Patent GB-650706-A (GB)
Title: A process for the manufacture and application of polar synthetic resins
IPC: B01D15/04
Filed: 1947-12-31
Abstract: Liquids containing organic colouring matter, e.g. Cuba black strap molasses and like sugar solutions, are decolourised by passage over granules of an aqueous gel of a synthetic aldehyde resin containing sufficient water to give a weight/volume ratio not greater than 400 gs. per litre overall volume of the close-packed resin granules.  The resins specified are aromatic amine-aldehyde condensates prepared (1) by mixing 28 litres of aniline, 40 litres water and 25 litres HCl (sp. gr. 1.19).  The mixture was cooled to 25 DEG  C. and 20 litres of 40 per cent formaldehyde added in two portions.  The solidified mass obtained was rasped to particles of 0.2-0.5 mm. and hardened by addition of a 20 per cent NaOH solution.  The particles obtained weighed less than 400 gs. per litre overall volume; (2) 130 kgs. m-phenylenediamine hydrochloride were mixed with 300 litres water and 50 litres formaldehyde added slowly.  After cooling to 10 DEG  C. a further 70 litres of formaldehyde were added; a gel having a weight of less than 400 gs. per litre was obtained.  Examples (3) and (4) specify different proportions of reactants while in (5) 40 litres of a 0.6 per cent solution of hydrogen peroxide were used instead of water.  In decolourizing sugar two tanks containing respectively a cation exchanger obtained by the reaction of sulphuric acid on coal and the resin of example (1) mounted on a layer of sand were employed and a diluted solution of Cuba black strap was passed successively through the tanks.  The total non-sugar content of the solution was reduced by the treatment from 40 per cent to 15 per cent. Specification 450,309 is referred to.ALSO:Liquids containing organic colouring matter, e.g. Cuba black strap, molasses, and like sugar solutions, are decolorized by passage over granules of an aqueous gel of a synthetic aldehyde resin containing sufficient water to give a wt/volume ratio not greater than 400 gs per litre overall volume of the close packed granules.  Resins specified are aromatic amine-aldehyde condensates prepared by (1) mixing 28 litres aniline, 40 litres water and 25 litres HC2 (sp. gr. 1.19).  The mixture is cooled to 25 DEG  C. and 20 litres 40 per cent formaldehyde added in two portions.  The solidified mass obtained is rasped to particles of 0.2-0.5 m.m. diam. and hardened by addition of a 20 per cent NoOH solution.  The particles obtained weighed less than 400 gs. per litre overall volume (2) mixing 130 kgs. m-phenylene diamine hydrochloride with 300 litres water and adding slowly 50 litres formaldehyde. After cooling 10 DEG C. a further 70 litres formaldehyde are added. Ex. (3) and (4) specify different proportions of the reactants while in (5) a 0.6 per cent solution of hydrogen peroxide is used instead of water.  In decolorizing sugar two tanks containing respectively a cation exchanger obtained by the reaction of sulphuric acid on coal and the resin of Ex(1) mounted on a layer of sand are employed and a diluted solution of Cuba black strap is passed through the tanks in series.  The total non-sugar content of the solution was reduced by the treatment from 40 per cent to 15 per cent.  Specification 450,309, [Group IV], is referred to.ALSO:Liquids containing organic coloring matter, e.g. Cuba black strap molasses and like sugar solutions, are decolorized by passage over granules of an aqueous gel of a synthetic aldehyde resin containing sufficient water to give a weight/volume ratio not greater than 400 gs. per litre overall volume of the close packed resin granules.  The resins specified are aromatic amine-aldehyde condensates prepared (1) by mixing 28 litres of aniline, 40 litres water and 25 litres HC1 (sp. gr. 1.19).  The mixture was cooled to 25 DEG C and 20 litres of 40 per cent formaldehyde added in two portions.  The solidified mass obtained was rasped to particles of 0.2-0.5 mm. and hardened by addition of a 20 per cent NaOH solution.  The particles obtained weighed less than 400 gs. per litre overall volume (2) 130 kgs. m-phenylenediamine hydrochloride were mixed with 300 litres water and 50 litres formaldehyde added slowly.  After cooling to 10 DEG C a further 70 litres of formaldehyde were added, a gel having a weight of less than 400 gs. per litre was obtained.  Ex (3) and (4) specify different proportions of reactants while in (5) 40 litres of a 0,6 per cent solution of hydrogen peroxide were used instead of water.  In decolorizing sugar two tanks containing respectively a cation exchanger obtained by the reaction of sulphuric acid on coal and the resin of Ex. (1) mounted on a layer of sand were employed and a diluted solution of Cuba black strap of 60 Bx was passed successively through the tanks.  The total non-sugar content of the solution was reduced by the treatment from 40 per cent to 15 per cent. Specification 450,309 is referred to.