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The continuous stirred-tank reactor (CSTR), also known as vat-or backmix reactor, mixed flow reactor (MFR), or a continuous-flow stirred-tank reactor (CFSTR), is a common model for a chemical reactor in chemical engineering and environmental engineering. A CSTR often refers to a model used to estimate the key unit operation variables when using ...
For a continuous stirred-tank reactor (CSTR), the following relationship applies: [1] [2] = where: is the reactor volume; is the molar flow rate per unit time of the entering reactant A; is the conversion of reactant A
As can be seen, as the Damköhler number increases, the other term must decrease. The ensuing polynomial can be solved and the conversion for the rule of thumb Damköhler numbers found. Alternatively, one can graph the expressions and see where they intersect with the line given by the inverse Damköhler number to see the solution for conversion.
English: The non-ideal residence time distribution (RTD) curve that would be produced by a pulse experiment on a mixed-flow (CSTR) reactor with a dead volume. Date July 2008
English: A typical residence time distribution (RTD) curve that would be produced by a pulse experiment on a mixed-flow (CSTR) reactor. The shape is approximately exponential, but there is an initial lag due to the reality of physical mixing vs. an ideal CSTR.
The concept of residence time originated in models of chemical reactors. The first such model was an axial dispersion model by Irving Langmuir in 1908. This received little attention for 45 years; other models were developed such as the plug flow reactor model and the continuous stirred-tank reactor, and the concept of a washout function (representing the response to a sudden change in the ...
Simulated line graph of two sets of composition of two substances (Ca and Cb) obtained using attainable region theory. Desired optimal region circled. Attainable region (AR) theory is a branch of chemical engineering , specifically chemical reaction engineering , that uses geometric and mathematical optimization concepts to assist in the design ...
Each plug of differential volume is considered as a separate entity, effectively an infinitesimally small continuous stirred tank reactor, limiting to zero volume. As it flows down the tubular PFR, the residence time ( τ {\displaystyle \tau } ) of the plug is a function of its position in the reactor.