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IT1056147B - Cation exchange membrane of fluoro polymer - with sulphonyl gps. modified by amination, for electrolysis of alkali chlorides - Google Patents

Cation exchange membrane of fluoro polymer - with sulphonyl gps. modified by amination, for electrolysis of alkali chlorides

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Publication number
IT1056147B
IT1056147B IT5178075A IT5178075A IT1056147B IT 1056147 B IT1056147 B IT 1056147B IT 5178075 A IT5178075 A IT 5178075A IT 5178075 A IT5178075 A IT 5178075A IT 1056147 B IT1056147 B IT 1056147B
Authority
IT
Italy
Prior art keywords
gps
sulphonyl
electrolysis
cation exchange
exchange membrane
Prior art date
Application number
IT5178075A
Other languages
Italian (it)
Original Assignee
Diamond Shamrock Corp
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
Priority claimed from US05/587,047 external-priority patent/US4081349A/en
Application filed by Diamond Shamrock Corp filed Critical Diamond Shamrock Corp
Application granted granted Critical
Publication of IT1056147B publication Critical patent/IT1056147B/en

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Abstract

A cation exchange membrane comprising a fluoro polymer with sulphonyl gps. in the side chains, has one surface which has been treated with a polyamine to convert most of the sulphonyl gps. to a depth of >10u to gps. of formula SO2NRR'NRR" (where R is H, Na or K. R' is 3-6C alkylene, Z2N(R") gp. or ZN(R")Z2N(R") gp. Z is 2-6C alkylene and R" is R or -SO2). The pref. polymer is a copolymer of tetrafluoroethylene and a monomer of formula CF2=CFYfSO2F (where Yf is a 2-8C bifunctional aliphatic gp) and it has a mol. wt. of 1100-1200 per proton equiv. Also claimed is an electrolytic cell using the above membrane between anode and cathode. Used for electrolysis of alkali chlorides for prodn. of Cl and alkali metal hydroxides, the amine modified side of the membrane facing the cathode. Migration of OH ions back intot the anode compartment is prevented resulting in reduced formation of chlorate and oxygen and increased current yield.
IT5178075A 1975-06-16 1975-10-15 Cation exchange membrane of fluoro polymer - with sulphonyl gps. modified by amination, for electrolysis of alkali chlorides IT1056147B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/587,047 US4081349A (en) 1974-10-16 1975-06-16 Polyamine modified membranes and chlor-alkali electrolysis cells employing same
US51516675A 1975-10-16 1975-10-16

Publications (1)

Publication Number Publication Date
IT1056147B true IT1056147B (en) 1982-01-30

Family

ID=27058420

Family Applications (1)

Application Number Title Priority Date Filing Date
IT5178075A IT1056147B (en) 1975-06-16 1975-10-15 Cation exchange membrane of fluoro polymer - with sulphonyl gps. modified by amination, for electrolysis of alkali chlorides

Country Status (1)

Country Link
IT (1) IT1056147B (en)

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