Reactor Feed Pipe Cooling to Prevent Saccharide Degradation
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Solution Overview
Problem
The catalytic conversion of saccharides in reactor feed pipes is hindered by degradation at high temperatures, leading to fouling and blocking, resulting in increased running costs and reduced productivity due to reactor shut-downs for cleaning and replacement.
Innovation Solution
Maintaining the saccharide-containing feedstock in the feed pipe below its degradation temperature and cooling a section of the reactor wall at the point of entry to prevent thermal degradation, using cooling liquids or low-pressure steam to manage temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the feed pipe temperature is increased to match the reactor temperature, then the catalytic conversion efficiency is improved, but saccharide degradation and fouling occur at the reactor entry point
Solution Approach 1:
The reactor wall is divided into two temperature zones: a cooled section at the feed pipe entry point and a hot bulk reactor zone. This local temperature differentiation allows the feed to be maintained at lower temperature (preventing degradation) while the bulk reactor operates at high temperature (ensuring conversion efficiency).
Solution Approach 2:
The reactor system is segmented into a feed introduction zone with active cooling and a bulk reaction zone at high temperature. This segmentation allows independent temperature control of different functional zones, resolving the contradiction between maintaining low feed temperature and achieving high reaction temperature.
2Object-affected harmful factors
If the feed pipe temperature is maintained below degradation temperature, then saccharide degradation is reduced, but the temperature difference between feed and reactor contents increases
Solution Approach 1:
A cooling medium (liquid or gas) is introduced as an intermediary between the feed pipe and the hot reactor bulk. This intermediary absorbs excess heat at the entry point, preventing direct thermal exposure of the feed to high temperatures while allowing the bulk reactor to maintain high temperature for efficient catalysis.
3Reliability
If reactor shut-downs occur for cleaning and replacement of feed pipes, then fouling is removed, but running costs increase and productivity decreases
Solution Approach 1:
Cooling action is applied preliminarily at the feed pipe entry point before the feed enters the hot reactor zone. This preliminary temperature control prevents degradation and fouling from occurring in the first place, eliminating the need for subsequent cleaning operations and associated productivity losses.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly reduces saccharide degradation at the reactor entry point, minimizing fouling and blocking, thereby reducing downtime and maintenance costs while maintaining reactor efficiency.
Implementation Method 1
a section of the wall of the reactor at the point where the feed pipe enters the reactor is cooled using a cooling liquid, by air cooling
Implementation Method 2
by using the heat to evaporate water in order to provide low pressure steam
Data Source
Figure 1
AI summary
The invention provides a process for the catalytic conversion of a saccharide-containing feedstock in a reactor, wherein saccharide-containing feedstock is provided to the reactor as a feed stream through a feed pipe and is contacted with a catalyst system in the reactor, wherein the saccharide-containing feedstock in the feed pipe is maintained at a temperature below the degradation temperature of the saccharide contained therein and a section of the wall of the reactor at the point where the feed pipe enters the reactor is cooled to a temperature below the temperature of the bulk of the reactor and the reactor contents.