CN105754657B - A kind of preparation method of low melt point paraffin - Google Patents
A kind of preparation method of low melt point paraffin Download PDFInfo
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- CN105754657B CN105754657B CN201410786086.5A CN201410786086A CN105754657B CN 105754657 B CN105754657 B CN 105754657B CN 201410786086 A CN201410786086 A CN 201410786086A CN 105754657 B CN105754657 B CN 105754657B
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Abstract
The invention discloses a kind of preparation method of low melt point paraffin.This method is uniformly paved with solid particle before the sweating effort that heats up on wax layer surface, and forces air flow through wax layer in the sweating effort that heats up, and carries out the oil in liquid, accelerates the separating rate of wax and oil, and enhances the separating effect of wax and oil.For the present invention on the basis of common sweating de-oiling method, the process of wax and oil separation is forced in increase, so as to improve purpose product yield, and can shorten the production cycle.The inventive method has the advantages that investment of production equipment is low, production process is simple and operating cost is low, solvent-free pollution.
Description
Technical field
The invention belongs to pertroleum wax production technical field, more particularly to a kind of preparation method of low melt point paraffin.
Background technology
The general name of the pertroleum wax obtained all kinds of wax products that are crude oil after refining is processed from wax-containing distillate, including liquid
Body paraffin, paraffin and microwax.Paraffin is that lube cut produces through steps such as dewaxing, de-oiling, refined and shapings in crude oil,
Typically contain C20~C30The component such as n-alkane, a small amount of isoparaffin and cycloalkane, usual fusing point is 50 DEG C~74 DEG C.
Dewaxing is that the process for the slack wax that oil content is 10~30% or so, dewaxing technique are prepared by raw material of lube cut
Mainly there are squeezing dewaxing and solvent dewaxing.De-oiling is that the process of scale wax of the oil content below 2% is prepared using slack wax as raw material, is taken off
Oily technique mainly has sweating de-oiling and solvent deoiling.Scale wax again through clay-filtered or hydrofinishing and shaping, packaging and other steps,
Both it can obtain paraffin grade wax.
Solvent deoiling method is in selective solvent（Acetone, benzene and toluene mixture；Or acetone, toluene；Or MEK,
Toluene）Solution in freeze, wax is separated with oily according to the property of wax and oil different solubility in selective solvent.
Solvent deoiling technique have production process is continuous, wax high income, finished product wax oil content can it is very low, production cost is more low excellent
Point, it is the main flow de-oiling technique of current large-scale production paraffin wax product.But solvent deoiling technique productions equipment investment is big；Produced
Need largely to use solvent in journey（Every part of scale wax uses 3~10 parts of solvent）, recycling design needs to consume substantial amounts of energy；
Contain benzene homologues in solvent, environment can be impacted；Solvent is inflammable, easily causes production accident.
Sweating de-oiling method is separated using the wax property different with oily fusing point.Point of various components in pertroleum wax
Son amount Bu Tong can all make its fusing point different with structure.When being all n-alkane structure, the larger n-alkane of molecular weight melts
Point is higher, and the fusing point of the less n-alkane of molecular weight is relatively low；When molecular weight is identical, the fusing point of isoparaffin and cycloalkane will
Less than n-alkane, and isomery degree more high-melting-point is lower, or even is just at normal temperatures liquid condition, i.e., usually said
Oil.Sweating de-oiling method only needed in process of production without using solvent, and in production process by raw material be heated to fusing point with
On temperature.
Common sweating degreasing process mainly includes the following steps that：（1）Preparation：Water is padded, is full of sweatbox with water
Ware plate lower space；（2）Charging：Load sweatbox when raw material is heated to more than fusing point being in a liquid state；（3）Decrease temperature crystalline：By original
Material progressively cools to below its fusing point 10~20 DEG C with the rate of temperature fall no more than 4 DEG C/h.In cooling procedure, various components are pressed
The order of fusing point from high to low crystallizes to form solid successively；（4）Heat up sweating：Temperature is terminated when wax layer temperature reaches default cooling
After degree, pad water is bled off；Raw material is slowly heated to default sweating final temperature again.It is various in the sweating effort that heats up
Component is successively fused into liquid by the order of fusing point from low to high and flowed out（Under wax）, the wax layer residue that finally obtains（On wax）
It is exactly high-melting-point, the wax of low oil-containing；（5）Crude product is collected：Heating sweating effort terminates follow-up high-temperature of continuing rising, is taken out with melting
On wax, as crude product；（6）Product purification, shaping, packaging：Subtractive process generally use is clay-filtered：After crude product is melted
Predetermined temperature is warming up to, carclazyte is added and is simultaneously filtered after constant temperature was stirred to the scheduled time；It is again purpose product through being molded, packing.
To common sweating de-oiling method, in the sweating effort that heats up although wax and oily two class components are respectively at solid and liquid
Body state, but also be difficult to be kept completely separate.To make the oil content of final products meet the requirements, generally use extends sweating sessions simultaneously
The method for improving sweating final temperature.Extending sweating sessions can cause the production cycle to be grown；Part can be made by improving sweating final temperature
Wax removes with oil, causes product yield to decline.
Common sweating de-oiling method can produce soap wax and low melt point paraffin of the fusing point at 40 DEG C~60 DEG C.Taken off with solvent
Oily method is compared, and sweating de-oiling is intermittently operated, and product yield is relatively low, the production cycle is longer, but sweating de-oiling method has
Have the advantages such as small investment, production process are simple, operating cost is low, still have at present part producer using this method production soap wax and
Low melt point paraffin product.
For many years, sweating de-oiling method has obtained some development, such as CN89214332 in production equipment and process aspect（It is vertical
Formula square multipul sections spacer diaphoresis tank）、CN94223980.6（Ware type sudorific device）、CN98233254.8（Paraffin sweating pot）、
CN200920033500.X（Novel paraffin sweating tank）、CN201210508905.0（A kind of Efficient paraffin sweatbox）、
CN201320127680.4（Tubular type paraffin deoiler）Deng being improved in sweating de-oiling production equipment；CN91206202
（A kind of high-efficient sweat pot for paraffin wax）Improved in sweating de-oiling technique.But these methods there are still product yield it is relatively low,
The shortcomings of production cycle is longer.
Sweating de-oiling method is currently known for the unique without molten of commercial scale soap wax and low melt point paraffin product
Agent de-oiling method, advocating green, low-carbon energy-saving the concern for being increasingly subject to people today.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of preparation method of low melt point paraffin, specifically general
On the basis of logical sweating de-oiling method, metallic particles is uniformly paved with wax layer surface before the sweating effort that heats up, and send out in heating
Wax layer is forced air flow through during sweat, carries out the oil in liquid, accelerates the separating rate of wax and oil, and enhances wax
With oil separating effect, so as to be effectively improved the yield of purpose product and shorten the production cycle.The inventive method has
The advantages that plant investment is low, production process is simple and operating cost is low, solvent-free pollution.
A kind of preparation method of low melt point paraffin of the present invention includes herein below：
（1）Water is padded in sweatbox；
（2）Using slack wax of the oil content less than 30% as raw material, load sweatbox after heating fusing；
（3）8 DEG C~20 DEG C are cooled to below slack wax fusing point with 1.0 DEG C/h~4.0 DEG C/h speed；
（4）The pad water in sweatbox is discharged, is then heated up with 0.5 DEG C/h~3.0 DEG C/h speed；In temperature-rise period
Force air flow through wax layer；Wax layer stops sweating after reaching predetermined temperature；
（5）Collect on wax；
（6）After refined, shaping it is purpose product on wax.
In the low melt point paraffin preparation method of the present invention, the oil content of described slack wax is less than 30% in mass, its fusing point
Scope is generally 45 DEG C~55 DEG C.Slack wax raw material can be vacuum 1st side cut or Light lube oil through slack wax made from dewaxing.
In the low melt point paraffin preparation method of the present invention, preferably in step（3）After middle raw material slack wax decrease temperature crystalline and
Step（4）Before middle heating sweating effort, the solid particle of 10~100 mesh, preferably 20~50 mesh is uniformly paved with the surface of wax layer.
The density of solid particle typically requires to be more than 4 g/cm3, can be the materials such as nonmetallic, metal and alloy, preferred density is 6~
12 g/cm3Metal and alloying pellet, such as zinc, iron, copper, lead and its more stable low price metal material of alloy chemical property
Matter.The solid particle of two or more unlike material density can be selected, various solid particles can phase in parts by weight
Near ratio mixing.The density contrast of two kinds of adjacent solid particle materials of density is 1~5 g/cm3.Density described herein is
Refer to the density for the material for forming solid particle, rather than the heap density of solid particle.Sweating effort can reclaim solid after terminating
Grain is simultaneously cleaned to reuse.
In the low melt point paraffin preparation method of the present invention, described sweatbox is generally sweating ware, and more than wax layer
Increase pressue device and/or increase vacuum extractor below wax layer.The described wax layer that forces air flow through is utilized in wax layer
Increase above air pressure and/or air pressure is reduced below wax layer, wax layer is formed what pressure differential was realized up and down.Described pressure differential one
As be 0.1~5.0 atmospheric pressure, preferably 0.2~2.0 atmospheric pressure, to force air flow through wax layer.
In the low melt point paraffin preparation method of the present invention, described rate of temperature fall preferably 2.0 DEG C/h~3.0 DEG C/h.
In the low melt point paraffin preparation method of the present invention, wherein in step（3）In be cooled to 10 below raw material slack wax fusing point
DEG C~15 DEG C.
In the low melt point paraffin preparation method of the present invention, described heating rate preferably 1.0 DEG C/h~2.0 DEG C/h.Step
（4）Described in heat up it is predetermined（Terminate）Temperature is less than 2 DEG C~10 DEG C of purpose product fusing point.
In the method for the present invention, the programming rate and cooling rate of said wax layer, air bath, water-bath, oil bath can be passed through
Or other feasible modes are controlled.
In the low melt point paraffin preparation method of the present invention, the described wax layer that forces air flow through can be in heating sweating effort
Any stage is implemented, and preferably implements initial stage in heating sweating.
In the low melt point paraffin preparation method of the present invention, the described wax layer that forces air flow through is utilized in the increasing of wax layer top
Realization with air pressure capable of being increased, the pressure preferably applied on wax layer top（Air pressure）For 0.2~2.0 atmospheric pressure（Gauge pressure）, and under wax layer
Side remains normal pressure.
In the low melt point paraffin preparation method of the present invention, the described wax layer that forces air flow through is utilized in wax layer bottom drop
What low pressure was realized, preferably the top of wax layer keeps normal pressure, and the pressure below wax layer（Air pressure）It is maintained -0.2~-1.0
Atmospheric pressure（Gauge pressure）.
Sweating de-oiling be using the wax property different with oily fusing point carry out separation production low melt point paraffin product, but
Heat up in sweating effort, the wax of solid-state and the oil of liquid are difficult to be kept completely separate in wax layer, this be due to wax and oily two kinds of components all
It is nonpolar hydrocarbon molecules, intermolecular force is larger；Simultaneously solid-state wax crystallization when form capillary pipe structure, have to oil compared with
Strong coating function, this results in only being difficult to be kept completely separate by wax in the common sweating effort of gravity natural separation and oil.It is existing
The oil content of final products is set to meet the requirements the methods of generally use extension sweating sessions, raising sweating final temperature in technology,
But these methods can cause production cycle length, wax product yield low again, influence the extensive use of sweating de-oiling technique.
The present invention is difficult to be kept completely separate reason by the further investigation to common sweating effort for wax and oil, by
Using air-flow to carry out the method for fluid oil by wax layer in heating sweating effort forces wax and oil to separate, and enhances wax and oil
Separating effect.And, it is also preferred that uniformly it is paved with the solid particle of 10~100 mesh on wax layer surface before the sweating effort that heats up.Rise
In warm sweating effort, as temperature raises, wax layer softens, because metallic particles is than great, under gravity with slower speed
Degree sedimentation, the tiny duct run through up and down is formed in wax layer, and be advantageous to the quick discharge of oil.Different densities and particle diameter are consolidated
The sinking speed of body particle is different, such as using the solid particle of mixing can ensure in the overall process that sweating takes off isoparaffin
The different height of wax layer has the passage of more discharge liquid isoparaffin, is more beneficial for the quick discharge of oil.
It is an advantage of the invention that：By carrying out fluid oil using forcing air flow through wax layer in the sweating effort that heats up
Method, enhance the separating effect of wax and oil；Simultaneously solid particle sink to during drop formed it is upper and lower tiny through wax layer
Duct, also more promote the quick discharge of oil.So as to reach raising wax product yield and shorten the purpose of production cycle.This
Inventive method plant investment is low, production process is simple and operating cost is low, solvent-free pollution environment, makes sweating de-oiling this without molten
Agent produces the method more highly effective of low melt point paraffin.
Embodiment
Sweating ware top connects dismountable sealing device and is connected with surge tank and compressor, and/or under sweating ware
Portion connects surge tank and vavuum pump；With water-bath or air bath control wax layer heating, cooling speed；, can before the sweating effort that heats up
Solid particle is uniformly paved with wax layer surface；Used in the sweating effort that heats up and malleation is formed on wax layer top and/or in wax layer
Bottom forms negative pressure and carries out the oil in liquid to force air flow through wax layer, enhances the separating effect of wax and oil.Pass through
These means, purpose product yield can be made to improve 5~10 percentage points, the time in heating sweating stage reduces 30%~60%.
1-3 by the following examples, illustrate the preparation method of low melt point paraffin of the present invention.
Embodiment 1
The present embodiment includes：（1）Preparation,（2）Charging,（3）Decrease temperature crystalline,（4）Heating sweating,（5）Crude product is received
Collection,（6）The processes such as product purification.
（1）Preparation
The sealing system on sweating ware top is connected with surge tank and compressor.
Pad water in sweating ware ware plate bottom.
Sweating ware chuck and removable coil pipe are connected with the circulatory system, using water as medium；Start the heating of the circulatory system
Function, recirculated water is set to be warming up to 55 DEG C.
（2）Charging
With second line of distillation slack wax（50.6 DEG C of fusing point, oil content 21.4%）For raw material, sweating ware is added after heating fusing；By disk
Pipe is immersed in raw material wax layer and fixed.
（3）Decrease temperature crystalline
Start the circulatory system refrigerating function, control wax layer temperature with 2.0 DEG C/h rate of temperature fall drop to 37.0 DEG C with
Wax layer is set to crystallize to form solid.Close the refrigerating function of the circulatory system.
（4）Heat up sweating
Discharge sweating ware pad water.
The outlet of sweating ware connects intermediate storage tank to receive under wax；Start the heating function of the circulatory system, with 1.5 DEG C/h liter
Warm speed makes wax layer temperature be increased to 43.0 DEG C；Connect sweating ware sealing device for upper portion of annular；Start compressor and keep in surge tank
Pressure stability is in 1.2~1.4 atmospheric pressure（Gauge pressure）, sweating ware ware plate lower section keeps normal pressure；Continue the heating speed with 1.5 DEG C/h
Rate makes wax layer temperature be increased to 49.0 DEG C of progress sweating de-oilings.
Stop compressor, terminate sweating degreasing process（Total heating-up time is 8 hours）.
（5）Crude product is collected
The outlet of sweating ware is changed to connect crude product storage tank to receive on wax；The circulatory system continues to be heated to 70 DEG C with molten
Change and take out on wax, as crude product.
（6）Product purification
Crude product is purpose product after clay-filtered, shaping, packaging.
Product property：
54.9 DEG C of fusing point, oil content 1.63%, meet commodity 54#The related technical requirements of semi-refined wax.
54#Semi-refined wax product yield is 43.7%（Relative raw material slack wax）.
Embodiment 2
The present embodiment includes：（1）Preparation,（2）Charging,（3）Decrease temperature crystalline,（4）Heating sweating,（5）Crude product is received
Collection and metallic particles recovery,（6）The processes such as product purification.
（1）Preparation
The sealing system on sweating ware top is connected with surge tank and compressor.
Pad water in sweating ware ware plate bottom；In sweating ware ware plate upper berth bilayer Medium speed filter paper.
Sweating ware chuck and removable coil pipe are connected with the circulatory system, using water as medium；Start the heating of the circulatory system
Function, recirculated water is set to be warming up to 55 DEG C.
The copper particle and iron particle of the mesh of 30 mesh~50 are screened out, is by ratio of weight and the number of copies 1：1 is well mixed.
（2）Charging
With second line of distillation slack wax（Property is the same as embodiment 1）For raw material, the sweating ware for completing filter paper is added after heating fusing；By disk
Pipe is immersed in raw material wax layer and fixed.
（3）Decrease temperature crystalline
Start the circulatory system refrigerating function, control wax layer temperature with 2.0 DEG C/h rate of temperature fall drop to 37.0 DEG C with
Wax layer is set to crystallize to form solid.Close the refrigerating function of the circulatory system.
Foregoing copper, iron hybrid particles are paved with wax layer surface.
（4）Heat up sweating
Discharge sweating ware pad water.
The outlet of sweating ware connects intermediate storage tank to receive under wax；Start the heating function of the circulatory system, with 1.5 DEG C/h liter
Warm speed makes wax layer temperature be increased to 43.0 DEG C；Connect sweating ware sealing device for upper portion of annular；Start compressor and keep in surge tank
Pressure stability is in 1.2~1.4 atmospheric pressure（Gauge pressure）, sweating ware ware plate lower section keeps normal pressure；Continue with 1.5 DEG C/h heating rate
Wax layer temperature is set to be increased to 49.0 DEG C of progress sweating de-oilings.
Stop compressor, terminate sweating degreasing process（Total heating-up time is 8 hours）.
（5）Crude product is collected and metallic particles recovery
The outlet of sweating ware is changed to connect crude product storage tank to receive on wax；The circulatory system continues to be heated to 70 DEG C with molten
Change and take out on wax, as crude product.
The mixed metal particles on filter paper are collected, cleaning, are dried in case reusing.
（6）Product purification
Crude product is purpose product after clay-filtered, shaping, packaging.
Product property：
55.2 DEG C of fusing point, oil content 1.41%, meet commodity 54#The related technical requirements of semi-refined wax.
54#Semi-refined wax product yield is 46.8%（Relative raw material slack wax）.
Embodiment 3
The present embodiment includes：（1）Preparation,（2）Charging,（3）Decrease temperature crystalline,（4）Heating sweating,（5）Crude product is received
Collection and metallic particles recovery,（6）The processes such as product purification.
（1）Preparation
Surge tank is installed in sweating ware bottom and connects vavuum pump.
Pad water in sweating ware ware plate bottom；In sweating ware ware plate upper berth bilayer Medium speed filter paper.
The lead particle and zinc particle of the mesh of 30 mesh~50 are screened out, by weight being 1：1 is well mixed.
（2）Charging
With second line of distillation slack wax（Property is the same as embodiment 1）For raw material, the sweating ware for completing filter paper is added after heating fusing.
（3）Decrease temperature crystalline
37.0 DEG C are cooled to so that wax layer, which crystallizes, to form solid with 3.0 DEG C/h speed with air bath control wax layer.
Foregoing lead and zinc hybrid particles are uniformly paved with wax layer surface.
（4）Heat up sweating
Discharge sweating ware pad water.
The outlet of sweating ware connects intermediate storage tank to receive under wax；Start vavuum pump and keeping buffer pressure inside the tank it is stable-
0.5~-0.7 atmospheric pressure（Gauge pressure）, wax layer top keeps normal pressure；Wax layer is controlled with 2.0 DEG C/h heating rate with air bath
Wax layer temperature is set to be increased to 49.0 DEG C of progress sweating de-oilings.
Stop vavuum pump, terminate sweating effort（Total heating-up time is 6 hours）.
（5）Crude product is collected and metallic particles recovery
The outlet of sweating ware is changed to connect crude product storage tank to receive on wax；70 DEG C are warming up to molten with air bath control wax layer
Change and take out on wax, as crude product.
The mixed metal particles on filter paper are collected, cleaning, are dried in case reusing.
（6）Product purification
Crude product is purpose product after clay-filtered, shaping, packaging.
Product property：
55.1 DEG C of fusing point, oil content 1.47%, meet 54#The related technical requirements of semi-refined wax.
54#Semi-refined wax product yield is 46.6%（Relative raw material slack wax）.
Comparative example 1
With second line of distillation slack wax（Property is the same as embodiment 1）For raw material, common sweat tank is added after heating fusing.With 2.0 DEG C/h
Rate of temperature fall wax layer temperature is dropped to 37.0 DEG C；Make wax layer temperature be increased to 51.0 DEG C with 1.0 DEG C/h heating rate to enter
Row sweating de-oiling（Total heating-up time is 14 hours）.Sweating is taken out on wax after terminating, and is produced for the purpose of being after clay-filtered, shaping
Product.
Product property：
55.6 DEG C of fusing point, oil content 1.75%, meet commodity 54#The related technical requirements of semi-refined wax.
54#Semi-refined wax product yield is 37.4%.
Comparing embodiment 1-3 and comparative example 1 can be seen that the production method of low melt point paraffin of the present invention, by wax layer
Surface spreads metallic particles to form the tiny duct run through up and down in sweating effort, and using pressure in the sweating effort that heats up
Air-flow accelerates the rate of departure of wax and oil by the method for wax layer, and enhances the separating effect of wax and oil, so as to improve
Purpose wax product yield（Embodiment 1-3 adds 6.3,9.4 and 9.2 percentage points than comparative example 1 respectively）And shorten production
Cycle（The time in heating sweating stage, embodiment 1-3 reduce 43%, 43% and 57% than comparative example 1 respectively）.
Claims (20)
1. a kind of preparation method of low melt point paraffin, including herein below：
（1）Water is padded in sweatbox；
（2）It is less than 30% with oil content, fusing point is that 45 DEG C~55 DEG C of slack wax is raw material, loads sweatbox after heating fusing；
（3）8 DEG C~20 DEG C are cooled to below slack wax fusing point with 1.0 DEG C/h~4.0 DEG C/h speed；
（4）The pad water in sweatbox is discharged, is then heated up with 0.5 DEG C/h~3.0 DEG C/h speed；Forced in temperature-rise period
Air-flow passes through wax layer；Wax layer stops sweating after reaching predetermined temperature；
（5）Collect on wax；
（6）After refined, shaping it is purpose product on wax；
Wherein, in step（3）After middle raw material slack wax decrease temperature crystalline, and in step（4）Before middle heating sweating effort, in wax layer table
Face is uniformly paved with solid particle.
2. in accordance with the method for claim 1, it is characterised in that it is described force air flow through wax layer be utilized in wax layer with
It is upper to increase air pressure and/or air pressure is reduced below wax layer, wax layer is formed what pressure differential was realized up and down, described pressure differential is
0.1~5.0 atmospheric pressure.
3. in accordance with the method for claim 1, it is characterised in that the mesh number of the solid particle is 10~100 mesh.
4. in accordance with the method for claim 3, it is characterised in that the density of the solid particle is more than 4 g/cm3。
5. in accordance with the method for claim 3, it is characterised in that methods described also includes herein below：Sweating effort terminates
Solid particle is reclaimed afterwards and is cleaned to reuse.
6. in accordance with the method for claim 3, it is characterised in that the material of the solid particle be zinc, iron, copper, lead and its
One or more in alloy.
7. in accordance with the method for claim 6, it is characterised in that described solid particle selects two or more unlike materials
The solid particle of density, the ratio mixing similar in parts by weight of two or more solid particles.
8. in accordance with the method for claim 7, it is characterised in that two kinds of adjacent solids of two or more solid particle Midst densities
The density contrast of particle is 1~5 g/cm3。
9. in accordance with the method for claim 1, it is characterised in that described sweatbox is sweating ware.
10. in accordance with the method for claim 1, it is characterised in that step（3）In be cooled to 10 DEG C~15 below slack wax fusing point
℃。
11. in accordance with the method for claim 1, it is characterised in that described forces air flow through wax layer in heating sweating
Journey any stage is implemented.
12. in accordance with the method for claim 1, it is characterised in that described rate of temperature fall is 2.0 DEG C/h~3.0 DEG C/h.
13. in accordance with the method for claim 1, it is characterised in that described heating rate is 1.0 DEG C/h~2.0 DEG C/h.
14. in accordance with the method for claim 1, it is characterised in that step（4）The predetermined temperature of middle heating is to be produced less than purpose
2 DEG C~10 DEG C of the fusing point of product.
15. in accordance with the method for claim 2, it is characterised in that the described wax layer that forces air flow through is utilized in wax layer
Top increase air pressure realizes that the gauge applied above wax layer is 0.2~2.0 atmospheric pressure, and is remained below wax layer
Normal pressure.
16. in accordance with the method for claim 2, it is characterised in that the described wax layer that forces air flow through is utilized in wax layer
Lower section reduces what air pressure was realized, and normal pressure is kept above wax layer, and the gauge below wax layer is maintained -0.2~-0.8
Atmospheric pressure.
17. in accordance with the method for claim 2, it is characterised in that described pressure differential is 0.2~2.0 atmospheric pressure.
18. in accordance with the method for claim 3, it is characterised in that the mesh number of the solid particle is 20~50 mesh.
19. in accordance with the method for claim 4, it is characterised in that the density of the solid particle is 6~12 g/cm3。
20. in accordance with the method for claim 11, it is characterised in that described forces air flow through wax layer in heating reality at initial stage
Apply.
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| GB687235A (en) * | 1950-03-24 | 1953-02-11 | Bataafsche Petroleum | Improvements in and relating to the treatment of paraffin wax |
| CN1111566C (en) * | 2000-10-26 | 2003-06-18 | 中国石油化工股份有限公司 | Wax compositions for thermosensitive switch |
| CN1176191C (en) * | 2002-05-15 | 2004-11-17 | 中国石油化工股份有限公司 | Wax dielectric for heating temperature control valve and its preparing method |
| CN1183203C (en) * | 2002-05-15 | 2005-01-05 | 中国石油化工股份有限公司 | Wax dielectric for thermosensitive switch |
| CN1243073C (en) * | 2003-10-24 | 2006-02-22 | 中国石油化工股份有限公司 | Temerature sensitive medium for wax temperature controlling valve and its prepn process |
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