摘要:
L'invention a pour objet un catalyseur comprenant un support à base d'alumine ou de silice ou de silice-alumine, au moins un élément du groupe VIII, au moins un élément du groupe VIB et un composé organique de formule (I) dans laquelle R1, R2, R3, R4 et R5 est choisi parmi un atome d'hydrogène ou un radical hydroxyle ou un radical hydrocarboné comprenant de 1 à 12 atomes de carbone pouvant comporter en outre au moins un atome d'oxygène et R6 est choisi parmi un atome d'hydrogène, un radical hydrocarboné comprenant de 1 à 12 atomes de carbone pouvant comporter en outre au moins un atome d'oxygène, un radical méthacryloyle, un radical acryloyle ou un radical acétyle. L'invention concerne également le procédé de préparation dudit catalyseur et son utilisation dans un procédé d'hydrotraitement et/ou d'hydrocraquage.
摘要:
A hydroprocessing co-catalyst composition may comprise in an embodiment a first component comprising co-catalyst particles and a liquid carrier, and a second component comprising a dispersant and a dispersant diluent. The co-catalyst particles may be in the micron size range, and the dispersant may promote dispersion of the co-catalyst particles in materials such as the liquid carrier, the dispersant diluent, and combinations thereof. Methods of introducing a hydroprocessing co-catalyst composition into a hydroprocessing system are also disclosed.
摘要:
The present invention relates to specific acylhydrazone compounds, their use as oxidation catalysts and to a process for removing stains and soil on textiles and hard surfaces. The compounds are substituted with a specific cyclic ammonium group adjacent to the acyl group. Further aspects of the invention are compositions or formulations comprising such compounds.
摘要:
La présente invention concerne un procédé de préparation d'un composé comprenant au moins un groupe uréthane -HN-C(=O)-O, ledit procédé comprenant une étape (E) dans laquelle on fait réagir un composés (I) comprenant au moins une fonction isocyanate -N=C=O avec un composé organique (II) porteur d'au moins un groupement hydroxyle -OH, cette réaction étant effectuée en présence d'un carbène (III) utilisé à titre de catalyseur.
摘要:
The present invention provides a catalyst system and a process for the preparation of a nonracemic chiral alcohol by hydrogenation of a ketone using the catalyst system, wherein the catalyst system comprises ruthenium, a nonracemic chiral diphosphine ligand, a bidentate amine ligand, and an organic base selected from alkylamidines, alkylguanidines, aminophosphazenes, and proazaphosphatranes.
摘要:
The present invention provides a catalyst system and a process for the preparation of a nonracemic chiral alcohol by hydrogenation of a ketone using the catalyst system, wherein the catalyst system comprises ruthenium, a nonracemic chiral diphosphine ligand, an amino-thioether ligand, and a base.
摘要:
Provided are catalyst systems which produce flexible polyurethane polyester foams that are color stable, are lower in odor, and uses less catalysts than current most commonly practiced technology. The use of lower amounts of catalysts with low vapor pressure reduces worker exposure to alkaline corrosive materials, reduces pollution through less pounds of volatile organic chemicals ( VOC's) and is less expensive.
摘要:
There is provided a process for separating at least one phase transfer agent (PTA) from an organic liquid mixture containing at least one organic solvent and at least one PTA, in which the organic liquid mixture is brought into contact with one surface of a selectively permeable membrane and pressure is applied to the organic liquid mixture which causes a fraction of the organic liquid to permeate through the membrane and exit at the other surface, such that the concentration of the at least one PTA in the fraction of organic liquid which does not permeate the membrane increases while the concentration of the at least one PTA in the fraction of organic liquid which permeates through the membrane is less than the concentration of the at least one PTA in the original mixture.