IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0667677
(1976-03-17)
|
| 우선권정보 |
JA-0040660 (1975-04-03) |
|
발명자
/ 주소 |
- Sonobe Hiroshi (Otake JA) Kato Masaaki (Yamaguchi JA) Matsuzawa Hideo (Otake JA) Ishii Hiromichi (Otake JA) Kobayashi Masao (Otake JA)
|
| 출원인 / 주소 |
- Mitsubishi Rayon Co., Ltd. (Tokyo JA 03)
|
| 인용정보 |
피인용 횟수 :
17 인용 특허 :
0 |
초록
▼
The gas phase catalytic oxidation of an unsaturated aldehyde with molecular oxygen at 240°to 390°C to give the corresponding unsaturated carboxylic acid is conducted in the presence of a catalyst represented by the following formula: Pa Mob Asc Xd Ye Zf Og WHEREIN A, B, C, D, E, F AND G REPRESENT TH
The gas phase catalytic oxidation of an unsaturated aldehyde with molecular oxygen at 240°to 390°C to give the corresponding unsaturated carboxylic acid is conducted in the presence of a catalyst represented by the following formula: Pa Mob Asc Xd Ye Zf Og WHEREIN A, B, C, D, E, F AND G REPRESENT THE ATOMIC RATIO OF EACH COMPONENT AND A IS 0.03 TO 0.2, B IS 1, C IS 0.015 TO 0.15, D IS 0.003 TO 1, E IS 0.003 TO 0.417, F IS 0.003 TO 1, AND G IS A VALUE DETERMINED BY THE VALENCIES OF THE ELEMENTS PRESENT IN THE CATALYST; AND WHEREIN X is copper, vanadium or mixtures thereof Y is at least one alkali metal selected from the group consisting of lithium, sodium, potassium, rubidium and cesium, and Z is at least one metal selected from the group consisting of magnesium, aluminum, calcium, titanium, zirconium, silver, antimony, tellurium, barium, tantalum and silicon. This catalyst is especially effective for the preparation of methacrylic acid from methacrolein, and has a very long lifetime.
대표청구항
▼
A process for the preparation of unsaturated carboxylic acids, which comprises catalytically oxidizing acrolein, methacrolein or mixtures thereof in the gas phase at a temperature of 240°to 390°C with molecular oxygen to form the corresponding unsaturated carboxylic acid in the presence of a catalys
A process for the preparation of unsaturated carboxylic acids, which comprises catalytically oxidizing acrolein, methacrolein or mixtures thereof in the gas phase at a temperature of 240°to 390°C with molecular oxygen to form the corresponding unsaturated carboxylic acid in the presence of a catalyst having the composition Pa Mob Asc Xd Ye Zf Og wherein a, b, c, d, e, f and g represent the atomic ratios of each component and a is within the range of 0.03 to 0.2, b is 1, c is within the range of 0.015 to 0.15, d is within the range of 0.003 to 1, e is within the range of 0.003 to 0.417, f is within the range of 0.003 to 1, and g is a value determined by the degree of oxidation of the elements present in the catalyst, and wherein X is copper, vanadium, or a mixture thereof, Y is at least one alkali metal selected from the group consisting of lithium, sodium, potassium rubidium and cesium, and Z is at least one metal selected from the group consisting of magnEsium, aluminum, calcium, titanium, zirconium, silver, antimony, tellurium, barium, tantalum and silicon.
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