49 results about "Disulfur dichloride" patented technology

The invention discloses a clean preparation method of ethyl chloride with high purity. The method comprises the following steps: firstly, purifying a crude ethyl sulfide product by membrane distillation and molecular distillation in sequence to separate out impurities such as hydrogen sulfide gas, neutral oil and residues, then feeding the purified crude ethyl sulfide product into a chlorination process, thereby reducing byproducts in the chlorination process; filtering a crude ethyl chloride product obtained after chlorination, and then purifying the filtered crude ethyl chloride product by membrane distillation and molecular distillation in sequence to separate out impurities such as chlorine gas, hydrogen chloride and disulfur dichloride. The ethyl chloride produced by the method is high in purity, and no waste water is generated during the whole process, so that pollution to environment is minimized and resources are saved furthest.

The present invention relates to chemical synthesis technology. Sulfur dichloride is prepared through gas-solid reaction between chlorine and sulfur and subsequent cooling. During the reaction between chlorine and sulfur, disulfur dichloride is first produced; after the temperature is lowered and more chloride is introduced, sulfur dichloride is then produced; and after the reaction is finished, stabilizer is added to obtain the product. The said process has high sulfur dichloride yield, has stability, high purity over 98 %, low cost, no environment and is suitable for industrial production.

The present invention relates to a novel method for absorbing tail gas from trichloro-acetic chloride production through a chlorination process. The method can realize separation and recovery of hydrogen chloride, sulfur dioxide, sulfur, disulfur dichloride, and chlorine generated in the production process of trichloro-acetic chloride; the method is safe and easily controlled, has no harm to the environment, and generates by-products containing hydrochloric acid with concentration higher than 30% and a sodium bisulfite solution. The invention belongs to the technical field of environmental protection.

The invention discloses a synthesis method of O, O-diakyl thiphosphoryl chloride. In a reaction system where O, O-dialkyl S-hydro-phophorodithioate and chlorine are subjected to a chlorination reaction to prepare O, O-dialkyl thiphosphoryl chloride, an excess chlorine is introduced to make sulphur generated in the reaction be converted into disulfur dichloride, and disulfur dichloride is convertedinto sulfur dichloride afterwards; and by controlling the reaction temperature and arranging the reaction system to be in the negative pressure state, sulfur dichloride is moved out of the reaction system in the reaction process through distillation and condensing. The synthesis method substantially achieves the atomic economy based on a green chemistry concept; the overall cost of raw materialsis far lower than that in a traditional method, the amount of the three wastes is less, and the three wastes are easy to dispose; a traditional solid-liquid separation step is cancelled, automated production is facilitated, and meanwhile, improvement of the safety and environment production level of the device is facilitated; and O, O-dialkyl thiphosphoryl chloride is not in contact with water, disintegration of the product is avoided, the yield rate is as high as 93%, and the product content can reach 99%.

The invention discloses a method for preparing tetrasulfur tetranitride by ammoniation of disulfur dichloride. The reaction is performed in an ice-water bath, and is mainly characterized in that disulfur dichloride is diluted by taking absolute ether as a solvent, dried ammonia gas is introduced into the disulfur dichloride dilute solution in a circulating feeding manner for reaction, and a crudeproduct produced after reaction is completed is subjected to suction filtration to separate out the liquid phase and the solid phase. After the liquid phase is dried by distillation, insoluble substances are rinsed and filtered out with dichloromethane, and the obtained liquid is dried by spinning to obtain a solid; furthermore, the solid obtained by reaction is dissolved in water and filtered, soxhlet extraction is performed on the solid obtained after filtering with dioxane, and the extraction solution is cooled, filtered and dried by distillation to obtain a solid. Furthermore, the solids obtained in two times are combined, and recrystallization is performed by using methylbenzene, so as to obtain tetrasulfur tetranitride crystal. The method is simple in reaction, recyclable in solvent,green, economical and reasonable, and relatively high in yield.

The invention discloses a preparation method for synthetizing sulfur dichloride through gas phase catalysis. Granular activated carbon supported by ferric chloride (FeCl3 / C) is taken as a catalyst, disulfur dichloride and chorine are taken as a reaction raw material and a carrier gas, a vaporized gas mixture of the disulfur dichloride and the chorine enters a fixed bed catalysis tubular reactor, the sulfur dichloride is prepared with a continuous gas phase catalysis method, the sulfur dichloride produced through the reaction is cooled by a condenser to be collected, and the excess chlorine is recycled. The sulfur dichloride product obtained with the method is free of catalyst residues, distillation is not required, and the content of sulfur dichloride in the product is higher than 90%. The excess chlorine is recycled. The preparation method is simple to operate, continuous, stable, high in conversion rate and free of waste gas and waste liquor emissions, so that the environmental pollution is reduced.

The invention discloses a preparation method for carbon tetrachloride in the field of preparation of carbon tetrachloride. The preparation method comprises the following steps: step 1, metering carbon disulfide and a chlorine liquid, carrying out mixing, then adding the obtained mixture into a coiled reactor and carrying out a reaction, introducing reaction steam into a fractionating tower, and carrying out first fractionation; step 2, during fractionation of the reaction steam, collecting a first fractionated liquid carbon tetrachloride located at the top of the tower, and carrying out drying so as to prepare an industrial product; step 3, subjecting the tower liquid in the fractionating tower to full reflux, adding excessive carbon disulfide, allowing disulfur dichloride to chlorinate carbon disulfide; step 4, cooling the chlorinated liquid in the tower to 20 DEG C, carrying out crystallization so as to precipitate sulfur, and recycling the precipitated sulfur; step 5, adding a tower parent liquid into a chlorine introduction column, and introducing the chlorine liquid into the chlorine introduction column, and chlorinating excessive carbon disulfide so as to obtain a column chlorinated liquid; step 6, pressing the column chlorinated liquid into the fractionating tower, carrying out fractionation, evaporating a secondary fractionated liquid, and allowing the evaporated secondary fractionated liquid to enter a decomposing tank; and step 7, adding slaked lime into the decomposing tank, decomposing the disulfur dichloride in the secondary fractionated liquid, and subjecting the decomposed decomposition liquid to drying and rectification so as to obtain high-purity carbon tetrachloride. With a scheme provided by the invention, the purity of the carbon tetrachloride is improved; meanwhile, the recycling of by-products is realized.

The invention relates to the technical field of volatile organic chemicals waste gas treatment, and particularly relates to a volatile organic chemicals waste gas activated adsorbent, which is characterized by comprising the following components in parts by weight: 100 parts of circulating fluidized bedcoal-fired boilerfly ash, 5 to 10 parts of sulphur, and 1 to 1.5 parts of disulfur dichloride. Flue gas and emission pollutants, such as smoke dust of a boiler are high-value utilized to prepare the VOCs (Volatile Organic Chemicals) adsorbent, so that the aims of providing the cheap VOCs adsorbent, saving energy, reducing emission, recycling resources and the like are achieved.

The invention relates to the technical field of volatile organic compound waste gas treatment, in particular to a preparation method of a volatile organic compound waste gas activated adsorbent. The preparation method is characterized in that 100 parts of circulating fluidized bed coal-fired boiler fly ash, 5-10 parts of sulfur and 1-1.5 parts of disulfur dichloride are proportioned by weight and are activated and granulated, and boiler tail gas and boiler-discharged pollutants such as smoke dust are utilized in a high-value mode to prepare the VOCs adsorbent, and the purposes of providing the cheap VOCs adsorbent, saving energy, reducing emissions, recycling resources and the like are achieved.

The invention provides a high-yield trichloroacetyl chloride preparation method which comprises the steps of introducing chlorine into an acyl chloride mixture, and carrying out deep chlorination reaction to generate trichloroacetyl chloride; in the later stage of the reaction, detecting the component content of substances in the reaction kettle, if the content of acid components is high, adding disulfur dichloride into the reaction kettle, and enabling the generated acyl chloride mixture to still continue to be subjected to deep chlorination reaction with chlorine to generate trichloroacetyl chloride. According to the scheme, in the reaction process in the reaction kettle, the acyl chloride mixture and chlorine are subjected to deep chlorination, chloroacetic acid and dichloroacetic acid may be remained, components of materials in the reaction kettle are analyzed and detected at the moment, disulfur dichloride is added from a supplementing tank according to a detection result, the adding amount of the disulfur dichloride is controlled through a flow valve and a control valve, then the acid continues to be subjected to chlorination reaction to completely generate monochloroacetyl chloride and dichloroacetyl chloride, and then the monochloroacetyl chloride and the dichloroacetyl chloride continue to be subjected to deep chlorination, and are converted into trichloroacetyl chloride, so that the yield of the trichloroacetyl is improved.

The invention relates to the technical field of controlling volatile organic compound waste gases, in particular to a use method of an activation granulation tower special for preparing a volatile organic compound waste gas active adsorbent. The use method is characterized in that a tail gas discharged from a circulating fluidized bed waste heat boiler rises spirally in an activation granulation tower to achieve technological processes of mixing, cooling, activation, granulation and separation with overheated sulfuric steam, circulating fluidized bed coal-fired boiler fly ashes and disulfur dichloride fog drops, thereby completing an entire technical process of activation granulation of the adsorbent in the tower, and enabling batch continuous production to become possible.

The invention discloses a green synthesis method of methyl-chloride, which comprises the following steps: S1. In the reaction system for preparing methyl-chloride with methyl sulfide and chlorine gas as raw materials, disulfide dichloride can be used to Make the characteristic of methyl sulfide chlorination, by controlling the intake of chlorine, the disulfur dichloride produced in the reaction process continues to react with methyl sulfide to be converted into methyl-chloride and sulfur; S2, until the reaction is completed Finally, add Catalyst A and Catalyst B to the reaction system, so that the sulfur in the system is precipitated as loose crystals, and the crude sulfur and methyl-chloride are separated, and high-purity methyl-chloride is obtained through vacuum distillation. The present invention can not only prepare high-purity methyl-chloride, increase the yield, but also obtain crystalline sulfur with excellent properties, which can be reused; effectively avoiding the production of a large amount of saline wastewater and elastic sulfur waste residue, and also avoiding the pollution caused by waste gas. Pollution, green environmental protection, social benefits and environmental benefits are remarkable.