Method for preparing citral from litsea cubeba

Abstract

The invention discloses a method for preparing citral from litsea cubeba. The method comprises steps as follows: (1) litsea cubeba is taken and pressed, and juice A is obtained; (2) the juice A is centrifuged and separated and an oil layer B is obtained; (3) the oil layer B is extracted with petroleum ether, and a petroleum ether layer C is collected; (4) the petroleum ether layer C is condensed under reduced pressure until no petroleum ether exists, and citral is obtained. The provided preparation method has the characteristics that process equipment is simple, the preparation conditions aremild, the production cost is low, short time is consumed and the like, energy consumption is reduced to the greatest extent, loss such as grease oxidation and the like is avoided, and the method is suitable for industrial production of citral from litsea cubeba.

Description

technical field

[0001] The invention relates to plant essential oil refining technology, in particular to a method for preparing citral from litsea cubeba seeds. Background technique

[0002] Litsea cubeba seed tree, also known as Litsea cubeba and Litsea japonica, belongs to Lauraceae and is a plant of the genus Litsea cubeba. It is widely distributed in the vast hills and mountains to the south of the Yangtze River, and is extremely rich in resources. The real name of the seeds is Litsea Cubese, and the kernels are squeezed, leached or distilled to obtain Litsea Cubese Kernel Oil. The rational use of oil is less.

[0003] For a long time, Litsea cubeba mainly extracts essential oil from its epidermis, and the oil yield is 3% to 4%. The main component is citral, and the content is generally 60% to 80%. Litsea cubeba seed oil is a plant essential oil with a large export volume in my country. It has a wide range of uses. It is one of the important natural fragrances in the ...

Examples

Embodiment 1

[0028] Example 1: Take 100 g of Litsea cubeba seeds treated in 2.1, use a mechanical squeezer to squeeze juice A, the squeezer working pressure is 20MPa, juice A is centrifuged by a high-speed centrifuge at a speed of 10000r / min, and oil layer B is obtained by separation. The oil layer B was extracted twice with 2 times the volume of petroleum ether, the petroleum ether layer C was collected, and the petroleum ether layer C was concentrated under reduced pressure at 40°C until there was no petroleum ether smell to obtain citral.

Embodiment 2

[0029] Embodiment 2: Take 100 g of Litsea cubeba seeds treated in 2.1, use a mechanical squeezer to squeeze juice A, and the working pressure of the squeezer is 30MPa, and the juice A is centrifuged by a high-speed centrifuge at a speed of 10000r / min, and the oil layer B is obtained by separation. The oil layer B was extracted twice with 2 times the volume of petroleum ether, the petroleum ether layer C was collected, and the petroleum ether layer C was concentrated under reduced pressure at 40°C until there was no petroleum ether smell to obtain citral.

Embodiment 3

[0030] Example 3: Take 100 g of Litsea cubeba seeds treated in 2.1, use a mechanical press to press to obtain juice A, and the working pressure of the press is 20MPa, and the juice A is centrifuged by a high-speed centrifuge at a speed of 20000r / min, and the oil layer B is obtained by separation. The oil layer B was extracted twice with 2 times the volume of petroleum ether, the petroleum ether layer C was collected, and the petroleum ether layer C was concentrated under reduced pressure at 40°C until there was no petroleum ether smell to obtain citral.

technical field

[0001] The invention relates to plant essential oil refining technology, in particular to a method for preparing citral from litsea cubeba seeds. Background technique

[0002] Litsea cubeba seed tree, also known as Litsea cubeba and Litsea japonica, belongs to Lauraceae and is a plant of the genus Litsea cubeba. It is widely distributed in the vast hills and mountains to the south of the Yangtze River, and is extremely rich in resources. The real name of the seeds is Litsea Cubese, and the kernels are squeezed, leached or distilled to obtain Litsea Cubese Kernel Oil. The rational use of oil is less.

[0003] For a long time, Litsea cubeba mainly extracts essential oil from its epidermis, and the oil yield is 3% to 4%. The main component is citral, and the content is generally 60% to 80%. Litsea cubeba seed oil is a plant essential oil with a large export volume in my country. It has a wide range of uses. It is one of the important natural fragrances in the ...

Examples

Embodiment 1

[0028] Example 1: Take 100 g of Litsea cubeba seeds treated in 2.1, use a mechanical squeezer to squeeze juice A, the squeezer working pressure is 20MPa, juice A is centrifuged by a high-speed centrifuge at a speed of 10000r / min, and oil layer B is obtained by separation. The oil layer B was extracted twice with 2 times the volume of petroleum ether, the petroleum ether layer C was collected, and the petroleum ether layer C was concentrated under reduced pressure at 40°C until there was no petroleum ether smell to obtain citral.

Embodiment 2

[0029] Embodiment 2: Take 100 g of Litsea cubeba seeds treated in 2.1, use a mechanical squeezer to squeeze juice A, and the working pressure of the squeezer is 30MPa, and the juice A is centrifuged by a high-speed centrifuge at a speed of 10000r / min, and the oil layer B is obtained by separation. The oil layer B was extracted twice with 2 times the volume of petroleum ether, the petroleum ether layer C was collected, and the petroleum ether layer C was concentrated under reduced pressure at 40°C until there was no petroleum ether smell to obtain citral.

Embodiment 3

[0030] Example 3: Take 100 g of Litsea cubeba seeds treated in 2.1, use a mechanical press to press to obtain juice A, and the working pressure of the press is 20MPa, and the juice A is centrifuged by a high-speed centrifuge at a speed of 20000r / min, and the oil layer B is obtained by separation. The oil layer B was extracted twice with 2 times the volume of petroleum ether, the petroleum ether layer C was collected, and the petroleum ether layer C was concentrated under reduced pressure at 40°C until there was no petroleum ether smell to obtain citral.