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A still or process column in which blown or oxidized asphalt is made.

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Pump used to circulate process liquid out of and back into a process system, as in the circulation of distillation column bottoms through an external heater, or the circulation of storage tank bottoms to mix tank contents.


The process of removing asphalt from petroleum fractions.


Fluid system in which the process fluid is taken from and pumped back into the system, as in the circulation of distillation column bottoms through an external heater.


Process in which a continuous liquid-mixture feed stream is partly vaporized in a column or vessel, with continuous withdrawal of vapor and liquid portions, the vapor and liquid in equilibrium. Also known as continuous equilibrium vaporization; equilibrium distillation; flash distillation; simple continuous distillation.


Distillation column in which vapor-liquid contact is provided by perforated plates instead of bubble-cap trays.


  1. Application of voltage to an electrolytic capacitor, electrolytic rectifier, or semiconductor device to produce a desired permanent change in electrical characteristics as a part of the manufacturing process. 2. A process for shaping or molding sheets, rods, or other pieces of hot glass, ceramic ware, plastic, or metal by the application of pressure.


An oil refining process in which the gas-oil is cracked by a catalyst bed fluidized by using oil vapors.


Any gas that contains a significant amount of constituents that may form acids when mixed with water. An example is the acid gas, consisting largely of hydrogen sulphide and carbon dioxide, created in the process of sweetening natural gas.


  1. An instrument used to measure continuously or at intervals a condition that must be kept within prescribed limits, such as radioactivity at some point in a nuclear reactor, a variable quantity in an automatic process control system, the transmissions in a communication channel or bank, or the position of an aircraft in flight. 2. To use meters or special techniques to measure such a condition. 3. A person who watches a monitor.


In plant or process operations, the actual time that a unit is operating and producing product.

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