CN104129767B - A kind of purifying plant of phosphorus pentafluoride - Google Patents
A kind of purifying plant of phosphorus pentafluoride Download PDFInfo
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- CN104129767B CN104129767B CN201410403258.6A CN201410403258A CN104129767B CN 104129767 B CN104129767 B CN 104129767B CN 201410403258 A CN201410403258 A CN 201410403258A CN 104129767 B CN104129767 B CN 104129767B
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- rectifying tower
- phosphorus pentafluoride
- thermal source
- heat exchanger
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Abstract
The invention discloses a kind of purifying plant of phosphorus pentafluoride, comprise rectifying tower, interchanger, Freon-Evaporator, described rectifying tower comprises inlet mouth, be located at the air outlet on described rectifying tower top, be located at the liquid exit of described rectifying tower bottom, be located at the special tubular heat exchanger of described rectifier, be located at heat exchange chamber in the middle part of described rectifying tower, described rectifying tower bottom is also provided with thermal source, and described thermal source is R-23 refrigeration agent; When the phosphorus pentafluoride gas containing impurity passes in rectifying tower, phosphorus pentafluoride accurately can be maintained liquid state by thermal source R-23, and ensures the liquefaction ratio of phosphorus pentafluoride, effectively improves the efficiency of purification.
Description
Technical field
The present invention relates to a kind of purifying plant of phosphorus pentafluoride.
Background technology
Phosphorus pentafluoride (PF
5) be the catalyzer that a kind of chemical industry is commonly used, it is gaseous state at normal temperatures and pressures, containing impurity such as hydrogen fluoride, phosphorus trifluoride, nitrogen, fluorine gas, therefore need to purify to phosphorus pentafluoride, and method of purification of the prior art often controls bad temperature, if temperature is too high, phosphorus pentafluoride then can not be made to liquefy be separated, if temperature is too low, then phosphorus pentafluoride can condense into solid-state, meanwhile, because heat-exchanger rig can produce the change of temperature when absorbing heat heat release, the ratio of phosphorus pentafluoride gas liquefaction can be had influence on, purification rate cannot be ensured.
Summary of the invention
In order to overcome the defect of prior art, the object of this invention is to provide a kind of purifying plant of phosphorus pentafluoride, comprise rectifying tower, interchanger, Freon-Evaporator, described rectifying tower comprises inlet mouth, be located at the air outlet on described rectifying tower top, be located at the liquid exit of described rectifying tower bottom, be located at the special tubular heat exchanger of described rectifier, be located at heat exchange chamber in the middle part of described rectifying tower, it is characterized in that: described rectifier bottoms is also provided with thermal source, described thermal source is R-23 refrigeration agent, and described thermal source temperature in heat exchanging process roughly remains unchanged.
Preferably, the tube side medium in described special tubular heat exchanger is liquid nitrogen.
Preferably, described rectifying tower also comprises the special tubular heat exchanger inlet and thermal source inlet that are communicated with described rectifying tower.
Preferably, be special tubular heat exchange device in described heat exchange chamber, namely select stainless steel tube to carry out interior polished finish, the process of mouth of pipe flanging, guarantee in pipe, not have condensation attachment ground.
Compared to prior art, the present invention selects R-23 as thermal source, selects liquid nitrogen as special tubular heat exchanger, phosphorus pentafluoride is liquefied just, separation of can either liquefying, can ensures again to solidify, the temperature of thermal source roughly remains unchanged simultaneously, effectively ensure that purification rate.
Accompanying drawing explanation
Accompanying drawing 1 is the purifying plant schematic diagram of a kind of phosphorus pentafluoride of the present invention.
In accompanying drawing:
1-rectifying tower, 2-inlet mouth, 3-air outlet, 4-liquid exit, the special tubular heat exchanger of 5-, 6-thermal source, 7-heat exchange chamber, the special tubular heat exchanger inlet of 8-, 9-thermal source inlet, 10-interchanger, 11-Freon-Evaporator.
Embodiment
Be described in detail below in conjunction with the preferred implementation of accompanying drawing to the purifying plant of a kind of phosphorus pentafluoride of the present invention.
As shown in Figure 1, the present invention includes rectifying tower 1, interchanger 10, Freon-Evaporator 11, rectifying tower 1 being provided with the inlet mouth 2 for passing into impure phosphorus pentafluoride gas, being provided with air outlet 3 on the top of rectifying tower 1, discharge for the waste gas will be left after purification, liquid exit 4 is provided with, for the phosphorus pentafluoride after purification is expelled to storage tank in rectifying tower bottom.
Be provided with special tubular heat exchanger 5 on the top of rectifying tower, the tube side medium in special tubular heat exchanger 5 is preferably liquid nitrogen, because the temperature of liquid nitrogen is about-193 DEG C, therefore, it is possible to all liquefied by all components of impure phosphorus pentafluoride gas, be provided with thermal source 6 in the bottom of rectifying tower, thermal source chooses trifluoromethane here, is also R-23 refrigeration agent, under the normal atmosphere of routine, the boiling point of R-23 refrigeration agent is-82.1 DEG C, zero pour is-155 DEG C, the boiling point of phosphorus pentafluoride-84.6 DEG C, zero pour is-93.8 DEG C, because the boiling point of R-23 refrigeration agent and phosphorus pentafluoride is comparatively close, and the zero pour of phosphorus pentafluoride and its boiling point are also comparatively close, can by suitably pressurizeing to phosphorus pentafluoride in the present embodiment, near the boiling point boiling point of phosphorus pentafluoride being brought up to R-23 refrigeration agent, the temperature of R-23 refrigeration agent is remained on its boiling point simultaneously, liquid phase transformation with gaseous state only occurs such R-23 refrigeration agent but temperature roughly remains unchanged, thus the liquefied fraction of gaseous state phosphorus pentafluoride is stablized, ensure that the purification efficiency of phosphorus pentafluoride.Rectifying tower 1 is respectively equipped with special tubular heat exchanger inlet 8 and thermal source inlet 9, for supplementing special tubular heat exchanger 5 and thermal source 6.
The middle portion of rectifying tower 1 is the region of supplied gas generation heat exchange, also be heat exchange chamber 7, here in order to prevent the high boiling component in gas from freezing in the process of heat exchange, have employed special tubular heat exchanger, just liquid state is formed when ascending gas runs into special tubular heat exchanger 5, when not also being able to do in time to be frozen into solid-state further, along the pipeline of tubular heat exchanger toward dirty, freezing of high boiling component will be avoided.
Below the whole process of the purifying plant work of phosphorus pentafluoride of the present invention is described.
Impure phosphorus pentafluoride gas from inlet mouth 2 through filtration after, enter interchanger 10, rectifying tower 1 is entered after removing hydrogen fluoride, contact with special tubular heat exchanger 5, because special tubular heat exchanger 5 is liquid nitrogen, the whole components in therefore impure phosphorus pentafluoride gas start to lower the temperature and are converted into liquid state, inwall along special tubular heat exchanger flows downward, when flowing to the bottom of rectifying tower 1, touching the thermal source 6 flashing to gaseous state through Freon-Evaporator 11, is also R-23 refrigeration agent; Because the temperature of the impure phosphorus pentafluoride gas of post liquefaction is far below the temperature of thermal source R-23, therefore R-23 starts heat release, and the boiling point of phosphorus pentafluoride after pressurization is the highest, close with the boiling point of R-23 refrigeration agent, therefore when the gas of other post liquefaction gasifies again, major part phosphorus pentafluoride is also in liquid state, and only have small part phosphorus pentafluoride to volatilize in gaseous state, the phosphorus pentafluoride of such operative liquid has been deposited in the bottom of rectifying tower 1; R-23 becomes liquid state from gaseous state after discharging heat, but temperature roughly remains unchanged, and therefore the liquefaction ratio of phosphorus pentafluoride maintains stable, makes the efficiency of purifying obtain guarantee.After all impure phosphorus pentafluoride gas are purified by inlet mouth 2, remaining waste gas is discharged from air outlet 3, and the phosphorus pentafluoride of liquid state is discharged by liquid exit 4, pressurization tinning.Special tubular heat exchanger 5 and thermal source 6 are connected to special tubular heat exchanger inlet 8 and thermal source inlet 9, in order to supplement used up cold and heat source.
Compared to prior art, it is thermal source that the purifying plant of phosphorus pentafluoride of the present invention make use of R-23 refrigeration agent, accurately phosphorus pentafluoride is remained on liquid state, and R-23 refrigeration agent is originally temperature-resistant when heat absorption and heat release simultaneously, make the proportions constant that phosphorus pentafluoride liquefies, its efficiency of purifying is protected.
Above-described embodiment is only for illustrating technical conceive of the present invention and feature; its object is to person skilled in the art can be understood content of the present invention and implement according to this; can not limit the scope of the invention with this; all equivalences done according to spirit of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (4)
1. the purifying plant of a phosphorus pentafluoride, comprise rectifying tower (1), interchanger (10), Freon-Evaporator (11), described rectifying tower (1) comprises inlet mouth (2), be located at the air outlet (3) on described rectifying tower (1) top, be located at the liquid exit (4) of described rectifying tower (1) bottom, be located at the special tubular heat exchanger (5) on described rectifying tower (1) top, be located at the heat exchange chamber (7) at described rectifying tower (1) middle part, it is characterized in that: described rectifying tower (1) bottom is also provided with thermal source (6), described thermal source (6) is R-23 refrigeration agent, described thermal source (6) temperature in heat exchanging process roughly remains unchanged, described special tubular heat exchanger (5) comprises heat transfer tube, described heat transfer tube is made up of the stainless steel tube through interior polished finish, the mouth of pipe of described stainless steel tube is through flanging process.
2. phosphorus pentafluoride purifying plant according to claim 1, is characterized in that: the tube side medium in described special tubular heat exchanger (5) is liquid nitrogen.
3. phosphorus pentafluoride purifying plant according to claim 1, is characterized in that: described rectifying tower (1) also comprises the special tubular heat exchanger inlet (8) and thermal source inlet (9) that are communicated with described rectifying tower (1) respectively.
4. phosphorus pentafluoride purifying plant according to claim 1, it is characterized in that: be special tubular heat exchange device in described heat exchange chamber (7), described special tubular heat exchange device comprises heat transfer tube, described heat transfer tube is made up of the stainless steel tube through interior polished finish, and the mouth of pipe of described stainless steel tube is through flanging process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410403258.6A CN104129767B (en) | 2014-08-15 | 2014-08-15 | A kind of purifying plant of phosphorus pentafluoride |
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| CN201410403258.6A CN104129767B (en) | 2014-08-15 | 2014-08-15 | A kind of purifying plant of phosphorus pentafluoride |
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| CN104129767A CN104129767A (en) | 2014-11-05 |
| CN104129767B true CN104129767B (en) | 2016-02-24 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391760A (en) * | 2008-10-28 | 2009-03-25 | 中南大学 | Method for preparing high purity phosphorus pentafluoride gas |
| CN101417791A (en) * | 2008-11-17 | 2009-04-29 | 袁翔云 | Technique for preparing phosphorus pentafluoride |
| CN102372264A (en) * | 2010-08-18 | 2012-03-14 | 汕头市金光高科有限公司 | Phosphorus pentafluoride purifying method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8784763B2 (en) * | 2009-03-13 | 2014-07-22 | Honeywell International Inc. | Methods and reactor designs for producing phosphorus pentafluoride |
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- 2014-08-15 CN CN201410403258.6A patent/CN104129767B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391760A (en) * | 2008-10-28 | 2009-03-25 | 中南大学 | Method for preparing high purity phosphorus pentafluoride gas |
| CN101417791A (en) * | 2008-11-17 | 2009-04-29 | 袁翔云 | Technique for preparing phosphorus pentafluoride |
| CN102372264A (en) * | 2010-08-18 | 2012-03-14 | 汕头市金光高科有限公司 | Phosphorus pentafluoride purifying method |
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| CN104129767A (en) | 2014-11-05 |
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