Method and apparatus for preparing high-concentration alkali

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United States of America Patent

PATENT NO 4830707
SERIAL NO

06879105

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
UBE INDUSTRIES LTD A CORP OF JAPAN12-32 NISHIHONMACHI 1-CHOME UBE-SHI YAMAGUCHI-KEN
SULZER-ESCHER WYSS AG A CORP OF SWITZERLANDHARDSTRASSE 319 8023 ZURICH

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kobayashi, Yakayuki Ube, JP 1 0
Sala, Siro Como, IT 2 0
Winkler, Robert Wallisellen, CH 9 21
Yokota, Shinjiro Ube, JP 4 19

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