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US3926947A Expired / Lapsed US ⏱️ 0.0 years remaining

Controlled pyrolysis of cellulosic materials for production of chemicals

Assignee: SRI International Inc
•
Filing: 1974-06-17
•
Granted: 1975-12-16
•
Expires: 1994-06-17
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Abstract

Abstract By treating paper, newsprint, and other waste cellulosic materials with an acidic fire retardant chemical the product spectrum formed during ensuing pyrolysis of the treated materials is reduced from approximately 60 compounds, none of which is produced in amounts justifying recovery, to a small number of principal products, including water, acetic acid, furfural, 5methyl-2-furfural and a compound produced in relatively large amounts which has been identified as 1,5-anhydro-3,4-dideoxyDelta 3- Beta -D-pyranosen-2-one. The latter compound has utility as a precursor to synthetic resins and surfactants and can be converted by oxidation to the novel compound, 1,5-anhydro-3,4dihydroxy- Delta 3- Beta -D-pyranosen-2-one.

Inventors

  • 👤 Anne E Lipska

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 12:16
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/01; C05; C05B; C05B15/00

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 1 words
1,5-ANHYDRO-3,4-DIDEOXY-$3-B-D-PYRANOSEN-2-ONE.
Claim 2
Dependent Claim 1 words
1,5-ANHYDRO-3,4-DIDEOXY-$3-B-D-PYRANOSEN-2-ONE.
Claim 3
Dependent Claim 5 words
1,5-anhydro-3,4-dihydroxy- Delta 3- Beta -D-pyranosen-2-one.
Claim 4
Dependent Claim 5 words
1,5-anhydro-3,4-dihydroxy- Delta 3- Beta -D-pyranosen-2-one.
Claim 5
Independent Claim 115 words
A method for the pyrolysis of cellulosic material to enhance the production, during pyrolysis, of at least acetic acid, furfural and 1,5-anhydro-3,4-dideoxy- Delta 3- Beta -D-pyranosen-2-one, which comprises impregnating the cellulosic material with an aqueous solution of at least one agent selected from the group consisting of phosphoric acid, monoammonium phosphate, diammonium phosphate, ammonium sulfate, and zinc sulfate, said agent being employed in the amount of from about 0.5 to 5%, based on the weight of the cellulosic material, and being characterized by the ability to react with hydroxyl groups present in cellulosic molecules to form a relatively stable bond therewith as pyrolysis is initiated, and subjecting the cellulosic material containing the agent to pyrolysis.
Claim 6
Independent Claim 115 words
A method for the pyrolysis of cellulosic material to enhance the production, during pyrolysis, of at least acetic acid, furfural and 1,5-anhydro-3,4-dideoxy- Delta 3- Beta -D-pyranosen-2-one, which comprises impregnating the cellulosic material with an aqueous solution of at least one agent selected from the group consisting of phosphoric acid, monoammonium phosphate, diammonium phosphate, ammonium sulfate, and zinc sulfate, said agent being employed in the amount of from about 0.5 to 5%, based on the weight of the cellulosic material, and being characterized by the ability to react with hydroxyl groups present in cellulosic molecules to form a relatively stable bond therewith as pyrolysis is initiated, and subjecting the cellulosic material containing the agent to pyrolysis.

References Cited (Backward Citations)

US3300473A Cited
US3309355A Cited
US3522230A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-12-15 1979-06-16 1979-12-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-12-15 1983-06-16 1983-12-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-12-15 1987-06-16 1987-12-16 $7700.00 Window Closed / Lapsed

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