Stephen T Gaddis

US Patent:

7645435, Jan 12, 2010

Filed:

Apr 26, 2004

Appl. No.:

10/831859

Inventors:

Victor E. Braman - Green River WY, US
Marco A. Cortes - Green River WY, US
Falcon A. Price - Green River WY, US
Stephen T. Gaddis - Green River WY, US
Todd M. Lessard - Green River WY, US
James M. Shepard - Wilmington DE, US
Derral W. Smith - Green River WY, US

Assignee:

General Chemical Industrial Products, Inc. - East Hanover NJ

International Classification:

C01D 7/12

US Classification:

423427, 4232062

Abstract:

A process is described for recovering sodium carbonate or other sodium-based chemicals from sodium-bearing streams, including in particular mine water, evaporative pond water and sodium carbonate decahydrate deposits, recycle and purge streams, and other waste streams. In the process sodium bicarbonate-bearing streams are decarbonized to reduce the sodium bicarbonate concentration in a combination with other sodium-bearing streams, resulting in a liquor suitable as feed to a sodium carbonate decahydrate or sodium carbonate monohydrate process. The sodium bicarbonate stream is combined in a mix tank with other sodium carbonate bearing streams where the concentration is adjusted to form a liquor suitable to feed a sodium decahydrate or sodium carbonate monohydrate evaporation/crystallization step. In the process the combination of the various sodium-bearing streams is decarbonized to below 3. 5% sodium bicarbonate when fed to a sodium decahydrate process and to below 1% sodium bicarbonate when fed to a sodium carbonate monohydrate process.

US Patent:

20030143149, Jul 31, 2003

Filed:

Jan 31, 2002

Appl. No.:

10/061477

Inventors:

Victor Braman - Green River WY, US
Marco Cortes - Green River WY, US
Falcon Price - Green River WY, US
Stephen Gaddis - Green River WY, US
Todd Lessard - Green River WY, US
James Shepard - Wilmington DE, US
Derral Smith - Green River WY, US

International Classification:

C01D007/00

US Classification:

423/426000

Abstract:

A process is described for recovering sodium carbonate or other sodium-based chemicals from sodium-bearing streams, including in particular mine water, evaporative pond water and sodium carbonate decahydrate deposits, recycle and purge streams, and other waste streams. In the process selected sodium bicarbonate-bearing streams are decarbonized to reduce the sodium bicarbonate concentration in a combination with other sodium-bearing streams, resulting in a liquor suitable as feed to a sodium carbonate decahydrate or sodium carbonate monohydrate process. The sodium bicarbonate concentration can be reduced using any number of known processes such as reacting said sodium bicarbonate with a neutralizing agent such as calcium oxide, calcium hydroxide, sodium hydroxide, or other alkali. Sodium bicarbonate can also be stripped using steam or air. The sodium bicarbonate reduced stream is combined with other sodium-bearing streams where the concentration is adjusted to form a liquor suitable to feed a sodium decahydrate or sodium carbonate monohydrate evaporation/crystallization step. Alternatively, the decarbonized stream can be concentrated using sodium carbonate decahydrate crystals formed from said sodium carbonate decahydrate process. Additionally, waste streams dilute in sodium carbonate concentration can be heated, especially with waste process heat, and recycled to existing sodium carbonate decahydrate deposits in evaporation ponds prior to combining said stream with other waste streams, purge streams, recycle streams, or sodium decahydrate crystals with the intention of recovering sodium carbonate from such streams and deposits and further processing the resulting liquor through an evaporation/crystallization step whereby various selected sodium carbonate salts are produced. The combination of the various sodium-bearing streams is decarbonized to below 3.5% sodium bicarbonate when fed to a sodium decahydrate process and to below 1% sodium bicarbonate when fed to a sodium carbonate monhydrate process. The feed streams are adjusted in sodium carbonate concentration by higher concentrated sodium carbonate-bearing streams or by addition of sodium carbonate decahydrate produced from said streams or recovered form evaporation pond deposits, are then processed to produce sodium carbonate decahydrate or sodium carbonate monohydrate or further processed to form other sodium carbonate salts.

US Patent:

60752122, Jun 13, 2000

Filed:

Sep 11, 1998

Appl. No.:

9/151635

Inventors:

Mark Alan Lee - Green River WY
Stephen Tremayne Gaddis - Green River WY

Assignee:

General Chemical Corporation - Parsippany NJ

International Classification:

G01G 900
G01G 1952
G01G 1900
G01G 2122

US Classification:

177145

Abstract:

An apparatus and method for accurately weighing a rail car coupled to other rail cars without uncoupling the rail car to be weighed includes a hydraulically operated positioning device assembly with opposed pushers that can be elevated to hold the axle of a rail car uptrack of the car to be weighed, a scale mounted downtrack of the rail car positioning device, and a car stop mounted downtrack of the scale that can be elevated to block the wheels of a car downtrack of the car being weighed. The rail car positioning device engages the car uptrack of the car to be weighed, moves the car to be weighed over the scale, and, by reversibly moving the car, centers the car over the scale. The car stop then engages the downtrack car to maintain it and other cars coupled to it downtrack in a fixed position during weighing and filling of the car on the scale. The carriage assembly then releases the car on the scale and moves uptrack where it acquires a hold on the next empty car.

US Patent:

56364490, Jun 10, 1997

Filed:

Oct 26, 1995

Appl. No.:

8/548658

Inventors:

Stephen T. Gaddis - Green River WY
Thomas B. Barker - Green River WY

Assignee:

General Chemical Corporation - Parsippany NJ

International Classification:

D06F 5800

US Classification:

34124

Abstract:

A tube dryer system is used to remove moisture from solid commercial products. The present apparatus includes a condensate vessel that separates condensed steam from excess steam. The excess steam is passed through a thermocompressor and combined with incoming fresh steam to produce a combined steam feed stream having a higher flow rate at only slightly reduced pressure and reduced superheat content, resulting in increased dryer capacity and reduced steam losses with no increase in energy costs.