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Browse Prior Art Database

ORGANIC ROUTE FOR SELENIUM PIGMENTS

IP.com Disclosure Number: IPCOM000023450D
Original Publication Date: 1977-Oct-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 253K

Publishing Venue

Xerox Disclosure Journal

Abstract

One route for the preparation of crystalline selenium is by aqueous precipitation. This disclosure involves the prepar-ation of crystalline selenium by the organic solvents technique Selenium dioxide and selenous acid are known to be selective oxidizing compounds. Selected organic solvents, which illustrate the disclosed process, are cyclohexanone and diethylketone. The process is further illustrated by the following examples:

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XEROX DISCLOSURE JOURNAL

ORGANIC ROUTE FOR SELENIUM Proposed Classification
PIGMENTS U.S. Cl. 423/508
Leon Teuscher mt. Cl, COib 19/00

One route for the preparation of crystalline selenium is by
aqueous precipitation. This disclosure involves the prepar~
ation of crystalline selenium by the organic solvents
technique

Selenium dioxide and selenous acid are known to be selective
oxidizing compounds. Selected organic solvents, which
illustrate the disclosed process, are cyclohexanone and
diethylketone. The process is further illustrated by the
following examples:

EXAMPLE I

Into 200 milliliters of cyclohexanone is dispersed 10 grams of
selenous acid. After one day of gentle stirring a thick,
amorphous, red precipitate appears. The reaction mass is
ref luxed to drive the reaction to completion and provide a 98%
yield of selenium. The reaction is illustrated by equation


(1).

(1) ~

1J +HSeO -~-~ 1~~) +Se + 2HO

2 ~ ~o 2

cyclohexanone cyclohexadione

EXAMPLE II

In 150 milliliters of diethylketone is suspended 10 grams of
selenium dioxide, Stirring, ultraviolet radiation and reflux
are applied to the reaction mass for one day. A black, pow~ dered, crystalline selenium is obtained after two washings
with methanol; the yield is 97%. The reaction is illustrated
by equation 2.

(2) CH
32COCH + SeO2 -~ CH32COCOCH + Se + H2O

Volume 2 Number 5 September/October 1977 117

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                 XEROX DISCLOSURE JOURNAL
118 Volume 2 Number 5 September/October...