KR20020021760A - Continuous system and its operating method for producing polyolefin wax using horizontal thermal-cracking reactor - Google Patents

Abstract

PURPOSE: Provided is an apparatus for continuously producing polyolefine wax by means of a continuous pyrolysis to reduce time taken, save production cost and energy and to ensure working safety by conducting the pyrolysis process at an ordinary pressure. CONSTITUTION: The apparatus comprises an extrusion device(1), a horizontal pyrolysis reactor(2), a tank(4) for recovering low molecular weight wax and a cooler(5). The extrusion device delivers a raw material into the reactor after fusing it. The horizontal reactor is constructed of several chambers by compartments(6) having opened tops and delivers the raw material of one of the chambers during the pyrolysis reaction to a next one. The reactor(2) is attached by another device to introduce nitrogen gas or other solvent at lower end portion of the reactor. The solvent is effective to remove the low molecular weight wax.

Description

Continuous system for producing polyolefin wax using horizontal pyrolysis reactor and its operating method {continuous system and its operating method for producing polyolefin wax using horizontal thermal-cracking reactor}

The present invention relates to a device capable of controlling the molecular weight distribution of a wax by using a solvent extraction method in addition to continuously producing a wax using a horizontal pyrolysis reactor in the process of producing a polyolefin wax, in particular In the production of polyolefin wax, the low molecular weight material generated during the pyrolysis reaction can be recovered under normal pressure to improve the quality of the wax, and the continuous pyrolysis reaction improves the productivity than the batch reaction, thereby reducing the production cost and reacting the atmospheric pressure. The present invention relates to a device and a method for producing a high value wax by minimizing the size of a vaccum reactor to increase production safety and to freely control the molecular weight distribution.

Polyolefin waxes are mainly used as additives as lubricants and fluidity enhancers in various plastic processing, as well as swelling and abrasion agents for printing inks, toner lubricants and fusion aids, leveling and lubricating agents for powder coatings, high temperature properties and viscosity of hot melt adhesives, It is used as a cosmetic component, a modifier for improving the hardness and melting point of other waxes, a component of thermal transfer ink, a component of a compound of an electric cable, and the like.

Conventionally, a batch method has been selected for producing polyolefin waxes using pyrolysis. Batch method reduces the productivity by maximizing the size of the reactor in order to increase the production, energy consumption in the process of raising and lowering the temperature, there is a risk of cost rise and safety accidents, and low-molecular weight material generated during the pyrolysis process It contains a lot and tends to be of poor quality. In particular, the conventional batch method is difficult to control the molecular weight distribution of the produced wax by itself, it is difficult to apply to a special product due to the wide molecular weight distribution it was difficult to create high added value.

In order to solve the above problems, an object of the present invention is to produce a pyrolysis wax capable of low operating cost by using a small-scale continuous pyrolysis reaction apparatus to perform the reaction at normal pressure to reduce energy and production costs, and the manufacturing process The present invention provides a polyolefin wax manufacturing apparatus and a method of operating the same, which can be used as a special additive by narrowing the molecular weight of the wax by using a solvent extraction method in a reactor to create a high value.

1 is a schematic view of a continuous polyolefin wax production apparatus of the present invention.

<Explanation of symbols for main parts of the drawings>

(1): raw material feed extruder (2): horizontal pyrolysis reactor

(3): agitator (4): condensation tank of volatile substances

(5): wax cooler 6: partition

(7): nitrogen and solvent input device

The present invention relates to a continuous polyolefin wax production apparatus using the pyrolysis method, the object of which is to produce a wax at a low cost and operating cost, the configuration of the device to increase the added value by adjusting the molecular weight distribution and its operation principle and method Is done.

1 is a schematic diagram of a continuous wax production process, the configuration of the present invention to construct a continuous polyolefin wax production apparatus using pyrolysis

A raw material conveying extruder (1) for melting raw materials and transporting them to the reactor, a pyrolysis reactor (2) for pyrolyzing the transferred raw materials to produce wax, a stirrer motor (3) for rotating the stirrer in the reactor, and generated during the pyrolysis reaction A condenser for condensing low molecular weight wax and low molecular weight wax and volatilized solvent, and a condensation tank for storing the condensed volatile material (4), a heat exchange cooling device (5) for cooling the wax produced by pyrolysis, It consists of a nitrogen storage tank which stores nitrogen which is an inert gas, and the solvent storage tank 7 which stores the solvent for adjusting molecular weight distribution.

Referring to the operation method of the present invention configured as described above are as follows.

The polyolefin raw material to be used for wax production is introduced into an extruder hopper, and the raw material is melted at a predetermined temperature or more in the raw material transport extruder (1) and then transferred to the pyrolysis reactor (2). The pyrolysis reactor 2 installed each partition 6 and the upper part was spaced so that it was naturally transported to the next room as it was pyrolyzed, which can be expected to shorten the reaction time and increase the reaction effect. The stirrer was rotated by operating the stirrer motor 3 so that the raw materials were constantly decomposed, and the volatile substances occupied in the upper space were naturally collected in the condenser, condensed, and then moved to the condenser tank 4. When the molecular weight distribution needs to be adjusted, the solvent was opened by opening the valve of the solvent storage tank 7, and the solvent and the low molecular weight material after the reaction were allowed to move to the condensation tank 4 through the condenser. After the pyrolysis reaction, the wax-made product is transferred to the heat exchange cooling device 5, cooled to a predetermined temperature, and then transferred to a lower production facility leading to the packaging of the finished product.

Example 1

Raw material feed The extruder hopper feeds the polyolefin raw material and operates the extruder to be heated to 200 ° C to transfer the molten raw material to the first chamber of the horizontal pyrolysis reactor. The pyrolysis reactor is heated to a temperature of 300 to 400 degrees Celsius. When the raw materials are different in the first room, the pyrolysis reactor is naturally transferred to the next room through the open space in the upper part. To make the pyrolysis reaction uniform. In the same way, the pyrolysis reaction takes place slowly as the raw material is transferred to the next room, and in the last fifth room, the pyrolysis takes place completely to produce a wax. The low molecular weight volatiles generated during the production are introduced into the volatile condensation tank through a pipe located at the top of the reactor end, cooled and condensed through the condenser and collected in the storage tank. The wax is introduced into the wax cooler through the lower pipe of the fifth room, and the wax cooled to 200 ° C or lower by the heat exchanger is dropped to the water tank located at the bottom of the wax cooler, cooled to room temperature, and then manufactured by the grinding operation. Could. As a result of analyzing the recovered wax by gel permeation chromatography, the molecular weight was distributed from 1000 to 3000, indicating that a complete polyolefin wax was produced.

Example 2

In order to control the molecular weight distribution of the thermally decomposed wax, the heptane solvent was added by installing a solvent input pipe at the bottom of the fourth chamber where the pyrolysis was completed and the wax was prepared. The charged heptane solvent is kneaded with the molten wax, and the low molecular weight wax and the wax volatiles generated during pyrolysis are volatilized like heptane and introduced into the solvent and low molecular weight wax condenser through a pipe mounted at the upper layer. You move to the room. The low molecular weight wax is mixed with the solvent introduced into the condenser and the low molecular weight wax is collected at the lower part of the condenser due to the difference of volatilities, and the heptane solvent is recovered from the upper part of the condenser and recycled to the pyrolysis reactor. The molecular weight and molecular weight distribution of the wax prepared after the heptane solvent extraction reaction were analyzed by gel permeation chromatography. The average molecular weight was 3000 and the molecular weight distribution was 1.5.

Comparative Example 1

The productivity of the conventional batch pyrolysis wax production apparatus and the continuous horizontal pyrolysis wax production apparatus of the present invention was compared. In the batch pyrolysis wax production apparatus, 500 grams of raw material was added to a reactor of 1 liter, and the pyrolysis reaction was continued for 3 hours while heating at 300 ° C. The pyrolysis is completed and the wax is generated can be confirmed by measuring the viscosity, and when the process is completed, the heat is cut off and the raw material is discharged by opening the outlet bottom of the reactor. It is necessary to increase the temperature by inputting new raw materials and applying heat to decomposition temperature again, which can be judged to be a waste of energy and low productivity.

When using a continuous horizontal pyrolysis reactor adopted in the present invention, when the reactor is manufactured to a size of 1 liter, 500 grams of raw material is added to a raw material feed extruder and preheated to a continuous pyrolysis reactor heated to a temperature of 300 ° C. It is estimated that the time required to produce the wax by the completion of the transfer and the pyrolysis reaction can be reduced to about one hour, and the production period can be reduced to one third. Since the continuous operation is performed under continuous heating, the energy demand is higher than that of the batch reactor. It was much smaller.

Since the present invention as described above is a device that continuously generates pyrolysis, it is possible to expect the production cost and energy saving effect by shortening the pyrolysis time, and because of the high value added of the product by the molecular weight distribution control and the reaction device at normal pressure, the operation safety during production You can expect high results for this as well.

Claims (4)

In the apparatus for producing a polyolefin wax using the pyrolysis reaction, in order to configure a device for simultaneously processing the pyrolysis reaction and the molecular weight distribution control reaction, An apparatus for producing continuous polyolefin wax, comprising an extrusion device (1), a horizontal pyrolysis reactor (2), a low molecular weight wax recovery tank (4), and a cooler (5) for melting and transporting raw materials to a reactor. The method of claim 1, Manufacture of continuous polyolefin wax characterized in that the partition (6) having an upper portion open in the horizontal pyrolysis reactor (2) to be composed of several rooms and the raw material undergoing pyrolysis is moved to the next room naturally. Device. The method of claim 1, Apparatus for producing a continuous polyolefin wax characterized in that a device capable of adding nitrogen or a solvent is attached to the lower end of the horizontal pyrolysis reactor (2) to remove the wax of low molecular weight by adding a solvent. Apparatus for producing polyolefin wax using pyrolysis reaction, In order to construct a device which simultaneously processes the pyrolysis reaction and the molecular weight distribution control reaction, Melting the raw material in the raw material conveying extruder (1) and then transferring the raw material to the pyrolysis reactor (2); The pyrolysis takes place in the reactor divided by the partition (6) and moves naturally under normal pressure through the open space at the top to the next room, Equipped with a solvent injection device (7) at the end of the reactor and the solvent is dissolved in a low molecular weight wax and collected in a condensation tank (4) of the volatile material, characterized in that the continuous molecular weight distribution control Method for producing a formula polyolefin wax.