Reactors polyethylene

Union Carbide Corp. also uses a siUca-supported chromium catalyst in their extremely low cost Unipol gas-phase linear low density ethylene copolymer process, which revolutionized the industry when it was introduced in 1977 (86—88). The productivity of this catalyst is 10 —10 kg polymer/kg transition metal contained in the catalyst. By 1990, the capacity of Unipol linear low density polyethylene reactors was sufficient to supply 25% of the world s total demand for polyethylene. 

The computer model consists of the numerical integration of a set of differential equations which conceptualizes the high-pressure polyethylene reactor. A Runge-Kutta technique is used for integration with the use of an automatically adjusted integration step size. The equations used for the computer model are shown in Appendix A. 

Example 4 Design a flat, perforated-plate grid for the polyethylene reactor schematically shown in Fig. 11, and calculate the gas j et penetration depth. Use a triangular pitch. System parameters are ... 

Corrosion control work completed around Polyethylene Reactors. (Maintenance records)... 

AM. Service contractor enters area to calibrate equipment in the Polyethylene Reactor No. 1 instrument house. (Interview)... 

Energy balance for a bursting polyethylene reactor during ethylene decomposition. Pressure 200 MPa volume 0.5 m3 [20] ... 

Schematic diagram for the polyethylene reactor model Figure 7.23...

Fig. 5 Autoclave and tubular high pressure polyethylene reactors...

The release of hydrocarbons from the polyethylene reactor occurred as a result of a violation of the procedures that are designed to provide three levels of protection.. . . The investigation does not speculate on who violated the procedure and for what reason.. . . The magnitude of the damage at the site and the lack of eyewitness information prevented the company from making such conclusions.. . . ... 

The release occurred during maintenance operations on a polyethylene reactor. Two of the six workers on the maintenance crews in the immediate vicinity of the reactor leg where the release occurred were killed, together with 21 other employees of the facility. Debris from the plant was found six miles from the explosion site. Structural steel beams were twisted like pretzels by the... 

A similar technique is applied to low-density polyethylene reactors. Some of these systems operate in cooled tubular reactors at a very high pressure. Since the reactor has a thick tube wall, the temperature response to changes in the coolant is slow. Instead, the reaction rate (and thereby temperature.) is controlled by injecting initiator at select places along the length of the reactor tube (see Fig. 4.28). 

The release of hydrocarbons from the polyethylene reactor occurred as a result of a violation of the procedures that are designed to provide three levels ofprotection. 

Podbielniak extractor. 478. 484. 487 Poiseuille equation, 94 Polyethylene reactor, 573, 574 Polytropic head, 156 Positive displacement pumps... 

Kolhapure and Fox, R. (1999), CFD analysis of micromixing effects on polymerization in tubular low-density polyethylene reactors, Chem. Eng. Sci., 54, 3233-3242. 

Thies, J. AIChE Symp. Modeling High Pressure Polyethylene Reactors,... 

Figure 3.18 Polyethylene reactors (a) autoclave reactor, (b) tubular reactor Short chain branching ...

October 23rd, 1989 Pasadena, U.S.A Explosion of a cloud of isobutene, ethylene, hexane, hydrogen released during maintenance of a polyethylene reactor 23 killed, 314 injured Housing damage in a radius of 8 km Earthquake intensity equivalent to 2,4 t TNT, magnitude 3,5 Richter... 

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