Method for recovering sulfuric acid from concentrated acid...

Details Method for recovering sulfuric acid from concentrated acid... Method for recovering sulfuric acid from concentrated acid...

2008-07-29

2011-11-08

Vanoy, Timothy (Department: 1734)

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C536S127000, C127S037000, C127S046100, C127S047000, C127S058000

Reexamination Certificate

active

08052953

ABSTRACT:
A method for recovering sulfuric acid from concentrated acid hydrolysate of plant cellulose material is disclosed. In some of the examples, the concentrated acid hydrolysate is mixed with a liquid organic precipitant, with the sugars in the hydrolysate being precipitated and separated out. The remainder is sulfuric acid and an organic solvent solution. The organic solvent is then separated by distillation or extraction, thereby obtaining the pure sulfuric acid solution. This precipitation method can recover above 90% sugars and acids with a small amount of organic precipitant, which greatly reduces the recovery cost.

REFERENCES:
patent: 1917539 (1933-07-01), Miles
patent: 4237110 (1980-12-01), Forster et al.
patent: 4608245 (1986-08-01), Gaddy et al.
patent: 5562777 (1996-10-01), Farone et al.
patent: 6007636 (1999-12-01), Lightner
patent: 101157445 (2008-04-01), None
patent: WO 02/02826 (2002-01-01), None
patent: WO 2006/085763 (2006-08-01), None
International Search Report dated Oct. 30, 2008, issued in corresponding international application No. PCT/CN2008/071801.
International Preliminary Report on Patentability, and Written Opinion of the International Searching Authority issued Mar. 24, 2010 in corresponding International Application PCT/CN/2008/071801.

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