9results about How to "Reduce regeneration frequency" patented technology

The invention discloses an adsorption coupling contact precipitation defluorination system and a defluorination method, and the method comprises the following steps: feeding fluorine-containing mine water into a defluorination reaction tank, and carrying out adsorption defluorination on the fluorine-containing mine water through a defluorination filter material layer to obtain first defluorination mine water; feeding the calcium agent and the phosphorus agent according to the formula ratio into a fluorine removal reaction tank, removing fluorine through a catalytic reaction to obtain second fluorine-removed mine water, and then feeding the obtained second fluorine-removed mine water into a clean water tank; when the head loss of the second defluorination mine water exceeds a threshold value, feeding backwashing water and backwashing air into a defluorination reaction tank, and backwashing a filter material in a defluorination filter material layer; feeding the regenerated liquid into a defluorination reaction tank, soaking a defluorination filter material layer for 10-12 hours, and then discharging generated waste liquid into a lime reaction tank. According to the method disclosed by the invention, through adsorption, contact precipitation and regeneration, the carbon-based apatite adsorbed with fluorine ions in the defluorination reaction tank is used as a seed crystal for subsequent contact precipitation, so that the service time of a filter material in a defluorination filter material layer is effectively prolonged, and the regeneration frequency of the filter material is reduced.

The invention belongs to the technical field of organic chemistry, and in particular to a method for preparing cis-1,3,3,3-tetrafluoropropylene. The method for preparing cis-1,3,3,3-tetrafluoropropylene provided by the present invention, comprises the following steps: using trans-1,3,3,3-tetrafluoropropylene as raw material, under the action of light source and silicon dioxide supported phosphomolybdic heteropoly acid catalyst, promoting trans-1,3,3,3-tetrafluoropropylene to undergo photochemical reaction, and obtaining cis-1,3,3,3-tetrafluoropropylene. The method for preparing cis-1,3,3,3-tetrafluoropropylene provided by the present invention is simple to operate, and thermodynamic limitations can be broken through by photoreaction, so that the conversion rate of trans-1,3,3,3-tetrafluoropropylene is high, and the selectivity and yield of cis-1,3,3,3-tetrafluoropropylene are high, and the service life of the silicon dioxide supported phosphomolybdic heteropoly acid catalyst obtained by the present invention is relatively long, which is conducive to continuous production.

The invention relates to an integrated recovery process of aromatic hydrocarbons in hydrogen peroxide oxidation tail gas, which specifically comprises the following steps: preheating the oxidation tail gas to 95-115 DEG C, introducing the oxidation tail gas into an adiabatic expansion machine for adiabatic expansion, reducing the pressure to 0.1-0.15 MPa, suddenly reducing the temperature to 3-7 DEG C, realizing energy recovery and power generation by using the Joule-Thomson effect, and condensing and separating out most aromatic hydrocarbons; and the condensed tail gas enters the activated carbon adsorption tower for deep adsorption, so that the aromatic hydrocarbon content in the finally discharged tail gas is less than or equal to 70mg / m. Through cooperation of process units, efficient recovery of aromatic hydrocarbons (the total recovery rate is greater than or equal to 95%), self-sufficiency of energy and even negative energy consumption operation (the unit tail gas treatment energy consumption is-5-0 kW.h / 1000 m) are realized, the stability and economical efficiency of an adsorption system are remarkably improved, and the technical problems of high energy consumption, low recovery rate and poor adsorption stability of a traditional cooling and adsorption process are solved.

The application provides a system treatment process for fluorine-containing wastewater, which comprises the following steps: a fluorine-containing wastewater treatment process, a sludge treatment process, a defluorination filter material regeneration process and a sludge waste liquid treatment process. The system treatment process for fluorine-containing wastewater has the advantages of low sludge yield, low flocculant consumption, low treatment cost, high adsorption capacity, greatly prolonged adsorption time of the adsorbent, reduced regeneration frequency, no discharge of regeneration liquid, and effectively solved problem of difficult treatment of by-products of traditional treatment processes.

The invention provides an SDPF system based on a particle collecting device and a control method thereof.The SDPF system comprises the particle collecting device, the particle collecting device comprises an aggregation filter AF (103) and a cyclone particle collector CPC (100), the aggregation filter AF (103) receives tail gas discharged from the upstream and filters particulate matter in the tail gas, and the cyclone particle collector CPC (100) is connected with the aggregation filter AF (103) and the cyclone particle collector CPC (100). After the particulate matters retained in the aggregation filter AF (103) are aggregated into larger particulate matters, the larger particulate matters are discharged from the aggregation filter AF (103); a cyclone particulate matter collector (CPC) (100) is arranged at the downstream of the aggregation filter AF (103) and is used for capturing and treating the particulate matters discharged from the aggregation filter AF (103); the control method is realized by adopting the system.

The invention discloses a method and a device for purifying reducing gas from blast furnace or converter gas. The method comprises a raw material gas pretreatment process, a CO2 gas removal process and a reducing gas CO purification process. And returning the reducing gas to a blast furnace to participate in a metal smelting reaction process or be used for synthesizing an organic chemical product. The method disclosed by the invention is beneficial to reducing carbon emission, and has the advantages of saving operation cost and being low in equipment investment, the equipment is mutually coupled, a residual pressure recovery system is utilized and transformed to recover pressure energy contained in the emptied gas, and cold energy is utilized to cool the feed gas through heat exchange, so that the production efficiency is improved. And finally, carrying out flushing desorption or vacuumizing and flushing desorption on the desorption of the pressure swing adsorption decarbonization device by taking the gas as flushing gas.

The invention belongs to the field of boron trifluoride purification, and discloses a method and device for removing carbon dioxide in boron trifluoride-11 and an adsorbent regeneration method.The removing method comprises the steps that 1, an absorbent is fed into an absorption device, and the adsorption device is filled with the adsorbent; (2) carrying out purging replacement and evacuation treatment on the device until the content of CO2 in the device is qualified; (3) introducing the boron trifluoride-11 raw material gas into an absorption device, absorbing carbon dioxide by an absorbent in the absorption device in a spraying manner, and after absorption, introducing the gas into an adsorption device filled with the absorbent to adsorb carbon dioxide; the absorbent is an imidazole tetrafluoroborate ionic liquid, an imidazole amino acid salt ionic liquid or a pyridine tetrafluoroborate ionic liquid; the adsorbent is prepared by using a 13X molecular sieve as a carrier and loading an ionic liquid by using an equivalent-volume impregnation method, the loading capacity of the ionic liquid is 10wt%-30wt%. The removal method is simple, the impurity removal efficiency is high, and the absorbent is regenerated in situ.

The invention relates to the field of biology, and discloses a method for improving the purity of 6-SL, which comprises the following steps: inactivating fermentation liquor, performing microfiltration to remove thalli, performing enzymolysis and color removal by using lactase, and simultaneously adding divalent metal salt to precipitate impurities and active carbon to remove pigments; separating impurities and concentrating a target product by adopting ultrafiltration and nanofiltration in sequence; further purifying through electrodialysis desalination and ion exchange; and finally, carrying out evaporation concentration, secondary decoloration and spray drying to obtain a high-purity and high-whiteness 6-SL finished product. Through key steps of optimizing electrodialysis pH, ion exchange resin types, regeneration frequency, powdered carbon decoloration conditions and the like, impurities and pigments are effectively removed, the purity (greater than or equal to 80%) and whiteness of the product are improved, meanwhile, the loss rate is remarkably reduced, and the average recovery rate of the product reaches 80% or above. The method is simple and efficient in process flow, has the characteristics of low energy consumption and low pollution, and is suitable for large-scale industrial production of 6-SL.