Silicone slurry residue treatment system and treatment technology thereof

A processing system and organosilicon technology, applied in the direction of organic chemistry, process efficiency improvement, inorganic chemistry, etc., can solve the problems of secondary pollution, effective resources, waste, etc., and achieve the effect of saving investment, improving utilization efficiency, and mild operating conditions

Inactive Publication Date: 2019-06-18
TIANJIN UNIV +1
12 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0008] Aiming at technical problems such as secondary pollution and waste of effective resources in the existing organic silicon pulp and slag treatment process, the present invention discloses an effective organic silicon pulp an...
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Method used

The outlet of mixing tank 3 is connected with the inlet of azeotropic evaporator 4, after organosilicon pulp slag and azeotropic solvent are mixed, heat is carried out in azeotropic evaporator 4, the silane material and solvent in slurry slag are azeotroped together evaporation. The azeotropic evaporator 4 uses a batch reactor or a continuous reactor, with a stirring paddle inside and a heating device outsi...
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Abstract

The invention belongs to the technical field of waste treatment, and discloses a silicone slurry residue treatment system and a treatment technology thereof. The inlet of an azeotropic evaporation kettle device is connected with a mixing tank for mixing a silicone slurry residue source and an azeotropic solvent, a silane substance in the slurry residue is azeotropically evaporated together with the solvent, the obtained evaporated product enters an evaporated product rectification tower, a silicone high-boiling liquid phase monomer product is obtained from the bottom of the tower, and is sentinto a high-boiling cracking device to recover effective components, and an azeotropic solvent obtained from the top of the tower can be reused; and a residual liquid in the azeotropic evaporation kettle device, is filtered and dried, and then enters a waste powder deactivation device to extract and recover valuable components such as copper and silicon. The silicone slurry residue which is difficult to treat is evaporated and rectified to recover the valuable monomers and produce high-boiling methylchlorosilane, so the useful high-boiling methylchlorosilane in the slurry residue is recycled,the reduction treatment of the silicone slurry residue is achieved, the production cost is greatly reduced, and good economic benefits are obtained.

Application Domain

Group 4/14 element organic compoundsProcess efficiency improvement +1

Technology Topic

SolventChemistry +17

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  • Silicone slurry residue treatment system and treatment technology thereof

Examples

  • Experimental program(1)

Example Embodiment

[0034] The present invention will be further described in detail below through specific embodiments. The following embodiments may enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention in any way.
[0035] Such as figure 1 As shown, this embodiment discloses for the first time an organic silicon slurry treatment system integrating evaporation, rectification, cracking and other processes, which mainly includes slurry tank 1, azeotropic solvent tank 2, mixing tank 3, azeotropic evaporation kettle 4. Product distillation tower 12, high boiling cracking device 13, residue filter 5, solid drying tower 6, waste powder deactivation device 8.
[0036] The silicone slurry tank 1 and the azeotropic solvent tank 2 are respectively connected to the two inlets of the mixing tank 3. The mixing tank 3 is used to store the silicone slurry raw materials and the azeotropic solvent, and is also used to stir the silicone slurry. Make it thoroughly mixed with the azeotropic solvent. The azeotropic solvent is monochloromethane, dichloromethane, trichloromethane, tetrachloroethane, etc.
[0037] The outlet of the mixing tank 3 is connected with the inlet of the azeotropic evaporation tank 4, and after the organic silicon slurry residue and the azeotropic solvent are mixed, heating is carried out in the azeotropic evaporation tank 4, so that the silane substance in the slurry residue and the solvent are azeotropically evaporated. The azeotropic evaporation kettle 4 uses a batch reaction kettle or a continuous reaction kettle with a stirring paddle inside and a heating device outside. The silicone slurry residue and azeotropic solvent can be fully contacted and dissolved under the action of heating and stirring. Make the slurry temperature more uniform and improve the evaporation efficiency. The heating method of the azeotropic evaporation kettle 4 can be electric heating, hot water heating, heat transfer oil circulating heating, far infrared heating, inner/outer coil heating, etc.
[0038] The azeotropic evaporation kettle 4 is equipped with a temperature indicating control system. When the real-time temperature in the kettle is lower than the set temperature, heating is performed; when the real-time temperature in the kettle is equal to or higher than the set temperature, the heating is stopped. The azeotropic evaporation kettle 4 is equipped with a liquid level indicating control system, and when the liquid level of the azeotrope in the kettle is lower than the set value, the evaporation is stopped.
[0039] The material outlet of the azeotropic evaporation kettle 4 is connected to the feed inlet of the steamed product rectification tower 12 through the first pump device 9. The steamed product rectification tower 12 adopts a plate tower, and the plate tower adopts a sieve tray or a valve tower. Plate; the top of the tower is equipped with a condenser, and the bottom of the tower is equipped with a reboiler. The top outlet of the rectification tower 12 for distilled products is connected to the azeotropic solvent tank 2, and the solvent produced at the top of the tower is condensed and returned to the azeotropic solvent tank 2, so that the azeotropic solvent can be recycled. Part of the solvent in the azeotropic solvent tank 2 is refluxed to the top of the distillation tower through the second pump device 10. The bottom outlet of the distillation tower 12 for distilled products is connected to the high boiling cracking device 13 through the third pump device 11, so that the organic silicon monomer produced at the bottom of the tower enters the high boiling cracking device 13. The high-boiling cracking device 13 performs high-boiling cracking on the organosilicon high-boiling monomer produced by the rectification tower 12 that is steamed out, recovers effective components, and produces high-boiling methylchlorosilane.
[0040] The outlet of the residue of the azeotropic evaporation kettle 4 is connected to the inlet of the residue filter 5, and the outlet of the residue filter 5 is connected to the inlet of the solid drying tower 6. The residue filter 5 performs residue filtration on the residue of the azeotropic evaporation tank 4. The solid drying tower 6 dries the solid powder after the residual liquid is filtered, and is equipped with a dedicated blower 7 for drying equipment; the solid drying method adopts atmospheric drying, nitrogen replacement drying, or vacuum drying.
[0041] The outlet of the solid drying tower 6 is connected to the inlet of the waste powder deactivation device 8. The waste powder deactivation device 8 recovers organic silicon waste powder and extracts valuable copper, silicon and other components.
[0042] Based on the treatment process of the above-mentioned organosilicon slurry treatment system, proceed as follows:
[0043] (1) After the organosilicon slurry residue and the azeotropic solvent are mixed, they are heated in the azeotropic evaporation tank 4, so that the silane substance in the slurry residue and the solvent are azeotropically evaporated, and the evaporated product obtained by the azeotropic evaporation tank 4 enters and is evaporated Product distillation tower 12;
[0044] (2) Distillation and separation of the evaporating product from the product distillation tower 12, the top of the tower obtains a low-boiling solvent, which is condensed and returned to the azeotropic solvent tank 2 for reuse, and the bottom of the tower obtains a high-boiling organic silicon liquid phase Boiling monomer, the monomer enters the high boiling cracking unit 13;
[0045] (3) The high-boiling cracking device 13 performs high-boiling cracking on the organic silicon liquid phase high-boiling monomers, recovering effective components, and producing high-boiling methylchlorosilane;
[0046] (4) After the azeotropic evaporation kettle 4 stops evaporating, the residue in the kettle is filtered and dried through the residue filter 5 and the solid drying tower 6 in sequence, and the solid powder enters the waste powder deactivation device 8;
[0047] (5) The waste powder inactivation device 8 recycles the organic silicon waste powder and extracts valuable copper, silicon and other components.

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