DE102004002962A1 - Installation for preparing terephthalic acid, comprises oxidation reactor and horizontal decanter-centrifuge, for dewatering and purifying crude product - Google Patents
Installation for preparing terephthalic acid, comprises oxidation reactor and horizontal decanter-centrifuge, for dewatering and purifying crude product Download PDFInfo
- Publication number
- DE102004002962A1 DE102004002962A1 DE102004002962A DE102004002962A DE102004002962A1 DE 102004002962 A1 DE102004002962 A1 DE 102004002962A1 DE 102004002962 A DE102004002962 A DE 102004002962A DE 102004002962 A DE102004002962 A DE 102004002962A DE 102004002962 A1 DE102004002962 A1 DE 102004002962A1
- Authority
- DE
- Germany
- Prior art keywords
- terephthalic acid
- acetic acid
- centrifuge
- decanter centrifuge
- crude terephthalic
- 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.)
- Ceased
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
- C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
- B01J8/002—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor with a moving instrument
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
- B01J8/10—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles moved by stirrers or by rotary drums or rotary receptacles or endless belts
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/47—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00002—Chemical plants
- B01J2219/00004—Scale aspects
- B01J2219/00006—Large-scale industrial plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/40—Regeneration or reactivation
- B01J31/4015—Regeneration or reactivation of catalysts containing metals
- B01J31/4023—Regeneration or reactivation of catalysts containing metals containing iron group metals, noble metals or copper
- B01J31/403—Regeneration or reactivation of catalysts containing metals containing iron group metals, noble metals or copper containing iron group metals or copper
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- 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
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
-
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Die Erfindung betrifft eine Anlage und ein Verfahren zur Herstellung von Terephthalsäure.The The invention relates to a plant and a method for the production of terephthalic acid.
Terephthalsäure wird durch Oxidation von para-Xylol zu Terephthalsäure in einem Co/Mn-katalysatorhaltigen Lösungsmittel, welches Essigsäure umfasst, hergestellt. Nach der Oxidation wird Terephthalsäure als roher Feststoff von dem Nebenprodukt und katalysatorhaltigen flüssigen Reaktionsmedium abgetrennt und in einer frische Essigsäure umfassenden Flüssigkeit gelöst.Terephthalic acid is by oxidation of para-xylene to terephthalic acid in a Co / Mn catalyst-containing Solvent, which comprises acetic acid, produced. After oxidation, terephthalic acid is used as the crude solid of separated by-product and catalyst-containing liquid reaction medium and in a fresh acetic acid comprehensive fluid solved.
Aus der verunreinigten Essigsäurelösung, die als Mutterlauge anfällt, werden zunächst die suspendierten Feststoffe abgetrennt. Anschließend werden die löslichen Nebenprodukte extraktiv und destillativ abgetrennt und ausgeschleust, sowie die zurückgewonnene Essigsäurelösung und der Katalysator wieder in den Oxidationsprozess zurückgeführt. Das im frischen Lösungsmittel suspendierte Terephthalsäureprodukt wird einem Nachoxidations- und Kristallisationsprozess zugeführt. Anschließend wird das kristalline Produkt entwässert und getrocknet.Out the contaminated acetic acid solution, the obtained as mother liquor, be first separated the suspended solids. Then be the soluble ones Byproducts separated by distillation and removed by distillation, as well as the recovered Acetic acid solution and the catalyst is recycled back into the oxidation process. The in fresh solvent suspended terephthalic acid product is fed to a post-oxidation and crystallization process. Subsequently, the drained crystalline product and dried.
Die Trennung von Terephthalsäure als roher Feststoff von dem flüssigen Reaktionsmedium erfolgt üblicherweise in einer Zentrifuge. Dabei wird die als Feststoff entstehende Terephthalsäure von der Essigsäurelösung getrennt, um zum einen den darin gelösten Katalysator zurückzugewinnen und zum anderen Nebenprodukte zu eliminieren, die als Farbbildner im Endprodukt unerwünscht sind. Üblicherweise wird eine Waschzentrifuge mit vertikaler Welle und mit vorgeschalteten rotierenden Filtern verwendet, die ein Verstopfen der Rotordüsen der Zentrifuge durch eine mögliche Klumpenbildung vermeiden sollen. In der Waschzentrifuge findet der Flüssigkeitsaustausch von beladener Essigsäurelösung durch saubere Essigsäure statt. Die vom Katalysator und Verunreinigungen befreite Terephthalsäure verlässt die Zentrifuge und gelangt in den Niederschlagsbehälter. Die mit Katalysator und Verunreinigungen beladene Essigsäurelösung gelangt als Mutterlauge in den Überlaufbehälter zur Rückgewinnung des Katalysators und zum Ausschleusen der als suspendierte Feststoffe vorliegenden Verunreinigungen. Dies erfolgt in einer Kerzenfiltereinheit. Anschließend werden die löslichen Nebenprodukte extraktiv und destillativ abgetrennt und ausgeschleust, sowie die zurückgewonnene Essigsäurelösung und der Katalysator in den Oxidationsprozess zurückgeführt. Der Feststoffanteil des Feedstromes und des Stromes an gereinigter Terephthalsäure aus dem Niederschlagsbehälter ist ungefähr gleich groß. Als Abreicherung wird das Verhältnis der Mengen an Katalysator und Verunreinigungen im Überlauf der Zentrifuge und Katalysator und Verunreinigungen im Einsatz zur Zentrifuge definiert. Diese Art der Waschzentrifugen mit vertikaler Welle sind durch ihre Konstruktion und ihre Verfügbarkeit in der Kapazität nach oben begrenzt. Dies macht eine Anlagenvergrößerung teuer und unwirtschaftlich. Außerdem erschwert eine solche Konfiguration den Betrieb einer Anlage erhöhter Kapazität.The Separation of terephthalic acid as a crude solid from the liquid Reaction medium usually takes place in a centrifuge. In this case, the terephthalic acid formed as a solid from the acetic acid solution separated, on the one hand the solved in it Recover catalyst and secondly to eliminate by-products as color formers undesirable in the final product are. Usually will a washing centrifuge with vertical shaft and with upstream rotating filters used to clog the rotor nozzles of the Centrifuge by a possible To avoid clumping. In the washing centrifuge finds the liquid exchange of laden acetic acid solution by clean acetic acid instead of. The freed from the catalyst and impurities terephthalic acid leaves the Centrifuge and enters the precipitation tank. The with catalyst and Impurities laden acetic acid solution passes as mother liquor in the overflow tank for reclamation the catalyst and for discharging as suspended solids present impurities. This is done in a candle filter unit. Subsequently become the soluble ones Byproducts separated by distillation and removed by distillation, as well as the recovered Acetic acid solution and the catalyst is recycled to the oxidation process. The solids content of Feed stream and the stream of purified terephthalic acid the precipitation tank it's about same size. As depletion is the ratio the amounts of catalyst and impurities in the overflow the centrifuge and catalyst and impurities in use for Centrifuge defined. This type of washing centrifuges with vertical Wave are up in capacity due to their construction and their availability limited. This makes an asset enlargement expensive and uneconomical. Furthermore such a configuration makes it difficult to operate a plant of increased capacity.
Der Erfindung liegt die Aufgabe zugrunde, das Verfahren zur Herstellung von Terephthalsäure kostengünstiger bereitzustellen, wobei die Anlage leichter und mit weniger Investitionsbedarf an Kapazitätsänderungen anzupassen ist.Of the Invention is based on the object, the process for the preparation of terephthalic acid cheaper to provide, making the plant easier and with less investment needs on capacity changes to adapt.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass einem Reaktor zur Herstellung von Roh-Terephthalsäure nachfolgend eine horizontale Dekanter-Zentrifuge zur Entwässerung und Reinigung der Roh-Terephthalsäure zugeordnet ist.According to the invention Task solved by that following a reactor for the production of crude terephthalic acid assigned a horizontal decanter centrifuge for drainage and purification of crude terephthalic acid is.
Durch die Entwässerung der Roh-Terephthalsäure in der Dekanter-Zentrifuge kann die Dekanter-Zentrifuge in der Größe kompakter ausgelegt werden, als die bekannten Waschzentrifugen nach dem Stand der Technik. Der Austausch der beladenen Essigsäure mit frischer Essigsäure wird bei diesem Verfahren in dem nachfolgenden Niederschlagsbehälter durchgeführt.By the drainage of crude terephthalic acid in the decanter centrifuge, the decanter centrifuge can be more compact in size be interpreted as the known washing centrifuges by the state of the technique. The replacement of the loaded acetic acid with fresh acetic acid is performed in this process in the subsequent precipitation tank.
Alternativ kann die frische Essigsäure direkt am Produktaustritt der Dekanter-Zentrifuge eingeleitet werden. Hierbei wird die entwässerte Roh-Terephthalsäure mit der frischen Essigsäure angemischt. Ein weiterer Vorteil ergibt sich daraus, dass die nach dem Stand der Technik vor der Waschzentrifuge angeordneten rotierenden Filter entfallen. Durch die Reduzierung der Anlagenkomponenten wird die Bedienung und Regelung des Systems erheblich vereinfacht. Außerdem werden die Rohrleitungssysteme und Instrumentierung vereinfacht und der Platzbedarf reduziert.alternative can the fresh acetic acid be introduced directly at the product outlet of the decanter centrifuge. This is the dehydrated Crude terephthalic acid with the fresh acetic acid mixed. Another advantage stems from the fact that after the Prior art arranged in front of the washing centrifuge rotating Filter omitted. By reducing the plant components is the operation and control of the system considerably simplified. In addition, will the piping systems and instrumentation simplified and the Space required reduced.
Eine Dekanter-Zentrifuge arbeitet im Gegensatz zu Waschzentrifugen mit einem Vollmantel, der um eine horizontale oder vertikale Achse rotiert und einen spiralförmigen Schneckenförderer enthält, um ein zugeführtes Feststoff-Flüssigkeits-Gemisch in die festen und flüssigen Bestandteile zu trennen. Alternativ kann eine Dekanter-Zentrifuge auch mit einem Siebvollmantel arbeiten, wobei die Feststoffe dann vor ihrem Austritt von dem Förderer über einen zusätzlich perforierten Siebabschnitt des Vollmantels gedrückt werden.A Decanter centrifuge works in contrast to washing centrifuges a solid sheath that rotates about a horizontal or vertical axis and a spiral screw conveyor contains to a fed Solid-liquid mixture in the solid and liquid Separate ingredients. Alternatively, a decanter centrifuge also work with a Siebvollmantel, the solids then before their exit from the sponsor via a additionally perforated sieve section of the full-coat pressed.
Ausgestaltungsmöglichkeiten des Verfahrens werden mit Hilfe der Zeichnung beispielhaft erläutert. Dabei zeigtdesign options of the method are exemplified with the aid of the drawing. there shows
In
In
der Waschzentrifuge (
Bei
der Trennung der Medien in der Waschzentrifuge (
Beim
erfindungsgemäßen Verfahren
nach
Dabei
beträgt
der Druck in der Dekanter-Zentrifuge (
In
der Dekanter-Zentrifuge (
Aus
der Dekanter-Zentrifuge (
Bei
der Trennung der Medien in der Dekanter-Zentrifuge (
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004002962A DE102004002962A1 (en) | 2004-01-21 | 2004-01-21 | Installation for preparing terephthalic acid, comprises oxidation reactor and horizontal decanter-centrifuge, for dewatering and purifying crude product |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004002962A DE102004002962A1 (en) | 2004-01-21 | 2004-01-21 | Installation for preparing terephthalic acid, comprises oxidation reactor and horizontal decanter-centrifuge, for dewatering and purifying crude product |
Publications (1)
Publication Number | Publication Date |
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DE102004002962A1 true DE102004002962A1 (en) | 2005-08-18 |
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DE102004002962A Ceased DE102004002962A1 (en) | 2004-01-21 | 2004-01-21 | Installation for preparing terephthalic acid, comprises oxidation reactor and horizontal decanter-centrifuge, for dewatering and purifying crude product |
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DE (1) | DE102004002962A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1756030A1 (en) * | 2004-06-18 | 2007-02-28 | Eastman Chemical Company | Improved filtrate preparation process for terephthalic acid filtrate treatment |
WO2007103023A1 (en) * | 2006-03-01 | 2007-09-13 | Eastman Chemical Company | Methods and apparatus for isolating carboxylic acid |
US7847121B2 (en) | 2006-03-01 | 2010-12-07 | Eastman Chemical Company | Carboxylic acid production process |
US7863483B2 (en) | 2006-03-01 | 2011-01-04 | Eastman Chemical Company | Carboxylic acid production process |
CN111569799A (en) * | 2020-03-31 | 2020-08-25 | 南京延长反应技术研究院有限公司 | External micro-interface unit enhanced reaction system and process for producing PTA (pure terephthalic acid) by PX (para-xylene) |
-
2004
- 2004-01-21 DE DE102004002962A patent/DE102004002962A1/en not_active Ceased
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1756030A1 (en) * | 2004-06-18 | 2007-02-28 | Eastman Chemical Company | Improved filtrate preparation process for terephthalic acid filtrate treatment |
EP1756030A4 (en) * | 2004-06-18 | 2008-04-23 | Eastman Chem Co | Improved filtrate preparation process for terephthalic acid filtrate treatment |
WO2007103023A1 (en) * | 2006-03-01 | 2007-09-13 | Eastman Chemical Company | Methods and apparatus for isolating carboxylic acid |
US7462736B2 (en) | 2006-03-01 | 2008-12-09 | Eastman Chemical Company | Methods and apparatus for isolating carboxylic acid |
US7847121B2 (en) | 2006-03-01 | 2010-12-07 | Eastman Chemical Company | Carboxylic acid production process |
US7863483B2 (en) | 2006-03-01 | 2011-01-04 | Eastman Chemical Company | Carboxylic acid production process |
CN111569799A (en) * | 2020-03-31 | 2020-08-25 | 南京延长反应技术研究院有限公司 | External micro-interface unit enhanced reaction system and process for producing PTA (pure terephthalic acid) by PX (para-xylene) |
CN111569799B (en) * | 2020-03-31 | 2023-03-10 | 南京延长反应技术研究院有限公司 | External micro-interface unit enhanced reaction system and process for producing PTA (pure terephthalic acid) by PX (para-xylene) |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8127 | New person/name/address of the applicant |
Owner name: LURGI GMBH, 60439 FRANKFURT, DE |
|
8131 | Rejection | ||
R081 | Change of applicant/patentee |
Owner name: AIR LIQUIDE GLOBAL E&C SOLUTIONS GERMANY GMBH, DE Free format text: FORMER OWNER: LURGI GMBH, 60439 FRANKFURT, DE Effective date: 20140505 |