37results about "Thionyl chloride" patented technology

The invention belongs to the technical field of chemical industry production, and in particular relates to a method for producing thionyl chloride. The method comprises the following steps: sulfur dioxide gas and synthetic gas generated by reaction of sulfur and chlorine gas in a synthesis reactor enter a reactor together, the crude product thionyl chloride in a gaseous form generated by reaction in the reactor directly enters a rectifying tower through an absorbing tower; the gas phase at the top of the rectifying tower enters a reflux drum after condensation; the gas phase in the reflux drum enters an evacuated drum through an ejector, and then is cyclically nested back to the synthesis reactor; and a qualified product is obtained in the middle part of the rectifying tower. According to the method for producing thionyl chloride, because the process pipeline is short and a process of condensing regasification is saved, heat in the system can be utilized more sufficiently, and the energy consumption of devices is greatly reduced.

The invention discloses a regeneration method using waste thionyl chloride, which uses polyacrylamide and zeolite to prepare polyacrylamide / zeolite cross-linked composite adsorption materials in the presence of a coupling agent, and cross-links polyacrylamide / zeolite at normal temperature. Combined composite adsorption material and waste thionyl chloride were placed in a stirrer, mixed evenly, adsorbed for 60-120 minutes, and subjected to vacuum distillation at 78°C to obtain more than 99.5% of the first-grade thionyl chloride. The present invention solves the problems of high energy consumption, complex process, and environmental pollution in the recovery of waste thionyl chloride, and provides a waste thionyl chloride recovery method with low cost, simple production process, easy industrialization and no pollution, which can be used in Recovery of waste thionyl chloride from different acyl chloride production processes.

The invention relates to a method for optimizing a production process of thionyl chloride and belongs to the technical field of chemical engineering. Liquid sulfur in a liquid sulfur tank is metered by a metering pump and then pumped into an atomizing device in a distillation column; a crude thionyl chloride product is mixed with the liquid sulfur at the top of the distillation column; sulfur dichloride in the crude thionyl chloride product and the liquid sulfur are subjected to a reaction, a heavy component, namely, sulfur monochloride, is produced and withdrawn from the bottom of the distillation column, remaining crude thionyl chloride product is condensed by a condenser and enters a return tank, a part of liquid phase in the return tank is pumped into the distillation column by a reflux pump to be recycled, and the remaining liquid-phase material is recovered from the return tank. By means of the method, automatic sulfur addition is realized, time and labor cost are saved, and thedecoloration effect is better.

The present invention relates to the technical field of chemical industry production and in particular relates to a production technology of thionyl chloride. Sulfur and chlorine gas are reacted in a synthesis reactor to produce synthesis gas, the synthesis gas and sulfur dioxide gas enter together into a reactor, produced crude products of the thionyl chloride after the reaction in the reactor directly enter into a distillation column in a gas state, and gas phase from the top of the distillation column is condensed, the condensed gas enters into a reflux tank; and gas phase in the reflux tank enters into an evacuation tank via an ejector, the treated gas is recycled into the synthesis reactor, and qualified products are collected at the middle part of the distillation column. The production technology is simplified and the technologies of condensation, sulphur combining, light component recycling, etc. of the reacted crude products of the thionyl chloride are saved. Due to the reduction of the condensation and regasification, the technology is relatively short in routes and minimal in heat loss, and greatly reduces energy consumptions of the devices.

The present invention is a continuous sulfur adding device and method for sulfur oxychloride sulfur mixing system, which is characterized in that: (1) the liquid sulfur in the sulfur melting tank is pumped into the pipeline reactor through the jacket pipe by the first machine pump, and the flow rate is controlled At 350-500kg / h, the temperature of the steam in the jacketed tube is 160-168°C, and the pressure is 0.4-0.6MPa; (2) The crude sulfur oxychloride liquid is pumped into the pipeline reactor by the second machine, and the control The flow rate is 4600-4800 kg / h; (3) Control the mixing of crude thionyl chloride and liquid sulfur at the inlet of the pipeline reactor, and control the temperature of the pipeline reactor by controlling the opening of the circulating water inlet valve of the pipeline reactor jacket The temperature is 45~65°C. After the reaction, it enters the buffer tank and waits for the rectification system to carry out rectification and purification of thionyl chloride. The advantages of the present invention are that the reactor is a pipeline reactor, compared with kettle-type sulfur blending, it reduces power consumption, is convenient for maintenance, the fluid is strongly disturbed in the reactor, and the mixing is more uniform, which can ensure the continuity of operation and improve production efficiency.

The invention belongs to the technical field of chemical production, and in particular relates to a production process of sulfoxide chloride. The production process comprises the following steps: enabling synthetic gas generated by reaction of sulfur and chlorine gas in a synthesis kettle, and sulfur dioxide gas to enter a reactor together; directly de-coloring a crude product sulfoxide chloride, generated by reaction in the reactor, through a sulfur tank in a gas-state form, and then conveying the crude product into a decomposer; enabling a gas-phase crude product sulfoxide chloride from the decomposer to enter a rectifying tower; after condensing a gas phase at the top of the rectifying tower, enabling the gas phase to enter a refluxing tank; after enabling the gas phase in the refluxing tank to enter an evacuation tank through an injector, recycling the gas phase back into the synthesis kettle, and taking out a qualified product from the middle part of the rectifying tower. The production of the sulfoxide chloride is fully sealed circulating production, and no wastewater, waste gas and waste dreg are discharged; the yield of the product basically reaches 100 percent.

The invention provides a thionyl chloride production system and a start-up method thereof, the system comprises a sequentially connected sulfur dichloride synthesis kettle, a thionyl chloride synthesis kettle, a crude product condenser, a gas-liquid separator, and a crude product receiving tank , a sulfur distribution kettle, a rectification kettle, a rectification tower, a rectification condenser, a finished product tank, a crude product circulation device, and a stabilizing device; the liquid inlet of the crude product circulation device is connected with the liquid outlet pipeline of the crude product receiving tank, and the The liquid outlet of the crude product circulation device is connected with the liquid inlet pipeline of the crude product receiving tank, and is used to circulate the sulfur oxychloride crude product after the system is started; the described stabilization device is respectively connected with the crude product receiving tank and the crude product circulation device, It is used to control the purity of the crude thionyl chloride from the start-up of the system to the stable stage of operation. The thionyl chloride production system and its start-up method described in the present invention can promote the thionyl chloride production system to reach a stable operation state as soon as possible, and shorten the time required for the system to run from start-up to stable operation.

The invention relates to a method and a device for refining sulfoxide chloride. The method comprises the following steps: after rectifying a crude product generated in a sulfoxide chloride synthesis step, performing overvulcanization and condensation on the rectified light component, putting a liquid-phase component obtained through gas-liquid separation into a rectification cycle and putting a gas-phase component obtained through gas-liquid separation into a synthesis step cycle; condensing the gas-phase component generated after the rectified light component is subjected to first vacuum distillation and then putting the condensed gas-phase component into the synthesis step cycle, and performing second vacuum rectification on a heavy component; performing overvulcanization and condensation on the light component obtained by virtue of the second vacuum rectification, returning the liquid-phase component obtained through gas-liquid separation to the second vacuum rectification step cycle, and returning the heavy component to the rectification step cycle; putting the gas-phase components obtained in the two stages of vacuum rectification steps into the synthesis step cycle, respectively. According to the method, a tower system sequence is arranged reasonably, the easily decomposable components are separated under vacuum and at a controlled temperature, and the components difficult to separate are cyclically rectified, and therefore, the separation accuracy and the product quality are improved; after multi-stage rectification, the purity of sulfoxide chloride is above 99.9%.

The invention provides method and equipment for refining of thionyl chloride. A gas mixture generated from a thionyl chloride synthesis kettle is subjected to two steps of sulfur mixing reaction in the process of purifying; particularly, the two steps of sulfur mixing reaction includes firstly, directly introducing the gas mixture discharged from the thionyl chloride synthesis kettle into a firstsulfur mixing kettle for realizing sulfuration, and purifying sulfuretted gas mixture through condensing and degassing to obtain crude thionyl chloride product; secondly, arranging a secondary sulfuration bed on the top of a rectifying apparatus, rectifying and purifying the crude thionyl chloride product for secondary sulfuration, and arranging catalysts in the secondary sulfuration bed. Since the gas discharged from the thionyl chloride synthesis kettle is of high temperature, heating before sulfur mixing reaction is omitted, equipment input is reduced, and decomposition of thionyl chlorideduring heating is reduced; besides, sulfur and drying agents are mixed and added, the circumstance of introducing moisture along with adding of sulfur is avoided, content of impurity of products is reduced, non-condensable gas in the production process is extracted fully, and utilization rate of raw materials is increased.