Synthesis method and process of tin butyl mercaptide
Butylmercaptostannane, chemical formula C4H10OSSn, is a commonly used organotin compound, mainly used as a stabilizer for polyvinyl chloride (PVC) and is favored for its excellent thermal stability and transparency. . The following will discuss several typical synthesis methods and process flows of butyltin mercaptide.
Synthetic route one: reaction between butyltin chloride and mercaptans
This is one of the common methods for synthesizing tin butyl mercaptide. Butyltin chloride (BuSnCl3) is used as the starting material and reacts with butylthiol (BuSH) under an appropriate solvent and temperature to generate butyltin mercaptide. This reaction can be expressed as:
BuSnCl3+BuSH→Bu2SnS+3HClBuSnCl3+BuSH→Bu2SnS+3HCl
Process steps:
- Raw material preparation: Weigh butyltin chloride and butylmercaptan in a certain proportion, and prepare a dry reaction vessel and solvent.
- Control of reaction conditions: Under nitrogen protection, dissolve the raw materials in a solvent, such as dichloromethane or tetrahydrofuran, and then stir the mixture under mild heating conditions.
- By-product removal: After the reaction is completed, unreacted raw materials and by-products are removed by filtration or distillation. For example, hydrochloric acid can be removed by washing with water.
- Product purification: Further purify the product through column chromatography, crystallization or distillation.
- Finished product inspection: Products need to undergo quality inspection, including the measurement of purity, color, specific gravity, refractive index and other indicators to ensure compliance with standards.
Synthesis Route 2: Reaction of Butyltin Alcohol and Hydrogen Sulfide
Another synthetic route is to use butyltin alcohol (Bu2SnOH) to react with hydrogen sulfide (H2S) to generate butyltin mercaptide. The reaction equation is as follows:
Bu2SnOH+H2S→Bu2SnS+H2OBu2SnOH+H2S→Bu2SnS+H2O
Process steps:
- Raw material mixing: Mix butyltin alcohol and hydrogen sulfide gas under an inert gas environment.
- Reaction catalysis: Catalysts (such as acids or bases) may be needed to promote the reaction.
- Product isolation: by distillation.��Other physical methods separate products and unreacted raw materials.
- Refining: Use appropriate methods to remove impurities and improve product purity.
Process notes:
- Safety considerations: The raw materials and by-products involved in the synthesis process of butyltin mercaptide may be corrosive or toxic. Appropriate personal protective equipment must be worn during operation and in a well-ventilated environment. carried out under the conditions.
- Reaction conditions: Controlling reaction temperature, pressure and solvent selection are crucial to the efficiency of the reaction and the purity of the product.
- Environmental protection measures: By-products produced by the reaction, such as hydrochloric acid or water, need to be properly treated to avoid environmental pollution.
Conclusion
The synthesis of tin butyl mercaptide is a process involving multi-step chemical reactions, which requires precise control of reaction conditions and process parameters. In industrial production, factors such as cost-effectiveness, environmental protection and safety regulations also need to be considered to achieve efficient, green and sustainable production goals. Different synthesis routes are suitable for different production scales and needs, and choosing the appropriate process flow is the key to success.
Extended reading:
bismuth neodecanoate/CAS 251-964-6 – Amine Catalysts (newtopchem.com)
stannous neodecanoate catalysts – Amine Catalysts (newtopchem.com)
polyurethane tertiary amine catalyst/Dabco 2039 catalyst – Amine Catalysts (newtopchem.com)
N-Methylmorpholine – morpholine
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