Donald B Loftis

US Patent:

53187628, Jun 7, 1994

Filed:

Dec 9, 1992

Appl. No.:

7/988060

Inventors:

David W. Cawlfield - Cleveland TN
Donald B. Loftis - Cleveland TN
Sanders H. Moore - Cleveland TN
Elizabeth K. Walter - Cleveland TN

Assignee:

Olin Corporation - Cheshire CT

International Classification:

C01B 2120
C07C23908

US Classification:

423387

Abstract:

A process for treating solutions of a hydroxylammonium salt containing excess acid which comprises: a) mixing the hydroxylammonium salt containing excess acid with a hydroxylammonium solution containing free hydroxylamine to produce a solution of the hydroxylammonium salt substantially free of excess acid, b) contacting a portion of the solution of the hydroxylammonium salt substantially free of excess acid with a weak base ion exchange resin to produce the hydroxylammonium solution containing free hydroxylamine, and, c) recycling the hydroxylammonium solution containing free hydroxylamine to step a). The process minimizes the decomposition of the hydroxylammonium salt solution and produces high purity hydroxylammonium nitrate solutions without directly contacting excess nitric acid with ion exchange resins. In addition to hydroxylammonium salts, the process can be used to treat any nitrate salt of an anine weak base which contains excess nitric acid.

US Patent:

50238035, Jun 11, 1991

Filed:

Apr 10, 1989

Appl. No.:

7/335315

Inventors:

Donald B. Loftis - Cleveland TN
David D. Justice - Cleveland TN

Assignee:

Olin Corporation - Cheshire CT

International Classification:

G06F 1546

US Classification:

364497

Abstract:

A process to control the addition of excess carbonate to brine systems is provided wherein the process measures the raw brine flow rate through the carbonate reactors, the concentration of calcium in the brine feeding the reactors and the concentration of carbonate in the sodium carbonate feed tank to calculate the quantity of sodium carbonate necessary to remove substantially all of the calcium impurity in the brine by precipitating it out as a calcium carbonate flocculant. The process is automated and employs an information feed forward system.

US Patent:

51856930, Feb 9, 1993

Filed:

Jan 29, 1992

Appl. No.:

7/827920

Inventors:

Donald B. Loftis - Cleveland TN
David W. Cawlfield - Cleveland TN

Assignee:

Olin Corporation - Cheshire CT

International Classification:

G06F 1120
G06F 1546

US Classification:

364187

Abstract:

In a backup mode of operation a process control program sends messages, via a local area network, to a process control program running in an active mode for the purpose of obtaining current values of process control data and configuration information. If the active process control program fails to respond to an interrogation by the backup process control program the backup program automatically activates itself to assume the active role. The activation procedure includes a sequence that transmits a control pulse of predetermined width on a line of an associated process control bus to a novel digital data switch. The receipt of a valid control pulse causes the digital data switch to allow access by the backup (now active) data processor to process control I/O unit(s) while simultaneously isolating the active (now backup) data processor from the I/O units. If a response is received the backup processor receives and stores within a memory current process related data such that in the event the backup processor is required to assume the active processor functions the backup processor is fully cognizant of the current state of the process control environment. The switch may also include a watch dog timer for monitoring activity of at least one bus signal line associated with the active data processor for indicating an occurrence of a failure of the active data processor.