Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
  • C07F7/1804—Compounds having Si-O-C linkages
  • C07F7/1872—Preparation; Treatments not provided for in C07F7/20
  • C07F7/1892—Preparation; Treatments not provided for in C07F7/20 by reactions not provided for in C07F7/1876 - C07F7/1888
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/20—Purification, separation
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages

Definitions

• the present invention relates to a novel process for working up saline residues, as obtained in the preparation of an amino-functional organosilane by reacting a halogen-functional organosilane with excess ammonia or an organic amine. Furthermore, the invention relates to special bis- and tris-amino-functional organosilane-containing compositions and their use. Aminofunctional organosilanes are also referred to below as aminosilanes.
• a residue containing ammonium halide and / or organic amine hydrohalides as obtained in the preparation of amino-functional organosilanes by reacting a halogen-functional organosilane with ammonia or an organic amine, is referred to here and below as the salt-containing residue or even shorter as the residue.
• Aminosilanes have a diverse range of applications. They are used for example for glass fiber sizes or used in the foundry industry as processing aids, they also serve as adhesion promoters for storage-stable resins.
• Said residues may contain, for example, ammonium chloride, 3-aminopropylthethoxysilane hydrochloride (so-called AMEO hydrochloride) and bis-AMEO hydrochloride or tris-AMEO hydrochloride, optionally corresponding hydrolysis-induced disiloxanes, etc.
• AMEO hydrochloride 3-aminopropylthethoxysilane hydrochloride
• bis-AMEO hydrochloride or tris-AMEO hydrochloride optionally corresponding hydrolysis-induced disiloxanes, etc.
• the present invention therefore an object of the invention to find another way of value-adding workup in the production of amino-functional organosilanes.
• a particular concern was to supply saline residues from the production of amino-functional organosilanes for economic use.
• Preparation on the implementation of a halogen-functional, preferably chlorofunctional Organoalkoxysilans with excess ammonia or an organic amine, preferably under pressure and in the liquid phase, and subsequent separation and workup of crude product and resulting salt based, can work up in a simple and economical manner by the said residue is optionally first a substantially non-polar organic Adding solvent, further a strong aqueous alkali added, allowed to react - preferably the time period of the reaction is controlled - then separated after the formation of the two phases, the aqueous phase of the organic phase, removed from the organic phase, the organic solvent and the remaining in the sump organic phase wins.
• a clear, usually yellow to deep orange colored, high-quality bis- and tris-amino-functional organosilane containing composition which is used for many applications in place of unbridged amino-functional organosilanes can use advantageous with high added value.
• a composition obtained by the process according to the invention advantageously has a content of hydrolyzable chloride of less than 100 ppm by weight up to the detection limit of 6 ppm by weight.
• hydrolyzable chloride include organic Aminhydrochlohde, ammonium chlorides, chlorosilanes, etc.
• the determination of hydrolyzable chloride can be done, for example potentiographically with silver nitrate.
• bis- or tris-amino-functional organosilanes (hereinafter also referred to as bis- and tris-silylated amines), which are obtained as by-products in the above-mentioned production of amino-functional organosilanes, usually understood bridged aminosilanes.
• amino-functional organosilanes the following general formulas are given by way of example.
• Unbridged amino-functional organosilanes, d. H. monosilylated amines can be represented by the general formula (Ia):
• R2N [(CH 2) 2 NH] z (Z) Si (R ") n (OR ') 3-n (I), wherein groups R are the same or different and R is hydrogen (H) or a linear or branched alkyl group having 1 to 4 C atoms, preferably H or n-butyl, groups R 'are identical or different and R' is hydrogen (H) or a linear or branched alkyl group having 1 to 8 C atoms or an aryl group, preferably methyl or ethyl, groups R "are identical or different and R" is a linear or branched alkyl group having 1 to 8 represents C atoms, such as methyl, ethyl, propyl, butyl, preferably methyl, or an aryl group, Z represents a bivalent alkyl group from the series -CH 2 -, - (CH 2 ) 2 -, - (CH 2 ) S-, - (CH 2 ) 4 - or - (CH
• Bis-amino functional organosilanes d. H. bis-silylated amines can be illustrated by the general formula Ib:
• R is a hydrogen (H) or a linear or branched alkyl group having 1 to 4 C atoms, preferably H or n-butyl, groups R 'are identical or different and R' is hydrogen (H) or a linear or branched
• n is independent is 0, 1, 2 or 3, preferably 0, and y and z are independently 0, 1 or 2,
• Tris-amino-functional organosilanes ie tris-silylated amines, are usually reflected by the general formula (Ic):
• groups R ' are identical or different and R' is a hydrogen (H) or a linear or branched alkyl group having 1 to 8 C atoms or an aryl group, preferably methyl or ethyl, groups R "are identical or different and R "is a linear or branched alkyl group having 1 to 4 C
• Atoms such as methyl, ethyl, propyl, butyl, preferably methyl, or an aryl group
• groups Z are identical or different and Z is a bivalent alkyl group from the series -CH 2 -, - (CH 2 J 2 -, - (CH 2 ) 3 -, - (CH 2 ) 4 - or - (CH 2 ) (CH) CH 3 (CH 2 ) -, preferably propyl
• n is independently 0, 1, 2 or 3, preferably 0, and x is independently 0, 1 or 2
• the present invention thus provides a process for working up a residue containing ammonium halides and / or organic amine hydrohalides from the preparation of an amino-functional organosilane of the general formula (Ia)
• R is the same or different and R is hydrogen (H) or a linear or branched alkyl group having 1 to 4 C atoms
• groups R ' are identical or different and R' is hydrogen (H) or a linear or branched alkyl group having 1 to 8 carbon atoms or an aryl group
• groups R "are the same or different and R" is one is a linear or branched alkyl group having 1 to 8 C atoms or an aryl group
• Z is a bivalent alkyl group from the series -CH 2 -, - (CH 2 J 2 -, - (CH 2 ) S-, - (CH 2 J 4 - or - (CH 2 ) (CH) CH 3 (CH 2 ) -, n is 0, 1, 2 or 3 and z is 0, 1 or 2,
• X is Cl, Br or J, preferably Cl
• Z is a bivalent alkyl group from the series -CH 2 -, - (CH 2 J 2 -, - (CH 2 J 3 -, - (CH 2 J 4 - or - (CH 2 ) (CH) CH 3 (CH 2 ) -, preferably propyl
• groups R ' are identical or different and R' is a hydrogen (H) or a linear or branched alkyl group having 1 to 8 C-atoms or an aryl group, preferably methyl or ethyl
• groups R "are identical or different and R" is a linear or branched alkyl group having 1 to 8 C atoms, such as methyl, ethyl, propyl, butyl, preferably methyl, or an aryl group
• n is 0, 1, 2 or 3, preferably 0,
• R groups are identical or different and R is hydrogen (H) or a linear or branched alkyl group having 1 to 4 C atoms, preferably H or n-butyl, and z is 0, 1 or 2,
• halogen-functional organoalkoxysilane of the general formula (II) is preferably, but not exclusively, 3-chloropropyltrimethoxysilane, 3-chloro-propyltriethoxysilane, 3-Chlorpropylmethyldimethoxysilan or 3-chloropropyl-methyl-diethoxysilane.
• chloroalkylalkoxysilanes for example 3-chloropropyldiethylmethoxysilane or 3-chloropropylmethylpropylethoxysilane.
• an organic amine of the general formula (III) may be used, for example but not exclusively, methylamine, dimethylamine, ethylamine, diethylamine or propylamine, instead of the abovementioned ammonia.
• the residue from the salt separation of the aminosilane preparation process can be solid or liquid and preferably precipitates in a crystallization unit and / or in a distillative work-up of the crude product.
• the residue to be worked up according to the invention may optionally be initially mixed with an essentially nonpolar organic solvent, preferably selected from the series hexane, heptane, octane, cyclohexane, especially toluene and other nonpolar solvents and then with thorough mixing with an aqueous liquor, preferably a strong liquor a pH of at least 12, more preferably 13 to 14, are added.
• an aqueous liquor preferably a strong liquor a pH of at least 12, more preferably 13 to 14, are added.
• the pH can be determined in a manner known to those skilled in the art, for. B. by means of pH paper.
• the alkali used is preferably a NaOH or KOH liquor.
• the concentration of the aqueous liquor can be selected so that the aqueous phase reaches a pH of 12 after work-up. pH values above 12 are preferable.
• the volume of the aqueous phase can be determined by the amount of NaCl formed during the work-up, and usually depends on the free chloride content of the raw material.
• the resulting mixture is allowed to react with stirring for up to 30 minutes, preferably 15 seconds to 10 minutes, more preferably 20 seconds to 5 minutes, most preferably 25 seconds to 3 minutes, especially 30 seconds to 1 minute.
• Boiler and stirrer are preferably made of a non-rusting material, such as stainless steel or enamelled steel.
• the aqueous phase can be drained from the organic phase via the bottom valve of the boiler and thus separated from the organic phase.
• the aqueous phase usually contains the salt formed in the reaction in dissolved form, with the use of sodium hydroxide solution, the aqueous phase thus contains, for example, dissolved NaCl.
• the separated aqueous phase should additionally have a pH of at least 12.
• the organic phase can now be transferred into a further separation unit, for example into a distillation, or passed over a thin-film evaporator or via a short-path evaporator.
• the organic solvent preferably toluene, is preferably removed, suitably by separation under reduced pressure.
• the organic phase which is suitably filtered and / or distilled to obtain a bis- and tris-amino-functional organosilane composition remains in the bottom.
• a clear, generally colorless, yellow to deep orange colored, high-quality bis- and tris-amino-functional organosilanes containing composition which can be used advantageously for many applications instead of unbridged amino-functional organosilanes.
• the organic phase obtainable by the process according to the invention can also be subjected to fine distillation so as to obtain the respective individual constituents of the organic phase obtained according to the invention.
• X is Cl, Br or J
• Z is a bivalent alkyl group selected from the group -CH 2 -, - (CH 2 J 2 -, - (CH 2 ) S -, - (CH 2 J 4 - or - (CH 2 ) (CH) CH 3 (CH 2 ) -
• groups R ' are the same or different and R' is a hydrogen (H) or a linear or branched alkyl group having 1 to 8 C atoms or an aryl group
• R "groups are the same or different and R" is a linear or branched alkyl group having 1 to 8 C atoms or an aryl group and n is 0, 1, 2 or 3,
• R groups are identical or different and R is hydrogen (H) or a linear or branched alkyl group having 1 to 4 C atoms, preferably H or n-butyl, and z is 0, 1 or 2,
• the process according to the invention is preferably carried out in the preparation of 1-aminomethyltrimethoxysilane, 1-aminomethyltriethoxysilane, 1-aminomethylmethyldimethoxysilane, 1-aminomethylmethyldiethoxysilane, 2-aminoethyltrimethoxysilane, 2-aminoethylthethoxysilane, 3-aminopropylthmethoxysilane (AMMO), 3 Aminopropyltriethoxysilane (AMEO), 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, N-methyl-3-aminopropylthmethoxysilane, N-methyl-3-aminopropylthethoxysilane, N-butyl-3-aminopropylthmethoxysilane, 3-aminopropyldimethylmethoxysilane, 3-aminopropyldimethylethoxy
• the liquid phase thus obtained can now be transferred, for example, into a crystallizer, wherein in the crystallizer an organic or organosilicon liquid or a mixture of said liquids, preferably toluene or hexane, heptane, octane, cyclohexane or a mixture thereof, presents and the crystallizer on a lower pressure level than the previous reaction stage operates.
• an organic or organosilicon liquid or a mixture of said liquids preferably toluene or hexane, heptane, octane, cyclohexane or a mixture thereof.
• the residual quantities of ammonia or organic amine are distilled off, if appropriate additionally by temperature-controlled energy supply.
• the crystallizer can also be cooled.
• the here in the crystallizer resulting ammonium halide or organic amine hydrohalide containing salt can Now you can separate from the crude product, for example by filtration, and win the pure amino-functional organosilane from the crude product in a conventional manner.
• an optionally fractional distillation is carried out, which can be operated under atmospheric pressure or under reduced pressure.
• the said residue, a substantially non-polar organic solvent and a strong aqueous liquor add, optionally temper, mix and preferably allowed to react controlled.
• the aqueous phase which has taken up the salt in an advantageous manner virtually quantitatively, separated from the organic phase and removed from the organic phase, the solvent, preferably under reduced pressure.
• it is also possible to filter the organic phase remaining in the bottom for example by means of a filter or centrifuge.
• a residue containing ammonium halides or amine hydrohalide residue can be advantageously recycled and, in particular, combined with the residue from the crystallizer and / or the distillation and worked up according to the invention.
• the object of the present invention is therefore also a bis- and tris-amino-functional organosilane-containing composition obtainable by the process according to the invention.
• a composition is obtained having a content of 70 to 98 mol%, preferably 80 to 95 mol%, particularly preferably 88 to 91 mol% of bis-amino-functional organosilanes, 0 to 20 mol%, preferably 0.5 to 15 mol%, particularly preferably 4 to 8 mol%, very particularly preferably 4 to 6 mol% of tris-amino-functional organosilanes, 1 to 20 mol%, preferably 3 to 15 mol%, particularly preferably 4 to 6 mol% so-called disiloxanes and ⁇ 20 ppm by weight of hydrolyzable halide, preferably ⁇ 6 ppm by weight, up to the detection limit, in each case based on the entire composition.
• the composition of the invention may contain small amounts of monosilylated amine, usually 0 to 10 mol%, for example 0.1, 0.5, 1, 1, 5, 2 to 5 mol%, based on the composition.
• Such a high added-value composition obtained in a simple and economical manner from a residue can now be used advantageously as a primer, as an ingredient in coating systems, as a constituent in paints and varnishes
• Drilling aids as a means or additive in the extraction and production of
• Acetic acid z. A.,> 99.8% (glacial acetic acid), shelf life 5 years
• Silver nitrate 0.1 mol / l
• calibration solution eg. Shelf life: 2 years, after opening 2 months
• Silver nitrate 0.01 mol / l or 0.005 mol / l, calibration solution, prepared by diluting the solution from 6.4, shelf life 2 months
• sample is placed in a 150 ml beaker and mixed with 20 ml of ethanol and 80 ml of acetic acid. Subsequently, will titrated potentiographically with silver nitrate solution. A blank value is determined with the same reagent quantities.
• the Titroprocessor is usually programmed so that the mass fraction of chloride in mg / kg is printed directly after the titration.
• V ⁇ consumption of AgNO 3 solution in ml
• V BI determined reactive consumption of AgNO 3 solution in ml
• CAgNO3 concentration of AgNO3 solution in mol / l
• Phase was drained. In the aqueous phase, there were still small amounts of solid NaCl and the pH of the aqueous phase was 14. The organic phase was freed from toluene in vacuo at 80 0 C. The product was filtered.
• Example 6 (EJ / V80 / 06) 286.0 g of a yellow residue consisting of AMEO-, bis-AMEO AMEO- and tris hydrochloride having a chloride content of 6.2 wt .-% have been in a stirred apparatus at 50 0 C added with 143 g of toluene and cooled to 25 0 C. Subsequently, a NaOH solution (35.5 g NaOH, 114.6 g H 2 O) was added and the solution stirred vigorously for 30 seconds. The phase separation occurred spontaneously. The aqueous phase was drained off. The resulting NaCl was completely dissolved in the aqueous phase and the pH of the aqueous phase was 14.
• Example 8 125.0 g of a yellow residue consisting of bis-ammonium and tris-ammonium hydrochloride with a chloride content of 9.1 wt .-% in a stirred apparatus at 50 0 C with 125 g Toluene added and cooled to 25 0 C. Subsequently, a NaOH solution (15.5 g NaOH, 50.0 g H 2 O) was added and the solution stirred vigorously for 30 seconds. The phase separation occurred spontaneously. The aqueous phase was drained off. The resulting NaCl was completely dissolved after adding 10 g of H2O in the aqueous phase and the pH of the aqueous phase was 14.
• the aqueous phase was drained off.
• the resulting NaCl was completely dissolved in the aqueous phase and the pH of the aqueous phase was 14.
• the organic phase was freed from cyclohexane under reduced pressure at 80 ° C.
• the product was filtered.
• a clear, yellow-colored liquid with a hydrolyzable chloride content of 720 ppm by weight was obtained.
• the internal standard GC analysis showed 23.2 wt% DAMO, 56.2 wt% bis-DAMO, 5.6 wt% Tris-DAMO. The yield was 85%.

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