Energy-efficient Petrochemical Polimerization PP powder pelletizing line

Description of Process Characteristics

There are a large number of batch liquid phase bulk polymerization polypropylene production lines in China, referred to as small bulk polypropylene. The scale of production is small, and the production capacity ranges from several thousand tons to tens of thousands of tons. Because of its simple process, low investment in equipment, and quick results, it has developed rapidly.

However, the batch process polypropylene also has the following disadvantages: the production is powder molding, which is limited in the application range, and the antioxidant-free, powder is easily aged during storage. The performance of the product is unstable, and the performance indexes fluctuate greatly. At the same time, the ash content, volatiles and chlorine content are too large. Therefore, small bulk polypropylene is mainly used in low-end products, while the range of products is narrow, mostly is spinning, woven bags, packing belts, and small injection molding products.

Therefore, the above small bulk polypropylene powder needs to be modified and granulated to enhance its various qualities, and can be applied to middle and high-end products and some special materials. The main enhancements are as follows:

1. Before the granulation, the polypropylene powder is not homogenized by stirring, and the anti-oxidant, halogen absorbent and lubricant are added in the process of the granulation to make general-purpose granules, which improves the comprehensive quality, stability and application range of the polypropylene.

2. The granulation line is equipped with a vacuum degassing unit and a melt filter to effectively reduce its volatiles and ash.

3. Add special-purpose additives (such as nucleating agents, UV absorbers, slip agents, etc.) to make special materials to increase the added value of the products.

On the other hand, there is a huge demand for the special materials of homogenized polypropylene, copolymerized polypropylene and polyethylene in China, such as casting film PP, HDPE gas pipeline and low VOC resin etc. Petrochemical enterprises can meet part of the demand by modifying granulations on the basis of general brands.

Process flow of the production line

The GWHS-160/160 reciprocating extruder main unit in assembly:

The core extruder equipment includes parallel twin screw compounding extruder, reciprocating

compounding kneader, double rotor compounding extruder, SCP high viscosity self cleaning

reactor and large capacity devolatilizer, etc.

At the same time, based on the above main extruder, the design and manufacture of a

complete set of compounding pelletizing production line equipment and compounding

extrusion forming production line equipment can be realized. It is mainly used in the fields

of engineering plastics, modified plastics, wire and cable materials, rubber, packaging,

building medical chemical industry, chemical fiber textile, household appliance and other

industries (see the application case for details).

The existing factory area of the company is 46500 m2 (of which the parent company is

38000m2, and the subsidiary (Nanjing Cenmen) is 8500m2), The core parts and system

of the extruder are designed and manufactured by the company, such as barrel, screw,

gear box, etc. The company has advanced NC machining center, NC screw grinder,

CNC machine tool and other machining equipment. Equipped with Swiss imported

three-coordinate detector and Japanese imported spectral detector and other

advanced inspection and testing equipment. There are complete quality control means

and system from processing to testing, which fully ensure the stability and reliability of

product quality.

The extruders produced by Cenmen company are exported to nearly 40 countries, such as

Germany, Russia, belarus, Japan, Korea, Israel, Ukraine, magiddon, Iran, Thailand, Indonesia,

Brazil, India, Mexico, South Africa, etc.