Isolation of 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide from waste water from its preparation
Patent
·
OSTI ID:6508626
3-Isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide (bentazone) is isolated from waste water, originating from its preparation and working up, by treating the waste water with an acid to bring the pH initially to 7.5-9.5, adding 0.2-0.5% by volume, based on the waste water, of a 40-60 percent strength by weight aqueous bentazone salt solution and heating the mixture for 15-30 minutes at 75/sup 0/-110/sup 0/ C. The solution thus treated is then cooled and brought to pH 1-3 with a mineral acid, whereupon the bentazone precipitates in a form which can be filtered off.
- Assignee:
- BASF Aktiengesellschaft (Germany, Federal Republic of)
- Patent Number(s):
- US 4451378
- OSTI ID:
- 6508626
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACIDIFICATION
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
AZOLES
BENZOTHIAZOLES
COOLING
DISPERSIONS
FILTRATION
HEATING
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LIQUID WASTES
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PRECIPITATION
SEPARATION PROCESSES
SOLUTIONS
THIAZOLES
WASTE WATER
WASTES
WATER
400105* -- Separation Procedures
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACIDIFICATION
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
AZOLES
BENZOTHIAZOLES
COOLING
DISPERSIONS
FILTRATION
HEATING
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LIQUID WASTES
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PRECIPITATION
SEPARATION PROCESSES
SOLUTIONS
THIAZOLES
WASTE WATER
WASTES
WATER