Claims
- 1. In a process for removing NH.sub.3 in a pre-stage gas for a Claus reaction in a sulfur-recovery process by a Claus unit, the improvement wherein the pre-stage gas containing 0.5% or more by volume of SO.sub.2 and H.sub.2 S and 100 to 5,000 ppm of NH.sub.3 is contacted with a catalyst consisting essentially of titanium at a temperature of 500.degree. to 800.degree. C.
- 2. The process of claim 1 in which the volume of SO.sub.2 is 0.5 to 15% and the volume of H.sub.2 S is 4.8-5.0%.
- 3. The process of claim 1, wherein the pre-stage gas for the Claus reaction is obtained by reducing a part of an SO.sub.2 -containing gas in a reducing furnace by a reducing agent.
- 4. The process of claim 3, wherein the reducing agent is a carbonaceous material.
- 5. The process of claim 1, wherein the titanium-type catalyst contains at least 60% by weight of TiO.sub.2.
- 6. The process of claim 1, wherein the titanium-type catalyst is prepared so as to be suited for the Claus reaction.
- 7. The process of claim 1, wherein the titanium-type catalyst is prepared by hydrolysing a titanium ore or titanium tetrachloride to form titanium oxide, mixing the titanium oxide with water and a binder, extruding and forming the mixture, drying and calcining.
- 8. The process of claim 1, wherein the removing of NH.sub.3 is carried out at a temperature of 500.degree. to 800.degree. C. and a space velocity of 500 to 4000 hr.sup.-1.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-179449 |
Aug 1984 |
JPX |
|
Parent Case Info
This application is a continuation-in-part of now abandoned application Ser. No. 767,970, filed Aug. 21, 1985.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
2887363 |
Viles |
May 1959 |
|
4081510 |
Kato et al. |
Mar 1978 |
|
4117101 |
Fechner et al. |
Sep 1978 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
2646753 |
Apr 1977 |
DEX |
0023566 |
Feb 1977 |
JPX |
0058067 |
May 1977 |
JPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
767970 |
Aug 1985 |
|