PROCESS FOR REMOVING METAL IONS FROM LIQUIDS

Title:

PROCESS FOR REMOVING METAL IONS FROM LIQUIDS

Document Type and Number:

WIPO Patent Application WO1995002086

Kind Code:

A3

Abstract:

The invention is an improvement in a process for making cellulosic articles said process involving a separation of cellulosic material from a mixture containing a liquid, metal cations, and cellulosic material. The improvement involves adding to the mixture at least one retaining material which binds at least one metal cation and, in the separation, is retained with the cellulosic material. Suitable retaining agents are either organic or inorganic and include chelate-forming polymers, both synthetic and natural, colloidal suspensions of inorganic compounds, and mixed metal hydroxides. In each case, the metal cations remain in the cellulosic article, e.g. paper, rather going into waste water from which they would otherwise need to be removed.

Inventors:

MICHALOWSKI ROBERT J (US)
CHRISTIANSEN STEVEN H (US)
FRANK R KEITH (US)
LITTLETON TERESA (US)
SIMON JAIME (US)
VAUGHN WALTER (US)
WILSON DAVID A (US)

Application Number:

PCT/US1994/007428

Publication Date:

March 09, 1995

Filing Date:

June 30, 1994

Export Citation:

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Assignee:

DOW CHEMICAL CO (US)
MICHALOWSKI ROBERT J (US)
CHRISTIANSEN STEVEN H (US)
FRANK R KEITH (US)
LITTLETON TERESA (US)
SIMON JAIME (US)
VAUGHN WALTER (US)
WILSON DAVID A (US)

International Classes:

D21C9/00; D21C9/10; D21H21/06; (IPC1-7): D21C9/10; D21C9/00

Domestic Patent References:

WO1984003275A1	1984-08-30
WO1994012725A1	1994-06-09

Foreign References:

EP0073872A1	1983-03-16
US4238282A	1980-12-09

Other References: