196results about How to "Meet purity requirements" patented technology

The invention discloses a method for recovering salt from a waste water treatment system. The waste water is subjected to primary treatment by virtue of the processes such as oxidation, adsorption, precipitation, filtration, softening and CO2 removal in the steps (1) to (5); the running influence factors and effects of RO (reverse osmosis) in the step (6) are removed; meanwhile, the purity of subsequently extracted nitrate and salt is ensured; a set of step-by-step nitrate and salt separation process of warming, cooling and warming is provided in the steps (7) to (11); the extracted nitrate and salt are ensured to meet the purity requirements; and meanwhile, the processed liquid waste is subjected to secondary treatment. The invention also discloses a system for a process for recovering salt from the waste water treatment system. An energy conversion unit is arranged in the system; the heat in the nitrate and salt extracting processes is mutually converted and used; the energy utilization rate is increased; and resources are saved to the maximal limit.

The invention discloses a cryogenic separation system for separating a mixed gas. The system mainly comprises two parts, that is, a molecular sieve purification unit and a cold box of a cryogenic separation device, wherein the mixed gas at least containing carbon monoxide, hydrogen, methane and a small amount of nitrogen communicates with an inlet pipeline of the molecular sieve purification unit, the molecular sieve purification unit sequentially communicates with a first main heat exchanger, a tower bottom reboiler of a stripping tower, a tower bottom reboiler of a demethanizing tower, and a second main heat exchanger in the cold box of the cryogenic separation device through a first pipeline and then is connected to a middle inlet of a hydrogen separation tank after impurities easy to condense at a low temperature, of carbon dioxide, methyl alcohol and water, are removed, and three hydrogen-enriched gas pipelines are connected out from the top of the hydrogen separation tank and communicate with an external hydrogen-enriched gas collection system after a hydrogen-enriched gas is reheated by the two main heat exchangers to recover a cold quantity; and two liquid pipelines are connected out from the bottom of the hydrogen separation tank, one liquid pipeline communicates with a middle inlet pipeline of the stripping tower through a first throttle valve and the second main heat exchanger, and the other liquid pipeline communicates with an upper inlet pipeline of the stripping tower through a second throttle valve.

The present invention provides one method of raising the efficiency of stripping hydrocarbon converting catalyst and its equipment. According to the present invention, catalyst particle and strippingfluid are made to counterflow through one stripper with at least two layers of stuffing. The stuffing in the stuffing layers is crossed into diamond shaped grid plate parallel to the axis of the stripper. The stripper of the present invention has high efficiency. The present invention is especially suitable for catalytic conversion process of preparing olefin, the smoke impurity content in the regenerating agent is less than 0.05 vol%, and the stripper can be reduced in volume and equipment investment obviously.

The invention discloses a glucosylglycerol product and a purification method and application of the glucosylglycerol. The method comprises the following steps of 1, obtaining a low-permeability extract rich in GG(glucosylglycerol); 2, carrying out depigmentation treatment by adopting membrane filtration; 3, carrying out depigmentation treatment by adopting resin adsorption; 4, carrying out desalination by adopting membrane filtration; and 5, carrying out dehydration and concentration, specifically, carrying out dehydration on an obtained concentrated solution so as to obtain the purified glucosylglycerol product. The purification method has the advantages of being simple, safe, easy to operate and control, efficient, very suitable for industrial large-scale production and capable of improving the economic benefits.

Apparatus and processes are disclosed for economical separation of fluid mixtures utilizing perm-selective membranes. Broadly, apparatus of the invention comprises a plurality of membrane modules comprising a solid perm-selective membrane and means for controlling enthalpy of selected fluids within the apparatus. Advantageously, the membrane modules are disposed in a first product group, a second product group, and at least one intermediate group. Apparatus of the invention is particularly useful for simultaneous recovery of a very pure permeate product, and/or a desired non-permeate stream, from fluid mixtures of two or more compounds which when subjected to appropriately altered conditions of temperature and/or pressure exhibit a bubble point.

The invention relates to a synthetic method of ethyl methyl carbonate (EMC), and specifically relates to a method used for catalyzing dimethyl carbonate and diethyl carbonate with a solid super base so as to synthesize ethyl methyl carbonate. According to the method, the solid super base is taken as a catalyst; and high-selectivity catalyzing of dimethyl carbonate and diethyl carbonate is carried out; so that ethyl methyl carbonate is obtained via synthesis; the molar ratio of dimethyl carbonate to diethyl carbonate is 0.25-4:1; reaction temperature is lower than 150 DEG C; reaction is carried out at normal pressure; reaction time ranges from 1 to 3h; and catalyst amount accounts for 1 to 5% of the weight of the raw materials. The solid super base is taken as the catalyst; reaction time is short; selectivity is high; and EMC products with a purity required by lithium ion battery electrolyte can be obtained via simple distillation. Activity of the catalyst is high; and recycling of the catalyst after reaction can be realized.

The invention belongs to the technical field of lithium-ion batteries and particularly relates to an efficient method for preparing difluorophosphates. The method comprises the following steps: metering a hexafluorophosphate solution with the concentration being 5wt% to 50wt% and a cyclosiloxane or an acetal, then, introducing the metered materials to a microchannel reactor, carrying out a reaction for 60 to 900 seconds at the temperature of 20 DEG C to 150 DEG C, carrying out membrane filtration on an obtained reaction solution, and then, carrying out concentrating and drying, thereby obtaining a corresponding difluorophosphate product. The method disclosed by the invention has the advantages that the process route is simple, the raw materials are readily available, the reaction efficiency is high, the energy consumption is low, the product purity is high, and the like.

The invention relates to a method for purifying the silicon waste to prepare high purity silicon. The tailing material of massive monocrystal line silicon with the silicon content of more than 90 percent or pot material as raw material is treated by vacuum evaporation and directional condensation, refinement and purification. First, the raw material is heated to the temperature above the melting point of the raw material and carries out vacuum evaporation in the vacuum state with heat preservation to remove the volatile impurity, then, the raw material is stretched and cooled to carry out vacuum directional condensation, refinement and purification. Therefore, the metal impurities are collected at one end, which not only removes the non-metallic impurities but also removes the metallic impurities. The high purity silicon with purity of more than 99.999 percent can be prepared.

According to a method disclosed in the invention for increasing yield of rectisol and/or liquid oxygen wash greatly and saving energy through pressure swing adsorption technique, the desulfurized gas or transformed gas is divided into two branches. One branch enters a pressure swing adsorption decarburization device for decarburization, and the other branch enters a low-temperature methanol carbon washing device for decarburization. The decarburized gas after decarburization of the voltage swing adsorption decarburization device enters a voltage swing adsorption hydrogen purification device for obtaining hydrogen product, and a hydrogen-nitrogen synthesis gas is obtained after allocating the nitrogen. The decarburized gas after decarburization of the voltage swing adsorption decarburization device enters a liquid hydrogen washing device, and the hydrogen-nitrogen synthesis gas is obtained after purification. After mixing the two branches of hydrogen-nitrogen synthesis gas and compressing the mixture in a synthesis gas compressor, the compressed gas enters an ammonia synthesis period. The invention also discloses a device for realizing the method. A yield increase amplitude which is higher than 50% can be realized according to the invention.

The invention relates to the field of extraction and purification of plant effective components, in particular to a method for preparing shikimic acid from folium ginkgo extraction waste liquor. The method comprises the following steps: carrying out enzymolysis on the folium ginkgo extraction waste liquor; and collecting an enzymatic hydrolysate, filtering by an organic membrane, carrying out adsorption elution by an anion exchange resin column, concentrating, crystallizing and drying. The method is simple to operate, economical and practical and proper to popularize, and does not need an organic solvent. Moreover, the obtained shikimic acid is high in purity and good in appearance condition, and the mass content is greater than 99%.

The invention provides a method for separating magnesium and lithium in salt lake brine and producing magnesium hydroxide and high-purity magnesium oxide.According to the method, the salt lake brine is subjected to solar evaporation and filtration to remove insoluble impurities, and then an old brine solution is obtained; an alkaline solution and the old brine solution are mixed for a precipitation reaction or fully back-mixed in a colloid mill for quick precipitation and then transferred into a reactor to be crystallized at proper temperature; filtration and drying are carried out to obtain Mg(OH)2 with the purity higher than 99%; roasting is carried out to obtain a solid magnesium oxide product with the purity higher than 99%.Filtrate is evaporated and concentrated to obtain a lithium-rich solution which can be directly used for preparing a lithium carbonate product.By the adoption of the reaction-separation coupling technology, nanoscale magnesium hydroxide and the high-purity magnesium oxide product are produced while magnesium and lithium in the salt lake brine are separated.The loss rate of lithium is small (smaller than 10%), the yield is high (larger than 90%), the separation process is simple, and prepared magnesium hydroxide is high in purity.

The invention provides an alumina-silica drainage agent and a preparation method thereof and belongs to the field of amorphous surface fireproofing materials for steelmaking industries. According to the technical scheme, the alumina-silica drainage agent is prepared from pottery cinnabar with the granularity of 0.5-1.2mm, desert silica sand with the granularity of 0.3-0.9mm, flake graphite with the granularity smaller than or equal to 75 mu m, and an adhesive. The preparation method includes first drying the pottery cinnabar and the desert silica sand, adding the flake graphite and the adhesive, and performing stirring in a barrel type stirrer to prepare the alumina-silica drainage agent. The alumina-silica drainage agent is clean, environmentally friendly, and capable of effectively increasing a pouring rate of a product to above 98%, meanwhile substantially reducing product costs, effectively reducing discharge of exhaust gases and dust, and meeting requirements for product qualities, prices and steel liquid purity degrees in present steel industries.

The invention provides an extraction method of zizania latifolia protein in the interaction of zizania latifolia and zizania smut, which simulates the interaction between zizania latifolia and zizania smut, to extract zizania latifolia gene groups and proteins which are not mixed. The invention can prepare the zizania total protein product without the protein of zizania smut, whose protein content is high, impurity content is low and nucleic acid content is low, thereby satisfying the demand of two-dimensional electrophoresis to protein purity.

The invention discloses a method for preparing high-purity 4,4'-difluorobenzophenone. p-fluorotoluene is used as an initial raw material and oxidation reaction, chloroformylation reaction and condensation reaction are carried out, so that the target product 4,4'-difluorobenzophenone is finally obtained; the melting point of the product is 107-109 DEG C; the purity of the product is greater than or equal to 99.9 percent and accords with the purity requirement for synthesis of polyether-ether-ketone (PEEK). Moreover, according to the preparation method disclosed by the invention, the used raw material is cheap and is easy to obtain, the synthetic process conditions are mild and in the synthesizing process, a used reagent is relatively green and environmental-friendly, and thus, the method has wide application prospect and high industrial value.

The present invention relates to a directly compressible magnesium hydroxide carbonate and to a process for the preparation thereof, and to the use thereof.

The invention relates to a heavy oil separation method which comprises the step of making heavy oil contact the stationary phase of silica silica loading with silver ion. The method can be used for preparing the components of the saturated hydrocarbon and the aromatic hydrocarbon through separating the heavy oil into three parts including saturated hydrocarbon, aromatic hydrocarbon, and colloid. The invention has the advantages of high separation efficiency and high handling capacity.

The invention relates to a crystallization and purification process of high-purity ethylene carbonate, and mainly solves the technical problems of high energy consumption, low product purity, low yield and the like when ethylene carbonate is separated and purified in the prior art. According to the technical scheme, the method comprises the following steps: a raw material containing ethylene carbonate is introduced into a static crystallizer for primary static crystallization and sweating; and while a high-purity ethylene carbonate crystal product is obtained, an obtained crystallization mother liquor and a sweating sweat are continuously introduced into a static crystallizer with the same structure to carry out secondary static crystallization and sweating, so that the technical problemsare better solved, and the method can be applied to industrial production of ethylene carbonate, especially power battery grade ethylene carbonate.

The invention discloses an ionic liquid with 1-isobutyl-3-methylimidazole structure and the preparation method and the application among biological transesterification reaction, belonging to technical field of organic compound preparation and application. The preparation method is characterized in that: equimolar methylimidazole and bromination isobutene are mixed directly and reacted for 18 hours at the temperature of 60 DEG C before heated slowly to 85 DEG C for continuous reaction until the reaction system is changed into sticky transparent liquid; double decomposition reaction is made for 1-isobutyl-3-methylimidazole bromide salt and equimolar inorganic salt containing different anions to get each kind of ion liquid crude product (the anion comprises PF6[-] and N(CF3)2)[-]. When the ion liquid crude product cannot be detected by bromine ion using super-pure water washing, acetone with five times of volume is used for dilution (the viscosity is close to water); active carbon and silica gel are respectively adopted for decoloration before vacuum distillation is made to remove acetone and non-reactant, thereby getting colorless products. The the preparation method for ionic liquid with 1-isobutyl-3-methylimidazole structure has the advantages of simple preparation technique, environmental protection, low cost, high purity for the ion, and thus can be applied in spectrum study and biocatalysis reaction.

The invention discloses a separation analyzing method for nitrogen-containing compounds in heavy oil. The separation analyzing method includes: preparing a solid phase of a solid-phase extraction chromatographic column; separating alkaline components from non-alkaline components with a solid-phase extraction chromatography; analyzing the separated components by the aid of Fourier transform ion cyclotron resonance high-resolution mass spectra. Low solid phase to oil weight ratio, less flushing solvent dosage, shorter time and less manpower are needed in the method; compared with an existing method, the separation analyzing method has the advantages of higher separation efficiency, better separation effect and higher sample throughout, the method can be used for separation to meet the requirements of sample purity for subsequent analysis and preparing the nitrogen-containing compounds in the heavy oil rapidly to provide necessary sample quantity for subsequent reaction and evaluation experiment, and meanwhile, separation effect evaluation and product composition analysis can be achieved from the molecular level by the aid of the Fourier transform ion cyclotron resonance high-resolution mass spectra.