ENERGY SAVING IN THE SOYA BEAN EXTRACTION INDUSTRY BY REDUCING THE STEAM CONSUMPTION FOR DESOLVENTIZING - TOASTING AND DRYING EXTRACTED BEANS

Información del proyecto

Identificador del acuerdo de subvención: EE-B1-138

Fecha de inicio

Fecha de finalización

Financiado con arreglo a

• Energy research and development programme (EEC), 1979-1983

Coste total

Sin datos

Aportación de la UE

Sin datos

Coordinado por

CIVO INSTITUTES TNO
Netherlands

Objetivo

FIVE COMMUNITY COUNTRIES EACH PROCESSED MORE THAN 1 MILLION TONNES OF SOYA BEANS IN 1981, AND THE TOTAL AMOUNT PROCESSED IN THE COMMUNITY WAS OVER 10 MILLION TONNES. THE SOYA BEAN EXTRACTION PROCESS INVOLVES A NUMBER OF STAGES. FOR THE PRODUCTION OF SOYA BEAN OIL AND MEAL, SOYA BEANS ARE CONSECUTIVELY : CRACKED, DEHULLED (IN MAKING SOYA BEAN MEAL OF 49 % PROTEIN), HEAT-CONDITIONED AND FORMED IN FLAKES FROM WHICH OIL IS EXTRACTED BY MEANS OF HEXANE. THE REMAINING MEAL (DEFATTED FLAKES), CONTAINING 30 - 40 % HEXANE, IS SUBSEQUENTLY DESOLVENTIZED AND TOASTED (TO IMPROVE ITS NUTRITIONAL VALUE) BY MEANS OF STEAM. FINALLY THE WET EXTRACTED MEAL IS DRIED BY MEANS OF AIR. IN THE MANUFACTURE OF LOW-PHOSPHORUS SOYA BEAN OIL, THE FLAKES (BEFORE EXTRACTION) ARE COOKED AT A MOISTURE CONTENT OF 16 % AND AT A TEMPERATURE OF ABOUT 110 DEGREES C (TO PARTIALLY DEACTIVATE THE ENZYMES) AND SUBSEQUENTLY DRIED TO ABOUT 11 % MOISTURE CONTENT AND COOLED TO ABOUT 60 DEGREES C. THESE FLAKES ARE EXTRACTED IN THE USUAL WAY AND (AFTER DESOLVENTIZING) STILL HAVE TO BE TOASTED TO IMPROVE THEIR NUTRITIONAL VALUE. STEAM USAGE REQUIRED FOR HEAT-CONDITIONING, EXTRACTION, DESOLVENTIZING-TOASTING, DRYING AND FOR DISTILLING HEXANE OUT OF THE OIL-IN-HEXANE SOLUTION, IS PARTICULARLY HIGH, AND IT IS HERE THAT TNO IS INVESTIGATING ENERGY SAVING TECHNIQUES.

THE AIM OF THE RESEARCH IS TO REDUCE THE STEAM CONSUMPTION AS FOLLOWS :
- BY COMBINING THE TOASTING OPERATION (WHICH CONSUMES 60 KG STEAM PER TONNE OF BEANS) WITH THE HEAT CONDITIONING STEP (WHICH CONSUMES 45 KG STEAM PER TONNE OF BEANS) AND UTILIZING WASTE COMBUSTION GASES FOR THE PRODUCTION OF STEAM, 20 KG STEAM PER TONNE OF BEANS CAN BE SAVED;
- 30 KG STEAM PER TONNE OF BEANS CAN BE SAVED IN THE DRYING OPERATION (WHICH CONSUMES ABOUT 100 KG STEAM PER TONNE OF BEANS), BY DESOLVENTIZING THE DEFATTED FLAKES BY MEANS OF SUPERHEATED HEXANE VAPOUR, RESULTING IN SOYA BEAN MEAL OF LOW WATER CONTENT WHICH HARDLY NEEDS ANY DRYING.

IN THIS CONTEXT THE OPTIMUM SPECIFIC ENERGY CONSUMPTION OF THE PROCESSES CONCERNED HAS BEEN ASSESSED. IT WAS FOUND THAT THE STEAM CONSUMPTION BASED ON 1 TON OF BEANS IN THE MOST IMPORTANT OPERATIONS OF THE NEW PROPOSED PROCESS WILL BE : 118 KG FOR HEAT CONDITIONING AT 110 DEGREES C AND TOASTING, 97 KG FOR DESOLVENTIZING DEFATTED FLAKES (35 % HEXANE) AT 80 DEGREES C AND 6 KG (ESTIMATED) FOR STRIPPING RESIDUAL HEXANE IN THE MEAL. THE TOTAL STEAM CONSUMPTION BASED ON 1 TON OF BEANS IS THUS 221 KG, WHICH IS 106 KG LESS THAN THAT OF TODAY'S PROCESS AND CONSIDERABLY BETTER THAN THE ENVISAGED ENERGY SAVINGS OF 50 KG/TON. FURTHERMORE, THE SOYA BEANS TOASTED IN RELATIVELY DRY CONDITIONS DID NOT LOSE THEIR PROTEIN AND OIL QUALITY. THE PAYBACK PERIOD WAS 3.4 YEARS (ASSUMING A PLANT OF 1000 TON/DAY AND A SAVING OF ONLY 40 KG/TON.

Ámbito científico (EuroSciVoc)

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Programa(s)

• PRE-ENNONUC 2C - Energy research and development programme (EEC), 1979-1983

Tema(s)

Datos no disponibles

Convocatoria de propuestas

Datos no disponibles

Régimen de financiación

Datos no disponibles

Coordinador

CIVO INSTITUTES TNO

• Aportación de la UE: Sin datos
• Dirección: DIVISION FOR NUTRITION AND FOOD RESEARCH P.O. BOX 360 ; 3700 AJ ZEIST ; Países Bajos
• Coste total: Sin datos