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2 129 992

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IPC

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Application

98105322/25, 1998-03-17

(22)

Actual filing date

1998-03-17

(45)

Published

1999-05-10

(72)

Inventor

Panov V.P.Pakshver A.S.

(73)

Holder

Sankt-Peterburgskij Gosudarstvennyj Universitet Tekhnologii I Dizajna

METHOD OF REGENERATING EXHAUSTED CHROME TANNING SOLUTION ON LEATHER PRODUCTION ON CURRYING ENTERPRISES Russian patent published in 1999 - IPC

Abstract RU 2129992 C1

FIELD: leather industry. SUBSTANCE: fat substances and coarse solid particles are separated by commonly performed settling and filtration. Then, fine suspended particles are separated by centrifugation at rotation speed 3000 rpm for at least 2 min until residual content of suspended particles not higher than 150 mg/l is attained. Thereafter solution is mixed with hydrogen peroxide in amounts from 10 to 150% of their stoichiometric amount (provided by chemical oxygen minimum method) and UV treated for 15 to 120 min at irradiation intensity 15 to 60 kW/cu.m, while exhausted fluid is used to be mixed with fresh tanner. EFFECT: simplified process, eliminated waste, and reduced reagent consumption. 1 tbl, 3 ex

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RU 2 129 992 C1

Authors

Panov V.P.

Pakshver A.S.

Dates

1999-05-10—Published

1998-03-17—Filed

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