DE1618966B1 - Process for producing 1,2,4-trimethyl-5-alkylbenzenes - Google Patents
Process for producing 1,2,4-trimethyl-5-alkylbenzenesInfo
- Publication number
- DE1618966B1 DE1618966B1 DE1967S0112418 DES0112418A DE1618966B1 DE 1618966 B1 DE1618966 B1 DE 1618966B1 DE 1967S0112418 DE1967S0112418 DE 1967S0112418 DE S0112418 A DES0112418 A DE S0112418A DE 1618966 B1 DE1618966 B1 DE 1618966B1
- Authority
- DE
- Germany
- Prior art keywords
- pseudocumene
- trimethyl
- reaction
- propene
- alkylation
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C15/00—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts
- C07C15/02—Monocyclic hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
- C07C2/64—Addition to a carbon atom of a six-membered aromatic ring
- C07C2/66—Catalytic processes
- C07C2/68—Catalytic processes with halides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2527/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- C07C2527/06—Halogens; Compounds thereof
- C07C2527/125—Compounds comprising a halogen and scandium, yttrium, aluminium, gallium, indium or thallium
- C07C2527/126—Aluminium chloride
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
gegeben. Das Reaktionsgemisch wird auf eine Temperatur von 50 bis 70° C und unter einem effektiven Druck von 3 Bar gehalten.given. The reaction mixture is heated to a temperature of 50 to 70 ° C and under an effective Maintained pressure of 3 bar.
Das Gemisch 5 aus überschüssigem Pseudocumol und dem Alkylierungsprodukt wird kontinuierlich in ein Dekantiergefäß 6 überführt, in dem die Katalysatorsumpfprodukte durch Abpumpen über die Leitung 7 von der flüssigen Phase abgetrennt werden. Diese flüssige Phase 8 wird kontinuierlich einem Reaktionsgefäß 9 zugeführt und neutralisiert. Die aus der Zersetzung des Aluminiumchlorid-Pseudocumol-Komplexes stammende Chlorwasserstoffsäure wird mit Hilfe einer wäßrigen alkalischen Lösung 10, wie z. B. Natriumhydroxyd oder einer 5gewichtsprozentigen Lösung neutralisiert.The mixture 5 of excess pseudocumene and the alkylation product is continuously transferred to a decanter 6 in which the catalyst bottoms be separated from the liquid phase by pumping out via line 7. This liquid phase 8 is continuously a Reaction vessel 9 fed and neutralized. From hydrochloric acid resulting from the decomposition of the aluminum chloride-pseudocumene complex with the help of an aqueous alkaline solution 10, such as. B. sodium hydroxide or a 5 weight percent Solution neutralized.
Nach dem Neutralisieren wird das Gemisch 11, bestehend aus Pseudocumol, alkyliertem Pseudocumol, Wasser, der alkalischen Substanz und Alkalichlorid in ein Dekantiergefäß 12 überführt, in dem die aus Pseudocumol und dem Alkylat bestehende Kohlenwasserstoffschicht von der wäßrigen Schicht abgetrennt und letztere über 19 entfernt wird. Die dekantierte Kohlenwasserstoffschicht 13 wird in einer Bodenkolonne 14, vorzugsweise unter vermindertem Druck, destilliert.After neutralization, the mixture 11, consisting of pseudocumene, alkylated pseudocumene, Water, the alkaline substance and alkali chloride transferred to a decanter 12 in which the hydrocarbon layer consisting of pseudocumene and the alkylate from the aqueous layer separated and the latter is removed over 19. The decanted hydrocarbon layer 13 is in a Tray column 14, preferably under reduced pressure, distilled.
Die Stufe der Destillation ermöglicht die Abtrennung des Pseudocumols von den Trimethylisopropylbenzolen. Das in der Kolonne über Kopf abdestillierte Pseudocumol wird über die Leitung 15 in das Reaktionsgefäß 4 zurückgeführt. Der Destillationsrückstand 16 wird in eine Destillationskolonne 17, beispielsweise in eine Bodenkolonne eingeführt, wo am Kopf der Kolonne l,2,4-Trimethyl-5-isopropylbenzol im Gemisch mit einer geringen Menge eines nicht störenden Isomeren durch die Leitung 18 abgezogen wird.The distillation stage enables the pseudocumene to be separated off from the trimethylisopropylbenzenes. The pseudocumene distilled off overhead in the column is fed into the reaction vessel via line 15 4 returned. The distillation residue 16 is in a distillation column 17, for example introduced into a tray column, where at the top of the column l, 2,4-trimethyl-5-isopropylbenzene withdrawn through line 18 in a mixture with a small amount of a non-interfering isomer will.
Nachfolgend wird die diskontinuierliche Alkylierung von Pseudocumol mit Propen an Hand eines Beispiels näher beschrieben.The following is the discontinuous alkylation of pseudocumene with propene using one Example described in more detail.
In ein Reaktionsgefäß mit 2000 cm3 Fassungsvermögen werden 960 g Pseudocumol (8 Mol) und 5 g (0,04 Mol) wasserfreies Aluminiumchlorid, entsprechend 0,005 Mol AlCl3 pro Mol Pseudocumol, eingebracht. Die Temperatur wird bei 30° C gehalten. Im Verlauf einer Stunde werden mit einem Durchsatz von 451/Std. 2 Mol Propen eingeführt und nach dem Durchgang des gesamten Propens das Rührerf noch eine weitere Stunde fortgesetzt.960 g of pseudocumene (8 mol) and 5 g (0.04 mol) of anhydrous aluminum chloride, corresponding to 0.005 mol of AlCl 3 per mol of pseudocumene, are introduced into a reaction vessel with a capacity of 2000 cm 3. The temperature is kept at 30 ° C. Over the course of an hour, with a throughput of 451 / hour. 2 moles of propene were introduced and, after all of the propene had passed through, the stirrer continued for a further hour.
Während des Verlaufs der Umsetzung wird der Druck bei 1,4 Bar gehalten.During the course of the reaction, the pressure is kept at 1.4 bar.
Nach dem Abdekantieren des Katalysators wird das Reaktionsprodukt mit 100 cm3 einer 5gewichtsprozentigen Natriumhydroxidlösung gewaschen. Es wird ein Volumen von 1100 cm3 erhalten.After the catalyst has been decanted off, the reaction product is washed with 100 cm 3 of a 5 percent strength by weight sodium hydroxide solution. A volume of 1100 cm 3 is obtained.
Das Gemisch aus Pseudocumol und Alkylat wird anschließend bei Atmosphärendruck über eine Kolonne mit 15 theoretischen Böden destilliert. Es werden zwei Schnitte erhalten:The mixture of pseudocumene and alkylate is then passed through a column at atmospheric pressure distilled with 15 theoretical plates. Two cuts are obtained:
1. Pseudocumol-Schnitt (167/188°C), 674 g (70 Gewichtsprozent). 1. Pseudocumene cut (167/188 ° C), 674 g (70 percent by weight).
2. Trimethyl-isopropylbenzol-Schnitt (2200C), 286 g (30 Gewichtsprozent).2. Trimethylisopropylbenzene cut (220 ° C.), 286 g (30 percent by weight).
Die erhaltenen 286 g Trimethyl-isopropylbenzol entsprechen 1,77 Mol und einer 88,5°/oigen theoretischen Ausbeute, bezogen auf das eingesetzte Propen.The obtained 286 g of trimethyl-isopropylbenzene corresponding to 1.77 mol and a 88.5 ° / o solution of the theoretical yield based on the propene used.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (2)
benzol in an sich bekannter Weise nach dem Die Katalysatorkonzentration liegt bei der Durch-Neutralisieren des angesäuerten Reaktionsgemi- führung des erfindungsgemäßen Verfahrens zwischen sches durch Destillation gewinnt. 20 0,002 und 0,02, vorzugsweise zwischen 0,002 und1. Process for the production of 1,2,4-tri- 5 a process is solved in which pseudocumene with methyl-5-alkylbenzenes by alkylating pseudopropene or ethylene in the presence of anhydrous documol with propylene or ethylene in the presence of AlCl 3 is alkylated at temperatures between 30 and 100 ° C of anhydrous aluminum chloride as a Kata-, which is characterized in that lysator at temperatures between 30 and 100 0 C, the alkylation at a molar ratio of olefin characterized by ge that the io to Pseudocumene of 0.2: 1, especially 0.25: 0.5, in alkylation at a molar ratio of olefin presence of 0.002 to 0.02 mol of AlCl 3 per mol to pseudocumene of 0.2 to 1, especially of pseudocumene as a catalyst , at a pressure of 0.25 to 0.5, in the presence of 0.002 to 0.02 mol between 1 and 3 bar, especially at temperatures AlCl 3 per mol of pseudocumene as a catalyst, at between 30 and 70 0 C and the one formed Pressure between 1 and 3 bar, esp ers 15 l, 2,4-trimethyl-5-alkylbenzene in a known manner at temperatures between 30 and 70 0 C, through-way after neutralizing the acidified and the l, 2,4-trimethyl-5-alkyl formed Reaction mixture obtained by distillation,
benzene in a manner known per se after the The catalyst concentration is during the through-neutralization of the acidified reaction mixture of the process according to the invention between it wins by distillation. 20 0.002 and 0.02, preferably between 0.002 and
Pseudocumol je Mol Katalysator je Stunde Die Reaktion wird bei einem Druck zwischenwith a space velocity of 200 MoL 100 0 C, preferably between 30 and 70 0 C.
Pseudocumene per mole of catalyst per hour The reaction is carried out at a pressure between
pylen oder Äthylen zu l,2,4-Trimethyl-5-isopropyl- Bei kontinuierlicher Durchführung des erfindungs-The invention relates to a process for the preparation. Before the last distillation, the reaction of 1,2,4-methylbenzene (pseudocumene), acidified by the 1,2,4-trimethyl-5-alkylbenzenes by alkylation, decomposition of the aluminum chloride, is expediently treated with the proposition product neutralized,
pylene or ethylene to l, 2,4-trimethyl-5-isopropyl- When the invention is carried out continuously
methylbenzol und 1,2,4,5-Tetramethyrbenzol abtrennt. Nachfolgend wird die kontinuierliche Herstellunga temperature of 80 to 90 0 C for the reaction leads to the formation of l, 2,4-trimethyl-5-ethylbenzene brings and then from the resulting reaction 60 with a lower yield in the isomer mixture, a mixture of 1-isopropyl-2, 4,5-tri- (55 ° / 0 , based on the theoretical yield),
methylbenzene and 1,2,4,5-tetramethyrbenzene are separated off. The following is continuous manufacturing
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR107630A FR1531632A (en) | 1967-05-24 | 1967-05-24 | Pseudocumene alkylation process |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1618966B1 true DE1618966B1 (en) | 1972-05-25 |
Family
ID=8631480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1967S0112418 Pending DE1618966B1 (en) | 1967-05-24 | 1967-10-16 | Process for producing 1,2,4-trimethyl-5-alkylbenzenes |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE705179A (en) |
DE (1) | DE1618966B1 (en) |
FR (1) | FR1531632A (en) |
GB (1) | GB1164210A (en) |
LU (1) | LU54644A1 (en) |
NL (1) | NL6715441A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2412595A (en) * | 1942-03-03 | 1946-12-17 | Phillips Petroleum Co | Process for reaction of aromatic hydrocarbons with normally gaseous unsaturated hydrocarbons |
US2837584A (en) * | 1955-10-31 | 1958-06-03 | Standard Oil Co | Process for production of durene |
US3132189A (en) * | 1961-07-17 | 1964-05-05 | Marathon Oil Co | Preparation of 1, 2, 4, 5-tetrallkylbenzenes from pseudocumene and propylene |
FR1460349A (en) * | 1964-12-18 | 1966-11-25 | Gelsenberg Benzin Ag | Process for preparing trimethyl-1,2,4-isopropyl-5-benzene |
-
1967
- 1967-05-24 FR FR107630A patent/FR1531632A/en not_active Expired
- 1967-10-10 LU LU54644D patent/LU54644A1/xx unknown
- 1967-10-16 DE DE1967S0112418 patent/DE1618966B1/en active Pending
- 1967-10-16 BE BE705179D patent/BE705179A/xx unknown
- 1967-10-24 GB GB4819867A patent/GB1164210A/en not_active Expired
- 1967-11-14 NL NL6715441A patent/NL6715441A/xx unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2412595A (en) * | 1942-03-03 | 1946-12-17 | Phillips Petroleum Co | Process for reaction of aromatic hydrocarbons with normally gaseous unsaturated hydrocarbons |
US2837584A (en) * | 1955-10-31 | 1958-06-03 | Standard Oil Co | Process for production of durene |
US3132189A (en) * | 1961-07-17 | 1964-05-05 | Marathon Oil Co | Preparation of 1, 2, 4, 5-tetrallkylbenzenes from pseudocumene and propylene |
FR1460349A (en) * | 1964-12-18 | 1966-11-25 | Gelsenberg Benzin Ag | Process for preparing trimethyl-1,2,4-isopropyl-5-benzene |
Also Published As
Publication number | Publication date |
---|---|
GB1164210A (en) | 1969-09-17 |
BE705179A (en) | 1968-03-01 |
LU54644A1 (en) | 1967-12-11 |
FR1531632A (en) | 1968-07-05 |
NL6715441A (en) | 1968-11-25 |
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