Process for preparing unsaturated carboxylic acids by the catalytic oxidation in the gas phase of the corresponding alde
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C07C-051/32
C07C-057/04
출원번호
US-0797671
(1977-05-17)
우선권정보
IT-0023448 (1976-05-20)
발명자
/ 주소
Padovan Mario (Milan ITX) Battiston Giancarlo (Baranzate ITX) Pignataro Francesco (Gallarate ITX) DeAlberti Giordano (Besnate ITX) Leofanti Giuseppe (Arese ITX)
출원인 / 주소
Montedison S.p.A. (Milan ITX 03)
인용정보
피인용 횟수 :
7인용 특허 :
1
초록▼
A process is disclosed for preparing unsaturated carboxylic acids consisting essentially in reacting in the vapor phase an unsaturated aldehyde with molecular oxygen or an oxygen-containing gas, at a temperature ranging from 200°to 370°C., in the presence of a solid catalyst, with a contact time bet
A process is disclosed for preparing unsaturated carboxylic acids consisting essentially in reacting in the vapor phase an unsaturated aldehyde with molecular oxygen or an oxygen-containing gas, at a temperature ranging from 200°to 370°C., in the presence of a solid catalyst, with a contact time between 0.5 and 5 seconds, characterized in that the catalyst consists essentially of molybdenum, vanadium, cobalt, and optionally tungsten, these elements being chemically combined with oxygen and the atomic ratios of the elements being represented by the empirical formula Mo12VaWbCocOd A IS BETWEEN 1.5 AND 3.0; B IS BETWEEN 0 AND 0.5; C IS BETWEEN 3.5 AND 5.5; AND D IS A NUMBER SUFFICIENT TO SATISFY THE VALENCES OF THE OTHER ELEMENTS, SAID CATALYST BEING PREPARED STARTING FROM AQUEOUS SOLUTIONS OF SOLUBLE SALTS OF THE ELEMENTS COMPOSING IT, BY THE COPRECIPITATION METHOD. Preferably, the coprecipitation is effected at a pH ranging from 2 to 5 and at a temperature between 20°and 90°C., by adding to a first solution containing cobalt in the form of the nitrate, a second solution containing molybdenum, vanadium, and optionally also tungsten, in the form of ammonium salts. The catalyst may be deposited on a carrier. Acrolein may be oxidized to acrylic acid, or methacrolein oxidized to methacrylic acid.
대표청구항▼
A process for preparing acrylic acid or methacrylic acid comprising reacting in the vapor phase acrolein or methacrolein, respectively, with molecular oxygen or an oxygen-containing gas, at a temperature ranging from 200°to 370°C., in the presence of a solid catalyst, with a contact time between 0.5
A process for preparing acrylic acid or methacrylic acid comprising reacting in the vapor phase acrolein or methacrolein, respectively, with molecular oxygen or an oxygen-containing gas, at a temperature ranging from 200°to 370°C., in the presence of a solid catalyst, with a contact time between 0.5 and 5 seconds, characterized in that the catalyst consists essentially of molybdenum, vanadium, cobalt, and optionally tungsten, these elements being chemically combined with oxygen and the atomic ratios of the elements being represented by the empirical formula Mo12VaWbCocOd wherein: a is between 1.5 and 3.0; b is between 0 and 0.5; c is between 3.5 and 5.5; and d is a number sufficient to satisfy the valences of the other elements; said catalyst being prepared by a coprecipitation method effected at a pH ranging from 2 to 5 and at a temperature between 20°and 90°C., by adding to a first solution containing cobalt in the form of the nitrate, a second solution containing molybdenum, vanadium, and optionally also tungsten, in the form of ammonium salts, thus obtaining a precipitate which is subjected to successive thermal treatments in air, comprising drying at 90°-130°C. for 10-20 hours, calcining at 200°-300°C. for 6-24 hours, and activation at 350°-450°C. for not less than two hours.
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이 특허에 인용된 특허 (1)
Ferlazzo Natale (Segrate (Milan) IT) Buzzi Gian Fausto (Arona (Novara) IT) Ghirga Marcello (Bresso (Milan) IT) Calcagno Benedetto (Milan IT), Process for preparing methyl acrylate or mixtures of methyl acrylate and acrylic acid.
Lonzetta, Charles Michael; Elder, James Edward; Klugherz, Peter David; Hale, Timothy Allen, High hydrocarbon space velocity process for preparing unsaturated aldehydes and acids.
Fukumoto,Naohiro; Tanimoto,Michio, Support for gas-phase oxidation catalyst and process for its production, gas-phase oxidation catalyst, and process for producing acrylic acid.
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