Title: Method for preparing edible oil

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Claims: What is claimed is:

1. A process of extracting oil from vegetable seeds comprising the steps of

mechanically expelling crude oil from the vegetable seeds to produce vegetable seed cakes and mechanically expelled crude oil,

separating the mechanically expelled crude oil from the cakes,

passing the separated mechanically expelled crude oil through a layer of the separated cakes produced in the expelling step to filter sediment from the mechanically expelled crude oil, and

chemically extracting crude oil from the cakes after said passing step is performed by flowing a solvent through the layer of cakes.

2. A process as claimed in claim 1 in which said layer of cakes is moved on a conveyor during said passing and chemical extraction steps with the passing step being performed at a point along the conveyor upstream of where the chemical extracting step is performed.

3. A process as claimed in claim 2 wherein the chemical extraction step includes a plurality of repetitive flowing steps wherein the solvent is flowed through respective successive sections of the layer of cakes beginning adjacent the downstream end of the conveyor, and the passing step occurs simultaneously with one of the flowing solvent steps adjacent the upstream end of the conveyor.

4. A process as claimed in claim 3 including the step of collecting the mechanically expelled crude oil oil in a service tank prior to combining the separated mechanically expelled crude oil with the cakes to prevent a backflow of solvent into the crude oil.

5. A process as claimed in claim 4 including the step of filtering large size sediment from the separated mechanically expelled crude oil prior to the collecting step for the mechanically expelled crude oil.

6. A process as claimed in claim 1 wherein the seed is selected from the group consisting of cotton seed, rapeseed, safflower seed, sunflower seed and linseed.

Other info:

Inventors: Okumori, Toshio (Sagamihara, JA)
Tadokoro, Yozo (Yokohama, JA)
Takagi, Yoshiyuki (Yokohama, JA)
Yoshida, Nobuo (Yokohama, JA)

Application Number: 674121
Filing Date: 1976-04-06
Publication_date: 1977-02-22
Assignee: Nisshin Seiyu Kabushiki Kaisha (Tokyo, JA)
Primary Class(es): 426/489 554/9
Other Classes:
US Patent Ref:

2253696	Aug, 1941	Fauth	260/412.
2505139	Apr, 1950	Pascal	260/412.
2714551	Aug, 1955	Pascal	260/412.
2934431	Apr, 1960	Cavanagh	426/417.

Other Refs: 214,478705,369

Apr, 1924	UK
Mar, 1954	UK

Primary Examiner: Bashore, S. Leon
Assistant Examiner: Caroff, Marc L.
Attorney: O'Brien & Marks