Method for separating polyethylene byproduct polyethylene wax

A technology for polyethylene wax and by-products is applied in the field of polyethylene wax by-product polyethylene wax being dissolved and separated into products with different melting points, which can solve the problems of low price, unsatisfactory, poor product benefits, etc., and achieves widening application fields, The effect of increasing added value

Inactive Publication Date: 2012-04-11
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the melting point of polyethylene by-product low-melting-point polyethylene wax is generally 69-85°C. The application of polyethylene by-product low-melting-point polyethylene wax is only to make wax flakes after simple decolorization treatment for use as Low-end applications such a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1), in a device with a stirrer, add 100.0 g of polyethylene wax (produced by Jilin Petrochemical Company) with a melting point of 62.5-86.4 ° C and 175.0 g of xylene with a mass ratio of 1.75: 1 to polyethylene wax to dissolve, dissolve The temperature is 85°C, the dissolution time is 1h, and the liquid-solid mixed state material is obtained;

[0015] 2), the obtained liquid-solid mixed state material is separated by filtration, and the obtained solid material is a high-melting point polyethylene wax product, and its melting range is; 87.5-94.3 °C;

[0016] 3) Distill the filtered feed liquid under reduced pressure at a pressure of -0.1Mpa and a temperature of 70°C to obtain polyethylene wax with a low melting point and a melting range of 48.3-66.5°C; the solvent recovered through reduced-pressure distillation can be recycled use. The obtained polyethylene wax product was measured with an X-6 precision melting point analyzer produced by Beijing Saibaiao Technology Co.,...

Embodiment 2

[0018] The solvent described in step 1) is n-heptane, and the melting temperature is 90° C.; the melting range of the obtained high melting point polyethylene wax is 82.6-90.1° C.; the melting range of the low melting point polyethylene wax in step 2) is 45.3-63.8° C.; step 3) distillation temperature 80° C.; the rest are the same as in Example 1.

Embodiment 3

[0020] The solvent described in step 1) is a mixture of xylene and n-heptane with a mass ratio of 1:1, and the melting temperature is 85°C; the melting range of the obtained high melting point polyethylene wax is 88.4-94.2°C; in step 2) The melting range of the low melting point polyethylene wax is 46.2-51.1 ℃; step 3) temperature 75 ℃; all the other are the same as embodiment 1.

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Abstract

The invention provides a method for separating polyethylene byproduct polyethylene wax. In the method, a solvent is adopted to selectively dissolve components with a low melting point in the polyethylene wax, so that the separation between components with the low melting point and the components with a high melting point in the polyethylene wax is realized, and a polyethylene wax product with a high melting point and a polyethylene wax product with a low melting point are obtained. The melting point of the polyethylene wax with the high melting point is 82.6-96.3 DEG C, the polyethylene wax with the high melting point can be used for producing high-grade polishing wax for master batch, ink processing, automobiles and leather coats, and the price of the polyethylene wax with the high melting point per ton is increased by 3000-5000 RMB. The melting point of the polyethylene wax with the low melting point is 45.3-69.5 DEG C, and the product with the low melting point after being processed can be used for a phase-change capsule material and the cosmetics industry, so that the field of application of the polyethylene wax is widened, and the additive value of the product is increased; and in addition, the solvent which is recovered through depressurizing and distilling can be reused.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a method for dissolving and separating polyethylene wax, a by-product of polyethylene, into products with different melting points. technical background [0002] At present, the melting point of polyethylene by-product low-melting-point polyethylene wax is generally 69-85°C. The application of polyethylene by-product low-melting-point polyethylene wax is simply to make it into wax flakes after simple decolorization treatment for use as Low-end applications such as lubricants for plastic processing, capacitors, insulating agents and moisture-proof agents for transformer windings cannot meet the requirements of color masterbatches and polyethylene wax for ink processing, so the scope of use is narrow, the price is low, and the benefits of the product are poor. [1] . [0003] references: [0004] [1] "Petroleum Wax Production and Deep Processing", Zheng Lihui, Sheng Kuil...

Claims

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Application Information

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IPC IPC(8): C08L23/06
Inventor 张龙贾寅寅
Owner CHANGCHUN UNIV OF TECH
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