Low-viscosity liquid sulfur via polysulfide additives
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Solution Overview
Problem
The high viscosity of liquid sulfur between 150° C. and 300° C. poses significant challenges in industrial processes, storage, transportation, and equipment corrosion, with existing solutions like hydrogen sulfide being toxic and corrosive.
Innovation Solution
The addition of dialkyl monosulfides, disulfides, and polysulfides, such as dimethyl sulfide and diethyl sulfide, to liquid sulfur reduces viscosity effectively without the toxicity and corrosion issues associated with hydrogen sulfide, maintaining viscosity below 5000 mPa·s.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydrogen sulfide is added to liquid sulfur to reduce viscosity, then viscosity is reduced, but toxicity and corrosion increase
Solution Approach 1:
The patent introduces polysulfides as an intermediary substance that mediates between the need for viscosity reduction and the requirement to avoid toxicity. Polysulfides act as a safe alternative to hydrogen sulfide, achieving the same viscosity-reducing effect without the harmful side effects. The polysulfide molecules interact with liquid sulfur to reduce viscosity while maintaining system safety.
Solution Approach 2:
The patent changes the chemical parameter of the additive from toxic hydrogen sulfide to non-toxic polysulfides. This parameter change maintains the functional effect (viscosity reduction) while eliminating the harmful properties (toxicity and corrosion). The polysulfides modify the physical-chemical parameters of the sulfur system to achieve desired flow properties without introducing harmful factors.
2Force
If organohalogen derivatives are used to reduce sulfur viscosity, then viscosity is reduced, but corrosion and toxicity worsen
Solution Approach 1:
The patent replaces expensive and harmful organohalogen derivatives with simpler, non-toxic polysulfide compounds. The polysulfides serve as a safer, more environmentally friendly alternative that achieves the same viscosity modification without generating harmful byproducts or requiring complex corrosion protection systems.
Solution Approach 2:
The patent converts the potentially harmful interaction between additives and sulfur into a beneficial process. Instead of using substances that cause corrosion and toxicity, polysulfides create a synergistic effect with liquid sulfur that reduces viscosity while enhancing system safety and stability. The chemical interaction that could have been harmful is transformed into a beneficial viscosity-modification mechanism.
3Force
If temperature is increased to reduce sulfur viscosity, then viscosity decreases at high temperature, but viscosity increases significantly between 150-300°C
Solution Approach 1:
The patent applies preliminary action by adding polysulfides to liquid sulfur before processing operations. This pre-treatment modifies the viscosity characteristics of sulfur in advance, ensuring consistent flow properties across the operating temperature range without requiring precise temperature control during subsequent operations. The polysulfides prepare the sulfur system to maintain acceptable viscosity regardless of temperature fluctuations.
Solution Approach 2:
The patent introduces dynamic adaptability to the sulfur system through polysulfide additives. The modified sulfur composition dynamically adjusts its viscosity response to temperature changes, maintaining more stable flow characteristics across the 150-300°C range compared to pure sulfur. The polysulfides create a more flexible viscosity-temperature relationship that better accommodates operational variations.
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 approach significantly reduces the viscosity of liquid sulfur, enhancing its usability and safety in industrial applications by avoiding the use of toxic additives and corrosion-causing halogen compounds.
Implementation Method 1
The addition of dialkyl monosulfides, disulfides, and polysulfides, such as dimethyl sulfide and diethyl sulfide, to liquid sulfur reduces viscosity effectively
Data Source
AI summary
The invention relates to the use of at least one compound of formula (1):R—Sn—R′ (1)wherein R and R′ are each a hydrocarbon radical containing between 1 and 12 carbon atoms and n is a whole number between 1 and 8, for maintaining the viscosity of liquid sulfur at a value lower than 60,000 mPa·s, preferably lower than 30,000 mPa·s, especially preferably lower than 10,000 mPa·s. The invention also relates to a method for preparing low-viscosity liquid sulfur and to liquid sulfur compositions comprising at least one compound of formula (1).