Di-tert-Butyl Polysulfide  （TBPS-56 ）

[Product Introduction]

TBPS-56 environmentally friendly and safe sulfiding agent is a newly launched product by our company. This product is not classified as a hazardous chemical according to the physical hazard classification standards and has the environmental characteristics of no bad smell and low odor. This product has a high flash point and strong safety performance, and is widely used in the fields of refining, petrochemicals, coal chemical industry, waste mineral oil regeneration, biodiesel, fine chemical industry, etc. for pre sulfurization of hydrogenation catalysts and sulfur injection. As a new generation of environmentally friendly and safe products, it has superior performance indicators and meets the general attention and policy requirements for environmental protection and safety in China and abroad. It is the most ideal green and reliable alternative to traditional dimethyl disulfide (DMDS) products.

[Product Nature]

The appearance of this agent is a light yellow to dark brown liquid, low toxicity, non flammable and explosive, irritating to the human body, but it will not have any side effects on the cracking furnace tube. This agent does not contain halogens and heavy metal elements, and will not have any side effects on subsequent system catalysts.

The technical requirements and test methods for TBPS-56 environmentally friendly and safe sulfiding agent are shown in Table 1.

Table 1 Technical Requirements and Test Methods

[Product advantages]

The comparison of physical and chemical properties between TBPS-56 environmentally friendly and safe sulfiding agent and DMDS is shown in the following figure:

By comparison, it is demonstrated that TBPS-56 sulfiding agent is an ideal substitute for traditional sulfiding agents. The main advantages are as follows:

1. This product has a lower odor. It can make the operation process safer, cleaner, and more efficient. DMDS (Dimethyl Disulfide) produces an extremely unpleasant odor, mainly caused by residual mercaptans in the production process. Once this substance spills out, it can have a significant impact on refinery workers and surrounding communities. Compared to TBPS-56 , its odor is lower and safer.

2. The flash point of DMDS is relatively low, only 18 ℃, which is considered flammable and poses a significant fire hazard during use. However, TBPS-56 has a flash point of over 100 ℃, which is considered non flammable and greatly reduces potential production, transportation, and storage risks. DMDS needs to be transported by specialized hazardous chemical vehicles, while TBPS-56 only requires regular transport vehicles for transportation. Due to its high flash point and low odor, it can eliminate the cost expenditures and concerns caused by strict storage requirements.

3. Due to its low risk, the TBPS-56 product can be filled with a portable low-pressure pump during operation.

4. TBPS-56 has a low decomposition temperature and can be injected into the system at around 160℃, allowing it to participate in the sulfiding reaction. The catalyst has a better sulfiding effect and higher activity. At the same time, it can also shorten the sulfiding time, allowing the device to achieve better efficiency.

5. The decomposition of dimethyl disulfide to produce non condensable gas requires the discharge of a torch, while the butane produced by the TBPS-56 reaction does not require the discharge of a torch, which has the environmental advantages of saving hydrogen consumption and reducing sulfide emissions.

[Precautions]

1. Before wet pre sulfiding of the catalyst, the user should verify and calculate the theoretical injection amount of the sulfiding agent with the catalyst supplier, and calculate the actual purchase amount based on this.

2. The user should follow the pre sulfidation plan provided by the catalyst supplier to control the pre sulfidation plan, operation steps, and other process conditions.

3. During the initial stage of sulfidation , the injection of TBPS-56 sulfiding agent should be slow and uniform. The amount of sulfiding agent added during the sulfidation process should be adjusted according to the changes in H2S concentration in the circulating hydrogen, and it is important not to inject a large amount at once or concentrate on rapid injection.

4. During the entire sulfidation process, it is necessary to ensure sufficient hydrogen circulation and a hydrogen purity of ≥ 80%.

5. Prohibit injecting TBPS-56 sulfiding agent without sulfurized circulating oil; Do not inject sulfiding agents into the circulating H2; It is also not advisable to directly inject the sulfiding agent into the inlet of the reactor equipment.

6. TBPS-56 cannot be used for sulfidation of precious metal catalysts such as Pt, Pd, Rh, Ru, etc.

[Product Packaging]

This additive is packaged in a 1000L specialized drum with a net weight of 1000KG.

[First aid measures]

1. Skin contact: Remove contaminated clothing and thoroughly rinse with soap and water.

2. Eye contact: Immediately open the upper and lower eyelids, rinse with flowing water, and seek medical attention.

3. Inhalation: Quickly remove from the scene to a place with fresh air, and seek medical attention if necessary.

4. Ingestion: If taken by mistake, rinse your mouth immediately, drink plenty of warm water, induce vomiting, and seek medical attention.

[Security Protection]

Store in a cool and low-temperature place, avoiding contact with fire or heat sources. In case of fire, dry powder or carbon dioxide fire extinguishers can be used to extinguish the fire.

[Transportation]

This product is non flammable and should be handled with care during shipment. It should not be rolled or thrown on the ground. When stacking docks and freight yards, tarpaulin should be covered to prevent rain and avoid direct sunlight exposure.

[Storage]

It should be placed in a warehouse that is moisture-proof, dry, sun proof, rainproof, and ventilated, and should have a "No Smoking" sign.