37 results about "Iodine pentafluoride" patented technology

The invention relates to a sulfur tetrafluoride production technique, belonging to the field of fluorochemicals. The sulfur tetrafluoride production technique comprises fluorine gas purification, iodine pentafluoride preparation, sulfur tetrafluoride reactive synthesis, sulfur tetrafluoride separation and trapping, sulfur tetrafluoride distillation and canning, secondary recycling of iodine pentafluoride as well as discharge of exhaust gas. By using a low-temeprature condensing device, the electrolytic fluorine is purified to remove a great amount of hydrogen fluoride, so the fluorine gas concentration is largely improved. A condensing and recycling device is employed to recycle iodine and iodine pentafluoride for re-use, thus the utilization ratio of iodine can reach above 70% and material losses can be reduced. Due to a constant distillation method, the purity of sulfur tetrafluoride products can reach above 99.9%, and the products can be charged into a steel cylinder more safely. In addition, the entire sulfur tetrafluoride production technique is controlled by a automatic DCS (distributed control system) device, which reduces artificial randomness and experience and improves the stability of product quality.

The invention relates to a one-step preparation method of perfluoroalkyl iodide, belonging to the field of fluoride product intermediates. The preparation method comprises the following steps: adding iodine, iodine pentafluoride and a composite catalyst into a reaction vessel, vacuumizing to -0.095 MPa, replacing air in the reaction vessel with high-purity nitrogen gas for times until the water content is not more than 100 ppm and the oxygen content is not more than 30 ppm, heating the reaction vessel until the internal temperature is 60-80 DEG C, adding tetrafluoroethylene, and maintaining the pressure at 0.5-0.7 MPa for reaction; and raising the reaction temperature to 130-150 DEG C when the pressure does not decrease after adding tetrafluoroethylene, continuing introducing tetrafluoroethylene, and controlling the pressure at 2.8 MPa for reaction to obtain the perfluoroalkyl iodide. In the preparation method, the perfluoroalkyl iodide is synthesized by one-step reaction from iodine pentafluoride, two-step reaction is continuously carried out in the reaction vessel, and the reaction effect is greatly enhanced by using the composite catalyst; and the original two-step reaction is changed into a one-step reaction, thus reducing the production steps, simplifying the production process and equipment and lowering the production investment.

The invention relates to a process for purifying and rectifying sulfur tetrafluoride, which comprises the following steps of: reacting iodine pentafluoride and sulfur in a sulfur tetrafluoride reactor to synthesize crude sulfur tetrafluoride gas, obtaining a liquid primary sulfur tetrafluoride product with purity of more than or equal to 95 percent through a cooler, a condensation separator and acondensation trap, obtaining a liquid sulfur tetrafluoride product with purity of more than or equal to 99.9 percent by a rectifying process, and continuously charging the product into a steel bottle. The liquid sulfur tetrafluoride product is directly trapped and produced and continuously liquefied and bottled, so damage of low-temperature bottling to the steel bottle is avoided, and the safety is higher. The purity of the sulfur tetrafluoride product is greatly improved by the cooling, separation, trapping and continuous rectification technology adopted in the process.

There is provided a process for the production of iodine pentafluoride which avoids the problems of the production process of iodine pentafluoride of the prior art as much as possible, and which carries out the reaction of fluorine and iodine moderately, so that iodine pentafluoride is produced more safely and more productively. In the process for the production of iodine pentafluoride by reacting fluorine and iodine, fluorine is supplied to the gas phase 14 which is adjacent to the liquid phase 12 of iodine pentafluoride which contains iodine.

The invention discloses an iodine pentafluoride production method characterized by continuous reaction, high yield, mild and complete reaction, and extremely light pollution degree. The method includes: in an airtight reactor, placing solid iodine above liquid iodine pentafluoride or an iodine pentafluoride solution of iodine; then introducing fluorine gas into the liquid iodine pentafluoride or the iodine pentafluoride solution of iodine, and simultaneously employing a flowable cooling medium to cool the liquid iodine pentafluoride or the iodine pentafluoride solution of iodine and the gas phase generated above solid iodine in a flow direction from the bottom up, controlling the temperature of the liquid iodine pentafluoride or the iodine pentafluoride solution of iodine at 15-100DEG C, and making the iodine pentafluoride steam and iodine steam in the gas phase generated above the solid iodine condense and flow back to the liquid iodine pentafluoride or the iodine pentafluoride solution of iodine. The invention also discloses production equipment special for the method.

The invention discloses a method and equipment for distilling and purifying iodine pentafluoride. The method comprises steps as follows: (I), performing a leakage test on a tower reactor; (II), performing feeding on the tower reactor; (III), performing vacuum pumping treatment; (IV), heating the tower reactor and receiving front cut fractions; (V), receiving main distillate fractions; (VI), performing after-cut fraction treatment. The equipment comprises a distillation column, the tower reactor, a tower bottom oil bath reboiler and a tower top fractional condenser. According to the method and the equipment for distilling, separating and purifying iodine pentafluoride prepared with an iodine and fluorine fluorination method, an iodine pentafluoride product with the purity of 99.5% or higher can be obtained continuously and stably, and the content of metal ions is 50 ppm or lower.

The invention relates to a sulfur tetrafluoride production technique, belonging to the field of fluorochemicals. The sulfur tetrafluoride production technique comprises fluorine gas purification, iodine pentafluoride preparation, sulfur tetrafluoride reactive synthesis, sulfur tetrafluoride separation and trapping, sulfur tetrafluoride distillation and canning, secondary recycling of iodine pentafluoride as well as discharge of exhaust gas. By using a low-temeprature condensing device, the electrolytic fluorine is purified to remove a great amount of hydrogen fluoride, so the fluorine gas concentration is largely improved. A condensing and recycling device is employed to recycle iodine and iodine pentafluoride for re-use, thus the utilization ratio of iodine can reach above 70% and material losses can be reduced. Due to a constant distillation method, the purity of sulfur tetrafluoride products can reach above 99.9%, and the products can be charged into a steel cylinder more safely. In addition, the entire sulfur tetrafluoride production technique is controlled by a automatic DCS (distributed control system) device, which reduces artificial randomness and experience and improves the stability of product quality.

The invention discloses a preparation method of iodine pentafluoride. According to the preparation method, iodized alkali metal salt or iodized alkaline-earth metal salt is used as a raw material, iodine pentafluoride is used as a solvent, and a fluorine-nitrogen gas mixture is continuously introduced. At the reaction temperature of 50-150 DEG C, the iodized alkali metal salt or alkaline-earth metal salt is fluorinated for 150-500 h so as to obtain iodine pentafluoride. The invention has advantages as follows: the technology is simple; the raw material is easily available; reaction efficiency is high; and the method is green and environmentally friendly and is suitable for industrial production.

The invention discloses a method for preparing nano graphite fluoride at a low temperature. The method comprises the following steps that (1) nano graphite, citric acid and absolute ethyl alcohol aremixed to be uniform and activated for 3-5 hours at the temperature of 120-130 DEG C, after the temperature of the mixed liquid is decreased to be room temperature, silver fluoride and iodine pentafluoride are added in the mixed liquid, the mixed liquid is reacted for 1.5 to 2 hours at the temperature of 37-52 DEG C, and a reaction product is obtained; (2) the reaction product is subjected to vacuum filtration to obtain a solid product, the solid product is added into a potassium iodide solution to be stirred and then filtered, after the obtained filter residue is treated, nano graphite subjected to pretreatment is obtained; and (3) mixed gas of fluorine and nitrogen is injected into the nano graphite subjected to pretreatment to react for 1.5-2.5 hours at the temperature of 200-240 DEG C,and a finished product is obtained. Compared with a high temperature gas phase synthesis method, the graphite intercalation compound has higher activity than graphite, is more liable to react with fluorine, the content of fluorine is higher, the reaction temperature is lower, and the safety is higher.

The invention discloses a preparation method and production device of iodine pentafluoride. The preparation method comprises following steps: (1) adding iodine pentafluoride and molten iodine respectively into a first reaction kettle and a second reaction kettle to form a mixed system; (2) feeding a mixed gas containing fluorine and nitrogen into the first reaction kettle, feeding the rest mixed gas into the second reaction kettle for reaction, and discharging the rest gas; (3) when the reaction in the first reaction kettle is finished, discharging generated iodine pentafluoride and then preparing the mixed system; (4) feeding the mixed gas containing fluorine and nitrogen into the second reaction kettle, feeding the rest mixed gas into the first reaction kettle for reaction, and discharging the rest gas; (5) when the reaction in the second reaction kettle is finished, discharging generated iodine pentafluoride and then preparing the mixed system; and (6) repeatedly performing the operations from the step (2) to the step (5). The preparation method achieves continuous production of the iodine pentafluoride and increase a utilization ratio of the raw materials. A product is stable in quality and high in yield. Meanwhile, waste of a fluorine resource and environmental pollution are avoided.

The invention discloses a synthetic method for 1,3,3,3-tetrafluoropropene. The synthetic method comprises the following steps: (1) adding a mixture of iodine, iodine pentafluoride and a catalyst into a reactor, controlling reaction temperature, introducing trifluoropropene, and stopping the reaction when system pressure is stable so as to obtain 1,3,3,3-tetrafluoro-2-iodopropane, wherein a mass ratio of iodine to iodine pentafluoride is 1: 0.4-0.5, a mass ratio of iodine to the catalyst is 1: 0.01-0.05, reaction temperature is -15 to 35 DEG C and reaction pressure is 0.1 to 0.6 MPa; and (2) evaporating the material 1,3,3,3-tetrafluoro-2-iodopropane in the reactor, introducing the evaporated 1,3,3,3-tetrafluoro-2-iodopropane into a reactor filled with alkali lye, carrying out a reaction at normal pressure, and subjecting a gas phase product to drying and compression so as to obtain the product 1,3,3,3-tetrafluoropropene, wherein reaction temperature is 35 to 80 DEG C. The method provided by the invention has the advantages of simple equipment, high operation security, high product purity, etc.

The invention relates to a material recycling technique used during sulfur tetrafluoride production. Firstly, the coarse sulfur tetrafluoride gas is produced through reactive synthesis of iodine pentafluoride and sulfur in a sulfur tetrafluoride reactor and then raw materials are initially recycled through condensation, separation and trapping. The impure gases obtained by gas pahse purification during condensation, separation and trapping of sulfur tetrafluoride are evacuated and recovered again through a secondary condensation recovery device. The condensation recovery devices in the initial and secondary stages are utilized to recycle iodine and iodine pentafluoride, which can increase the utilization rate of iodine by more than 70%. The technique can not only reduce material losses and lower production cost but also cut down the volumes to be purified.

The invention discloses a method for continuously preparing iodine pentafluoride. According to the method, a serial process flow of a multistage tower type reactor is adopted; according to process requirement, the tower number can be 1-N grades, wherein N is more than or equal to 3; in the atmosphere containing sulfuryl fluoride (RfSO2F), an iodine pentafluoride solution of iodine and fluoride gas or mixed gas of fluoride and nitrogen respectively enter a multistage reaction tower from two ends, reversely flow and generate a reaction. The method has the advantages that the reaction temperature is controllable, higher safety is ensured and the phenomenon that the iodine is excessively fluoridized at high temperature to generate IF7 is avoided; two iodine dissolving tanks are alternatively used so as to facilitate the continuous atomization; the sulfuryl fluoride atmosphere facilitates the operation of a gas-liquid reaction and is remarkably superior to the hydrogen fluoride existing atmosphere introduced in other patents, so that the purification of products is facilitated; and unreacted fluoride gas in tail gas can be adsorbed by solid salts or alkali and then be recycled. The process equipment and parts are made of general steel; and pitting-free chemical nickel-plating treatment and fluorine gas passivation treatment are used in sequence so as to effectively reduce the investment cost and facilitate the industrialization.

A technology for preparing pentafluoroethyl iodide by a one-step method. By the adoption of a multiple-stage tower reactor series connection process flow (N is greater than or equal to 2 upon the process requirements), an iodine pentafluoride solution, a gas mixture of perfluoroalkyl sulfonyl fluoride and fluorine nitrogen and tetrafluoroethene respectively enter into the multiple-stage tower reactor from two ends and countercurrently flow for reaction. The invention has the following advantages: fluorine gas, iodine and tetrafluoroethene are used as raw materials to react so as to synthesize pentafluoroethyl iodide in one step; the newborn iodine pentafluoride in the invention has high activity and can perform a mild reaction at the temperature of 60-65 DEG C; the catalyst perfluoroalkyl sulfonyl fluoride can be used as a catalyst and a surfactant to raise the reaction rate and the yield; two iodine-eroded grooves and a tail gas absorbing tower cooperate and are alternatively used to make the reaction continuously automated; unreacted fluorine gas can be adsorbed by active alumina and then recovered and reused; the technological equipment and parts, which are made from regular steel, undergo a pock-free electroless nickel plating treatment and a fluorine passivation treatment, so as to prevent the damage of corrosive chemicals to the equipment, reduce the investment cost and benefit for industrialization.