Browse Prior Art Database

Adiabatic Pilot Reactor to study the shut down and runaway behavior of high pressure reactions

IP.com Disclosure Number: IPCOM000201764D
Publication Date: 2010-Nov-22
Document File: 2 page(s) / 132K

Publishing Venue

The IP.com Prior Art Database

Abstract

An Adiabatic Pilot Reactor is developed to study the shut down and runaway behavior of exothermal high pressure reactions.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 51% of the total text.

Page 01 of 2

Adiabatic Pilot Reactor to study the shut down and runaway behavior of high pressure reactions

ABSTRACT

An Adiabatic Pilot Reactor is developed to study the shut down and runaway behavior of exothermal high pressure reactions.

DESCRIPTION

An Adiabatic Pilot Reactor (APR) is developed to study the shut down and runaway behavior of exothermal high pressure reactions.

By a shut down of a chemical production reactor runaway reactions can occur. Thermal analysis techniques with a classical calorimeter are established safety tools to identify chemical runaway reactions. However, to study the dynamic behavior of runaway reactions these tools are unsatisfactory, e.g. if the process takes place in a (multi)tubular reactor, such as a fixed-bed reactor. In case of high pressure reactions, the chemical composition in technical reactors - e.g. molar ratio and concentration profile of all reaction substances - are often not exactly known and can consequently not be simulated in a calorimeter.

To prove the influence of all reaction parameters on the runaway behavior of high pressure reactions an appropriate lab reactor tool is needed. Nevertheless, a normal lab- scale reactor can not be used. Due to its big surface to volume ratio, a lab reactor loses a lot of heat. Therefore the temperature profile is almost isothermal instead of adiabatic. After reactor shut down, this difference in heat loss causes a drastic change in reactor behavior. This problem could be overcome with the development of the Adiabatic Pilot Reactor. Due to its very small wall thickness, the heat flow from reactor content to reactor wall material is drastically reduced. With the surrounding insulation jacket and outside heating element, heat losses are further minimized. The thin reactor tube is placed in a second larger pressure tube to ensure the reactor content would be contained, in case the inner reactor tube would break during a runaway experiment. Validation of the Adiabatic Pilot Reactor showed that normal production and shut down behavior of industrial (multi)tubular reactors (e.g. fixed-bed reactors) can be simulated almost perfectly.

The Adiabatic Pilot Reactor includes the following equipment:
(1) inner reactor tube
(2) outer reactor tube
(3) insulation jacket between inner and outer reactor tube
(4) at least one reactor feed at the inner reactor tube to supply the reactants
(5) at least one reactor d...