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JYA-56 ditert butyl polysulfide is the result of collaborative innovation by Dongying Junyuan Petroleum and holds several technology patents. It is a non-flammable liquid with a high flash point, robust safety features, and a more friendly odor.

JYA-56 ditert butyl polysulfide finds extensive use in hydrogenation catalyst sulfiding, sulfur supplementation, and sulfur injection across various domains: oil refining, petrochemicals, coal chemicals, waste mineral oil regeneration, hydrogenated vegetable oil, and fine chemicals.

Additionally, ditert butyl polysulfide  serves as a coking inhibitor in ethylene cracking furnaces, also known as Gas-Phase cracking furnace coking inhibitors.

As a new environmentally friendly and safe product, JYA-56 ditert butyl polysulfide stands out as an ideal green and reliable alternative to traditional dimethyl disulfide (DMDS) products.



Typical Specifications:

Technical Data of JYA-56 ditert butyl polysulfide

l  Product Code: JYA-56

l  Chemical Components: Di-Tert-Butyl PolySulfide

l  Appearance: Light yellow to dark brown liquid

l  Features: Environmentally and safer. Non-flammable, with friendly odor. Low toxicity.

l  Molecular Formula: C8H18Sx

l  CAS: 68937-96-2




Test Method

Flash Point (opening cup),


GB/T 3536


Dark Brown or Tan Liquid



Friendly odor



Insoluble in Water,
  Miscible in Alcohol, Ether


Density(20), g/cm3


GB/T 4472

Sulfur, %(wt)


GB/T 17040

Freezing Point


GB/T 510

Ash, %(wt)


GB/T 508

Kinematic Viscosity(40), mm2/s

To Be Reported

GB/T 265

Initial Thermal   Decomposition Temperature





Advantages of JYA-56 ditert butyl polysulfide:

Performance data-JYA 56 ditert butyl polysulfide vs DMDS

Typical Characteristics



Chemical Name

Dimethyl Disulfide

Di-tert-Butyl Polysulfide

Sulfur Content(%,wt)






Flash Point




Light yellow liquid

Dark brown liquid


Offensive odor

Friendly odor




Freezing point



Water Solubility







  1. Friendly Odor:

    • DMDS (dimethyl disulfide) has an extremely unpleasant odor.    

      Spills of  DMDS can be distressing to workers and surrounding communities.

    • In contrast, JYA-56 ditert butyl polysulfide  has a  milder and common smell for refineries. No need to worry about complaints  anymore.

  2. Flammability and Storage:

    • DMDS: Flammable with a low flash point (24°C),  requiring extra attention during use and storage.

    • JYA-56 ditert butyl polysulfide : Non-flammable with a flash point over 100°C. It  significantly reduces production, transportation, and storage risks. The  use of ordinary transport vehicles ensures practicality and also  eliminates the financial burden and alleviates safety concerns.

  3. Ease of Handling:

    • JYA-56 ditert butyl polysulfide  is low-risk and can be filled using a  portable low-pressure pump.

  4. Sulfurization Benefits:

    • JYA-56 ditert butyl polysulfide  can participate in sulfurization reactions  at around 150°C. It promises a larger safety margin to avoid high temperature catalyst hydrogen reduction. Shortens sulfiding time for  improved plant performance.

  5. Environmental friendly:

    • JYA-56 produces C4 hydrocarbon without needing a discharge torch. This reduces impurities in circulating hydrogen, lowers hydrogen consumption, and minimizes sulfide emissions.


Precautions of using JYA-56 ditert butyl polysulfide:

*Consult your catalyst supplier to calculate the sulfiding agent amount needed.

*Before using JYA-56 ditert butyl polysulfide, remember not to solely rely on the information provided here. It might not cover all specific uses or applications. Always seek additional guidance if needed.


  1. Injection:

During the early stages of sulfurization, it is essential to slowly and evenly inject the JYA-56 ditert butyl polysulfide .

Adjust the amount of JYA 56 ditert butyl polysulfide  added during the sulfurization process based on the changing H2S concentration in the circulating hydrogen.

Avoid injecting a large amount all at once or performing concentrated and rapid injections.

  1. Hydrogen Circulation and  Purity:

Throughout the entire sulfurization process, ensure there is sufficient hydrogen circulation.

The purity of the circulating hydrogen must be ≥85%.

  1. Forbidden:

Do not inject the JYA-56 ditert butyl polysulfide without sulfurization circulating oil.

Strictly avoid injecting the sulfurization agent into the circulating H2.

Transport information:

Delivery and Package of JYA-56 ditert butyl polysulfide

Via container or isotank. Small pacakges: 200 Liter/drum, 1000 Liter/IBC tanker

Storage of JYA-56 ditert butyl polysulfide

Store in a cool, ventilated place. When storing in the warehouse, ventilation should be maintained, and electrical facilities such as lighting should be explosion-proof, and stored separately from oxidants, reducing agents, acids and alkalis, and hazardous chemicals. If it is stored outdoors, it is necessary to protect it from exposure to the sun and rain, and keep it away from fire and high temperature areas. The storage area is equipped with first aid safety equipment such as emergency leakage treatment and containment.

Read more:

  1. Global manufacturers of  TBPS Di-Tertiary-Butyl Polysulfide


    • TBPS stands for Di-Tertiary-Butyl Polysulfide.

    • Chevron Phillips  produces TBPS as “TBPS 454”.

    • Lubrizol Corporation identifies it as “Sulfrzol 54”.

    • Junyuan Petroleum brands “JYA-56”.

  1. Four most important Factors to consider before selecting sulfiding agent:

    • Sulfur content

    • Decomposition temperature

    • Toxicity

    • Economy

  1. Key Differences Between TBPS and DMDS:

ü  Sulfur Content:

    • TBPS contains 54% sulfur, while DMDS has 68% sulfur.

ü  Decomposition Temperature:

    • TBPS decomposes at a lower temperature of 150°C, while DMDS decomposes at 200°C (in       the presence of catalysts).

ü  Vapor Pressure:

    • TBPS has a lower vapor pressure compared to DMDS.

ü  Odor:

    • TBPS has an odor similar to sour gasoil.

ü  Flammability:

    • Tertiary-butyl Polysulfide (TBPS) is non-flammable.

ü  Decomposition Products:

    • When TBPS breaks down, it produces H2S and butane. Butane improves hydrogen purity and maintains low gas density.

    • DMDS fully decomposes into H2S and methane. Methane's existence leads to sulfur emmission and more dydrogen consuming.

    • To fully sulfide a hydroprocessing unit, 20% more DMDS is needed than that of TBPS.