A method for determining the termination of heating during dry distillation of spices

Abstract

The present invention belongs to the field of spice extraction, and specifically relates to a method for determining the termination of heating during the preparation of spices by dry distillation, comprising the following steps: mixing the fragrance raw materials with a solvent and then heating and dry distilling, wherein the solvent is glycerol and / or propylene glycol; detecting the relative dielectric constant of the heated material during the heating and dry distillation process, and stopping the heating when the detected value of the relative dielectric constant reaches a set value. The present invention monitors the relative dielectric constant of the material during the heating and dry distillation process, and if it tends to a set value, it can be determined as the optimal termination point of the dry distillation preparation work. The method provided by the present invention can better avoid excessive heating of the fragrance raw materials and ensure the aroma quality of the dry distillation spices.

Description

Technical Field

[0001] The invention belongs to the field of spice extraction, and in particular relates to a method for determining heating termination when preparing spices by dry distillation. Background Art

[0002] When preparing spices by dry distillation, the temperature is usually monitored to determine the degree of distillation of the material. This method makes it difficult to accurately determine the end point of heating, which can lead to excessive heating of the material and carbonization, giving the product an unpleasant odor. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a method for determining the termination of heating during the preparation of spices by dry distillation. The method provided by the present invention uses relative dielectric constant as the basis for determining the termination of heating during the preparation of spices by dry distillation, which can better avoid excessive heating of materials and ensure the aroma quality of the dry distillation spices.

[0004] The present invention provides a method for determining the termination of heating during dry distillation of spices, comprising the following steps:

[0005] The aroma raw materials are mixed with a solvent and then heated for dry distillation, wherein the solvent is glycerol and / or propylene glycol; during the heating and dry distillation process, the relative dielectric constant of the heated material is detected, and the heating is stopped when the detected value of the relative dielectric constant reaches a set value.

[0006] Preferably, the aroma-making raw material is tobacco or tangerine peel.

[0007] Preferably, the tobacco is tobacco powder.

[0008] Preferably, the particle size of the tobacco powder is 50-100 meshes.

[0009] Preferably, the solvent is a mixture of glycerol and propylene glycol.

[0010] Preferably, the mass ratio of glycerol to propylene glycol is (2-6):1.

[0011] Preferably, the amount of the solvent used is 10 to 100% of the mass of the fragrance-making raw material.

[0012] Preferably, the temperature of the heating carbonization is 200-250°C.

[0013] Preferably, the detection frequency of the relative dielectric constant is 1 KHz.

[0014] Preferably, the set value is 1.5-2.

[0015] Compared with the prior art, the present invention provides a method for determining the termination of heating during the preparation of spices by dry distillation. The method comprises the following steps: mixing the fragrance raw material with a solvent and then heating and dry distilling, wherein the solvent is glycerol and / or propylene glycol; detecting the relative dielectric constant of the heated material during the heating and dry distillation process, and stopping the heating when the detection value of the relative dielectric constant reaches a set value. Since the component that accounts for a large proportion of the fragrance raw material is plant fiber, the relative dielectric constant of the plant fiber at a test frequency of 1KHz is about 1, while the relative dielectric constant of the moisture in the raw material and the solvent for dry distillation (such as glycerol, propylene glycol, etc.) is much greater than 1. Therefore, if the relative dielectric constant of a certain distillation material tends to 1, then theoretically the moisture in the material and the aroma components that are easily soluble in the solvent are completely released, and the dry distillation of the material should be terminated. Therefore, the present invention monitors the relative dielectric constant of the material during the heating and dry distillation process, and if it tends to a set value, it can be judged as the optimal termination point of the dry distillation preparation work. The method provided by the present invention can better avoid excessive heating of the fragrance raw material and ensure the aroma quality of the dry distillation spices. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention provides a method for determining the termination of heating during dry distillation of spices, comprising the following steps:

[0018] The aroma raw materials are mixed with a solvent and then heated for dry distillation. During the heating and dry distillation process, the relative dielectric constant of the heated material is detected. When the detected value of the relative dielectric constant reaches a set value, the heating is stopped.

[0019] In the determination method provided by the present invention, the aroma-making raw materials include but are not limited to tobacco or tangerine peel; the tobacco is preferably tobacco powder; the particle size of the tobacco powder is preferably 50-100 mesh, specifically 50 mesh, 55 mesh, 60 mesh, 65 mesh, 70 mesh, 75 mesh, 80 mesh, 85 mesh, 90 mesh, 95 mesh or 100 mesh.

[0020] In the determination method provided by the present invention, the solvent is glycerol and / or propylene glycol, preferably a mixture of glycerol and propylene glycol; the mass ratio of glycerol to propylene glycol is preferably (2-6):1, specifically 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1 or 6:1.

[0021] In the determination method provided by the present invention, the amount of the solvent is preferably 10-100% of the mass of the fragrance raw material, specifically 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100%.

[0022] In the determination method provided by the present invention, the temperature of the heating distillation is preferably 200-250°C, specifically 200°C, 205°C, 210°C, 215°C, 220°C, 225°C, 230°C, 235°C, 240°C, 245°C or 250°C.

[0023] In the determination method provided by the present invention, the detection frequency of the relative dielectric constant is preferably 1 KHz; the set value is preferably 1.5-2, specifically 1.5, 1.6, 1.7, 1.8, 1.9 or 2.

[0024] The method provided by the present invention monitors the relative dielectric constant of the material during the heating and dry distillation process, and if it tends to a set value, it can be determined as the optimal dry distillation preparation work termination point. The method provided by the present invention can better avoid excessive heating of the fragrance raw materials and ensure the aroma quality of the dry distillation fragrance.

[0025] For the purpose of greater clarity, the invention is described in detail through the following examples.

[0026] Example 1

[0027] 1 kg of 70-mesh smoke powder and 0.5 kg of propylene glycol were placed in a dry distillation device connected to a relative dielectric constant detector. The heating temperature was 220°C and the materials were stirred to ensure uniform heating. The relative dielectric constant of the materials was detected in real time during the heating process. When the relative dielectric constant measured at a test frequency of 1 KHz reached 2, the heating was stopped and the condensed volatiles were removed.

[0028] The condensed volatiles obtained in this example are tobacco essential oils, which are added to a low-temperature cigarette leaf group at an addition amount of 5% of the tobacco leaf mass to prepare a finished product for evaluation; the results show that the low-temperature cigarette smoke has a prominent original aroma and rich baking aroma.

[0029] Example 2

[0030] 1 kg of tangerine peel raw material, plus 0.5 kg of a mixture of propylene glycol and glycerol (the mass ratio of propylene glycol to glycerol is 1:4), are placed in a dry distillation device connected to a relative dielectric constant detector, the heating temperature is 200°C, and the material is stirred to ensure that the material is heated evenly; during the heating process, the relative dielectric constant of the material is detected in real time, and when the relative dielectric constant measured at a test frequency of 1 KHz reaches 1.8, the heating is stopped and the condensed volatiles are taken out.

[0031] The condensed volatiles obtained in this example are peel essential oils, which are added to a low-temperature cigarette leaf group at an addition amount of 5% of the tobacco leaf mass to prepare a finished product for evaluation; the results show that the low-temperature cigarette smoke has a prominent original aroma, rich tangerine peel aroma, and significantly improved aroma quality.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining the termination of heating during the preparation of spices by dry distillation, characterized in that: The following steps are involved: The aroma raw materials are mixed with a solvent and then heated for dry distillation, wherein the solvent is glycerol and / or propylene glycol; during the heating and dry distillation process, the relative dielectric constant of the heated material is detected, and the heating is stopped when the detected value of the relative dielectric constant reaches a set value.

2. The determination method according to claim 1, characterized in that: The incense making raw material is tobacco or tangerine peel.

3. The determination method according to claim 2, characterized in that: The tobacco is tobacco powder.

4. The determination method according to claim 3, characterized in that: The particle size of the tobacco powder is 50 to 100 meshes.

5. The determination method according to claim 1, characterized in that: The solvent is a mixture of glycerol and propylene glycol.

6. The determination method according to claim 5, characterized in that: The mass ratio of the glycerol to propylene glycol is (2-6):

1.

7. The determination method according to claim 1, characterized in that: The amount of the solvent used is 10-100% of the mass of the fragrance making raw material.

8. The determination method according to claim 1, characterized in that: The temperature of the heating dry distillation is 200-250°C.

9. The determination method according to claim 1, characterized in that: The detection frequency of the relative dielectric constant is 1 KHz.

10. The determination method according to claim 9, characterized in that: The set value is 1.5-2.