# US 5,344,564 A · Method for removing extraction solvent from extraction residue trapped in an oil-and-fat extractor

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- Number: US 5,344,564 A
- Document ID: US5344564A
- Status: Granted
- Kind: A
- Application number: 08/083,440
- Filed: 1993-06-29
- Granted: 1994-09-06
- Earliest claimed: 1992-06-29
- Assignees: Ajinomoto Co., Inc.; Toyo Oil Mills Co., Inc.
- Inventors: Yuzuru Ohtsuka; Kiyoji Suzuki; Toru Nakamura
- Web page: https://patentgrep.com/patent/US5344564A

## CPC

- B01D 11/0292: {Treatment of the solvent}
- A23L 5/23: {by extraction with solvents}
- A23L 11/32: {by extraction with solvents}
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- A23L: FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF (preservation thereof A23B)

## Abstract

A method for removing an organic extraction solvent from an extraction residue, which is characterized in that an oil or fat is allowed to contact an extraction residue remaining in an oil-and-fat extractor which contains an organic solvent, and the oil or fat is then drawn out of said extractor. The procedures of allowing oil or fat to contact said residue and of drawing the oil or fat out of said extractor are repeated until the density of the solvent in the atmosphere of said extractor becomes lower than the lowest ignitable limit.

## Claims

### Claim 1

In a process for removing an organic extraction solvent from an extraction residue contained in an oil-and-fat extractor, the improvement comprising: contacting said extraction residue with an oil or fat so that said solvent is removed from the extraction residue, and solvent contained in the atmosphere of said extractor is reduced to a level below the minimum ignitable limit.

### Claim 2 (depends on 1)

The process of claim 1 wherein the volume of oil or fat is 1 to 5 times the volume of the extraction residue.

### Claim 3 (depends on 1)

The process of claim 1 wherein the volume of oil or fat is 3 to 4 times the volume of the extraction residue.

### Claim 4 (depends on 1)

The process of claim 1 wherein the solvent is hexane.

### Claim 5 (depends on 1)

The process of claim 1 wherein the oil or fat is the same as that contained in the extraction residue.

### Claim 6 (depends on 1)

The process of claim 1 wherein the extraction residue is contacted with soybean oil, rapeseed oil, corn oil, cotton seed oil or palm oil.

### Claim 7 (depends on 1)

The process of claim 1 wherein the extraction residue is contacted with oil or fat repeatedly.