Patents by Inventor Anton Schoengen
Anton Schoengen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6180817Abstract: A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crude ester with a distillation column containing structured packing and using a lower bottom temperature, product yield is increased, and the process is made more economical.Type: GrantFiled: September 16, 1998Date of Patent: January 30, 2001Assignee: Huels AktiengesellschaftInventors: Udo Lenz, Ulrich Neutzler, Anton Schoengen, Reinhard Sigg
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Patent number: 6096171Abstract: A process for purifying a crude ester containing dimethyl terephthalate, includes flash distilling a mixture including para-xylene and methyl para-toluate, and separating the crude ester into fractions. By separating the crude ester with a distillation column containing structured packing and using a lower bottom temperature, product yield is increased, and the process is made more economical.Type: GrantFiled: May 13, 1998Date of Patent: August 1, 2000Assignee: Huels AktiengesellschaftInventors: Udo Lenz, Ulrich Neutzler, Anton Schoengen, Reinhard Sigg
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Patent number: 5891410Abstract: A process is disclosed for the purification of an off-gas which originates from the oxidation of xylene with air in the Witten process for the preparation of dimethyl terephthalate by subjecting the off-gas to a partial condensation step to remove constituents such as dimethyl terephthalate and xylene; then contacting the off-gas with a solvent such as para-toluic acid or a mixture of para-toluic acid and methyl benzoate so as to remove contaminants such as para-xylene out of the off-gas; then contacting the off-gas with a solvent such as methyl benzoate to remove contaminants such as methyl para-toluate out of the off-gas; then contacting the off-gas with water so as to remove contaminants such as methanol out of the off-gas, and then combusting the off-gas.Type: GrantFiled: February 24, 1993Date of Patent: April 6, 1999Assignee: Huls AktiengesellschaftInventors: Rudolf Modic, Hermann-Josef Korte, Anton Schoengen, Johann-Heinrich Schroeder, Jorg Porschen
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Patent number: 5869736Abstract: A process is provided for the oxidation of p-xylene and methyl p-tolulate with oxygen-containing gases in the Witten-Hercules process for preparing dimetyl terephthalate in at least two sequentially arranged stages and in the presence of a catalyst, wherein the process involves oxidizing p-xylene and methyl p-toluate with oxygen containing gases in at least two sequential stages in the presence of a catalyst, wherein the at least two sequential stages include at least one p-xylene rich stage and at least one methyl p-toluate rich stage, wherein at least one of the following steps (a) and (b) occurs:(a) in the at least one p-xylene rich stage at least a portion of p-xylene present is oxidized in the presence of 5 to 30% by mass of methyl p-toluate, based on a total amount of oxidation mixture in the at least one p-xylene rich stage; or(b) in the methyl p-toluate rich stage at least one of methyl p-toluate or p-toluic acid is oxidized in the presence of 2 to 30% by mass of p-xylene, based on a total amount of mType: GrantFiled: October 14, 1997Date of Patent: February 9, 1999Assignee: Huels AktiengesellschaftInventors: Stefan Jelko, Anton Schoengen, Hermann-Josef Korte, Gerhard Franz, Hans-Guenther Srebny, Thomas Jostmann, Frank Steding
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Patent number: 5852201Abstract: A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crude ester with a distillation column containing structured packing and using a lower bottom temperature, product yield is increased, and the process is made more economical.Type: GrantFiled: January 17, 1997Date of Patent: December 22, 1998Assignee: Huels AktiengesellschaftInventors: Udo Lenz, Ulrich Neutzler, Anton Schoengen, Reinhard Sigg
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Patent number: 5679848Abstract: A process for the preparation of terephthalic acid (TA) from pure dimethyl terephthalate (DMT) and/or DMT intermediate product by hydrolysis in a countercurrent reactor at a conversion of greater than 99% and crystallization to give the solid product, characterized in that the sum of the stripping steam (S) and reaction water (W) satisfies the relationshipL.ltoreq.S+W.ltoreq.2L,wherein (L) represents the amount of water necessary to keep the terephthalic acid (TA) produced largely in solution during the reaction and in the bottom of the reactor, and the terephthalic acid produced is crystallized in a crystallization which is free from washing stages.Type: GrantFiled: January 18, 1996Date of Patent: October 21, 1997Assignee: Huels AktiengesellschaftInventors: Hermann-Josef Korte, Anton Schoengen, Christoph Schwarz, Thomas Jostmann
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Patent number: 5614159Abstract: In the purification of an off-gas stream originating from a process of oxidizing a liquid mixture of para-xylene with methyl para-toluate with an oxygen-containing gas under pressure, the off-gas being contaminated with at least one of an aliphatic and an aromatic impurity, which comprises expanding the off-gas stream in an expansion turbine for generating mechanical or electrical energy so as to obtain an at least partial recovery of the energy contained in the off-gas, the improvement comprising subjecting the off-gas to at least one absorption step under pressure to remove at least one component from the off-gas and subjecting the resultant off-gas stream to combustion under a pressure of more than 3 bar prior to expanding the off-gas stream in the expansion turbine.Type: GrantFiled: April 10, 1995Date of Patent: March 25, 1997Assignee: Huls Aktiengesellschaft, Werk TroisdorfInventors: Rudolf Modic, Hermann-Josef Korte, Anton Schoengen, Johann-Heinrich Schroeder, J org Porschen
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Process for the production of DMT-intermediate product of specific purity and pure terephthalic acid
Patent number: 5338882Abstract: The invention relates to a process for the production of a DMT intermediate product as well as its working up to fibregrade DMT and to medium pure and pure terephthalic acid.Type: GrantFiled: November 4, 1993Date of Patent: August 16, 1994Assignee: Huls AktiengesellschaftInventors: Hermann-Josef Korte, Anton Miletic, Hans U. Neutzler, Anton Schoengen, Johann H. Schroeder, Ralf Wirges -
Patent number: 5286896Abstract: The invention relates to a process for the production of a DMT intermediate product as well as its working up to fibregrade DMT and to medium pure and pure terephthalic acid.Type: GrantFiled: August 15, 1991Date of Patent: February 15, 1994Assignee: Huls AktiengesellschaftInventors: Hermann-Josef Korte, Anton Miletic, Hans U. Neutzler, Anton Schoengen, Johann H. Schroeder, Ralf Wirges
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Patent number: 4755295Abstract: A multistage arrangement for countercurrent separation of suspended solids, such as crystals, by means of hydro-cyclone groups connected in series and corresponding pumps and pump wells. For operating with relatively small expenditures with respect to apparatus under high pressures and at high temperatures within a certain, limited temperature range, the hydro-cyclone groups, the pump wells with pumps projecting into the pump wells, and the essential parts or regions of the lines are placed in a common pressure-proof and heat-insulated chamber. In addition, for removing coarser crystallizations and solid particles, an upstream classifier also accommodated in the chamber may be provided. The multistage arrangement can be used in a process for the production of terephthalic acid from dimethyl-terephthalate as the intermediate product, and in a process for the hydrogenation of coal.Type: GrantFiled: July 31, 1987Date of Patent: July 5, 1988Assignees: Amberger Kaolinwerke GmbH, Dynamit Nobel AGInventors: Friedrich Donhauser, Anton Schoengen, Johann H. Shroeder, Jorg Porschen
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Patent number: 4707274Abstract: A multistage arrangement for countercurrent separation of suspended solids, such as crystals, by means of hydro-cyclone groups connected in series and corresponding pumps and pump wells. For operating with relatively small expenditures with respect to apparatus under high pressures and at high temperatures within a certain, limited temperature range, the hydro-cyclone groups, the pump wells with pumps projecting into the pump wells, and the essential parts or regions of the lines are placed in a common pressure-proof and heat-insulated chamber. In addition, for removing coarser crystallizations and solid particles, an upstream classifier also accommodated in the chamber may be provided. The multistage arrangement can be used in a process for the production of terephthalic acid from dimethyl-terephthalate as the intermediate product, and in a process for the hydrogenation of coal.Type: GrantFiled: December 31, 1986Date of Patent: November 17, 1987Assignees: Amberger Kaolinwerke GmbH, Dynamit Nobel AGInventors: Friedrich Donhauser, Anton Schoengen, Johann H. Schroeder, Jorg Porschen
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Patent number: 4642377Abstract: A process for the production of terephthalic acid from p-xylene and methanol by way of the dimethyl terephthalate obtained by oxidation, in the liquid phase with atmospheric oxygen in the presence of dissolved heavy metal compounds as the catalyst, of a mixture of p-xylene and a fraction containing predominantly methyl p-toluate, which fraction is recycled into the oxidation, to obtain an oxidation product containing primarily p-toluic acid and monomethyl terephthalate at a temperature of 140.degree.-170.degree. C. and under a pressure of 4-8 bar; by esterification of the oxidation product in a reactor with liquid and subsequently vaporized methanol brought to an elevated pressure, at a temperature of 220.degree.-280.degree. C.Type: GrantFiled: March 4, 1985Date of Patent: February 10, 1987Assignee: Dynamit Nobel AktiengesellschaftInventors: Rudolf Modic, Jorg Porschen, Anton Schoengen, Ralf Wirges
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Patent number: 4642369Abstract: A process for the production of dimethyl terephthalate from p-xylene and methanol by oxidation in a reactor, in the liquid phase with atmospheric oxygen in the presence of dissolved heavy metal compounds as a catalyst, of a mixture of p-xylene and a fraction containing predominantly methyl p-toluate, which fraction is recycled into the oxidation, to obtain an oxidation product containing primarily p-toluic acid and monomethyl terephthalate, at a temperature of 140.degree.-170.degree. C. and under a pressure of 4-8 bar; by esterification of the oxidation product with liquid and subsequently vaporized methanol brought to an elevated pressure, at a temperature of 220.degree.-280.degree. C.Type: GrantFiled: March 4, 1985Date of Patent: February 10, 1987Assignee: Dynamit Nobel AktiengesellschaftInventors: Rudolf Modic, Jorg Porschen, Anton Schoengen, Ralf Wirges
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Patent number: 4578501Abstract: A process for the production of a crude dimethyl terephthalate suitable for hydrolyzing into a fiber grade terephthalic acid involves separating a crude ester obtained from the production of dimethyl terephthalate by the Witten process by vacuum distillation at elevated pressure in a three-column series arranged distillation system. In the first distillation column of the system the crude is separated into a methyl p-toluate-rich fraction as head product; in a second column of the series, into a fraction rich in methyl ester of terephthalaldehydic acid as head product; and in a third distillation column, a crude dimethyl terephthalate fraction. The crude dimethyl terephthalate fraction has a methyl ester of terephthalaldehydic acid content of 0.01-0.1% by weight as a head product.Type: GrantFiled: April 18, 1980Date of Patent: March 25, 1986Assignee: Dynamit Nobel AktiengesellschaftInventors: Anton Schoengen, Georg Schreiber, Heinz Schroeder
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Patent number: 4302595Abstract: In a process for the preparation of fiber-grade terephthalic acid from intermediate stage crude dimethyl terephthalate, the crude dimethyl terephthalate, which has a limited content of intermediate oxidation products including a content of terephthalaldehydic acid methyl ester of up to 0.1% by weight based on the weight of the crude dimethyl terephthalate, is hydrolyzed with water at a weight ratio of the crude dimethyl terephthalate to water of between 3:1 and 0.1:1 and at a temperature between 140.degree. C. and 350.degree. C. and under a pressure required to maintain a liquid phase (e.g., from 6 to 200 bars) to produce a reaction mixture containing crystalline fiber-grade terephtalic acid and thereafter the terephthalic acid is recovered from the reaction mixture.Type: GrantFiled: September 27, 1979Date of Patent: November 24, 1981Assignee: Dynamit Nobel AktiengesellschaftInventors: Anton Schoengen, Georg Schreiber, Heinz Schroeder
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Patent number: 4269805Abstract: A multi-stage reactor for the oxidation of alkyl aromatics, e.g. a mixture of p-xylene and methyl p-toluate in a liquid phase reaction mixture with oxygen-containing gases, e.g. air, under elevated pressure and at an elevated temperature in the presence of an oxidation catalyst is in the form of an elongated closed tank with a multiplicity of neighboring reaction chambers arranged successively from one end to the other end of the tank for containing the liquid reaction mixture at predetermined levels in each chamber. The reactor is provided with an oxidizing gas feed system for introducing an oxidizing gas into each chamber, feed means for introducing at least one alkyl aromatic reactant and an oxidation catalyst into at least one of the reaction chambers, a vapor-collecting conduit means in communication with each of said chambers for removing reaction gas from each of said chambers, and a discharge means for removing the oxidized product from the reactor tank.Type: GrantFiled: February 12, 1979Date of Patent: May 26, 1981Assignee: Dynamit Nobel AktiengesellschaftInventors: Anton Schoengen, Heinrich Schroeder