Abstract:
Unsaturatea carboxylic acids and/or esters thereof are produced by reacting an aldehyde comprising formaldehyde or acetaldehyce with either a saturated carboxylic acid ester or anhydride in the vapour phase in the presence as catalyst of a high silica crystalline aluminosilicate zeolite in which the cation is H + and/or a transition metal and/or a rare earth metal. In a modification of the process instead of formaldehyde there is used methanol/molecular oxygen and in the catalyst there is included either an oxidative or an oxidative/ dehydrogenative component.
Abstract:
A process for the production of a catalyst based on a crystalline aluminosilicate having a silica to alumina molar ratio greater than 12:1 which is obtained by mixing a source of silica, a source of alumina, a source of alkali metal, water and a source of ammonium ions in defined proportions, crystallising the mixture, recovering the crystalline aluminosilicate so-formed, cation-exchanging and/or impregnating the recovered crystalline aluminosilicate and finally calcining, wherein either the recovered crystalline aluminosilicate or the cation-exchanged aluminosilicate or the impregnated aluminosilicate is washed with a solution containing either an organic base, a carboxylic acid, an alcohol, a glycol, a phenol or an ester. The washing treatment results in a reduction in the rate of decline in catalytic activity in reactions such as the conversion of aliphatic to aromatic hydrocarbons.
Abstract:
Oxygenated hydrocarbons are produced by reacting in a liquid medium carbon monoxide and hydrogen in the presence of a particulate catalyst comprising a supported rhodium component at an elevated temperature, typically in the range 150 to 300°C and an elevated pressure, typically greater than 50 bars. Suitable liquid media include water, an alcohol, a Carboxylic acid, an ester, a ketone, an ether or an aromatic hydrocarbon. The rhodium catalyst may be supported on silica and is desirably combined with other metals.
Abstract:
Ethanol is produced by reacting methanol with hydrogen and carbon monoxide at elevated temperature and pressure in the presence of a catalyst comprising cobalt, an iodide or a bromide and a compound having the formula X(A)(B)(C) in which formula X is nitrogen or phosphorus and A, B and C are individually monovalent organic radicals, or X is phosphorus and any two of A, B and C together form an organic divalent cyclic ring system bonded to the X atom, or X is nitrogen and all of A, B and C form an organic trivalent cyclic ring system bonded to the X atom, and in the additional presence of an added inert liquid which is characterised as a compound capable of forming, under normal conditions of temperature and pressure, a separate phase in the presence of methanol containing up to 20% w/w water, which compound contains in its structure bonds other than carbon/carbon and carbon/hydrogen. Typical of the inert liquids which may be employed are chlorobenzene, decanoic acid, polydimethylsiloxane fluid and methyl phenyl silicone fluid. The addition of the inert liquid suppresses' side-reactions and thereby increases the total yield and selectivity to ethanol.