Rubber Pretreatment for Pyrolysis Odor Reduction
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Solution Overview
Problem
Rubber pyrolysis products often contain sulfur and nitrogen residues that deteriorate the quality and odor of the oil, causing environmental and working environment issues during the pyrolysis process.
Innovation Solution
A pretreatment method involving holding sulfur crosslinked rubber under specific temperature and pressure conditions for 10 minutes to 60 minutes, followed by pyrolysis at 350°C or higher, effectively reduces sulfur and nitrogen content and odor in the pyrolysis products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rubber articles are pyrolyzed directly without pretreatment, then pyrolysis products can be obtained quickly, but sulfur and nitrogen residues deteriorate the quality and cause strong odors in the pyrolysis oil
Solution Approach 1:
The patent applies preliminary action by performing a pretreatment step before pyrolysis. The rubber articles are held at 100-200°C for 10-60 minutes under reduced pressure (1-100 hPa) to remove volatile components including sulfur and nitrogen compounds. This preliminary removal of harmful substances before the main pyrolysis process reduces odor and improves pyrolysis oil quality while maintaining efficient pyrolysis
2Object-affected harmful factors
If holding time is extended to 60 minutes or more, then sulfur and nitrogen content in pyrolysis products is reduced, but processing time increases
Solution Approach 1:
The patent applies parameter changes by optimizing the holding conditions within specific ranges: temperature of 100-200°C, pressure of 1-100 hPa, and time of 10-60 minutes. By adjusting these parameters, the process achieves effective removal of sulfur and nitrogen compounds (reducing their content to 0.70 or less and 0.80 or less respectively) while controlling the pretreatment time to be practical for industrial application
3Object-affected harmful factors
If holding temperature is increased above 200°C, then volatilization of sulfur and nitrogen compounds is enhanced, but rubber decomposition may occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the holding temperature within the range of 100-200°C. This temperature range is optimized to enhance the volatilization of sulfur and nitrogen compounds while maintaining the stability of the rubber composition and avoiding premature decomposition. The temperature parameter is kept below the decomposition point of rubber to preserve material integrity
4Ease of manufacture
If pressure is maintained at atmospheric pressure, then processing is simple, but sulfur and nitrogen compounds do not volatilize effectively
Solution Approach 1:
The patent applies parameter changes by controlling the pressure to be between 1-100 hPa (reduced pressure) during the holding step. This pressure reduction enhances the volatilization and removal efficiency of sulfur and nitrogen compounds from the rubber articles. The pressure parameter is specifically adjusted to create favorable conditions for compound removal while remaining practical for industrial implementation
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
The method significantly reduces sulfur and nitrogen compounds in pyrolysis oil by 30% or more, improving the odor and quality of the pyrolysis products, with a reduction rate of sulfur-containing compounds to 0.70 or less and nitrogen-containing compounds to 0.80 or less.
Implementation Method 1
the sulfur crosslinked rubber is held for 10 minutes or longer under conditions satisfying the following formulas (1) and (2) to obtain pretreated rubber... effectively reduce the sulfur and/or nitrogen content in the resulting pyrolysis product, which is particularly easy to volatilize
Implementation Method 2
a pyrolysis process in which the pretreated rubber obtained in the pretreatment process is pyrolyzed at 350° C. or higher to obtain a pyrolysis product
Data Source
AI summary
Provided is a pretreatment method for rubber, which, in the pyrolysis treatment for used rubber, can reduce the odor during pyrolysis, effectively reduce the sulfur and/or nitrogen content in the resulting pyrolysis products, which is particularly easy to volatilize, and further reduce the odor of the oil obtained from the pyrolysis. This pretreatment method for rubber is a pretreatment method for rubber, in which sulfur crosslinked rubber is pretreated prior to pyrolysis treatment, characterized in that: the method includes a holding process in which the sulfur crosslinked rubber is held for minutes or longer under conditions satisfying the prescribed formulas (1) and (2) to obtain pretreated rubber; and that in the holding process, when the ambient pressure P is atmospheric pressure, the holding is performed under an air flow of inert gas.