摘要:
Improved metal oxide nanoparticles, in particular zinc oxides, are modified with silanes. The particles obtained in this way are suitable for an improved UV protection of polymers.
摘要:
The present invention relates to a process for separating at least one first material from a mixture comprising this at least one first material and at least one second material, which comprises the following steps: (A) contacting of the mixture comprising the at least one first material and at least one second material with at least one selective hydrophobicizing agent in the presence of a suspension medium so that an adduct is formed from the at least one hydrophobicizing agent and the at least one first material but not with the at least one second material, (B) contacting of the adduct from step (A) with at least one magnetic particle which is functionalized on the surface with at least one polymeric compound having a transition temperature LCST (lower critical solution temperature) at a temperature at which the polymeric compound has hydrophobic character so that the adduct from step (A) and the at least one functionalized magnetic particle agglomerate, (C) if appropriate addition of further suspension medium to the mixture obtained in step (B), (D) separation of the agglomerate present in the suspension from step (B) or (C) from the suspension by application of a magnetic field, (E) dissociation of the agglomerate separated off in step (D) by setting of a temperature at which the polymeric compound has hydrophilic character in order to obtain the at least one first material.
摘要:
The present invention relates to a process for separating at least one first material from a mixture comprising this at least one first material and at least one second material, which comprises the following steps: (A) contacting of the mixture comprising at least one first material and at least one second material with at least one surface-active substance, if appropriate in the presence of at least one dispersant, resulting in the surface-active substance becoming attached to the at least one first material, (B) if appropriate, addition of at least one dispersant to the mixture obtained in step (A) to give a dispersion having a suitable concentration, (C) treatment of the dispersion from step (A) or (B) with at least one hydrophobic magnetic particle so that the at least one first material to which the at least one surface-active substance is bound and the at least one magnetic particle become attached to one another, (D) separation of the addition product from step (C) from the mixture by application of a magnetic field, (E) cleavage of the addition product which has been separated off in step (D) to obtain the at least one first material and the at least one magnetic particle separately.
摘要:
The present invention relates to a method for producing cosmetic preparations comprising metal oxide, where the reaction mixture which forms during the production of the particulate metal oxide is incorporated into the cosmetic preparations essentially without further work-up.
摘要:
Supported catalysts comprising a support having a mean diameter of ≦78 μm, a vanadium oxide, an antimony oxide, one or more alkali metal or alkaline earth metal oxides, and one or more oxides of tungsten, molybdenum, titanium, iron, cobalt, nickel, manganese, potassium, copper or mixtures thereof; processes for preparing said catalysts; and processes for preparing an aromatic or heteroaromatic nitrile in the presence of such a supported catalyst.
摘要:
A multimetal oxide of the formula I, Aga-cQbMcV2Od*e H2O, I where a is from 0.3 to 1.9, Q is an element selected from among P, As, Sb and/or Bi, is from 0 to 0.3, M is a metal selected from among Nb, Ce, W, Mn, Ta, Pd, Pt, Ru and/or Rh, c is from 0.001 to 0.5, with the proviso that (a-c)≧0.1, d is a number which is determined by the valence and abundance of the elements other than oxygen in the formula I and e is from 0 to 20, and also precatalysts and catalysts produced therefrom for the partial oxidation of aromatic hydrocarbons are described.
摘要:
The present invention relates to a process for preparing a polyetherol which comprises reacting at least one alkylene oxide with at least one starter compound in the presence of a catalyst of the formula I: M1p[M2qOn(OH)2(3-n)]x, (I) and to the polyetherols prepared by such a process and to their use for the synthesis of polyurethanes, as fuel additive or as surfactant.
摘要:
Multimetal oxides corresponding to the general formula (I), processes for their preparation, precatalysts containing such oxides and catalysts made therefrom for gas phase partial oxidation of hydrocarbons: Aga-cQbMcV12Od.eH2O (I)wherein a represents a number having a value of 5 to 9; Q represents an element selected from the group consisting of P, As, Sb, Bi and mixtures thereof; b represents a number having a value of 0.2 to 3; M represents a metal selected from the group consisting of Li, Na, K, Rb, Cs, Tl, Mg, Ca, Sr, Ba, Cu, Zn, Cd, Pb, Cr, Au, Al, Fe, Co, Ni, Ce, Mn, Nb, W, Ta, Mo and mixtures thereof; c represents a number having a value of less than 1; d represents a number having a value of which is determined by the valency and frequency of Ag, Q, M and V in the formula (I); and e represents a number having a value of 0 to 20; wherein the multimetal oxide has a crystal structure wherein its powder X-ray diffractogram includes reflections at at least 5 interplanar spacings selected from the group of 7.13 Å, 5.52 Å, 5.14 Å, 3.57 Å, 3.25 Å, 2.83 Å, 2.79 Å, 2.73 Å, 2.23 Å and 1.71 Å, each interplanar spacing value±0.04 Å.
摘要翻译:对应于通式(I)的多金属氧化物,其制备方法,含有此类氧化物的预催化剂和由其制备的催化剂用于烃的气相部分氧化:<?in-line-formula description =“In-line Formulas”end =“ 导线“>> Ag sub> C sub> C b> sub> 其中a表示数值为5〜9的数字,其中a表示0〜5的整数。 Q表示选自P,As,Sb,Bi及其混合物的元素; b表示数值为0.2〜3的数; M表示选自Li,Na,K,Rb,Cs,Tl,Mg,Ca,Sr,Ba,Cu,Zn,Cd,Pb,Cr,Au,Al,Fe,Co,Ni, Ce,Mn,Nb,W,Ta,Mo及其混合物; c表示小于1的数字; d表示数值,其数值由式(I)中Ag,Q,M和V的化合价和频率决定; e表示0〜20的数, 其中所述多金属氧化物具有晶体结构,其中其粉末X射线衍射图包括选自7.13,5.52,5.14,3.57,3.25,2.83,2.79,2.73的至少5个面间距的反射 Å,2.23Å和1.71Å,每个晶面间距值±0.04Å。
摘要:
The invention relates to a process for preparing cyclohexanedicarboxylic acids or derivatives thereof, such as esters and/or anhydrides, encompassing the reaction of diene/maleic acid anhydride mixtures, in particular of butadiene/maleic acid anhydride mixtures or of mixtures of maleic acid anhydrides and C5-dienes to give alkyl-substituted or unsubstituted cyclohexenedicarboxylic acid anhydrides in the condensed phase, ester formation, and then hydrogenation to give the corresponding cyclohexanedicarboxylic acid derivative, and also to the use of the cyclohexanedicarboxylic acids or derivatives thereof prepared according to the invention as plasticizers for plastics.
摘要:
The present invention relates to a catalytically active composition comprising as active component Pd and Bi and at least one element selected from the group (a) consisting of Rh, Au, Sb, V, Cr, W, Mn, Fe, Co, Ni, Na, Cs and Ba, or Pd, Rh and Bi and optionally an element selected from the group (a′) consisting of Au, Sb, V, Cr, W, Mn, Fe, Co, Ni, Pt, Cu, Ag, Na, Cs, Mg, Ca and Ba. The present invention further provides a process for dehydrogenating hydrocarbons, preferably oxo-functionalized hydrocarbons such as cyclopentanone, cyclohexanone and isovaleraldehyde, using the catalytically active composition.