摘要:
The use of modified silicon dioxide as a catalyst support in catalytic reactions under hydrothermal conditions is described. The pore structure of the supports may be stabilized against hydrothermal reaction conditions by impregnating the catalyst supports with elements of Group IVB of the Periodic Tube of Elements.
摘要:
A process is disclosed for continuously hydrogenating unsaturated fats, fatty acids or fatty acid esters on a shaped catalyst in a solid bed. The reactants flow over the catalyst in the presence of a medium or solvent mixture in supercritical conditions. This leads to considerably improved activity and selectivity of the hydrogenation reaction compared with conventional trickle bed hydrogenation processes.
摘要:
A process for the impregnating and priming treatment of mineral building materials of synthetic or natural origin using aqueous suspensions or solutions which contain at least one silicon-containing ion exchanger of the formula �(YO).sub.3 Si(CH.sub.2).sub.x !.sub.n EX (I) or an oligomer of this compound, wherein x signifies an integer of 1 to 12, n signifies an integer of 1 to 3, depending on E Y signifies H, Na, K, Mg, Ca, Ba E signifies a cation-exchanging or anion-exchanging group, and X signifies H.sup.+ or an alkali cation or alkaline earth cation or OH.sup.- or an anion, in a quantity of from 0.1 to 70% by weight, particularly from 10 to 30% by weight, based on the total quantity of the solution or suspension, with the treatment being carried out in a single stage or in multiple stages, optionally combined with a treatment with aqueous or organic emulsions or solutions containing hydrolyzable silanes and/or siloxanes.
摘要:
Disclosed are shaped organopolysiloxanes containing sulfonate groups and consisting of units(O.sub.3/2 Si--R.sup.1 --SO.sub.3.sup.-).sub.x M.sup.x+ (I)in which R.sup.1 is an alkylene group, x is a number from 1 to 4 depending on M, and M is hydrogen or a monovalent to tetravalent optionally complex metal ion, and the valencies of the silicon linked oxygen atoms are saturated by silicon atoms of other groups (I) or by crosslinking silicon and aluminum compounds, the ratio of the silicon atoms in (I) to the silicon and aluminum atoms of the crosslinker being from 1:4 to 1:20. The organopolysiloxanes containing sulfonate groups are present in the form of spherical particles with a diameter of 0.01 to 3 mm, a specific surface of 0.1 to 1200 m.sup.2 /g, a specific pore volume of 0.01 to 6 ml/g, and an apparent density of 50 to 1000 g/l. Also disclosed are processes for the production of the shaped sulfonated organopolysiloxanes and to their use as a solid acid catalyst.
摘要:
Metal-containing, shaped, polymeric, tertiary and/or secondary organosiloxane amine compounds are introduced which contain the metals Pd, Pt, Ru, Rh individually or in combination as well as optional promotors and/or moderators. The organosiloxane amine functioning as carrier for the metals contains the units ##STR1## and/or units ##STR2## in which R.sup.1 to R.sup.5 are a group ##STR3## with R.sup.6 as a double-bonded group bound to N and Si (e.g. an alkylene group) and X is an amine group such as The carrier substance can be cross-linked with cross-linking agents containing Si, Ti, Zr or Al. The metal-containing product is spherical in form and is defined by the parameters of sphere diameter, specific surface and pore volume as well as bulk density. A method of production is disclosed which can be carried out in several variants as well as the use of the metal-containing product as catalyst for hydrogenation reactions and oxidation reactions.
摘要:
This invention relates to formed, polymeric complexes of metals of the eighth subgroup of the periodic system with ligands of an organosiloxane copolycondensate optionally cross-linked by means of cross-linking agents containing Si, Ti, Zr and/or Al, in the form of statistical, block or mixed copolycondensates. The ratio between the number of moles of phosphine units and the number of moles of bound metal atoms is 1:1 to 1000 to 1 and the ratio between the amine units and the phosphine is preferably 5:95 to 95:5 mole %. The polymeric complex compounds are present macroscopically as spherical particles with a diameter in the range of 0.01 to 3.0 mm, a BET surface of greater than 0 to 1000 m.sup.2 /g, a specific pore volume of 0.01 to 6.5 ml/g and a bulk density of 50 to 1000 g/l. The invention also includes several methods of preparing the complexes with post-treatment stages and the use of the polymeric metal complexes as catalysts in organic chemistry.
摘要:
Organosiloxane copolycondensates which are optionally cross-linked by means of cross-linking agents containing Si, Ti, Zr and/or Al and comprised of the units ##STR1## and X--R.sup.4, wherein ##STR2## wherein R.sup.5 =alkylene with C.sub.1 -C.sub.10 bound directly to N or X, or cycloalkylene with C.sub.5 -C.sub.8 or ##STR3## X=--NH.sub.2, --NH--(CH.sub.2).sub.2 --NH.sub.2, --N(CH.sub.3).sub.2, --N(C.sub.2 H.sub.5).sub.2 --NH--(CH.sub.2).sub.2 --NH--(CH.sub.2).sub.2 --NH.sub.2, --Cl, --Br, --I, --SH, --P(C.sub.6 H.sub.5).sub.2, ##STR4## wherein R"=H or alkyl with C1-C5 in the form of spherical particles with a diameter of 0.01 to 3.0 mm, a specific surface of up to 1000 m.sup.2 /g, a specific pore volume of up to 6.0 ml/g and a bulk density of 50 to 1000 g/l. The formed copolycondensates can be used for removing metals from solutions and/or for the adsorption of gaseous organic compounds and/or of water vapor.
摘要:
Aminoalkyl-substituted organopolysiloxane thioureas are disclosed which consist of the units ##STR1## whereby R.sup.1 stands for a group ##STR2## R.sup.5 is an alkylene grouping, R.sup.2 is equal to R.sup.1 or H, R.sup.3 is equal to R.sup.1 or H or a group (CH.sub.2).sub.n --N(R.sup.6).sub.2 (III) (in which n=1-6, R.sup.6 =H or an alkyl group with C.sub.1 -C.sub.5) and R.sup.4 =H or a group of the formula (III), whereby (I) contains at most 2 (III) groups and at most 2 (III) groups and the free valances of the oxygen atoms sitting on the silicon atom are saturated by silicon atoms of other (III) groups, optionally with the insertion of cross-linking agents containing Si, Ti or Zr. The compounds can be random copolycondensates, block copolycondensates or mixed copolycondensates in relation to the optionally present cross-linking agents. In addition, various methods of preparing the compounds are indicated. The compounds can be used especially for the removal of dissolved metals from aqueous or organic phases.
摘要:
The invention is relative to optionally cross-linked organopolysiloxane urea derivatives and thiourea derivatives consisting of: ##STR1## wherein X stands for 0 or S andR.sup.1 is a group of the formula: ##STR2## in which R.sup.5 is alkylene with 1 to 10 C atoms or cycloalkylene with 5 to 8 C atoms or a group of the formula: ##STR3## with n=1-6 (on the nitrogen)m=0-6 (on the silicon), wherein R.sup.2 has the same meaning as R.sup.1 or stands for H, R.sup.3 and R.sup.4 have the same meaning as R.sup.1 or stands for H or alkyl with 1 to 5 C atoms. At least two but at the most three groups according to formula (2) are bound to the units according to formula (1). The free valances of the oxygen atoms bound to the silicon atom are saturated by silicon atoms of further groups of formula (2) with the optional inclusion of cross-linking agents. In addition, preparative methods for the products and a use for the removal of dissolved metals from liquid phases are indicated.
摘要:
Organosiloxane amine copolycondensates as statistic or block copolycondensates or mixtures thereof consisting of the units ##STR1## in which R.sup.1 to R.sup.5 is ##STR2## and R.sup.6 is bound directly to the nitrogen atom or the double-bonding X group and is alkylene, cycloalkylene or ##STR3## in which n is 1 to 6 and m 0 to 6. The free valences of the oxygen atoms bound to the silicon atom are saturated by silicon atoms of further groups of formula III, optionally with the inclusion of cross-linking agents, X stands for ##STR4## in which R" is H or alkyl. In addition, preparation methods and the use of the products for the removal of dissolved metals from liquid phase or for the adsorption of gaseous compounds.