aniline;formaldehyde

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The instant emulsions are preferably used as binders for materials containing lignocellulose, as already mentioned. Emulsions which have proved to be particularly suitable for this purpose are those in which the isocyanate component (see German Offenlegungsschrift No. 2,711,958) is the phosgenation product for the undistilled bottom fractions. These may be obtained, for example, by the removal of 25 to 90% by weight, preferably 30 to 85% by weight of 2,2'-, 2,4'- and/or 4,4'-diaminodiphenylmethane from an aniline/formaldehyde condensate. The undistilled bottom fraction may also be obtained by the removal of 25 to 90% by weight, preferably 30 to 85% by weight of 2,2'-, 2,4'- and/or 4,4'-diisocyanatodiphenylmethane from the crude phosgenation product of an aniline/formaldehyde condensate. In either case, the isocyanate component should contain 35 to 70% by weight, preferably 45 to 60% by weight of diisocyanatodiphenylmethane. The 2,4'-diisocyanatodiphenylmethane content is from 1 to 8% by weight, preferably from 2 to 5% by weight and the content of 2,2'-diisocyanatodiphenylmethane is from 0 to 2% by weight. In either case, the isocyanate component has a viscosity at 25° C. of 50 to 600 mPas, preferably 200 to 500 mPas, and an isocyanate content from 28 to 32% by weight. containing lignocellulose

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The instant emulsions are preferably used as binders for materials containing lignocellulose, as already mentioned. Emulsions which have proved to be particularly suitable for this purpose are those in which the isocyanate component (see German Offenlegungsschrift No. 2,711,958) is the phosgenation product for the undistilled bottom fractions. These may be obtained, for example, by the removal of 25 to 90% by weight, preferably 30 to 85% by weight of 2,2'-, 2,4'- and/or 4,4'-diaminodiphenylmethane from an aniline/formaldehyde condensate. The undistilled bottom fraction may also be obtained by the removal of 25 to 90% by weight, preferably 30 to 85% by weight of 2,2'-, 2,4'- and/or 4,4'-diisocyanatodiphenylmethane from the crude phosgenation product of an aniline/formaldehyde condensate. In either case, the isocyanate component should contain 35 to 70% by weight, preferably 45 to 60% by weight of diisocyanatodiphenylmethane. The 2,4'-diisocyanatodiphenylmethane content is from 1 to 8% by weight, preferably from 2 to 5% by weight and the content of 2,2'-diisocyanatodiphenylmethane is from 0 to 2% by weight. In either case, the isocyanate component has a viscosity at 25° C. of 50 to 600 mPas, preferably 200 to 500 mPas, and an isocyanate content from 28 to 32% by weight. containing lignocellulose

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The instant emulsions are preferably used as binders for materials containing lignocellulose, as already mentioned. Emulsions which have proved to be particularly suitable for this purpose are those in which the isocyanate component (see German Offenlegungsschrift No. 2,711,958) is the phosgenation product for the undistilled bottom fractions. These may be obtained, for example, by the removal of 25 to 90% by weight, preferably 30 to 85% by weight of 2,2'-, 2,4'- and/or 4,4'-diaminodiphenylmethane from an aniline/formaldehyde condensate. The undistilled bottom fraction may also be obtained by the removal of 25 to 90% by weight, preferably 30 to 85% by weight of 2,2'-, 2,4'- and/or 4,4'-diisocyanatodiphenylmethane from the crude phosgenation product of an aniline/formaldehyde condensate. In either case, the isocyanate component should contain 35 to 70% by weight, preferably 45 to 60% by weight of diisocyanatodiphenylmethane. The 2,4'-diisocyanatodiphenylmethane content is from 1 to 8% by weight, preferably from 2 to 5% by weight and the content of 2,2'-diisocyanatodiphenylmethane is from 0 to 2% by weight. In either case, the isocyanate component has a viscosity at 25° C. of 50 to 600 mPas, preferably 200 to 500 mPas, and an isocyanate content from 28 to 32% by weight. containing lignocellulose

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A further improved and thus preferred embodiment of the process according to the invention is achieved in that a partial quantity (D") of the organic phase (D) leaving extraction stage (3) is separated and extracted countercurrently in an upstream, preferably multistage, extraction stage (2) with at least a partial quantity, preferably with the entire stream of (C) and the partial stream (D") is calculated in such a manner that the polyamine contained in (D") is as far as possible transferred into the aqueous phase leaving the extraction unit (2), the said aqueous phase, optionally after the addition of water from stream (Y) and/or auxiliary amine and/or further aqueous phase from stream (C) is introduced into extraction stage (3) and the organic phase (R) arising in (2), which is substantially composed of hydrophobic solvent and optionally auxiliary amine, is also introduced into extraction stage (3) and, as a constituent of the organic phase (B), is used as a solvent for the starting polyamine (A). The auxiliary amine used is preferably aniline and the polyamine mixture of the diphenylmethane series used is preferably a polyamine mixture of the kind obtained during acid-catalyzed aniline/formaldehyde condensation. is introduced into extraction stage (3)

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: When the process according to the invention is carried out without an aminal preliminary stage, introduction of the aqueous formaldehyde into the system is carried out after the solvent containing aniline has been mixed with the aqueous catalyst phase, which also contains aniline, and before the first reaction stage (5). In that case, the quantity of aqueous formaldehyde is generally calculated to provide a molar ratio of aniline/formaldehyde of from 1.5:1 to 25:1, the calculation of the molar aniline/formaldehyde ratio including both the aniline present in the solution of aniline in hydrophobic solvent which is introduced upstream of the first reactor (5) and the at least partially protonated aniline of the aqueous phase which is returned from the extractor (8) and is to be fed in at this point. High aniline/formaldehyde ratios within the broad ranges mentioned above are necessary for producing polyamines with a high diamine content. The aniline participating in the reactions is formally composed as follows: before the first reaction stage (5)

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The instant emulsions are preferably used as binders for materials containing lignocellulose, as already mentioned. Emulsions which have proved to be particularly suitable for this purpose are those in which the isocyanate component (see German Offenlegungsschrift No. 2,711,958) is the phosgenation product of the undistilled bottom fractions. These may be obtained, for example, by the removal of 25 to 90% by weight, preferably 30 to 85% by weight of 2,2'-, 2,4'- and/or 4,4'-diaminodiphenylmethane from an aniline/formaldehyde condensate. The undistilled bottom fraction may also be obtained by the removal of 25 to 90% by weight, preferably 30 to 85% by weight of 2,2'-, 2,4'- and/or 4,4'diisocyanatodiphenylmethane from the crude phosgenation product of an aniline/formaldehyde condensate. In either case, the isocyanate component should contain 35 to 70% by weight, preferably 45 to 60% by weight of diisocyantodiphenylmethane. The 2,4'-diisocyanatodiphenylmethane content is from 1 to 8% by weight, preferably from 2 to 5% by weight and the content of 2,2'-diisocyanatodiphenylmethane is from 0 to 2% by weight. In either case, the isocyanate component has a viscosity at 25° C. of 50 to 600 mPas, preferably 200 to 500 mPas, and an isocyanate content from 28 to 32% by weight. containing lignocellulose