Hydrocarbon Cracking Temperature Control to Limit Soot
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for processing used plastics and polyolefins to recover hydrocarbons often produce excessive soot and heavy hydrocarbons, which are less desirable, while aiming to produce light hydrocarbons with shorter chain lengths.
Innovation Solution
A method involving heating long-chained hydrocarbons to a cracking temperature and maintaining the temperature within 50°C of this point, adjusting pressure to enhance heat conductivity, and using additives like butylated hydroxytoluene (BHT) and zeolite to prevent recombination of cracked chains, while implementing a feedback loop for incomplete cracking and separating coke from the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If used plastics are processed by known cracking methods to recover hydrocarbons, then hydrocarbon recovery is achieved, but excessive soot and heavy hydrocarbons are produced which are less desirable
Solution Approach 1:
The patent applies parameter changes by precisely controlling the temperature parameter during cracking. The temperature is maintained within a specific range (400-450°C) and the heating rate is controlled to prevent excessive temperature excursions. This parameter optimization ensures complete cracking of long-chain hydrocarbons while minimizing the formation of soot and heavy hydrocarbons, thus resolving the contradiction between hydrocarbon recovery and harmful byproduct formation.
Solution Approach 2:
The patent implements periodic action through a two-stage cracking process. The first stage involves initial cracking at controlled temperature, followed by a second stage that continues cracking until completion. This periodic, staged approach allows thorough conversion of long-chain hydrocarbons to desired products while preventing premature termination that would leave unwanted heavy hydrocarbons and soot, thereby resolving the contradiction.
2Productivity
If heating temperature is increased to improve cracking efficiency, then cracking rate increases, but formation of solid carbons and heavy hydrocarbons increases
Solution Approach 1:
The patent optimizes the temperature parameter by establishing a specific operating range (400-450°C) and controlling the heating rate. This parameter control ensures that cracking proceeds at sufficient speed for high productivity while preventing temperature excursions that would lead to excessive soot and heavy hydrocarbon formation. The balanced temperature management resolves the contradiction between cracking rate and harmful byproduct formation.
Solution Approach 2:
The patent ensures continuous cracking action by maintaining steady temperature within the optimal range and using a second cracking stage to complete the process. This continuous, controlled cracking prevents interruption or premature termination that would leave uncracked heavy hydrocarbons and soot, while maintaining high productivity through sustained reaction conditions. The continuous action resolves the contradiction between cracking efficiency and byproduct formation.
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
This method significantly reduces the formation of solid carbons and heavy hydrocarbons, increasing the yield of usable light hydrocarbons with shorter chain lengths, thereby improving the efficiency of hydrocarbon recovery from plastic waste.
Implementation Method 1
heating a specific volume of the material containing long-chained hydrocarbons to a cracking temperature
Implementation Method 2
at which cracking temperature the chains of hydrocarbons in the material start cracking into shorter chains
Implementation Method 3
adjusting a pressure of the specific volume of the material containing long-chained hydrocarbons to limit a gas content
Implementation Method 4
Higher pressures increase a boiling point of liquids. Accordingly, by increasing the pressure, heat conductivity inside the substance is increased such that heat transfer into the substance is improved
Implementation Method 5
the additive preferably being an antioxidant, the additive particularly provided to donate a hydride to a chain end after cracking a long-chained polymer
Implementation Method 6
the additive particularly provided to donate a hydride to a chain end after cracking a long-chained polymer, the additive preferably containing butylated hydroxytoluene (BHT) and/or zeolite
Implementation Method 7
separating coke from the process
Implementation Method 8
separating coke from the process and increasing the yield of usable light hydrocarbons
Data Source
AI summary
A method and apparatus for breaking down long chained hydrocarbons from plastic-containing waste and organic liquids based on crude oil, comprising providing material containing long-chained hydrocarbons; heating a specific volume of the material containing long-chained hydrocarbons to a cracking temperature, at which cracking temperature the chains of hydrocarbons in the material start cracking into shorter chains; and for the specific volume having a temperature above the cracking temperature, exposing the specific volume to heat which is less than or equal to 50° C. above the temperature of the specific volume.