Purification method of industrial wax

Abstract

The invention discloses a purification method of industrial wax, which comprises the following steps: firstly, placing wax chips to be treated in a container, placing the container in a vacuum chamber, heating in a vacuum environment to obtain molten wax liquid, then taking out the surface layer part of the molten wax liquid to obtain first recycled wax liquid, and recycling the first recycled wax liquid to obtain the industrial wax. The method comprises the following steps: adding a first recovered wax liquid into a to-be-purified wax liquid containing the first recovered wax liquid, adding the to-be-purified wax liquid containing the first recovered wax liquid into a dilute sulfuric acid solution to obtain a mixed liquid, standing and layering the mixed liquid, and carrying out liquid separation treatment on the mixed liquid to obtain a wax liquid with a good purity effect, so that the whole process is simple and feasible, the processing time is short, and the method is particularly suitable for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of industrial wax, in particular to a method for purifying industrial wax. Background Art

[0002] At present, in the field of semiconductor manufacturing, wax is often used for bonding. Wax can be reused. The traditional wax processing process has the disadvantages of long time, unclean water and impurity processing, unsatisfactory effect, etc., and even waste will appear in the processing process. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method for purifying industrial wax, comprising:

[0004] Placing the wax chips to be processed in a container, and placing the container in a vacuum chamber;

[0005] The vacuum chamber is evacuated, and the heating temperature is maintained within a preset temperature range for heating treatment to obtain melted wax liquid;

[0006] Taking out the surface portion of the melted wax liquid to obtain a first recovered wax liquid;

[0007] Adding the wax liquid to be purified into a dilute sulfuric acid solution to obtain a mixed solution; wherein the wax liquid to be purified includes the first recovered wax liquid;

[0008] The mixed solution is allowed to stand, and after the mixed solution is layered, the mixed solution is subjected to liquid separation treatment to obtain a purified wax liquid.

[0009] As a preferred solution, the vacuum chamber is evacuated and the heating temperature is maintained within a preset temperature range for heating to obtain melted wax liquid, which specifically includes:

[0010] The vacuum chamber is evacuated to -80 to -70 kPa, and the heating temperature is maintained at 35-45° C. for 25-30 minutes to obtain melted wax liquid.

[0011] As a preferred solution, the step of evacuating the vacuum chamber is specifically to evacuate the vacuum chamber to -75 kPa.

[0012] As a preferred solution, the concentration of the dilute sulfuric acid solution is 1-2 g / L, and the mass of the dilute sulfuric acid solution is 5% of the mass of the wax liquid.

[0013] As a preferred embodiment, the wax liquid to be purified further comprises a second recovered wax liquid; after the vacuum chamber is evacuated and the heating temperature is maintained within a preset temperature range for heating treatment to obtain the melted wax liquid, the process further comprises:

[0014] The bottom layer of the melted wax liquid is removed, and the container is placed in a dewaxing solvent to obtain the second recovered wax liquid.

[0015] As a preferred embodiment, the dewaxing solvent is a mixture solvent of acetone and xylene; then removing the bottom layer of the melted wax liquid and placing the container in the dewaxing solvent to obtain the second recovered wax liquid specifically comprises:

[0016] removing the bottom layer of the melted wax liquid;

[0017] The container is placed in a dewaxing solvent for 45-55 minutes to obtain the second recovered wax liquid.

[0018] As a preferred embodiment, the mass fraction ratio of acetone to xylene in the dewaxing solvent is 1:5, and the temperature in the dewaxing solvent is 35-40°C.

[0019] As a preferred embodiment, the temperature of the dewaxing solvent is 37°C.

[0020] As a preferred embodiment, the mixed solution is allowed to stand, and after the mixed solution is layered, the mixed solution is subjected to a liquid separation process to obtain a purified wax liquid, which specifically comprises:

[0021] Pour the mixed solution into a liquid separation device and let it stand;

[0022] After the mixed liquid is separated into layers, the wax liquid located in the upper layer of the mixed liquid is obtained.

[0023] As a preferred embodiment, the liquid separation device includes a liquid separation chamber, a blocking plate and a positioning tube. The top of the liquid separation chamber is provided with an inlet, the bottom of the liquid separation chamber is provided with a switchable outlet, the positioning tube is arranged in the liquid separation chamber, the blocking plate is arranged opposite to the outlet, the blocking plate is arranged in the positioning tube, and the body of the positioning tube is provided with a plurality of through holes; the density of the blocking plate is greater than the density of the wax liquid and less than the density of the lower layer of liquid after the mixed liquid is layered.

[0024] As a preferred solution, a sealing layer is provided at the bottom of the blocking plate, a sealing gasket is provided on the inner bottom surface of the liquid separation chamber, and the sealing gasket ring is arranged at the edge of the outlet.

[0025] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows: the method for purifying industrial wax provided by the embodiments of the present invention first places the wax fragments to be processed in a container, and places the container in a vacuum chamber, and performs a heating treatment under a vacuum environment to obtain a melted wax liquid, then takes out the surface portion of the melted wax liquid to obtain a first recovered wax liquid, and adds a dilute sulfuric acid solution to the wax liquid to be purified containing the first recovered wax liquid to obtain a mixed liquid, and after the mixed liquid is allowed to stand and separate into layers, the mixed liquid is subjected to a liquid separation treatment to obtain a wax liquid with a good purity effect, and the whole process is simple and easy, with a short processing time, and is particularly suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic flow chart of a method for purifying industrial wax in an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the liquid separation device in the embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0029] See also Figure 1 As shown, it is a schematic flow chart of the method for purifying industrial wax in an embodiment of the present invention.

[0030] The method for purifying industrial wax according to the embodiment of the present invention comprises:

[0031] Step S101, placing wax fragments to be processed in a container, and placing the container in a vacuum chamber;

[0032] Step S102, evacuating the vacuum chamber and performing heating treatment while maintaining the heating temperature within a preset temperature range to obtain melted wax liquid;

[0033] Step S103, taking out the surface portion of the melted wax liquid to obtain a first recovered wax liquid;

[0034] Step S104, adding the wax liquid to be purified into a dilute sulfuric acid solution to obtain a mixed solution; wherein the wax liquid to be purified includes the first recovered wax liquid;

[0035] Step S105, allowing the mixed solution to stand, and after the mixed solution is layered, performing liquid separation treatment on the mixed solution to obtain a purified wax liquid.

[0036] In an embodiment of the present invention, firstly, the wax fragments to be processed are placed in a container, and the container is placed in a vacuum chamber, and a heating treatment is performed in a vacuum environment to obtain a melted wax liquid, then, the surface layer of the melted wax liquid is taken out to obtain a first recovered wax liquid, and the wax liquid to be purified containing the first recovered wax liquid is added to a dilute sulfuric acid solution to obtain a mixed liquid, and after the mixed liquid is allowed to stand and separate, the mixed liquid is subjected to a liquid separation treatment to obtain a wax liquid with a good purity effect. The whole process is simple and easy, and the processing time is short, which is particularly suitable for industrial production.

[0037] The wax in this embodiment refers to polyethylene wax, for example, Wax325mp, with a molecular weight of 2800, a melting point of 106°C, a melting point of 75-80°C, and an acid value of 1.0.

[0038] In the step S101 of "placing the wax fragments to be processed in a container, and placing the container in a vacuum chamber", the collected wax fragments are placed in a sealed vacuum chamber.

[0039] In an optional embodiment, the step S102 of "evacuating the vacuum chamber and maintaining the heating temperature within a preset temperature range to perform heating treatment to obtain melted wax liquid" specifically includes:

[0040] The vacuum chamber is evacuated to -80 to -70 kPa, and the heating temperature is maintained at 35-45°C for heating treatment for 25-30 minutes to obtain melted wax liquid. The heating temperature can be, for example, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, etc. Of course, the heating temperature can also be set to other values ​​according to actual use requirements; the time can be, for example, 25 minutes, 26 minutes, 27 minutes, 28 minutes, 29 minutes, 30 minutes, etc. Of course, the time can also be set to other values ​​according to actual use requirements, which will not be further elaborated here. Preferably, the vacuum chamber is evacuated to -75 kPa.

[0041] In this embodiment, the temperature in the vacuum chamber is adjusted to maintain at 35-45°C, and the vacuum degree is -75kpa. Due to the low air pressure, the wax can melt in this state (and the melting point of wax at normal pressure is usually 75-80°C), and the time is 25-30 minutes, so that the water in the wax can be evaporated. At the same time, because the time is short, the wax will not oxidize and deteriorate, and saponification will not occur. After cooling, the pure wax on the surface is taken out, and the wax on the bottom contains too many precipitated impurities, so it is discarded.

[0042] In an optional embodiment, the concentration of the dilute sulfuric acid solution is 1-2 g / L, and the mass of the dilute sulfuric acid solution is 5% of the mass of the wax liquid. In this embodiment, the concentration of the dilute sulfuric acid solution is set to 1-2 g / L, and the mass of the dilute sulfuric acid solution is 5% of the mass of the wax liquid, and the recovered wax liquid is added to the dilute sulfuric acid for mixing, so as to obtain a wax liquid with high purity.

[0043] In an optional embodiment, the wax liquid to be purified further includes a second recovered wax liquid; after the vacuum chamber is evacuated and the heating temperature is maintained within a preset temperature range for heating treatment to obtain the melted wax liquid, the method further includes:

[0044] The bottom layer of the melted wax liquid is removed, and the container is placed in a dewaxing solvent to obtain the second recovered wax liquid.

[0045] In a specific implementation, some wax still remains on the container, so the wax can be recycled.

[0046] In an optional embodiment, the dewaxing solvent is a mixture solvent of acetone and xylene; removing the bottom layer of the melted wax liquid and placing the container in the dewaxing solvent to obtain the second recovered wax liquid specifically includes:

[0047] removing the bottom layer of the melted wax liquid;

[0048] The container is placed in a dewaxing solvent for a reaction time of 45-55 minutes to obtain the second recovered wax liquid. The reaction time can be, for example, 45 minutes, 46 minutes, 47 minutes, 48 ​​minutes, 49 minutes, 50 minutes, 51 minutes, 52 minutes, 53 minutes, 54 minutes, 55 minutes, etc. Of course, the reaction time can also be set to other values ​​according to actual use requirements, which will not be described in detail here.

[0049] In an optional embodiment, the mass fraction ratio of acetone to xylene in the dewaxing solvent is 1:5, and the temperature of placing the container in the dewaxing solvent is 35-40°C, for example, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C, etc. Of course, the temperature in the dewaxing solvent can also be set to other values ​​according to actual use requirements, which will not be described in detail here. Preferably, the temperature of placing the container in the dewaxing solvent is 37°C.

[0050] In this embodiment, the mass fraction ratio of acetone to xylene in the dewaxing solvent is set to 1:5, and the temperature of the dewaxing solvent is set to 35-40° C. to dissolve the wax and thus facilitate recovery of the wax liquid.

[0051] In an optional embodiment, the mixed solution is allowed to stand, and after the mixed solution is layered, the mixed solution is subjected to a liquid separation process to obtain a purified wax liquid, specifically comprising:

[0052] Pour the mixed solution into a liquid separation device and let it stand;

[0053] After the mixed liquid is separated into layers, the wax liquid located in the upper layer of the mixed liquid is obtained.

[0054] In the specific implementation, the recovered wax liquid is slowly added to a dilute sulfuric acid solution with a concentration of 1-2g / L, the mass of the dilute sulfuric acid solution is 5% of the mass of the wax liquid, and then the mixed liquid is poured into a liquid separation device for standing. After the wax liquid is separated into layers, water and impurities are at the bottom layer and the wax liquid is at the upper layer. After liquid separation, a wax liquid with a purity of 95% can be obtained, which can be used to cast into blocks for repeated use to obtain clean pure wax.

[0055] See also Figure 2 , which is a schematic diagram of the structure of the liquid separation device in the embodiment of the present invention. In an optional embodiment, the liquid separation device includes a liquid separation chamber 1, a plugging plate 2 and a positioning tube 3, the top of the liquid separation chamber 1 is provided with an inlet 4, the bottom of the liquid separation chamber 1 is provided with a switchable outlet 5, the positioning tube 3 is arranged in the liquid separation chamber, the plugging plate 2 is arranged in the positioning tube 3, the plugging plate 2 is arranged opposite to the outlet 5, and the body of the positioning tube 3 is provided with a plurality of through holes; the density of the plugging plate 2 is greater than the density of the wax liquid and less than the density of the lower layer of liquid after the mixed liquid is layered.

[0056] In the conventional technology, liquid separation is generally performed manually, for example, a mixed liquid is poured into a liquid separation device, and after the mixed liquid is allowed to stand for stratification, the outlet of the liquid separation device is manually opened to separate the lower layer of liquid, and then the outlet of the liquid separation device is closed after the lower layer of liquid is visually observed to have been poured out, thereby completing the liquid separation. However, this manual liquid separation method results in low liquid separation accuracy and low efficiency. In the embodiment of the present invention, the mixed liquid can be poured into the inlet 4 of the liquid separation chamber 1, and the outlet 5 is closed at this time; after the mixed liquid is stratified, since the density of the blocking plate 2 is greater than the density of the wax liquid and less than the density of the lower layer of liquid after the mixed liquid is stratified, the blocking plate 2 will be located at the junction of the lower layer of liquid and the upper layer of liquid (wax liquid), and the outlet 5 can be opened at this time to allow the lower layer of liquid to flow out. When the lower layer of liquid flows out completely, the blocking plate 2 drops to the outlet 5 as the liquid level drops, thereby automatically blocking the outlet 5. At this time, the liquid in the liquid separation chamber 1 is wax liquid, and the desired high-purity wax liquid is obtained, thereby avoiding the problem of low liquid separation accuracy and low efficiency caused by traditional manual liquid separation. It should be noted that the switch structure of the outlet 5 can be, for example, a switch valve or other structures, which only needs to be able to open and close the outlet 5, and no further details are given here.

[0057] In an optional embodiment, a sealing layer 6 is provided at the bottom of the blocking plate 2, and a sealing gasket 7 is provided on the inner bottom surface of the liquid separation chamber 1. The sealing gasket 7 is arranged around the edge of the outlet 5. In this way, when the blocking plate 2 blocks the outlet 5, the sealing layer 6 and the sealing gasket 7 are in contact, thereby playing a sealing role to prevent the wax liquid from flowing out of the outlet 5.

[0058] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows: the method for purifying industrial wax provided by the embodiments of the present invention first places the wax fragments to be processed in a container, and places the container in a vacuum chamber, and performs a heating treatment under a vacuum environment to obtain a melted wax liquid, then takes out the surface portion of the melted wax liquid to obtain a first recovered wax liquid, and adds a dilute sulfuric acid solution to the wax liquid to be purified containing the first recovered wax liquid to obtain a mixed liquid, and after the mixed liquid is allowed to stand and separate into layers, the mixed liquid is subjected to a liquid separation treatment to obtain a wax liquid with a good purity effect, and the whole process is simple and easy, with a short processing time, and is particularly suitable for industrial production.

[0059] 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 substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for purifying industrial wax, characterized in that: include: Placing the wax chips to be processed in a container, and placing the container in a vacuum chamber; The vacuum chamber is evacuated, and the heating temperature is maintained within a preset temperature range for heating treatment to obtain melted wax liquid; Taking out the surface portion of the melted wax liquid to obtain a first recovered wax liquid; Adding the wax liquid to be purified into a dilute sulfuric acid solution to obtain a mixed solution; wherein the wax liquid to be purified includes the first recovered wax liquid; The mixed solution is allowed to stand, and after the mixed solution is layered, the mixed solution is subjected to liquid separation treatment to obtain a purified wax liquid.

2. The method for purifying industrial wax according to claim 1, wherein: The step of evacuating the vacuum chamber and maintaining the heating temperature within a preset temperature range to perform heating treatment to obtain melted wax liquid specifically includes: The vacuum chamber is evacuated to -80 to -70 kPa, and the heating temperature is maintained at 35-45° C. for 25-30 minutes to obtain melted wax liquid.

3. The method for purifying industrial wax according to claim 2, characterized in that: The step of evacuating the vacuum chamber specifically involves evacuating the vacuum chamber to -75 kPa.

4. The method for purifying industrial wax according to claim 1, wherein: The concentration of the dilute sulfuric acid solution is 1-2 g / L, and the mass of the dilute sulfuric acid solution is 5% of the mass of the wax liquid.

5. The method for purifying industrial wax according to claim 1, characterized in that: The wax liquid to be purified also includes a second recovered wax liquid; after the vacuum chamber is evacuated and the heating temperature is maintained within a preset temperature range for heating treatment to obtain the melted wax liquid, the method further includes: The bottom layer of the melted wax liquid is removed, and the container is placed in a dewaxing solvent to obtain the second recovered wax liquid.

6. The method for purifying industrial wax according to claim 5, characterized in that: The dewaxing solvent is a mixture solvent of acetone and xylene; removing the bottom layer of the melted wax liquid and placing the container in the dewaxing solvent to obtain the second recovered wax liquid specifically comprises: removing the bottom layer of the melted wax liquid; The container is placed in a dewaxing solvent for 45-55 minutes to obtain the second recovered wax liquid.

7. The method for purifying industrial wax according to claim 6, characterized in that: The mass fraction ratio of acetone to xylene in the dewaxing solvent is 1:5, and the temperature in the dewaxing solvent is 35-40°C.

8. The method for purifying industrial wax according to any one of claims 1 to 7, characterized in that: The step of standing the mixed solution and, after the mixed solution is layered, performing a liquid separation process on the mixed solution to obtain a purified wax liquid specifically comprises: Pour the mixed solution into a liquid separation device and let it stand; After the mixed liquid is separated into layers, the wax liquid located in the upper layer of the mixed liquid is obtained.

9. The method for purifying industrial wax according to claim 8, characterized in that: The liquid separation device includes a liquid separation chamber, a blocking plate and a positioning tube. The top of the liquid separation chamber is provided with an inlet, the bottom of the liquid separation chamber is provided with a switchable outlet, the positioning tube is arranged in the liquid separation chamber, the blocking plate is arranged in the positioning tube, the blocking plate is arranged opposite to the outlet, and a plurality of through holes are arranged on the body of the positioning tube; the density of the blocking plate is greater than the density of the wax liquid and less than the density of the lower layer of liquid after the mixed liquid is layered.

10. The method for purifying industrial wax according to claim 9, characterized in that: A sealing layer is provided at the bottom of the blocking plate, a sealing gasket is provided on the inner bottom surface of the liquid separation chamber, and the sealing gasket ring is arranged at the edge of the outlet.

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