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公开(公告)号：US5294305A
公开(公告)日：1994-03-15
申请号：US57557
申请日：1993-05-06
IPC分类号： B01D15/08 , B01D1/14 , B01D3/14 , B01D15/04 , B01J39/04 , B01J47/04 , C07C27/28 , C07C29/76 , C07C29/80 , C07C31/20 , C07C41/36 , C07C43/10 , C07C67/03 , C07C67/08 , C07C69/82 , C08G63/183 , C08G63/78 , C08G63/88 , C07C29/74
CPC分类号： C07C29/80 , B01J39/04 , B01J47/04 , C07C29/76 , Y10S203/90
摘要： The present invention is an improved process for the recovery of ethylene glycol from spent glycol generated in the manufacture of polyethylene terephthalate. The spent glycol typically consists of metal oxide catalyst residues, low molecular weight terephthalate oligomers, diethylene glycol and other trace impurities. The improved process of the present invention is based on the principle that elevating the temperature of the spent glycol increases the solubility of the low molecular weight oligomers so that the low molecular weight oligomers can be dissolved in the ethylene glycol and further that the spent glycol at an elevated temperature may be passed through an ion exchange bed to remove metal oxide catalysts, color forming impurities and other trace impurities.
摘要翻译： 本发明是一种用于在制造聚对苯二甲酸乙二醇酯时产生的从二醇中回收乙二醇的改进方法。 废二醇通常由金属氧化物催化剂残留物，低分子量对苯二甲酸酯低聚物，二甘醇和其它痕量杂质组成。 本发明的改进方法是基于提高废二醇的温度来提高低分子量低聚物的溶解度的原理，使得低分子量低聚物可以溶解在乙二醇中，进一步地，用过的二醇在 升高的温度可以通过离子交换床去除金属氧化物催化剂，成色杂质和其它痕量杂质。
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公开(公告)号：US5785857A
公开(公告)日：1998-07-28
申请号：US740703
申请日：1996-10-31
CPC分类号： B01J47/002 , B01J39/04
摘要： A mobile process to reclaim spent aqueous glycol solutions used as heat transfer fluids and which contains deleterious contaminants, oil/grease, corrosion products, and additives such as buffers and corrosion inhibitors. Particulate contaminates and oil/grease are removed by passing the solution through an ultrafiltration membrane. The dissolved contaminants are removed by passing through a series of ion exchange resin (IER) vessels. The reclaimed glycol solution is reused after replacing the required additives. One embodiment provides for central processing of the filtration and absorption media housed in a mobile enclosure, such as a trailer. The mobile trailer may be used at various collection sites for cleaning and reprocessing spent glycols. After the media are spent, the mobile trailer is returned to a central processing facility for regeneration of the filtration and absorption media. The waste produced by the regeneration is concentrated at a single treatment and disposal facility.
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