Abstract:
PROBLEM TO BE SOLVED: To provide an improved method for producing a pyrrole and a pyridine. SOLUTION: This method for producing the pyrrole of formula (I) by dehydrogenating a pyrrolidine of formula (II), or producing the pyridine of formula (III) by dehydrogenating a piperidine of formula (VI), in the presence of a noble metal catalyst is substantially carried out in the presence of 1-50 wt.% water based on the total of the pyrrolidine and the water or the piperidine and the water respectively.
Abstract:
PROBLEM TO BE SOLVED: To economically, selectively and efficiently reduce the concentration of amines existing in an N-substituted lactam as an impurity by treating a polluted N-substituted lactam with an acidic macroporous cation exchanger. SOLUTION: (A) An N-substituted lactam polluted with amines is treated with (B) an acidic macroporous cation exchanger. A strong acidic macroporous cation exchanger is used in the treatment and the component B has a styrene- divinylbenzene copolymer base material having 10-150 nm pore diameter. The usable capability of the component B is at least 0.5 mol of amines per 1 L of the cation exchanger and the component A is useful for purification of a compound expressed by the formula [R is a (substituted) saturated aliphatic group or the like; (n) is 1-4], especially for N-methyl-2-pyrrolidone, and the treatment is preferably performed at 5-130 deg.C.
Abstract:
The invention relates to a method for obtaining 3-aminomethyl-3,5,5-trimethyl cyclohexylamine (isophorone diamine, IPDA) with a cis/trans isomer ratio of at least 73/27 by fractional distillation. Said method comprises the following steps: a) preparation of IPDA with a cis/trans isomer ratio /=73/27 and iv) an IPDA fraction with a cis/trans isomer ratio
Abstract:
Pure isophorone-diamine (IPDA) with a cis/trans isomer ratio (CTR) of at least 73/27 is obtained by (a) making crude IPDA with a CTR below 73/27, (b) purifying and separating into fractions with CTR of at least 73/27 (b1) and below 63/37 (b2), (c) isomerizing (b2) in presence of hydrogen, ammonia and catalyst to give IPDA with a CTR of 63/37-66/34 which is recycled to stage (a). A method (M1) for the production of substantially pure 3-aminomethyl-3,5,5-trimethyl cyclohexylamine (isophorone-diamine; IPDA) with a cis/trans isomer ratio (CTR) of at least 73/27 involves: (a) preparation of crude IPDA with a CTR of less than 73/27, (b) purification and separation to give fractions (b1) with a CTR of at least 73/27 and (b2) with a CTR of less than 63/27 and (c) isomerization of (b2) in presence of hydrogen, ammonia and a hydrogenation catalyst to give IPDA with a CTR of 63/37-66/34 which is then recycled to stage (a). An Independent claim is also included for a method (M2) for the production of IPDA with a CTR in the range 63/37 to 66/34 by reacting IPDA with any CTR value with hydrogen and ammonia in presence of a hydrogenation catalyst.
Abstract:
Pure isophorone-diamine (IPDA) with a cis/trans isomer ratio (CTR) of at least 73/27 is obtained by (a) making crude IPDA with a CTR below 73/27, (b) purifying and separating into fractions with CTR of at least 73/27 (b1) and below 63/37 (b2), (c) isomerizing (b2) in presence of hydrogen, ammonia and catalyst to give IPDA with a CTR of 63/37-66/34 which is recycled to stage (a). A method (M1) for the production of substantially pure 3-aminomethyl-3,5,5-trimethyl cyclohexylamine (isophorone-diamine; IPDA) with a cis/trans isomer ratio (CTR) of at least 73/27 involves: (a) preparation of crude IPDA with a CTR of less than 73/27, (b) purification and separation to give fractions (b1) with a CTR of at least 73/27 and (b2) with a CTR of less than 63/27 and (c) isomerization of (b2) in presence of hydrogen, ammonia and a hydrogenation catalyst to give IPDA with a CTR of 63/37-66/34 which is then recycled to stage (a). An Independent claim is also included for a method (M2) for the production of IPDA with a CTR in the range 63/37 to 66/34 by reacting IPDA with any CTR value with hydrogen and ammonia in presence of a hydrogenation catalyst.
Abstract:
A process for continuously preparing 2-pyrrolidone by reacting gamma-butyrolactone with ammonia in the liquid phase in the presence of water, wherein the reaction is carried out at a temperature of from 275 to 300° C. and an absolute pressure of from 140 to 180 bar.
Abstract:
Pure isophorone-diamine (IPDA) with a cis/trans isomer ratio (CTR) of at least 73/27 is obtained by (a) making crude IPDA with a CTR below 73/27, (b) purifying and separating into fractions with CTR of at least 73/27 (b1) and below 63/37 (b2), (c) isomerizing (b2) in presence of hydrogen, ammonia and catalyst to give IPDA with a CTR of 63/37-66/34 which is recycled to stage (a). A method (M1) for the production of substantially pure 3-aminomethyl-3,5,5-trimethyl cyclohexylamine (isophorone-diamine; IPDA) with a cis/trans isomer ratio (CTR) of at least 73/27 involves: (a) preparation of crude IPDA with a CTR of less than 73/27, (b) purification and separation to give fractions (b1) with a CTR of at least 73/27 and (b2) with a CTR of less than 63/27 and (c) isomerization of (b2) in presence of hydrogen, ammonia and a hydrogenation catalyst to give IPDA with a CTR of 63/37-66/34 which is then recycled to stage (a). An Independent claim is also included for a method (M2) for the production of IPDA with a CTR in the range 63/37 to 66/34 by reacting IPDA with any CTR value with hydrogen and ammonia in presence of a hydrogenation catalyst.
Abstract:
Recovery of isophoronediamine (IPDA) comprises preparation of IPDA having a cis/trans isomer ratio of less than 73/27 and separation into at least 5 fractions by distillation including an IPDA fraction having a cis/trans ratio of greater than 73/27 and a fraction having a cis/trans ratio of less than 66/34. A process for the recovery of 3-aminomethyl-3,5,5-trimethylcyclohexylamine (isophoronediamine, IPDA) comprises; (a) preparation of IPDA having a cis/trans isomer ratio of less than 73/27; (b) introduction of IPDA to the middle region of a distillation column having inserts and distillation of IPDA at 5-300 degreesC and 10-2000 mbar; (c) optionally further purification of the IPDA from (b) by distillation in at least one further column whereby the IPDA from step (b) and (c) are separated into at least 5 fractions comprising an organic fraction (1a) containing impurities having a lower b. pt. than trans-IPDA, an aqueous fraction (1b) containing impurities having a lower b. pt. than trans-IPDA, a fraction (2) containing impurities having a higher b. pt. than cis-IPDA, an IPDA fraction (3) having a cis/trans ratio of greater than 73/27 and an IPDA fraction (4) having a cis/trans ratio of less than 66/34.
Abstract:
- 16 - O.Z. 0050/36942 of the Diclosure: Oximinophosphoric acid derivatives of the formula I (I), where R1 is straight-chain or branched-alkyl of not more than 4 carbon atoms, R2 is straight-chain or branched alkoxy or alkylthio, each of not more than 4 carbon atoms, straight-chain or branched alkyl of not more than 3 carbon atoms, phenyl, amino, or straight-chain or branched alkylamino or dialkylamino, where alkyl in each case is of not more than 4 carbon atoms, R3 is straight-chain or branched alkyl of not more than 4 carbon atoms and X is oxygen or sulfur, their preparation, and their use as crop protection agents.
Abstract:
Procedimiento para la obtención de la 3-aminometil-3, 5, 5-trimetilciclohexilamina (isoforonadiamina, IPDA) con una proporción entre los isómeros cis/trans de, al menos, 73/27 mediante destilación fraccionada, que contiene las etapas siguientes: a) preparación de la IPDA con una proporción entre los isómeros cis/trans _ 73/27 y iv) una fracción de IPDA con una proporción entre los isómeros cis/trans >_ 66/34.