DE971061C - Process for cleaning the exhaust air from viscose plants - Google Patents
Process for cleaning the exhaust air from viscose plantsInfo
- Publication number
- DE971061C DE971061C DEP5289A DEP0005289A DE971061C DE 971061 C DE971061 C DE 971061C DE P5289 A DEP5289 A DE P5289A DE P0005289 A DEP0005289 A DE P0005289A DE 971061 C DE971061 C DE 971061C
- Authority
- DE
- Germany
- Prior art keywords
- gases
- cleaning
- spinning
- hydrogen sulfide
- carbon disulfide
- 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
- 238000004140 cleaning Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 9
- 229920000297 Rayon Polymers 0.000 title claims description 7
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 claims description 63
- 239000007789 gas Substances 0.000 claims description 30
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 19
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 17
- 238000009987 spinning Methods 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 229920002955 Art silk Polymers 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 claims 1
- 239000002964 rayon Substances 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- QGJOPFRUJISHPQ-NJFSPNSNSA-N carbon disulfide-14c Chemical compound S=[14C]=S QGJOPFRUJISHPQ-NJFSPNSNSA-N 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/58—Chisel-type inserts
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
- B01D53/523—Mixtures of hydrogen sulfide and sulfur oxides
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
- D01F13/02—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of cellulose, cellulose derivatives or proteins
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Fluid Mechanics (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Textile Engineering (AREA)
- Treating Waste Gases (AREA)
- Artificial Filaments (AREA)
- Gas Separation By Absorption (AREA)
Description
Im Patent 950 191 ist ein Verfahren zum Reinigen der Abluft von Viskosefabriken, insbesondere der an den Spinnstellen und aus dem Spinnsaal abgesaugten Luft, mittels lose geschütteter eisenoxydhydrathaltiger Massen beschrieben, wonach die Abluft mit einer Gasströmungsgeschwindigkeit von mindestens 1,5 cm in der Sekunde durch die Reinigungsmassen hindurchgeleitet wird.In patent 950,191 there is a method of cleaning the exhaust air from viscose factories, especially that extracted from the spinning stations and from the spinning room Air, described by means of loosely poured iron oxide hydrate containing masses, after which the exhaust air with a gas flow rate of at least 1.5 cm per second through the cleaning compounds is passed through.
Bei dem beschriebenen Verfahren ist zwar eine praktisch vollständige Beseitigung des Schwefelwasserstoffes aus den Abgasen gesichert, indessen gelingt es mit Hilfe der angegebenen Mittel nicht, den gleichfalls in den Abgasen enthaltenen Schwefelkohlenstoff wiederzugewinnen. Die Rückgewinnung des Schwefelkohlenstoffes ist technisch wirtschaftlich nur mit Hilfe der bekannten Adsorptionsverfahren, beispielsweise unter Verwendung von Silikagel, Adsorptionskohle od. dgl., möglich. Es ist jedoch in der Praxis undurchführbar, die mehrere tausend Kubikmeter betragende Abluftmenge durch entsprechende Adsorptionsanlagen hindurchzuleiten, da die Adsorption eine gewisse Zeit erfordert und für die Bewältigung der Abgasmenge Adsorptionsanlagen geschaffen werden müßten, die etwa den Umfang der ganzen Viskosefabrik erreichen würden. Außerdem werden die Adsorptionsmittel leicht durch Spuren von Schwefelwasserstoff, der noch in den Abgasen enthalten ist, ver-In the process described, there is practically complete elimination of the hydrogen sulfide secured from the exhaust gases, but it is not possible with the help of the specified means, to recover the carbon disulfide also contained in the exhaust gases. The recovery the carbon disulfide is technically economical only with the help of the known adsorption processes, For example, using silica gel, adsorption carbon or the like. Possible. In practice, however, it is impracticable to deal with the amount of exhaust air, which amounts to several thousand cubic meters to pass through appropriate adsorption systems, since the adsorption a certain Requires time and adsorption systems would have to be created to cope with the amount of exhaust gas, which would be about the size of the entire viscose factory. In addition, the adsorbents easily caused by traces of hydrogen sulfide, which is still contained in the exhaust gases,
809 675/30809 675/30
giftet und in ihrer Adsorptionswirkung geschwächt. Man hat sich daher bisher damit zufrieden geben müssen, die Schwefelkohlenstoffmengen, die in den gesamten Abgasmengen nur in sehr geringen Konzentrationen enthalten sind, so daß sie keine Geruchsbelästigung verursachen, verloren zu geben. Trotzdem handelt es sich im ganzen gesehen um beträchtliche Mengen, so daß der Schwefelkohlenstoffverlust eine erhebliche wirtschaftliche Belastung der Fabrik darstellt.poisonous and weakened in their adsorption effect. So far we have been satisfied with it must, the amounts of carbon disulfide, which in the total amount of exhaust gas only in very low concentrations are included so that they do not cause odor nuisance, lost to give. Nevertheless, on the whole, the amounts involved are considerable, so that the carbon disulfide loss puts a significant economic burden on the factory.
Wie eingehende Untersuchungen gezeigt haben, wird die Hauptmenge des Schwefelkohlenstoffes nicht im Spinnbad entbunden, obwohl dieses bei der in der Viskoseindustrie angewandten hohen Temperatur, die etwa in der Nähe des Siedepunktes des Schwefelkohlenstoffes liegt, zunächst am wahrscheinlichsten ist, vielmehr wird der Schwefelkohlenstoff in dem Moment der Entstehung des Fadens im wesentlichen von diesem infolge seiner hochkolloidalen Struktur adsorbiert und gelangt mit dem Faden in die Nachbehandlung. Erst hier, also beim Auswaschen des Fadens, bei Temperaturen, die in der Gegend des Siedepunktes des Wassers liegen, findet die Schwefelkohlenstoffentbindung statt, so daß sich die Hauptmenge des entweichenden Schwefelkohlenstoffes in den von der Nachbehandlung des Fadens herrührenden Gasen befindet.As detailed studies have shown, the bulk of the carbon disulfide is not released in the spinning bath, although this is at the high level used in the viscose industry Temperature, which is roughly close to the boiling point of carbon disulfide, initially at most likely is, rather, the carbon disulfide is at the moment of the formation of the The thread is essentially adsorbed by this due to its highly colloidal structure and arrives with the thread in the aftertreatment. Only here, i.e. when washing out the thread, at temperatures which are in the region of the boiling point of water, find the release of carbon disulfide instead, so that the majority of the escaping carbon disulfide in the Post-treatment of the thread originating gases is located.
Das Wesen der Erfindung besteht nun darin, die an den Spinnstellen abgesaugte Abluft von den bei der Nachbehandlung des Fadens entstehenden Gasen und Dämpfen zu trennen und jeden Anteil für sich der in dem Hauptpatent beschriebenen Schwefelwasserstoffentfernung zu unterwerfen. Die von den Spinnstellen entweichenden Gase, die im übrigen die Hauptmenge der gesamten entstehenden Abgase darstellen, können ohne weiteres in die Atmosphäre abgelassen werden, da sie keine wesentlichen Mengen an Schwefelkohlenstoff enthalten. Die von der Nachbehandlung herrührenden Gase dagegen werden im Anschluß an die Entschwefelung nunmehr durch eine Schwefelkohlenstoff-Wiedergewinnungsanlage hindurchgeschickt, wobei praktisch die Gesamtmenge des bei der Viskosefasergewinnung überhaupt entstehenden Schwefelkohlenstoffes wiedergewonnen wird. Da die Abgase der Nachbehandlung volumenmäßig verhältnismäßig gering sind und die Schwefelkohlenstoffkonzentration in diesen Gasen verhältnismäßig hoch liegt, läßt sich die Adsorption mit verhältnismäßig kleinen Anlagen praktisch vollständig durchführen.The essence of the invention consists in the exhaust air sucked off at the spinning positions from the the after-treatment of the thread to separate gases and vapors and each part for itself subject to the removal of hydrogen sulfide described in the main patent. The ones from the Spinning positions escaping gases, which in the rest of the main amount of the total resulting exhaust gases can be readily released into the atmosphere as they do not contain significant amounts contain carbon disulfide. On the other hand, the gases resulting from the aftertreatment are following the desulfurization, now through a carbon disulfide recovery plant sent through, with practically the total amount of the viscose fiber production any carbon disulfide produced is recovered. As the exhaust after-treatment are relatively low in volume and the carbon disulfide concentration in these Gases is relatively high, the adsorption can be done with relatively small systems practically complete.
Wie bereits erwähnt, ist Voraussetzung für eine möglichst rasche und vollständige Schwefelkohlenstoffgewinnung die vorherige Befreiung der Gase von Schwefelwasserstoff. Aus diesem Grunde werden gemäß einer bevorzugten Ausführungsform der Erfindung die zur Schwefelwasser stoff beseitigung dienenden eisenoxydhydrathaltigen Massen zunächst in frischem, unverbrauchtem Zustande zur Entschwefelung der Nachbehandlungsabgase benutzt. Dabei werden die Mengen der Schwefelwasserstoffbeseitigungsmassen zweckmäßig so gewählt, daß sie, nachdem sie eine gewisse Zeit zur Schwefelwasserstoffbeseitigung aus den Nachbehandlungsgasen gedient haben, ohne weiteres durch entsprechende Umschaltung zur Schwefelwasserstoffentfernung aus den Spinnereiabgasen verwendet werden können. Da die Menge des aus der Spinnerei entweichenden Schwefelwasserstoffes annähernd hundertmal so groß ist wie die Menge des in der Nachbehandlung noch entbundenen Schwefelwasserstoffes, wird also bei der Schwefelwasserstoffbeseitigung aus den Nachbehandlungsabgasen bei dieser Arbeitsweise stets mit einem außerordentlichen Überschuß an Entschweflungsmitteln gearbeitet, der in jedem Fall genügt, um auch die letzten Spuren des Schwefelwasserstoffes aus den Nachbehandlungsabgasen zu entfernen, und es unmöglich macht, daß sich der Schwefel in den eisenoxydhydrathaltigen Massen bis zu einem Betrag anreichert, der die Wirksamkeit dieser Massen irgendwie nennenswert beeinflußt. Es gelangt also auf diese Weise stets eine vollständig von Schwefelwasserstoff befreite Abgasmenge in die Schwefelkohlenstoffadsorptionsanlage, wobei noch zu berücksichtigen ist, daß auch die in der Nachbehandlung entstehende absolute Abgasmenge nur einen Bruchteil der in der Spinnerei entstehenden Abgase darstellt.As already mentioned, this is a prerequisite for the fastest and most complete production of carbon disulfide the prior removal of hydrogen sulfide from the gases. Because of this, will According to a preferred embodiment of the invention, the elimination of hydrogen sulfide Serving masses containing iron oxide hydrate initially in a fresh, unused state Desulfurization of the aftertreatment gases used. In doing so, the amounts of hydrogen sulfide removal masses expediently chosen so that after they have had a certain time to remove hydrogen sulfide from the aftertreatment gases have served, without further ado by switching over to the removal of hydrogen sulfide from the spinning exhaust gases can be used. Since the amount of hydrogen sulfide escaping from the spinning mill is approximate is a hundred times as large as the amount of hydrogen sulfide still released in the aftertreatment, is thus involved in the removal of hydrogen sulfide from the aftertreatment exhaust gases this way of working always worked with an extraordinary excess of desulphurizing agents, which in any case is sufficient to remove even the last traces of hydrogen sulfide from the To remove aftertreatment fumes, and it makes it impossible that the sulfur in the iron oxide hydrate containing Enriched masses to an amount that somehow appreciably affects the effectiveness of these masses. So it gets there In this way always a completely freed of hydrogen sulfide amount of exhaust gas into the carbon disulfide adsorption system, It should also be taken into account that the absolute amount of exhaust gas produced in the aftertreatment is only one Represents a fraction of the exhaust gases produced in the spinning mill.
Zur Adsorption des Schwefelkohlenstoffes können verschiedene an sich bekannte Mittel und Einrichtungen Verwendung finden. In der Praxis hat sich am besten die Adsorption des Schwefelkohlenstoffes mit Adsorptivkohle bewährt, aus der der Schwefelkohlenstoff in an sich bekannter Weise durch Ausdampfen mit heißem Wasser oder überhitztem Wasserdampf und nachfolgender Destillation leicht und nahezu restlos gewonnen werden kann.Various means and devices known per se can be used for adsorbing the carbon disulfide Find use. In practice, the adsorption of carbon disulfide has proven to be the best Proven with adsorptive carbon, from which the carbon disulfide in a manner known per se by evaporation with hot water or superheated steam and subsequent distillation can be obtained easily and almost completely.
Durch die beschriebene Arbeitsweise gelingt es einerseits, den Schwefelkohlenstoff in einer Ausbeute von etwa 80 bis 90% — gerechnet auf die Gesamtmenge des entstehenden Schwefelkohlenstoffes — wiederzugewinnen, wobei lediglich die geringen mit den Abgasen der Spinnstellen entweichenden Mengen verloren gegeben werden müssen; andererseits wird auch die Reinigung der gesamten Abluft von Schwefelwasserstoff erheblich wirtschaftlicher gestaltet, weil die zur Vorbehandlung der Nachbehandlungsgase in der sogenannten Feinentschweflung verwandten Schwefelwasserstoffreinigermassen bei der nachfolgenden Verwendung zur Reinigung der Spinnstellenabgase in der Grobentschwefelung bis zu ihrer höchsten Leistungsfähigkeit ausgenutzt werden können. Dabei wird die Umschaltung der Reinigermassen von der Feinentschwefelung zur Grobentschwefelung in der Hauptsache durch den Bedarf der Grobentschwefelungsstation an neuen Reinigermassen bzw. durch die Erschöpfung der alten Reinigermassen in diesem Verfahrensgange bestimmt, während in der Feinentschwefelung der aus dem Schwefelwasserstoff gebildete Schwefel sich niemals zu einem nennenswerten Betrage anreichern kann, so daß hier eine restlose Entschwefelung stets gesichert ist. Durch die Vorschaltung der Schwefelwasserstoff-The procedure described makes it possible, on the one hand, to obtain the carbon disulfide in one yield from about 80 to 90% - calculated on the total amount of carbon disulfide produced - to recover, with only the small ones escaping with the exhaust gases from the spinning stations Quantities must be given lost; the other hand is also cleaning the whole Exhaust air made of hydrogen sulfide is much more economical because it is used for pretreatment of the aftertreatment gases in the so-called fine desulphurisation related hydrogen sulphide cleaning agents in the subsequent use for cleaning the spinning position exhaust gases in the coarse desulphurisation up to their maximum efficiency can be exploited. The switchover of the cleaning compounds from fine desulphurisation to coarse desulphurisation in the Mainly due to the need of the coarse desulphurisation station for new cleaning compounds or by the exhaustion of the old detergent compounds is determined in this process cycle, while in the Fine desulphurisation of the sulfur formed from the hydrogen sulphide never becomes a significant one Amount can enrich, so that a complete desulfurization is always ensured here. Through the upstream connection of the hydrogen sulfide
reinigermassen vor der Schwefelkohlenstoffadsorption werden außerdem auch etwaige von den Gasen mitgerissene Säuren- und Salzspuren restlos zurückgehalten, welche eine Schädigung der zur Schwefelkohlenstoffadsorption dienenden Massen bewirken könnten.The cleaning agent before the carbon disulfide adsorption also removes any of the gases entrained acid and salt traces are completely retained, which can damage the Could cause carbon disulfide adsorption masses.
Claims (3)
Französische Patentschrift Nr. 856 308;
»Kunstseide und Zellwolle«, 1949, S. 114;
»Das Gas- und Wasserfach«, 1939, S. 681, 687; B r a t ζ 1 e r, »Absorption von Gasen und Dämpfen«, 1944, S. 135/136.Considered publications:
French Patent No. 856 308;
"Artificial silk and rayon", 1949, p. 114;
"Das Gas- und Wasserfach", 1939, pp. 681, 687; B rat ζ 1 er, "Absorption of gases and vapors", 1944, pp. 135/136.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP7825A DE1029347B (en) | 1952-06-13 | 1952-06-13 | Process for cleaning the exhaust air from viscose factories |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE971061C true DE971061C (en) | 1958-12-04 |
Family
ID=7361391
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP1844A Expired DE971181C (en) | 1950-06-13 | 1950-06-13 | Process for cleaning the exhaust air from viscose plants |
| DEP5289A Expired DE971061C (en) | 1952-06-13 | 1951-03-25 | Process for cleaning the exhaust air from viscose plants |
| DEP7825A Pending DE1029347B (en) | 1950-06-13 | 1952-06-13 | Process for cleaning the exhaust air from viscose factories |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP1844A Expired DE971181C (en) | 1950-06-13 | 1950-06-13 | Process for cleaning the exhaust air from viscose plants |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP7825A Pending DE1029347B (en) | 1950-06-13 | 1952-06-13 | Process for cleaning the exhaust air from viscose factories |
Country Status (6)
| Country | Link |
|---|---|
| BE (3) | BE498368A (en) |
| CH (2) | CH287173A (en) |
| DE (3) | DE971181C (en) |
| FR (2) | FR1026816A (en) |
| GB (2) | GB676736A (en) |
| NL (1) | NL73615C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL278103A (en) * | 1955-03-24 | |||
| DE1059378B (en) * | 1956-10-26 | 1959-06-18 | Siemens Ag | Rotary bit with hard metal inserts in the blades |
| DE2152127C3 (en) * | 1971-10-20 | 1982-05-06 | Meißner, Joachim, 2000 Hamburg | Rock drill |
| FR2558891B1 (en) * | 1984-02-01 | 1986-11-07 | Charbonnages De France | ROTARY DRILLING SIZE ASSISTED BY HIGH PRESSURE JETS |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR856308A (en) * | 1939-02-24 | 1940-06-11 | Carbonisation Charbons Actifs | Improvements in viscose manufacturing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE262979C (en) * | ||||
| GB519856A (en) * | 1938-10-04 | 1940-04-08 | Courtaulds Ltd | Improvements in and relating to the controlled movement of liquids |
-
1950
- 1950-06-13 DE DEP1844A patent/DE971181C/en not_active Expired
- 1950-08-07 CH CH287173D patent/CH287173A/en unknown
- 1950-08-08 NL NL155288A patent/NL73615C/xx active
- 1950-08-18 FR FR1026816D patent/FR1026816A/en not_active Expired
- 1950-09-27 BE BE498368D patent/BE498368A/xx unknown
- 1950-10-16 GB GB25192/50A patent/GB676736A/en not_active Expired
-
1951
- 1951-03-25 DE DEP5289A patent/DE971061C/en not_active Expired
-
1952
- 1952-06-13 DE DEP7825A patent/DE1029347B/en active Pending
-
1953
- 1953-05-11 CH CH316324D patent/CH316324A/en unknown
- 1953-05-12 BE BE519903D patent/BE519903A/xx unknown
- 1953-05-12 BE BE519905D patent/BE519905A/xx unknown
- 1953-05-27 FR FR64969D patent/FR64969E/en not_active Expired
- 1953-05-29 GB GB15062/53A patent/GB725749A/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR856308A (en) * | 1939-02-24 | 1940-06-11 | Carbonisation Charbons Actifs | Improvements in viscose manufacturing |
Also Published As
| Publication number | Publication date |
|---|---|
| FR64969E (en) | 1955-12-15 |
| BE519903A (en) | 1955-05-27 |
| GB725749A (en) | 1955-03-09 |
| DE971181C (en) | 1958-12-24 |
| DE1029347B (en) | 1958-05-08 |
| CH316324A (en) | 1956-09-30 |
| BE498368A (en) | 1951-01-15 |
| GB676736A (en) | 1952-07-30 |
| CH287173A (en) | 1952-11-30 |
| BE519905A (en) | 1955-05-27 |
| FR1026816A (en) | 1953-05-05 |
| NL73615C (en) | 1953-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
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