Classifications

• • 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
  • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
  • B01J37/12—Oxidising
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C46/00—Preparation of quinones
  • C07C46/02—Preparation of quinones by oxidation giving rise to quinoid structures
  • C07C46/04—Preparation of quinones by oxidation giving rise to quinoid structures of unsubstituted ring carbon atoms in six-membered aromatic rings
• • 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
• • 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

Definitions

• the invention relates to a process for the oxidation of reactive aromatics with molecular oxygen in the presence of a catalyst consisting of a cobalt compound in carboxylic acid and optionally with the addition of a manganese and a bromine compound which are suitable as co-catalysts.
• Reactive aromatics are those aromatic compounds that have one or more reactive carbon-hydrogen bonds. These can either be in the methyl groups of a methyl-substituted aromatic or in an aromatic nucleus.
• methyl-substituted reactive aromatics are toluene, xylenes, monoalkylnaphthalenes such as 1-methylnaphthalene, or 2-methylnaphthalene, dimethylnaphthalenes such as 1,2-dimethylnaphthalene, 1,3-dimethylnaphthalene, 1,4-dimethylnaphthalene, 1,5-dimethylnaphthalene, 1 , 6-dimethylnaphthalene, 1,7-dimethylnaphthalene, 1,8-dimethylnaphthalene, 2,3-dimethylnaphthalene, 2,6-dimethylnaphthalene or 2,7-dimethylnaphthalene, trimethylnaphthalenes or also methyl derivatives of higher fused aromatics.
• DE-OS 2 107 357 discloses a process for the oxidation of monomethyl or dimethylnaphthalenes with molecular oxygen.
• the oxidation takes place in aqueous, acetic acid solution using a catalyst which is composed of a cobalt, a manganese and a bromine compound.
• DE-OS 2 107 357 also indicates the possibility of recovering unreacted starting material, intermediate oxidation product and catalyst "by removing water” and recirculating them to oxidation treatment by subjecting the remaining mother liquor ".
• the energy is taken into account which is necessary for the evaporation of the water, this procedure is also not economically viable, and it has also been found that it is reused Catalyst solution has lost almost all of its activity, so that a second reaction cycle with the same catalyst no longer results in any significant conversion.
• Oxidation of anthracene fractions with molecular oxygen Oxidation of anthracene fractions with molecular oxygen.
• the oxidation takes place in carboxylic acid solution using a catalyst consisting of a cobalt, a manganese and a
• Bromine compound is composed. There is no information about
• the object was therefore to find a simpler and more economical process for the oxidation of reactive aromatics, which makes it possible to dispense with the removal of larger amounts of solvent by distillation and to be able to use the catalyst solutions repeatedly without an impairing loss of activity occurring.
• the solution to the problem lies in a process for the oxidation of reactive aromatics with molecular oxygen in carboxylic acid solution in the presence of a catalyst consisting of a cobalt compound and optionally with the addition of a manganese and a bromine compound suitable as cocatalyst, characterized in that after each reaction cycle the The catalyst is reactivated by treatment with a strong oxidizing agent and the water which is formed in the reaction is removed by distillation.
• the reactive aromatics can be used both as a single substance and in any mixtures with one another. No particular requirements are imposed on their purity, ie the related, non-reactive compounds boiling in about the same temperature range, such as naphthalene, diphenyl, phenanthrene or carbazole, do not interfere with the oxidation reaction. Likewise, removal of sulfur bodies, such as methylthionaphthene or thionaphtha, is not necessary.
• the oxidation of the reactive aromatics is carried out in an acetic acid solution, at least 2.5 parts by weight of acetic acid being used per part by weight of reactive aromatics.
• the acetic acid can contain small amounts of water, since this improves the solubility of the salts used as catalysts.
• the yield of the end product decreases with increasing water content of the reaction solution. It is therefore sufficient the amount of water which is introduced if the salts serving as catalyst with their natural crystal water content are used. In addition, water is formed in the oxidation reaction, which dilutes the acetic acid. It is advisable to remove this water before the next reaction cycle.
• a combination of compounds which contains the three components a cobalt compound (component A), a manganese compound (component B) and bromine or a bromine compound (component C) in certain proportions serves as the catalyst for the oxidation reaction.
• X denotes the amount of cobalt contained in said cobalt compound in parts by weight per 50 parts by weight of reactive aromatics
• Y denotes the amount of manganese contained in the manganese compound in parts by weight per 50 parts by weight of reactive aromatics
• Z the amount Bromine or the bromine contained in the bromine compound in parts by weight per 50 parts by weight of reactive aromatics.
• cobalt and manganese salts of aliphatic carboxylic acids with 1 to 4 carbon atoms e.g. Formic, acetic, propionic, butteric, succinic, cobalt and manganese salts of aromatic carboxylic acids, e.g. Benzoic acid, phthalic acid, naphthalene monocarboxylic acid or naphthalene dicarboxylic acid and inorganic salts of cobalt and manganese, e.g. Oxides, carbonates, basic carbonates, chlorides and bromides.
• cobalt and manganese salts of aliphatic carboxylic acids with 1 to 4 carbon atoms e.g. Formic, acetic, propionic, butteric, succinic, cobalt and manganese salts of aromatic carboxylic acids, e.g. Benzoic acid, phthalic acid, naphthalene monocarboxylic acid or naphthalene dicarboxylic acid and inorgan
• Preferred salts are cobalt (II) and manganese (II) acetot and bromide.
• the use of a cobalt or manganese bromide has the advantage that component C of the catalyst is introduced at the same time.
• the proportional ratio between cobalt, Manganese and bromine to be supplied to the reaction system are not the condition prescribed by the above formula (2). Accordingly, it is necessary to appropriately use amounts of other cobalt and / or manganese compounds other than cobalt and manganese bromide (e.g. cobalt and manganese acetate) together with cobalt and / or manganese bromide and to adjust the proportional ratio among these compounds that X, Y and the conditions prescribed by formulas (1), (2) and (3).
• bromine or a bromine compound can also be used as component C of the catalyst, such as other metal bromides, ammonium bromide, hydrogen bromide or organic bromine compounds such as e.g. Bromoacetic acid or benzyl bromide.
• the aromatics are oxidized by oxygen.
• Molecular oxygen is used, either as pure oxygen or in
• reaction temperature should not exceed 170 ° C, since otherwise the proportion of undesirable by-products that are formed will be too large.
• the reactive aromatics are oxidized by introducing them, acetic acid and the catalyst combination into a pressure vessel and heating them. Before or after heating, oxygen or a gas containing oxygen is blown into the reaction vessel and the selected pressure is maintained throughout the reaction.
• reaction mixtures are expediently put together in such a way that a complete conversion of the reactive aromatics used is just achieved per reaction cycle before the catalyst is blocked. This can be achieved if the catalyst mixture is used in an amount of 10-20% by weight of the aromatic used.
• the reaction is complete when oxygen is no longer taken up.
• the reaction mixture is post-treated with an oxidizing agent.
• the inhibiting by-products are largely oxidatively degraded so that a fresh reaction cycle can take place after the addition of fresh reactive aromatics.
• Suitable oxidizing agents are those with a strong oxidation potential, such as ozone, peracids, peroxidisulfates or chromic acid.
• Potassium permanganate is preferably used, which has the advantage that, apart from non-interfering potassium ions, no further foreign ions get into the reaction mixture since the manganese is already part of the catalyst. It also serves to compensate for catalyst losses.
• the regeneration of the catalyst is expediently carried out at elevated temperature and can advantageously be combined with the removal of the water of reaction by simultaneously distilling off an acetic acid / water or - after the addition of benzene - a benzene / water azeotrope.
• the catalyst is then ready for the second reaction cycle. At least 5 to 10 such cycles can be carried out with a catalyst batch before the catalyst is finally blocked by inactivation as a result of resinification.
• the number of reaction cycles that can be carried out depends essentially on the extent of the increase in viscosity of the reaction mixture. It turns out that mixtures of the reactive aromatics naturally require more frequent processing than the pure aromatics, where side reactions of the companions occur to a lesser extent.
• reaction cycle 1 10 g of 2-methylnaphthalene are again added to the second reaction cycle, gassed with 2 bar of oxygen and heated to 130 ° C. for 2 1/2 hours. Then, as in reaction cycle 1, the catalyst is regenerated with the aid of 0.5 g KMnO 4 and the reaction solution is used again.
• the mixture is cooled to room temperature after the pressurization, the crystal mass is filtered off with suction and the solution is subjected to the usual dewatering and catalyst regeneration after addition of 0.5 g of Co (CH 3 COO) 2 .4H 2 .
• Example 1 1-appliance are containing 100 g of 1-methylnaphthalene in 250 g of acetic acid containing 25 g of Co (CH 3 COO) 2 .4H 2 O and 2.5 g of MnBr 2 .4H 2 O are dissolved in a 1, within 6 hours at 12 gassed with 2 bar oxygen. It is relaxed and cooled to room temperature. The crystal slurry of crude apthoic acid which separates out is suctioned off.
• Part of the remaining naphthoic acid can be extracted with diluent NaOH solution.
• Example 3 Using the procedure analogous to example 2, 50 g of a 95% strength 2,6-dimethylnaphthalene material are subjected to the oxidation in 5 reaction cycles. In each case 10 g of the aromatic compound in a mixture consisting of 50 g of glacial acetic acid, 2.5 g of Co (CH 3 COO) 2 .4H 2 O and 0.5 g MnBr 2 • 4H 2 O at 125 ° C and 4 bar O 2 pressure reacted. The catalyst is reactivated with 0.5 g KMnO 4 in each case.
• Example 4 Using the procedure analogous to example 2, 50 g of a 95% strength 2,6-dimethylnaphthalene material are subjected to the oxidation in 5 reaction cycles. In each case 10 g of the aromatic compound in a mixture consisting of 50 g of glacial acetic acid, 2.5 g of Co (CH 3 COO) 2 .4H 2 O and 0.5 g MnBr 2 • 4H 2 O at
• Example 2 Analogously to Example 1, 50 g of anthracene (95%) and a solution of 150 g of acetic acid, 7.5 g of Co (CH 3 COO) 2 .4 H 2 O and 1.3 g of MnBr 2 ⁇ 4 H 2 O introduced.
• the reaction vessel is then closed, gassed with 2 bar oxygen and heated to 130.degree. During this process, the pressure is regulated to 4 bar via a compensating valve. After a reaction time of 5-6 hours, the mixture is cooled to about 90 ° C. and the pressure is released.

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• 1982
  • 1982-03-03 DE DE19823207572 patent/DE3207572A1/de not_active Withdrawn
  • 1982-03-23 US US06/403,615 patent/US4477380A/en not_active Expired - Fee Related
  • 1982-03-23 DE DE8282900949T patent/DE3261337D1/de not_active Expired
  • 1982-03-23 AT AT82900949T patent/ATE10485T1/de active
  • 1982-03-23 JP JP57501139A patent/JPS58500525A/ja active Granted
  • 1982-03-23 WO PCT/EP1982/000058 patent/WO1982003625A1/de not_active Ceased
  • 1982-03-23 BR BR8207232A patent/BR8207232A/pt unknown
  • 1982-03-23 EP EP82900949A patent/EP0077334B1/de not_active Expired
  • 1982-04-01 IT IT48149/82A patent/IT1148157B/it active
  • 1982-04-06 CS CS822461A patent/CS226447B2/cs unknown
  • 1982-04-20 CA CA000401290A patent/CA1169056A/en not_active Expired
  • 1982-04-22 IN IN451/CAL/82A patent/IN157294B/en unknown
  • 1982-04-22 ES ES511602A patent/ES511602A0/es active Granted
  • 1982-12-20 SU SU823529501A patent/SU1176828A3/ru active
  • 1982-12-20 FI FI824371A patent/FI71119C/fi not_active IP Right Cessation

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