انواع تکنولوژی تولید پلی اتیلن پلی اتیلن

In the production of قالب گیری تزریقی parts, استفاده از مواد خام پلاستیکی اجتناب ناپذیر است. امروز فرآیند تولید pe را توضیح خواهیم داد, اصلی دنیا 11 types of polyethylene PE production technology

در حال حاضر, there are many companies with polyethylene technology in the world, شامل 7 شرکت هایی با فناوری LDPE, 10 شرکت هایی با فناوری LDPE و چگالی کامل, و 12 companies with HDPE technology. From the perspective of technological development, high-pressure production of LDPE is the most mature method in the production of PE resin. Both the kettle method and the tubular method have matured. در حال حاضر, these two production technologies coexist. Developed countries generally adopt the tubular production process. علاوه بر این, foreign companies generally use low-temperature high-activity catalysts to initiate polymerization systems, which can reduce the reaction temperature and pressure. The high-pressure production of LDPE will develop in the direction of large-scale and tubular production. The low-pressure production of HDPE and LLDPE mainly uses titanium and complex catalysts. Europe and Japan mostly use Ziegler-type titanium catalysts, while the United States mostly uses complex catalysts. در حال حاضر, there are 11 types of polyethylene production technologies that are mainly used in the world. A brief introduction is as follows:
(1) Basel company gas phase Spherilene process

The production of linear PE can range from very low density PE (ULDPE) to LLDPE, as well as HDPE. Pick

Ziegler-Natta type titanium-based catalyst and Spherilene gas phase process are used. In the presence of light inert hydrocarbons, the catalyst and feed are pre-polymerized in bulk first, and bulk polymerization occurs under mild conditions. The slurry enters the first gas phase reactor, uses the circulating gas loop cooler to dissipate heat, and then enters the two gas phase reactors. The density of the produced products ranges from ULDPE (less than 900kg/m3) to HDPE (greater than 960 kg/m3), and the melt flow rate (MFR) ranges from 0.01 به 100. Because of the use of two gas phase reactors, it can produce bimodal and special polymers. Things. Since the Spheri Lene process was introduced to the market in 1992, it now has a production capacity of 1.8 million tons per year. Six production units (1 in the United States, 2 in South Korea, 2 in Brazil, و 1 in India) have been put into operation, and another two (1 each in India and Iran) are under construction. The single-line production capacity can reach 100,000 tons per unit. One 300,000 tons per year. در حال حاضر, China does not have production facilities for this type of technology.
（2）Borealis Bastar Process

Beixing PE process can produce bimodal and unimodal LLDPE, MDPE (medium density PE) and HDPE. use

Series loop, gas phase low pressure reactor. The density of PE is 918-970kg/m3, and the melt index is 0.1-100. Adopt Z-N catalyst or Ssc (single active site) catalyst.

The catalyst and propane diluent are mixed into the compact pre-polymerization reactor, and the co-catalyst,

Ethylene, comonomer and hydrogen. The pre-polymerized slurry enters the second larger slurry loop reactor and operates under supercritical conditions (75-100سی, 5. 5-6.5 MPa). Can produce bimodal products. The flashed polymer is further sent to the fluidized bed gas phase reactor without adding new catalysts, and homopolymers can be obtained. The gas phase reaction conditions are: 75-100سی, 2. 0MPa. The first set of industrial equipment was put into operation in Finland in 1995, and two production lines (450,000 tons/year bimodal products) built in Abu Dhabi were put into operation in the second half of 2001. The fifth set of 250,000 tons/year (the second set of bimodal) was also built in China Shanghai Petrochemical Company, becoming China’s largest PE device. The maximum design capacity of this single line of this process can reach 300,000 tons/year.
(3) BP’s gas phase Innovene process

It can produce LLDPE and HDPE products, using Z-N titanium-based, chromium-based or metallocene catalysts. Chrome

The chemical agent can produce products with a wide molecular weight distribution, and the Ziegler-Natta (Z-N) catalyst can produce products with a narrow molecular weight distribution. The operating conditions of the bed reactor are relaxed, at 75-100C and 2.0MPa. Butene or hexene can be used as a comonomer. 30 sets of production lines have been put into operation, design or construction. The capacity ranges from 50,000 به 350,000 tons per year.

Technip cooperates with BP in Europe, the former Soviet Union, South America, China and Malaysia
Support BP’s Innovene process for producing polyethylene. BP’s Innovene PE capacity has now exceeded 8 million tons per year, including PE devices in Bandar Iman in Iran, Grangermus in Scotland, Merak in Indonesia, and Keltih in Malaysia. The second expansion of the LLDPE/HDPE plant of China’s Dushanzi Petrochemical Company also adopted the Innovene process, increasing from 120,000 tons/year to 200,000 tons/year. SECCO’s new 600,000 tons of polyethylene will use this technology.
(4) ExxonMobil’s tubular and kettle reaction process

High-pressure free radical process is used to produce LDPE homopolymer and EVA (ethylene vinyl acetate) copolymer.

Large-scale tubular reactors (capacity of 130 به 350,000 tons/year) and stirred tank reactors (capacity of about 100,000 tons/year) are used. The operating pressure of the tubular reactor is as high as 300MPa, and the tank reactor is lower than 200MPa. The advantage of the high-pressure process is to shorten the residence time, and the same reactor can be switched from producing homopolymers to copolymers. The density of homopolymer polymer is 912-935 kg/m3, and the melt index is 0.2-150. The vinyl acetate content can be as high as 30%. The material consumption and energy consumption per ton of polymer production are: 1.008 tons of ethylene, 800kwh of electricity, 0.35t of steam, and 5m3 of nitrogen. 23 sets of high-pressure process reactors have been put into operation, with a production capacity of 1.7 million tons per year. Production of homopolymers and various copolymers. در حال حاضر, Yanshan’s newly built 200,000-ton/year LDPE plant adopts the company’s tube method technology.
（5) Mitsui Chemicals low-pressure slurry Cx process

It can produce HDPE and MDPE, using the low-pressure slurry method CX process. Can produce bimodal molecular weight distribution

The product. Ethylene, hydrogen, comonomer and ultra-high activity catalyst enter the reactor, and polymerization reaction occurs in the slurry state. The polymer property automatic control system can effectively control the product quality, and the ultra-high activity catalyst does not need to be removed from the product. 90% of the solvent separated from the slurry can be directly recycled to the reactor without any treatment. It can produce products with narrow or wide molecular weight distribution with a density of 930-970 kg/m3 and a melt index of 0.01-50. The material consumption and energy consumption per ton of product produced are: 1010 kg of ethylene and comonomers, 305 kWh of electricity, 340 kg of steam, 190 tons of cooling water, و 30 m3 of nitrogen. 35 production lines have been put into operation or under construction, with a total capacity of 3.6 million tons per year. در حال حاضر, domestic enterprises using this technology mainly include the 220,000-ton plant in Daqing, the 140,000-ton plant in Yangtze and Yanshan, and the 70,000-ton plant in Lanzhou.
(6) Chevron-Philips double loop reactor LPE process

Phillips Petroleum Company LPE process is used to produce linear polyethylene (LPE). Highly active catalyst

The chemical agent is polymerized in the loop reactor and the isobutane slurry. Product melt index and molecular weight distribution can be adjusted and controlled by catalyst, operating conditions and hydrogen. The comonomer can be butene-1, hexene-1, octene-1 and the like. The high activity catalyst makes it unnecessary to remove the catalyst, and no paraffin or other by-products are formed during polymerization, which greatly reduces the environmental pollution. Ethylene, isobutane, comonomer and catalyst continuously enter the loop reactor and react at a temperature lower than 100C and about 4.0 MPa, and the residence time is about 1 hour. The single-pass conversion rate of ethylene exceeds 97%. The material consumption and energy consumption per ton of product produced are: 1.007 tons of ethylene, US$2-10 for catalysts and chemicals (for different products), 350 kWh of electricity, 0.25 ton of steam, 185 ton of cooling water, و 30 m3 of nitrogen. 82 production lines have been put into operation and construction, accounting for 34% of the world’s PE capacity. The 135,000-ton plant of Shanghai Jinfei Company uses this technology. Maoming’s newly built 350,000-ton/year new device may also adopt this technology.
(7) Univation technology company low pressure gas phase Unipol process

LLDPE-HDPE is produced by the low-pressure, air-pressure Unipol PE process. Using slurry catalyst and gas

Phase, fluidized bed reactor. With conventional and metallocene catalysts, no catalyst removal step is required. Investment and operating costs are lower, and there is less pollution to the environment. Ethylene, comonomer and catalyst enter the fluidized bed reactor, the operating conditions are about 100C and 2.5MPa. The product density is 915-970kg/m3, and the melt index is 0.1-200. According to the type of catalyst, narrow or broad molecular weight distribution can be adjusted. 89 production lines have been put into operation or construction. The single line capacity can be 410,000 به 450,000 tons per year. در حال حاضر, there are many domestic devices using this technology, mainly Maoming, Jihua, Yangtze, Tianjin, Zhongyuan, Guangzhou, Daqing, Qilu, و غیره.

(8) Stamicarbon 4a COMPACT IZ This process uses advanced Z-N catalysts and uses COMPACT Solution technology to produce a density of

900-970kg/m3 of PE. A stirred tank reactor is used, and the polymerization temperature is 200C. Hydrogen is used to control the molecular weight of the polymer. No catalyst removal step is required. The material consumption and energy consumption per ton of product are: ethylene and comonomer 1.016t, electricity 500kwh, steam 400kg, cooling water 230m3, low pressure steam (خروجی) 330کیلوگرم. There are 5 sets of devices in operation, with a total capacity of 650,000 tons/ year.
(9) Basel Polyolefin Company Hostalen Process

The hostalen process of stirred tank is used to produce HDPE. Use two reactors in parallel or series

Slurry polymerization. The material consumption and energy consumption per ton of product produced are: 1.015 t of ethylene and comonomers, 400 kg of steam, 350 kwh of electricity, و 165 m3 of cooling water. There are 31 production lines in operation or under design, with a production capacity of nearly 3.4 million tons per year. در حال حاضر, the domestic device adopting this technology is Liaohua Company, with a production capacity of only 40,000 tons. The current single-line maximum production capacity of this technology can reach 350,000 tons/year, and it can produce almost all products including Bifeng, among which its products such as film, hollow and pipe have a certain reputation in the world.