1. A process for enameling a glass sheet, comprising:
applying a liquid composition to a glass sheet at a glass sheet temperature of at least 300\xb0 C., the liquid composition comprising:
a hydrolysate of at least one metal alkoxide,
a solvent having a boiling point of at least 180\xb0 C., and
a glass frit.
2. The process according to claim 1, wherein the solvent is polar.
3. The process according to claim 1, the solvent is a polyether comprising at least one hydroxyl (OH) end group or a polyalcohol.
4. The process according to claim 1, wherein the solvent is a polyether comprising at least one hydroxyl (OH) end group.
5. The process according to claim 1, wherein the solvent has a boiling point of at least 200\xb0 C.
6. The process according to claim 1, wherein the solvent has a boiling point of at least 220\xb0 C.
7. The process according to claim 1, wherein the solvent has a boiling point of at least 240\xb0 C.
8. The process according to claim 1, wherein the solvent has a boiling point of at least 280\xb0 C.
9. The process according to any of claim 1, wherein the liquid composition further comprises at least one pigment.
10. The process according claim 1, wherein the metal of the at least one metal alkoxide is selected from the group consisting of silicon, titanium, zirconium, aluminium, cerium and zinc.
11. The process according to claim 1, wherein the at least one metal alkoxide is an alkoxysilane.
12. The process according to claim 1, wherein the liquid composition is applied by spraying with at least one nozzle.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A process for separating a reaction output which is obtained in the reaction of Ethylenediaminediacetonitrile (EDDN) or Ethylenediaminemonoacetonitrile (EDMN) with hydrogen in the presence of tetrahydrofuran(THF) and of a catalyst and which comprises Triethylenetetramine (TETA) or Diethylenetriamine (DETA) and water, with or without organic compounds having higher and lower boiling points than TETA or DETA, wherein
i) the reaction output after removal of hydrogen is supplied to a distillation column DK1 in which a THFwater azeotrope is removed via the top and which may also comprise further organic compounds having a lower boiling point than TETA or DETA, and in which a bottom product comprising TETA or DETA is removed, and
ii) passing the bottom product from stage i) into a distillation column DK2 and THF is removed via the top, and a stream comprising TETA or DETA is drawn off at the bottom of the column, and
iii) the stream from stage i) drawn off at the top of column DK1 is condensed and an organic solvent which is essentially immiscible with water is fed into the condensate or a portion of the condensate in such an amount that phase separation occurs, and the mixture thus obtained is separated in a phase separator, the organic phase which forms, comprising THF and the organic solvent which is essentially immiscible with water, being recycled into column DK1 and the water phase being discharged.
2. The process according to claim 1, wherein the EDDN andor EDMN are prepared by conversion of Ethylenediamine (EDA), Formaldehyde (FA) and HCN.
3. The process according to claim 1, wherein the bottoms output from column DK1 has a water content of less than 1% by weight.
4. The process according to claim 3, wherein the water content in the bottoms output from column DK1 has a water content of less than 300 ppm by weight.
5. The process according to claim 1, wherein the bottom product from distillation column DK2 is passed in stage ii) into a distillation column DK3 in which toluene is drawn off via the top and the bottom product drawn off is a stream comprising predominantly TETA or DETA or Aminoethylpiperazine (AEPIP).
6. The process according to claim 5, wherein the pressure in the entire distillation column DK3 is less than 300 mbar.
7. The process according to claim 1, wherein the bottom product from column DK3 is passed into a column DK4 in which a mixture of Piperazine (PIP), Aminoethylpiperazine (AEPIP) and DETA is obtained at the top, a mixture of pentamines and other high boilers is obtained at the bottom, and a TETA stream with a purity of more than 99% by weight is drawn off as a side draw.
8. The process according to claim 1, wherein the bottom product from column DK3 is passed into a column DK4 in which a mixture of Piperazine (PIP), Aminoethylpiperazine (AEPIP) and DETA is obtained at the top, a mixture of Tetraethylenepentamine (TEPA) and other high boilers is obtained at the bottom, and a TETA stream with a purity of more than 99% by weight is drawn off as a side draw.
9. The process according to claim 7, wherein the pressure in the entire distillation column DK4 is less than 100 mbar.
10. A process for preparing TETA andor DETA which comprises reacting EDDN andor EDMN with hydrogen in the presence of THF and a catalyst, which comprises separating the reaction output according to claim 1.
11. A process for preparing epoxy resins, amides or polyamides, which comprises in a first stage preparing TETA or DETA by the process according to claim 10, and in a second stage converting the TETA or DETA thus obtained to epoxy resins, amides or polyamides.