JPS61256174A - Method of controlling air separator sampling argon - Google Patents
Method of controlling air separator sampling argonInfo
- Publication number
- JPS61256174A JPS61256174A JP60095402A JP9540285A JPS61256174A JP S61256174 A JPS61256174 A JP S61256174A JP 60095402 A JP60095402 A JP 60095402A JP 9540285 A JP9540285 A JP 9540285A JP S61256174 A JPS61256174 A JP S61256174A
- Authority
- JP
- Japan
- Prior art keywords
- column
- air
- argon
- main
- rectification column
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
- F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
- F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04642—Recovering noble gases from air
- F25J3/04648—Recovering noble gases from air argon
- F25J3/04654—Producing crude argon in a crude argon column
- F25J3/04666—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system
- F25J3/04672—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser
- F25J3/04678—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser cooled by oxygen enriched liquid from high pressure column bottoms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
- F25J3/048—Argon recovery
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2245/00—Processes or apparatus involving steps for recycling of process streams
- F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の利月分野〕
本発明は、空気の液化深冷分離により酸素、窒素と同時
１こアルゴンを採取する空気分離装置における主精留塔
の制御方法に関するものである。[Detailed Description of the Invention] [Field of the Invention] The present invention relates to a method for controlling a main rectification column in an air separation device that simultaneously extracts oxygen, nitrogen, and argon through liquefaction cryogenic separation of air. be.
従来のアルゴンを採取する空気分１１＋！＊置は、特開
昭５４−１１６３８５号公報等に開示さｎている。この
種装置では、アルゴンを採取するために粗アルゴン塔を
設置しているが、粗アルゴン塔を安定する条件として徂
アルゴン塔と密接な関係にある主精留塔をまず安定させ
る必要がある。このため製品酸素址やアルゴンの抜出量
に応じて膨張タービンから主精留塔への空気供給量を調
整するなどの方法がとらｎでいた。The air content of conventional argon sampling is 11+! *The location is disclosed in Japanese Unexamined Patent Publication No. 116385/1985. In this type of apparatus, a crude argon column is installed to collect argon, but in order to stabilize the crude argon column, it is first necessary to stabilize the main rectification column, which is closely related to the argon column. For this reason, methods such as adjusting the amount of air supplied from the expansion turbine to the main rectification column depending on the amount of product oxygen and the amount of argon extracted have been available.
しかし、この方法だけでは、主精留塔および粗アルゴン
塔の調整時、粗アルゴン塔の差圧、主精留塔下塔から上
塔へ吹込まｎ、る液体空気の酸素濃圧、岐着器の切替時
の還流液量の変動等の影響な受けるため主精留塔上塔下
部での酸素ガス量、純度によって見かけ上安定している
場合でも粗アルゴン塔フィード段が窒素リッチゾーンに
なっていたり、又逆に、酸素リッチゾーンになっていた
りして、租アルゴン塔の不安定運転やアルゴン回収率の
低下を招く恐ｊ、がある。従って、アルゴン採取運転は
操作がむずかしく、調整に熟練を要していた。However, when adjusting the main rectification column and the crude argon column, it is difficult to adjust the pressure difference between the crude argon columns, the oxygen concentration pressure of the liquid air blown from the lower column of the main rectification column to the upper column, and the junction Due to the influence of fluctuations in the amount of reflux liquid when switching between Or, conversely, it may become an oxygen-rich zone, leading to unstable operation of the argon tower and a decrease in the argon recovery rate. Therefore, the argon sampling operation was difficult to operate and required skill to adjust.
本発明の目的は、主精留塔内のガス組成の安定をはかり
、アルゴン採取運転を安定して行なうことのできるアル
ゴンを採取する空気分離装置の制御方法を提供すること
である。An object of the present invention is to provide a method of controlling an air separation apparatus for extracting argon, which stabilizes the gas composition in the main rectification column and allows stable argon sampling operation.
未発明の要点は、粗アルゴン塔へのフィードガス組成を
決定する要因となる主精留塔の液体空気吹込段と粗アル
ゴン塔フィード段との間および主凝縮器部に精留塔の飽
和温度を管理するための温度検出部を設け、この飽和温
度の温度差がフィード段でのガス組成の最適温度を保つ
ように温度差調節計により膨張タービン出口のバイパス
弁を自動的に調整する。こｎｈこより、膨張タービンか
ら主精留塔へ供給さｊる空気量を自動的に調整し。The uninvented key point is that the saturation temperature of the rectifying column between the liquid air blowing stage of the main rectifying column and the crude argon column feed stage and the main condenser section is a factor that determines the feed gas composition to the crude argon column. A temperature detection unit is provided to manage the temperature difference, and a temperature difference controller automatically adjusts the bypass valve at the outlet of the expansion turbine so that the temperature difference between the saturation temperatures maintains the optimum temperature for the gas composition in the feed stage. From this, the amount of air supplied from the expansion turbine to the main rectification column is automatically adjusted.
主精留塔内組成を一定にして粗アルゴン塔を安定させる
。The crude argon column is stabilized by keeping the composition in the main rectification column constant.
以下、本発明の一実施例を第１図により説明する。′Ｍ
１図において、原料となる空気は空気熱交１にて主精留
塔上塔３の分離ガスである戻りガスと熱交換し飽和温度
まで冷却された後、大部分は主精留塔下塔２ｃ吹込まｎ
、下塔で粗精留して液体窒素と純度的４０％０２の液体
空気に分離さルる。一方、空気熱交換器１で冷却された
空気の残りは空気熱交換器の中間から引き抜かれ、膨張
タービン６で断熱膨張することによって外部に仕事をし
装置の全寒冷損失を補っている。膨張タービン６で断熱
膨張した空気は主精留塔上塔３に導入さｎて槓留分離さ
れる。主精留塔下塔２で精留分離さｊ、た液体窒素は還
流液として主精留塔上塔に供給される。残りの液体空気
は過冷却器４を通つて上塔からの分離廃ガスにより過冷
却後、一部は上塔の還流液として供給さｊ、残りは租ア
ルゴン塔５の凝縮器で熱交換しフィードガスを液化させ
る一方、自身はガスとなり上塔に吹込まれて精留分離さ
れる。主精留塔上塔３に一吹込まｊ、た空気。An embodiment of the present invention will be described below with reference to FIG. 'M
In Figure 1, the raw material air exchanges heat with the return gas, which is the separated gas from the upper column 3 of the main rectification column, in an air heat exchanger 1 and is cooled to saturation temperature, after which most of the air is transferred to the lower column 2c of the main rectification column. Infused n
It is crudely rectified in the lower column and separated into liquid nitrogen and liquid air with a purity of 40%. On the other hand, the rest of the air cooled by the air heat exchanger 1 is drawn out from the middle of the air heat exchanger and adiabatically expanded by the expansion turbine 6, thereby doing work to the outside and compensating for the total cooling loss of the device. The air adiabatically expanded by the expansion turbine 6 is introduced into the main rectification column upper column 3, where it is distilled and separated. The liquid nitrogen that has been rectified and separated in the lower column 2 of the main rectification column is supplied to the upper column of the main rectification column as a reflux liquid. The remaining liquid air passes through the supercooler 4 and is supercooled by the separated waste gas from the upper tower, and then part of it is supplied as a reflux liquid to the upper tower, and the rest is heat exchanged in the condenser of the argon tower 5. While the feed gas is liquefied, it itself becomes a gas and is blown into the upper column where it is rectified and separated. Air is blown into the upper column 3 of the main rectification column.
液体空気、液体窒素は精留分離によって上塔上部に低温
ガスの窒素、上塔下部をこ高温ガスの酸素が分離される
。アルゴンはこの窯素、酸素の中間にあってアルゴンリ
ッチとなる上塔中部のフィード段から粗アルゴン塔へ抽
出され精留分離して採取さ１．る。Liquid air and liquid nitrogen are separated by rectification to separate low-temperature gas, nitrogen, in the upper part of the upper column, and high-temperature gas, oxygen, in the lower part of the upper column. Argon is extracted from the feed stage in the middle of the upper column, which is located between the furnace element and oxygen and becomes argon-rich, into the crude argon column, and is collected by rectification and separation.1. Ru.
アルゴンを採取する空気分離装置では、粗アルゴン塔５
をいかに安定運転するかにかかつており。In the air separation device that collects argon, the crude argon column 5
I have always wondered how to drive it stably.
これは主精留塔が整定していることが絶対条件となって
くる。主精留塔上塔３から粗アルゴン塔５へ供給される
フィードガス組成は主精留塔の運転状態の影響を強く受
け、空気吸込段ａから酸素採取部す間での組成の変動を
いかに少なくし安定するかにかかつている。この組成の
変動が、フィードガスの酸素リッチ又は、窯素リッチを
起し、アルゴン回収率の低下、酸素純度の低下皮び粗ア
ルゴン塔５凝縮器能力の低下、粗アルゴン塔５差圧の低
下等アルゴン採取を不可能にするだけでなく主精留塔を
も乱すことがある。このためアルゴン採取の運転では、
主精留塔内の組成変動を押え。The absolute condition for this is that the main rectification column is stabilized. The composition of the feed gas supplied from the upper column 3 of the main rectification column to the crude argon column 5 is strongly influenced by the operating conditions of the main rectification column. It depends on whether it can be reduced and stabilized. This change in composition causes the feed gas to become oxygen-rich or kiln-rich, resulting in a decrease in argon recovery rate, a decrease in oxygen purity, a decrease in crude argon column 5 condenser capacity, and a decrease in the differential pressure in crude argon column 5. Not only will it make equiargon extraction impossible, but it can also disturb the main rectifier. For this reason, during argon sampling operation,
Prevents compositional fluctuations within the main rectification column.
最適条件にするのかこ時間がかかるとともに熟練を要し
ていた。It takes a lot of time to set the optimum conditions and requires skill.
この実施例ではこの解決策として、粗アルゴン塔５への
フィードガスの組成が決まる主精留塔上塔３の中間段（
空気吹込段ａとフィード段の間）と、主凝縮器部（酸素
採取部）ｂとに温度検出端９１．９２を設け、夫々の温
度を温度検出器】０１．１０２で検出している。そして
、これら２点の温度差を予め定めた一定値に制御するた
め温度差調節計１１０を設け、膨張タービン出口のバイ
パス弁８０を自動的に調整する。このため、常にフィー
ドガス組成が一定になるよう膨張タービンから上塔に吹
込まｎる空気量が自動的に調整されることになり、主精
留塔内組成すなわちフィードガス組成の安定がはかれ運
転管理が容易になる。In this example, as a solution to this problem, the intermediate stage (
Temperature detection terminals 91 and 92 are provided between the air blowing stage a and the feed stage) and the main condenser section (oxygen extraction section) b, and the respective temperatures are detected by temperature detectors 01 and 102. A temperature difference controller 110 is provided to control the temperature difference between these two points to a predetermined constant value, and a bypass valve 80 at the outlet of the expansion turbine is automatically adjusted. Therefore, the amount of air blown into the upper column from the expansion turbine is automatically adjusted so that the feed gas composition is always constant, and the composition in the main rectification column, that is, the feed gas composition, is stabilized. Operation management becomes easier.
一方、この方法によれば需要変動ｔこよる酸素減置運耘
に対してもアルゴン採取への対応が容易であり、バイパ
ス弁８０からの叙剰空気は、下塔からの液体空気の過冷
却器４ンこおける冷却１こ使用し、又、空気熱交換器】
での掃気ガスとしても使用さ１する。このため寒冷量、
ガス盪とも有効利用でき。On the other hand, according to this method, it is easy to cope with argon sampling even in the case of oxygen reduction operation due to demand fluctuations, and the excess air from the bypass valve 80 is used to supercool the liquid air from the lower tower. Uses 1 cooler in 4 coolers, and air heat exchanger]
It is also used as a scavenging gas. For this reason, the amount of cold,
Can also be used effectively with gas.
プラントの増減量運転に伴なう膨張タービン６の負荷変
動を小さくすることができる。It is possible to reduce load fluctuations of the expansion turbine 6 due to the increase/decrease operation of the plant.
本発明多こよｒば、従来運転操作がむづかしく、熟練を
要していたアルゴン採取の運転が、主精留塔での温度差
制御により空気量を自動的１こ調整されるため塔内の組
成の安定した運転管理ができ、操作が容＆Ｃなった。さ
らに、温度差の設定でフィードガスの最適純度位置が＠
認でき安定したアルゴン回収運転がほからルる。An advantage of the present invention is that the argon extraction operation, which was conventionally difficult to operate and required skill, can be done by automatically adjusting the amount of air within the column by controlling the temperature difference in the main rectification column. Stable operation management of the composition of the product was achieved, and operation became easier. Furthermore, the optimal purity position of the feed gas can be adjusted by setting the temperature difference.
A reliable and stable argon recovery operation is now possible.
第１図は本発明の一実施例を示す系統図である。 FIG. 1 is a system diagram showing one embodiment of the present invention.
Claims (1)
、該主精留塔上塔の液体空気吹込み段と該上塔下部の主
凝縮器との間のフィード段から抜出されたフィードガス
を精留し粗アルゴンを採取する粗アルゴン塔と、原料空
気の一部を断熱膨張させる膨張タービンと、該膨張ター
ビンを出た低温の原料空気を該主精留塔上塔に導入する
ラインと、該主精留塔上塔に導入される低温の原料空気
の量を調節するために該ラインから分岐するバイパスラ
イン途中に設けられたバイパス弁とを有する空気分離装
置を制御する方法において、前記主精留塔上塔の前記液
体空気吹込み段と前記フィード段との間の塔内温度を検
出すると共に、前記主凝縮器部の温度を検出し、該２つ
の温度検出値の差が予め定められた一定値になるように
前記バイパス弁を調節することを特徴とするアルゴンを
採取する空気分離装置の制御方法。1. A main rectification column that takes in raw air and rectifies and separates the air, and a feed stage between the liquid air blowing stage of the upper column of the main rectification column and the main condenser at the bottom of the upper column. a crude argon column that rectifies the raw feed gas and collects crude argon; an expansion turbine that adiabatically expands a part of the feed air; and a low-temperature feed air that exits the expansion turbine to the upper column of the main rectification column. Controls an air separation device having an introduction line and a bypass valve provided in the middle of a bypass line branching from the line in order to adjust the amount of low-temperature raw material air introduced into the main rectification column upper column. In the method, an internal temperature between the liquid air blowing stage and the feed stage of the main rectification column upper column is detected, and the temperature of the main condenser section is detected, and the two temperature detection values are detected. 1. A method of controlling an air separation device for collecting argon, the method comprising: adjusting the bypass valve so that the difference between the two becomes a predetermined constant value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60095402A JPS61256174A (en) | 1985-05-07 | 1985-05-07 | Method of controlling air separator sampling argon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60095402A JPS61256174A (en) | 1985-05-07 | 1985-05-07 | Method of controlling air separator sampling argon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61256174A true JPS61256174A (en) | 1986-11-13 |
| JPH029279B2 JPH029279B2 (en) | 1990-03-01 |
Family
ID=14136668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60095402A Granted JPS61256174A (en) | 1985-05-07 | 1985-05-07 | Method of controlling air separator sampling argon |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61256174A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1363092A1 (en) * | 2002-05-17 | 2003-11-19 | Linde Aktiengesellschaft | Cryogenic air separation process and apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54116385A (en) * | 1978-03-03 | 1979-09-10 | Hitachi Ltd | Total low pressure system air separating method and equipment |
| JPS5774574A (en) * | 1980-10-29 | 1982-05-10 | Hitachi Ltd | Control of air separator for extracting argon |
-
1985
- 1985-05-07 JP JP60095402A patent/JPS61256174A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54116385A (en) * | 1978-03-03 | 1979-09-10 | Hitachi Ltd | Total low pressure system air separating method and equipment |
| JPS5774574A (en) * | 1980-10-29 | 1982-05-10 | Hitachi Ltd | Control of air separator for extracting argon |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1363092A1 (en) * | 2002-05-17 | 2003-11-19 | Linde Aktiengesellschaft | Cryogenic air separation process and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH029279B2 (en) | 1990-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |