549results about How to "Avoid fouling" patented technology

A down hole flow control tool for use in a well bore, such as a bridge or frac plug, includes back-flow vent holes in a central mandrel and initially covered by a member on the mandrel, such as a lower slip or a lower cone. In a subsequent, set configuration, the member moves away from the vent hole allowing back flow of well fluids.

The present invention provides a manufacturing method for polypeptides that are produced in insect cells using a baculoviral expression system. In one example, the insect cell culture is supplemented with a lipid mixture immediately prior to infection (e.g., one hour prior to infection). The polypeptides are isolated from the insect cell culture using a method that employs anion exchange or mixed-mode chromatography early in the purification process. This process step is useful to remove insect-cell derived endoglycanases and proteases and thus reduces the loss of desired polypeptide due to enzymatic degradation. In another example, mixed-mode chromatography is combined with dye-ligand affinity chromatography in a continuous-flow manner to allow for rapid processing of the insect-cell culture liquid and capture of the polypeptide. In yet another example, a polypeptide is isolated from an insect cell culture liquid using a process that combines hollow fiber filtration, mixed-mode chromatography and dye-ligand affinity in a single unit operation producing a polypeptide solution that is essentially free of endoglycanase and proteolytic activities. In a further example, the isolated polypeptides are glycopeptides having an insect specific glycosylation pattern, which are optionally conjugated to a modifying group, such as a polymer (e.g., PEG) using a glycosyltransferase and a modified nucleotide sugar.

The invention belongs to the technical field of water treatment, and particularly relates to a coking wastewater membrane concentration salt separation zero-emission treatment system and a coking wastewater membrane concentration salt separation zero-emission treatment method. The method comprises: coking wastewater pretreatment, wherein the coking wastewater pretreatment comprises full-automaticsand filtration, active carbon adsorption regeneration, ultra-filtration and softening; membrane salt separation and concentration treatment, wherein the membrane salt separation and concentration treatment comprises low-pressure nano-filtration, high-pressure nano-filtration, purification nano-filtration and reverse osmosis treatment; and concentration treatment, fluorine and silicon removal, electrodialysis concentration and evaporative crystallization, wherein an industrial-grade sodium chloride product with a purity of more than 92% is obtained, a sodium sulfate concentrated solution enters a freezing crystallization device to generate mirabilite, the mirabilite is heated and melted and then enters an evaporation crystallization, centrifugation and drying system, and an industrial-grade sodium sulfate product with a purity of more than 95% is obtained. According to the invention, with the system and the method, the zero discharge of coking wastewater is achieved, and the process technology is an innovative coking wastewater zero discharge process at home and abroad.

The invention relates to a cellulose nanofiber-graphene oxide hybridized composite ultrafiltration membrane and a preparation method thereof. The cellulose nanofiber-graphene oxide hybridized composite ultrafiltration membrane structurally comprises at least one cellulose nanofiber and graphene oxide hybridized filtering layer, and at least one micro-filtration membrane supporting layer or electrostatic spinning nanofiber supporting layer. The composite ultrafiltration membrane has the good anti-pollution scaling property and pressure-resistant property when being used in oil-water separation process; compared with a commercial membrane, the composite ultrafiltration membrane has water flux 2-10 time that of the commercial membrane under a condition of same reject rate.

A reverse-osmosis separating membrane with high resitance to scale deposit is prepared through hydrolyzing Ti compound in acidic aqueous solution to generate TiO2 nanoparticles, dispersing them in anaqueous solution (pH=1-6 or 9-13), and dipping the reverse-osmosis separating membrane in it for fixing said TiO2 nanoparticles on it.

The invention provides a method used for processing waste water after vanadium precipitation. The processing method leads the waste water after vanadium precipitation to process in a straight line in a whole processing system, the waste water after vanadium precipitation flows unidirectionally in the whole process of putting into a segregation processing, thereby not only being capable of avoiding pollution of the waste water on environment, also being capable of avoiding problems such as equipment scaling blockage, erosion and the like brought by circular process after enrichment of different ions in a crystal residual liquid, and observably improving the waste water treatment ability of a system. The waste water carries out a first crystal and a second crystal after evaporation concentration, is capable of comparing a sodium sulfate constituent and an ammonium sulfate constituent in fully segregation sinking vanadium waste water, and recovers to obtain sodium sulfate crystal and ammonium sulfate crystal with higher purity.

The invention relates to a zero emission treatment method of high-salinity wastewater. The method comprises a pre-treatment technology of wastewater, a reduction technology of the wastewater and an evaporative crystallization technology of the high-salinity wastewater, wherein the pre-treatment technology is implemented as follows: a flocculation and/or sedimentation chemical agent is added, heavy metal ions, hard ions and organic substances in the high-salinity wastewater are removed from a chemical reactor, and the pH of the wastewater is adjusted until the wastewater is alkaline; the reduction technology is implemented as follows: the pretreated wastewater is subjected to preliminary reduction treatment through a medium-pressure reverse osmosis device and a high-pressure reverse osmosis device to form high-pressure reverse osmosis concentrated water, the high-pressure reverse osmosis concentrated water is subjected to deep concentration treatment through a primary electric drive ionic membrane device and a secondary electric drive ionic membrane device, high-salinity concentrated water is obtained through concentration, and producing water in the reduction process is recovered to a recycling water tank; the evaporative crystallization technology is implemented as follows: salts in the high-salinity concentrated water are recovered under the negative pressure or micro-positive pressure condition through a nitrate evaporative crystallization device and a salt evaporative crystallization device, and sodium sulfate and sodium chloride are formed.

The invention provides multifunctional catalytic cracking strengthening additive which comprises a rare earth organic compound, heteropoly acid (and salt thereof), chemical inhibitor, solvent, and the like and has the functions of resisting oxidation and preventing from scorch, dispersing, increasing the acid center, passivating the metal, and the like. When being added into a catalytic cracking lifting pipe reactor, the multifunctional catalytic cracking strengthening additive can inhibit the generation of secondary reaction such as thermal cracking reaction, dehydrogenation condensation reaction, and the like, reduces the generation of side products of net gas, coke, hydrogen, and the like, and improves the yield coefficients of products with high added values, such as liquid gas (especially propylene), gasoline and diesel. The catalytic cracking strengthening additive has the function of metal deactivator and can replace the metal deactivator, therefore, the metal deactivator needs not to be added after the catalytic cracking strengthening additive is added. The invention has the function of resisting oxidation and preventing from scorch, can inhibit a lifting pipe and a settling vessel from being coked and prevent a reaction system from scale deposit, thereby being multifunctional catalytic cracking strengthening additive.

The invention relates to a rotary type shaver with a head part capable of omnidirectionally floating, which belongs to a personal care product. The prior rotary type shaver with a floatable shaving surface has the defects that are not easily overcome in shaving speed and shaving comfort level. The rotary type shaver with the head part capable of omnidirectionally floating comprises the head part and a body, wherein the head part comprises a screen head and a screen head seat and is in structural connection with the body through the screen head seat; the screen head is provided with at least one shaver set and also provided with an attaching surface and a shaver seat supporting piece which are matched with the shaver set; the shaver set comprises an outer cutter which forms a shaving surface and an inner cutter which can be driven and perform rotary movements relative to the outer cutter; the screen head seat of the head part is connected with the body through an elastically combined connection mechanism which comprises a shaver shaft component and a supporting spring; meanwhile, a screen head seat shell and a body shell realize the structure inosculation through the same curvatureswhich are mutually matched and the same radius concave and convex spherical surfaces so as to ensure that the head part can float omnidirectionally relative to the body, thus a user can obtain fast and comfortable shaving feelings.

The invention relates to a zero discharge process for high-salt wastewater discharged from titanium dioxide production, and the steps are as follows: high-salt wastewater, removal of silicon by a magnesium agent, medicinal agent softening, high-density precipitation, immersion-type ultrafiltration, brackish water reverse osmosis membrane concentration, seawater desalination reverse osmosis membrane concentration, reduction of COD by catalytic oxidation, ion exchange softening, multi-stage nanofiltration salt separation, high pressure reverse osmosis membrane concentration, DTRO/ED electrodialysis concentration, and evaporation crystallization/freezing crystallization. The zero discharge process adopts corresponding treatment processes separately, realizes for the first time the zero discharge of the high-salt wastewater of titanium dioxide by a detailed control technology of each specific process in the system, ensures the normal and smooth operation of the system, and recovers a largeamount of fresh water resources and industrial salts. The purpose of resource recycling of the titanium dioxide production wastewater is realized, and on the basis of creating of certain economic benefits, significant environmental and social benefits are reflected.

The present disclosure relates to a method for polymerizing polypropylene, optionally with one or more additional comonomers in a gas phase reactor in the presence of a mixed electron donor system comprising at least one selectivity control agent and at least one activity limiting agent. The process involves controlling the polymerization process to ensure that the difference between the reactor temperature and the dew point temperature of the incoming monomer stream is 12° C. or greater.

The invention relates to an advanced treatment system for municipal domestic wastewater, and in particular relates to an advanced treatment system and method for municipal domestic wastewater. The advanced treatment system for the municipal domestic wastewater comprises a water inlet pipe and a water outlet pipe, as well as a composite lift bed bio-membrane reactor, a flocculation reactor, a compression type filtering material filter, a chemical dosing device and an aerating apparatus, wherein the aerating apparatus is used for ventilating the composite lift bed bio-membrane reactor, the flocculation reactor and the compression type filtering material filter. According to the advanced treatment system for the municipal domestic wastewater, the treatment effect can be improved; the technological process and the structure arrangement are simplified; the management and operation strength is reduced; and the floor area and the operation cost are reduced.

The invention relates to a process and a system for filtering and squeezing wastewater. The system comprises a sludge inlet system, a sludge blow-drying system, a septum squeezing system, a filter cloth cleaning system and a matched electric control system. An outlet of a wastewater pool is communicated with a feed inlet of a feed pump through a feed conveying pipe; a discharge port of the feed pump is respectively communicated with feed inlets at two sides of a filter press through the feed conveying pipe and a feed valve; an outlet of an air compressor is communicated with an air inlet of an air storage tank; an air outlet of the air storage tank is respectively communicated with an air inlet of the filter press through an air pipe and a back flushing valve; the feed conveying pipe between the feed valve and the filter press is provided with a pressure sensor; the signal end of the pressure sensor is connected with the signal end of a PLC controller; an inlet of a press pump is connected with a water storage tank; and an outlet of the press pump passes through a squeezing pipeline and is connected with a main squeezing pipe of the filter press through a tee valve. The process and the system have the following advantages: 1, the process and the system have time conservation, high efficiency and low energy consumption; and 2, the process and the system can effectively squeeze out moisture remained in a filter cake, completely carry out back flushing on materials in a feeding pipeline to a material pool and achieve the aims of cleanness and smoothness of the pipeline.

The invention relates to a method for jointly producing sulphuric acid and cement clinker by using sulphur gas to reduce gypsum. The method comprises the steps of preparing high-temperature sulphur gas, proportioning and preheating raw materials, reducing gypsum, preparing cement clinker by using gypsum reduction products, preparing sulphuric acid by using tail gas and the like. The method disclosed by the invention has complete technology, the purity of the sulphur gas component can be kept at 95-100%, maximal conversion efficiency of calcium sulfate in a calcining kiln is effectively controlled by controlling the optimal conversion ratio of calcium sulfate into calcium sulfide in a reduction furnace at 25-27%, and the calcination is convenient to control; and the method has the advantages of simple technological procedure, high practicality of system control indexes, convenient operation and management, low investment of equipment, low energy consumption, high automation degree and the like.

The invention discloses a rotational flow and turbulent swirl ball flue gas purifying tower, which comprises a tower body, a driving device, a turbulent swirl ball layer, a rotating-stream tray layer and peripheral devices, and is characterized in that the turbulent swirl ball layer and the rotating-stream tray layer are arranged in the same tower body and are distributed up and down; a center pipe is vertically arranged at the middle part of the turbulent swirl ball layer and the rotational flow ply and is connected with the driving device. The rotational flow and turbulent swirl ball flue gas purifying tower can be used for debusting, desulfurizing, demist, washing and cooling the flue gas, has reliable performance, favorable adaptability, high desulfurization efficiency, simple operation, saved cost and convenient the maintenance, also avoids the scale blockage and has good popularization value.

The invention belongs to the field of atmosphere environmental protection, and particularly discloses a desulfurization process and device based on out-of-tower circulation and independent oxidization dual-alkali methods. In the process, an out-of-tower circulation process is adopted, wherein an absorption tower is separated from a circulating pool, circulating fluid is extracted by a circulatingpump from the circulating pool which is arranged outside the tower and sprayed into the tower, and smoke rises from the inside of the tower and comes into contact with the circulating fluid to removesulfur dioxide; and the cleaned circulating fluid is drained to the circulating pool through a drainage port at the bottom of the tower, so that the whole out-of-tower circulation process is completed. The desulfurization process has high desulfurization efficiency, long stable operation time, low operation cost and high purity of product gypsum, can be used for effectively preventing the absorption tower from scaling and being blocked, and is suitable for wide popularization and application.

A process and apparatus is provided for reduction of dissolved oxygen content in seawater from about 8 ppm in the feed seawater to about 10 ppb or less. Significant advantages are achieved by: use of a separator in horizontal alignment to provide high gas-liquid contacting area for separation and de-entrainment within the separator, thereby providing higher throughput; and heating seawater to at least 30° C. and up to 60° C., so as to enhance removal of oxygen from seawater; use of once-through fuel gas as stripping gas and its subsequent combustion for heating the seawater provides for high efficiency and reduction of fouling. The combination of these features allows the amount of residual oxygen in deoxygenated seawater to be reduced to below 10 ppb and as low as 2 ppb.

The invention belongs to an environment technical sphere, concretely relates to a postposition waste water disposal method of an atalytic iron electrolytic cell. When suspended solid of waste water SS>=100mg/L or pH values of waste water >=9.0, or both, during the process of biochemical pretreatment to waste water, setting the cell before the biochemical basin, making waste water pass through the biochemical basin, a sedimentation basin, the cell, coagulating sedimentation basin, making water quality of outlet water reach emission standard, using the invention to deal with waste water, scaling phenomena of iron filtering material in the cell are avoided totally, so that water treatment effet of electrolytic process in the cell is insured. It is effective that electrolytic process is taken as the pretreatment process of non-biodegradation and organic waste water in atalytic iron, and the invention makes the electrolytic process have more application area and pushes performance of a project.