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公开(公告)号:US20050096481A1
公开(公告)日:2005-05-05
申请号:US10489293
申请日:2002-10-04
IPC分类号: C07C67/03 , C07C67/08 , C07C69/66 , C07C69/68 , G06F17/20 , G06F17/30 , G06F19/00 , G06Q10/00 , C07C69/76
CPC分类号: C07C67/08 , Y02P20/127 , Y02P20/582 , C07C69/68
摘要: The invention concerns a method for producing esters of a hydroxy acid and a C1-C8 alcohol. The invention is characterized by the fact that the esterification is carried out by reactive distillation on a heterogeneous catalyst. The invention makes it possible in particular to produce high purity lactic acid esters in high yields.
摘要翻译: 本发明涉及一种生产羟基酸和C 1 -C 8醇的酯的方法。 本发明的特征在于通过在多相催化剂上进行反应蒸馏来进行酯化。 本发明可以特别高产率生产高纯度乳酸酯。
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公开(公告)号:US4900717A
公开(公告)日:1990-02-13
申请号:US152430
申请日:1988-02-04
CPC分类号: C07C7/14 , Y10S505/813 , Y10S505/817
摘要: In a process for selective crystallization of 2,6-dialkyl-naphthalene selected from the group consisting of methyl-n-propyl-naphthalene, methyl isopropyl-naphthalene, ethyl-isopropyl-napthalene, ethyl-n-butyl-naphthalene, di-n-propyl-naphthalene, diisopropyl-naphthalene, methyl-amyl-naphthalene, ethyl-amyl-naphthalene, propyl-amyl-naphthalene, di-n-butyl-naphthalene and diisobutyl-naphthalene from their isomer mixtures from a polar solvent solution, the improvement comprising effecting the crystallization with constant stirring at a temperature from 25.degree. to -30.degree. C. to obtain the 2,6-dialkyl-naphthalene at least 95% pure.
摘要翻译: 在选自甲基 - 正丙基 - 萘,甲基异丙基 - 萘,乙基 - 异丙基萘,乙基 - 正丁基 - 萘,二 - 丙基 - 萘,二异丙基萘,甲基 - 戊基 - 萘,乙基 - 戊基 - 萘,丙基 - 戊基 - 萘,二正丁基 - 萘和二异丁基 - 萘从它们的极性溶剂溶液的异构体混合物, 包括在25至-30℃的温度下不断搅拌下进行结晶,得到至少95%纯度的2,6-二烷基萘。
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公开(公告)号:US4795847A
公开(公告)日:1989-01-03
申请号:US151697
申请日:1988-02-02
申请人: Jens Weitkamp , Marita Neuber , Wilhelm Holtmann , Gerd Collin , Hans Spengler
发明人: Jens Weitkamp , Marita Neuber , Wilhelm Holtmann , Gerd Collin , Hans Spengler
IPC分类号: B01J29/06 , B01J29/40 , C07B61/00 , C07C1/00 , C07C2/66 , C07C2/86 , C07C15/24 , C07C67/00 , C07C2/68
CPC分类号: C07C2/66 , B01J29/40 , C07C2/864 , C07C2529/40
摘要: A process for the preparation of 2,6-dialkyl-naphthalenes comprising selectively alkylating naphthalene or 2-alkyl-naphthalene with alkylating agent in the presence of a zeolite catalyst at 250.degree. to 345.degree. C. which dialkyl-naphthalenes are useful for the preparation of naphthalene 2,6-dicarboxylic acid used to produce high-quality polyesters or polyamides.
摘要翻译: 一种制备2,6-二烷基萘的方法,包括在250至345℃的沸石催化剂存在下,用烷基化剂选择性地烷基化萘或2-烷基萘,该二烷基萘可用于制备 用于生产高品质聚酯或聚酰胺的萘2,6-二羧酸。
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