A method for preparing phase change wax by sweating

Abstract

The present invention relates to a method for preparing phase change wax by sweating and a sweating dish device with an external circulation heat-insulating water system used in the method, including a method for preparing phase change wax by using a solid oil-containing regulator and a sweating dish device with a high heat-conducting sieve plate. The sweating dish device includes a sweating dish body with a valve provided at the lower outlet and a multi-layer high heat-conducting sieve plate arranged in the sweating dish body; a heat-insulating interlayer is provided in the sweating dish body; a water inlet and a water outlet are provided on the heat-insulating interlayer. Sweating includes the following steps: preliminary work, preparation of the sweating dish device; preparation of the mixed material, loading operation, cooling operation; heating operation; after the heating is completed, the material remaining after sweating in the sweating dish device is taken out for white clay refining, decolorization, and molding to obtain phase change wax. The purpose of the present invention is to overcome the defects of the prior art and provide a method for preparing phase change wax by sweating and a sweating dish device with an external circulation heat-insulating water system used in the method.

Description

Technical Field

[0001] The invention relates to the field of phase change wax, in particular to a method for preparing phase change wax by sweating. Background Art

[0002] Phase-change wax is one of the most promising endothermic and exothermic materials discovered so far. When transitioning from liquid to solid, the wax undergoes a physical change in state. During these two phase transitions, the material absorbs heat from the environment and releases heat to it, generating significant amounts of heat during the solid-liquid transition. The heat stored or released by the wax during this physical transition is called phase-change heat. While the wax's temperature remains virtually unchanged until the phase transition is complete, the latent heat it absorbs or releases is substantial.

[0003] Sweating is an important process for producing phase change wax. It mainly utilizes the fact that the melting point of the oil contained in the wax and the soft wax is lower than that of the hard wax. Under normal pressure, the heat carrier is indirectly contacted with the raw materials, and different temperatures are controlled to separate the oil and wax, thereby obtaining phase change wax with low oil content.

[0004] However, the main disadvantage of the existing paraffin sweating process is that if the sweating raw material has a high oil content, the sweating raw material crystals are small due to the high oil content, resulting in a decrease in sweating efficiency, so the yield of qualified sweating products is low, or when the product yield is high, the product contains a high oil content.

[0005] The previous sweating dish device had uneven temperature of the sweating raw materials during the sweating process, and the sweating effect was not ideal, resulting in high oil content and high content of low-melting-point wax in the sweating product. Therefore, the sweating product was of poor quality and low melting point, which could not meet the quality requirements of high-quality phase change wax. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a method for preparing phase change wax by sweating and a sweating dish device.

[0007] The technical solution for achieving the purpose of the present invention is: a method for preparing phase change wax by sweating, comprising the following steps:

[0008] Preliminary work: preparation of the sweat dish device;

[0009] Mixture preparation: solid raw materials and solid oil-containing regulator are mixed and heated until the physical state changes from solid to liquid to obtain liquid mixed wax;

[0010] Loading operation: adding liquid mixed wax into the sweating dish device;

[0011] Cooling operation, naturally cooling the liquid mixed wax to below the melting point of the liquid mixed wax;

[0012] Heating operation, when the temperature required for cooling operation is reached, drain the water in the sweating dish device and start the circulation at the same time

[0013] The insulation water system circulates so that the temperature of the circulating insulation water system is consistent with the temperature of the mixed wax in the sweating dish device;

[0014] The sweating product is processed. After the heating is completed, the remaining material in the sweating dish device is taken out, and then refined, decolorized and formed with white clay to obtain phase change wax.

[0015] More preferably, the preliminary preparation work is to add water to the bottom of the sweating dish device until the water fills the lower space of the sweating dish device.

[0016] More preferably, the solid raw material in the preparation of the mixture is a solid oil-containing wax paste obtained after wax pressing of crude oil vacuum tower distillate oil, or a solid oil-containing wax paste obtained after solvent deoiling of crude oil vacuum tower distillate oil.

[0017] More preferably, the solid oil-containing regulator in the preparation of the mixture is a sweat product phase change wax or a wax with the same properties as the sweat product phase change wax.

[0018] More preferably, the temperature of the liquid mixed wax in the cooling operation is reduced to 10-15° C. lower than the low melting point wax in the mixed wax.

[0019] A sweating dish device used in the method for preparing phase change wax using a sweating dish, comprising a sweating dish body with a valve provided at the lower outlet and multiple layers of high thermal conductivity sieve plates arranged in the sweating dish body; the multiple layers of high thermal conductivity sieve plates are evenly distributed with sieve holes; the sweating dish body is provided with a thermal insulation interlayer; the thermal insulation interlayer is provided with a water inlet and a water outlet. The sweating dish body of the present invention is provided with multiple layers of high thermal conductivity sieve plates and a thermal insulation interlayer is provided on the upper inner periphery of the sweating dish body. The advantage is that the heat conduction rate of the sweating raw material is increased, the surface temperature of the sweating raw material is made uniform with the internal temperature of the sweating raw material, which is conducive to the outflow of oil and low-melting-point components, improves the sweating efficiency, reduces the oil content of the sweating product, increases the melting point of the sweating product, and improves the quality of the sweating product.

[0020] By adopting the above technical solution, the present invention has the following positive effects: The main disadvantage of the existing paraffin wax sweating process is that if the sweating raw material has a high oil content, the high oil content of the sweating raw material causes the sweating raw material crystals to be small, resulting in reduced sweating efficiency, resulting in a low yield of qualified sweating products, or when the product yield is high, the product oil content is high. The present invention adopts the method of adding qualified products to the raw material with a high oil content, thereby reducing the oil content of the sweating raw material and making the sweating raw material crystals larger, thereby improving sweating efficiency, increasing the sweating raw material yield, and reducing the oil content of the product. The more qualified products are added, the higher the sweating product yield and the lower the oil content of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein

[0022] Figure 1 It is a perspective view of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the internal planar structure of the present invention;

[0024] Figure 3 It is an overall diagram of the present invention;

[0025] Figure 4 Schematic diagram of the high thermal conductivity sieve plate structure of the present invention.

[0026] The reference numerals in the accompanying drawings are: sweating dish body 10 , high thermal conductivity sieve plate 20 , sieve hole 30 , thermal insulation interlayer 40 . DETAILED DESCRIPTION

[0027] The present invention comprises the following steps:

[0028] Preliminary work involves preparing the sweating dish assembly. The sweating dish assembly comprises a sweating dish body 10 with a valve at the bottom outlet and multiple layers of high-thermal-conductivity sieve plates 20 disposed within the sweating dish body 10. These multiple layers of high-thermal-conductivity sieve plates 20 are evenly distributed with sieve holes 30. Preliminary preparation involves adding water to the bottom of the sweating dish body 10 until the water fills the space below the lowest layer of high-thermal-conductivity sieve plates 20. The multiple layers of high-thermal-conductivity sieve plates 20 are mounted with a support device.

[0029] The mixture is prepared by mixing a solid raw material and a solid oil-containing modifier and heating them until their physical state changes from solid to liquid, thereby obtaining a liquid mixed wax. The solid raw material in the mixture is a solid oil-containing wax paste obtained by wax pressing from a crude oil vacuum tower distillate, or a solid oil-containing wax paste obtained by solvent deoiling from a crude oil vacuum tower distillate. The wax paste typically has a melting point of 68°C and an oil content of 9%. The solid oil-containing modifier in the mixture is a sweat-inducing product phase-change wax or a wax with similar properties to a sweat-inducing product phase-change wax.

[0030] The phase-change wax for the sweating product is a low-oil-content finished paraffin wax having a melting point of 76.5°C and an oil content of 0.63%; or a wax having the same properties as the phase-change wax for the sweating product, such as at least one of n-32 alkane, n-33 alkane, n-34 alkane, n-35 alkane, or n-36 alkane;

[0031] Loading operation: adding liquid mixed wax into the sweating dish body 10 through the wax pump;

[0032] The cooling operation is to naturally cool the liquid mixed wax to below the melting point of the liquid mixed wax, and at the same time cool it by passing cooling water into the lower part of the sweating dish body 10; the liquid mixed wax in the cooling operation is cooled to 10-15°C lower than the low melting point wax in the mixed wax.

[0033] In the heating operation, the cooled sweating dish device is placed in a sweating oven and the oven temperature is gradually increased to slowly heat the cooled mixed wax. Specifically, when the required temperature for the cooling operation is reached, the water in the sweating dish body 10 is drained, and then the electric heating oven is started to slowly heat the sweating dish body 10 so that the sweating material in the sweating dish body 10 gradually heats up. The sweating material is the mixed wax. At the same time, the circulating heat preservation water system is started to circulate, so that the circulating heat preservation water system gradually heats up, and its temperature and heating rate are consistent with the temperature and heating rate of the oven.

[0034] In the processing of the sweating product, after the heating is completed, the remaining material in the sweating dish body 10 is taken out, and then refined, decolorized and formed with white clay to obtain the phase change wax.

[0035] See Figures 1 to 4 A sweating dish device used in a method for preparing phase change wax using a sweating dish includes a sweating dish body 10 with a valve provided at the lower outlet and a multi-layer high thermal conductivity sieve plate 20 arranged in the sweating dish body 10; the multi-layer high thermal conductivity sieve plate 20 is evenly distributed with sieve holes 30; a thermal insulation interlayer 40 is provided in the sweating dish body 10; a water inlet and a water outlet are provided on the thermal insulation interlayer 40, and a circulating thermal insulation water system is formed by the thermal insulation interlayer 40, the water inlet and outlet, and the circulating water.

[0036] (Comparative Example)

[0037] Using an existing conventional sweating dish device without a high-thermal-conductivity sieve plate, the following sweating operation is performed: water is added to the bottom of the sweating dish body 10, filling the space below the water sieve plate. 10 kg of raw wax with a melting point of 68°C and a 9% oil content is heated to a liquid state above the melting point, and then the raw material is added to the sweating dish body 10. The liquid mixed wax is naturally cooled to 56°C. When the raw wax reaches 56°C, the water in the sweating dish body 10 is drained, and the oven's electric heating system is then activated to slowly heat the sweating dish body 10, gradually raising the temperature of the raw wax. After heating is completed, the remaining material in the sweating dish body 10 is removed, refined and decolorized with white clay, and then formed to obtain phase change wax. Testing has shown that the phase change wax has a melting point of 75.8°C, an enthalpy of 189 kJ / kg, a phase change wax yield of 26%, and an oil content of 0.86%.

[0038] (Example 1)

[0039] Using this sweating dish device, water is added to the bottom of the sweating dish body 10 until the water fills the space below the sieve plate. 80 kg of raw wax with a melting point of 68°C and a 9% oil content and 20 kg of finished low-oil paraffin wax with a 0.63% oil content at 76.5°C are heated together until they are above their melting point and in a liquid state. The liquid wax mixture is then added to the sweating dish body 10 and allowed to cool naturally to 56°C. Once the wax mixture reaches 56°C, the water in the sweating dish body 10 is drained, and the oven's electric heating system is then activated to slowly heat the sweating dish body 10, gradually raising the temperature of the wax mixture. Simultaneously, the circulating heat-insulating water system in the interlayer of the sweating dish body 10 is activated, gradually raising the temperature of the constant-temperature water system, with its temperature and rate of increase consistent with the oven temperature and rate of increase. After heating is complete, the remaining material in the sweating dish body 10 is removed, refined with clay for decolorization, and then formed to produce phase change wax. After testing, the melting point of the phase change wax is 76.9°C, the enthalpy value is 195KJ / kg, the phase change wax yield is 31%, and the oil content of the product is 0.63%.

[0040] (Example 2)

[0041] Using this sweating dish device, water is added to the bottom of the sweating dish body 10 until the water fills the space below the sieve plate. 90 kg of raw wax with a melting point of 68°C and a 9% oil content and 10 kg of finished low-oil paraffin wax with a 0.63% oil content at 76.5°C are heated together until they are above their melting point and in a liquid state. The liquid wax mixture is then added to the sweating dish body 10 and allowed to cool naturally to 56°C. Once the wax mixture reaches 56°C, the water in the sweating dish body 10 is drained, and the oven's electric heating system is then activated to slowly heat the sweating dish body 10, gradually raising the temperature of the wax mixture. Simultaneously, the circulating, insulated water system in the interlayer of the sweating dish body 10 is activated, gradually raising the temperature of the constant-temperature water system, with its temperature and rate of increase consistent with the oven's temperature and rate of increase. After heating is complete, the remaining material in the sweating dish body 10 is removed, refined with clay for decolorization, and then formed to produce phase change wax. After testing, the melting point of the phase change wax is 76.7°C, the enthalpy value is 193KJ / kg, the phase change wax yield is 29%, and the oil content of the product is 0.69%.

[0042] (Example 3)

[0043] Using this sweating dish device, water is added to the bottom of the sweating dish body 10 until the water fills the space below the sieve plate. 95 kg of raw wax with a melting point of 68°C and a 9% oil content and 5 kg of finished low-oil paraffin wax with a 0.63% oil content at 76.5°C are heated together until they are above their melting point and in a liquid state. The liquid wax mixture is then added to the sweating dish body 10 and allowed to cool naturally to 56°C. Once the wax mixture reaches 56°C, the water in the sweating dish body 10 is drained, and the oven's electric heating system is then activated to slowly heat the sweating dish body 10, gradually raising the temperature of the wax mixture. Simultaneously, the circulating heat-insulating water system in the interlayer of the sweating dish body 10 is activated, gradually raising the temperature of the constant-temperature water system, with its temperature and rate of increase consistent with the oven temperature and rate of increase. After heating is complete, the remaining material in the sweating dish body 10 is removed, then refined with clay for decolorization and formed into a phase change wax. After testing, the melting point of the phase change wax is 76.1°C, the enthalpy value is 191KJ / kg, the phase change wax yield is 27.5%, and the oil content of the product is 0.75%.

[0044] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing phase change wax by sweating, characterized in that: Preliminary work: preparation of the sweat dish device; Mixture preparation: solid raw materials and solid oil-containing regulator are mixed and heated until the physical state changes from solid to liquid to obtain liquid mixed wax; Loading operation: adding liquid mixed wax into the sweating dish device; Cooling operation, naturally cooling the liquid mixed wax to below the melting point of the liquid mixed wax; Heating operation: slowly heating up the cooled mixed wax and starting the circulating insulation water system to make the temperature of the circulating insulation water system consistent with the temperature of the mixed wax in the sweating dish device; After the heating is completed, the remaining material in the sweating dish device is taken out, and then refined with white clay for decolorization and molding to obtain phase change wax; The solid oil-containing conditioning agent in the preparation of the mixture is a sweating product phase change wax.

2. The method for preparing phase change wax by sweating according to claim 1, wherein: The preliminary preparation work is to add water to the bottom of the sweating dish device until the water fills the lower space of the sweating dish device.

3. The method for preparing phase change wax by sweating according to claim 1, wherein: The solid raw material in the preparation of the mixed material is a solid oil-containing wax paste obtained after wax pressing of crude oil vacuum tower distillate oil, or a solid oil-containing wax paste obtained after solvent deoiling of crude oil vacuum tower distillate oil.

4. The method for preparing phase change wax by sweating according to claim 1, wherein: In the cooling operation, the liquid mixed wax is cooled to a temperature 10-15° C. lower than the low melting point wax in the mixed wax.

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