公开(公告)号：US3879380A

公开(公告)日：1975-04-22

申请号：US31363872

申请日：1972-12-11

Applicant: STAMICARBON

Inventor： DE ROOIJ ABRAHAM H ,  GOETTSCH REIJER

IPC: B01D11/04 ,  B01D9/02 ,  C07D201/04 ,  C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16 ,  C07D201/04

Abstract: A process for recovering lactams from a mixture of one or more lactams and sulphuric acid is disclosed, wherein the sulphuric acid is neutralized with ammonia or an ammonium salt to ammonium hydrogen sulfate in the presence of a lactam solvent. The neutralization produces a melt of ammonium hydrogen sulfate and a solution of lactam in the organic solvent, and the melt is readily separated from the solution. The lactam can then be recovered from the organic solvent. The process allows the lactam to be recovered in good yield without producing, as by-product, ammonium sulfate.

Abstract translation: 公开了一种从一种或多种内酰胺和硫酸的混合物中回收内酰胺的方法，其中硫酸在内酰胺溶剂存在下用氨或铵盐中和至硫酸氢铵。 中和产生硫酸氢铵的熔体和内酰胺在有机溶剂中的溶液，并且熔体容易从溶液中分离出来。 然后可以从有机溶剂中回收内酰胺。

公开(公告)号：US3859278A

公开(公告)日：1975-01-07

申请号：US38474773

申请日：1973-08-01

Applicant: STAMICARBON

Inventor： DE ROOY ABRAHAM H ,  GOETTSCH REIJER

IPC: C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16

Abstract: Lactams are recovered from a solution of one or more lactams and sulfuric acid in an organic solvent after neutralization with ammonia or an ammonium salt and water without the simultaneous coproduction of solid ammonium sulfate according to the disclosed process. Ammonium hydrogen sulfate produced in the neutralization step is removed in the solution form, preferably concentrated to about 80 per cent by weight and the lactam is recovered from the organic solvent. Removing the ammonium hydrogen sulfate in the solution form rather than a solid avoids crystallization and deposition of the salt onto the surfaces of processing equipment.

公开(公告)号：DE2801256A1

公开(公告)日：1978-07-13

申请号：DE2801256

申请日：1978-01-12

Applicant: STAMICARBON

Inventor： GEURTS GERARDUS ALPHONSUS ,  GOETTSCH REIJER

IPC: C07D201/16

Abstract: A method of recovering epsilon -caprolactam from the residue remaining from the distillation of impure epsilon -caprolactam wherein the residue is treated with sulphuric acid or oleum at a temperature between about 80 DEG C. and about 140 DEG C. and the resultant mixture neutralized. The lactam is then extracted with an organic solvent with the lactam then recovered from the resultant solution.

公开(公告)号：CH629784A5

公开(公告)日：1982-05-14

申请号：CH792477

申请日：1977-06-28

Applicant: STAMICARBON

Inventor： GOETTSCH REIJER ,  ZWART RUDOLF LAMBERTUS

IPC: C01C1/24 ,  C07D201/16 ,  C07D223/10

公开(公告)号：CS183740B2

公开(公告)日：1978-07-31

申请号：CS417074

申请日：1974-06-12

Applicant: STAMICARBON

Inventor： GOETTSCH REIJER ,  DE ROOIJ ABRAHAM H

IPC: B01D9/02 ,  C07D201/16

Abstract: Polymerizable quality epsilon -caprolactam having an alkalinity of less than 0.05 meq. per kg. of lactam is produced in the improved disclosed process which includes extracting an aqueous lactam-rich solution with an organic solvent having a high distribution coefficient for the lactam with respect to the aqueous solution, and evaporating the lactam-rich organic solvent solution and recovering by distillation the lactam. Evaporation of the organic solvent requires considerably less thermal energy than evaporation of a similar aqueous solution.

公开(公告)号：DE2704561A1

公开(公告)日：1977-08-04

申请号：DE2704561

申请日：1977-02-03

Applicant: STAMICARBON

Inventor： WASSEN WILLEM JOSEPH ,  GOETTSCH REIJER

IPC: C01C1/24 ,  C07D201/16 ,  C07D223/10

Abstract: A process for removing sulfuric acid from reaction mixtures containing sulfuric acid and epsilon -caprolactam by treating the sulfuric acid with ammonia and sulfur dioxide to produce ammonium sulfate salts and reducing the ammonium sulfate salts to ammonia and sulfur dioxide.

公开(公告)号：DE1571710A1

公开(公告)日：1971-02-04

申请号：DE1571710

申请日：1966-06-15

Applicant: STAMICARBON

Inventor： KARDAUN GEORG ,  GOETTSCH REIJER ,  MATHIAS KIERKELS PETER

IPC: C10L5/08

公开(公告)号：DE3166798D1

公开(公告)日：1984-11-29

申请号：DE3166798

申请日：1981-05-29

Applicant: STAMICARBON

Inventor： GOETTSCH REIJER ,  JETTEN ARNOLD GODFRIED MARIA

IPC: C07D207/26 ,  C07D201/16

Abstract: In a distillation process 2-pyrrolidones obtained from succinonitrile are purified by treating the impure liquid pyrrolidone with a strong base, fractionally distilling this product to yield, as distillate, polymerization grade purified 2-pyrrolidone, mixing the 2-pyrrolidone-containing residue from the fractional distillation with water and an acid, and extracting purified 2-pyrrolidone from the water/acid mixture. The latter purified 2-pyrrolidone products are suitable for recycling to the pyrrolidone synthesis or to make other products.

公开(公告)号：CH626063A5

公开(公告)日：1981-10-30

申请号：CH119977

申请日：1977-02-01

Applicant: STAMICARBON

Inventor： WASSEN WILLEM JOSEPH ,  GOETTSCH REIJER

IPC: C01C1/24 ,  C07D201/16 ,  C07D223/08

Abstract: A process for removing sulfuric acid from reaction mixtures containing sulfuric acid and epsilon -caprolactam by treating the sulfuric acid with ammonia and sulfur dioxide to produce ammonium sulfate salts and reducing the ammonium sulfate salts to ammonia and sulfur dioxide.

公开(公告)号：RO64765A

公开(公告)日：1980-01-15

申请号：RO7267372

申请日：1972-10-30

Applicant: STAMICARBON

Inventor： GOETTSCH REIJER ,  VOS HERMAN M A

IPC: C07D201/04 ,  C07D201/16 ,  C07D223/10

Abstract: 1399000 #-Caprolactam STAMICARBON NV 27 Oct 1972 [29 Oct 1971 25 Aug 1972] 49733/72 Heading C2C #-Caprolactam obtained by the Beckmann rearrangement of cyclohexanone oxime with a sulphuric acid, oleum or SO 3 catalyst followed by dilution of the Beckmann rearrangement product with water and/or partial neutralization of the product by the addition of ammonia and/or a sulphuric acid salt of ammonia, extraction with a substantially water-immiscible organic solvent for the product lactam and removal of the solvent is recovered by neutralizing the lactam-containing solution with aqueous ammonia to a pH of at least 4À5 when measured at 20‹ C. to form an emulsion of an aqueous ammonium sulphate solution in the organic solvent, washing the said emulsion, optionally after settling of the emulsion and separating off the thereby-formed supernatant phase, with demineralized water in a weight ratio of 4 to 20 parts emulsion per 1 part of water, and extracting the thus-treated laetam-containing solvent with water, optionally treating the resulting aqueous lactam solution with cation and anion exchangers, and evaporating water from the said aqueous lactam solution. The #-caprolactam obtained contains less than 5 m.eq. of ionic substances per kg. of lactam.