Process for producing peracids from aliphatic hydroxy carboxylic acids
This patent describes a wood pulp processing system of the type producing both pulp and a stream of lactic acid-containing black liquor solution, the processor for production of peracid bleaching agents from hydroxy acid contained in the black liquor solution, comprising: adjusting the pH of the black liquor solution to the range of about 8-9 by exposing the solution to CO/sub 2/ carbon dioxide to form an alkaline precipitate; separating solids from the black liquor solution to produce a residual solution containing lower aliphatic hydroxy acids selected from the group consisting of lactic acid, glycolic acid, 2-hydroxybutanoic acid, xyloisosaccharinic acid, and glucoisosaccharinic acid; decarboxylating the lower aliphatic hydroxy acids to corresponding gaseous aliphatic aldehydes by admixing a powdered semiconductor with the residual solution to form a slurry; removing the gaseous aldehydes from the residual solution by sweeping gas flow as soon as they are generated to prevent further oxidation to carboxylic acids; reacting the gaseous aldehydes with oxygen to form corresponding peracids; and applying the peracids as bleaching agents to the pulp produced in the pulp processing system.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4617090
- OSTI ID:
- 5079484
- Country of Publication:
- United States
- Language:
- English
Similar Records
Process for producing peracids from aliphatic hydroxy carboxylic acids
Process for producing peracids from aliphatic hydroxy carboxylic acids
Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALDEHYDES
BLEACHING
BUTYRIC ACID
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISTRY
DECARBOXYLATION
DISPERSIONS
ELECTROCHEMISTRY
FLUID FLOW
GAS FLOW
GLYCOLIC ACID
GRADED BAND GAPS
HYDROXY ACIDS
IRON COMPOUNDS
IRON OXIDES
IRRADIATION
LACTIC ACID
MATERIALS
MIXING
MIXTURES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHOTOCHEMICAL REACTIONS
REFRACTORY METAL COMPOUNDS
SEMICONDUCTOR MATERIALS
SLURRIES
SOLID WASTES
SUSPENSIONS
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
WASTES
WOOD WASTES