5 results about "Sulfur dichloride" patented technology

This disclosure provides a method for preparing sulfidated alkylphenol salt products to achieve a high sulfidation ratio of sulfidated alkylphenol salt to unsulfidated alkylphenol salt / phenol in the context of neutralization and optional over-alkaliening additives. The sulfidated alkylphenol salt products are obtained by sulfidating alkylphenols with a sulfur chloride blend comprising about 40% to about 75% by weight of sulfur dichloride.

This invention relates to the field of rare earth catalytic synthesis of rubber, and discloses a branched butadiene-isoprene copolymer and its preparation method. The preparation method includes the following steps: under a protective atmosphere, a composite branching agent is added to a butadiene and isoprene monomer solution, and then a rare earth catalyst is added to react fully to obtain the butadiene-isoprene copolymer; wherein the composite branching agent is prepared as follows: under a protective atmosphere, alkyl aluminum is added dropwise to a sulfur dichloride solution and reacted fully to obtain the desired composite branching agent; the present invention constructs a sulfur dichloride-alkyl aluminum composite branching agent, which is used in the branched butadiene-isoprene copolymerization reaction to obtain a branched copolymer with high cis structure content, excellent mechanical properties and processing properties.

The utility model provides a device of secondary sulfur distribution of thionyl chloride rectification system, include: sulfur distribution tank, rectifying column, two shunt settings'supplement sulfur tank, thionyl chloride conveying unit and liquid sulfur supply unit, the crude product thionyl chloride of synthetic procedure output is connected with the inlet of sulfur distribution tank, the outlet of sulfur distribution tank is connected with the inlet of rectifying column, the top outlet of rectifying column is connected with the material inlet of two supplement sulfur tanks respectively through thionyl chloride conveying unit, the liquid sulfur supply unit's outlet is connected with the liquid sulfur inlet of two supplement sulfur tanks respectively, and the discharge port of supplement sulfur tank is used for outputting secondary sulfur distribution thionyl chloride, adopt liquid sulfur supply unit, make liquid sulfur replace traditional solid sulfur, solve the technical problem that solid sulfur is easy to block pipeline and rectifying column, set up the supplement sulfur tank system of shunt, realize the continuous discharge of supplement sulfur tank through intermittent operation, carry out the depth conversion of the unreacted sulfur dichloride in the preposition procedure, improve the purity of subsequent rectification thionyl chloride product.

The application discloses a method for producing thiodicarb by using a single solvent and without catalyst, which comprises the following steps: reacting SCl2 with pyridine to generate a ligand dipyrrolidone monosulfide hydrochloride in a solvent; dissolving methomyl in the solvent to obtain a methomyl solution, mixing a part of the solution with the ligand dipyrrolidone monosulfide hydrochloride to obtain a mixed solution, and continuously feeding the mixed solution and the mixed solution into two reaction kettles in sequence to synthesize thiodicarb; performing solid-liquid separation, pressure filtering the solid after washing with water, centrifuging the solid after washing with a solvent, and vacuum drying to obtain a final product. The preparation method provided by the application does not use any catalyst, avoids a subsequent catalyst removal step, uses only dichloroethane as a solvent for thiodicarb synthesis, and the feeding amount of sulfur dichloride and pyridine is close to the theoretical value, so that the reaction process is almost in a homogeneous state, the reaction speed is fast, the conversion rate of raw material methomyl is high, and the yield of finished product thiodicarb is high.

The application discloses a novel green synthesis process of thiodicarb, which uses chlorinated sulfur, methomyl and pyridine as raw materials to prepare thiodicarb, replaces sulfur dichloride in the traditional process with low-cost chlorinated sulfur, reduces the cost of raw materials, uses pyridine as alkalizing agent and solvent, dissolves methomyl in pyridine, makes the reactants in the liquid phase system, is beneficial to mass transfer, heat transfer and improves the reaction effect, removes the water washing process, uses methanol as a washing agent to wash the product, and avoids the problem of large amount of waste water in the conventional process. Under the process operation condition, the conversion rate of methomyl reaches 98.5%, the yield of thiodicarb reaches more than 92.1%, and no waste water is generated in the main process. The prepared thiodicarb is white powder, the colors of products of each batch are consistent, the content is greater than 97.6%, the thermal decomposition rate is less than 2.4%, and the appearance, content and thermal storage stability of the product meet the product standards.