The Dow Chemical Company

G Edwin Vrieland

Hans R Friedli

Craig B Murchison

Bijan Khazai

Stephen R Betso

Edwin C Steiner

Bart J Bremmer

Duane F Foye

Ravi S Dixit

Stephen J Doktycz

Richard E Crooks

Edwin D Weihl

A process for preparing olefins and diolefins in high productivity which involves contacting an aliphatic hydrocarbon, such as butane, with a heterogeneous catalyst composition containing reactive oxygen under reaction conditions sufficient to produce a more highly unsaturated aliphatic hydrocarbon, such as 1,3-butadiene. The catalyst composition contains a glassy silica matrix of specified surface area and macro-porosity into which are encapsulated domains of a catalyst component containing oxides of magnesium and molybdenum. The catalyst has high crush strength and is useful in transport reactors.

Process of oxidizing aliphatic hydrocarbons employing a molybdate

A process for the production of olefins and diolefins, such as 1,3-butadiene, comprising contacting an aliphatic hydrocarbon, such as butane, with a heterogeneous catalyst composition containing reactive oxygen under reaction conditions such that a more highly unsaturated aliphatic hydrocarbon is selectively formed in a high productivity. The catalyst is a composition comprising (a) a support component of magnesia and alumina and/or magnesium aluminate spinel, and (b) a catalyst component of magnesia, an oxide of molybdenum, a Group IA metal oxide promoter, and optionally vanadium oxide. Catalysts of high surface area and high attrition resistance are claimed.

A process for the production of unsaturated aliphatic hydrocarbons, such as diolefins, comprising contacting an aliphatic hydrocarbon, such as an alkane or a monoolefin, with a solid heterogeneous catalyst containing labile oxygen under reaction conditions such that a more highly unsaturated aliphatic hydrocarbon is selectively formed in a high space-time yield. The catalyst comprises an oxide of magnesium, an oxide of molybdenum, an alkali metal promoter, and optionally an oxide of vanadium. For example, butane is oxidized in the presence of magnesium molybdate doped with alkali metal oxide to a mixture of products including predominantly butadiene and cis-2-butene and trans-2-butene.

Process of oxidizing aliphatic hydrocarbons employing an alkali-promoted

The present invention is a polymeric composition with improved extrudability comprising a vinylidene chloride interpolymer and a Group IIA alkaline-earth hydroxyphosphate, which is incorporated with the vinylidene chloride interpolymer by advance addition, polymer slurry addition or, finally, by dry blending addition. The Group IIA alkaline-earth hydroxyphosphate will be present in an amount of between about 0.01 to about 5 weight percent, said weight percents being based on the total weight of the polymeric composition.

Extrudable polymeric compositions

Olefins such as propylene can be oxidized to their epoxides by contacting gaseous olefin with oxygen in the presence of an unsupported silver catalyst. This catalyst is promoted with 30 to 1300 ppm (weight) magnesium relative to the silver.

Olefin oxidation catalyst of unsupported silver containing low levels of

A process for producing 4-bromotetrachloropyridine or symmetrical tetrachloropyridine in high purity comprises the selective transhalogenation of pentachloropyridine by a bromide salt in a polar aprotic solvent at a temperature from about 100.degree. C. to about 140.degree. C. followed optionally by selective debromination by hydrogen in the presence of a noble metal catalyst and an acid acceptor to form tetrachloropyridine.

Process for preparing 4-bromotetrachloropyridine

The nuclear iodine substituents borne by an iodopyridine are displaced by introducing gaseous chlorine into the mixture at a temperature of from about 100.degree. C. to about 250.degree. C. The displacement of iodine produces chloropyridines, which can then be conveniently separated from the liberated iodine by conventional methods such as distillation.

Process for displacing nuclear iodine with chlorine in iodipyridines

Magnesium nickel pyrophosphate is a superior catalyst for oxydehydrogenating alkyl aromatic compounds including nitrogen heterocyclics which have at least one C.sub.2 -C.sub.6 alkyl side chain to form derivatives having side chain unsaturation. The alkyl aromatic compound can have 1-2 rings. The process is carried out at 450.degree.-650.degree. C. and a space velocity of 55-2500.

Catalyst and method of oxydehydrogenation of alkyl aromatic compounds

Certain alkaline earth pyrophosphates, such as Ca, Mg, and Sr pyrophosphates are superior catalysts for oxydehydrogenating alkyl aromatic compounds including nitrogen heterocyclics which have at least one C.sub.2 -C.sub.6 alkyl side chain to form derivatives having side chain unsaturation. The alkyl aromatic compound can have 1-2 rings. The process is carried out at 450.degree.-650.degree.C. and a space velocity of 55-2500.

Method of oxydehydrogenation of alkyl aromatic compounds

Alkaline earth-nickel phosphates having from about 61% to about 70% phosphate are superior catalysts for oxydehydrogenating alkyl aromatic compounds including nitrogen heterocyclics which have at least one C.sub.2 -C.sub.6 alkyl side chain to form derivatives having side chain unsaturation. The alkyl aromatic compound can have 1-2 rings. The process is carried out at 450.degree.-650.degree.C. and a space velocity of 55-2500.

Lanthanum phosphate, lanthanum pyrophosphate and rare earth phosphates and pyrophosphates containing a major portion of that lanthanum compound are good catalysts for oxydehydrogenating alkyl aromatic compounds, including nitrogen heterocyclics having at least one C.sub.2 -C.sub.6 alkyl side chain to form derivatives having side chain unsaturation. The alkyl aromatic compound can have 1-2 rings. The process is carried out at 450.degree.-640.degree.C. and a space velocity of 55-2500.

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Midland, MI, United States of America

G Edwin Vrieland