Sugar – starch – and carbohydrates – Processes – Carbohydrate manufacture and refining
Patent
1997-07-01
1999-08-31
Brunsman, David
Sugar, starch, and carbohydrates
Processes
Carbohydrate manufacture and refining
127 1, 127 9, 127 36, 210661, 210675, 210676, 210679, 422140, 422212, 422213, 422261, B01J 312, C13D 312, B01D 1502
Patent
active
059449055
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method and an apparatus for performing a continuous reaction with at least one liquid phase and at least one solid phase reaction catalyst in a pulsed column, and more particularly a method for placing in continuous and simultaneous contact at least one liquid reaction phase incorporating at least one starting compound with at least two solid phases consisting of at least one solid reaction catalyst and at least one solid selectively adsorbing extraction compound of a starting compound and/or a final product and/or an intermediate product or a by-product of reaction.
BACKGROUND OF THE INVENTION
Liquid phase chemical reactions requiring heterogeneous catalysis can be performed continuously in multi-contact reactors. For example,the patent application WO 92/10486 describes a method for the preparation of 5-hydroxymethyl furfural (HMF) by means of heterogeneous catalysis in liquid/liquid extraction reactors which may be pulsed columns.
The pulsed columns are vertical extraction or separation columns with horizontal plates of the disk and collar and/or collar and basket types and in which at least one solid phase is generally circulated downwards by gravity and at least one liquid phase is circulated in co-flow or in counter-flow. A pulsed column is equipped with a device capable of maintaining pulsations of the liquid phases within the column through an appropriate lining. It is known that the amplitude and the frequency of the pulsations can be regulated as a function of the respective residence times desired for the different phases in the column.
Thus, the document "Pulsed perforated-plate columns", D. H. Logsdail, M. J. Slaten, Handbook of Solvent Extraction, Teh C. Lo, Malcolm H. I. Baird, Carl Hanson, Krieger Publishing Company, Malabar, Fla., 1991, 11-2, p. 335-372, describes the general principles of pulsed columns.
OBJECTS OF THE INVENTION
In this context, the object of the invention is to suggest a method and an apparatus enabling the conversion yield of the reaction and the selectivity of production of at least one final product or intermediate of the reaction to be precisely controlled.
The object of the invention is also to suggest a method and an apparatus which enable a high productivity to be obtained, which are compatible with present environmental requirements (they produce little or no harmful effluents), inexpensive to implement, profitable irrespective of the size of the apparatus and its capacity and which allow a very large variety of starting materials to be used.
More particularly, the subject of the invention is to suggest a method and an apparatus capable of being operated at high temperatures, for short residence times and with high concentrations of starting material(s) in the liquid reaction phase.
Furthermore, the object of the invention is to suggest a method and an apparatus making it possible to perform simultaneously several chemical operations (reaction(s), extraction(s), separation(s), . . . ) in a single circulation step of the liquid reaction phase(s). The object of the invention is additionally to suggest a method and an apparatus by means of which the separation and extraction steps are performed continuously and more conveniently, more rapidly and less expensively than in the prior art.
More particularly, the object of the invention is to suggest a method and an apparatus for the placing in continuous and simultaneous contact of at least one liquid sugar solution with at least two solid phases, namely with at least one heterogeneous solid catalyst and at least one solid selective extraction compound.
Therefore, the object of the invention is also to suggest a method which can be made operational starting from a highly concentrated, non-crystallized sugar solution in an apparatus of small volume and with which one or more high temperature reactions may be continuously performed with a short residence time of the reaction solution in the apparatus.
More particularly, the object of the invention is to suggest a met
REFERENCES:
patent: 4284511 (1981-08-01), Weitzen et al.
patent: 4957627 (1990-09-01), Fortuin et al.
D.H. Logsdail et al., "Pulsed Perforated-Plate Columns", Handbook of Solvent Extraction, pp. 355-372. (1991) No Month Avail.
Faugeras Pierre
Laporte Fran.cedilla.oise
Neau Marie-Claude
Roux Gabriel
Agrichimie
Brunsman David
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