Abstract:
PROBLEM TO BE SOLVED: To provide a catalyst for addition of HCN to isophorone with high yields and high selectivities at an inexpensive cost. SOLUTION: The catalyst used is CaO which has a BET surface area less than 1.5 m 2 /g. The use of such a catalyst achieves high yields and selectivities. COPYRIGHT: (C)2004,JPO
Abstract:
The invention relates to a method for producing compounds of general formula (IIb), wherein R represents C6-C30 alkyl or C6-C30 alkenyl which can also support up to 5 hydroxyl groups, formyl groups, C1-C4 alkoxy groups, phenoxy groups or C1-C4 alkoxycarbonyl groups as substituents and which can be interrupted by up to 5 non-adjacent oxygen atoms, or alkoxylate groupings of formula -(CH2)k-O-(A O)m-(A O)n - Y, wherein A and A represent 1,2 alkylene groups with 2 to 4 C-atoms, Y represents hydrogen, C1-C12 alkyl, phenyl, or C1-C4 alkoxycarbonyl, k represents the number 1, 2 or 3 and m and n each represent numbers from 0 to 50, the sum of m and n being at least 4, independently of each other. According to the inventive method, iminodiacetonitrile is reacted with aldehydes of general formula R-CHO and HCN or alkali cyanides. The method is carried out a) without using an organic solvent and in the presence of a Lewis or Bronsted acid, or b) with or without an organic solvent and in the presence of an emulsifier, or c) with or without an organic solvent and at a pressure of 1 to 40 bar.
Abstract:
The invention relates to a process for preparing low-by-product, light-color methylglycine-N,N-diacetic acid tri(alkali metal) salt by alkaline hydrolysis of methylglycinediacetonitrile (MGDN), comprising the steps in the sequence (a) to (f): (a) mixing of MGDN with aqueous alkali at a temperature of ≦̸30° C.; (b) allowing the aqueous alkaline MGDN suspension to react at a temperature in the range from 10 to 30° C. over a period of from 0.1 to 10 h to form a solution; (c) allowing the solution from step (b) to react at a temperature in the range from 30 to 40° C. over a period of from 0.1 to 10 h; (d) optionally allowing the solution from step (c) to react at a temperature in the range from 50 to 80° C. over a period of from 0.5 to 2 h; (e) optionally allowing the solution from step (c) or (d) to react at a temperature in the range from 110 to 200° C. over a period of from 5 to 60 min; (f) hydrolysis and removal of ammonia of the solution obtained in step (c), (d) or (e) by stripping at a temperature of from 90 to 105° C.
Abstract:
A process for preparing compounds of the formula IIb where R is C6-C30-alkyl or C6-C30-alkenyl, which may additionally have upto 5 hydroxyl groups, formyl groups, C1-C4-alkoxy groups, phenoxy groups or C1-C4-alkoxycarbonyl groups as substituents and may be interrupted by upto 5 nonadjacent oxygen atoms, or alkoxylate groups of the formula -(CH2)k-O-(A1O)m-(A2O)n-Y where A1 and A2 are, independently of one another, 1,2-alkylene groups having 2 to 4 carbon atoms, Y is hydrogen, C1-C12-alkyl, phenyl or C1-C4-alkoxycarbonyl, and k is 1, 2 or 3, and m and n are each numbers from 0 to 50, and the total of m+n must be at least 4,by reacting iminodiacetonitrile with aldehydes of the formula R-CHO and HCN or alkali metal cyanides, the process being carried outa) in the absence of an organic solvent and in the presence of a Lewis or Brönsted acid, orb) in the presence or absence of an organic solvent and in the presence of an emulsifier, orc) in the presence or absence of an organic solvent and under a pressure in the range from 1 to 40 bar.
Abstract:
The present invention relates to a process for preparing 3-cyano-3,5,5-trimethylcyclohexanone (isophoronenitrile) by reacting isophorone with hydrogen cyanide in the presence of a base as a catalyst to obtain a crude isophoronenitrile product, and subsequently distilling the crude isophoronenitrile product, with the addition before distillation of at least one specific sulfonic acid or specific carboxylic acid. In addition, the present invention relates to the use of a specific sulfonic acid or of a specific carboxylic acid as a neutralizing agent before distillation of a crude isophoronenitrile product which has been obtained by reacting isophorone with hydrogen cyanide in the presence of a base as a catalyst, in order to avoid precipitates in the neutralization of the base used as a catalyst with an acid.
Abstract:
The present invention relates to a process for preparing 3-cyano-3,5,5-trimethylcyclohexanone (isophoronenitrile) by reacting isophorone with hydrogen cyanide in the presence of a base as a catalyst to obtain a crude isophoronenitrile product, and subsequently distilling the crude isophoronenitrile product, with the addition before distillation of at least one specific sulfonic acid or specific carboxylic acid. In addition, the present invention relates to the use of a specific sulfonic acid or of a specific carboxylic acid as a neutralizing agent before distillation of a crude isophoronenitrile product which has been obtained by reacting isophorone with hydrogen cyanide in the presence of a base as a catalyst, in order to avoid precipitates in the neutralization of the base used as a catalyst with an acid.
Abstract:
The invention relates to a process for preparing low-by-product, light-color methylglycine-N,N-diacetic acid tri(alkali metal) salt by alkaline hydrolysis of methylglycinediacetonitrile (MGDN), comprising the steps in the sequence (a) to (f): (a) mixing of MGDN with aqueous alkali at a temperature of ≦̸30° C.; (b) allowing the aqueous alkaline MGDN suspension to react at a temperature in the range from 10 to 30° C. over a period of from 0.1 to 10 h to form a solution; (c) allowing the solution from step (b) to react at a temperature in the range from 30 to 40° C. over a period of from 0.1 to 10 h; (d) optionally allowing the solution from step (c) to react at a temperature in the range from 50 to 80° C. over a period of from 0.5 to 2 h; (e) optionally allowing the solution from step (c) or (d) to react at a temperature in the range from 110 to 200° C. over a period of from 5 to 60 min; (f) hydrolysis and removal of ammonia of the solution obtained in step (c), (d) or (e) by stripping at a temperature of from 90 to 105° C.
Abstract:
La invencion se refiere a un metodo para producir 3-ciano-3,5,5-trimetilciclohexanona (nitrilo de isoforona) al hacer reaccionar isoforona con cianuro de hidrogeno en presencia de una base como un catalizador. Un acido sulfonico especial o un acido carboxilico especial se agrega al producto de nitrilo de isoforona crudo resultante el cual es destilado posteriormente. La invencion se refiere ademas al uso de un acido sulfonico especial o un acido carboxilico especial como un agente de neutralizacion antes de la destilacion de un producto de nitrilo de isoforona crudo que se obtiene al hacer reaccionar isoforona con cianuro de hidrogeno en presencia de una base como un catalizador a fin de evitar precipitaciones durante la neutralizacion de la base utilizada como un catalizador con acido.