EP0000880A1 - Process for the preparation of aromatic carbonic acid esters - Google Patents
Process for the preparation of aromatic carbonic acid esters Download PDFInfo
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- EP0000880A1 EP0000880A1 EP78100571A EP78100571A EP0000880A1 EP 0000880 A1 EP0000880 A1 EP 0000880A1 EP 78100571 A EP78100571 A EP 78100571A EP 78100571 A EP78100571 A EP 78100571A EP 0000880 A1 EP0000880 A1 EP 0000880A1
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- methanol
- transesterification
- dimethyl carbonate
- acid esters
- carbonic acid
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C68/00—Preparation of esters of carbonic or haloformic acids
- C07C68/06—Preparation of esters of carbonic or haloformic acids from organic carbonates
Definitions
- the invention relates to a process for the preparation of aromatic carbonic acid esters from dimethyl carbonate and phenols by transesterification.
- transesterification of aliphatic carbonic acid esters with phenols in the presence of strong bases or of alkali compounds is known according to DBP 971 790, 1 020 184, 1 026 958 and 1 031 512.
- Transesterification processes catalyzed in this way have the disadvantage of not being very selective, since considerable amounts of carbon dioxide are released in a side reaction.
- DOS 2 528 412 describes a corresponding transesterification process for the production of aromatic carbonic acid esters in the presence of Lewis acids, ie transition metal halides, or the corresponding acyloxy, alkoxy or aryloxy compounds as catalysts. If dimethyl carbonate is used as the starting material, then a complex cleaning and separation operation must be carried out to obtain pure dimethyl carbonate (USP 3 803 201, DBP 2 450 856 and OLS 2 607 003), since in the known production processes of dimethyl carbonate (USP 2 642 858 and DOS 2 615 665) an approximately 30% by weight azeotrope with methanol is obtained.
- the task was therefore to find a transesterification process which allows the use of this azeotrope or another mixture of dimethyl carbonate and methanol.
- concentration of dimethyl carbonate in methanol is in the range from 95 to 10% by weight.
- the technically important 30% by weight azeotrope is preferred.
- the invention therefore relates to a process for the preparation of aromatic carbonic acid esters by transesterification of dimethyl carbonate with phenols with the elimination of methanol in the presence of transesterification catalysts, which is characterized in that mixtures of dimethyl carbonate / methanol and methanol-immiscible azeotrope formers are used for the transesterification.
- Azeotropic agents suitable according to the invention are preferably saturated aliphatic hydrocarbons with C 5 -C 8 and with boiling points of 40-130 ° C., such as pentane, hexane, heptane, octane and isooctane, and also technical gasoline fractions which predominantly contain the hydrocarbons mentioned, such as petroleum ether , Ligroin and mineral spirits, and mixtures of the hydrocarbons mentioned.
- the azeotroping agents are expediently used at least in an amount which is sufficient to distill over both the methanol introduced with the dimethyl carbonate / methanol mixture and the methanol formed during the transesterification.
- the amount of azeotroping agent to be added can be found in the known tables (e.g.
- Suitable phenols are preferably compounds of the general formula (I) in which X is hydrogen, an alkyl radical with C 1 -C 3 ' a halogen atom, preferably chlorine, or a nitro group and n is 1 or 2, phenol, o, m, p-cresol, o, m, p are particularly preferred -Chlorphenol, o, m, p-ethylphenol, o, m, p-propylphenol, o, m, p-nitrophenol, 26-dimethylphenol, 2,4-dimethylphenol or 3,4-dimethylphenol used.
- X is hydrogen, an alkyl radical with C 1 -C 3 ' a halogen atom, preferably chlorine, or a nitro group and n is 1 or 2
- phenol, o, m, p-cresol, o, m, p are particularly preferred -Chlorphenol, o, m, p-ethylphenol,
- the known Umestimiskata- l y catalysts can be used. These are preferably alkali metal compounds such as lithium, sodium, potassium hydroxides, alcoholates, phenolates, carboxylates and carbonates , Phenoxytriethyltin, dimethyldibutyltin, dimethyltin glycolate, diethoxydibutyltin, diphenoxydibutyltin, dimethoxydiphenyltin, triethyltin hydroxide, triphenyltin hydroxide, hexaethylstannoxane, hexabutylstannoxane, tetrabutyltinoxhen, tetrabutyltinoxhen, tetrabutyltinoxhen, tetrabutyltinoxhen, tetrabutyltin dophen,
- alkali metal compounds such as lithium, sodium, potassium hydroxides, alcoholates, phenolates, carboxylates and carbonates
- the catalysts are used in concentrations of about 0.001-20% by weight, based on the total amount of reaction.
- the weight ratio of dimethyl carbonate: phenol can vary within wide limits and can be between about 1:99 and 99: 1, preferably 1: 9 and 9: 1. It depends on this ratio whether arylphenyl carbonate or diaryl carbonate predominates in the end product.
- the methylaryl carbonate formed in addition to diaryl carbonate can be separated off without difficulty by distillation and either reacted with fresh phenol or, after the diaryl carbonate has been separated off, recycled for further reaction.
- the reaction temperatures are preferably in the range from 50 to 250 ° C., particularly preferably from 100 to 200 ° C. It is advantageous to work at a pressure of 1 Torr to 20 Atms, preferably 1-5 Atms.
- the preferred procedure is to bring the transesterification mixture to the desired reaction temperature in a longer column, to separate the methanol to the extent that it is released in the reaction mixture, together with the azeotrope, if appropriate with the aid of an inert gas stream, and to dimethyl carbonate with the azeotrope in the Measurements of how the reaction material is depleted of both substances to be fed to the lower part of the column.
- the process products can be converted to polycarbonates in a known manner or serve as starting materials for crop protection agents.
- a total of 340 g of dimethyl carbonate / methanol azeotrope with 400 g of heptane corresponding to 1.13 mol of dimethyl carbonate are used in this way.
- the reaction mixture is fractionated over a 1 m high column.
- dimethyl carbonate and heptane go forward at 69 - 74 ° C / 8 Torr 887 g of non-reacted phenol, in 83 160 0 C / 8 Torr 32.5 g of diphenyl carbonate.
- the yield of aromatic carbonates, based on the converted phenol, is therefore 94% of theory. Th.
Abstract
Verfahren zur Herstellung aromatischer Kohlensäureester durch Umesterung von Gemischen aus Dimethylcarbonat/Methanol und einem Azeotropbildner für Methanol, der mit Methanol nicht mischbar ist, mit Phenolen in Gegenwart von Umesterungskatalysatoren.Process for the production of aromatic carbonic acid esters by transesterification of mixtures of dimethyl carbonate / methanol and an azeotrope for methanol, which is immiscible with methanol, with phenols in the presence of transesterification catalysts.
Description
Die Erfindung betrifft ein Verfahren zur Herstellung arcmatischer Kohlensäureester aus Dimethylcarbonat und Phenolen durch Umesterung.The invention relates to a process for the preparation of aromatic carbonic acid esters from dimethyl carbonate and phenols by transesterification.
Die Umesterung aliphatischer Kohlensäureester mit Phenolen in Anwesenheit starker Basen bzw. von Alkaliverbindungen ist nach DBP 971 790, 1 020 184, 1 026 958 und 1 031 512 bekannt. Derart katalysierte Umesterungsverfahren haben den Nachteil, wenig selektiv zu sein, da in einer Nebenreaktion erhebliche Mengen an Kohlendioxid freigesetzt werden.The transesterification of aliphatic carbonic acid esters with phenols in the presence of strong bases or of alkali compounds is known according to DBP 971 790, 1 020 184, 1 026 958 and 1 031 512. Transesterification processes catalyzed in this way have the disadvantage of not being very selective, since considerable amounts of carbon dioxide are released in a side reaction.
In der DOS 2 528 412 ist ein entsprechendes Umesterungsverfahren zur Herstellung aromatischer Kohlensäureester in Gegenwart von Lewissäuren, d. h. Ubergangsmetallhalogeniden, oder den entsprechenden Acyloxy-, Alkoxy- oder Aryloxyverbindungen als Katalysatoren beschrieben. Wird hierbei als Ausgangsmaterial Dimethylcarbonat verwendet, dann muß eine aufwendige Reinigungs- und Trennoperation zur Gewinnung reinen Dimethylcarbonats vorgenommen werden (USP 3 803 201, DBP 2 450 856 und OLS 2 607 003), da bei den bekannten Herstellungsverfahren von Dimethylcarbonat (USP 2 642 858 und DOS 2 615 665) ein etwa 30 Gew.-% Azeotrop mit Methanol anfällt.DOS 2 528 412 describes a corresponding transesterification process for the production of aromatic carbonic acid esters in the presence of Lewis acids, ie transition metal halides, or the corresponding acyloxy, alkoxy or aryloxy compounds as catalysts. If dimethyl carbonate is used as the starting material, then a complex cleaning and separation operation must be carried out to obtain pure dimethyl carbonate (USP 3 803 201, DBP 2 450 856 and OLS 2 607 003), since in the known production processes of dimethyl carbonate (USP 2 642 858 and DOS 2 615 665) an approximately 30% by weight azeotrope with methanol is obtained.
Es stellte sich deshalb die Aufgabe, ein Umesterungsverfahren zu finden, das die Verwendung dieses Azeotrops bzw. eines sonstigen Gemisches aus Dimethylcarbonat und Methanol gestattet. Die Konzentration von Dimethylcarbonat in Methanol liegt im Bereich von 95 bis 10 Gew.-%. Bevorzugt wird das technisch wichtige 30 Gew.-% Azeotrop.The task was therefore to find a transesterification process which allows the use of this azeotrope or another mixture of dimethyl carbonate and methanol. The concentration of dimethyl carbonate in methanol is in the range from 95 to 10% by weight. The technically important 30% by weight azeotrope is preferred.
Die Lösung dieser Aufgabe gelang durch die Mitverwendung von mit Methanol nicht mischbaren Azeotropbildnern für Methanol.This problem was solved by using methanol-immiscible azeotroping agents for methanol.
Gegenstand der Erfindung ist daher ein Verfahren zur Herstellung aromatischer Kohlensäureester durch Umesterung von Dimethylcarbonat mit Phenolen unter Abspaltung von Methanol in Gegenwart von Umesterungskatalysatoren, das dadurch gekennzeichnet ist, daß man zur Umesterung Gemische aus Dimethylcarbonat/ Methanol und mit Methanol nicht mischbare Azeotropbildner für Methanol verwendet.The invention therefore relates to a process for the preparation of aromatic carbonic acid esters by transesterification of dimethyl carbonate with phenols with the elimination of methanol in the presence of transesterification catalysts, which is characterized in that mixtures of dimethyl carbonate / methanol and methanol-immiscible azeotrope formers are used for the transesterification.
Erfindungsgemäß geeignete Azeotropbildner sind vorzugsweise gesättigte aliphatische Kohlenwasserstoffe mit C5-C8 und mit Siedepunkten von 40 - 130°C, wie Pentan, Hexan, Heptan, Octan und Isooctan, ferner technische Benzinfrak- tionen,die vorwiegend die genannten Kohlenwasserstoffe enthalten, wie Petroläther, Ligroin und Leichtbenzin,sowie Gemische der genannten Kohlenwasserstoffe.
Die Azeotropbildner werden zweckmäßig zumindest in einer solchen Menge eingesetzt, die ausreicht, sowohl das mit dem Dimethylcarbonat/Methanol-Gemisch eingebrachte als auch das während der Umesterung gebildete Methanol überzudestillieren. Die zuzusetzende Menge an Azeotropbildner kann den bekannten Tabellen (z. B. in Handbook of Chemistry and Physics, 51. Edit. (1970), the Rubber Comp., Cleveland/Ohio) mit den Angaben über die jeweiligen Azeotropzusammensetzungen entnommen oder durch einfache Vorversuche ermittelt werden. Ein Überschuß an Azeotropbildner schadet nicht, er ist nur im Interesse einer ökonomischen Energiebilanz möglichst niedrig zu halten.Azeotropic agents suitable according to the invention are preferably saturated aliphatic hydrocarbons with C 5 -C 8 and with boiling points of 40-130 ° C., such as pentane, hexane, heptane, octane and isooctane, and also technical gasoline fractions which predominantly contain the hydrocarbons mentioned, such as petroleum ether , Ligroin and mineral spirits, and mixtures of the hydrocarbons mentioned.
The azeotroping agents are expediently used at least in an amount which is sufficient to distill over both the methanol introduced with the dimethyl carbonate / methanol mixture and the methanol formed during the transesterification. The amount of azeotroping agent to be added can be found in the known tables (e.g. in the Handbook of Chemistry and Physics, 51st edit. (1970), the Rubber Comp., Cleveland / Ohio) with the information about the respective azeotropic compositions or can be determined by simple preliminary tests. An excess of azeotroping agents does no harm, it can only be kept as low as possible in the interest of an economic energy balance.
Überraschenderweise gelingt es mit dem erfindungsgemäßen Verfahren,das aus dem während der Umesterungsreaktion gebildeten Methanol und einem der genannten Kohlenwasserstoffe bestehende Azeotrop abzutrennen, obwohl diese Kohlenwasserstoffe bekanntlich auch mit Dimethylcarbonat azeotropsiedende Gemische bilden. Nach dem Verfahren der Erfindung werden praktisch die gleichen Ausbeuten wie nach dem bekannten Verfahren erzielt, ohne daß das eingesetzte Dimethylcarbonat vor der Umesterungsreaktion isoliert werden muß.Surprisingly, it is possible with the process according to the invention to separate the azeotrope formed from the methanol formed during the transesterification reaction and one of the hydrocarbons mentioned, although these hydrocarbons are also known to form azeotropic-boiling mixtures with dimethyl carbonate. The process of the invention achieves practically the same yields as in the known process without the dimethyl carbonate used having to be isolated before the transesterification reaction.
Als Phenole eignen sich vorzugsweise Verbindungen der allgemeinen Formel (I)
Anstelle der einwertigen Phenole können auch Bisphenole wie Dihydroxydiarylalkane mit Ci-C4 im Alkylrest wie z.B. Bisphenol A, eingesetzt werden.Instead of the monohydric phenols, it is also possible to use bisphenols such as dihydroxydiarylalkanes with C i -C 4 in the alkyl radical, such as, for example, bisphenol A.
Als Katalysatoren können die bekannten Umesterungskata- lysatoren verwendet werden. Vorzugsweise sind dies Alkaliverbindungen wie Lithium-, Natrium-, Kaliumhydroxide, -alkoholate, -phenolate, -carboxylate und -carbonate.Vorzugsweise werden auch zinnorganische Verbindungen wie Trimethylzinnacetat, Triäthylzinnbenzoat, Tributylzinnacetat, Triphenylzinnacetat, Dibutylzinnacetat, Dibutylzinndilaurat, Dioctylzinndilaurat, Dibutylzinnadipinat, Methoxytributylzinn, Methoxytriphenylzinn, Phenoxytriäthylzinn, Dimethyldibutylzinn, Dimethylzinnglykolat, Diäthoxydibutylzinn, Diphenoxydibutylzinn, Dimethoxydiphenylzinn, Triäthylzinnhydroxid, Triphenylzinnhydroxid, Hexaäthylstannoxan, Hexabutylstannoxan, Tetrabutyldiphenoxystannoxan, Dibutylzinnoxid und Dioctylzinnoxid und Titanverbindungen vom Tvp des Tetrabutyl- oder Tetraphenyltitanats eingesetzt.As catalysts the known Umesterungskata- l y catalysts can be used. These are preferably alkali metal compounds such as lithium, sodium, potassium hydroxides, alcoholates, phenolates, carboxylates and carbonates , Phenoxytriethyltin, dimethyldibutyltin, dimethyltin glycolate, diethoxydibutyltin, diphenoxydibutyltin, dimethoxydiphenyltin, triethyltin hydroxide, triphenyltin hydroxide, hexaethylstannoxane, hexabutylstannoxane, tetrabutyltinoxhen, tetrabutyltinoxhen, tetrabutyltinoxhen, tetrabutyltin dophen,
Die Katalysatoren werden in Konzentrationen von etwa 0,001 - 20 Gew.-%, bezogen auf die gesamte Reaktionsmenge, einqesetzt. Das Gewichtsverhältnis von Dimethylcarbonat : Phenol kann in weiten Grenzen schwanken und zwischen etwa 1:99 und 99:1, vorzugsweise 1:9 und 9:1 liegen. Von diesem Verhältnis hängt es ab, ob im Endprodukt Arylphenylcarbonat oder Diarylcarbonat überwiegt.The catalysts are used in concentrations of about 0.001-20% by weight, based on the total amount of reaction. The weight ratio of dimethyl carbonate: phenol can vary within wide limits and can be between about 1:99 and 99: 1, preferably 1: 9 and 9: 1. It depends on this ratio whether arylphenyl carbonate or diaryl carbonate predominates in the end product.
Ohne Schwierigkeit kann das neben Diarylcarbonat gebildete Methylarylcarbonat durch Destillation abgetrennt und entweder mit frischem Phenol umgesetzt oder nach Abtrennung des Diarylcarbonats zur weiteren Umsetzung zurückgeführt werden.The methylaryl carbonate formed in addition to diaryl carbonate can be separated off without difficulty by distillation and either reacted with fresh phenol or, after the diaryl carbonate has been separated off, recycled for further reaction.
Die Peaktionstemperaturen liegen bevorzugt im Bereich von 50 - 250°C, besonders bevorzugt von 100 - 200°C. Vorteilhafterweise wird bei einem Druck von 1 Torr bis 20 Atms., vorzugsweise bei 1 - 5 Atms gearbeitet.The reaction temperatures are preferably in the range from 50 to 250 ° C., particularly preferably from 100 to 200 ° C. It is advantageous to work at a pressure of 1 Torr to 20 Atms, preferably 1-5 Atms.
Die bevorzugte Verfahrensweise besteht darin, das Umesterungsgemisch an einer längeren Kolonne auf die gewünschte Reaktionstemperatur zu bringen, das Methanol in dem Maße, wie es im Reaktionsgut freigesetzt wird, zusammen mit dem Azeotropbildner gegebenenfalls mit Hilfe eines inerten Gasstromes abzutrennen und Dimethylcarbonat mit dem Azeotropbildner in dem Maße, wie das Reaktionsgut an beiden Stoffen verarmt, dem unteren Teil der Kolonne zuzuführen.The preferred procedure is to bring the transesterification mixture to the desired reaction temperature in a longer column, to separate the methanol to the extent that it is released in the reaction mixture, together with the azeotrope, if appropriate with the aid of an inert gas stream, and to dimethyl carbonate with the azeotrope in the Measurements of how the reaction material is depleted of both substances to be fed to the lower part of the column.
Die Verfahrensprodukte können in bekannter Weise zu Polycarbonaten umgesetzt werden oder dienen als Ausgangsstoffe für Pflanzenschutzmittel.The process products can be converted to polycarbonates in a known manner or serve as starting materials for crop protection agents.
a) An einer mit Glasringen beschickten 2,9 m hohen verspiegelten Füllkörperkolonne werden 940 g (10 Mol) Phenol, 150 g 30 proz. Dimethylcarbonat/Methanol-Azeotrop (0,5 Mol), 100 g n-Heptan und 2 g Tetrabutyltitanat erhitzt, so daß bei 58 - 59°C ein im wesentlichen aus Heptan und Methanol bestehendes zweiphasiges Azeotrop abgenommen werden kann. Im Laufe der 45 stdg. Reaktionszeit wird die dem abdestillierten Methanol/Heptan-Gemisch entsprechende Menge Dimethylcarbonat und Heptan in der Mitte der Kolonne so zugesetzt, daß die Sumpftemperatur 160°C beträgt. Insgesamt werden auf diese Weise 340 g Dimethylcarbonat/Methanol-Azeotrop mit 400 g Heptan entsprechend 1,13 Mol Dimethylcarbonat eingesetzt. Das Reaktionsgut wird über eine 1 m hohe Kolonne fraktioniert. Nach einem aus Methanol, Dimethylcarbonat und Heptan bestehenden Vorlauf gehen bei 69 - 74°C/8 Torr 887 g nicht umgesetztes Phenol, bei 83 - 930C/8 Torr 30,6 g Methylphenylcarbonat und bei 146 - 1600C/8 Torr 32,5 g Diphenylcarbonat über. Somit beträgt die Ausbeute an aromatischen Carbonaten, bezogen auf umgesetztes Phenol 94 % d. Th.a) 940 g (10 mol) of phenol, 150 g of 30 percent are on a 2.9 m high mirrored packed column loaded with glass rings. Dimethyl carbonate / methanol azeotrope (0.5 mol), 100 g of n-heptane and 2 g of tetrabutyl titanate are heated so that a two-phase azeotrope consisting essentially of heptane and methanol can be removed at 58-59 ° C. In the course of the 45 hour reaction time, the amount of dimethyl carbonate and heptane corresponding to the distilled-off methanol / heptane mixture is added in the middle of the column in such a way that the bottom temperature is 160 ° C. A total of 340 g of dimethyl carbonate / methanol azeotrope with 400 g of heptane corresponding to 1.13 mol of dimethyl carbonate are used in this way. The reaction mixture is fractionated over a 1 m high column. 8 Torr 93 0 C / 30.6 g of methyl phenyl carbonate and 146 - - After a group consisting of methanol, dimethyl carbonate and heptane go forward at 69 - 74 ° C / 8 Torr 887 g of non-reacted phenol, in 83 160 0 C / 8 Torr 32.5 g of diphenyl carbonate. The yield of aromatic carbonates, based on the converted phenol, is therefore 94% of theory. Th.
b) Ein Gemisch von 45,6 g (0,2 Mol) 2,2-Bis-(4-hydroxyphenyl)-propan, 47,1 g (0,22 Mol) des nach a) hergestellten Diphenylcarbonats und 0,008 g Natriummethylat wird langsam bis auf 210° unter 20 Torr erhitzt, wobei die Hauptmenge des abgespaltenen Phenols abdestilliert. Dann wird der Druck auf 0,2 Torr ermäßigt und die Temperatur während einer Stunde auf 250°C und während zweier weiterer Stunden auf 280°C erhöht, bis die Schmelze so zäh geworden ist, daß sie sich kaum mehr rühren läßt. Beim Abkühlen erhält man einen klaren, farblosen, elastischen Kunststoff, aus dessen Schmelze Formkörper mit hervorragenden Festigkeitseigenschaften hergestellt werden können.b) A mixture of 45.6 g (0.2 mol) of 2,2-bis (4-hydroxyphenyl) propane, 47.1 g (0.22 mol) of the diphenyl carbonate prepared according to a) and 0.008 g of sodium methylate slowly heated to 210 ° under 20 torr, the majority of the phenol cleaved off. Then the pressure is reduced to 0.2 torr and the temperature was raised to 250 ° C. for one hour and to 280 ° C. for another two hours until the melt had become so tough that it could hardly be stirred. When cooling, a clear, colorless, elastic plastic is obtained, from the melt of which molded articles with excellent strength properties can be produced.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2736063 | 1977-08-10 | ||
| DE19772736063 DE2736063A1 (en) | 1977-08-10 | 1977-08-10 | Process for the preparation of aromatic carbonic acid esters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0000880A1 true EP0000880A1 (en) | 1979-03-07 |
| EP0000880B1 EP0000880B1 (en) | 1981-01-14 |
Family
ID=6016077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP78100571A Expired EP0000880B1 (en) | 1977-08-10 | 1978-08-02 | Process for the preparation of aromatic carbonic acid esters |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4252737A (en) |
| EP (1) | EP0000880B1 (en) |
| JP (1) | JPS5448732A (en) |
| DE (2) | DE2736063A1 (en) |
| IT (1) | IT7850655A0 (en) |
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| EA010425B1 (en) | 2004-10-14 | 2008-08-29 | Асахи Касеи Кемикалз Корпорейшн | Process for production of high-purity diaryl carbonates |
| TWI321561B (en) * | 2004-12-21 | 2010-03-11 | Asahi Kasei Chemicals Corp | Method for producing aromatic carbonate |
| JP4195717B2 (en) | 2004-12-24 | 2008-12-10 | 旭化成ケミカルズ株式会社 | Method for producing aromatic carbonate |
| JP5030788B2 (en) * | 2005-11-30 | 2012-09-19 | 旭化成ケミカルズ株式会社 | Industrial production method of high quality aromatic polycarbonate |
| WO2007069463A1 (en) * | 2005-12-12 | 2007-06-21 | Asahi Kasei Chemicals Corporation | Process for industrially producing high quality aromatic polycarbonate |
| KR20080069697A (en) * | 2005-12-19 | 2008-07-28 | 아사히 가세이 케미칼즈 가부시키가이샤 | Process for producing high-purity diphenyl carbonate on an industrial scale |
| EP2711353B1 (en) | 2012-09-20 | 2018-10-31 | SABIC Global Technologies B.V. | Process for the continuous manufacture of aryl alkyl carbonate and diaryl carbonate using vapor recompression |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2528412A1 (en) * | 1974-06-25 | 1976-01-08 | Snam Progetti | PROCESS FOR THE PRODUCTION OF AROMATIC CARBONATES |
| FR2291967A1 (en) * | 1974-11-25 | 1976-06-18 | Anic Spa | PROCESS FOR PREPARING AROMATIC CARBONATES |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2406561A (en) * | 1943-12-27 | 1946-08-27 | Nasa | Azeotropic distillation of methanol from admixture with acrylic esters |
| US3011954A (en) * | 1958-10-13 | 1961-12-05 | Borden Co | Separation of methanol and methyl acetate |
| CH400107A (en) * | 1961-10-11 | 1965-10-15 | Lonza Ag | Process for the recovery of methanol by saponification of methyl acetate |
| FR1490688A (en) * | 1966-06-22 | 1967-08-04 | Melle Usines Sa | Process for separating the constituents of azeotropic mixtures of methanol and lower aliphatic ester |
-
1977
- 1977-08-10 DE DE19772736063 patent/DE2736063A1/en not_active Withdrawn
-
1978
- 1978-08-02 DE DE7878100571T patent/DE2860326D1/en not_active Expired
- 1978-08-02 EP EP78100571A patent/EP0000880B1/en not_active Expired
- 1978-08-08 IT IT7850655A patent/IT7850655A0/en unknown
- 1978-08-09 JP JP9628178A patent/JPS5448732A/en active Pending
-
1980
- 1980-01-10 US US06/110,942 patent/US4252737A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2528412A1 (en) * | 1974-06-25 | 1976-01-08 | Snam Progetti | PROCESS FOR THE PRODUCTION OF AROMATIC CARBONATES |
| FR2291967A1 (en) * | 1974-11-25 | 1976-06-18 | Anic Spa | PROCESS FOR PREPARING AROMATIC CARBONATES |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0255252A3 (en) * | 1986-07-31 | 1989-02-15 | Texaco Development Corporation | Process for cosynthesis of ethylene glycol and dimethyl carbonate |
| EP0255252A2 (en) * | 1986-07-31 | 1988-02-03 | Texaco Development Corporation | Process for cosynthesis of ethylene glycol and dimethyl carbonate |
| EP0486267A1 (en) * | 1990-11-16 | 1992-05-20 | Hoechst Celanese Corporation | A method for preparing a salt of 4-hydroxystyrene and for preparing 4-tertiary-butoxycarbonyloxystyrene therefrom |
| US8003817B2 (en) | 2007-05-25 | 2011-08-23 | Bayer Materialscience Ag | Process for the preparation of diaryl carbonates or arylalkyl carbonates from dialkyl carbonates |
| DE102007044033A1 (en) | 2007-09-14 | 2009-03-19 | Bayer Materialscience Ag | Process for the preparation of diaryl or alkylaryl carbonates from dialkyl carbonates |
| EP2062868A2 (en) | 2007-11-20 | 2009-05-27 | Bayer MaterialScience AG | Process for purifying diaryl carbonates |
| DE102007055266A1 (en) | 2007-11-20 | 2009-05-28 | Bayer Materialscience Ag | Process for the purification of diaryl carbonates |
| DE102008029514A1 (en) | 2008-06-21 | 2009-12-24 | Bayer Materialscience Ag | Process for the preparation of diaryl carbonates from dialkyl carbonates |
| US9040732B2 (en) | 2008-06-21 | 2015-05-26 | Bayer Materialscience Ag | Process for preparing diaryl carbonates from dialkyl carbonates |
| US8952189B2 (en) | 2009-04-08 | 2015-02-10 | Bayer Materialscience Ag | Process for preparing diaryl carbonates or alkyl aryl carbonates from dialkyl carbonates |
| EP2239249A1 (en) | 2009-04-08 | 2010-10-13 | Bayer MaterialScience AG | Method for producing diarylcarbonates or arylalkylcarbonates from dialkylcarbonates |
| DE102009016853A1 (en) | 2009-04-08 | 2010-10-14 | Bayer Materialscience Ag | Process for the preparation of diaryl or alkylaryl carbonates from dialkyl carbonates |
| DE102009053370A1 (en) | 2009-11-14 | 2011-05-19 | Bayer Materialscience Ag | Process for the purification of dialkyl carbonates |
| EP2322261A2 (en) | 2009-11-14 | 2011-05-18 | Bayer MaterialScience AG | Method for cleaning dialkyl carbonates |
| EP2457891A1 (en) | 2010-10-08 | 2012-05-30 | Bayer MaterialScience AG | Method for manufacturing diaryl carbonates from dialkyl carbonates |
| US8304509B2 (en) | 2010-10-08 | 2012-11-06 | Bayer Intellectual Property Gmbh | Process for preparing diaryl carbonates from dialkyl carbonates |
| DE102010042937A1 (en) | 2010-10-08 | 2012-04-12 | Bayer Materialscience Aktiengesellschaft | Process for the preparation of diaryl carbonates from dialkyl carbonates |
| EP2650278A1 (en) | 2012-04-11 | 2013-10-16 | Bayer MaterialScience AG | Method for manufacturing diaryl carbonates from dialkyl carbonates |
| WO2014095776A1 (en) | 2012-12-18 | 2014-06-26 | Bayer Materialscience Ag | Method for producing diaryl carbonate |
| US9765012B2 (en) | 2012-12-18 | 2017-09-19 | Covestro Deutschland Ag | Method for producing diaryl carbonate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5448732A (en) | 1979-04-17 |
| DE2736063A1 (en) | 1979-02-22 |
| IT7850655A0 (en) | 1978-08-08 |
| EP0000880B1 (en) | 1981-01-14 |
| DE2860326D1 (en) | 1981-03-12 |
| US4252737A (en) | 1981-02-24 |
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