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document
Lopez Serrano, P. (author), Cao, L. (author), Van Rantwijk, F. (author), Sheldon, R.A. (author)
The invention relates to a method of preparing cross-linked enzyme aggregates (CLEAs) comprising the steps of a) precipitating a dissolved enzyme present in a liquid medium; b) cross-linking with a cross-linker, and c) optionally, washing the cross-linked enzyme aggregate. According to the invention at least one treatment is performed chosen...
patent 2002
document
Dakka, J. (author), Sheldon, R.A. (author), Sanderson, W.A. (author)
Abstract of GB 2309655 (A) Heterogeneous catalysts comprising one or more metal compounds selected from the group consisting of tin, molybdenum, tungsten, zirconium and selenium compounds deposited on the surface of a silicalite are provided. Preferably Sn(IV) and/or Mo(VI) are employed. The catalysts are prepared by reacting a metal halide...
patent 1997
document
Dijksman, A. (author), Arends, I.W.C.E. (author), Sheldon, R.A. (author)
The invention relates to a method of oxidizing an alcohol to form an aldehyde or ketone using a ruthenium ion and oxygen in the presence of a substantially stable N-O free radical compound, wherein two atoms bound to the nitrogen atom are not themselves hydrogen carriers. It has been found that with such a combination of a ruthenium ion and...
patent 2000
document
De Zoete, M.C. (author), Van Rantwijk, F. (author), Sheldon, R.A. (author)
Abstract of WO 9507359 (A1) A process for carrying out enzymatically catalyzed conversions of organic compounds comprises reacting an ester of an organic acid in a liquid organic phase with ammonia in the presence of a hydrolytic enzyme such as a lipase, esterase or protease. The process permits the highly enantioselective preparation of...
patent 1995
document
Verspui, G.A. (author), Sheldon, R.A. (author)
Use of an acid catalyst to improve yields in the preparation of polyketones in aqueous medium by polymerising a mixture of CO and alkylenically unsaturated hydrocarbons in the presence a catalyst composition comprising a group VIII metal and a ligand. Process for preparing a polyketone in aqueous medium by polymerising a mixture of CO and an...
patent 1999
document
Kroon, M.C. (author), Shariati, A. (author), Florusse, L.J. (author), Peters, C.J. (author), Van Spronsen, J. (author), Witkamp, G.J. (author), Sheldon, R.A. (author), Gutkowski, K.I. (author)
The invention is directed to a process for carrying out a chemical reaction in an ionic liquid as solvent and CO2 as cosolvent, in which process reactants are reacted in a homogeneous phase at selected pressure and temperature to generate a reaction product at least containing an end-product of the reaction, and upon completion of the reaction a...
patent 2006
document
Sheldon, R.A. (author), DONG, C.J. (author), JIHAD, D. (author)
Abstract of WO 9417021 (A1) The invention relates to an improvement in the practice of a catalyzed autoxidation of a starting material selected from (cyclo)alkanes, (cyclo)alkyl aromatics and alcohols derived therefrom. The improvement consists in the autoxidation being carried out by allowing oxygen to act on the employed starting material in...
patent 1994
document
Sheldon, R.A. (author), Chen, J.D. (author), Dakka, J. (author)
Abstract of WO 9408932 (A1) The invention relates to an improvement in carrying out a catalyzed decomposition of organic hydroperoxides. The improvement consists in the use of a heterogeneous catalyst which is composed of a three-dimensional microporous structure, a so-called molecular sieve, containing aluminum, silicon and/or phosphorus oxides...
patent 1994
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