valve 4.1, fourth control valve 4.2, fifth control valve 5.1, sixth control valve 5.2, connecting pipe 5.3, seventh control valve 5.4. Detailed Implementation

[0012] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0013] Example 1, referring to Figure 1 The present invention discloses a device for reducing propylene oxide raw material consumption and solid residue, comprising a saponification reaction tank 1, a settling tank 2, an acid washing mixer 3, a first slurry pump 4, an emulsification tank 6, a high-temperature propylene oxide tank 7, a chlorohydrin reaction tank 8, and a slurry temporary storage tank 9. The outlet of the saponification reaction tank 1 is connected to the settling tank 2 via a pipeline. The upper side of the settling tank 2 is connected to the emulsification tank 6 via a return pipeline 10. The lower part of the settling tank 2 is connected to the acid washing mixer 3 via a first pipeline 12 and the first slurry pump 4. The upper part of the acid washing mixer 3 is connected to the chlorohydrin reaction tank 8 via a pipeline. The outlet of the acid washing mixer 3 is connected to the high-temperature propylene oxide tank 7 via a pipeline.

[0014] The lower part of the aforementioned settling tank 2 is connected to the slurry temporary storage tank 9 via the second pipeline 14 and the second slurry pump 5.

[0015] The lower part of the sedimentation tank 2 is connected to the main pipeline 11. The outer end of the main pipeline 11 is connected to the first pipeline 12 and the second pipeline 14 in parallel. The first slurry control valve 13 is installed on the first pipeline 12, and the second slurry control valve 15 is installed on the second pipeline 14.

[0016] The third control valve 4.1 and the fourth control valve 4.2 are installed on the pipeline connected to the output end of the first slurry pump 4, and the fifth control valve 5.1 and the sixth control valve 5.2 are installed on the pipeline connected to the output end of the second slurry control valve 15.

[0017] In use, the saponification residue in the saponification reaction tank 1 is redirected from the pipeline that was sent to the high-temperature pool to the settling tank 2. The supernatant in the settling tank 2 is connected to the emulsion tank 6 through the return pipeline 10 to continue to make full use of calcium hydroxide to produce lime milk solution and recycle the effective components in the saponification liquid. The sludge settled at the bottom of the settling tank 2 is then pumped into the acid washing mixer 3 through the connected first slurry pump 4, where it is neutralized with chloropropanol and acid from the chlorohydrin reaction tank 8, and then sent to the propylene oxide high-temperature tank 7 for settling. In addition, the sludge settled at the bottom of the settling tank 2 can also be pumped into the slurry temporary storage tank 9 through the connected second slurry pump 5.

[0018] This invention uses a sedimentation tank to repeatedly concentrate saponification residue, recover the residue, and part of the residue enters the lime milk preparation process, while part enters the hydrochloric acid in the chloropropanol solution before saponification, ultimately achieving the purpose of reducing calcium hydroxide consumption and reducing filter press solids.

[0019] Example 2: The device for reducing propylene oxide raw material consumption and solid residue mentioned in this utility model includes a saponification reaction tank 1, a settling tank 2, an acid washing mixer 3, a first slurry pump 4, an emulsification tank 6, a high-temperature propylene oxide tank 7, a chlorohydrin reaction tank 8, and a slurry temporary storage tank 9. The outlet of the saponification reaction tank 1 is connected to the settling tank 2 via a pipeline. The upper side of the settling tank 2 is connected to the emulsification tank 6 via a return pipeline 10. The lower part of the settling tank 2 is connected to the acid washing mixer 3 via a first pipeline 12 and the first slurry pump 4. The upper part of the acid washing mixer 3 is connected to the chlorohydrin reaction tank 8 via a pipeline. The outlet of the acid washing mixer 3 is connected to the high-temperature propylene oxide tank 7 via a pipeline.

[0020] The difference from Example 1 is: Reference Figure 2 In this embodiment, a connecting pipe 5.3 is provided on the pipeline between the output end of the first slurry pump 4 and the output end of the second slurry control valve 15. In addition, a seventh control valve 5.4 is provided on the pipeline between the connecting pipe 5.3 and the slurry temporary storage tank 9. By opening the fifth control valve 5.1, the sixth control valve 5.2 and the fourth control valve 4.2, and closing the seventh control valve 5.4 and the third control valve 4.1, the second slurry control valve 15 is connected to the pickling mixer 3, so that the above-mentioned functions can still be achieved when the first slurry pump 4 stops.

[0021] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. An apparatus for reducing propylene oxide feedstock consumption and reducing solids, characterized by: The system includes a saponification reaction tank (1), a settling tank (2), an acid washing mixer (3), a first slurry pump (4), an emulsification tank (6), a propylene oxide high-temperature tank (7), a chlorohydrin reaction tank (8), and a slurry temporary storage tank (9). The outlet of the saponification reaction tank (1) is connected to the settling tank (2) via a pipeline. The upper side of the settling tank (2) is connected to the emulsification tank (6) via a return pipeline (10). The lower part of the settling tank (2) is connected to the acid washing mixer (3) via a first pipeline (12) and the first slurry pump (4). The upper part of the acid washing mixer (3) is connected to the chlorohydrin reaction tank (8) via a pipeline. The outlet of the acid washing mixer (3) is connected to the propylene oxide high-temperature tank (7) via a pipeline.

2. The apparatus for reducing propylene oxide feedstock consumption and solid slag reduction according to claim 1, characterized in that: The lower part of the settling tank (2) is connected to the slurry storage tank (9) via a second pipeline (14) and a second slurry pump (5).

3. A device for reducing propylene oxide feedstock consumption and reducing solid residue according to claim 2, characterized in that: The lower part of the sedimentation tank (2) is connected to the main pipeline (11), and the outer end of the main pipeline (11) is connected to the first pipeline (12) and the second pipeline (14). A first slurry control valve (13) is installed on the first pipeline (12), and a second slurry control valve (15) is installed on the second pipeline (14).

4. The apparatus of claim 3, wherein the apparatus is characterized by: The third control valve (4.1) and the fourth control valve (4.2) are installed on the pipeline connected to the output end of the first slurry pump (4), and the fifth control valve (5.1) and the sixth control valve (5.2) are installed on the pipeline connected to the output end of the second slurry control valve (15).

5. A device for reducing propylene oxide feedstock consumption and reducing solid residue according to claim 4, characterized in that: A connecting pipe (5.3) is provided on the pipeline between the output end of the first slurry pump (4) and the output end of the second slurry control valve (15).

6. A device for reducing propylene oxide feedstock consumption and reducing solid residue according to claim 5, characterized in that: A seventh control valve (5.4) is provided on the pipeline between the connecting pipe (5.3) and the slurry temporary storage tank (9).

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