Exxon Research and Engineering Company

Allied Chemical Corporation

Omicron Technology Corporation

Wim J Pieters

William E Gates

Emery J Carlson

Eric G Derouane

Arie Bortinger

Rees T Baker

Rexford D Sherwood

Yoshiharu Okumura

John E Wilkalis

Robert A Maggio

Franz Wenger

Lawrence L Murrell

Guido P Pez

Dane C Grenoble

Elena N Suciu

Kenneth A Gould

Gerard M Prilutski

William C Conner, Jr

A process for preparing a zeolite, e.g. ZSM-5, under controlled conditions of pH adjustment with an acid; SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio, and in the substantial absence of alkali metal cations, is disclosed, as well as a process for using the same to synthesize olefins from methanol and/or dimethyl ether.

Process for synthesizing a zeolite catalyst on a pH controlled sodium

A process for preparing a zeolite, e.g. ZSM-5, under controlled conditions of initial pH adjustment with an acid, SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio, and in the presence of sodium cations, is disclosed, as well as a process for using the same to synthesize olefins from methanol and/or dimethyl ether.

Process for synthesizing a zeolite catalyst on a pH controlled basis to

A process for improving the catalyst life of zeolites employed in the conversion of alcohols (e.g. methanol) and/or their ether derivatives (e.g. dimethyl ether) wherein a suitable zeolite is modified in a 2-stage procedure by providing a controlled low amount of a coke precursor deposit on the external surface of the zeolite, and then heating this treated zeolite in an inert gas at specifically controlled temperatures for a minimum time is disclosed. A process of employing this modified zeolite to produce lower olefins is also disclosed.

Two stage process for improving the catalyst life of zeolites in the

A process for improving the catalyst life of zeolites employed in the conversion of alcohols (e.g. methanol) and/or their ether derivatives (e.g., dimethyl ether) wherein a suitable zeolite is modified in a 2-stage procedure by providing a controlled low amount of a coke precursor deposit on the external surface of the zeolite, and then heating this treated zeolite in an inert gas at specifically controlled temperatures for a minimum time is disclosed. A process of employing this modified zeolite to produce lower olefins is also disclosed.

Methods for determining the amount of a gas adsorbed or desorbed from a solid sample wherein a gas is introduced or withdrawn from a sample containing chamber at a substantially constant mass flow rate while measuring the pressure change within said chamber as a function of time is disclosed. An apparatus for conducting said method which uses a mass flow controller is also disclosed.

Method and apparatus for determining the amount of gas adsorbed or

An apparatus capable of selecting and controlling the mass flow rate of a gas to be substantially constant over extended periods of time at very low flow rates and very low gas partial pressures is disclosed.

Mass flow controller apparatus

Phenolic compounds are dehydroxylated in the vapor phase by contacting with a reducing atmosphere substantially comprising hydrogen sulfide as the reducing agent in the presence of a sulfur-tolerant metal sulfide catalyst. The additional presence of hydrogen gas helps to desulfurize the catalyst and maintain catalytic activity. The process is useful in the treatment of phenolic naphtha fractions present in coal liquids, produced by pyrolysis or direct coal liquefaction.

Catalytic dehydroxylation of phenols

Basic asphaltenes are selectively removed from asphaltene-containing hydrocarbon feeds by contacting the feed with a transition metal oxide solid acid catalyst exhibiting Bronsted acidity. The catalyst selectively adsorbs the basic asphaltenes. The catalysts will comprise a catalytic metal component selected from the group consisting essentially of oxides of (a) tungsten, niobium and mixtures thereof and (b) mixtures of (a) with tantalum, hafnium, chromium, titanium, zirconium and mixtures thereof, supported on pyrogenic alumina. Asphalt-laden catalyst is separated from the feed, the asphaltenes adsorbed thereon are cracked off in the presence of steam and the catalyst is regenerated and recycled back to the adsorption zone.

Separating basic asphaltenes using Bronsted acid transition metal oxide

A composition of matter and method for the preparation thereof wherein said composition comprises a film of chemically wetted metal phase essentially a monolayer thick on graphite wherein said metal is selected from the group consisting essentially of Ni, Co, Mo and mixtures thereof. These metal films exhibit strong metal-support interaction and do not exhibit properties of the bulk metal.

Chemically wetted film of metal phase on graphite and process for

Carbon is gasified with steam in the presence of a catalytic metal such as nickel by forming a dispersion of the metal on graphite wherein the average particle size of the dispersed metal is below about 100 A and preferably below 25 A in diameter and contacting the dispersed metal/graphite composite with steam at about 800.degree. C. or higher to gasify the graphite. This process will also gasify mixtures of graphite and amorphous carbon.

Process for catalytically gasifying carbon

A process for forming a dispersion of metal selected from the group consisting essentially of Ni, Co, Mo and mixtures thereof on graphite comprising heating a composite of said metal on graphite at a temperature between about 800.degree.-975.degree. C. in an inert, hydrogen-containing atmosphere to form metal-containing channels in the graphite, raising the temperature to at least about 975.degree. C. so that the metal in the channels spreads out and chemically wets the surface of the channels as a film of metal phase, followed by contacting the so-formed metal-wetted, channeled composite with an oxidizing atmosphere to break up the film of metal phase into discrete metal particles. The average diameter of the particles is generally below about 25 A and the preferred metal is nickel.

Process for forming highly dispersed metal on graphite

An improved process is described for producing chlorotrifluoroethylene, a useful monomer for making high strength chlorofluoropolymers, comprising passing a mixture of 1,1,2-trichloro-1,2,2-trifluoroethane, ethylene, hydrogen chloride and elemental oxygen in the vapor phase, at a temperature from about 350.degree. to 525.degree. C., over a catalyst consisting essentially of a mixture of copper chloride and an alkali metal chloride, preferably a eutectic mixture, occluded in a molecular sieve, having an average pore size diameter in the range of about 5 to 11 angstroms. A new catalyst composition is also described, useful in oxyhydrochlorination processes conducted at temperatures above 350.degree. C., consisting essentially of a mixture of copper chloride and an alkali metal chloride, preferably a eutectic mixture, occluded in a molecular sieve, having an average pore size diameter in the range of about 5 to 11 angstroms.

Process for producing chlorotrifluoroethylene

Hydrogen contamination of chlorine-containing gas, such as the chlorine gas from the electrolytic chlorine/caustic process and especially the tail gas from the chlorine liquefaction operation, is eliminated by reaction of the hydrogen directly in the gas mixture at elevated temperature in the presence of a catalyst, to effect combination of the hydrogen with chlorine to form hydrogen chloride, followed by scrubbing of the hydrogen chloride from the gas.

Removal of low concentrations of hydrogen from chlorine gas

Catalyst and process for the production of chlorofluorinated hydrocarbons are disclosed by reacting a hydrocarbon with HCl, HF and an oxygen-containing gas under oxychlorofluorination conditions in the presence of a catalytic composition comprising magnesium and copper ions each in combination with fluoride ions and an alkali metal ion, or mixtures thereof, in combination with chloride ions.

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Morristown, NJ, United States of America

Wim J Pieters