Consider steady-state models for process control

Article Abstract:

Steady-state models can be just as good as dynamic models in controlling chemical process systems. These models are preferred for these systems because of their approximately-first-order-plus-deadtime dynamic behavior and their nonlinear and nonstationary process behavior. They can be used in process-based-model control for improving process control and providing other significant benefits. The implementation of the multivariable controller also becomes simpler and follows standard industrial practice for tuning controllers.

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New catalysis for polyol production

Article Abstract:

Lyondell Chemical Co is one of the recipients of the 1999 Kirkpatrick Chemical Engineering Achievement Awards. The Houston, TX-based chemical company is recognized for developing a more cost-effective and efficient system of manufacturing polyether polyols. Lyondell's process employs a double-metal-cyanide catalyst that features low catalysts cost, ease of catalyst removal and ability to use a low-molecular-weight starter.

All Other Basic Organic Chemical Manufacturing, Polyhydric Alcohols & Ethers

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Prevent pollution in equipment and parts cleaning operations

Article Abstract:

Batch manufacturing operations typically require the cleaning of equipment and parts as an important preparatory step. Cleaning, however, usually uses organic solvents that are harmful to the environment. A Pollution- Prevention Continuum is proposed to eliminate the need to clean equipment, or, in cases where cleaning is necessary, to reduce the amount of organic solvents that is used.

Environmental Management

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