DD299375A7 - PROCESS FOR PREPARING TEREPHTHALIC ACID - Google Patents
PROCESS FOR PREPARING TEREPHTHALIC ACID Download PDFInfo
- Publication number
- DD299375A7 DD299375A7 DD89330988A DD33098889A DD299375A7 DD 299375 A7 DD299375 A7 DD 299375A7 DD 89330988 A DD89330988 A DD 89330988A DD 33098889 A DD33098889 A DD 33098889A DD 299375 A7 DD299375 A7 DD 299375A7
- Authority
- DD
- German Democratic Republic
- Prior art keywords
- terephthalic acid
- residue
- xylene
- cobalt
- manganese
- Prior art date
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zur Herstellung von Terephthalsaeure durch Fluessigphasenoxidation von p-Xylen, bei der besonderen Beruecksichtigung der Behandlung des Rueckstandes. Es soll ein Verfahren zur Herstellung von Terephthalsaeure bei einer Nutzung des Rueckstandes entwickelt werden. Erfindungsgemaesz wird der Rueckstand nach der destillativen Abtrennung der Benzoesaeure und des Phthalsaeureanhydrids bei 480-500C verbrannt, die Oxidasche bei 750-850C 0,1-2 h thermisch nachbehandelt und die unloeslichen Kobalt- und Manganoxide direkt in den Prozesz wieder eingesetzt.{Rueckstand; aromatische Saeuren; Katalysatorionen; Verbrennung; Oxidasche; Prozeszrueckfuehrung}The invention relates to a process for the preparation of terephthalic acid by liquid phase oxidation of p-xylene, with particular regard to the treatment of the residue. The aim is to develop a process for the preparation of terephthalic acid in the use of the residue. According to the invention, the residue after the distillative separation of the benzoic acid and the phthalic anhydride is burned at 480-500 ° C., the oxide ash is thermally treated at 750-850 ° C. for 0.1-2 h and the insoluble cobalt and manganese oxides are used directly in the process. {Residue; aromatic acids; Catalyst ions; Combustion; oxide ash; Prozeszrueckfuehrung}
Description
grundlegend beschrieben.basically described.
dieser Produkte im Lösungsmittel Essigsäure und zur Einhaltung der hohen Reinheit der Terephthalsäure muß ein Teil desThese products in the solvent acetic acid and to maintain the high purity of terephthalic acid must be part of the
werden. Das Lösungsmittel Essigsäure wird in den Prozeß zurückgeführt. Der Destillationsrückstand enthält diebecome. The solvent acetic acid is recycled to the process. The distillation residue contains the
zur Rückgewinnung dieser Wertstoffe entwickelt worden.have been developed for the recovery of these recyclables.
zurückgeführt.recycled.
die Hydroxide bzw. Karbonate der Katalysatorelemente ausgefällt und nach Wasserwäsche die ausgefällten Hydroxide bzw.precipitated the hydroxides or carbonates of the catalyst elements and after washing the precipitated hydroxides or
diese Lösung in den Prozeß zurückgeführt wird.this solution is attributed to the process.
aromatischen Säuren dar.aromatic acids.
Das Ziel der Erfindung besteht in der Erhöhung der Effektivität sowie der Verminderung der Umweltbelastung des Terephthalsäureverfahrens durch den Wiedereinsatz der im Rückstand enthaltenen Katalysatorelemente.The object of the invention is to increase the effectiveness and reduce the environmental impact of the terephthalic acid process by the reuse of the catalyst elements contained in the residue.
Der Erfindung liegt die Aufgabe zugrunde, das Verfahren zur Herstellung von Terephthalsäure durch die Nutzung der im Rückstand enthaltenen Katalysatorelemente, ohne Beeinträchtigung der Effektivität des Flüssigphasenoxidationsprozesses von p-Xylen und der Qualität der Terephthalsäure, zu verbessern.The invention has for its object to improve the process for the production of terephthalic acid by the use of the catalyst elements contained in the residue, without affecting the effectiveness of the liquid-phase oxidation process of p-xylene and the quality of terephthalic acid.
nach Abtrennung der Kobalt- und Manganoxide diese in den Prozeß direkt zurückgeführt werden.after separation of the cobalt and manganese oxides, these are recycled directly to the process.
dieser Metalloxide problemlos.these metal oxides easily.
die Natrium·, Kobalt· und Manganionen enthält, wobei der Gehalt an Kobalt- und Manganoxid 0,106g und Natriumionen von 0,027 g beträgt, wird mit 10 ml Wasser bei 90-100°C 20 min gerührt und die schwarze Suspension bei 4 000 min"15 min zentrifugiert und der Natriumionengehalt im Filtrat mittels Atomabsorptionsspektralphotometrie bestimmt.containing sodium, cobalt and manganese ions, wherein the content of cobalt and manganese oxide is 0.106 g and sodium ions of 0.027 g is stirred with 10 ml of water at 90-100 ° C for 20 min and the black suspension at 4 000 min " Centrifuged for 1 min and the sodium ion content in the filtrate by atomic absorption spectrophotometry determined.
gewaschen, getrocknet und der 4-CBA-Gehalt bestimmt. Der Gehalt an 4CBAbeträgt 0,3Ma.-%.washed, dried and the 4-CBA content determined. The content of 4CBA is 0.3Ma%.
wird der Reaktor auf 212°C aufgeheizt und der Reaktionsansalz von 100g p-Xy lan, 300 g Essigsäure, 0,185g Kobaltacetat ·4Η2Ο, ü,:88g Manganacetat · 4H2O <Jnd 0,205g Natriumbromid unter Druck eingefüllt und unter Rühren Luft durchgeleitet.The reactor is heated to 212 ° C and the Reaktionsansalz of 100g p-Xy lan, 300 g of acetic acid, 0.185 g of cobalt acetate · 4Η 2 Ο, ü,: 88g manganese acetate · 4H 2 O <Jnd and 0.205g sodium bromide filled under pressure and stirring Air passed through.
6% wird die Oxidation durch Aufgabe von Stickstoff unterbrochen.6%, the oxidation is interrupted by abandonment of nitrogen.
gewaschen, getrocknet und der 4-CBA-Gehalt bestimmt.washed, dried and the 4-CBA content determined.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD89330988A DD299375A7 (en) | 1989-07-20 | 1989-07-20 | PROCESS FOR PREPARING TEREPHTHALIC ACID |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD89330988A DD299375A7 (en) | 1989-07-20 | 1989-07-20 | PROCESS FOR PREPARING TEREPHTHALIC ACID |
Publications (1)
Publication Number | Publication Date |
---|---|
DD299375A7 true DD299375A7 (en) | 1992-04-16 |
Family
ID=5611005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DD89330988A DD299375A7 (en) | 1989-07-20 | 1989-07-20 | PROCESS FOR PREPARING TEREPHTHALIC ACID |
Country Status (1)
Country | Link |
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DD (1) | DD299375A7 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6746653B2 (en) * | 2000-02-25 | 2004-06-08 | Degussa Ag | Process for recovering catalyst transition metals from salt-containing reaction mixtures |
-
1989
- 1989-07-20 DD DD89330988A patent/DD299375A7/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6746653B2 (en) * | 2000-02-25 | 2004-06-08 | Degussa Ag | Process for recovering catalyst transition metals from salt-containing reaction mixtures |
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