A method for the hydrolysis of cellulosic materials using spent liquor. The spent liquor is derived from a pulping operation or is hydrolyzate from another cellulosic biomass process. The process can be implemented in a batch or semi continuous or continuous process. The hydrolyzate is fermented to a useful product and purified. Combustible biomass residues …

Legal parties

Inventors (applicants): Vesa Pylkkanen, Theodora Retsina
Assignees (initial): API Intellectual Property Holdings, LLC (Atlanta, US)
Agents: Ryan P. O'Connor (attorney)

The application was examined by Melvin C Mayes (USPTO dept. 1732), Colette Nguyen


  • 1. A process of hydrolyzing a cellulosic biomass feedstock into monomer sugars, said process comprising …
  • 2. The process of claim 1 , wherein said cellulosic biomass feedstock contains hemicelluloses. …
  • 3. The process of claim 1 , wherein said spent liquor media is spent pulping …

Cited documents


  • Whittingham US 4278471 A / 127/37, Jul. 1, 1981
  • Foody et al. US 2009/0023187 A1 / 435/72, Jan. 1, 2009
  • Klyosov et al. US 5777086 A / 530/500, Jul. 1, 1998
  • Heikkila et al. US 7722721 B2 / 127/46.2, May. 1, 2010


Brief Description of the Drawings

A more complete understanding of the present invention may be obtained by reference to the following detailed description when read in conjunction with the accompanying drawings wherein: FIG. 1 . Illustrates …



1. Field of the Invention This invention relates, in general, to the hydrolysis of cellulosic and hemicellulosic material to produce fermentable sugars. The process utilizes pulping spent liquor as hydrolysis …

Priority Data

This patent application is a non-provisional application claiming priority to provisional patent application No. 61/064,397, filed on Mar. 4, …

Detailed Description of the Invention

A process for hydrolyzing cellulosic material into sugars through a staged treatment with spent liquor from another process—first step—and acid is described comprising the steps of: Comminuting cellulosic biomass and feeding …

More details about Method for Hydrolysis of Biomass in Pulping Spent Liquor

Miscellaneous patent data

The claim number 1 is selected as exemplary, developed by Vesa Pylkkanen et al., 21 claims comprise the protection scope, the inventor's state is GA, city - Atlanta, the inventor's name is Pylkkanen Vesa, located in Atlanta (US), the assignee company is API Intellectual Property Holdings, LLC, the application publication date is Mar. 3, 2009, the grant publication date is Apr. 1, 2014, the drawings include the following: flow sheet example of the invention, Method for Hydrolysis of Biomass, the invention details are shown in 1 figures, the examination was conducted by Colette Nguyen, the assistant, Melvin C Mayes, the main examiner (1732 USPTO department), numbered 12/397,284 (application), the invention description is illustrated by 1 drawings, the patent particularly claims a process of hydrolyzing a cellulosic biomass feedstock into monomer sugars, said…, the assignee is a United States company, the patent grant was extended by 632 days, originally classified under Cellulose material, the applicant's location - Atlanta, GA, the applicant's first name is Theodora, and his last name is Retsina, the grant number is 08685167, the invention is titled Method for Hydrolysis of Biomass in Pulping Spent Liquor, the published agent's name is Ryan P. O'Connor, similar classification categories are Chemical, Fructose, Multiple stage, Tubular cell, obtained by saccharification of starch or raw materials containing starch, Crystallisation, Treating solid sugar or crystals, Invert sugar, Separation of glucose or fructose from invert sugar, Treating sacchariferous solutions, Sugars not otherwise provided for in this class.

Invention classification information

The invention is classified under obtained by saccharification of cellulosic materials, Carbohydrate manufacture and refining, Cellulose material, Acid reagent followed by precipitant, Hydrolysis of carbohydrates. The designated search classifications include Substrate contains cellulosic material, Cellulose material, Lactic acid, Preparing compound containing saccharide radical, Monosaccharide.

Patent details
Publication number 08685167
Publication date Apr. 1, 2014
Kind code B2
Application number 12/397,284
Application date Mar. 3, 2009
Application type U
Application series code 12
Extension term 632
National classification 127/37
Total number of claims 21
Exemplary claims 1
Number of drawings 1
Number of figures 1
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