A system for removing impurities from decabromodiphenylethane to reduce metal ions
By designing a decompression system including a bromine evaporation kettle, a centrifuge and a disodium EDTA feed silo, the problem of metal ion residue in decabromodiphenylethane is solved, and an efficient and economical metal ion removal effect is achieved.
Patent Information
- Application Number
- CN202421449362.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-24
AI Technical Summary
In the existing decabromodiphenylethane production process, it is difficult to completely remove metal ions in the catalyst, resulting in metal ions residues in the product, affecting the whiteness and quality of the product.
A decomposition system was designed, including a bromine evaporation kettle, centrifuge, disodium EDTA feeding silo and neutralization kettle. Through repeated neutralization washing and centrifugal separation processes, a stable complex was used to form a metal ions with disodium EDTA and gradually remove metal ions.
It effectively reduces the content of metal ions in decabromodiphenylethane, improves the aging of metal ions and reduces the removal cost, and takes into account the impurity removal efficiency and cost of industrial production.
Smart Images
Figure CN222709655U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a chemical production impurity removal system, in particular to an impurity removal system for reducing metal ions in decabromodiphenylethane. Background Art
[0002] Decabromodiphenyl ethane product (DBDPE) is a new type of high-efficiency brominated flame retardant with excellent thermal stability and extremely high bromine content. It is almost insoluble in all solvents. It does not produce toxic polybrominated dibenzodioxane (DBDO) and polybrominated dibenzofuran (DBDF) during thermal decomposition or combustion, and does not cause harm to the environment. It is widely used in styrene polymers, engineering thermoplastics, wires, cable coatings and insulation materials, elastomers and thermosetting plastics.
[0003] The existing production process of decabromodiphenylethane generally adopts the excess bromine method, that is, diphenylethane and excess bromine react under the action of a catalyst to obtain decabromodiphenylethane. In order to promote the bromination reaction, Lewis acid can be used as a catalyst, and Lewis acid can polarize bromine molecules to form a strong electrophilic reagent, so the catalyst generally uses aluminum chloride, ferric chloride, aluminum tribromide, ferric tribromide, etc. Inevitably, the metal ions in the catalyst will be transferred to the decabromodiphenylethane product, thereby reducing the whiteness of the product or bringing other adverse effects. In the production process, the amount of catalyst can usually be reduced by purifying the raw materials and reducing the consumption of the catalyst by the water in the raw materials, so as to reduce the content of metal ions in the product. However, this method only treats the symptoms and not the root cause. The catalyst is indispensable in the bromination reaction of diphenylethane, and there will still be a small amount of metal ions remaining in the decabromodiphenylethane product. Summary of the invention
[0004] The utility model provides an impurity removal system for reducing metal ions in decabromodiphenylethane which has a simple structure and can effectively take into account the industrial production impurity removal efficiency, cost and effect.
[0005] The technical scheme adopted by the utility model is: an impurity removal system for reducing metal ions in decabromodiphenylethane, comprising a bromine evaporation kettle, a centrifuge and a disodium EDTA feeding bin, the bromine evaporation kettle is connected to the centrifuge via a bottom valve, and is characterized in that: it also comprises a deionized water storage tank, a deionized water three-way valve, a batching kettle, a sodium carbonate feeding bin, a neutralization kettle, a neutralization material three-way valve and a material pump, the deionized water storage tank is connected to the deionized three-way valve, the deionized three-way valve is respectively connected to the batching kettle and the neutralization kettle, the disodium EDTA feeding bin and the sodium carbonate feeding bin are respectively connected to the batching kettle, the batching kettle discharge is connected to the neutralization kettle, the centrifuge material is connected to the neutralization kettle, the bottom of the neutralization kettle is connected to the neutralization material three-way valve, the neutralization material three-way valve is respectively connected to the sand mill device and the material pump, and the material pump pumps the centrifuge feed.
[0006] The batching kettle and the neutralization kettle are provided with stirrers.
[0007] The pipeline connecting the material discharge of the batching kettle to the neutralization kettle is connected to the pipeline of the neutralization kettle by using a deionized three-way valve.
[0008] A one-way valve is arranged on the pipeline connecting the deionization three-way valve to the neutralization kettle before the pipeline connecting to the batching kettle.
[0009] The centrifuge wastewater is connected to a wastewater tank.
[0010] The disodium EDTA feeding bin and the sodium carbonate feeding bin are respectively connected to the batching kettle via feeding valves.
[0011] The beneficial effects of the utility model are as follows: after the material containing metal ions in the bromine distillation kettle is separated by a centrifuge, part of the metal ions are discharged with waste water, disodium EDTA is added in the neutralization kettle process, and after repeated neutralization, washing and centrifugal separation processes, the usage of disodium EDTA can be reduced, and stable complexes are formed with most metal ions other than alkali metals to eliminate metal ions, while the time efficiency of removing metal ions is improved and the removal cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the structure of the utility model.
[0013] In the figure: bromine distillation kettle 1, centrifuge 2, neutralization kettle 3, deionized water storage tank 4, batching kettle 5, sodium carbonate feeding bin 6, disodium EDTA feeding bin 7, material pump 8, deionized water three-way valve 9, neutralization material three-way valve 10. DETAILED DESCRIPTION
[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0015] Figure 1 As shown, a decontamination system for reducing metal ions in decabromodiphenylethane includes a bromine evaporation kettle 1, a centrifuge 2, a neutralization kettle 3, a deionized water storage tank 4, a batching kettle 5, a sodium carbonate feeding bin 6, a disodium EDTA feeding bin 7, a material pump 8, a deionized water three-way valve 9, and a neutralization material three-way valve 10.
[0016] The bromine distillation kettle 1 is connected to the centrifuge 2 through the bottom valve, and the material of the centrifuge 2 is sent to the neutralization kettle 3. The bottom of the neutralization kettle 3 is connected to the neutralization material three-way valve 10, and the neutralization material three-way valve 10 is respectively connected to the sand mill and the material pump 8, and the material pump 8 pumps the centrifuge 2 to feed; the neutralization kettle 3 is also connected to a deionized water storage tank 4 and a batching kettle 5, the deionized water storage tank 4 is connected to a deionized three-way valve 9, and the deionized three-way valve 9 is respectively connected to the batching kettle 5 and the neutralization kettle 3, the EDTA disodium feeding bin 7 and the sodium carbonate feeding bin 6 are respectively connected to the batching kettle 5 through the feeding valve, and the discharge of the batching kettle 5 is connected to the neutralization kettle 3. In this embodiment, the pipeline of the batching kettle discharge connected to the neutralization kettle borrows the pipeline of the deionized three-way valve connected to the neutralization kettle, and the pipeline of the deionized three-way valve connected to the neutralization kettle is provided with a one-way valve on the pipeline before the batching kettle is connected.
[0017] In this embodiment, the bromine distillation kettle, the batching kettle and the neutralization kettle are all equipped with a stirrer. The waste water of the centrifuge 2 is connected to the waste water tank, and the sand milling device is a sand milling process, which is a prior art.
[0018] The impurity removal process of this embodiment: after the bromine distillation is completed, the material in the bromine distillation kettle 1 enters the centrifuge 2 through the bottom valve for solid-liquid separation, the solid wet material enters the neutralization kettle 3, and the wastewater flows to the wastewater pool. The deionized water in the deionized water storage tank 4 enters the batching kettle 5 through the deionized water three-way valve 9, the batching kettle 5 is opened for stirring, and sodium carbonate enters the batching kettle through the sodium carbonate feeding bin 6. After dissolution, the sodium carbonate aqueous solution enters the neutralization kettle 3 through the bottom valve of the batching kettle 5. The neutralization kettle 3 is opened for stirring and washing of decabromodiphenylethane. After washing, the material is pumped into the centrifuge 2 through the material pump 8 from the neutralization material three-way valve 10. After solid-liquid separation, the solid wet material enters the neutralization kettle 3. Deionized water is added to the batching kettle 5 again, stirring is started, and disodium EDTA is added through the disodium EDTA feeding bin 7. After dissolution, the disodium EDTA aqueous solution enters the neutralization kettle 3. After stirring and washing, the material enters the centrifuge 2 again for solid-liquid separation, and the solid wet material enters the neutralization kettle 3. Deionized water enters the neutralization kettle 3 through the deionized water three-way valve 9. After stirring and washing, the solid-liquid mixture is centrifugally washed again and then enters the sand grinding process through the neutralization material three-way valve 10.
Claims
1. A system for removing impurities from decabromodiphenylethane, comprising a bromine evaporator, a centrifuge and a disodium EDTA feeding bin, wherein the bromine evaporator is connected to the centrifuge via a bottom valve, and is characterized in that: It also includes a deionized water storage tank, a deionized water three-way valve, a batching kettle, a sodium carbonate feeding bin, a neutralization kettle, a neutralization material three-way valve and a material pump. The deionized water storage tank is connected to the deionized three-way valve, the deionized three-way valve is respectively connected to the batching kettle and the neutralization kettle, the disodium EDTA feeding bin and the sodium carbonate feeding bin are respectively connected to the batching kettle, the discharge of the batching kettle is connected to the neutralization kettle, the centrifuge material is connected to the neutralization kettle, the bottom of the neutralization kettle is connected to the neutralization material three-way valve, the neutralization material three-way valve is respectively connected to the sand mill device and the material pump, and the material pump pumps the centrifuge feed.
2. The impurity removal system for reducing metal ions in decabromodiphenylethane according to claim 1, characterized in that: The batching kettle and the neutralization kettle are provided with stirrers.
3. The impurity removal system for reducing metal ions in decabromodiphenylethane according to claim 1, characterized in that: The pipeline connecting the material discharge of the batching kettle to the neutralization kettle is connected to the pipeline of the neutralization kettle by using a deionized three-way valve.
4. The impurity removal system for reducing metal ions in decabromodiphenylethane according to claim 3, characterized in that: A one-way valve is arranged on the pipeline connecting the deionization three-way valve to the neutralization kettle before the pipeline connecting to the batching kettle.
5. The impurity removal system for reducing metal ions in decabromodiphenylethane according to claim 1, characterized in that: The centrifuge wastewater is connected to a wastewater tank.
6. The impurity removal system for reducing metal ions in decabromodiphenylethane according to claim 1, characterized in that: The disodium EDTA feeding bin and the sodium carbonate feeding bin are respectively connected to the batching kettle via feeding valves.