A process for the preparation of cysteine from cystine
This patent describes an invention which in one aspect relates to a process for the simultaneous removal of NO/sub chi/ and SO/sub 2/ from a fluid stream comprising mixtures thereof and in another aspect relates to the separation, use and/or regeneration of various chemicals contaminated or spent in the process. It includes the steps of: Contacting the fluid stream at a temperature of between about 105{sup 0} and 180{sup 0}C with a liquid aqueous slurry or solution; separating the fluid stream from the particulates formed; washing and separating the particulates with an aqueous solution having a pH value of between about 5 to 8; subsequently washing and separating the particulates with a strongly acidic aqueous solution; washing and separating the particulates with a basic aqueous solution; optionally adding additional amino acid moiety, iron (II) and alkali to the aqueous liquid to produce an aqueous solution or slurry having a pH value of between about 4 to 12; and recycling the aqueous slurry of the last step to the contacting zone of the first step.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4837361
- Application Number:
- PPN: US 7122725A
- OSTI ID:
- 5584887
- Resource Relation:
- Patent File Date: 18 Nov 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ACID RAIN
AIR POLLUTION MONITORING
CYSTEINE
RECOVERY
FLY ASH
DESULFURIZATION
FUEL SLURRIES
WASTE PROCESSING
AQUEOUS SOLUTIONS
CYSTINE
DENITRIFICATION
IRON COMPOUNDS
NITROGEN OXIDES
PARTICULATES
RECYCLING
SEPARATION PROCESSES
SULFUR DIOXIDE
AEROSOL WASTES
AMINO ACIDS
ASHES
ATMOSPHERIC PRECIPITATIONS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
DISPERSIONS
DISULFIDES
FUELS
MANAGEMENT
MIXTURES
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PROCESSING
RAIN
RESIDUES
SLURRIES
SOLUTIONS
SULFUR COMPOUNDS
SULFUR OXIDES
SUSPENSIONS
THIOLS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
400201 - Chemical & Physicochemical Properties
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)