David J Lebel

US Patent:

6375795, Apr 23, 2002

Filed:

Dec 1, 2000

Appl. No.:

09/726393

Inventors:

David J. Lebel - Queensbury NY
Todd S. Grace - Queensbury NY

Assignee:

Andritz-Ahlstrom Inc. - Glen Falls NY

International Classification:

D21C 1106

US Classification:

162 17, 162 47, 162 52, 162246, 162248

Abstract:

The release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system for a digester is minimized utilizing a particular arrangement associated with a pressure isolation device. Material is fed through the pressure isolation device and the pressure of the material increases from the inlet to the outlet, and the material is discharged from the pressure isolation device into a treatment vessel, such as a horizontal steaming vessel. Malodorous gases from the pressure isolation device are discharged substantially independently of the material discharged from the isolation device, and at least some of the malodorous gases discharged from the pressure isolation device are pressurized (e. g. in an eductor or thermocompressor) and reintroduced into the flow of cellulosic material downstream of the pressure isolation device (for example into the horizontal steaming vessel or a vessel downstream of it). In the horizontal steaming vessel the gases can be removed from a top portion thereof and fed to an NCG system associated with the pulp mill.

US Patent:

20020185176, Dec 12, 2002

Filed:

May 1, 2002

Appl. No.:

10/135830

Inventors:

Aaron Leavitt - Alpharetta GA, US
David Lebel - Queensbury NY, US
Patrick Pepin - Queensbury NY, US
Helena Aguiar - Alpharetta GA, US
C. Stromberg - Bolton Landing NY, US
Michael Rutter - Suwanee GA, US
Patrick Sullivan - Argyle NY, US
Keith Flint - Glens Falls NY, US
James Archambault - Fort Edward NY, US
Leslie Rathbun - Victory Mills NY, US

International Classification:

B67D005/54
D21C007/00
D21C007/12

US Classification:

137/154000, 137/171000, 137/173000, 137/197000, 137/208000, 162/246000, 162/232000, 162/237000

Abstract:

Disclosed is a pressure vessel comprising a pressurized chamber; an overflow chute having an inlet open to an upper level of the chamber, a chute passage extending from the upper level to a lower level, and a chute discharge; wherein the chute passage has a bend to defect a flow in the chute passage before the flow exits the discharge.

US Patent:

58659480, Feb 2, 1999

Filed:

Jun 7, 1995

Appl. No.:

8/473194

Inventors:

Jairo H. Lora - Media PA
John Patrick Maley - Vero Beach FL
Brian F. Greenwood - Glens Falls NY
Joseph R. Phillips - Glens Falls NY
David J. Lebel - Glens Falls NY

Assignee:

Alcell Technologies Inc.

International Classification:

D21C 102
D21C 320
D21C 324

US Classification:

162 19

Abstract:

A continuous solvent pulping process is practiced with oxygen free gas (e. g. nitrogen) purges of all major treatment vessels during the time when the process is arrested or terminated. The wood chips or other cellulosic fibrous material to be pulped is steamed in a first horizontal steaming zone at pressure of about 10-20 psi, and then in a second horizontal steaming zone at a pressure of about 20-75 psi. The first and second zones are isolated by a low pressure feeder. Steam is introduced into the material in the second steaming zone to flow cocurrently with it. Gases, including vaporized solvent (e. g. ethanol or other alcohol) are vented from the steaming zones, and solvent is added to the steamed material prior to feeding to a high pressure feeder. The high pressure feeder introduces the material into the top of a single digesting vessel, liquid and chips being separated at the top of the digester vessel without mechanical means that could cause a spark. Lignin containing liquid is withdrawn from a central portion of the digester and passed through flash tanks and ultimately for lignin and alcohol recovery.

US Patent:

56814275, Oct 28, 1997

Filed:

Jun 7, 1995

Appl. No.:

8/488245

Inventors:

Jairo H. Lora - Media PA
John Patrick Maley - Vero Beach FL
Brian F. Greenwood - Glens Falls NY
Joseph R. Phillips - Glens Falls NY
David J. Lebel - Glens Falls NY

Assignee:

Alcell Technologies Inc.

International Classification:

D21C 904
D21C 906

US Classification:

162232

Abstract:

An apparatus and process for the solvent pulping and washing of pulp using vessels purged of oxygen free gas when the process is arrested or terminated. The washing is accomplished by first continuously passing the pulp to a pressure diffuser, then to a first multi-stage drum displacer washer, and then to a second multi-stage drum displacer. In the pressure diffuser the lignin is washed out of the pulp, utilizing as wash liquid a mixture of solvent and water having a solvent concentration equal to or higher than that required by the extraction process within the digester, and at a pressure at least about 350 psi. The pressure in the second and third stages is lower, and water is the wash liquid in the third stage. Alcohol can be recovered from the spent wash liquid of the first wash stage, so that all but about ten gallons or less of alcohol per ton of pulp is recovered.

US Patent:

62840959, Sep 4, 2001

Filed:

Jan 14, 2000

Appl. No.:

9/483021

Inventors:

David J. Lebel - Queensbury NY
Todd S. Grace - Queensbury NY

Assignee:

Andritz-Ahlstrom Inc. - Glens Falls NY

International Classification:

D21C 712

US Classification:

162 17

Abstract:

The release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system for a digester is minimized utilizing a particular arrangement associated with a pressure isolation device. Material is fed through the pressure isolation device and the pressure of the material increases from the inlet to the outlet, and the material is discharged from the pressure isolation device into a treatment vessel, such as a horizontal steaming vessel. Malodorous gases from the pressure isolation device are discharged substantially independently of the material discharged from the isolation device, and at least some of the malodorous gases discharged from the pressure isolation device are pressurized (e. g. in an eductor or thermocompressor) and reintroduced into the flow of cellulosic material downstream of the pressure isolation device (for example into the horizontal steaming vessel or a vessel downstream of it). In the horizontal steaming vessel the gases can be removed from a top portion thereof and fed to an NCG system associated with the pulp mill.