公开(公告)号：DE2649510A1

公开(公告)日：1977-05-26

申请号：DE2649510

申请日：1976-10-29

Applicant: SNIA VISCOSA

Inventor： SICLARI FRANCESCO ,  ROSSE PIETRO TAOLO ,  CANAVESI LUIGI

IPC: C07C51/235 ,  C07C51/25 ,  C07C55/02 ,  C07C51/26 ,  C07C57/02

公开(公告)号：FR2492371A1

公开(公告)日：1982-04-23

申请号：FR8022166

申请日：1980-10-16

Applicant: SNIA VISCOSA

Inventor： GAETANO MARIO DE ,  CANAVESI LUIGI

IPC: C07C101/04 ,  C07C99/12

Abstract: Omega-amino-dodecanoic acid, (I), is recovered from the crude acid by separating by-prods. from the crude acid. The process comprises (a) treating the crude (I) in the presence of water with an acid, (A), quantity sufficient to achieve (A):(I) molar ratio 2:1 to 1:1 (1.5:1). The water quantity is sufficient to dissolve at least a part of the salt of (A) with (I), without dissolving a part of the by-prods. present in the crude (I). (b) The 2 phases obtd. are separated from one another by standard methods. The 1st of these phases contains most of the salt of (I) with (A), whereas the other phase contains most of the by-prods. (c) The salt of (I) present in the 1st phase is decomposed by reacting with an organic or inorganic base (B). The free (I) obtd. is separated by standard methods. The process is used esp. for separating (I) from crystallisation mother liquors, e.g. obtd. in 11-cyano-undecanoic acid hydrogenation. Yields of (I) can exceed 90-95%.

公开(公告)号：DE3039321A1

公开(公告)日：1982-05-19

申请号：DE3039321

申请日：1980-10-17

Applicant: SNIA VISCOSA

Inventor： DE GAETANO MARIO ,  CANAVESI LUIGI

IPC: C11C1/08 ,  C07C101/04 ,  C07C99/12

Abstract: A process for recovering omega-amino-dodecanoic acid by separating the by-products from the crude acid that comprises, in the sequence indicated (a) treating the crude acid in the presence of water with an acid (A) in such an amount as to obtain an acid (A)/amino acid molar ratio comprised of between 2:1 and 1:1, the amount of water being such as to dissolve at least part of the salt obtained and not to dissolve at least part of the by-products, (b) separating the phases into one containing most of the salt and another containing most of the by-products, (c) decomposing the salt by treatment with an organic or inorganic base (B) and isolating the amino acid in the free state.

公开(公告)号：DE2945004A1

公开(公告)日：1980-05-22

申请号：DE2945004

申请日：1979-11-08

Applicant: SNIA VISCOSA

Inventor： SICLARI FRANCESCO ,  CANAVESI LUIGI ,  ROSSI PIER PAOLO

IPC: C07C55/02 ,  B01J31/00 ,  C07B61/00 ,  C07C51/00 ,  C07C51/235 ,  C07C67/00 ,  C07C57/02 ,  C07C51/26

Abstract: A process for preparing alpha , omega -dicarboxylic acids of the formula HOOC-(CH2)n-COOH in which n=6 to 10 is disclosed. The process consists of the catalytic oxidation of a compound of formula X-(CH2)n-CHO wherein X is CHO or COOH and n is 6 to 10 by O2 pure or in mixture with inert gas, possibly under pressure, in at least one polar solvent, at a temperature comprised between 20 DEG and 90 DEG C. and in the presence of a catalyst. The catalyst is chosen from the group consisting of at least one cobalt (II) salt and one ferrous salt. The amount of the catalyst is