ARPA 1

ARPA HD

Reaction Calorimeter ARPA 1: the chemical process safety

Beyond the stage laboratory, the development of the processes and marketing of the products more than is ever fixed today with very strong constraints in term of time. The reduction of the durations of development is essential indeed like a paramount competing criterion. It is thus from now on essential to obtain possible transfers in production fastest.

It is accordingly that ARPA  1 was designed  (AlgoChem Reactor Process Assisting).
Compact system, controlled by computer, it is able to agitate, heat and cool, introduce reagents, to distil, control the pH, the temperature of the reactional mass, the vacuum and the pressure… just like to carry out heat balances and to determine the critical parameters for the rise in scale of the processes of synthesis.

The collection of information on the chemical reactions on the scale of the laboratory provides precise data at the stages of "scale-up" which are facilitated and accelerated by it. The parameters of the tests and the experimental data are recorded every second what makes it possible the software of Post treatment to carry out an assessment matter and an assessment of heat on the whole of the course of the reaction. An editor of electronic book of laboratory allows the edition of a report/ratio of handling by incorporating the results of calorimetry. Good laboratory practice (BPL) becomes thus simple and automatic.

ARPA 1  is a calorimeter of reaction used in the laboratories implied in the optimization of the industrial processes or the safety of the chemical reactions.

The engine is automated and it takes again all the functions of model  ARLA 1. It includes moreover:
A system of calibration allowing the determination of the coefficient of exchange or the energy coefficient of covering (for a reaction to backward flow).
A condenser with measurement of the temperatures (in entry and exit) and of the flow.
A coolant `' last génération' ' especially developed for  ARPA 1.

With  ARPA 1, the measurement of the following parameters becomes simple and obvious:
Enthalpy of reaction
Heat-storage capacity
Heat flow
Coefficient of exchange compared to wet surface (A)
Adiabatic heating
Accumulation of energy

Calculations of calorimetry are carried out using the Software of PostTraitement de Données ARPA 1 which is easy to use. The user selects the file to be treated and with cursors, it marks the terminals of the graphs to be treated. Thus, it possible to have access to the values of calorimetry which once recorded, are built-in in ELAB notes

Control of the reaction:

The reaction is carried out exactly in the same way that with  ARLA 1 : It is possible to operate in manual mode as in automated mode.

In both cases, it is essential to gauge the system in order to obtain following measurements:
the coefficient of exchange U or the energy coefficient of covering of a reaction to backward flow
heat-storage capacity CP of the reactional medium
The editor of scenario of ARPA 1  included in more the possibility of making calibrations automated to determine the values of U and CP.

In the case of reaction to backward flow, a bill-poster allows to view and the water exit inlet temperatures of the condenser as well as the flow in the condenser.

Course of the reaction:
Calibration for the measurement of the Coefficient of exchange U
Measure heat-storage capacity of the reactional medium
Stability of the medium
Run reagent
Stability of the medium
Measure coefficient of exchange U
Measure heat-storage capacity of the reactional medium
End of the experimentation

Post treatment calorimetry module:

The data of the reaction are filed in the data base of handling.
Once the selected reaction, the computation software is simple to use. The determination of the values of calorimetry is carried out while placing cursors on the courbes(of power, temperature, of run of reagent…).

From the software, it is thus possible to realize:
The calculation of the coefficient of exchange
The calculation of the heat-storage capacity CP
The measurement of the heat flow Q
The measurement of the enthalpy of reaction  ΔH
Determination of accumulation at the end of the casting
The calculation of ΔTadiabatique
The calculation of the maximum temperature reached by racing of the desired reaction

For the method of calorimetry with backward flow, only the following parameters are given
Heat flow Q
Enthalpy of reaction  ΔH
Accumulation