CN102206348A - Secondary flash evaporation low molecular weight removing process and equipment - Google Patents
Secondary flash evaporation low molecular weight removing process and equipment Download PDFInfo
- Publication number
- CN102206348A CN102206348A CN2011100214562A CN201110021456A CN102206348A CN 102206348 A CN102206348 A CN 102206348A CN 2011100214562 A CN2011100214562 A CN 2011100214562A CN 201110021456 A CN201110021456 A CN 201110021456A CN 102206348 A CN102206348 A CN 102206348A
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- Prior art keywords
- flasher
- equipment
- low molecule
- low
- storage tanks
- Prior art date
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- 238000000034 method Methods 0.000 title abstract description 18
- 238000001704 evaporation Methods 0.000 title abstract description 6
- 230000008020 evaporation Effects 0.000 title abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 19
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000004945 silicone rubber Substances 0.000 claims abstract description 6
- 239000003054 catalyst Substances 0.000 claims abstract description 4
- 238000007701 flash-distillation Methods 0.000 claims description 19
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 10
- 150000007530 organic bases Chemical class 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 6
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- 125000003368 amide group Chemical group 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 claims description 2
- 238000006731 degradation reaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 abstract description 2
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- -1 methyl vinyl Chemical group 0.000 abstract 1
- 230000000379 polymerizing effect Effects 0.000 abstract 1
- 241001417501 Lobotidae Species 0.000 description 26
- 150000001875 compounds Chemical class 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 1
- 238000010092 rubber production Methods 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Silicon Polymers (AREA)
Abstract
The invention provides a secondary flash evaporation low molecular weight removing process and equipment. The equipment comprises two flash evaporators and two storage tanks, wherein the first flash evaporator is connected with the two storage tanks through pipeline valves respectively; and the two storage tanks are connected to the second flash evaporator through pipeline valves. The process comprises the following steps of: polymerizing materials; heating; removing low molecular weight by flash evaporation; standing the storage tanks; heating for the second time; performing flash evaporation for the second time; and discharging. The secondary flash evaporation low molecular weight removing process and equipment have the advantages that: 1, the two flash evaporators are connected in series, methyl vinyl high temperature vulcanized silicone rubber is kept stay enough time under high temperature and high vacuum conditions after being polymerized, a resolvent of a catalyst and unreacted dimethyl annulus are completely removed and escape from the methyl vinyl silicon rubber; 2, the area and the equivalent length for heat exchange are effectively increased; 3, the technical difficulty in equipment mechanical manufacture is reduced; 4, requirements for equipment materials are remarkably reduced; and 5, the load and the requirements for a vacuum system can be reduced.
Description
Technical field
The present invention relates to methyl ethylene high temperature silicon rubber production technology, low molecule Processes and apparatus is taken off in particularly a kind of secondary flash distillation.
Background technology
Along with the sharp increase of the market requirement, for the unit ability of producing methyl ethylene high temperature silicon rubber, also along with increasing.So also will increase thereupon to all production units.It is an important process link of producing methyl ethylene high temperature silicon rubber process that low molecule is taken off in flash distillation, and flash distillation is taken off to hang down and divided subset to make an exception certainly.For flash evaporation technology, must guarantee good heat transfer effect and enough heat transfer areas.Be exactly that material stops time enough in addition in flasher.According to the method for routine, strengthen the diameter of flasher exactly, improve the height of flasher, can also strengthen a little the aperture of flowing through of card certainly.But the consequent has been brought a lot of problems.At first the difficulty of processing of equipment has obviously improved, and along with the enlarged diameter of unit, for also corresponding raising of requirement of strength of material, so the manufacturing expense of equipment will rise significantly; It is two because the increase of the diameter of equipment, and perhaps the height of integral device improves, and the cost expense of the factory building that is bound to directly have influence on also can rise for the structural requirement of factory building thereupon.
Consider from vacuum system, should guarantee good vacuum tightness, must improve free air delivery, the technical difficulty that can satisfy stand-alone device is tangible.
Summary of the invention
In view of the consideration of above-mentioned disadvantage, the invention provides a kind of secondary flash distillation and take off low molecule Processes and apparatus.
Low molecule technology is taken off in secondary flash distillation of the present invention, and its concrete steps are as follows:
2) in proportion methyl ethylene high-molecular weight silicon rubber, catalyzer and in polymerization process fully the polymeric cyclosiloxane mix as material;
2) with high-pressure inert gas material is sent into first flasher thermal degradation in inert gas atmosphere, enter in the flasher of high vacuum with unusual multifibres strip, increase its surface-area suddenly, isolate low molecule through card;
3) under the severe condition of high temperature and high vacuum, in time becoming the lower catalyst decomposes thing of boiling point and a part of unreacted methyl cyclosiloxane extraction, the byproduct of extraction is collected in the low molecule container through condensation and cooling, reenter low molecule storage tank, continue to recycle;
4) material through single flash enters storage tank period of stop;
5) material in the storage tank is under the propelling of rare gas element, enter second flasher, in inert gas atmosphere, low molecule is further discharged under high vacuum and pyritous condition once more, obtain stablely at last, fugitive constituent meets the methyl ethylene high temperature vulcanizing silicone rubber product of ministerial standard fully.
Described catalyzer is the alkaline organic bases oxyhydroxide of band amido or the organic bases oxyhydroxide of band phosphorus base.
The low subset that divides is taken off in secondary flash distillation of the present invention, comprise flasher and storage tank, wherein: described flasher is two, be respectively first flasher and second flasher, first flasher is connected two storage tanks respectively by pipeline and valve, two storage tanks are connected to second flasher by pipeline and valve again, and first flasher respectively is connected a low molecule collector with second flasher.
Described flasher is provided with feeding mouth, well heater, card, flashing chamber, low subexit and the discharge port of dividing, and well heater is last, and flashing chamber is following, card is arranged between the two, feeding mouth is located at the heating chamber top, and the low subexit that divides is located at flashing chamber by the card height, and discharge port is in the bottom of flashing chamber.
Low molecule Processes and apparatus is taken off in secondary flash distillation of the present invention: guaranteed that methyl ethylene high temperature vulcanizing silicone rubber is after polymerization 1., fully the resolvent of catalyzer is removed totally, owing to be that two flashers are placed in-line, guaranteed that fully the material after the polymerization is under the condition of high temperature and high vacuum, stop time enough, make unreacted methyl ring body in enough distances of flowing through with being enough to, in methyl vinyl silicone rubber, overflow, collect in the low molecule receiver through condensation and cooling, recirculation is used; 2. the area and the equivalent length of heat exchange have been improved effectively; 3. reduced the technical difficulty during plant machinery is made; 4. the requirement for equipment material has also obviously reduced; 5. also can alleviate burden and requirement to vacuum system.
Description of drawings
Fig. 1 is the synoptic diagram that low molecule Processes and apparatus is taken off in secondary flash distillation of the present invention.
Embodiment
Below in conjunction with embodiment low molecule Processes and apparatus is taken off in secondary flash distillation of the present invention and do detailed explanation.
Fig. 1 is the synoptic diagram that low molecule Processes and apparatus is taken off in secondary flash distillation of the present invention.
The low subset that divides is taken off in secondary flash distillation of the present invention, is made up of following three parts.The top is first flasher 1, below first flasher two storage tanks arranged side by side 3, be used to receive the product after the flash distillation for the first time, orlop is second flasher 2, be connected with valve 5 by pipeline 4 respectively between two flashers and the storage tank, first flasher 1 respectively is connected a low molecule collector 6 with second flasher 2.
First flasher and the second flasher structure are basic identical, be respectively equipped with feeding mouth 1a, well heater 1b, card 1c, flashing chamber 1d, the low subexit 1e of branch and discharge port 1f, well heater 1b is last, flashing chamber 1d is following, card 1c is arranged between the two, feeding mouth 1a is located at heating chamber 1b top, and the low subexit 1e that divides is located at flashing chamber 1d side by card 1c height, and discharge port 1e is in the bottom of flashing chamber 1d.
The material that low molecule technology is taken off in secondary flash distillation of the present invention is by methyl ethylene high-molecular weight silicon rubber, improves the catalyzer of speed of response, and in polymerization process polymeric cyclosiloxane (low molecule) composition fully.
Catalyzer mainly is the alkaline organic bases oxyhydroxide that the band amido is arranged, perhaps with the organic bases oxyhydroxide of phosphorus base.The compound of this class can the ring-opening polymerization of catalysis cyclosiloxane under lower temperature, and after temperature raises, and just can be decomposed into catalysis and degrade all not act on new compound.The organic bases of amido at high temperature resolves into the alkylamine of low-carbon (LC) and the alcohol of low-carbon (LC).Can from polymkeric substance, discharge by heating and vacuum.And the compound of organophosphorus remains in the polymkeric substance with regard to the trialkylphosphine oxide that becomes organophosphorus behind high temperature.
Described material is at first heating in first flasher, allows catalyzer under the pyritous condition, resolves into next step harmless product.Under the pressure of controlled rare gas element, through card, the specific surface area of material is suddenly amplified.Enter in the flashing chamber of high vacuum with unusual multifibres strip, under the severe condition of high temperature and high vacuum, in time becoming the lower catalyst decomposes thing of boiling point and a part of unreacted methyl cyclosiloxane extraction, the byproduct of extraction is through condensation and cooling.Collect in the low molecule receiver.Reenter low molecule storage tank.Continue to recycle.
Product after the flash distillation for the first time enters process tank.Process tank is also shown two, can switch use.Each process tank all has the valve of vacuum and rare gas element.Can be used alternatingly arbitrarily according to the needs of processing condition.
The material of process tank is under the pressure of rare gas element, material is pushed in the partial flasher, low molecule at rare gas element is further discharged under high vacuum and pyritous condition once more, obtain stablely at last, fugitive constituent meets the methyl ethylene high temperature vulcanizing silicone rubber product of ministerial standard fully.
Claims (4)
1. low molecule technology is taken off in a secondary flash distillation, and it is characterized in that: described technology concrete steps are as follows:
1) in proportion methyl ethylene high-molecular weight silicon rubber, catalyzer and in polymerization process fully the polymeric cyclosiloxane mix as material;
2) with high-pressure inert gas material is sent into first flasher thermal degradation in inert gas atmosphere, enter in the flasher of high vacuum with unusual multifibres strip, increase its surface-area suddenly, isolate low molecule through card;
3) under the severe condition of high temperature and high vacuum, in time becoming the lower catalyst decomposes thing of boiling point and a part of unreacted methyl cyclosiloxane extraction, the byproduct of extraction is collected in the low molecule container through condensation and cooling, reenter low molecule storage tank, continue to recycle;
4) material through single flash enters storage tank period of stop;
5) under the propelling of material at rare gas element of single flash, enter second flasher, in inert gas atmosphere, low molecule is further discharged under high vacuum and pyritous condition once more, obtain stablely at last, fugitive constituent meets the methyl ethylene high temperature vulcanizing silicone rubber product of ministerial standard fully.
2. low molecule technology is taken off in secondary flash distillation according to claim 1, it is characterized in that: described catalyzer is the alkaline organic bases oxyhydroxide of band amido or the organic bases oxyhydroxide of band phosphorus base.
3. the low subset that divides is taken off in a secondary flash distillation, comprise flasher and storage tank, it is characterized in that: described flasher is two, be respectively first flasher and second flasher, first flasher connects two storage tanks respectively by pipeline valve, two storage tanks are connected to second flasher by pipeline valve again, and first flasher respectively is connected a low molecule collector with second flasher.
4. the low subset that divides is taken off in secondary flash distillation according to claim 3, it is characterized in that: described flasher is provided with feeding mouth, well heater, card, flashing chamber, low subexit and the discharge port of dividing, well heater is last, flashing chamber is following, card is arranged between the two, feeding mouth is located at the heating chamber top, and the low subexit that divides is located at flashing chamber by the card height, and discharge port is in the bottom of flashing chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110021456 CN102206348B (en) | 2011-01-19 | 2011-01-19 | Secondary flash evaporation low molecular weight removing process and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110021456 CN102206348B (en) | 2011-01-19 | 2011-01-19 | Secondary flash evaporation low molecular weight removing process and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102206348A true CN102206348A (en) | 2011-10-05 |
| CN102206348B CN102206348B (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110021456 Expired - Fee Related CN102206348B (en) | 2011-01-19 | 2011-01-19 | Secondary flash evaporation low molecular weight removing process and equipment |
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| Country | Link |
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| CN (1) | CN102206348B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102924721A (en) * | 2012-11-22 | 2013-02-13 | 深圳市森日有机硅材料有限公司 | Method for continuously preparing vinyl silicone oil |
| CN103642045A (en) * | 2013-11-21 | 2014-03-19 | 宜昌科林硅材料有限公司 | Efficient low molecule removal method for low viscosity silicone oil |
| CN107778488A (en) * | 2017-11-16 | 2018-03-09 | 湖北兴瑞化工有限公司 | A kind of de- low molecule device and the method that production viscosity is 30 1000000cs methyl-silicone oils |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921487A (en) * | 2009-06-15 | 2010-12-22 | 颜建平 | Methyl ethylene high temperature vulcanizing silicone rubber production technology |
-
2011
- 2011-01-19 CN CN 201110021456 patent/CN102206348B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921487A (en) * | 2009-06-15 | 2010-12-22 | 颜建平 | Methyl ethylene high temperature vulcanizing silicone rubber production technology |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102924721A (en) * | 2012-11-22 | 2013-02-13 | 深圳市森日有机硅材料有限公司 | Method for continuously preparing vinyl silicone oil |
| CN102924721B (en) * | 2012-11-22 | 2013-12-25 | 深圳市森日有机硅材料有限公司 | Method for continuously preparing vinyl silicone oil |
| CN103642045A (en) * | 2013-11-21 | 2014-03-19 | 宜昌科林硅材料有限公司 | Efficient low molecule removal method for low viscosity silicone oil |
| CN103642045B (en) * | 2013-11-21 | 2016-04-06 | 广州道林合成材料有限公司 | A kind of Efficient low molecule removal method for low viscosity silicone |
| CN107778488A (en) * | 2017-11-16 | 2018-03-09 | 湖北兴瑞化工有限公司 | A kind of de- low molecule device and the method that production viscosity is 30 1000000cs methyl-silicone oils |
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|---|---|
| CN102206348B (en) | 2013-05-08 |
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