31results about How to "Avoid disproportionation reactions" patented technology

The invention provides a novel process for reducing the consumption of formaldehyde in the production of neopentyl glycol, comprising the following steps of: adding recycled diluted formaldehyde into a condensation kettle; starting agitating, and adding formaldehyde with the concentration of 37% to enable formaldehyde total amount in the condensation kettle to be 24 Kmol; adding 8 Kmol of isobutyraldehyde with the concentration of 97-98% and adding 4.12 Kmol of an NaOH solution with the concentration of 30%, which is one half of the total amount, at a room temperature; controlling the temperature in the kettle to 30-35 DEG C, the pH to 9-11 and the time to 2 hours in a process of adding alkali; then, improving the pH to 12-13 and adding the residual half of 4.12 Kmol of the NaOH solution with the concentration of 30% at a constant speed; controlling the temperature of the system to 40-45 DEG C and controlling time to 2 hours; raising the temperature to 45-50 DEG C and keeping for 3-4 hours; adding formic acid to neutralize a condensed solution until the pH is 7-8; recycling superfluous formaldehyde in a condensation reaction by pressurized distilling; and dehydrating an aldehyde removing solution from an aldehyde removing tower and carrying out pre-fractionation, rectification and flaking to obtain a neopentyl glycol finished product. According to the novel process provided by the invention, the utilization rate of formaldehyde in a production process of neopentyl glycol is improved, the quality of neopentyl glycol is improved and the consumption of sodium hydroxide is reduced.

The invention discloses a method for preparing a spherical stannous oxide nanomaterial. According to the method, stannic oxide, silicon dioxide and sodium humate are ground, mixed, put in a CO / (CO+CO2) atmosphere and calcined at a high temperature, smoke produced during calcination is introduced to water at the temperature under 10 DEG C, and the spherical stannous oxide nanomaterial is obtained through separation in water. The prepared stannous oxide nanomaterial has a regular spherical shape in appearance, uniform particle sizes and high purity, the method is simple and convenient to operate and environment-friendly and facilitates industrial production, and the production cost is low.

The invention discloses a ZrCo-based hydrogen isotope storage alloy with high circulation capacity, its preparation and application in storage, supply and recovery of hydrogen isotope. The general chemical formula of the high cycle capacity ZrCo-based hydrogen isotope storage alloy is Zr 1‑x Nb x co 1‑y Ni y , where 0

The invention provides a process for electrolysis of high nickel copper anode by periodic reverse current. Among them, the periodic reverse current can ensure the maximum use efficiency of electrolytic copper. By modifying the cathode copper sheet, the impurities and oxide film on the surface of the copper sheet are reduced. The treatment agent contains oxalic acid, which can be complexed by nickel ions. , reduce the concentration of nickel ions in the solution, improve the purity of the cathode copper after electrolysis, and purify the circulating electrolyte to reduce the waste of resources. The leveling agent can control the growth of grains, refine the grains, and make the surface of the cathode copper produced more flat. At the same time, it can effectively promote the reduction of copper ions and speed up the progress of electrolysis. The brightener can improve the brightness of the cathode copper electrode plate and effectively promote the shedding of anode slime, avoid the occurrence of anode polarization, speed up electrolysis, and improve production efficiency.

The invention relates to a preparation method of rhenium hexafluoride, which belongs to the technical field of fluorine chemical industry. In this method, the rhenium powder and nitrogen trifluoride mainly generate a mixture of rhenium hexafluoride and rhenium heptafluoride by adjusting the fluorination reaction conditions, and the disproportionation reaction of other valence rhenium fluorides can be basically avoided; The reaction conditions are such that rhenium heptafluoride reacts with rhenium powder to form rhenium hexafluoride, preventing rhenium heptafluoride and rhenium hexafluoride from being reduced to rhenium fluoride in a lower valence state. The method of the invention has the advantages of simple operation, safety and economy, high synthesis conversion rate, and the prepared rhenium hexafluoride has a purity higher than 90 wt%.

The invention provides a cobalt-free and nickel-free positive electrode material, a preparation method thereof and a battery. The preparation method comprises: preparing a cobalt-free nickel-free base material, mixing the cobalt-free nickel-free base material, a lithium source and a divalent manganese compound After the reaction, the cobalt-free and nickel-free cathode material is prepared. The present invention effectively inhibits layered LiMnO by adding a divalent manganese compound in the preparation process 2 Generation and spinel LiMn 2 o 4 Generates, promotes layered Li 2 MnO 3 In the process of circulation, the cycle performance is improved, and the invention has the characteristics of simple preparation process, low cost, little pollution and high cycle performance.

The invention discloses a battery cathode material of which the chemical formula is LiLa0.1 Co0.1 Mn1.8 O4. The spinel structure of the battery cathode material LiLa0.1 Co0.1 Mn1.8 O4 provided by the invention has low probability of being damaged after the mixing of Co ions, the electrical conductivity of a synthetic material is enhanced, a diffusion coefficient is increased to 2.4*10<-12> - 1.4*10<-11> m<2> / s from 9.2*10<-14> - 2.6*10<-12> m<2> / s, so as to be convenient for lithium-ion taking off and embedding, after the addition of LA ions, part of Mn ions can be replaced, in a later period of slight discharging, the concentration of Mn<+3> ions is lower, disproportionation reaction is prevented, dendritic crystal forming on the surface of a positive pole is avoided, a diaphragm is pierced, and the safety performance is improved. The synthetic material adopts a spinel structure. The synthetic material is more superior in cycle performance.

The invention discloses a method for preparing monofluoromethane with a Pd-M alloy supported catalyst. The preparation method of the catalyst of the present invention is as follows: first load the metal M nanoparticles on the carrier, then mix and stir the Pd precursor aqueous solution, prepare monodispersed Pd atoms on the M metal through a displacement reaction, and combine the Pd atoms with the M metal by roasting. The metals are combined to form a Pd-M alloy to obtain the monodisperse Pd-M alloy supported catalyst, wherein the metal M can be Cu, Zn, Ni, Ru, Sn or Fe. Compared with single, double and multi-component non-alloy catalysts, when the Pd-M alloy supported catalyst of the present invention is used to catalyze hydrodechlorination of chlorofluoromethane to prepare monofluoromethane, it is more effective for monofluoromethane (HFC-41 ) has a higher selectivity, which can reach about 95%, and the catalyst is not easy to deposit carbon, and has a longer life (within 1000h, the activity decreases within 10%, and the selectivity decreases within 5%). The process route of fluoromethane is simple, environmentally friendly and safe.

The invention provides a novel process for reducing the consumption of formaldehyde in the production of neopentyl glycol, comprising the following steps of: adding recycled diluted formaldehyde into a condensation kettle; starting agitating, and adding formaldehyde with the concentration of 37% to enable formaldehyde total amount in the condensation kettle to be 24 Kmol; adding 8 Kmol of isobutyraldehyde with the concentration of 97-98% and adding 4.12 Kmol of an NaOH solution with the concentration of 30%, which is one half of the total amount, at a room temperature; controlling the temperature in the kettle to 30-35 DEG C, the pH to 9-11 and the time to 2 hours in a process of adding alkali; then, improving the pH to 12-13 and adding the residual half of 4.12 Kmol of the NaOH solution with the concentration of 30% at a constant speed; controlling the temperature of the system to 40-45 DEG C and controlling time to 2 hours; raising the temperature to 45-50 DEG C and keeping for 3-4 hours; adding formic acid to neutralize a condensed solution until the pH is 7-8; recycling superfluous formaldehyde in a condensation reaction by pressurized distilling; and dehydrating an aldehyde removing solution from an aldehyde removing tower and carrying out pre-fractionation, rectification and flaking to obtain a neopentyl glycol finished product. According to the novel process provided by the invention, the utilization rate of formaldehyde in a production process of neopentyl glycol is improved, the quality of neopentyl glycol is improved and the consumption of sodium hydroxide is reduced.

The invention discloses a layered SiOx material, which is an accordion-shaped layered micron-scale particle. The particle size of the SiOx material is 0.5-20 μm, and there are slits and gaps with a nanometer-scale width between any adjacent layers. The width of the slit gap is 1-50nm, and the thickness of a single sheet is 30-40nm; the preparation method is: dissolving CaSi 2 The Ca in the layered siloxene material is obtained; the hydrogen bond and hydroxyl group on the surface of the siloxene are removed by high-temperature calcination to obtain a SiOx material. The preparation process of the present invention is simple, the process is less, the requirements for equipment are not high, and it is easy to industrialize mass production, and the obtained 2D layered SiOx material can be directly used as the negative electrode material of lithium ion battery without coating, showing excellent electrochemical performance .

The present invention discloses a stable ZRCO base high -entropy metal intervertebral compound with stable -type crystalline -type suction / hydrogen reactions and its preparation methods and applications in hydrogen isotope storage, supply, and recycling.The chemical general formula of the ZRCO base high entropy metal compound is ZR 1‑ x NB x CO 1‑2x CU x NI x Among them, 0 <x ≤0.3; the intervertebral metal compound of the ZRCO high entropy metal has a structural orthogonal crystal B33 phase and a cubic crystal type B2;Orthogonal crystal B33 phase and orthopedic crystal ZRCOH 3 The phase and cubic crystal type B2 phase is related to the cubic crystal ZRCO (H) phase.The method of preparation includes: prepare zr 1‑x NB x CO 1‑ 2x CU x NI x The alloy ingot, the room temperature is damaged by the hydrogen absorption, and the hydrogen absorption powder is obtained, and then the air is dehydrated at 500 ° C. The ZRCO base high entropy metal intervertebral compound with an orthogonal crystal B33 is obtained at 500 ° C.

The invention relates to a method for preparing stiripentol disclosed as a chemical structural formula II from 4-(2-methylallyl)-1,2-phenyldiphenol disclosed as a chemical structural formula I, which comprises the following steps: etherifying 4-(2-methylallyl)-1,2-phenyldiphenol, isomerizing, and carrying out oxidation reaction, condensation reaction and reduction reaction to obtain the stiripentol. The stiripentol is a new drug for treating epilepsy.

A method for preparing 3-methoxy-4-hydroxy mandelic acid adopts guaiacol and glyoxylic acid as raw materials, and comprises the following steps: slowly adding a 30 wt% sodium hydroxide solution into the glyoxylic acid solution with stirring, allowing the mixed solution to react at a reaction temperature of 0-50 DEG C and a pH value of 1-7 to obtain a sodium glyoxylate solution; adding the guaiacol into water with stirring and under the protection of nitrogen gas, slowly adding the 30 wt% sodium hydroxide solution, allowing the mixed solution to react at a reaction temperature of 0-50 DEG C and a pH value of 11-12 to obtain guaiacol sodium; slowly and dropwisely adding the sodium glyoxylate solution into the guaiacol sodium solution with stirring and under the protection of nitrogen gas, with the mole ratio of the sodium glyoxylate and the guaiacol sodium being 1:1.2-2, allowing the mixed solution to react at a reaction temperature of 0-20 DEG C and a pH value of 11-12, 30-90 min after the dropwise addition, stirring the mixed solution for 1-3 hours, stopping the reaction at the reaction temperature for 24-36 hours, then acidifying the reaction solution by a 50 wt% sulfuric acid solution to control the pH value to be 4-5. The yield of the reaction is above 95 wt%.

The invention relates to a bimetallic catalyst supported by carbon nanotubes and its preparation method and application, comprising a first metal, a second metal and a carrier component, wherein the first metal is a Group VIII element, and the second metal is IV, V or IIB The main group metal, the amount of the first metal in the carrier is 1-5wt%, the atomic ratio of the second metal to the first metal is 0.01-0.5, and the carrier is a vulcanized multi-walled carbon nanotube . The invention has the following advantages: 1) The raw materials are cheap and easy to obtain, and the economic cost is low. 2) The reaction condition is mild, the energy consumption is low, the process is simple and easy to operate. 3) The reaction is environmentally friendly, green and pollution-free. 4) The reaction conversion rate is high, the selectivity is good, and the product purity is high.

The present invention disclosed a ZRCO -based hydrogen -based alloy storage alloy with a high -cycle stable performance with orthogonal crystal structure. The chemical general is ZR 1‑x NB x CO 1‑y CU y H z Among them, 0 <x ≤ 0.5, 0 <y ≤ 0.5, 0.2 ≤Z ≤3; the orthogonal crystal structure is B33 phase.This alloy preparation method includes: preparation of ZR 1‑x NB x CO 1‑y CU y Alloy cast ingot, hydrogen absorption activation and crushing obtained hydrogen isotope storage alloy hydrogen powder powder, then put in a seal reactor, warmed up to 380 ° C, and have a B33 phase of hydrogen to the alloy to cool to room temperaturehave to.You can use this alloy orthogonal crystal B33 phase and orthogonal crystal saturated hydrogen -absorbing phase ZRCOH 3 The transformation of the same crystal transformation between the hydrogen is the storage, supply, and recycling of hydrogen isotope.

A method provide high-purity nitric oxide by preserving quality of the nitric oxide by suitably inhibiting the disproportionation reaction of the nitric oxide that is transported in a state of being stored in a high-pressure gas cylinder, and decreasing the amount of nitrous oxide and nitrogen dioxide that are produced during the transportation. When the nitric oxide is transported in a state of being stored in the high-pressure gas cylinder, the nitric oxide is filled into the high-pressure gas cylinder at a gauge pressure between 1.96 MPa to 3.5 MPa to be stored, and is transported in a state in which the exterior surface temperature of the high-pressure gas cylinder is held in a range from −15° C. to 5° C.