Patents Represented by Attorney F. A. Sinnock

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  • Process for synthesizing a zeolite catalyst on a pH controlled basis to improve catalyst life
    Patent number: 4764356
    Abstract: 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.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: August 16, 1988
    Assignee: Exxon Research & Engineering Co.
    Inventors: Arie Bortinger, Robert A. Maggio, Wim J. M. Pieters
  • Production of tertiary olefins
    Patent number: 4691073
    Abstract: High purity tertiary olefins are obtained in extremely high yields over a sustained period by cracking alkyl tert-alkyl ethers over clay catalysts which have been treated with HF and/or HC1. Preferably temperature are 100.degree.-250.degree. C., the surface area of the catalyst is above 40 M.sup.2 /gm and the cracking step is part of a process for recovering isobutylene or isoamylene from steam cracked streams.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: September 1, 1987
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Robert C. Michaelson
  • Two stage process for improving the catalyst life of zeolites in the synthesis of lower olefins from alcohols and their ether derivatives
    Patent number: 4638106
    Abstract: 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.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: January 20, 1987
    Assignee: Exxon Research & Engineering Co.
    Inventors: Wim J. M. Pieters, Yoshiharu Okumura
  • Method of multi-stage compressor surge control
    Patent number: 4618310
    Abstract: As an improvement in an anti-surge control method for a multi-stage centrifugal compressor having interstage coolers, this invention comprises, when there is an imbalance of stage flows relative to surge, replacing recycle with warm expanded gas to the maximum extent possible that still achieves an energy saving as compared with not effecting such replacement.
    Type: Grant
    Filed: June 7, 1984
    Date of Patent: October 21, 1986
    Assignee: Exxon Research & Engineering Co.
    Inventor: Herbert D. Michelson
  • Method and apparatus for efficient recovery of heat from hot gases that tend to foul heat exchanger tubes
    Patent number: 4614229
    Abstract: A method, together with suitable apparatus therefor, is provided useful in recovering heat from a high temperature cracked hydrocarbon gas, in which a liquid wash is injected into the tubes of a vertically oriented multitube transfer line heat exchanger to minimize deposition of coke. The wash liquid is introduced into a plenum chamber located above the top tube sheet and it then flows through a perforated plate. This distributes the liquid uniformly over the plate where it flows into the tubes to dissolve and/or flux condensates and coke.
    Type: Grant
    Filed: June 20, 1983
    Date of Patent: September 30, 1986
    Assignee: Exxon Research & Engineering Co.
    Inventor: Morey E. Oldweiler