CN104646388A - Trichlorosilane waste residue treatment system - Google Patents
Trichlorosilane waste residue treatment system Download PDFInfo
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- CN104646388A CN104646388A CN201310624282.8A CN201310624282A CN104646388A CN 104646388 A CN104646388 A CN 104646388A CN 201310624282 A CN201310624282 A CN 201310624282A CN 104646388 A CN104646388 A CN 104646388A
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- trichlorosilane
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Abstract
The invention provides a trichlorosilane waste residue treatment system. The trichlorosilane waste residue treatment system comprises a vacuum rake type dryer, a condenser, a vacuum pump, a collection tank, an acid circulating pump, an acid absorption tank and a synthetic solution storage tank. By virtue of the trichlorosilane waste residue treatment system, useful materials in waste residues can be sufficiently recycled so that the economic benefits are improved and the environment pollution is reduced. The vacuum rake type dryer is horizontal type interval conduction drying equipment; a rake blade on a central shaft is used and is rotated in forward and backward directions at intervals at fixed time; and materials are in contact with a barrel wall under the continuous stirring of the rake blade, and the surfaces are continuously updated and are indirectly heated by heat-conducting oil, so that moisture components in the materials are continuously gasified and are pumped in time by a vacuum pump. Under the effect of the vacuum degree, the boiling point of the moisture components is reduced; and the steam pressure of the moisture components on the surfaces of the materials is much greater than that of the moisture components in an evaporation space, and the drying is promoted, so that the drying aim is realized.
Description
Technical field
The invention belongs to chemical spent material process field, be specifically related to a kind of trichlorosilane Solid state fermentation system, by vacuum rake dryer, drying process is carried out to trichlorosilane waste residue.
Background technology
In production process of trichlorosilane, often containing impurity such as aluminium, iron, calcium in raw material silica flour, generating the metal chlorides such as aluminium chloride, iron chloride, calcium chloride with during hydrogen chloride gas pyroreaction, these materials very easily cause the blocking of subsequent condensation system pipeline and equipment.Up to standard completing production task to reach to produce, often by clearing up pipeline and condensing plant frequently, wasting a large amount of man power and material, service life of equipment is shortened, causing serious environmental pollution simultaneously.At present, trichlorosilane manufacturer is in order to reduce the blocking of metal chloride to pipeline and equipment, introduce Wet-way dust-collector one after another, this device adopts tower spray process, adopt silicon tetrachloride as by-product in trichlorosilane technique to make washing agent, absorb the chloride in crude synthesis gas, this device reduces the chocking-up degree of pipeline that subsequent material causes in main condenser condensation process and equipment to greatest extent, extend the stable operation cycle, the security that the system that substantially increases is produced and continuity.But along with the operation of this device, occurred again new problem, the dreg liquid after spray-absorption can not obtain well dry process, causes the waste of part chlorosilane on the one hand, causes serious environmental pollution on the other hand.For these problems, technique and the appliance arrangement of more economical, more environmental protection must be selected, waste residue is processed.
In conventional production process of trichlorosilane, raw material silica flour and hydrogen chloride gas generate trichlorosilane crude synthesis gas containing a large amount of dust synthesizing reaction in furnace, this synthesis gas passes through cyclone separator, after a series of cleaner such as sack cleaner, trichlorosilane liquid is condensed into again through multi-stage condensing equipment, after rectifying column rectifying, obtain highly purified trichlorosilane products.Before crude synthesis gas enters condensing plant in wet dedusting technical process, in order to reduce metal chloride in synthesis gas, condensing plant being resulted in blockage, before entering condenser, being introduced into the tower of giving a dinner of welcome of wet dedusting, washing away the dust such as metal chloride and silica flour.Synthesis gas clean after tower of giving a dinner of welcome enters condenser more successively.The silicon tetrachloride liquid of a large amount of dust of spray-absorption in tower of giving a dinner of welcome becomes thickness after repeatedly circulation, regularly branch to agitator tank by circulating pump, agitator tank chuck is connected with steam, carries out preliminary evaporation drying recovery by agitator tank to this liquid, this liquid becomes thickness more, is called waste residue.Containing a large amount of chlorosilane liquid produceds and metal chloride in waste residue, if do not add process, cause the waste of chlorosilane on the one hand, cause serious environmental pollution not on the one hand.
Summary of the invention
Key problems-solving of the present invention is to provide a kind for the treatment of system of trichlorosilane waste residue, carries out drying process by vacuum rake dryer to waste residue, fully reclaims the chlorosilane in waste residue, increases economic efficiency, reduce environmental pollution.
The present invention is achieved through the following technical solutions:
A kind for the treatment of system of trichlorosilane waste residue, comprise vacuum rake dryer, condenser, vavuum pump, collecting tank, acid circulating pump, acid tourie and synthesis liquid storage tank, the gaseous phase outlet that vacuumizes of described vacuum rake dryer connects 5 DEG C of water condensers successively, the first-35 DEG C water condensers, described 5 DEG C of water condensers are all connected collecting tank with the condensate outlet of the first-35 DEG C water condensers, the gaseous phase outlet of described collecting tank connects the second-35 DEG C water condensers through vavuum pump, the liquid-phase outlet of described collecting tank is connected synthesis liquid storage tank with the condensate outlet of the second-35 DEG C water condensers, the evaporation gaseous phase outlet of described vacuum rake dryer connects sour tourie, acid tourie liquid-phase outlet connects sour tourie liquid phase entrance and eluting column respectively by acid circulating pump again.
According to the treatment system of above-mentioned trichlorosilane waste residue, the pipeline between described each device is equipped with valve.
Positive beneficial effect of the present invention:
The present invention fully can reclaim the useful materials in waste residue, increases economic efficiency, and reduces environmental pollution.
(1) the horizontal interval apparatus for conductive drying of vacuum rake dryer system, the machine is by means of the rake leaf on central shaft, the forward and reverse rotation of fixed time interval, under the continuous stirring of rake leaf, when material contacts with barrel, surface is constantly updated, and is subject to conduction oil indirect, wet part in material is constantly vaporized, is extracted out in time by vavuum pump simultaneously.Under the effect of vacuum, wet part boiling point reduces, and the wet part vapour pressure in material surface is conducive to its inner wet part evaporation much larger than wet part vapour pressure of evaporating space in machine, facilitates drying, thus reaches dry object.
(2) due to metal oxide AlCl
3special nature, at normal atmospheric pressure, 177.8 DEG C of distillations.In like manner under vacuum conditions, along with AlCl
3the reduction of saturated vapor pressure, just has the possibility of distillation under lower temperature, be so just easy to cause AlCl in postorder pipeline
3solidifying of gas, blocking pipe.For meeting technological requirement, often when charging in early stage, add a certain amount of complexing agent, when this complexing agent makes material be evacuated, metal chlorination aluminium is not easily distilled out of, and after under vacuum, chlorosilane is distilled out of, then intensification steams aluminium chloride, reduces environmental pollution.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 schematic diagram.
In figure, 1 is rake type dryer, and 2 is 5 DEG C of water condensers, and 3 is the first-35 DEG C water condensers, and 4 is collecting tank, and 5 is vavuum pump, and 6 is the second-35 DEG C water condensers, and 7 is acid circulating pump, and 8 is sour tourie, and 9 is synthesis liquid storage tank.
Detailed description of the invention
Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in more detail, but the invention is not restricted to these embodiments.
Embodiment 1
A kind for the treatment of system of trichlorosilane waste residue, comprise vacuum rake dryer, condenser, vavuum pump, collecting tank and synthesis liquid storage tank, the gaseous phase outlet that vacuumizes of described vacuum rake dryer connects 5 DEG C of water condensers successively, the first-35 DEG C water condensers, described 5 DEG C of water condensers are all connected collecting tank with the condensate outlet of the first-35 DEG C water condensers, the gaseous phase outlet of described collecting tank connects the second-35 DEG C water condensers through vavuum pump, the liquid-phase outlet of described collecting tank is connected synthesis liquid storage tank with the condensate outlet of the second-35 DEG C water condensers, the evaporation gaseous phase outlet of described vacuum rake dryer connects sour tourie, acid tourie liquid-phase outlet connects sour tourie liquid phase entrance and eluting column respectively by acid circulating pump again.
The processing procedure first step reclaims chlorosilane: waste residue material enters vacuum rake dryer after stirring, and then add complexing agent, when material is evacuated, metal chlorination aluminium is not easily distilled out of.Rake type dryer is by heat-conducting oil heating and carry out drying to material under the effect of vavuum pump, and enter collecting tank by 5 DEG C of water condensers ,-35 DEG C of water condensers successively after gas phase steam is drawn out of, the liquid that condensation obtains is delivered to synthesis liquid storage tank through collecting tank.Uncooled gas is extracted out after-35 DEG C of water condenser coolings through vavuum pump, and condensate liquid is directly delivered to synthesis liquid storage tank, and uncooled gas enters drip washing and absorbs process.
Processing procedure second step evaporation aluminium chloride, very easily the characteristic of hydrochloric acid contaminated environment is generated with the reaction of moisture in air because aluminium chloride has, and need to be washed recovery, namely after vacuumizing end, continue to be warming up to close to aluminium chloride boiling point values, by the aluminium chloride in material by acid circulating pump and sour tourie water absorption, when being circulated to acid concentration about 10%, spent acid being beaten to drip washing pond and absorbing.
Finally, at the end of the waste residue material evaporation in collecting tank in rake type dryer, be cooled to normal temperature by conduction oil, drying solid is drawn off from rake type dryer cylindrical shell lower openings.
The present invention is not limited to above-mentioned detailed description of the invention, and those skilled in the art also can make multiple change accordingly, but to be anyly equal to the present invention or similar change all should be encompassed in the scope of the claims in the present invention.
Claims (2)
1. the treatment system of a trichlorosilane waste residue, it is characterized in that: comprise vacuum rake dryer, condenser, vavuum pump, collecting tank, acid circulating pump, tourie and synthesis liquid storage tank, the gaseous phase outlet that vacuumizes of described vacuum rake dryer connects 5 DEG C of water condensers successively, the first-35 DEG C water condensers, described 5 DEG C of water condensers are all connected collecting tank with the condensate outlet of the first-35 DEG C water condensers, the gaseous phase outlet of described collecting tank connects the second-35 DEG C water condensers through vavuum pump, the liquid-phase outlet of described collecting tank is connected synthesis liquid storage tank with the condensate outlet of the second-35 DEG C water condensers, the evaporation gaseous phase outlet of described vacuum rake dryer connects sour tourie, acid tourie liquid-phase outlet connects sour tourie liquid phase entrance and eluting column respectively by acid circulating pump again.
2. the treatment system of trichlorosilane waste residue according to claim 1, is characterized in that: the pipeline between described each device is equipped with valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310624282.8A CN104646388A (en) | 2013-11-22 | 2013-11-22 | Trichlorosilane waste residue treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310624282.8A CN104646388A (en) | 2013-11-22 | 2013-11-22 | Trichlorosilane waste residue treatment system |
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| CN104646388A true CN104646388A (en) | 2015-05-27 |
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| CN201310624282.8A Pending CN104646388A (en) | 2013-11-22 | 2013-11-22 | Trichlorosilane waste residue treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108286886A (en) * | 2018-03-28 | 2018-07-17 | 梧州黄埔化工药业有限公司 | A kind of method and apparatus of oxalic acid drying |
-
2013
- 2013-11-22 CN CN201310624282.8A patent/CN104646388A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108286886A (en) * | 2018-03-28 | 2018-07-17 | 梧州黄埔化工药业有限公司 | A kind of method and apparatus of oxalic acid drying |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150527 |
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| WD01 | Invention patent application deemed withdrawn after publication |