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1. 发明授权

US4707274A Multistage arrangement for countercurrent separation and methods of operating same 失效
公开(公告)号：US4707274A
公开(公告)日：1987-11-17
申请号：US948049
申请日：1986-12-31
申请人： Friedrich Donhauser , Anton Schoengen , Johann H. Schroeder , Jorg Porschen
发明人： Friedrich Donhauser , Anton Schoengen , Johann H. Schroeder , Jorg Porschen
IPC分类号： B04C5/24 , B01D11/02 , C07C51/09 , C07C63/26 , B01D17/038
CPC分类号： B01D11/02 , C07C51/43
摘要： 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.

2. 发明授权

US5286896A Process for the production of DMT-intermediate product of specific purity 失效
标题翻译：生产具有特异纯度的DMT-中间体产品的方法
公开(公告)号：US5286896A
公开(公告)日：1994-02-15
申请号：US761768
申请日：1991-08-15
申请人： Hermann-Josef Korte , Anton Miletic , Hans U. Neutzler , Anton Schoengen , Johann H. Schroeder , Ralf Wirges
发明人： Hermann-Josef Korte , Anton Miletic , Hans U. Neutzler , Anton Schoengen , Johann H. Schroeder , Ralf Wirges
IPC分类号： C07C67/52 , C07C63/26 , C07C67/39 , C07C69/82
CPC分类号： C07C67/39 , C07C67/54
摘要： 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. The DMT intermediate product is moreover produced by combined oxidation of a predominantly para-xylene (p-X) and para-toluic acid methyl ester (p-TE) containing mixture in liquid phase with an oxygen containing gas, esterification of the acids being produced with methanol, distillative or rectificative separation of the esterification products being produced into a p-TE rich fraction I, a fraction II containing more than 99% by weight DMT and its isomers and a high boiling residue fraction III as well as feeding back the p-TE fraction I into the oxidation, with the residue fraction III having a DMT content of 15 to 70% by weight and the DMT fraction II being purified by single solvent recrystallisation in methanol to form the DMT intermediate product to such an extent that the amounts of hydroxymethylbenzoic acid methyl ester (HM-BME) and terephthalic acid methyl ester (TAE) in the DMT intermediate product amount together to less than 200 ppm.
摘要翻译：本发明涉及一种制备DMT中间体产品的方法及其随后对高纯度DMT和高纯度和超纯对苯二甲酸的处理。 DMT中间产物通过主要含有副产物（p-X）和对甲苯酸甲酯（p-TE）的混合物与含氧气体的液相联合氧化来制备。所产生的酸用甲醇酯化，酯化产物分离成富含p-TE的馏分I，含有大于99wt。％的DMT及其异构体和具有高沸点的残余物级分III，并且将p-TE馏分I再循环至氧化。残渣馏分III的DMT含量为15〜70重量％。％，通过在甲醇中简单溶剂重结晶纯化DMT馏分I，得到其中甲基羟基苯甲酸酯（HM-BME）和对苯二甲酸甲酯（TAE）总共低于200ppm的DMT中间产物。随后将DMT中间产物加工成超纯DMT，通过第二次再结晶进行，随后通过在甲醇中洗涤DMT中间体产物进行对苯二甲酸处理，水解，结晶，并在必要时随后在水中洗涤。

3. 发明授权

US5338882A Process for the production of DMT-intermediate product of specific purity and pure terephthalic acid 失效
标题翻译：生产具有特异纯度的DMT-中间产物和纯对苯二甲酸的方法
公开(公告)号：US5338882A
公开(公告)日：1994-08-16
申请号：US145540
申请日：1993-11-04
申请人： Hermann-Josef Korte , Anton Miletic , Hans U. Neutzler , Anton Schoengen , Johann H. Schroeder , Ralf Wirges
发明人： Hermann-Josef Korte , Anton Miletic , Hans U. Neutzler , Anton Schoengen , Johann H. Schroeder , Ralf Wirges
IPC分类号： C07C67/52 , C07C63/26 , C07C67/39 , C07C69/82 , C07C51/09 , C07C51/43
CPC分类号： C07C67/39 , C07C67/54
摘要： 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. The DMT intermediate product is moreover produced by combined oxidation of a predominantly para-xylene (p-X) and para-toluic acid methyl ester (p-TE) containing mixture in liquid phase with an oxygen containing gas, esterification of the acids being produced with methanol, distillative or rectificative separation of the esterification products being produced into a p-TE rich fraction I, a fraction II containing more than 99% by weight DMT and its isomers and a high boiling residue fraction III as well as feeding back the p-TE fraction I into the oxidation, with the residue fraction III having a DMT content of 15 to 70% by weight and the DMT fraction II being purified by single solvent recrystallisation in methanol to form the DMT intermediate product to such an extent that the amounts of hydroxymethylbenzoic acid methyl ester (HM-BME) and terephthalic acid methyl ester (TAE) in the DMT intermediate product amount together to less than 200 ppm.
摘要翻译：本发明涉及一种生产DMT中间产物以及其加工成纤维分级DMT和中纯纯对苯二甲酸的方法。此外，DMT中间体产物通过主要在对二甲苯（pX）和对甲苯甲酸甲酯（p-TE）的液相混合物与含氧气体的组合氧化产生，所述酸与甲醇的酯化反应，产生的酯化产物的蒸馏或精馏分离成富含p-TE的馏分I，含有大于99重量％DMT及其异构体的馏分II和高沸点残渣馏分III，以及将p-TE 馏分I进入氧化，其中残余物馏分III的DMT含量为15至70重量％，DMT馏分II通过在甲醇中的单一溶剂重结晶纯化以形成DMT中间产物，使得羟甲基苯甲酸的量 DMT中间体产物中的酸甲酯（HM-BME）和对苯二甲酸甲酯（TAE）的含量一起低于200ppm。

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