Sugar – starch – and carbohydrates – Apparatus – Treating amylaceous material
Patent
1998-05-07
1999-10-26
Brunsman, David
Sugar, starch, and carbohydrates
Apparatus
Treating amylaceous material
127 24, 127 68, 530370, C08B 3004
Patent
active
059721197
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for obtaining starch and proteins from the flour of legumes, in particular peas, and to an arrangement for carrying out the process.
The starch of legumes (leguminous plants), in particular of peas, more particularly of wrinkled peas, contains a substantial amount of amylose. Due to the high amylose contents, the starch obtained from the peas has thermoplastic properties and can therefore be processed into form pieces using conventional plastic manufacturing processes. Peas with a higher contents of amylose also have a higher proportion of valuable proteins. A process for obtaining starch and proteins from the flour of legumes is known from the article by Gabriel-Blanke et al., "Production of starch from peas at an industrial scale", published by the Federal Secretary for Food, Agriculture and Forestry, Series A, No. 380, pages 239 to 247, 1990, and from DE 43 01 586 C2. In this conventional process, the legume flour is pulped with an aqueous decomposing agent and continuously fed to a first section of a process line including a plurality of solids-liquids separation stages for extracting the proteins. Subsequently, the solids phase exiting the last solids-liquids separation stage of the first section is suspended in water and continuously fed to a second section of the process line which includes at least one solids-liquids separation stage for separating fibers from starch, and at least one solids-liquids separation stage for separating the starch from the liquid phase. The pea flour is here decomposed with a fivefold quantity of a relatively highly concentrated soda lye and separated in a decanter. The solids phase of the decanter is subsequently suspended again in the fivefold quantity of the highly concentrated soda lye and then again fed to a decanter. The solids phase of the second decanter is suspended in water and the suspension is fed to a screen and to a fine jet screen to separate the fibers.
The liquid phase of the first and the second decanter which contain the proteins, can be combined to obtain the protein. However, the protein in the relatively strong concentrated lye is highly diluted. It is therefore very expensive to obtain the proteins with the conventional processes. The conventional processes also require a relatively large amount of lye and water which increases disposal costs.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a cost-effective process and system with a high yield for obtaining starch of high purity as well as proteins from legumes, in particular from peas.
The object is solved in accordance with the present invention by forming the aqueous decomposing agent from an alkaline concentrate and the liquid phase which is separated by the starch in the second section of the process line, whereby the alkaline concentrate and the liquid phase which is separated by the starch in the second section of the process line, is fed to the first section of the process line between the first and the last solids-liquids separation stage, wherein the liquid phase which is separated in the respective following solids-liquids separation stage of the first section, is fed back in counterflow direction for suspending the solids phase which is fed to the preceding solids-liquids separation stage, and wherein the liquid phase which is separated in the first solids-liquids separation stage of the first section is drawn off the process line for separating the proteins. An arrangement for obtaining starch and proteins from the flour of legumes includes a device for pulping the legume flour with an aqueous decomposing agent, a process line comprising a first section with a plurality of solids-liquids separation stages for extracting the proteins, a container for suspending the solids phase of the last solids-liquids separation stage of the first section in water, a second section of the process line with at least one solids-liquids separation stage for separating the fibers from the starch and at least one soli
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Brunsman David
Feiereisen Henry M.
Flottweg GmbH
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