33 results about "Fluorochemical industry" patented technology

The invention belongs to the filed of fluorochemical industry and provides a method for separating a trifluoroethylene in the production of a tetrafluoroethylene. The specific technical steps are as follows: a material gas on the top of a recovery tower of the tetrafluoroethylene enters directly into a distillation column; the tetrafluoroethylene and the trifluoroethylene in the material gas are separated from other components; the tetrafluoroethylene and the trifluoroethylene in the material gas aggregate on the top of the column and the rest components return to a system after the recovery tower of the tetrafluoroethylene through the bottom column; a mixture of the tetrafluoroethylene and the trifluoroethylene enters into an extraction column and the trifluoroethylene is absorbed by utilizing an extracting agent; the trifluoroethylene enters into an absorption tower with the extracting agent and is separated from an extracting liquid by steam heating in the absorption tower; the trifluoroethylene aggregates on the top of the absorption tower and then enters into a trifluoroethylene tank. The invention realizes efficient separation on the trifluoroethylene, controllability on the quality of the tetrafluoroethylene and has great potentiality in the aspect of environmental protection.

The invention discloses a processing method of wastes produced when battery grade lithium fluoride is manufactured by adopting a carbonization method, and the processing method comprises the steps that: A: excess sodium carbonate is added into a lithium fluoride waste liquor to react with the lithium fluoride waste liquor, a solid lithium carbonate paste is obtained after a reaction product is filtered, and a filter liquor is a spare mixed solution containing the left sodium carbonate; and B: a lithium carbonate waste material and aluminium hydroxide react with excess anhydrous hydrogen fluoride in a fluidized bed to obtain anhydrous aluminum fluoride containing lithium fluoride, and tail gas of the reacted anhydrous hydrogen fluoride is led into the mixed solution containing the left sodium carbonate in the step A so as to obtain a sodium fluoride solution. By adopting the processing method disclosed by the invention, two main wastes produced when the battery grade lithium fluoride is manufactured by adopting the carbonization method are both converted to useful substances capable of being used in downstream industries of inorganic fluorides, so the environmental protection problem to be solved in the fluoride chemical industry and the aluminum electrolysis industry is solved; and in addition, all raw materials are taken from production wastes of the battery grade lithium fluoride, secondary pollution cannot be produced, the resource utilization rates of fluorine and lithium are improved, and sustainable development of the inorganic fluoride chemical industry is urged.

The invention discloses a treatment process for fluorine chemical wastewater. The process comprises the following steps: sequentially carrying out one-time regulating, carrying out iron-carbon reaction pre-treatment, carrying out iron-carbon precipitation, carrying out one-time calcium salt reaction, carrying out one-time calcium salt precipitation, adjusting for the second time, carrying out bioelectrocatalysis, carrying out an aerobic contact oxidation, carrying out second-time calcium salt reaction, second-time precipitation and discharging water. The process provided by the invention is used for treating the fluorine chemical wastewater; the wastewater treated by the process can achieve primary standards of Integrated Wastewater Discharge Standard (GB8978-1996) and the operation cost of wastewater treatment is low.

The invention discloses a high-temperature-resistant corrosion-resistant graphitic acid distributor and a manufacturing method thereof. The graphitic acid distributor comprises an acid disc, wherein overflow pipes are uniformly distributed inside the acid disc; both the acid disc and the overflow pipes are made of graphite material. The acid distributor is made of the graphite material, the graphite has high-temperature resistance and corrosion resistance, the influence of temperature on the graphite material is slight, the deformation amount is small, the distribution uniformity of materials in tower equipment in chemical production is guaranteed, and bias of the materials in the tower equipment is reduced. Compared with the conventional acid distributor made of a polytetrafluoroethene material, the graphitic acid distributor manufactured by adopting the manufacturing method has the advantages that the temperature resistance and corrosion resistance are improved by 30 percent, the strength is improved by 5-10 times, the bias is reduced, the production consumption is lowered, the service life is prolonged by two times, the problem that the high-temperature highly corrosive materials are easily biased in the tower equipment is solved, and great contribution is made to the development of fluorine chemical industry and other petrochemical industries.

The invention belongs to the technical field of fluorochemical industry, and particularly relates to methods for preparing imidodisulfuryl fluoride and alkali metal salt thereof. The method for preparing imidodisulfuryl fluoride comprises the steps of mixing imidodisulfuryl chloride with ether-nHF complex, conducting stirring reaction for 1-20 h at 0-100 DEG C, and conducting reduced pressure distillation after reaction to obtain imidodisulfuryl fluoride. The method for preparing alkali metal salt of imidodisulfuryl fluoride comprises the step of mixing imidodisulfuryl fluoride with MF for reaction under ball milling to obtain a crude product of alkali metal salt of imidodisulfuryl fluoride, wherein reaction temperature is 10-30 DEG C, reaction time is 2-20 h, and M is Li, Ma or K. The technical scheme is safe, efficient and suitable for industrial production.

The invention relates to a method for continuously extracting and recovering polytetrafluoroethylene dispersed resin, which specifically comprises: placing PTFE waste residue containing paraffin wax with a water content not higher than 10% in an extractor for extraction treatment. The method of the invention has the characteristics of mild operating conditions, low cost, high yield, practicality and easy operation. It changes the current situation of waxy PTFE waste residue landfill faced by the fluorine chemical industry, realizes the effective reuse of resources, and has good social and economic benefits. After continuous extraction, the paraffin content in the final dispersed PTFE recycled material is ≦5%, and the paraffin recovery rate is ≧90%.

The invention discloses a block hole type graphite reboiler, which comprises a graphite block. A through material hole is arranged inside the graphite block from top to bottom, and a through steam hole is arranged inside the graphite block from left to right. The material hole and the steam The holes are arranged in a staggered manner and are not connected to each other. The graphite block is provided with a material hole and a steam hole formed in one body, and the two are arranged at staggered intervals and are not connected to each other, and there is a certain distance between them, so that the graphite block will not produce leakage between the material hole and the steam hole The block hole type graphite reboiler of the present invention has good temperature resistance and corrosion resistance, high strength, good sealing performance and long service life, effectively solving the problem of easy damage and leakage of the usual block hole type graphite reboiler , has made great contributions to the development of fluorine chemical industry and other petrochemical industries.

The invention belongs to the technical field of fluorochemical industry and particularly relates to a low-compression-deformation fluororubber premix and a preparation method thereof. The fluororubber premix is prepared from the following raw materials in parts by weight: 100 parts of modified crude fluororubber, 1.6-3.0 parts of a vulcanizing agent, 0.4-0.8 part of an accelerant, 0.5-2.2 parts of a release agent and 2.0-10.0 parts of a filling agent. A rubber compound prepared from the low-compression-deformation fluororubber premix is relatively low in permanent compression deformation rate and good in tensile strength. The preparation method is simple, feasible, and easy to realize.