Patent GB-450308-A (GB)
Title: Improvements in and relating to the removal of components or constituents from liquids by adsorption or absorption
IPC: B01J39/18
Filed: 1934-11-13
Abstract: Synthetic resins obtained by treating polyhydric phenols, or tannins or other derivatives thereof, with formaldehyde or an equivalent methylene body are used as adsorbents or absorbents in the treatment of liquids and gases and for their base-exchange action in the treatment of liquids.  Similar resins produced from a mixture of polyhydric phenols or tannins with monohydric phenols may also be used.  The resins may be prepared with more than one molecular proportion of formaldehyde or under such conditions that silica is present in the product.  The use of resins obtained from catechol tannin, quebracho tannin, catechin, tannic acid, gallic acid, resorcinol quinol, pyrogallol, phloroglucinol, and dihydroxynaphthalene is described; also that of mixed resins obtained from m-cresol and resorcinol, m-cresol and gallic acid, m-cresol and quebracho tannin, synthetic tannin and quebracho tannin, resorcinol and quebracho tannin, and resorcinol and gallic acid.  The use of the resins for removing the metals from solutions of iron, calcium, bismuth and lead salts and of alkalies, and for softening water is described.  The separation of aniline and pyridine from aqueous and alcoholic solutions is also mentioned.  The mixed resins are stated to have considerable powers of absorption for ammonia, triethylamine, carbon dioxide, sulphuretted hydrogen and ethylene.ALSO:Synthetic resins obtained by treating polyhydric phenols or tannins or other derivatives thereof with formaldehyde or an equivalent methylene body are used as adsorbents or absorbents in the treatment of liquids and gases.  Similar resins produced from a mixture of polyhydric phenols or tannins with monohydric phenols may also be used.  The resins may be prepared with more than one molecular proportion of formaldehyde or under such conditions that silica is present in the product.  The use of resins obtained from catechol tannin, quebracho tannin, catechin, tannic acid, gallic acid, resorcinol quinol, pyrogallol, phloroglucinol and dihydroxynaphthalene is described; also that of mixed resins obtained from m-cresol and resorcinol, n-cresol and gallic acid, m-cresol and quebracho tannin, synthetic tannin and quebracho tannin, resorcinol and quebracho tannin, and resorcinol and gallic acid.  The use of the resins for removing the metals from solutions of iron, calcium, bismuth and lead salts and of alkalies, and for softening water is described.  The separation of aniline and pyridine from aqueous and alcoholic solutions is also mentioned.  The mixed resins are stated to have considerable powers of absorption for ammonia, triethylamine, carbon dioxide, sulphuretted hydrogen and ethylene.ALSO:Synthetic resins obtained by treating polyhydric phenols, or tannins or other derivatives thereof, with formaldehyde or an equivalent methylene body, are used as adsorbents or absorbents in the treatment of liquids and gases and for their base-exchange action in the treatment of liquids.  Similar resins produced from a mixture of polyhydric phenols or tannins with monohydric phenols may also be used.  The resins may be prepared with more than one molecular proportion of formaldehyde or under such conditions that silica is present in the product.  The use of resins obtained from catechal tannin, quebracho tannin, catechin, tannic acid, gallic acid, resorcinal, quinol, pyrogallol, phloroglucinol, and dihydroxy-naphthalene is described; also that of mixed resins obtained from m-cresol and resorcinal, m-cresol and gallic acid, m-cresol and quebracho tannin, synthetic tannin and quebracho tannin, resorcinal and quebracho tannin, and resorcinal and gallic acid.  The use of the resins for removing the metals from solutions of iron, calcium, bismuth and lead salts and of alkalies, and for softening water is described.  The separation of aniline and pyridine from aqueous and alcoholic solutions is also mentioned.  The mixed resins are stated to have considerable powers of absorption for ammonia, triethylamine, carbon dioxide, sulphuretted hydrogen and ethylene.