chemics 20.4

A Python package for chemical reactor engineering

Chemics

The Chemics package is a collection of Python functions for conducting calculations in the field of chemical and fluidization engineering. Source code for the package is available on GitHub and contributions from the community are encouraged.

Installation

The Anaconda or Miniconda distribution of Python is recommended for scientific computing. After setting up Python, the Chemics package can be downloaded and installed with the pip package manager:

pip install chemics

Usage

The example below imports the Chemics package then uses the rhog() function to calculate the density of a gas based on its molecular weight, pressure, and temperature.

import chemics as cm
cm.rhog(28, 101325, 773)    # returns 0.4414

The ut() function calculates the terminal velocity of a particle according to the Haider and Levenspiel 1989 paper as shown below.

import chemics as cm

# Parameters
dp = 0.00016    # particle diameter [m]
mu = 1.8e-5     # gas viscosity [kg/(m s)]
phi = 0.67      # particle sphericity [-]
rhog = 1.2      # gas density [kg/m^3]
rhos = 2600     # particle density [kg/m^3]

# Haider and Levenspiel terminal velocity [m/s]
# this assigns a value of 0.8857 to `ut_haider`
ut_haider = cm.ut_haider(dp, mu, phi, rhog, rhos)

Use the ChemicalEquation class to get properties of the reactants and products from a given chemical equation.

import chemics as cm

ce = cm.ChemicalEquation('2 HCl + 2 Na -> 2 NaCl + H2')

ce.balance
# returns True for balanced equation

ce.rct_properties
# returns a dataframe of the reactant properties
#                HCl        Na
# moles            2         2
# species        HCl        Na
# molwt       36.458     22.99
# mass        72.916     45.98
# molfrac        0.5       0.5
# massfrac  0.613275  0.386725

More examples are available in the chemics-examples repository.

Documentation

Documentation for the Chemics package is available at chemics.github.io.

Contributing

See the CONTRIBUTING.md document for guidelines on contributing to the Chemics package.

License

Chemics is available under the MIT License - see the LICENSE file for more information.