CA1071527A - Apparatus and process for use in absorbing in a liquid medium a gas which evolves heat on absorption - Google Patents
Apparatus and process for use in absorbing in a liquid medium a gas which evolves heat on absorptionInfo
- Publication number
- CA1071527A CA1071527A CA249,667A CA249667A CA1071527A CA 1071527 A CA1071527 A CA 1071527A CA 249667 A CA249667 A CA 249667A CA 1071527 A CA1071527 A CA 1071527A
- Authority
- CA
- Canada
- Prior art keywords
- casing
- gas
- liquid medium
- plates
- tubes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus suitable for use in the absorption in a liquid medium of a gas which evolves heat on absorption, which apparatus comprises a casing which encloses a bundle of tubes and two spaced-apart tube-plates to which the tubes are fixed and through which the tubes extend; at least one conduit for feeding the absorbing liquid medium at a point above the tube bundle, means for distributing the liquid medium in the form of a film in the interior of the tubes; at least one conduit for introducing the gas to be absorbed into that region of the casing below the tube bundle; at least one conduit in a lower end region of the casing for the withdrawal from the casing of the solution of gas absorbed in liquid medium; at least one conduit in an upper end region of the casing for the withdrawal from the casing of non-absorbed gas; at least one inlet and at least one outlet conduit for a coolant to be passed through that zone defined by the casing, tube-plates and the exterior of the tubes, these inlet and outlet conduits communicating with that zone; one or more plates arranged in the interior of the casing above the tube bundle; and means for directing in-fluent liquid medium onto the one or more plates. And, a pro-cess for absorbing in a liquid medium a gas which evolves heat on absorption using such an apparatus.
An apparatus suitable for use in the absorption in a liquid medium of a gas which evolves heat on absorption, which apparatus comprises a casing which encloses a bundle of tubes and two spaced-apart tube-plates to which the tubes are fixed and through which the tubes extend; at least one conduit for feeding the absorbing liquid medium at a point above the tube bundle, means for distributing the liquid medium in the form of a film in the interior of the tubes; at least one conduit for introducing the gas to be absorbed into that region of the casing below the tube bundle; at least one conduit in a lower end region of the casing for the withdrawal from the casing of the solution of gas absorbed in liquid medium; at least one conduit in an upper end region of the casing for the withdrawal from the casing of non-absorbed gas; at least one inlet and at least one outlet conduit for a coolant to be passed through that zone defined by the casing, tube-plates and the exterior of the tubes, these inlet and outlet conduits communicating with that zone; one or more plates arranged in the interior of the casing above the tube bundle; and means for directing in-fluent liquid medium onto the one or more plates. And, a pro-cess for absorbing in a liquid medium a gas which evolves heat on absorption using such an apparatus.
Description
This invention relates to an apparatus and a process suitable for use in absorbing in a liquid medium a gas which evolves heat on absorption in the liquid medium.
More particularly, but not exclusively, the present invention relates to an appara-tus adapted to absorb with water the ammonia in an ammonia-containing gaseous mixture~ In much of the following description, reference will be made to this par-ticular case, although it is to be appreciated that the appara-tus can be used for the absorption in a liquid medium of any heat-evolving gaseous substance.
It is known from Italian Patent Specifications Nos.
891,098, granted on October 1st, 1971, 907,085, granted on February 15, 1972 and 953,035, granted on August 10, 1973, that the absorption of NH3,with water can be carried out with verti cally disposed film-exchangers. The main feature of such appara-tuses is that a single surface is used for simultaneously effect-ing two operations, namely the transEer of materials (i.e. ab-sorption of ammonia gas in water) and the heat transfer (i~e.
the transfer of the heat evolved on absorption of NH3 in water).
The use of these apparatus can be particularly useful in all those cases in which the transfer of materials is conditioned by the removal of heat as particularly occurs in the operation of absorbing NH3 with water.
Nonetheless the known apparatuses have the defect that to permit the optimum absorption of the gas, they have to be of considerable length, the result being an increase of their cost and their weight.
It has now been found ~hat it is possible to reduce considerably the length of the film absorption unit by causing the absorp-tion of the last residual amounts of ammonia to take place on one or more adiabatic plates, whereby the heat evolved on absorption ls transferred to the gas.
According to the present invention there is provided an apparatus suitable for use in the absorption in a liquid me-dium of gas which evolves heat on absorption, which appara-tus comprises a casing which encloses a bundle of tubes and two spaced aparttube~lates to which the tubes are fixed and through which the tubes extend; at least one conduit for feeding the absorbing liquid medium at a point above the tube bundle; means for distributing the liquid medium in the form of a film in the interior of the tubes; at least one conduit for introducing the gas to be adsorbed into that region of the casing below the tube bundle; at least one conduit in a lower end region of the casing for the withdrawal from the casing of the solution of gas absorbed in liquid medium; at leastone conduit in an upper end region of the casing for the withdrawal from the casing of non-absorbed gas; at least one inlet and at least one outlet conduit for a coolant to be passed through that zone defined by the casing.tube-plates and the e~terior of the tubes, these inlet and outlet conduits communicating with that zone; one or . more plates arranged in the interior of the casing above the tube bundle; and means for directing influent liquid medium onto the one or more plates.
Preferably the means for directing the influent liqui.d medium onto the one or more plates causes the liquid medium to be sprayed or sprinkled onto the plates.
According to the present invention there is also pro-vided a process for absorbing in a liquid medium a gas which evolves heat on absorptio~comprising~directing absorbing liquid medium onto the one or more plates provided inside a casing of the apparatus as above defined, introducing gas to be absorbed into a lower end region of the casing, passing coolant through a zone between the tube-~ates, withdrawing a solution of gas absorbed in liquid medium from a lower end region of the casing, and withdrawing any non-absorbed gas from an upper end region ,. . ..
. -- 2 of the casing.
For a better understanding of the present invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing, in which:
Figure 1 is a vertical section through a known appara-tus; and Figure 2 is a vertical section through one embodiment of the apparatus according to the present invention.
Referring firstly to Figure 1, the prior art appara-tus comprises a casing 1 containing a bundle of tubes (only one 2 of which is shown) extending through and fixed to tube-plates 3 and 4. Also provided are a conduit 5 for introducing ammonia-containing gas into the lower end region of the casing 1, a conduit 6 for introducing water or another absorbing liquor into the upper end region of the casing, a conduit 7 for withdrawing the resulting ammoniacal solu-tion, a conduit 8 for withdrawing substantially ammonia-free gas, and conduits 9 and 10, respectively the inlet and the outlet for the coolant liquid.
Referring now to the novel apparatus of Figure 2, the reference numerals 1 to 10 indicate the same components as in-dicated above. Also present is a conduit 11 for introducing water (or another absorbing liquor) into an upper region of casing 1. Between the conduit 11 and the bundle of tubes 2 are plates 12, 13, 14, 15 where ammonia can be adiabatically ab-sorbed by water. Optionally the conduit 6 can be dispensed with, in which case the water can be fed entirely through conduit 11.
The present invention will now be illustrated by the following Example carried out in the apparatus of Figure 2. In Run No. 1 the adiabatic plates~, 13, 14 and 15 were removed, whereas in Run No. 2 these plates were in position.
EXAMPLE
Run No. 1 Run No. 2 Rate of flow of the influent gas via pipe 5 1,~20 normal cubic 1,970 normal cubic metres per hour metres per hour Influent gas temperature 50C 50C
Influent gas p~essure 200 kg/sq.cm200 kg/sq.cm absolute.absolute.
Influent gas composition:
N2+3H2 85.85% by volume 86.3% by volume NH3 14.15% by volume 13.7% byvolume Effluent gas composition in pipe ~:
N2+3H2 96.1% by volume 97.8% by volume NEl3 3.9% by volume 2.2 by volume Effluent gas tempera~ure 30 C 50 C
Temperature of the cooling water in the inlet conduit 9 28C 28C
Rate of introduction of the absorption water 48 kg/hour43 kg/hour (in pipe 6)(in pipe 11) Concentration of the ammoniacal solution in pipe 7 76.~% 80.5%
Rate of absorption of NH3 155 kg/hour 170 kg/hour Owing to the addition of the adiabatic plates in the manner described above the following advantages can be obtained:-an increase in the quantity of the absorbed NH3;
a significant reduction in the content of residual NH3 in the effluent gas; and the production of a more concentrated ammoniacal so-lution.
In order to obtain the same performance in a conven-tional film absorber not provided with the adiabatic plate unit, the exchange surface would have to be considerably increased.
Attention is drawn,in addition, to the temperature increase of the gas emerging from the adiabatic pla-te unit, ~ 10~5~7 compared ~o that when no adiabatic plate unit i8 employed.As a matter of fact, the temperature rises from 30C to 50C, and it is on account of this temperature rise and.the associated withdrawn heat that it is possible to improve the overall performance of the absorption unit.
More particularly, but not exclusively, the present invention relates to an appara-tus adapted to absorb with water the ammonia in an ammonia-containing gaseous mixture~ In much of the following description, reference will be made to this par-ticular case, although it is to be appreciated that the appara-tus can be used for the absorption in a liquid medium of any heat-evolving gaseous substance.
It is known from Italian Patent Specifications Nos.
891,098, granted on October 1st, 1971, 907,085, granted on February 15, 1972 and 953,035, granted on August 10, 1973, that the absorption of NH3,with water can be carried out with verti cally disposed film-exchangers. The main feature of such appara-tuses is that a single surface is used for simultaneously effect-ing two operations, namely the transEer of materials (i.e. ab-sorption of ammonia gas in water) and the heat transfer (i~e.
the transfer of the heat evolved on absorption of NH3 in water).
The use of these apparatus can be particularly useful in all those cases in which the transfer of materials is conditioned by the removal of heat as particularly occurs in the operation of absorbing NH3 with water.
Nonetheless the known apparatuses have the defect that to permit the optimum absorption of the gas, they have to be of considerable length, the result being an increase of their cost and their weight.
It has now been found ~hat it is possible to reduce considerably the length of the film absorption unit by causing the absorp-tion of the last residual amounts of ammonia to take place on one or more adiabatic plates, whereby the heat evolved on absorption ls transferred to the gas.
According to the present invention there is provided an apparatus suitable for use in the absorption in a liquid me-dium of gas which evolves heat on absorption, which appara-tus comprises a casing which encloses a bundle of tubes and two spaced aparttube~lates to which the tubes are fixed and through which the tubes extend; at least one conduit for feeding the absorbing liquid medium at a point above the tube bundle; means for distributing the liquid medium in the form of a film in the interior of the tubes; at least one conduit for introducing the gas to be adsorbed into that region of the casing below the tube bundle; at least one conduit in a lower end region of the casing for the withdrawal from the casing of the solution of gas absorbed in liquid medium; at leastone conduit in an upper end region of the casing for the withdrawal from the casing of non-absorbed gas; at least one inlet and at least one outlet conduit for a coolant to be passed through that zone defined by the casing.tube-plates and the e~terior of the tubes, these inlet and outlet conduits communicating with that zone; one or . more plates arranged in the interior of the casing above the tube bundle; and means for directing influent liquid medium onto the one or more plates.
Preferably the means for directing the influent liqui.d medium onto the one or more plates causes the liquid medium to be sprayed or sprinkled onto the plates.
According to the present invention there is also pro-vided a process for absorbing in a liquid medium a gas which evolves heat on absorptio~comprising~directing absorbing liquid medium onto the one or more plates provided inside a casing of the apparatus as above defined, introducing gas to be absorbed into a lower end region of the casing, passing coolant through a zone between the tube-~ates, withdrawing a solution of gas absorbed in liquid medium from a lower end region of the casing, and withdrawing any non-absorbed gas from an upper end region ,. . ..
. -- 2 of the casing.
For a better understanding of the present invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing, in which:
Figure 1 is a vertical section through a known appara-tus; and Figure 2 is a vertical section through one embodiment of the apparatus according to the present invention.
Referring firstly to Figure 1, the prior art appara-tus comprises a casing 1 containing a bundle of tubes (only one 2 of which is shown) extending through and fixed to tube-plates 3 and 4. Also provided are a conduit 5 for introducing ammonia-containing gas into the lower end region of the casing 1, a conduit 6 for introducing water or another absorbing liquor into the upper end region of the casing, a conduit 7 for withdrawing the resulting ammoniacal solu-tion, a conduit 8 for withdrawing substantially ammonia-free gas, and conduits 9 and 10, respectively the inlet and the outlet for the coolant liquid.
Referring now to the novel apparatus of Figure 2, the reference numerals 1 to 10 indicate the same components as in-dicated above. Also present is a conduit 11 for introducing water (or another absorbing liquor) into an upper region of casing 1. Between the conduit 11 and the bundle of tubes 2 are plates 12, 13, 14, 15 where ammonia can be adiabatically ab-sorbed by water. Optionally the conduit 6 can be dispensed with, in which case the water can be fed entirely through conduit 11.
The present invention will now be illustrated by the following Example carried out in the apparatus of Figure 2. In Run No. 1 the adiabatic plates~, 13, 14 and 15 were removed, whereas in Run No. 2 these plates were in position.
EXAMPLE
Run No. 1 Run No. 2 Rate of flow of the influent gas via pipe 5 1,~20 normal cubic 1,970 normal cubic metres per hour metres per hour Influent gas temperature 50C 50C
Influent gas p~essure 200 kg/sq.cm200 kg/sq.cm absolute.absolute.
Influent gas composition:
N2+3H2 85.85% by volume 86.3% by volume NH3 14.15% by volume 13.7% byvolume Effluent gas composition in pipe ~:
N2+3H2 96.1% by volume 97.8% by volume NEl3 3.9% by volume 2.2 by volume Effluent gas tempera~ure 30 C 50 C
Temperature of the cooling water in the inlet conduit 9 28C 28C
Rate of introduction of the absorption water 48 kg/hour43 kg/hour (in pipe 6)(in pipe 11) Concentration of the ammoniacal solution in pipe 7 76.~% 80.5%
Rate of absorption of NH3 155 kg/hour 170 kg/hour Owing to the addition of the adiabatic plates in the manner described above the following advantages can be obtained:-an increase in the quantity of the absorbed NH3;
a significant reduction in the content of residual NH3 in the effluent gas; and the production of a more concentrated ammoniacal so-lution.
In order to obtain the same performance in a conven-tional film absorber not provided with the adiabatic plate unit, the exchange surface would have to be considerably increased.
Attention is drawn,in addition, to the temperature increase of the gas emerging from the adiabatic pla-te unit, ~ 10~5~7 compared ~o that when no adiabatic plate unit i8 employed.As a matter of fact, the temperature rises from 30C to 50C, and it is on account of this temperature rise and.the associated withdrawn heat that it is possible to improve the overall performance of the absorption unit.
Claims (3)
1. An apparatus suitable for use in the absorption in a liquid medium of a gas which evolves heat on absorption, which apparatus comprises a casing which encloses a bundle of tubes and two spaced-apart tube-plates to which the tubes are fixed and through which the tubes extend; at least one conduit for feeding the absorbing liquid medium at a point above the tube bundle; means for distributing the liquid medium in the form of a film in the interior of the tubes; at least one con-duit for introducing the gas to be absorbed into that region of the casing below the tube bundle; at least one conduit in a lower end region of the casing for the withdrawal from the casing of the solution of gas absorbed in liquid medium; at least one conduit in an upper end region of the casing for the withdrawal from the casing of non-absorbed gas; at least one inlet and at least one outlet conduit for a coolant to be passed through that zone defined by the casing, tube-plates and the exterior of the tubes, these inlet and outlet conduits com-municating with that zone; one or more plates arranged in the interior of the casing above the tube bundle; and means for directing influent liquid medium onto the one or more plates.
2. A process for absorbing in a liquid medium a gas which evolves heat on absorption, comprising: directing absorbing liquid medium onto one or more plates provided inside a casing of an apparatus including a bundle of tubes and two spaced-apart tube-plates, introducing gas to be absorbed into a lower end region of the casing, passing coolant through a zone between the tube-plates, withdrawing a solution of gas absorbed in liquid medium from the lower end region of the casing, and withdrawing any non-absorbed gas from an upper end region of the casing.
3. A process according to claim 2, wherein the gas to be absorbed is ammonia, and the liquid medium is water.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT22142/75A IT1034959B (en) | 1975-04-09 | 1975-04-09 | EQUIPMENT SUITABLE FOR CONDUCTING THE ABSORPTION OF GASEOUS SUBSTANCES THAT DEVELOP HEAT WITH A LIQUID MEDIUM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1071527A true CA1071527A (en) | 1980-02-12 |
Family
ID=11192106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA249,667A Expired CA1071527A (en) | 1975-04-09 | 1976-04-06 | Apparatus and process for use in absorbing in a liquid medium a gas which evolves heat on absorption |
Country Status (33)
| Country | Link |
|---|---|
| JP (1) | JPS6018207B2 (en) |
| AR (1) | AR213406A1 (en) |
| AT (1) | AT363921B (en) |
| AU (1) | AU503903B2 (en) |
| BE (1) | BE840528A (en) |
| BG (1) | BG29565A3 (en) |
| BR (1) | BR7602174A (en) |
| CA (1) | CA1071527A (en) |
| CH (1) | CH609257A5 (en) |
| CS (1) | CS186735B2 (en) |
| DD (1) | DD123724A5 (en) |
| DE (1) | DE2615612B2 (en) |
| DK (1) | DK144852C (en) |
| ES (1) | ES447175A1 (en) |
| FR (1) | FR2306727A1 (en) |
| GB (1) | GB1506126A (en) |
| HU (1) | HU176321B (en) |
| IE (1) | IE43364B1 (en) |
| IL (1) | IL49348A (en) |
| IN (1) | IN144406B (en) |
| IT (1) | IT1034959B (en) |
| LU (1) | LU74713A1 (en) |
| MW (1) | MW1176A1 (en) |
| MY (1) | MY7900228A (en) |
| NL (1) | NL7603817A (en) |
| NO (1) | NO144321C (en) |
| PH (1) | PH19800A (en) |
| PL (1) | PL101474B1 (en) |
| PT (1) | PT64982B (en) |
| SE (1) | SE409447B (en) |
| YU (2) | YU90176A (en) |
| ZA (1) | ZA761919B (en) |
| ZM (1) | ZM4576A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467623A (en) * | 1983-01-06 | 1984-08-28 | The United States Of America As Represented By The United States Department Of Energy | Counterflow absorber for an absorption refrigeration system |
| JP7013825B2 (en) | 2017-12-04 | 2022-02-01 | 住友ゴム工業株式会社 | Rubber composition for tire outer layer and pneumatic tire |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3344585A (en) * | 1967-05-12 | 1967-10-03 | Eugene G Hollowell | Method for recovering ammonia from gaseous mixture |
-
1975
- 1975-04-09 IT IT22142/75A patent/IT1034959B/en active
-
1976
- 1976-03-30 ZA ZA761919A patent/ZA761919B/en unknown
- 1976-03-30 DK DK145176A patent/DK144852C/en not_active IP Right Cessation
- 1976-04-02 MW MW11/76A patent/MW1176A1/en unknown
- 1976-04-02 AU AU12602/76A patent/AU503903B2/en not_active Expired
- 1976-04-05 IL IL49348A patent/IL49348A/en unknown
- 1976-04-05 ZM ZM45/76A patent/ZM4576A1/en unknown
- 1976-04-05 CH CH423576A patent/CH609257A5/en not_active IP Right Cessation
- 1976-04-06 GB GB13787/76A patent/GB1506126A/en not_active Expired
- 1976-04-06 CA CA249,667A patent/CA1071527A/en not_active Expired
- 1976-04-07 PT PT64982A patent/PT64982B/en unknown
- 1976-04-07 NO NO761188A patent/NO144321C/en unknown
- 1976-04-07 LU LU74713A patent/LU74713A1/xx unknown
- 1976-04-07 FR FR7610090A patent/FR2306727A1/en active Granted
- 1976-04-07 PH PH18305A patent/PH19800A/en unknown
- 1976-04-07 DD DD192246A patent/DD123724A5/xx unknown
- 1976-04-08 CS CS7600002333A patent/CS186735B2/en unknown
- 1976-04-08 YU YU00901/76A patent/YU90176A/en unknown
- 1976-04-08 HU HU76SA2915A patent/HU176321B/en unknown
- 1976-04-08 YU YU904/76A patent/YU40453B/en unknown
- 1976-04-08 BE BE165964A patent/BE840528A/en not_active IP Right Cessation
- 1976-04-08 AT AT0258176A patent/AT363921B/en not_active IP Right Cessation
- 1976-04-08 SE SE7604137A patent/SE409447B/en not_active IP Right Cessation
- 1976-04-08 IE IE736/76A patent/IE43364B1/en unknown
- 1976-04-08 BR BR7602174A patent/BR7602174A/en unknown
- 1976-04-09 IN IN623/CAL/1976A patent/IN144406B/en unknown
- 1976-04-09 NL NL7603817A patent/NL7603817A/en active Search and Examination
- 1976-04-09 ES ES447175A patent/ES447175A1/en not_active Expired
- 1976-04-09 JP JP51039419A patent/JPS6018207B2/en not_active Expired
- 1976-04-09 DE DE19762615612 patent/DE2615612B2/en not_active Withdrawn
- 1976-04-09 BG BG7632861A patent/BG29565A3/en unknown
- 1976-04-09 AR AR262844A patent/AR213406A1/en active
- 1976-04-09 PL PL1976188627A patent/PL101474B1/en unknown
-
1979
- 1979-12-30 MY MY228/79A patent/MY7900228A/en unknown
Also Published As
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3841058A (en) | Method for the purification of natural gas | |
| CA1308740C (en) | Process for producing methanol | |
| US4486270A (en) | Apparatus for the removal of ammonium carbamate from a urea-synthesis solution | |
| US4057403A (en) | Gas treating process | |
| CA1071527A (en) | Apparatus and process for use in absorbing in a liquid medium a gas which evolves heat on absorption | |
| EP0067013B1 (en) | Process for removal of cyclic urea reaction product from amine gas - treating solution | |
| Okuhara et al. | Evidence for “pseudo-liquid phase” in the dehydration of isopropanol over H3PW12O40 | |
| CN211366951U (en) | Synthesis reactor of iodine pentafluoride | |
| JPH0511045B2 (en) | ||
| US3017426A (en) | Removal of phenolic inhibitors from alkenyl monomers | |
| US2325576A (en) | Recovery of olefin oxides | |
| US3541131A (en) | Ion exchange recovery of oxazole from acrylonitrile compositions | |
| US3087533A (en) | Drying apparatus and method | |
| US3037844A (en) | Method of separating and recovering carbon dioxide from gaseous mixtures | |
| GB1193221A (en) | Process and Apparatus for Drying Solutions | |
| JP3529113B2 (en) | Method for removing impurities from hydrazine hydrate | |
| CN114042433A (en) | Quaternary ammonium base type functional silica gel material and application thereof in water purification | |
| US2377781A (en) | Gas and liquid contact apparatus | |
| US2656251A (en) | Process for the manufacture of hcn | |
| US2884999A (en) | Process for reducing moisture content of ammonium nitrate | |
| US4085151A (en) | Butynediol production | |
| US3411866A (en) | Method and apparatus for maintaining proper reactivation of absorbent solution | |
| JPS61197415A (en) | Purification of dichlorosilane | |
| US5180566A (en) | Process for the removal of ammonia from gases | |
| JPS54103778A (en) | Air separator pretreatment and apparatus therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |