Eric C Xu

US Patent:

8216423, Jul 10, 2012

Filed:

Mar 26, 2010

Appl. No.:

12/661907

Inventors:

Eric Chao Xu - Miamisburg OH,

Assignee:

Andritz Inc. - Muncy PA

International Classification:

D21C 9/16
D21B 1/02
D21B 1/04

US Classification:

162 25, 162 26, 162 52, 162 56, 162261, 241 27, 241 28, 8107, 8111

Abstract:

The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applying chemicals such as alkaline peroxide at the primary refiner. This is implemented in the preferred embodiment, by pre-treating feed material, refining the materials into a pulp in a superatmospheric refiner, and adding chemicals in the post refining blowline.

US Patent:

8262851, Sep 11, 2012

Filed:

Jul 18, 2007

Appl. No.:

11/826837

Inventors:

Johann Aichinger - Pregarten,
Eric Xu - Fairborn OH,
Marc J. Sabourin - Beavercreek OH,

Assignee:

Andritz Inc. - Glens Falls NY

International Classification:

D21B 1/02
D21B 1/16

US Classification:

162 25, 162 24, 162 28

Abstract:

A non-compression vessel, such as a digester, is employed for the chemical preconditioning of the chips followed by a fiberizing device to break the preconditioned chips down to fiber bundles, which are then washed before a high consistency chemical treatment. The digester may be one such as used in conventional chemical pulping of wood with or without screens for the extraction of chemical. If extracted this chemical could be recirculated to the digester with treatment in the circulation loop such as heating or the addition of dilution or other chemicals. This digester may be hydraulic or vapor phase (that is contain a vapor space within the digester), and operate in either a continuous or batch fashion. This digester allows for the discharge of material without the use of a screw mechanism. The digester treated material is then defiberized to convert the chips into course fiber bundles, which then is washed and dewatered.

US Patent:

2004006, Apr 15, 2004

Filed:

Oct 2, 2003

Appl. No.:

10/677545

Inventors:

Eric Xu - Miamisburg OH,

International Classification:

D21C003/00

US Classification:

162/078000

Abstract:

The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applying chemicals such as alkaline peroxide at the primary refiner. This is implemented in the preferred embodiment, by pre-treating feed material, refining the materials into a pulp in a superatmospheric refiner, and adding chemicals in the post refining blow-line.

US Patent:

2010018, Jul 29, 2010

Filed:

Mar 26, 2010

Appl. No.:

12/661909

Inventors:

Martin Herkel - Vienna,
Thomas Pschorn - Lennoxville,
Eric Chao Xu - Miamisburg OH,

International Classification:

D21B 1/12

US Classification:

162 26

Abstract:

A process for applying chemicals, such as an alkaline peroxide pretreatment () to lignocellulosic material before chemical refining and at the primary refiner (). The preferred embodiment comprises (i) preconditioning at temperatures below 95° C., especially below 80° C., (ii) limiting the time and/or temperature in the refiner, (iii) reaction quench to maintain temperatures below 80° C., and (iv) subsequent high consistency bleaching ().