Abstract:
Maleic anhydride is obtained by oxidizing an unsaturated hydrocarbon having at least 4 carbon atoms in the presence of a catalyst comprising the oxides of tungsten and phosphorus, and at least one catalyst promoter selected from the groups consisting of a compound of a metallic element belonging to groups III A, III B, IV A and VIII of the Periodic Table; arsenic, zirconium, antimony, and niobium.
Abstract:
Process for the methylation of toluene to selectively yield para-xylene by reacting toluene with a methylating agent, such as methanol, in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, which zeolite has a silica/alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12, the catalyst having been modified by the addition thereto of phosphorus in an amount of at least 0.5 percent by weight and activated by vapor phase treatment at a temperature between about 400.degree. C. and about 650.degree. C. for at least about 1 hour with a methanol/water mixture.
Abstract:
This specification discloses, as a composition of matter, a phosphorus-containing zeolite and discloses a method for preparing it. The composition is a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12, a constraint index of about 1 to 12, and containing phosphorus incorporated with the crystal structure thereof in an amount of at least about 0.78 percent by weight. The specification also discloses the use of the composition as a catalyst for the conversion of aliphatic compounds.
Abstract:
N-alkylated arylamines are prepared by reaction of arylamines which have at least one hydrogen atom on the nitrogen, with olefins or cycloolefins which can have substituents which are inert under the reaction conditions, at temperatures from 180.degree. to 450.degree.C, in the presence of catalysts. The improvement is that silicic acid which contains from 0.1 to 30 percent by weight of phosphoric acids, based on silicic acid, is used as the catalysts and that catalytic amounts of water are employed. N-alkylated arylamines are starting materials for the manufacture of dyes, pesticides, plant protection agents and growth regulators, and can also be used as mineral oil additives.
Abstract:
Improvements in the production of alcohols by hydration of their corresponding olefins, particularly olefins having three to six carbon atoms, in the presence of an acid catalyst, wherein the improvement resides in utilizing a catalyst which is a mineral acid, preferably phosphoric acid, impregnated into a substrate in a minimum proportion necessary to catalyze the reaction, which proportion is such that substantially no acid is removed from the catalyst under hydration reaction conditions.
Abstract:
This disclosure relates to the oxidation of olefins to unsaturated aldehydes and unsaturated acids such as the conversion of propylene to acrolein and acrylic acid in the vapor phase and at an elevated temperature in the presence of a catalyst comprising phosphorus, molybdenum and tellurium dioxide supported with rhenium on an inert support and methods for preparation of the catalyst.
Abstract:
HIGHER MOLECULAR WEIGHT HYDROCARBBONACEOUS MATERIALS CONTAINING POLYNUCLEAR SUBSTANCES, SUCH AS HEAVY PETROLEUM CRUDES AND HIGHER BOILING PETROLEUM FRACTIONS, INCLUDING RESIDUAL FRACTIONS, SHALE OIL, TAR SAND OIL, OIL AND TAR FROM COAL AND COAL ITSELF ARE HYDROCRACKD AT AN ELEVATED TEPERATURE RANGING FROM 250*C. TO 500*C. AND IN THE PRESENCE OF HYDROGEN AT A HPRESSURE OF 200 TO 3000 P.S.I.G., WHILE INTIMATELY MIXED WITH A HOMOGENEOUS CONTINUOUS LIQUID PHASE CATALYST SYSTEM COMPRISING PREDOMINATELY ONE OR MORE PHOSPHORIC ACIDS THERMALLY STABLE UNDER THE HYDROCRACKING CONDITIONS, SUCH AS, PYROPHOSPHORIC ACID AND POLYPHOSPHORIC ACIDS HAVING AN EMPIRICAL ACID AND H2O:P2O5 OF 3 OR LESS, ANDA MINOR PROPORTION, E.G., 10% BY WEIGHT OF CERTAIN METAL POLYHALIDES WHICH ARE ACTIVE HYDROCRACKING CATALYST, E.G., ESPECIALLY ZINC, GALLIUM AND ANTIMONY HALIDES.
Abstract:
Systems and method for upgrading pyrolysis oil to produce greater value aromatic compounds includes combining heavy pyrolysis oil and a diluent to produce the pyrolysis oil feed withleast 30 wt. % multi-ring aromatic compounds boiling at greater than 360° C. The systems and methods include passing the pyrolysis oil feed to a fixed bed reactor having a hydrocracking catalyst that includes pellets having a particle size greater than or equal to 0.1 millimeter. The hydrocracking catalyst is a mixed metal oxide catalyst that includes a binder and mixed metal oxide particles or a supported metal oxide catalyst that includes molybdenum oxide and nickel oxide supported on a catalyst support material comprising a large-pore alumina. The methods may further include contacting the pyrolysis oil feed with the hydrogen in the presence of the hydrocracking catalyst at reaction conditions in the fixed bed reactor to produce a reaction effluent.
Abstract:
The invention relates to a process for rejuvenating an at least partially spent hydrotreating and/or hydrocracking catalyst, said catalyst comprising a group VIII metal, a group VIB metal and an oxide support, said process comprising the following steps:
a) the catalyst is regenerated, b) said regenerated catalyst is then brought into contact with an impregnation solution consisting of a mixture of water, at least one precursor of a group VIB metal, at least one precursor of a group VIII metal and at least one organic compound, the amount of organic compound introduced into the regenerated catalyst being optimized with respect to the metals already present in the regenerated catalyst and with respect to the amount of metals introduced via the impregnation solution, c) a drying step is then carried out without subsequently calcining it.