Abstract: Acetaldehyde is prepared by reacting methyl acetate and/or dimethyl ether with carbon monoxide and hydrogen in the presence of a palladium catalyst and an iodine moiety in a reaction zone wherein the reaction mixture is in a continuous boiling state.

Abstract: Residual products obtained in the catalytic dehydration of alpha-methylbenzyl alcohol are treated to recover monomeric styrene values by a process which comprises fractionally distilling the residual products in two stages under different temperature and time conditions.

Abstract: A catalyst composition useful for the oxidation of unsaturated aldehydes, particularly the oxidation of methacrolein to produce methacrylic acid, comprises the combination of oxides of molybdenum, copper, phosphorus, antimony, and calcium in predetermined relative atomic ratios.

Abstract: A catalyst composition useful for the oxidation of unsaturated aldehydes, particularly the oxidation of methacrolein to produce methacrylic acid, comprises the combination of oxides of molybdenum, copper, phosphorus, antimony, calcium and rhenium in predetermined relative atomic ratios.

Abstract: A catalyst composition useful for the oxidation of unsaturated aldehydes, particularly the oxidation of methacrolein to produce methacrylic acid, comprises the combination of oxides of molybdenum, copper, phosphorus, antimony, calcium, tungsten and optionally arsenic in predetermined relative atomic ratios.

Abstract: In the carbonylation of alkyl esters in the presence of a Group VIII noble metal catalyst to produce a reaction mixture comprising volatile components and the non-volatile Group VIII noble metal catalyst, and the volatile components are separated from the catalyst, catalyst activity is maintained by providing a partial pressure of hydrogen of at least 10 psi during the separation of the volatile products. A partial pressure of at least 15 psi of carbon monoxide is also preferably provided, particularly when a metal promoter for the Group VIII noble metal catalyst is present, during such separation.

Abstract: Trivalent thallium values are extractively recovered from aqueous media containing dissolved trivalent and monovalent thallium values by contacting the aqueous medium in the presence of an alkanoic acid, having from 2 to 4 carbon atoms per molecule and having a molecular weight of at least 74 grams per gram-mol of acid, with an inert, organic, non-acidic solvent for the alkanoic acid, said solvent having limited solubility in water, to preferentially extract at least a portion of the dissolved trivalent thallium values into the organic solvent extractant and recovering an extract comprising the organic solvent containing the extracted trivalent thallium values.

Abstract: This invention relates to the preparation of molybdenum acid salts by directly reacting the carboxylic acid with a molybdenum compound while removing the water that is formed. These molybdenum acid salts are useful as catalysts in such processes as in the epoxidation of olefins.