[특허]Process for the preparation of 3-(methylthio)propanal

[미국특허] Process for the preparation of 3-(methylthio)propanal 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C07C-031/900
출원번호	US-0667099 (1996-06-20)
발명자 / 주소	Hsu Yung C.
출원인 / 주소	Novus International, Inc.
대리인 / 주소	Senniger, Powers, Leavitt & Roedel
인용정보	피인용 횟수 : 7 인용 특허 : 8

초록 ▼

A process for the continuous preparation of 3-(methylthio)propanal. A liquid reaction medium is contacted with a gaseous acrolein feed stream in a gas/liquid contact zone. The reaction medium contains 3-(methylthio)propanal, methyl mercaptan and a catalyst for the reaction between methyl mercaptan and acrolein. The gaseous acrolein feed stream comprises acrolein vapor and non-condensable gas. Acrolein is transferred from the acrolein feed stream to the reaction medium and reacts with methyl mercaptan in that medium to produce a liquid reaction product containing 3-(methylthio)propanal. The non-condensable gas is separated from the liquid reaction product. The reaction product is divided into a product fraction and a circulating fraction, and the circulating fraction is recycled to the gas/liquid contact zone.

대표청구항 ▼

[ I claim:] [1.] A process for the continuous preparation of 3-(methylthio)propanal, comprising:contacting a liquid reaction medium with a gaseous acrolein feed stream in a gas/liquid contact zone through which said feed stream and said reaction medium are passed countercurrently, said reaction medium containing 3-(methylthio)propanal and a catalyst for the reaction between methyl mercaptan and acrolein, said gaseous acrolein feed stream comprising acrolein vapor and non-condensable gas, whereby acrolein is transferred from said feed stream to said reaction medium;introducing a primary methyl mercaptan feed stream into said countercurrent gas/liquid contact zone at a rate which provides a supply of methyl mercaptan that is less than stoichiometrically equivalent to the rate of introduction of acrolein into said contact zone;reacting acrolein with methyl mercaptan in a first reaction zone in which acrolein is in stoichiometric excess with respect to methyl mercaptan, thereby producing an intermediate reaction product;introducing a secondary methyl mercaptan feed stream into said intermediate reaction product outside said countercurrent gas/liquid contact zone;passing said intermediate reaction product into a second reaction zone where methyl mercaptan introduced in said secondary feed stream reacts to convert residual acrolein in the intermediate reaction product to 3-(methylthio)propanal;dividing the reaction medium exiting said second reaction zone into a product fraction and a circulating fraction; andrecirculating the circulating fraction to said countercurrent gas/liquid contact zone.

이 특허에 인용된 특허 (8) 인용/피인용 타임라인 분석

Etzkorn William G. (Cross Lanes WV) Harkreader Gordon G. (Charleston WV), Anhydrous diluent process for the propylene oxidation reaction to acrolein and acrolein oxidation to acrylic acid.
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Etzkorn William G. (Cross Lanes WV) Harkreader Gordon G. (Charleston WV), Anhydrous diluents for the isobutylene oxidation reaction to methacrolein and methacrolein oxidation to methacrylic acid.
상세보기
Etzkorn William G. (Cross Lanes WV) Harkreader Gordon G. (Charleston WV), Anhydrous diluents for the propylene oxidation reaction to acrolein and acrolein oxidation to acrylic acid.
상세보기
Sandler Stanley R. (Springfield PA), Preparation of 3-(alkylthio) aldehydes.
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Komorn Yves (Tassin-la-Demi-Lune FRX) Schwachhofer Ghislain (Miribel FRX), Preparation of beta-methylthiopropionaldehyde.
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Biola Georges (Venissieux FRX) Komorn Yves (Lyons FRX) Limongi Eric (Villeurbanne FRX), Process for the manufacture of beta-methylthiopropionaldehyde.
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Hsu Yung C. (Chesterfield MO) Ruest Dennis A. (Manchester MO), Process for the preparation of 3-(methylthio)propanal.
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Koberstein Edgar (Alzenau DT) Muller Klaus (Grossauheim DT) Theissen Ferdinand (Grossauheim DT), Process for the production of 3-methylmercaptopropionaldehyde.
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이 특허를 인용한 특허 (7) 인용/피인용 타임라인 분석

Zacchi, Pablo; Finkeldei, Caspar; Koerfer, Martin, Integrated process for preparing acrolein and 3-methylmercaptopropionaldehyde.
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D체bner,Frank; Weckbecker,Christoph, Method for preparing 3-(methylthio)propanal.
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M？ller,Alexander; B？ck,Wolfgang; Rautenberg,Stephan; Hasselbach,Hans Joachim; Taugner,Wolfgang; Heinzel,Harald; Zarfl,Theo, Method for the separation of methyl mercaptan from reaction gas mixtures.
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Eastwood, Ian; Dorland, Erwin; Taylor, Andrew, Plug flow system for identification and authentication of markers.
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Hsu Yung C. ; Ruest Dennis A., Process for the preparation of 3-(methylthio) propanal.
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Hsu, Yung C.; Ruest, Dennis A., Process for the preparation of 3-(methylthio)propanal.
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Stephen J. Lorbert ; James M. Willock ; Lewis B. Irvine ; Shubhender Kapila ; Virgil J. Flanigan ; Paul K. S. Nam ; Yvonne M. Liske, Reductive combustion of ammonium salts of sulfuric acid.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Process for the preparation of 3-(methylthio)propanal 원문보기