阅读说明：本技术 一种聚乙烯蜡用聚乙烯裂解制备方法 (Polyethylene cracking preparation method for polyethylene wax ) 是由 曹春华 潘桂兵 罗建军 于 2021-08-03 设计创作，主要内容包括：本发明公开了一种聚乙烯蜡用聚乙烯裂解制备方法,属于聚乙烯蜡技术领域,该聚乙烯蜡用聚乙烯裂解制备方法,包括以下步骤：步骤一、原料准备,对聚乙烯材料和废旧回收的聚乙烯材料进行混合得到聚乙烯混合料,随后准备对费托精制蜡进行预处理,所有原料干燥后待用。该聚乙烯蜡用聚乙烯裂解制备方法,通过对费托精制蜡,可以实现对聚乙烯预备裂解的反应基础,实现对聚乙烯进行稳定的加热分解,且通过费托精制蜡和加热后的氩气,可以实现对后续的需要加热的费托精制蜡进行再次的加热,降低能耗比的前提下,保证生产的效率,且降低生产的难度,随后利用余热加热,降低下一批次聚乙烯蜡的生产热量所需。(The invention discloses a preparation method for polyethylene cracking for polyethylene wax, belonging to the technical field of polyethylene wax, and the preparation method for polyethylene cracking for polyethylene wax comprises the following steps: step one, raw material preparation, namely mixing a polyethylene material and a waste and old recovered polyethylene material to obtain a polyethylene mixture, then preparing to pretreat Fischer-Tropsch refined wax, and drying all the raw materials for later use. This polyethylene wax polyethylene cracking preparation method, through to the Fischer-Tropsch refined wax, can realize preparing the reaction basis of schizolysis to the polyethylene, realize carrying out stable heating decomposition to the polyethylene, and through the argon gas after Fischer-Tropsch refined wax and the heating, can realize carrying out heating once more to the subsequent Fischer-Tropsch refined wax that needs the heating, under the prerequisite that reduces the energy consumption ratio, guarantee the efficiency of production, and reduce the degree of difficulty of production, utilize waste heat heating afterwards, it is required to reduce the production heat of next batch polyethylene wax.)

1. The preparation method of polyethylene wax by polyethylene cracking comprises the following steps:

s1, preparing raw materials, namely mixing the polyethylene materials and the waste and recovered polyethylene materials to obtain a polyethylene mixture, then preparing to pretreat the Fischer-Tropsch refined wax, and drying all the raw materials for later use;

s2, mixing and heating, preferentially heating the Fischer-Tropsch refined wax, putting the polyethylene mixture into a sealed container after heating to be molten, introducing inert gas for protection, and stably heating the polyethylene mixture to produce the polyethylene wax;

s3, heat circulation and waste heat collection, and the surplus Fischer-Tropsch refined wax and the surplus inert gas are collected and insulated for standby;

and S4, circulating production, putting the next batch of polyethylene mixture into the heat-preservation Fischer-Tropsch refined wax and the inert gas, primarily heating to realize production, and collecting, preserving heat and storing the rest Fischer-Tropsch refined wax and the inert gas again.

2. The method for preparing polyethylene wax by polyethylene pyrolysis according to claim 1, characterized by comprising the following steps: according to the operation step in S1, the waste recovered polyethylene material is subjected to washing, drying, crushing and screening processes.

3. The method for preparing polyethylene wax by polyethylene pyrolysis according to claim 2, characterized by comprising the following steps: according to the operation step in S1, the Fischer-Tropsch refined wax is pretreated into drying treatment to reduce the water content and the content of other impurities.

4. The method for preparing polyethylene wax by cracking polyethylene according to claim 3, comprising the steps of: according to the operation step in the S2, the Fischer-Tropsch refined wax is pretreated, namely the Fischer-Tropsch refined wax with the content of 20% needs to be heated at the temperature of 110 ℃ until the Fischer-Tropsch refined wax is melted.

5. The method for preparing polyethylene wax by polyethylene pyrolysis according to claim 4, characterized by comprising the following steps: according to the operating step in S2, the inert gas is argon.

6. The method for preparing polyethylene wax by polyethylene cracking according to claim 5, comprising the following steps: according to the operation step in S3, the heating temperature of the sealed container is maintained at a range of 375 to 385 degrees celsius.

7. The method for preparing polyethylene wax by polyethylene pyrolysis according to claim 6, characterized by comprising the following steps: according to the operation procedure in S3, the heated argon gas is collected by a gas collection device having a heat retention function, and during the collection, additional gas purification is performed to remove volatile compounds such as acids, esters, unsaturated hydrocarbons, peroxides, carbon monoxide, carbon dioxide, formaldehyde, acetaldehyde, and the like.

8. The method for preparing polyethylene wax by polyethylene pyrolysis according to claim 7, comprising the following steps: according to the operation step in the S3, the heat preservation measure can be performed by adopting a heat exchange water tank, and the collected waste heat is used for heating and melting the Fischer-Tropsch refined wax.

9. The method for preparing polyethylene wax by polyethylene cracking according to claim 8, comprising the steps of: according to the operation in S4, the temperature of the inert gas is lowered to between 100 degrees celsius and 135 degrees celsius after the heat exchange.

10. The method for preparing polyethylene wax by polyethylene pyrolysis according to claim 9, comprising the steps of: according to the operation in S4, the inert gas is introduced into the sealed container again through heat exchange, and the inert gas is replenished at any time.

Technical Field

The invention relates to the technical field of polyethylene wax, in particular to a preparation method for polyethylene used for polyethylene wax by pyrolysis.

Background

The polyethylene wax (PE wax), also called polymer wax for short, is widely used because of its excellent cold resistance, heat resistance, chemical resistance and wear resistance, in normal production, the wax can be directly added into polyolefin processing as an additive, it can increase the gloss and processing performance of the product, as a lubricant, it has stable chemical property and good electrical performance, the polyethylene wax has good compatibility with polyethylene, polypropylene, polyvinyl acetate, ethylene propylene rubber and butyl rubber, it can improve the fluidity of polyethylene, polypropylene and ABS and the demoulding performance of polymethyl methacrylate and polycarbonate, and the polyethylene wax has stronger internal lubricating effect compared with PVC and other external lubricants.

At present, for the production of polyethylene wax, polyethylene is usually decomposed into single chains with smaller molecular mass, then the polyethylene wax is prepared by mixing glycerol and wax, polypropylene is subjected to high-temperature pyrolysis through screw extrusion in the actual production process, the heating temperature needs 500 ℃, and then macromolecules can be opened, or a catalyst is adopted and heated to 300-400 ℃, and no matter which production mode is adopted, the energy consumption ratio is higher, the production efficiency is lower, and the scale and the production efficiency cannot be rapidly enlarged.

Disclosure of Invention

The invention aims to provide a method for preparing polyethylene for polyethylene wax by cracking. According to the polyethylene cracking preparation method for the polyethylene wax, provided by the invention, the reaction basis of the polyethylene preparation cracking can be realized through Fischer-Tropsch refined wax, the polyethylene is stably heated and decomposed, the subsequent Fischer-Tropsch refined wax to be heated can be heated again through the Fischer-Tropsch refined wax and the heated argon, the production efficiency is ensured on the premise of reducing the energy consumption ratio, the production difficulty is reduced, and the production heat requirement of the next batch of polyethylene wax is reduced by utilizing the waste heat for heating.

In order to achieve the above effects, the present invention provides the following technical solutions: the preparation method of polyethylene wax by polyethylene cracking comprises the following steps:

step one, raw material preparation, namely mixing a polyethylene material and a waste and old recovered polyethylene material to obtain a polyethylene mixture, then preparing to pretreat Fischer-Tropsch refined wax, and drying all the raw materials for later use.

And step two, mixing and heating, namely preferentially heating the Fischer-Tropsch refined wax, putting the polyethylene mixture into a sealed container after heating until the Fischer-Tropsch refined wax is molten, introducing inert gas for protection, and stably heating the polyethylene mixture to produce the polyethylene wax.

And step three, thermal circulation and waste heat collection, wherein the redundant Fischer-Tropsch refined wax and the redundant inert gas are collected and insulated for standby.

And step four, circulating production, namely putting the next batch of polyethylene mixture into the heat-insulating Fischer-Tropsch refined wax and the inert gas, primarily heating to realize production, and collecting, preserving heat and storing the rest Fischer-Tropsch refined wax and the inert gas again.

Further, the method comprises the following steps: according to the operation steps in the step one, the waste and recovered polyethylene material needs to be cleaned, dried, crushed and screened.

Further, the method comprises the following steps: according to the operation steps in the step one, the Fischer-Tropsch refined wax is pretreated into drying treatment, so that the water content and the content of other impurities are reduced.

Further, the method comprises the following steps: according to the operation steps in the second step, the Fischer-Tropsch refined wax is pretreated, namely the Fischer-Tropsch refined wax with the content of 20% needs to be heated at the temperature of 110 ℃ until the Fischer-Tropsch refined wax is melted.

Further, the method comprises the following steps: according to the operating step in step two, the inert gas is argon.

Further, the method comprises the following steps: according to the operation steps in the third step, the heating temperature of the sealed container is maintained between 375 and 385 ℃.

Further, the method comprises the following steps: according to the operation steps in the third step, the heated argon is collected by a gas collecting device with a heat preservation function, and during collection, gas purification is additionally carried out to remove volatile mixtures such as acid, ester, unsaturated hydrocarbon, peroxide, carbon monoxide, carbon dioxide, formaldehyde, acetaldehyde and the like.

Further, the method comprises the following steps: according to the operation steps in the third step, the heat preservation measures can be carried out by adopting a heat exchange water tank, and the collected waste heat is used for heating and melting the Fischer-Tropsch refined wax.

Further, the method comprises the following steps: according to the operation step in the fourth step, the temperature of the inert gas is reduced to 100-135 ℃ after heat exchange.

Further, the method comprises the following steps: according to the operating step in step four, the inert gas is re-introduced into the sealed container after heat exchange, and the inert gas is replenished at any time.

The invention provides a polyethylene cracking preparation method for polyethylene wax, which has the following beneficial effects:

this polyethylene wax polyethylene cracking preparation method, through to the Fischer-Tropsch refined wax, can realize preparing the reaction basis of schizolysis to the polyethylene, realize carrying out stable heating decomposition to the polyethylene, and through the argon gas after Fischer-Tropsch refined wax and the heating, can realize carrying out heating once more to the subsequent Fischer-Tropsch refined wax that needs the heating, under the prerequisite that reduces the energy consumption ratio, guarantee the efficiency of production, and reduce the degree of difficulty of production, utilize waste heat heating afterwards, it is required to reduce the production heat of next batch polyethylene wax.

Drawings

FIG. 1 is a schematic view of the preparation method of the present invention.

Detailed Description

The invention provides a technical scheme that: referring to fig. 1, a method for preparing polyethylene wax by polyethylene cracking includes the following steps:

step one, raw material preparation, namely mixing a polyethylene material and a waste and old recovered polyethylene material to obtain a polyethylene mixture, then preparing to pretreat Fischer-Tropsch refined wax, and drying all the raw materials for later use.

And step two, mixing and heating, namely preferentially heating the Fischer-Tropsch refined wax, putting the polyethylene mixture into a sealed container after heating until the Fischer-Tropsch refined wax is molten, introducing inert gas for protection, and stably heating the polyethylene mixture to produce the polyethylene wax.

And step three, thermal circulation and waste heat collection, wherein the redundant Fischer-Tropsch refined wax and the redundant inert gas are collected and insulated for standby.

And step four, circulating production, namely putting the next batch of polyethylene mixture into the heat-insulating Fischer-Tropsch refined wax and the inert gas, primarily heating to realize production, and collecting, preserving heat and storing the rest Fischer-Tropsch refined wax and the inert gas again.

Specifically, the method comprises the following steps: according to the operation steps in the step one, the waste and old recycled polyethylene materials need to be cleaned, dried, crushed and screened.

Specifically, the method comprises the following steps: according to the operation steps in the step one, the Fischer-Tropsch refined wax is pretreated into drying treatment, so that the water content and the content of other impurities are reduced.

Specifically, the method comprises the following steps: and (3) according to the operation steps in the second step, pretreating the Fischer-Tropsch refined wax, wherein the Fischer-Tropsch refined wax with the content of 20% needs to be heated until the Fischer-Tropsch refined wax is melted, and the heating temperature is 110 ℃.

Specifically, the method comprises the following steps: according to the operating step in step two, the inert gas is argon.

Specifically, the method comprises the following steps: according to the operation steps in the third step, the heating temperature of the sealed container is maintained between 375 ℃ and 385 ℃.

Specifically, the method comprises the following steps: according to the operation steps in the third step, the heated argon is collected by a gas collecting device with a heat preservation function, and during collection, gas purification is additionally carried out to remove volatile mixtures such as acid, ester, unsaturated hydrocarbon, peroxide, carbon monoxide, carbon dioxide, formaldehyde, acetaldehyde and the like.

Specifically, the method comprises the following steps: according to the operation steps in the third step, the heat preservation measures can be carried out by adopting a heat exchange water tank, and the collected waste heat is used for heating and melting the Fischer-Tropsch refined wax.

Specifically, the method comprises the following steps: according to the operation step in the fourth step, the temperature of the inert gas is reduced to 100-135 ℃ after heat exchange.

Specifically, the method comprises the following steps: according to the operation step in the fourth step, the inert gas is introduced into the sealed container again after heat exchange, and the inert gas is replenished at any time.

The method of the examples was performed for detection analysis and compared to the prior art to yield the following data:

	production efficiency	Energy consumption ratio	Efficiency of environmental protection
				Examples	Is higher than	Is lower than	Is higher than
Prior Art	Is lower than	Is higher than	Is lower than

According to the table data, when the embodiment is implemented, the preparation method for polyethylene by cracking polyethylene wax further improves the production efficiency under the condition of ensuring that the production conditions are easy to obtain, reduces the energy consumption ratio through thermal circulation, and can improve the utilization rate of waste and improve the environmental protection efficiency through recycling the inert gas and the Fischer-Tropsch refined wax for multiple times.

The invention provides a polyethylene cracking preparation method for polyethylene wax, which comprises the following steps: step one, raw material preparation, mixing polyethylene materials and waste and old recovered polyethylene materials to obtain a polyethylene mixture, then preparing to pretreat Fischer-Tropsch refined wax, drying all the raw materials for later use, cleaning, drying, crushing and screening the waste and old recovered polyethylene materials, wherein the pretreatment of the Fischer-Tropsch refined wax is drying treatment, the water content and the content of other impurities are reduced, the heating loss caused by impurities can be reduced by reducing the water content, step two, mixing and heating are carried out, the Fischer-Tropsch refined wax is preferentially heated, after the Fischer-Tropsch refined wax is heated to be molten, the polyethylene mixture is put into a sealed container, inert gas is introduced for protection, the polyethylene wax is stably heated to produce polyethylene wax, the Fischer-Tropsch refined wax is pretreated, the Fischer-Tropsch refined wax with the content of 20 percent needs to be heated, the heating temperature is 110 ℃, heating until the melting, wherein the inert gas is argon, preheating Fischer-Tropsch refined wax to ensure the temperature stability of polyethylene cracking, wrapping the polyethylene by the Fischer-Tropsch refined wax to realize efficient cracking reaction and reduce the energy consumption required by cracking, collecting the residual heat and the residual heat, collecting and preserving the residual Fischer-Tropsch refined wax and the inert gas for standby, maintaining the heating temperature of a sealed container at a range of 375-385 ℃, collecting the heated argon by a gas collecting device with a heat preservation function, additionally performing gas purification during collection, removing volatile mixtures such as acid, ester, unsaturated hydrocarbon, peroxide, carbon monoxide, carbon dioxide, formaldehyde, acetaldehyde and the like, preserving heat by adopting a heat exchange water tank, and collecting the residual heat for heating and melting the Fischer-Tropsch refined wax, inert gas can protect by the efficient, and trade name polyethylene wax takes place the oxidation, step four, circulation production, and the heat retaining ft refined wax and inert gas are put into to next batch polyethylene mixture, carry out the primary heating and can realize production, collect once more to remaining ft refined wax and inert gas and keep warm and store, and inert gas is after the heat exchange, and the temperature reduces to between 100 degrees centigrade-135 degrees centigrade, and inert gas is in letting in sealed container once more through the heat exchange, supplements inert gas at any time.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.