AT229276B - Process for cleaning exhaust air from viscose factories - Google Patents
Process for cleaning exhaust air from viscose factoriesInfo
- Publication number
- AT229276B AT229276B AT251862A AT251862A AT229276B AT 229276 B AT229276 B AT 229276B AT 251862 A AT251862 A AT 251862A AT 251862 A AT251862 A AT 251862A AT 229276 B AT229276 B AT 229276B
- Authority
- AT
- Austria
- Prior art keywords
- exhaust air
- cleaning exhaust
- viscose
- factories
- hydroxide suspension
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 8
- 229920000297 Rayon Polymers 0.000 title claims description 3
- 238000004140 cleaning Methods 0.000 title claims description 3
- 239000000725 suspension Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 4
- 229960004887 ferric hydroxide Drugs 0.000 claims description 4
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims 1
- 230000008020 evaporation Effects 0.000 claims 1
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 235000014413 iron hydroxide Nutrition 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Reinigung der Abluft von Viskosefabriken
EMI1.1
30 cm/sec durch die Eisenhydroxydsuspensionen hindurchgeleitet wird, wobei etwa 725 Mol H S/h umgesetzt werden, worauf aus der von H2S befreiten Abluft in bekannter Weise der Schwefelkohlenstoff entfernt wird.
Die Wiedergewinnung des CS, erfolgt zweckmässig durch Adsorption mittels aktiver Kohle.
Durch hohe Spinntemperaturen und durch die heissen Wasserdämpfe, die bei der Absaugung des CS, aus der Heisswasserverstreckungszone der Spinnmaschine mitgeführt werden sowie durch die Kompression der vom H befreiten Abluft vor ihrem Eintritt in die Aktivkohle-Absorber kann die Temperatur dieser Abluft auf über 500 ansteigen. Eine hohe Temperatur verursacht jedoch hohe Verluste von CS,. Man kann zwar die vom H, S befreite Abluft vor dem Eintritt in den Absorber durch Gegenstrom - Wärmeaustauscher kühlen, doch wären hiezu wegen der sehr grossen Abluftmengen und wegen des geringen Temperaturgefälles ausserordentlich grosse Flächen erforderlich.
Erfindungsgemäss ist es möglich, dass man die Ausbeute an CS, wesentlich erhöhen kann, wenn man die zur Entfernung des H2S benutzte Ferrihydroxydsuspension kühlt. Hiedurch wird erreicht, dass die Temperatur der sie verlassenden Abluft niedriger ist.
Zur Ausführung des Verfahrens lässt man zweckmässig einen Teil des Wassers der Suspension in be-
EMI1.2
etwas erhöht wird. Der durch dieses Verfahren erreichte Fortschritt ist an der Erhöhung der Schwefelkohlenstoffausbeuten zu erkennen. Ohne Kühlung der Eisenhydroxydsuspension tritt die Abluft in den CS-Ad- sorber mit 50 Cein und die Ausbeute an CS, ist 45%.
Nach Kühlung der Suspension derart, dass die Eintrittstemperatur 400C ist, steigt die Ausbeute auf, 56to. Eine weitere Senkung der Eintrittstemperatur auf 330C durch eine stärkere Kühlung der Suspension verbessert die Ausbeute auf 61%. Diese Ausbeutezahlen beziehen sich auf die eingesetzte Schwefelkohlenstoffmenge, von der in den Versuchen aus verschiedenen Gründen nur 651o der Rückgewinnungsanlage zugeführt werden konnte. Auf diese Menge bezogen betragen die oben genannten Ausbeutezahlen 69,86 bzw. 94%. In einer grossen Fabrik werden also durch das erfindungsgemässe Verfahren erhebliche Mengen an Schwefelkohlenstoff der Volkswirtschaft zusätzlich erhalten.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for cleaning exhaust air from viscose factories
EMI1.1
30 cm / sec is passed through the iron hydroxide suspensions, about 725 mol H S / h being converted, whereupon the carbon disulfide is removed in a known manner from the exhaust air freed from H2S.
The recovery of the CS is expediently carried out by adsorption using active charcoal.
Due to the high spinning temperatures and the hot water vapors that are carried out of the hot water drawing zone of the spinning machine when the CS is extracted, as well as the compression of the H-freed exhaust air before it enters the activated carbon absorber, the temperature of this exhaust air can rise to over 500. However, a high temperature causes high losses of CS. It is true that the exhaust air freed from H, S can be cooled by countercurrent heat exchangers before entering the absorber, but this would require extremely large areas because of the very large quantities of exhaust air and the low temperature gradient.
According to the invention it is possible that the yield of CS, can be increased significantly if the ferric hydroxide suspension used to remove the H2S is cooled. This means that the temperature of the exhaust air leaving it is lower.
To carry out the process, it is expedient to leave part of the water in the suspension in
EMI1.2
something is increased. The progress achieved by this process can be seen in the increase in carbon disulfide yields. Without cooling the iron hydroxide suspension, the exhaust air enters the CS adsorber with 50 C and the CS yield is 45%.
After cooling the suspension so that the inlet temperature is 400C, the yield increases to 56to. A further lowering of the inlet temperature to 330 ° C. by more intensive cooling of the suspension improves the yield to 61%. These yield figures refer to the amount of carbon disulfide used, of which only 651o could be fed to the recovery plant in the experiments for various reasons. Based on this amount, the above-mentioned yields are 69.86 and 94%, respectively. In a large factory, therefore, considerable amounts of carbon disulfide are additionally obtained from the national economy by the method according to the invention.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE229276T | 1961-05-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT229276B true AT229276B (en) | 1963-09-10 |
Family
ID=29594068
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT195902D AT195902B (en) | 1961-05-05 | 1956-02-23 | Process for cleaning exhaust air from viscose factories |
| AT251862A AT229276B (en) | 1961-05-05 | 1962-03-28 | Process for cleaning exhaust air from viscose factories |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT195902D AT195902B (en) | 1961-05-05 | 1956-02-23 | Process for cleaning exhaust air from viscose factories |
Country Status (1)
| Country | Link |
|---|---|
| AT (2) | AT195902B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1215297B (en) * | 1955-03-24 | 1966-04-28 | Spinnfaser Ag | Recovery of sulfur and carbon disulfide from the HS- and CS-containing exhaust air from viscose processing factories |
-
1956
- 1956-02-23 AT AT195902D patent/AT195902B/en active
-
1962
- 1962-03-28 AT AT251862A patent/AT229276B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| AT195902B (en) | 1958-02-25 |
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