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1.发明授权
公开(公告)号：US3692829A
公开(公告)日：1972-09-19
申请号：US3692829D
申请日：1970-12-15
Applicant: KNAPSACK AG
Inventor： SENNEWALD KURT , ERPENBACH HEINZ , HANDTE HEINZ , LORK WINFRIED
Abstract: Pure acrylic acid is isolated from an aqueous crude acid containing acrylic acid together with minor proportions of acetic acid, formaldehyde and high boilers boiling at a temperature higher than 220* C by liquid-liquid extraction with the use of 3,3,5-trimethylcyclohexanone and/or isophorone as the extractant(s). To this end, the aqueous acrylic acid-containing crude acid is subjected in an extraction zone to counterflow extraction with the use of the extractant(s) and with the resultant formation of an organic extract containing acrylic acid, acetic acid, high boilers and minor proportions of water, which are dissolved in the extractant; the extract is introduced approximately into the midsection of a first distilling column; acetic acid and water are removed overhead under reduced pressure; the base product of the first distilling column, containing extractant(s), acrylic acid and high boilers, is delivered approximately to the midsection of a second distilling column; pure acrylic acid is distilled off overhead under reduced pressure; and the base product of the second distilling column, consisting of high boilers and extractant(s), is recycled to the extraction zone.
Abstract translation: 将纯丙烯酸与含有丙烯酸的含水粗酸以及少量乙酸，甲醛和高沸点沸点的高沸点物质分离，通过液 - 液萃取，使用3,3,5-三甲基环己酮 和/或异佛尔酮作为萃取剂。 为此，将含水丙烯酸的粗酸在萃取区中进行，使用萃取剂进行逆流萃取，形成含有丙烯酸，乙酸，高沸点和次要的有机萃取物 溶解在萃取剂中的水的比例; 将提取物大致引入第一蒸馏塔的中部; 乙酸和水在减压下从顶部除去; 含有萃取剂，丙烯酸和高锅炉的第一蒸馏塔的基础产物大约送到第二蒸馏塔的中部; 在减压下将纯丙烯酸蒸馏出顶部; 并且由高锅炉和萃取剂组成的第二蒸馏塔的基础产物被再循环到萃取区。
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2.发明授权
公开(公告)号：US3657332A
公开(公告)日：1972-04-18
申请号：US3657332D
申请日：1969-10-24
Applicant: KNAPSACK AG
Inventor： SENNEWALD KURT , GEHRMANN KLAUS , HANDTE HEINZ , HAUSER ALFRED , KOHL GEORG
CPC classification number: C07C51/48 , Y10S203/22 , C07C57/04
Abstract: PROCESS FOR ISOLATING PURE ACRYLIC ACID FROM AN AQUEOUS CRUDE ACID CONTAINING ACRYLIC ACID TOGETHER WITH SMALL PROPORTIONS OF ACETIC ACID, FORMALDEHYDE, ACROELIN, MALEIC ACID AND HIGHER CARBOXYLIC ACIDS AND POSSIBLY POLYMERIC ACRYLIC ACID, BY EXTRACTING THE CRUDE ACID USING AN ORGANIC SOLVENT, WATER-WASHING THE RESULTING ORGANIC EXTRACT, AND DISTILLING THE WASHED EXTRACT TO ISOLATE ACRYLIC ACID THEREFROM. THE AQUEOUS, ACRYLIC ACID-CONTAINING CRUDE ACID IS EXTRACTED USING 3,3,5-TRIMETHYLCYCLOHEXANONE AND/OR ISOPHORONE, THE RESULTING ORGANIC EXTRACT IS DEHYDRATED IN A
FIRST DISTILLING ZONE AND BASE PRODUCT COMING FROM THE FIRST DISTILLING ZONE IS DISTILLED IN A SECOND DISTILLING ZONE TO OBATIN PURE ACRYLIC ACID.-
3.发明授权Process for isolating acrylic acid from aqueous crude acid by extraction with an ester,water washing and azeotropic distillation of the washed extract 失效用水，水洗涤和洗涤提取物的AZEOTROPIC蒸馏法从水溶液中分离丙烯酸的方法
公开(公告)号：US3553261A
公开(公告)日：1971-01-05
申请号：US3553261D
申请日：1968-06-14
Applicant: KNAPSACK AG
Inventor： SENNEWALD KURT , GEHRMANN KLAUS , HANDTE HEINZ , ERPENBACH HEINZ , REIS HELMUT
Abstract: ISOLATION OF PURE ACRYLIC ACID FROM AQUEOUS CRUDE ACID CONTAINING ACRYLIC ACID AND IN ADDITION SMALL PROPORTIONS OF ACETIC ACID AND POSSIBLY FORMALDEHYDE, BY ETHYL ACETATE EXTRACTION COMBINED WITH A SIMULTANEOUS WATER-WASH OF THE RESULTING ORGANIC EXTRACT AND DISTILLATIVE SEPARATION OF THE WASHED EXTRACT INTO (A) PURE ACRYLIC ACID AND (B) A READILY BOILING ETHYL ACETATE/WATER-AZEOTROPE COMPRISING EXTRACTING THE AQUEOUS ACRYLIC ACID-CONTAINING CRUDE ACID BY MEANS OF ABOUT 10 TO 15 PARTS BY WEIGHT ETHYL ACETATE, PER PART BY WEIGHT ACRYLIC ACID, AND SIMULTANEOUSLY WASHING THE RESULTING ORGANIC EXTRACT BY MEANS OF ABOUT 15 TO 25 PARTS OF WEIGHT WATER, PER PART BY WEIGHT ACRYLIC ACID.
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