(19)
(11) EP 0 113 592 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.01.1985 Bulletin 1985/03

(43) Date of publication A2:
18.07.1984 Bulletin 1984/29

(21) Application number: 83308016

(22) Date of filing: 29.12.1983
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI NL SE

(30) Priority: 29.12.1982 US 454188

(71) Applicant: UNION SUGAR COMPANY
 ()

(72) Inventors:
  • Chadwick, Thomas Carl
     ()
  • Voit, David Edward
     ()

   


(54) Improved method of recovering sucrose


(57) (D An improved method of recovering sucrose from plant- derived aqueous solutions is provided. The method comprises contacting an aqueous sucrose-containing solution derived from plant juice, such as sugar cane or sugar beet juice, with aliphatic carboxylic acid having an average carbon chain length of about 2-6, in a concentration sufficient to selectively precipitate a substantial amount of sucrose from the solution. The precipitate is then separated and recovered and the depleted solution can be recycled. Preferably the sucrose-containing solution is concentrated to about 55-96 Brix before the contacting and the contacting is carried out by rapidly adding the sucrose-containing solution to the acid in order to assure rapid growth of large sucrose crystals for maximum sucrose recovery. The sucrose-containing solution before concentrating can be any solution obtained prior to molasses formation; e.g. untreated diffusion juice, prelimed and/or predefecated diffusion juice, purified diffusion juice or even a solution formed by reconstituting from raw recovered sugar; alternatively, it can be a solution after molasses formation, in which event the selected acid, if it includes acetic acid, only includes it in a mixture with other aliphatic carboxylic acids. It may also be waste fluid from a canning operation or the like.





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