151results about How to "Low molar ratio" patented technology

A mixed matrix membrane is provided which comprises a continuous phase organic polymer and small pore alumina containing molecular sieves dispersed therein. The molecular sieves have a silica-to-alumina molar ratio of less than 1.0, more preferably, less than 0.3, and most preferably less than 0.1. In some cases, the molecular sieves have no appreciable amounts of silica. Exemplary compositions include aluminophosphates (AIPO) and silicoaluminophosphates (SAPO). When these molecular sieves are properly interspersed with a continuous phase polymer, the membrane will exhibit a mixed matrix membrane effect, i.e., a selectivity increase of at least 10% relative to a neat membrane containing no molecular sieves. The molecular sieves have pores with a largest minor crystallographic free diameter of 4.0 Angstroms or less. The molecular sieves may be selected from the group having IZA structure types including AEI, CHA, ERI, LEV, AFX, AFT, and GIS. Examples of preferred molecular sieves include: AIPO-18, SAPO-18, AIPO-34, SAPO-34, SAPO-44, SAPO-47, AIPO-17, SAPO-17, CVX-7, SAPO-35, SAPO-56, ALPO-52, and SAPO-43. Finally, methods for making and using such mixed matrix membranes to separate gases from a mixture containing two or more gases are also disclosed.

The invention relates to a quick and efficient non-template agent hydro-thermal synthesizing method. The system can synthesize an alpha-molybdenum trioxide nanometer rod and a high-density echinoid molybdenum oxide based nanometer materials. Molybdenum peroxide acid prepared from molybdenum trioxide and aqueous hydrogen peroxide solution is used as a precursor, is produced into scattered alpha-molybdenum trioxide nanometer rod by hydro-thermal synthesis at a temperature of between 80 and 180 DEG C, and is produced into the peroxide modified molybdenum oxide hydrate by hydro-thermal synthesis at a temperature of between 65 and 75 DEG C. The hydrate is a multiscale structure; a nanometer thin slice, a micron prism and a nanometer rod-shaped structure unit are divergently assembled into a micron-size high-density echinoid structure. The hydrate is roasted to obtain high-density echinoid alpha-molybdenum trioxide. Modulation of the synthesizing condition can realize fine adjustment for appearance of the nanometer rod, the micron-size echinoid structure and the structure unit thereof. The method uses raw materials with low cost, has the advantages of simple technical process, controllable conditions and the like, and can promote research and application of the molybdenum oxide in the fields of sensors, field transmission, electrode materials and so on.

A pressurized transport oxy-combustor with different configurations is disclosed. Substantially pure oxygen is fed to the transport oxy-combustor under pressure to combust fossil fuels, generating steam for power generation. The end product is the flue gas containing substantially pure CO₂ after moisture condensation. The low excess oxygen necessary to achieve complete combustion in the combustor is scavenged by adding another fuel so that substantially all oxygen fed to the combustor is completely consumed. The capability to operate the transport oxy-combustor as a circulating fluidized bed combustor at very high solids circulation rates makes it unnecessary to use recycled CO₂ or flue gas as a means to moderate and control the combustion temperature. The temperature in the combustor is effectively controlled by relatively cooler circulating solids that enter the combustion zone. A small amount of CO₂ is recycled for aeration and to convey solids fuel to the combustor.

The invention discloses a preparation method of N-acyl acidic amino acid or a salt thereof. According to the preparation method, fatty acyl chloride and an amino acid are subjected to an amidation reaction under an alkaline condition. The preparation method is characterized in that in the amidation reaction, water is used as a solvent, an acidic amino acid or a salt thereof is used as a main raw material and a small amount of a neutral amino acid or a salt thereof is used as an auxiliary raw material. The preparation method comprises the following steps: under a stirring condition, dropping the fatty acyl chloride into the aqueous solution of the acidic amino acid or the salt thereof; adding an alkali to adjust the pH value of the reaction solution; after a certain amount of fatty acyl chloride is dropped, adding the aqueous solution of the neutral amino acid or the salt thereof, continue to drop the fatty acyl chloride until the dropping is finished and stirring to maintain the reaction. According to the preparation method, the mixed amino acid and the fatty acyl chloride react under a water-phase system, so that the conversion rates of the mixed amino acid and the fatty acyl chloride can be remarkably increased and the amount of residual amino acids is greatly reduced. The product can be directly used as a surfactant after being treated simply, and thus the cost is greatly reduced.

The invention relates to a preparation method for a low-cost environmentally friendly (low formaldehyde release) larch bark pyrolyzed oil modified phenol-formaldehyde resin adhesive for manufacturing wood composite material. According to the invention, larch bark quickly pyrolyzed oil is used to replace 40 percent of the dosage of phenol, and the pyrolyzed oil modified phenol-formaldehyde resin adhesive is prepared by the means of adding pyrolyzed oil at the middle period to control a mild reaction temperature, and adding formaldehyde and sodium oxide batch by batch. Testing results show that: compared with pure phenol-formaldehyde resin, the modified phenol-formaldehyde resin with a pyrolyzed oil substitution rate of 40 percent can reduce the raw material cost by 33 percent and meet the production requirements of plywood and particle boards; the larch bark pyrolyzed oil modified phenol-formaldehyde resin adhesive reaches GB requirements and makes the formaldehyde release reach the environmental protection requirements of E1 grade and even reach the environmental protection standards of E0 if required; and if the particle boards adopt the pyrolyzed oil modified phenol-formaldehyde resin for glue application layer by layer, the thickness of a surface procuring layer can be effectively reduced.

The invention provides a melamine-urea-formaldehyde copolycondensation resin type formaldehyde catching agent which is made of urea, melamine and formaldehyde by means of copolycondensation reaction, wherein the final molar ratio F/U of the formaldehyde to the urea is 1:2.4-4.0, the formaldehyde is added once, the urea is added twice, the reaction temperature ranges from 85 DEG C to 95 DEG C, and the reaction time is 2-3 hours. The formaldehyde catching agent can be mixed and used with various urea resin adhesives and especially applicable to urea resins prepared with low molar ratio of the formaldehyde to the urea. Strength of main adhesives of urea resins is unaffected within a certain weight addition proportional range. The melamine-urea-formaldehyde copolycondensation resin type formaldehyde catching agent has the advantages of flexibility in use, high comprehensive performances and the like and is applicable to production of various indoor artificial boards.

The invention discloses a preparation method of high-viscosity polytrimethylene terephthalate. The preparation method of high-viscosity polytrimethylene terephthalate comprises the following steps: mixing: preparing polyterephthalic acid and 1,3-propanediol into a slurry under atmospheric pressure; primary esterification: continuously delivering the slurry into a first esterification kettle, and carrying out primary esterification reaction to obtain a first esterification product; secondary esterification: delivering the first esterification product into a second esterification kettle, and carrying out secondary esterification reaction to obtain a second esterification product; pre-polycondensation: continuously delivering the second esterification product into a pre-polycondensation kettle, and carrying out polycondensation to remove small molecules, thereby obtaining a polytrimethylene terephthalate prepolymer; and final polycondensation: continuously delivering the polytrimethylene terephthalate prepolymer into a final polycondensation kettle, and carrying out condensation polymerization to remove small molecules, thereby obtaining the polytrimethylene terephthalate high polymer. The invention also discloses a preparation method of the high-viscosity polytrimethylene terephthalate copolyester. The products have the advantages of high inherent viscosity and high quality.

The invention provides a processing technology for a routing plate, comprising the processing steps as follows: chipping and selecting of wood, pre-steaming and steaming, fiber separation, preparing the E1-class urea-formaldehyde, preparing the curing agent, adding the urea-formaldehyde, curing agent and paraffin, drying the fiber of the added the urea-formaldehyde, curing agent and paraffin, uniformly paving the dried wood fiber and smoothly pre-pressing the wood fiber under the pressure of 3.0-5.0MPa, heat pressing under the temperature of 180-185 DEG C, cooling, quenching and tempering, sanding and sawing, classifying and packaging. The plate prepared by the process has reasonably distributed density, moderate strength and low release quantity of formaldehyde.

The invention discloses a preparation method for a titanium-based low-precious-metal-content oxide coating anode. The preparation method comprises the following steps of: performing sand blasting and polishing treatment on a titanium substrate, removing oil stain, and putting into deionized water for performing ultrasonic cleaning; preparing chloro-iridic acid, ruthenium trichloride, trichloride antimony and tin tetrachloride into a masking liquid under the condition that the mole percent of chloro-iridic, ruthenium trichloride or a mixture of chloro-iridic and ruthenium trichloride is 2.5-30 percent, the mole percent of trichloride antimony is 10-15 percent and the mole percent of tin tetrachloride is 60-87.5 percent, coating onto the titanium substrate, drying at the temperature of 70-90 DEG C for 5 minutes, sintering at the temperature of 500-550 DEG C for 5 minutes, repeating the process till an oxide coating is up to 1.5-2.0 mg/cm<2>, and sintering at the temperature of 500-550 DEG C for one hour. The anode provided by the invention can be widely applied in the fields of seawater electrolysis chlorine preparation, electroflotation, electroosmosis, electrodeionization and the like. The anode has stable performance and high current efficiency, the precious metal molar ratio is lowered to 2.5-30 percent, and the cost can be lowered remarkably.

The invention discloses a hydrotalcite-like thin membrane which is grown on an aluminum substrate with surface anode oxidation and used as a structuring catalyst in the field of membrane catalysis, so as to catalyze the optimal feed ratio of citral to acetone during the aldol condensation reaction of the citral and the acetone. The in-situ synthesis technology is adopted for preparing the hydrotalcite-like thin membrane on an aluminum sheet after the surface anode oxidation, the high-temperature calcination and the re-hydration are further carried out, and the hydrotalcite-like structuring catalyst which takes aluminum as the substrate is finally obtained. The prepared structuring catalyst can be effectively used for the aldol condensation reaction of the citral and the acetone, solve a series of problems caused by a liquid base catalyst and a solid base catalyst and lead the process to meet the requirements on environmental protection and sustainable development; more importantly, the use of the structuring catalyst can effectively reduce the molar ratio of acetone/citral to 1, thereby obtaining great catalytic effect.

The invention relates to a plate, in particular to an impregnated paper finished OSB composite floor and a preparation method. The impregnated paper finished OSB composite floor sequentially comprises an OSB base material layer, a veneer layer, a buffer paper layer, a balance paper layer and a sprayed decorative paper layer from bottom to top. The longitudinal static bending intensity of the OSB base material layer is larger than or equal to 50 MPa, and the water absorption thickness swelling rate of the OSB base material layer is smaller than or equal to 12%. The veneer layer is a poplar bleached veneer, and the thickness ranges from 0.6 mm to 1.2 mm. The buffer paper layer is impregnated kraft paper with the thickness of 0.4 mm to 0.6 mm, and the glue quantity is 80% or above. The weight of the balance paper layer ranges from 70 g to 80 g, and the glue quantity ranges from 100% to 120%. The weight of the sprayed decorative paper ranges from 70 g to 80 g, and the glue quantity ranges from 100% to 120%. The impregnated paper finished OSB composite floor has high environment friendliness, stability and water resistance.

The invention discloses a low formaldehyde resin adhesive for decorative impregnating paper and a preparation method thereof, wherein the resin adhesive contains: 60% by weight of 37% formaldehyde, 40% by weight of 98% urea, and 1.0-1.5% by weight of composite auxiliary agents which contains 0.2-0.3% by weight of curing agent, 0.5-0.8% by weight of cross-linking agent, and 0.3-0.4% by weight of reinforcing agent. The resin adhesive has the characteristics of low free formaldehyde content and high water resistance, and enhances the internal bonding force of the resin adhesive while reduces the mol ratio, which reduces the free formaldehyde releasing amount of the impregnating paper in the impregnating paper production process, and makes sure the each physical index demand of the decorative plate in the secondary hot pressing process.

The present invention prepares high-regularity, high-specific surface area and high-quality silicon-base MCM-48 molecular sieve with ternary mixed water solution of CTAB as cationic surfactant, OP-10 as non-ionic surfactant and SL as anionic surfactant as templating agent, TEOS as silicon source and under very low CTAB/SiO2 molar ratio and very low total surfactant concentration. Into the ternary mixture, alkali source and silicon source are added, and through crystallization, stoving and roasting, the preparation process is completed. The said preparation process has low cost and simple operation, and is environment friendly and suitable for large-scale production.

A method for selectively removing arsenic from a sulphide material containing arsenic by conducting a leaching step that includes contacting the material with a leaching solution that leaches arsenic from the material to form a pregnant liquor containing dissolved arsenic and a solid of a sulphide material of reduced arsenic content, and subsequently separating the solid from the pregnant liquor. The fresh leaching solution that is provided to the leaching step is an alkaline solution having a sulphide-containing compound present in an amount of from 0 to 1.0 times the amount of sulphur containing compound required to react with the arsenic present in the material.

The invention discloses a supported rare earth-modified metal catalyst which comprises a rare earth element-modified alumina carrier and active components supported on the rare earth element-modifiedalumina carrier, and the active components comprise an alkali metal element and a tungsten element; in the supported rare earth-modified metal catalyst, the mass percentage content of rare earth elements is 0.4-5% based on oxide. After the rare earth elements are added into the supported rare earth-modified metal catalyst for modification, the supported rare earth-modified metal catalyst has better catalytic performance when applied to preparation of methyl mercaptan through a reaction of methanol and hydrogen sulfide, the selectivity and yield of methyl mercaptan are improved, and the reaction temperature and the circulation amount of hydrogen sulfide are reduced.

The invention relates to the preparation field of chemical industrial materials, and particularly relates to a preparation method of a fibrous alkali magnesium sulfate whisker. The preparation method of the fibrous alkali magnesium sulfate whisker comprises the following steps: (1) preparing a magnesium sulfate solution by using MgSO4.7H2O, stirring and adding NaOH granular caustic soda, aging for 2-24 hours at the temperature of 25 to 100 DEG C to obtain a slurry; (2) transferring the slurry obtained in the step (1) into a hydrothermal reactor, wherein the filling degree is 50-80 percent, adding 0.5-5 percent of seed crystal according to the mass of the NaOH granular caustic soda, uniformly stirring, and reacting the slurry for 2-12 hours at the temperature of 130-180 DEG C; (3) cooling after finishing the reaction of the step (2), filtering, washing and drying a obtained white turbid liquid to obtain the fibrous alkali magnesium sulfate whisker. According to the preparation method, the seed crystal is added into the reaction slurry, alkali magnesium sulfate is easily subjected to nucleus formation growth, and the preparation concentration of the reaction slurry can be relatively high; the whisker nucleation time is reduced, and the whisker growth time also can be shortened.

The present invention provides a step-wise process for preparation of a bisphosphite. In step (a) the process prepares a phosphoromonochloridite in high yield, by contacting phosphorus trichloride with an aromatic diol in a slurry under reaction conditions and in the presence of a second aromatic diol to produce a mixture comprising the phosphoromonochloridite, the second aromatic diol, and excess PCl3. The slurry comprises less than 5 mole percent of a nitrogen base, and the organic solvent is selected for its low hydrogen chloride solubility. After removing the excess PCl3, a nitrogen base is added to effect condensation of the phosphoromonochloridite with the second aromatic diol to yield the bisphosphite. The invention particularly provides a process for preparing 6,6′-(3,3′,5,5′-tetra-tert-butylbiphenyl-2,2′-diyl)bis(oxy)didibenzo[d,f][1,3,2]dioxaphosphepine by the above route.