Jean Paul Chauvel, 30Marana, AZ

5046854, Sep 10, 1991

Jan 24, 1991

7/647179

Joseph P. Weller - Lake Jackson TX
David P. Denton - Richwood TX
Sandra V. Lange - Lake Jackson TX
Chester R. Norman - Lake Jackson TX
Mary A. Leugers - Midland MI
Stuart Farquharson - Surfside TX
Jean P. Chauvel - Lake Jackson TX

The Dow Chemical Company - Midland MI

G01N 2105
G01N 2109

356440

A photometric probe or a photometric cell having separate windows and a metallic probe body or cell body. The window(s) are sealed to the probe or cell body by brazed or frit seals which are less likely to leak after extended use in high temperature and/or high pressure industrial applications than probes and cells having gasket sealed windows. The windows can be made of sapphire, cubic zirconia, diamond, ruby, glass or quartz and, in the case of the probe, can be in the shape of an Attenuated Total Reflectance prism. The probe or cell body can be Kovar alloy or stainless steel.

5151474, Sep 29, 1992

Feb 16, 1990

7/481020

Sandra V. Lange - Lake Jackson TX
David P. Denton - Richwood TX
Joseph P. Weller - Lake Jackson TX
Jean P. Chauvel - Lake Jackson TX
Stuart Farquharson - Freeport TX
Harry D. Ruhl - Midland MI
Gregory A. Winter - Lake Jackson TX

The Dow Chemical Company - Midland MI

C08F 206

526 60

A process control method for controlling a polyolefin polymerization process, such as a solution polyethylene process, which includes five steps. The first step is to flow a stream of a solvent into a polyolefin reactor, such as flowing a stream of heptane solvent into the reactor at essentially a constant rate. The second step is to add a principal monomer to the stream of solvent, such as by adding ethylene at a controllable rate to the stream of solvent. The third step is to add a co-monomer to the stream of solvent, such as by adding 1-octene at a controllable rate to the stream of solvent. The fourth step is to determine the concentration of the principal monomer and the concentration of the co-monomer in the stream of solvent by high resolution multi-wavelength vibrational spectroscopy analysis, such as by Fourier transform infrared spectroscopy system having a spectral resolution of 4 wavenumbers which analyzes at 1909 wavenumbers for ethylene, at 1829 wavenumbers for 1-octene and at 2120 wavenumbers for a reference signal. The fifth step is to control the rate of addition of the principal monomer, the rate of addition of the comonomer or preferably the rate of addition of both the principal monomer and the co-monomer according to the determination of the fourth step to obtain the desired concentration of ethylene and 1-octene in the solvent so that, for example, the density of the polyolefin product can be controlled.

2011011, May 12, 2011

Jul 22, 2009

13/001628

Sunil K. Chaudhary - Missouri City TX, US
Jean P. Chauvel - Lake Jackson TX, US
Christopher P. Christenson - Seguin TX, US
Istvan Lengyel - Lake Jackson TX, US
James P. Cosman - Sarnia, CA
John W. Weston - Sugar Land TX, US
Katie Fischer - Rosharon TX, US
David A. McCrery - Lake Jackson TX, US

Dow Global Technologies Inc. - Midland MI

C07C 41/34

568623

Disclosed is an improvement to a polyether preparation process that includes a coalescing step. Amine-initiated polyethers prepared using a mixed alkylene oxide feed tend to coalesce significantly more slowly than glycerin-initiated polyethers, particularly in processes that include a holding step and/or elevated temperature following an initial alkoxylation to form a pre-polymer. This improvement is to perform a remedial end-capping of the pre-polymer, which may include amine degradation products, using an alkylene oxide which contains at least (3) carbons, prior to the molecular weight-building alkoxylation with the mixed alkylene oxide feed. The rate and performance of coalescing thereafter may be substantially enhanced.