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Solvent pulping of biomass

a biomass and solvent technology, applied in the direction of continuous pulping process, inorganic base pulping, pretreatment with water/steam, etc., can solve the problems of high cost, increased cod pollution, and need for significant amounts of purchased power for electricity, and achieve high level of solvent recovery, high efficiency and effective manner

Inactive Publication Date: 2004-04-01
ANDRITZ INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a method and apparatus for economically producing cellulose pulp using solvent pulping. The technical effects of this invention include higher levels of economic practicality, improved recovery of the cooking liquor effective component, reduced COD pollution, and the ability to recover lignin and furfural. The method and apparatus use a combination of blow-back prevention, gradual pressure and temperature increase, and efficient equipment and process designs. The invention also utilizes various types of cellulose-containing biomass, such as kenaf, whole industrial hemp stalks, bamboo, and agricultural residues. The recovered cellulose fiber can be used for various purposes such as pulp manufacture, packaging materials, and dissolved pulp.

Problems solved by technology

The economic problems associated with solvent pulping have been the inability to recover a high enough percentage of the cooking liquor effective component (e.g., alcohol), the increased COD pollution as a result of the discharge of the unrecovered cooking liquor effective component, the need for significant amounts of purchased power for electricity or steam, and the need to build-in high levels of safety into the process in view of the volatility of the cooking liquor effective component.
Also, technical and / or market problems with lignin or other chemical (such as furfural) recovery for sale (often necessary for there to be any chance that solvent pulping will be economical) have been common.

Method used

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  • Solvent pulping of biomass
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  • Solvent pulping of biomass

Examples

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Embodiment Construction

[0024] FIGS. 1A, 1B and 1C schematically illustrate one exemplary form (and variations) a system can take for practicing an advantageous solvent pulping method according to the invention. FIGS. 2, 1B and 1C schematically illustrate another exemplary form (and variations) a system can take for practicing an advantageous solvent pulping method according to the invention. FIGS. 3, 4, 6 and 7 illustrate other embodiments (for example, possible changes to FIGS. 1A, 1B, 1C and 2, or separate systems) that may be utilized according to the present invention. FIG. 5 schematically illustrates another exemplary form a system can take for practicing an advantageous solvent pulping method according to the invention.

[0025] In FIGS. 1A, 1B, 1C, 2, 3, 4, 6 and 7, many of the components are similar (e.g., components 23 and 94--plug or compression screw feeders, components 24 and 98--steaming vessel or inclined steaming vessel, components 25 and 102--plug or compression screw feeders, components 28 a...

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Abstract

An apparatus and process for solvent pulping of cellulose-containing biomass utilizes at least one steaming vessel, a plug screw feeder or compression screw device, at least one super-atmospheric impregnation vessel, a solvent delignification reactor capable of operating at a pressure of 350 psig or more, and a solvent containing line for introducing solvent-containing liquor at the plug screw feeder outlet or compression screw device outlet. The process and system can also include at least one series connected pressure diffuser and optionally a retention tube downstream of each pressure diffuser to provide sufficient retention time to substantially preclude re-deposition of lignin on the cellulose fibers of the biomass, a blow tank connected to the last of the pressure diffusers and retention tubes, and vessels for multistage alcohol washing. The method steams the biomass and impregnates it with solvent to produce an aqueous slurry of biomass and solvent, delignifies the particulate biomass in the slurry, removes solvent while continuing delignification of the biomass in the slurry and while substantially precluding re-deposition of lignin on the cellulose of the biomass, reduces the pressure of the slurry; and then washes the slurry.

Description

BACKGROUND AND SUMMARY OF INVENTION[0001] Solvent pulping is a well known, though heretofore economically impractical, technique for producing cellulose pulp, primarily from wood-based cellulose (although it has been known to produce cellulose pulp by solvent pulping wheat straw and reed). The term "solvent pulping" as used herein means pulping cellulose material using organic cooking chemicals, such as (but not restricted to) aliphatic alcohols (e.g., methanol, ethanol, tert-butanol, and isopropanol) with or without a small amount of a mineral or organic acid, carboxylic acids with or without hydrogen peroxide, formic acid, sulfuric acid or other mineral acids, and / or acetic acid (with the effective component of the cooking liquor peracetic acid).[0002] The economic problems associated with solvent pulping have been the inability to recover a high enough percentage of the cooking liquor effective component (e.g., alcohol), the increased COD pollution as a result of the discharge of...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21C3/20D21C3/24
CPCD21C3/24D21C3/20
Inventor PHILLIPS, JOSEPH R.GREENWOOD, BRIANSTROMBERG, BERTIL C.PSCHORN, THOMAS
Owner ANDRITZ INC
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