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1. 发明公开

EP1082286A1 METHOD FOR PREPARING PURIFIED TEREPHTHALIC ACID AND ISOPHTHALIC ACID FROM MIXED XYLENES 有权
标题翻译：纯对苯二酸的制备方法和间苯二甲酸OFF二甲苯混合物
公开(公告)号：EP1082286A1
公开(公告)日：2001-03-14
申请号：EP99923195.4
申请日：1999-05-18
申请人： HFM International, Inc.
发明人： LEE, Fu-Ming , LAMSHING, Wiston , WYTCHERLEY, Randi, Wright
IPC分类号： C07C51/43 , C07C63/24 , C07C63/26
CPC分类号： C07C51/43 , Y02P20/125 , C07C63/24 , C07C63/26
摘要： A method and apparatus for preparing purified terephthalic acid and, optionally, isophthalic acid from mixed xylenes. The method of the present invention purifies the oxidation reactor effluent containing a mixture of terephthalic acid and isophthalic acid as well as minor amounts of 4-carboxybenzaldehyde (4-CBA), 3-carboxybenzaldehyde (3-CBA), and toluic acid isomers, to produce purified terephthalic acid and, optionally purified isophthalic acid in an integrated process.

2. 发明公开

EP1087925A1 METHOD TO REDUCE CARBOXYBENZALDEHYDE ISOMERS IN TEREPHTHALIC ACID OR ISOPHTHALIC ACID 有权
标题翻译：程序CARBOXYBENZALDEHYDISOMEREN作者对苯二甲酸或间的减少
公开(公告)号：EP1087925A1
公开(公告)日：2001-04-04
申请号：EP99925667.0
申请日：1999-05-18
申请人： HFM International, Inc.
发明人： LAMSHING, Wiston , LEE, Fu-Ming , WYTCHERLEY, Randi, Wright
IPC分类号： C07C51/43 , C07C63/26
CPC分类号： C07C51/43 , C07C63/26
摘要： A method for reducing carboxybenzaldehyde isomers in crude terephthalic and/or isophthalic acids is described. Crude TPA or IPA is dissolved in N-methyl pyrrolidone and is subsequently contacted with an oxidant, such as substantially anhydrous hydrogen peroxide, to convert the carboxybenzaldehyde isomer (4-CBA or 3-CBA) to TPA or IPA under moderate temperature and pressure conditions.

3. 发明公开

EP1030829A1 METHOD AND APPARATUS FOR PREPARING PURIFIED TEREPHTHALIC ACID 有权
标题翻译：方法和装置生产纯化对苯二甲酸
公开(公告)号：EP1030829A1
公开(公告)日：2000-08-30
申请号：EP98956315.0
申请日：1998-10-29
申请人： HFM International, Inc.
发明人： LEE, Fu-Ming , LAMSHING, Wiston
IPC分类号： C07C51/42
CPC分类号： C07C51/43 , C07C63/26
摘要： A method and apparatus for purifying crude terephthalic acid from a liquid dispersion thereof also containing impurities selected from unreacted starting materials, solvents, products of side reactions and/or other undesired materials is provided. The method comprises the steps of filtering the dispersion to form a crude terephthalic acid filter cake, dissolving the filter cake in a selective crystallization solvent at an elevated temperature to form a solution, crystallizing purified terephthalic acid from the solution in the crystallization solvent by reducing the pressure and temperature of the solution, and separating the crystallized purified terephthalic acid from the solution. According to the invention, the selective crystallization solvent is non-aqueous, non-corrosive and essentially non-reactive with terephthalic acid. Preferably, the selective crystallization solvent is N-methyl pyrrolidone or dimethyl acetamide. The method and apparatus produces purified terephthalic acid having a purity desired for use in forming polyester resin and other products at an economically attractive rate and at operating condition of reduced severity which require a lower capital investment and simplified processing.

4. 发明公开

EP1075458A1 PROCESS FOR PURIFYING ISOPHTHALIC ACID BY CRYSTALLIZATION 有权
标题翻译：工艺纯间苯二酸结晶的制备
公开(公告)号：EP1075458A1
公开(公告)日：2001-02-14
申请号：EP99921435.6
申请日：1999-04-20
申请人： HFM International, Inc.
发明人： LEE, Fu-Ming , LAMSHING, Wiston , WYTCHERLEY, Randi, Wright
IPC分类号： C07C51/43 , C07C63/24
CPC分类号： C07C51/43 , C07C63/24 , C07C63/26
摘要： Disclosed is a method for preparing isophthalic acid from metaxylene and especially for purifying crude isophthalic acid (IPA) produced in the course of such method, or otherwise, from a liquid dispersion thereof also containing impurities selected from unreacted starting materials, solvents, products of side reactions and/or other undesired materials. The purifying portion of the method comprises the step of: (1) filtering the dispersion to form a crude IPA filter cake; (2) dissolving the filter cake in a selective crystallization solvent at an elevated temperature to form a solution; (3) crystallizing purified IPA from the solution in the crystallization solvent by reducing the temperature, or pressure, or both of the solution; (4) separating the crystallized purified IPA from the solution; and (5) re-dissolving or soaking the washed purified IPA cake at elevated temperature, to remove the final traces of the crystallization solvent and obtain the desirable particle sizes and shape. Preferably, the selective crystallization solvent is N-methyl pyrrolidone.

5. 发明公开

EP1021498A1 AROMATICS SEPARATION PROCESS AND METHOD OF RETROFITTING EXISTING EQUIPMENT FOR SAME 有权
标题翻译：方法用于分离芳烃
公开(公告)号：EP1021498A1
公开(公告)日：2000-07-26
申请号：EP98944662.0
申请日：1998-09-02
申请人： HFM International, Inc.
发明人： GENTRY, Joseph, C. , LEE, Fu-Ming
IPC分类号： C10G53/16 , C10G53/00 , C10G53/06 , C10G21/00
CPC分类号： C10G21/00 , C10G53/00 , C10G53/06 , C10G53/16
摘要： An improved process for the recovery of aromatic compounds from a mixture containing aromatic and non-aromatic compounds and method for retrofitting existing equipment for the same is provided. The improved process comprises the steps of recovering aromatic compounds via parallel operation of a hybrid extractive distillation/liquid-liquid extractor operation and variations thereof. Methods of quickly and economically retrofitting existing recovery process equipment for use with the improved aromatics recovery process are also disclosed.

6. 发明公开

EP0857170A1 METHOD AND APPARATUS FOR PREPARING PURIFIED TEREPHTHALIC ACID 失效
标题翻译：的方法和设备生产纯化对苯二甲酸
公开(公告)号：EP0857170A1
公开(公告)日：1998-08-12
申请号：EP96918139.0
申请日：1996-06-06
申请人： HFM International, Inc.
发明人： LEE, Fu-Ming , SHANG, Wei-Teh, Wade
IPC分类号： C07C51 , C07C63
CPC分类号： C07C51/43 , C07C63/26
摘要： A method and apparatus for purifying crude terephthalic acid from a liquid dispersion thereof also containing impurities selected from unreacted starting materials, solvents, products of side reactions and/or other undesired materials is provided. The method comprises the steps of filtering the dispersion to form a crude terephthalic acid filter cake (F-1), dissolving the filter cake in a selective crystallization solvent at an elevated temperature to form a solution (T-3, T-4), crystallizing purified terephthalic acid from the solution in the crystallization solvent by reducing the temperature of the solution (S-1), and separating the crystallized purified terephthalic acid from the solution (F-2). According to the invention, the selective crystallization solvent is non-aqueous, non-corrosive and essentially non-reactive with terephthalic acid. Preferably, the selective crystallization solvent is N-methyl pyrrolidone. The method and apparatus produces purified terephthalic acid having a purity desired for use in forming polyester resin and other products at an economically attractive rate and at operating conditions of reduced severity which require a lower capital investement and simplified processing.

7. 发明公开

EP1068173A1 RECOVERY OF ACRYLIC ACID FROM PROCESS OR WASTE WATER STREAMS 审中-公开
标题翻译：丙烯酸的流程或废物流回收
公开(公告)号：EP1068173A1
公开(公告)日：2001-01-17
申请号：EP99904541.2
申请日：1999-02-02
申请人： HFM International, Inc.
发明人： LEE, Fu-Ming , GUALY, Ronald, G.
IPC分类号： C07C51/00 , C07C51/42 , C07C51/44
CPC分类号： C07C51/42 , C07C51/44 , C07C57/04
摘要： Disclosed is a method for recovering acrylic acid from process or waste water streams in which the stream is vaporized and contacted with a liquid high boiling solvent for acrylic acid, thereby absorbing acrylic acid into the solvent. Mixed trialkylphosphine oxides are a preferred solvent. Acrylic acid is stripped from the solvent with heat and, optionally, stripping gas. It may be separated from any accompanying materials to produce acrylic acid of high purity.

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