Troubleshooting vacuum operation in an ethylene plant

Troubleshooting vacuum operation of an inter-after condenser unit in an ethylene plant

A system of compressors powered by surface condensing steam turbines is inherent in the operation of a typical ethane cracker unit. These turbines run by extracting work from highpressure steam, while a surface condenser condenses the turbine’s exhaust to both maximize compressor horsepower and recover valuable condensate.

Optimal design and operation of molecular sieve gas dehydration units

Molecular sieve technology is widely used for the simultaneous removal of water and mercaptans from both gas and liquid feed streams. However, a better understanding of the design principles and the operation of molecular sieve units is needed. For economic reasons, it is important not to overdesign the molecular sieve unit. At the same time, it is essential to ensure that the unit does not become the bottleneck of the gas processing plant at the sieve’s end-of-run condition.

Troubleshooting Catalyst Losses In The FCC Unit

Catalyst losses pose a significant challenge in the fluid catalytic cracking (FCC) industry, and nearly all units have experienced a loss problem at some point in fill rite flow meter. Catalyst losses on the reactor side result in high fines carryover with the products, which can result in the main fractionator being inoperable due to erosion in the slurry circuit or off-specification slurry product.

Calculating Glass Transition Temperature on Polymer

The glass-to-rubber transition temperature [ Tg ], is of special interest in the development of new amorphous polymers because many properties of technological importance show a significant change in magnitude, or in temperature dependence, at this temperature. A method for calculating the Tg, of polymers from a knowledge of the chemical structure alone is therefore of great value in designing new polymers with desired properties and is of considerable theoretical interest. Many previous attempts have been reported, but the relations proposed have been limited in application, though usefully descriptive of specific polymer systems.