DE707021C - Process for the production of acrolein - Google Patents
Process for the production of acroleinInfo
- Publication number
- DE707021C DE707021C DED78866D DED0078866D DE707021C DE 707021 C DE707021 C DE 707021C DE D78866 D DED78866 D DE D78866D DE D0078866 D DED0078866 D DE D0078866D DE 707021 C DE707021 C DE 707021C
- Authority
- DE
- Germany
- Prior art keywords
- acrolein
- production
- acetaldehyde
- formaldehyde
- building materials
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
- C07C45/68—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
- C07C45/72—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction of compounds containing >C = O groups with the same or other compounds containing >C = O groups
- C07C45/75—Reactions with formaldehyde
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Description
Verfahren zur Herstellung von Acrolein* Es ist bekannt, Acrolein durch überleiten von Formaldehyd und Acetaldehyd bei Temperaturen von zoo bis q.oo° über Katalysatoren herzustellen. Die Umsetzung erfolgt in Vorrichtungen, die in vielen Teilen, insbesandere in der Katalysatorkammer, aus Chrom-Nickel-Stahl bestehen.Process for the production of acrolein * It is known to use acrolein transfer formaldehyde and acetaldehyde at temperatures from zoo to q.oo ° over Manufacture catalysts. The implementation takes place in devices that in many Parts, especially in the catalyst chamber, are made of chrome-nickel steel.
Es hat sich nun gezeigt, daß Eisen und auch Aluminium eine erhebliche Zersetzungswirkung auf die zur Umsetzung kommenden Ausgangsstoffe ausüben, wodurch erhebliche Ausbeuteverminderungen bedingt sind. Auf dieser Erkenntnis beruht nun die vorliegende Erfindung, welche darin besteht, daß man Vorrichtungen benutzt, in denen mindestens die bei höheren Temperaturen mit den Ausgangsstoffen in Berührung kommenden Vorrichtungsteile frei von Eisen oder Aluminium sind. Vor allem haben sich Kupfer und seine Legierungen, ferner Silber, Nickel, Chro@in und keramische Stoffe, wie Schamotte oder Email, als Baustoffe geeignet erwiesen. An Stelle der obengenannten Metalle kommen auch Legierungen unter sich oder mit anderen Stoffen, z. B. Bronze oder Siliriumlegierungen, wie z. B. Silicium-Chrom-Legierung, in Frage. Die Vorrichtungsteile können aus den genannten Baustoffen bestehen oder mit diesen überzogen sein. Dabei ist es erfindungsgemäß wesentlich, daß vor allem der Katalysatorraum selbst sowie der ITterhitzer, daneben aber auch gegebenenfalls noch die weniger stark erhitzten Vorrichtungsteile, wie VerbI,ndungsrohre oder Ausrüstungsteile, die mit den Ausgangsstoffen in Berührung kommen, in der angegebenen Weise ausgestattet sind. Beispiel 49o kg einer 30%igen wässerigen Formaldehydlösung und 220 kg Acetaldehyd werden dampfförmig bei 300° über einen Katalysator aus Aluminiumphosphat, der sich in einer mit Silber ausgekleideten Kammer befindet, geleitet. Es wurden 70 1 eines Aluminiumphosphatkataly sators angewandt in einem ringförmigen Ofen mit einem Durchmesser von So mm und einer Höhe von etwa 2 m. über diesen Katalysator wurde ein Gasgemisch von i o kg/Std. während 71 Stunden darübergeleitet. Das bedeutet eine Kontaktbelastung in Aldehyd/1-Kontakt/Std. von etwa 2. Es wird ein wässeriges Gemisch erhalten, aus dem durch Aufarbeitung in üblicher Weise 12O,2 kg Acrolein, i i o kg Acetaldehyd und 67 kg Formaldehyd gewonnen werden. Das entspricht einer Ausbeute an Acrolein von SoOV, auf die angewandte Formaldehydmenge berechnet, und von 860;o, auf die angewandte Acetaldehydmenge berechnet.It has now been shown that iron and also aluminum have a considerable decomposition effect on the starting materials which are to be converted, which results in considerable reductions in yield. The present invention is based on this knowledge and consists in using devices in which at least the device parts which come into contact with the starting materials at higher temperatures are free of iron or aluminum. Above all, copper and its alloys, as well as silver, nickel, chromium and ceramic materials such as fireclay or enamel, have proven to be suitable as building materials. Instead of the above-mentioned metals, alloys come with one another or with other substances, e.g. B. bronze or silicon alloys, such as. B. silicon-chromium alloy, in question. The device parts can consist of the building materials mentioned or be coated with them. According to the invention, it is essential that the catalyst chamber itself and the heater, but also possibly the less heated device parts, such as connecting pipes or pieces of equipment that come into contact with the starting materials, are equipped in the specified manner. Example 49o kg of a 30% strength aqueous formaldehyde solution and 220 kg of acetaldehyde are passed in vapor form at 300 ° over a catalyst made of aluminum phosphate which is located in a chamber lined with silver. 70 l of an aluminum phosphate catalyst were used in an annular furnace with a diameter of 50 mm and a height of about 2 m. A gas mixture of 10 kg / hour was passed over this catalyst. passed over for 71 hours. This means a contact load in aldehyde / 1 contact / hour. of about 2. An aqueous mixture is obtained from which 120.2 kg of acrolein, 100 kg of acetaldehyde and 67 kg of formaldehyde are obtained by working up in the usual way. This corresponds to a yield of acrolein from SoOV, calculated on the amount of formaldehyde used, and of 860; o, calculated on the amount of acetaldehyde used.
Verwendet man eine Vorrichtung mit einer Katalysatorkammer aus Chrom-Nickel-Stahl, so erhiilt man 95,2 kg Acralein, i i o kg Acetaldehyd und 66 kg Formaldehyd, entsprechend einer Acroleinausbeute von 63 0 0, auf Formaldehyd berechnet, und von 731);ü, auf Acetaldehyd berechnet.If you use a device with a catalyst chamber made of chromium-nickel steel, this gives 95.2 kg of acralein, 10 kg of acetaldehyde and 66 kg of formaldehyde, respectively an acrolein yield of 63 0 0, calculated on formaldehyde, and of 731); ü, on Acetaldehyde calculated.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED78866D DE707021C (en) | 1938-09-11 | 1938-09-11 | Process for the production of acrolein |
BE435516A BE435516A (en) | 1938-09-11 | 1939-07-18 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED78866D DE707021C (en) | 1938-09-11 | 1938-09-11 | Process for the production of acrolein |
Publications (1)
Publication Number | Publication Date |
---|---|
DE707021C true DE707021C (en) | 1941-06-11 |
Family
ID=7062850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DED78866D Expired DE707021C (en) | 1938-09-11 | 1938-09-11 | Process for the production of acrolein |
Country Status (2)
Country | Link |
---|---|
BE (1) | BE435516A (en) |
DE (1) | DE707021C (en) |
-
1938
- 1938-09-11 DE DED78866D patent/DE707021C/en not_active Expired
-
1939
- 1939-07-18 BE BE435516A patent/BE435516A/fr unknown
Also Published As
Publication number | Publication date |
---|---|
BE435516A (en) | 1939-08-31 |
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