Production technology of polyethylene wax

Abstract

The invention belongs to the technical field of chemical production and in particular relates to a production technology of polyethylene wax. The technology comprises the following steps: classifyingwaste PE (Polyethylene) and carrying out washing and drying pre-treatment; uniformly feeding the pre-treated waste PE into a polyethylene cracking device through a full-automatic feeding device; meanwhile, adding a catalyst Al-MCM-48, wherein the adding amount of the catalyst Al-MCM-48 is 0.1 percent of the weight of the waste PE; heating and stirring at the same time; after cracking reaction is finished, stopping heating; cooling the polyethylene wax generated by the reaction through a continuous discharging and cooling system and conveying the polyethylene wax into a material distribution device and directly granulating; then cooling to obtain spherical or sheet-shaped polyethylene wax. The PE which does not react completely is separated through a separator and continually reacts in thepolyethylene cracking device; a few of low-boiling-point substances generated in a reaction process are cooled and recycled through a low-boiling-point substance condensation and recycling system; ina material distribution and granulation process, less generated smoke enters the low-boiling-point substance condensation and recycling system through a smoke recycling pipeline and is cooled and recycled. The technology is used for producing the polyethylene wax in batches; the technology is simple and the manufacturing cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of chemical production, in particular to a polyethylene wax production process. Background technique [0002] Polyethylene wax is a polyolefin synthetic wax. Its appearance is white or light yellow block, flake or powder solid. The relative molecular mass is 1000-4000. It has low toxicity, non-corrosiveness, high hardness and high softening point. , low melt viscosity, wear resistance, heat resistance, good lubricity, dispersion and fluidity, etc., can effectively improve the processing efficiency of PVC pipes, profiled materials, films, cables and other plastics and rubbers, and have broad prospects for development and utilization. At present, the production of polyethylene wax is mainly obtained through three methods: ethylene monomer oligomerization, polymer degradation (polyethylene cracking) and by-products in the polyethylene synthesis process. It is an industry with great market potential to prepare ...

AI Technical Summary

Problems solved by technology

[0004] In the traditional production of polyethylene wax, reactor heating cracking process and extrusion cracking process are usually used. This process has the following disadvantages: (1) Due to the fact that the raw material is mechanically stirred during the cracking reaction and the torque of the screw is very large , not only requires a lot of energy consumption, but also causes the stirring device or extrusion device to be easily damaged. The output of 100kg / h requires a motor of more than 50kW to drive

(2) The heating device is around the pipe wall, the heat utilization rate is low and the loss is large

(3) Reactor cracking process is intermittent and cannot be produced continuously

(4) The extrusion cracking process has strict requirements on the geometric shape of the raw materials, which must be broken evenly before they can be used, and the cost of each ton of raw materials needs to be increased by 200 yuan

And energy consumption is big, output is low, (5) safety is poor, wax production rate is low, the rate of wax formation is below 85%, labor intensity of workers is high, environmental protection is poor etc.

Images