Method and apparatus for preparing high-concentration alkali
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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May 16, 1989
Grant Date -
N/A
app pub date -
May 27, 1986
filing date -
Apr 18, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A caustic alkali solution is concentrated to high density or high caustic alkali concentration by evaporation under high pressure at elevated temperature and expansion of the thus obtained concentrated caustic alkali solution to low pressure, preferably below atmospheric pressure. The pressure difference between the high pressure evaporator and the low pressure expansion vessel is absorbed gradually by a pressure difference absorber, preferably comprising a liquid column in a U-shaped siphon tube, so that corrosion and erosion are reduced considerably.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
UBE INDUSTRIES LTD A CORP OF JAPAN | 12-32 NISHIHONMACHI 1-CHOME UBE-SHI YAMAGUCHI-KEN | |
SULZER-ESCHER WYSS AG A CORP OF SWITZERLAND | HARDSTRASSE 319 8023 ZURICH |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Kobayashi, Yakayuki | Ube, JP | 1 | 0 |
# of filed Patents : 1 Total Citations : 0 | |||
Sala, Siro | Como, IT | 2 | 0 |
# of filed Patents : 2 Total Citations : 0 | |||
Winkler, Robert | Wallisellen, CH | 9 | 21 |
# of filed Patents : 9 Total Citations : 21 | |||
Yokota, Shinjiro | Ube, JP | 4 | 19 |
# of filed Patents : 4 Total Citations : 19 |
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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