GB817843A - Improvements in and relating to anionic permselective membranes - Google Patents

Improvements in and relating to anionic permselective membranes

Info

Publication number
GB817843A
GB817843A GB3902/57A GB390257A GB817843A GB 817843 A GB817843 A GB 817843A GB 3902/57 A GB3902/57 A GB 3902/57A GB 390257 A GB390257 A GB 390257A GB 817843 A GB817843 A GB 817843A
Authority
GB
United Kingdom
Prior art keywords
solution
parchment paper
dicyanodiamide
formaldehyde
impregnated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3902/57A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SOUTH AFRICAN COUNCIL SCIENTIF
Original Assignee
SOUTH AFRICAN COUNCIL SCIENTIF
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SOUTH AFRICAN COUNCIL SCIENTIF filed Critical SOUTH AFRICAN COUNCIL SCIENTIF
Publication of GB817843A publication Critical patent/GB817843A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/20—Manufacture of shaped structures of ion-exchange resins
    • C08J5/22—Films, membranes or diaphragms
    • C08J5/2206—Films, membranes or diaphragms based on organic and/or inorganic macromolecular compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/47—Condensation polymers of aldehydes or ketones
    • D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
    • C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

In preparing anionic perm-selective membranes for use in the electrodialytic purification of saline water, parchment paper is impregnated, at room temperature, with an aqueous solution of pH 2.5 to 10.0, containing one or more guanidinium salts and formaldehyde, and then dried and cured at a temperature of, at least, 110 DEG C. Suitable guanidinium salts are the nitrate and chloride, e.g. mixed with the carbonate. The solution may also contain melamine, or, alternatively, dicyanodiamide mixed, e.g. with furfurol or glyoxal. Ammonium carbonate, chloride or nitrate may be added to the solution. Alternatively, parchment paper may be impregnated with an aqueous solution containing dicyanodiamide, hexamethylene-tetramine, formaldehyde, hydrochloric acid and, if desired, urea. The unimpregnated parchment paper may be swelled by treating it with strong orthophosphoric acid and then leaching out the acid. Specifications 750,220, 750,238, [both in Group XXXVI], 813,606, [Group VIII], and 813,607, [Group XXXVI], are referred to.ALSO:Parchment paper is impregnated, at room temperature, with an aqueous solution of pH 2.5 to 10.0 containing one or more guanidinium salts and formaldehyde and is then dried and cured at a temperature of, at least, 110 DEG C. to form an anionic perm-selective membrane. Suitable guanidinium salts are the nitrate and chloride, e.g. mixed with the carbonate. The solution may also contain melamine or, alternatively, dicyanodiamide mixed, e.g. with furfurol or glyoxal. Ammonium carbonate, chloride or nitrate may be added to the solution. Alternatively, parchment paper may be impregnated with an aqueous solution containing dicyanodiamide, hexamethylene - tetramine, formaldehyde, hydrochloric acid and, if desired, urea. It is stated that the presence in the impregnating solution of a derivative of cyanamide not containing the guanidine structure, e.g. urea, introduces cross-linkages. Specifications 750,220, 750,238, [both in Group XXXVI], 813,606, [Group VIII], and 813,607, [Group XXXVI], are referred to.
GB3902/57A 1956-08-03 1957-02-05 Improvements in and relating to anionic permselective membranes Expired GB817843A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA817843X 1956-08-03

Publications (1)

Publication Number Publication Date
GB817843A true GB817843A (en) 1959-08-06

Family

ID=25575838

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3902/57A Expired GB817843A (en) 1956-08-03 1957-02-05 Improvements in and relating to anionic permselective membranes

Country Status (1)

Country Link
GB (1) GB817843A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003098205A1 (en) * 2002-05-21 2003-11-27 Rhocraft Research And Development Ltd. Ion exchange membranes and dissolved gas sensors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003098205A1 (en) * 2002-05-21 2003-11-27 Rhocraft Research And Development Ltd. Ion exchange membranes and dissolved gas sensors

Similar Documents

Publication Publication Date Title
IE35878B1 (en) Dialysis and ultrafiltration of a liquid
ES431623A1 (en) Process of preparing aqueous solutions of melamine-formaldehyde condensation products having anionic sulfo groups
GB1152596A (en) Improvements in Reverse Osmosis and Membrane Manufacture.
GB817843A (en) Improvements in and relating to anionic permselective membranes
ES245221A1 (en) Process for producing concentrated urea-formaldehyde solutions by absorbing gaseous formaldehyde in aqueous urea solutions
GB424535A (en) Improvements in processes of impregnating cellulosic fabrics
GB981362A (en) Production of decausticized polysaccharide xanthates and their utilization
GB640085A (en) Improvements in and relating to the making of dry adhesive films and laminated structures cemented together with said films
GB683410A (en) Production of impregnating agent for treating fibres or fibrecontaining substances and objects
GB1439808A (en) Process for the recovery of guanidine carbonate from aqueous solution
GB1288621A (en)
GB948749A (en) Improvements in the production of paper
GB1509000A (en) Composition and process for treating timber
GB988026A (en) Permanent finishes for cellulosic articles
GB898299A (en) Improvements relating to the treatment of cellulosic fabrics
Burkitt et al. New Catalysts for Resin Finishing
JPS5624415A (en) Production of amino resin containing less unreacted formaldehyde
AT229581B (en) Process for the preparation of a stable solution of a melamine-formaldehyde condensation product
GB822587A (en) Processes for the preparation of solutions of amylose, and for the production of films, sheets, fibres and the like therefrom and articles thereof
GB1082089A (en) Improvements in or relating to water treatment
GB921058A (en) Improvements in or relating to the treatment of cellulose textile materials
GB755477A (en) Improvements in or relating to method of drying improved cationic urea-formaldehyde resins
GB813606A (en) Improved cationic perm-selective membranes and the process of producing them
GB974284A (en) Preparation of hydroxocobalamin
GB875907A (en) Temperature control process for making urea-formaldehyde resin fertilizers