Patent GB-495032-A (GB)
Title: A process of exchanging ions between a solution and an artificial resin
IPC: F16L27/10
Filed: 1937-05-04
Abstract: Primary aromatic amine-aldehyde resins for use as anion-exchangers are modified by introducing before, during, or after the condensation, a group or groups which enhance the basicity of the resin.  A primary aromatic aminealdehyde resin, e.g. an amino-phenol-aldehyde or a m-phenylenediamine - aldehyde resin, or an intermediate product prepared, e.g. from insufficient formaldehyde, may be after-alkylated, e.g. by methyl chloride, dimethyl-or diethylsulphate; or the primary amine may be partly or wholly replaced by more basic amines, e.g. quaternary ammonium bases, which may be aliphatic-aromatic bases containing resin-forming groups such as amino-and phenolicgroups, or tertiary amines.  In example (1) a m-phenylenediamine-formaldehyde resin is treated with dimethyl sulphate; after passing through 1 part of the unmethylated resin 70 parts of water containing 275 mg./litre of SO4" and 60 mg./litre of Cl\sv, the filtrate contains 20-25 mg./litre of Cl\sv but no SO4" and 15 parts of N-caustic soda are required for regeneration; after passing 80 parts of water through the methylated resin no SO4\sv or Cl\sv is found and 5 parts of N-caustic soda suffice for regeneration.  In example (2) a m-phenylenediamine-formaldehyde resin is modified by the inclusion of trimethyl-m-aminophenol-ammonium chloride hydrochloride; in filtering N-hydrochloric acid with the unmodified resin, Cl\sv is found in the filtrate after utilizing 50 per cent of the exchange-capacity of the resin, but with the modified resin after utilizing 95 per cent thereof.  Specification 450,309 is referred to.ALSO:Primary aromatic amine-aldehyde resins for use as anion-exchangers are modified by introducing before, during, or after the condensation, a group or groups which enhance the basicity of the resin.  A primary aromatic amine-aldehyde resin, e.g. an amino-phenolaldehyde or a m-phenylenediamine-aldehyde resin, or an intermediate product, prepared, e.g. from insufficient formaldehyde, may be after - alkylated, e.g. by methyl chloride, dimethyl- or diethyl-sulphate; or the primary amine may be partly or wholly replaced by more basic amines, e.g. quaternary ammonium bases, which may be aliphatic-aromatic bases containing resin-forming groups such as amino- and phenolic-groups, or tertiary amines.  In example (1) a m - phenylenediamine - formaldehyde resin is treated with dimethyl sulphate: after passing through 1 part of the unmethylated resin 70 parts of water containing 275 mg./litre of SO411 and 60 mg./litre of Cl1, the filtrate contains 20-25 mg./litre of Cl1 but no SO411 and 15 parts of N-caustic soda are required for regeneration; after passing 80 parts of water through the methylated resin no SO41 or Cl1 is found and 5 parts of N-caustic soda suffice for regeneration.  In example (2) a m-phenylenediamine-formaldehyde resin is modified by the inclusion of trimethyl - m - aminophenolammonium chloride hydrochloride; in filtering N-hydrochloric acid with the unmodified resin, Cl1 is found in the filtrate after utilizing 50 per cent of the resin exchange-capacity of the resin, but with the modified resin after utilizing 95 per cent thereof.  Specification 450,309 is referred to.