Patent GB-450309-A (GB)
Title: Improvements in and relating to the treatment of liquids and gases by absorption and in particular to treatment of liquids for the removal or exchange of anions
IPC: B01J41/12
Filed: 1934-11-13
Abstract: Resinous products obtained by the action of aldehydes on aromatic amines are used as adsorbents or absorbents in the treatment of liquids and gases.  The treatment of liquids may be with a view to the removal or replacement of anions.  Treatment of a liquid with such a product may be combined with treatment with resins as described in Specification 450,308, for the removal or exchange of cations.  Formaldehyde, acetaldehyde and furfur aldehyde are mentioned as suitable aldehydes: aniline, m - toluidine, m - ethylaminobenzene, syn-m-xylidine and m-phenylenediamine and the corresponding ortho-substituted substances as suitable aromatic amines.  The removal of the sulphate ions from a solution of calcium sulphate and from tap water by means of a resin obtained by treating aniline dissolved in hydrochloric acid with formaldehyde is described.  The resins may be treated with alkali before use and may be regenerated after use by treatment with hydrochloric acid or alkali.  The successive treatment of water with a quebracho tannin resin and a m-phenylene resin is also described.  The products are stated to have considerable absorptive capacity for sulphur dioxide and gaseous hydrochloric acid.  According to the Provisional Specifications absorbent bodies are obtained by the action of aldehyde on substances containing one or more NH2 groups, and on substances classified as albuminoids and proteins, for example hide powder, casein and gelatine.ALSO:Resinous products obtained by the action of aldehydes or aromatic amines, are used as adsorbents or absorbents in the treatment of liquids and gases.  The treatment of liquids may be with a view to the removal or replacement of anions. Treatment of a liquid with such a product may be combined with treatment with resins as described in Specification 450,308 for the removal or exchange of cations Formaldehyde, acetaldehyde and furfuraldehyde are mentioned as suitable aldehydes; aniline, m-toluidine, m-ethylaminobenzene, synm-xylidine and m-phenylene-diamine and the corresponding ortho-substituted substances as suitable aromatic amines.  The removal of the sulphate ions from a solution of calcium sulphate and from tap water by means of a resin obtained by treating aniline dissolved in hydrochloric acid with formaldehyde are described.  The resins may be treated with alkali before use and may be regenerated after use by treatment with hydrochloric acid or alkali.  The successive treatment of water with a quebracho-tannin resin and a m-phenylene diamine resin is described.  The products are stated to have considerable absorptive capacity for sulphur dioxide and gaseous hydrochloric acid. According to the Provisional Specifications absorbent bodies are obtained by the action of aldehyde on substances containing one or more NH2 groups, and on substances classified as albuminoids and proteins, for example hide powder, casein and gelatine.ALSO:Resinous products obtained by the action of aldehydes on aromatic amines are used as adsorbents or absorbents in the treatment of liquids and gases.  The treatment of liquids may be with a view to the removal or replacement of anions.  Treatment of a liquid with such a product may be combined with treatment with resins as described in Specification 450,308 for the removal or exchange of cations.  Formaldehyde, acetaldehyde and furfuraldehyde are mentioned as suitable aldehydes: aniline, m - toluidine, m - ethylaminobenzene, syn - m - xylidine and m-phenylene-diamine and the corresponding ortho-substituted substances as suitable aromatic amines.  The removal of the sulphate ions from a solution of calcium sulphate and from tap water by means of a resin obtained by treating aniline dissolved p  in hydrochloric acid with formaldehyde is described.  The resins may be treated with alkali before use and may be regenerated after use by treatment with hydrochloric acid or alkali.  The successive treatment of water with a quebracho-tannin resin and a m-phenylene diamine resin is described.  The products are stated to have considerable absorptive capacity for sulphur dioxide and gaseous hydrochloric acid. According to the Provisional Specifications absorbent bodies are obtained by the action of aldehyde on substances containing one or more NH2 groups, and on substances classified as albuminoids and proteins, for example, hide powder, casein and gelatine.