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
- Country of Publication:
- United States
- Language:
- English
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ACID RAIN
AEROSOL WASTES
AIR POLLUTION MONITORING
AMINO ACIDS
AQUEOUS SOLUTIONS
ASHES
ATMOSPHERIC PRECIPITATIONS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CYSTEINE
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IRON COMPOUNDS
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MIXTURES
NITROGEN COMPOUNDS
NITROGEN OXIDES
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ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PROCESSING
RAIN
RECOVERY
RECYCLING
RESIDUES
SEPARATION PROCESSES
SLURRIES
SOLUTIONS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SUSPENSIONS
THIOLS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES