专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

FR2851562A1 Preparation of dimethyl ketene, useful in the preparation of polydimethyl ketene, by pyrolysis of isobutyric anhydride 未知
公开(公告)号：FR2851562A1
公开(公告)日：2004-08-27
申请号：FR0302219
申请日：2003-02-21
申请人： ATOFINA
发明人： LINNEMAN REINHARDT , HUB SERGE , LE GUILLAUME , MARTINO GAUCHI GEORGES
IPC分类号： C07C45/89 , C07C49/88 , C08F16/36 , C08F116/36
摘要： Preparation of dimethyl ketene (DMK) involves preheating a mixture of isobutyric anhydride (ANIB) and inert gas; pyrolyzing at 400-550[deg]C for 0.05-10 seconds; and cooling to separate DMK and inert gas from ANIB and isobutyric anhydride (AIB). Preparation of dimethyl ketene (DMK) is effected by pyrolysis of isobutyric anhydride (ANIB) in which: (a) a mixture comprising 1-50% ANIB and 99-50% of inert gas is pre-heated to 300-340[deg]C; (b) the mixture is further heated to 400-550[deg]C for 0.05-10 seconds to obtain a mixture of DMK, inert gas, isobutyric anhydride (AIB) and unreacted ANIB; (c) the current is cooled to separate DMK and inert gas from AIB and ANIB.

2. 发明专利

FR2848208A1 Continuous production of ethyl lactate, useful as solvent for cleaning and degreasing surfaces, involves esterifying lactic acid with ethanol and removing water by molecular sieve adsorption and distillation 未知
公开(公告)号：FR2848208A1
公开(公告)日：2004-06-11
申请号：FR0215347
申请日：2002-12-05
申请人： ATOFINA
发明人： MARTINO GAUCHI GEORGES , TEISSIER REMY
IPC分类号： C07C67/08 , C07C69/68 , C07C67/48
摘要： Continuous production of ethyl lactate by esterifying lactic acid with ethanol comprises continuously removing a near-azeotropic water-ethanol gas mixture, drying the mixture with a molecular sieve to produce a gaseous ethanol stream, water-ethanol stream and a water-ethanol azeotrope which is injected into the top of the distillation column; and continuously withdrawing crude ethyl lactate and purifying it. Continuous production of ethyl lactate by esterifying lactic acid with ethanol in an initial ethanol/lactic acid molar ratio of at least 2.5 in the presence of a catalyst at reflux temperature of 100 degrees C and an absolute pressure of 1.5-3 bar comprises continuously removing a near-azeotropic water-ethanol gas mixture, drying the mixture with a molecular sieve to produce a gaseous ethanol stream (which can be recycled to the esterification reaction mixture) and a water-ethanol stream which is distilled to obtain water and a water-ethanol azeotrope which is injected into the top of the distillation column; and continuously withdrawing crude ethyl lactate and purifying it.

3. 发明专利

FR2848208B1 未知
公开(公告)号：FR2848208B1
公开(公告)日：2005-01-14
申请号：FR0215347
申请日：2002-12-05
申请人： ATOFINA
发明人： MARTINO GAUCHI GEORGES , TEISSIER REMY
IPC分类号： C07C67/08 , C07C69/68 , C07C67/48
摘要： Continuous production of ethyl lactate by esterifying lactic acid with ethanol comprises continuously removing a near-azeotropic water-ethanol gas mixture, drying the mixture with a molecular sieve to produce a gaseous ethanol stream, water-ethanol stream and a water-ethanol azeotrope which is injected into the top of the distillation column; and continuously withdrawing crude ethyl lactate and purifying it. Continuous production of ethyl lactate by esterifying lactic acid with ethanol in an initial ethanol/lactic acid molar ratio of at least 2.5 in the presence of a catalyst at reflux temperature of 100 degrees C and an absolute pressure of 1.5-3 bar comprises continuously removing a near-azeotropic water-ethanol gas mixture, drying the mixture with a molecular sieve to produce a gaseous ethanol stream (which can be recycled to the esterification reaction mixture) and a water-ethanol stream which is distilled to obtain water and a water-ethanol azeotrope which is injected into the top of the distillation column; and continuously withdrawing crude ethyl lactate and purifying it.

4. 发明专利

FR2795409B1 未知
公开(公告)号：FR2795409B1
公开(公告)日：2001-08-24
申请号：FR9907920
申请日：1999-06-22
申请人： ATOFINA
发明人： TEISSIER REMY , MARTINO GAUCHI GEORGES
IPC分类号： B01J23/04 , C07B61/00 , C07C45/67 , C07C45/82 , C07C49/603 , C07C49/303
摘要： Continuous process for the manufacture of beta -isophorone from alpha -isophorone, itself obtained by the trimerization of acetone in an alkaline medium. beta -Isophorone (3,5,5-trimethyl cyclohexa-3-en-1-one (I) is prepared continuously from alpha -isophorone (3,5,5-trimethyl cyclohexa-2-en-1-one (II) in the following stages: (a) (II) and an alkaline hydroxide solution (preferably KOH in methanol or ethanol) are introduced into a reaction zone; (b) they are heated to at least 150 (preferably 185 - 216 degrees C); (c) the reaction mixture is eliminated continuously by two means, firstly by distillation at 150 - 216 degrees C and a pressure of 350 mbar or up to atmospheric to isolate a fraction containing 30-90% (I) (preferably 50 - 70 % (I)), and secondly by drawing off the heavy products from the reaction, such that their content in the reaction mixture is at most 7 %; (d) the distillate from (c) is distilled under reduced pressure at 100 - 150 degrees C to give a product in which the ratio (I)/(II) is at least 99 %; and (e) (e) the distillation residue is returned continuously to the reaction zone.

5. 发明专利

FR2795409A1 未知
公开(公告)号：FR2795409A1
公开(公告)日：2000-12-29
申请号：FR9907920
申请日：1999-06-22
申请人： ATOFINA
发明人： TEISSIER REMY , MARTINO GAUCHI GEORGES
IPC分类号： B01J23/04 , C07B61/00 , C07C45/67 , C07C45/82 , C07C49/603 , C07C49/303
摘要： Continuous process for the manufacture of beta -isophorone from alpha -isophorone, itself obtained by the trimerization of acetone in an alkaline medium. beta -Isophorone (3,5,5-trimethyl cyclohexa-3-en-1-one (I) is prepared continuously from alpha -isophorone (3,5,5-trimethyl cyclohexa-2-en-1-one (II) in the following stages: (a) (II) and an alkaline hydroxide solution (preferably KOH in methanol or ethanol) are introduced into a reaction zone; (b) they are heated to at least 150 (preferably 185 - 216 degrees C); (c) the reaction mixture is eliminated continuously by two means, firstly by distillation at 150 - 216 degrees C and a pressure of 350 mbar or up to atmospheric to isolate a fraction containing 30-90% (I) (preferably 50 - 70 % (I)), and secondly by drawing off the heavy products from the reaction, such that their content in the reaction mixture is at most 7 %; (d) the distillate from (c) is distilled under reduced pressure at 100 - 150 degrees C to give a product in which the ratio (I)/(II) is at least 99 %; and (e) (e) the distillation residue is returned continuously to the reaction zone.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式