35results about How to "Maintain active stability" patented technology

The present invention provides an agarose gel separation medium which is uniform in size, controllable and has high hydrophility and high porousness, and can be used for making separation and purification of biological active material. Its preparation method is characterized by that it adopts the following steps: (1) dissolving a certain quantity of agarose in a certain quantity of water under the heating condition to obtain agarose aqueous solution with a certain concentration, using pressure to make said aqueous phase by passed through microporous membrane and make it feed into oil phase to obtain emulsion drop with uniform size; and (2). transferringsaid emulsion into cooling device, under the condition of adopting programmed temperature-falling and slow-mechanically stirring process cooling to below 15 deg.C and making gel be solidified so as to obtain the invented agarose gel microspheres with uniform size.

The invention relates to a catalyst for poor diesel hydrotreatment and a preparation method. In the catalyst, W-Mo-Ni-P is used as an active component; alkali metal, alkaline earth metal or rare-earth metal is used as an auxiliary; silicon-aluminum is used as a carrier; according to weight percentage, the alkali metal, alkaline earth metal or rare-earth metal accounts for 2 to 9 percent, WO3 accounts for 5 to 25 percent, MoO3 accounts for 8 to 20 percent, NiO accounts for 2 to 9 percent, P accounts for 1.0 to 5 percent, and the balance is the silicon-aluminum oxide carrier. The catalyst is used for evaluating mixed oil with raw material oils of catalytic cracking diesel and coked diesel, performs excellent reaction activity and stability in condition and stability tests, and can remove more than 90 percent of sulfur and nitrogen in the poor mixed diesel.

The invention relates to uniform-sized konjak gulcomannan microspheres. The average particle size of the microspheres is less than 10 mu m; the content of the konjak gulcomannan in the microspheres is greater than 20% (w / w); the particle size is uniform; and the particle size distribution coefficient Span value is less than 0.9. The invention further provides a preparation method of the microspheres. According to the invention, the problems that the konjak gulcomannan microspheres of which the particle size is less than 10 mu m are hard to prepare by using the conventional method and the prepared microspheres are not uniform in particle size are solved.

The invention relates to a hydrocracking method for increasing production of high-quality middle distillates. The method comprises the following steps that: fresh feedstock oils are simultaneously introduced into a hydrofining reactor and a hydrocracking reactor in a co-current flow way; the hydrofining reactor is sequentially filled with a hydrofining catalyst and an amorphous hydrocracking catalyst; the hydrocracking reactor is sequentially filled with a hydrofining catalyst and a zeolite hydrocracking catalyst; a reaction effluent from the hydrofining reactor is separated to obtain light naphtha fractions and tail oil fractions; and all or part of the tail oil fractions are introduced into the hydrocracking reactor, and a reaction effluent from the hydrocracking reactor and part of the feedstock oils are introduced into the hydrofining reactor together. According to the method provided by the invention, the heavy distillates can be treated, and the maximum production of the middle distillates can be realized.

A Bi / Bi 2 SiO 5 The preparation method and application of a photocatalyst belong to the controllable preparation of Bi / Bi-based photocatalytic material composite system, CO 2 Reduction of resources conversion and utilization, artificial photosynthesis field, can solve Bi 2 SiO 5 Due to the narrow photoresponse range and high photogenerated electron-hole recombination rate, Bi(NO 3 ) 3 ·5H 2 O and Na 2 SiO 3 ·9H 2 O is a bismuth source and a silicon source, ethylene glycol and deionized water are the solvents, and the NaOH solution is the pH value adjuster. Using a one-step hydrothermal method, the pH value of the reaction solution is adjusted between 9 and 14 by adjusting the concentration of the NaOH solution. High purity Bi / Bi 2 SiO 5 Photocatalysts that ultimately increase Bi 2 SiO 5 Photocatalytic reduction of CO 2 The activity, selectivity and stability provide new methods and new applications for the preparation of high-efficiency novel elemental Bi / Bi-based photocatalytic material composite systems.

The invention provides a method for producing naphtha and clean gasoline by catalytic cracking diesel oil. The method comprises the following steps of mixing the catalytic cracking diesel oil and hydrogen gas; enabling the mixture to enter the middle part of a reverse sequence filling hydrocracking reactor-hydrofining reactor to be mixed with cracking products from the hydrocracking reactor; enabling the mixture to enter the hydrofining reactor to perform a hydrofining reaction so as to remove impurities such as sulfur and nitrogen; performing an olefin saturated reaction and arene hydrogenation saturation; performing cutting processing on products after the hydrofining; using distillate oil below 165 DEG C as a naphtha product to be used as a raw material for a catalytic reforming unit; using distillate oil being 165 to 205 DEG C as a clean gasoline conditioning ingredient; returning distillate oil being 205 to 320 DEG C into the top of the reverse sequence filling hydrocracking reactor-hydrofining reactor; performing hydrocracking and hydrofining reactions; returning distillate oil being higher than 320 DEG C into a catalytic cracking device for further cracking, or enabling the distillate oil being higher than 320 DEG C to enter other hydrogenation devices for processing treatment. The method has the advantages that high yield of naphtha products is taken as the goal; the clean gasoline can be produced at the same time.

The invention discloses a deoxygenating and desulfurization double-function fine desulfurization agent and a preparation method thereof. The structure of the fine desulfurization agent is aAxOy.bGO.mDxOy.nMO3, wherein A is iron or manganese; G is calcium or magnesium; D is one of copper, zinc, antimony, lead and silver; and M is molybdenum or tungsten. The deoxygenating and desulfurization double-function fine desulfurization agent comprises the following components according to the total mass of the catalyst: 40%-65% of AxOy, 25%-40% of GO, 5%-10% of DxOy and 5%-10% of MO3. The catalyst can be used for purifying coke oven gas and raw gas for producing methanol by converter gas, and has the advantages of good deoxygenating and desulfurization activity, no byproducts including mercaptan and the like, stable activity and the like.

An alkaline solid adsorbent for deacidifying and refining the liquid esters of organic acid is prepared from the oxide and hydroxide of alkali-earth in IIA family and alumina through wetting, mixing,kneading, extruding to become strips, drying and high-temp calcining. It has high specific surface area, adsorptive volume and mechanical strength.

The invention provides a hydrogel and a protein drugs. The hydrogel comprises the following raw materials in parts by weight: 1 to 50 parts of chitosan, 0.1 to 20 parts of a crosslinking agent and 10to 100 parts of water; the crosslinking agent is prepared by combining a non-degradable raw material A and a degradable raw material B to form a block copolymer, and connecting a raw material C at thetail end of the block copolymer. The hydrogel is injectable, coatable and degradable in vivo, can well maintain the biological activity of the drug protein, and has no toxic or side effect on the hydrogel and degradation products thereof. The protein drug adopts the hydrogel to carry and disperse the drug protein, so that the biological activity and the functional stability of the drug protein can be well maintained.

The invention relates to a method for producing propylene from methanol or dimethyl ether, and mainly solves the problems that a catalyst is easily inactivated due to short reaction residence time and the reaction conditions are frequently fluctuated and the operation is unstable caused by frequent switch and reproduction in the prior art. The method for producing the propylene from the methanol or the dimethyl ether comprises the following steps of: a) making oxygen-containing compounds and a diluent enter a fluid bed reactor from the bottom; b) performing contact reaction on the raw materials and a ZSM-5 molecular sieve catalyst at the temperature of between 400 and 550 DEG C under the pressure of between 0.02 and 0.5 MPa; c) separating gas-phase material flow out of the top of the fluid bed reactor to obtain the propylene; d) extracting the reaction heat by using a heat exchanger; e) controlling the inactivated catalyst with a sliding valve and feeding the catalyst into a regenerator through a catalyst spending inclined tube, reacting the inactivated catalyst with air at the temperature of between 480 and 700 DEG C to burn off carbon deposit, and exhausting waste gas; and f) controlling the regenerated catalyst by using the sliding valve and feeding the regenerated catalyst to the upper part of the fluid bed reactor for circulation through a catalyst regenerating inclined tube. The technical scheme of the invention better solves the problems, and can be applied to the industrial production of the propylene.

The invention relates to an inferior gasoline hydrotreating catalyst and a preparation method and application thereof. The catalyst comprises the following active components in percentage by mass: 19 to 22 percent of WO3, 4 to 5 percent of NiO, 2 to 3 percent of P (on the basis of the mass of P2O5), 10 to 13 percent of MoO3, 1 to 2 percent of lithium or lanthanum (on the basis of oxides) and the balance of silicon-aluminum carrier. According to the preparation method, catalytic gasoline of which the mixed volume ratio is 3:1 and coker gasoline are hydrotreated under the action of the catalyst to remove sulfur and nitrogen, wherein the sulfur content of the mixed gasoline is 2,854 ug.g<-1>, the nitrogen content is 760 ug.g<-1>, the removal rate of the sulfur and the nitrogen is over 95 mass percent, and the content of the sulfur and the nitrogen in treated products is less than 50 ug.g<-1>.