Claims
- 1. A process for preparing carbonic diester comprising the formation of carbonic diester by the vapor phase catalytic reaction of an alkyl nitrite and carbon monoxide in the presence of a solid catalyst, wherein platinum group metal ion in the solid catalyst is exchanged on an ion exchange zeolite carrier.
- 2. The process according to claim 1, wherein the molar ratio of said nitrite to carbon monoxide is 2:1 or more.
- 3. The process according to claim 1, wherein said catalyst comprises the platinum group metal ion and at least one ion of a metal selected from the group consisting of copper, iron, tin, nickel, cobalt, cerium, silver and manganese carried on said zeolite.
- 4. The process according to claim 1, wherein said catalyst comprises the platinum group metal ion and at least one ion of a metal selected from the group consisting of an alkaline metal and an alkaline earth metal exchanged on an ion exchange zeolite.
- 5. The process according to claim 1, wherein the atomic ratio of Si to Al of said zeolite is 0.5 to 10.
- 6. The process according to claim 1, wherein said reaction is carried out in the presence of 0.01 to 5 mol % of water against the total amount of a raw material gas supplied to the reaction system.
- 7. The process according to claim 1, , wherein the molar ratio of said nitrite to carbon monoxide is 2:1 to 30:1.
- 8. The process according to claim 7, wherein the molar ratio of said nitrite to carbon monoxide is 2:1 to 20:1.
- 9. The process according to claim 8, wherein the molar ratio of said nitrite to carbon monoxide is 3:1 to 10:1.
- 10. The process according to claim 6, wherein the ratio of water is 0.1 to 3 mol %.
- 11. The process according to claim 4, wherein said reaction is carried out in the presence of 0.01 to 5 mol % of water and 0.03 to 30 mol % of a lower aliphatic alcohol against the total amount of the raw material gas supplied to the reaction system.
- 12. The process according to claim 1, wherein a space velocity of the raw material gas containing carbon monoxide and a nitrite to be reacted is in the range of 500 to 20000 h.sup.-1.
- 13. The process according to claim 1, wherein said reaction is carried out at 0.degree. to 200.degree. C. under an atmospheric pressure.
- 14. The process according to claim 1, wherein a carried amount of a platinum group metal ion is 0.1 to 10% by weight based on the zeolite carrier.
- 15. The process according to claim 3, wherein a carried amount of at least one ion of a metal is 1 to 50 gram atomic equivalent based on the amount of the platinum group metal ion.
- 16. The process according to claim 1, wherein said ion exchange type zeolite is at least one selected from the group consisting of a synthetic zeolite such as X type zeolite, Y type zeolite, mordenite and silicalite and a natural zeolite.
- 17. The process according to claim 1, wherein said catalyst has weak acidity shown by an acidic strength or an acidic amount.
- 18. The process according to claim 1, wherein the acidic strength of the catalyst is a desorption temperature below 360.degree. C. according to an ammonia-TPD method.
- 19. The process according to claim 1, wherein the acidic amount determined by an ammonia-TPD method is 20 or less in the case where an acidic amount of an HY type zeolite is 100.
Priority Claims (5)
Number |
Date |
Country |
Kind |
3-57695 |
Mar 1991 |
JPX |
|
4-10867 |
Jan 1992 |
JPX |
|
4-097506 |
Mar 1992 |
JPX |
|
4-210601 |
Jun 1992 |
JPX |
|
4-245411 |
Jul 1992 |
JPX |
|
Parent Case Info
This application is continuation-in-part of U.S. patent application Ser. No. 07/841,009, filed Feb. 25, 1992 now abandoned in the names of Keigo NISHIHIRA, Shuji TANAKA, Kunioki KODAMA, and Takayoshi KANEKO.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4384133 |
Miyazaki et al. |
May 1983 |
|
5162563 |
Nishihira et al. |
Nov 1992 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
425197 |
May 1991 |
EPX |
Non-Patent Literature Citations (2)
Entry |
Derwent Publication No. 85-267457, Database WPIL, corresponding to Japanese Patent Application No. 60-181051 (Toa Nenryo Kogio KK), 1985. |
European Search Report, EP 92 10 3454, dated Dec. 18, 1992. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
841009 |
Feb 1992 |
|