822 results about "Iodide" patented technology

The invention discloses a zinc-iodine battery positive electrode material based on corn straw shell derived porous carbon and a preparation method of the zinc-iodine battery positive electrode material. According to the material, corn straw shells serve as the sole carbon source, an indigenous nitrogen-doped biomass charcoal carrier with a hierarchical pore structure is prepared through pre-carbonization and KOH activation processes, and the material is characterized in that the specific surface area is larger than or equal to 1500 m < 2 > / g, and the micropore proportion is larger than 90%. The iodine is loaded on the carrier (the iodine content is greater than or equal to 45wt%) through a vacuum sublimation method to form the indigenous nitrogen-doped biomass charcoal / iodine composite material. According to the positive electrode material, through the synergistic effect of physical confinement and pyridine nitrogen chemical adsorption, the multi-iodide shuttle effect is effectively inhibited, so that the capacity retention rate of the zinc-iodine battery is greater than or equal to 93% after 40000 cycles under the current density of 2A g <-1 >, and the capacity retention rate is greater than 45% under the rate of 10A / g. The method has double benefits of agricultural waste resource utilization and high-performance energy storage device development.

The invention discloses a pyridyl anti-aging agent as well as a synthesis method and application thereof, the anti-aging agent is obtained by taking 5-nitro-N-phenylpyridine-2-amine synthesized by 2-chloro-5-nitropyridine and aniline and iodide synthesized by alcohol and iodine as raw materials, and reacting in the presence of a hydrogen source and a catalyst. The anti-aging agent provided by the invention can effectively slow down the emigration speed of the anti-aging agent in rubber and greatly improve the phenomenon that the appearance of a tire becomes red, has one more N heteroatom than other anti-aging agents in the structure, has good oxidation resistance and flex cracking resistance, and is high in anti-ozone activity, environment-friendly and small in pollution.

The invention relates to an aqueous alkaline zinc-iodine battery and a preparation method thereof, and belongs to the technical field of aqueous zinc-iodine batteries. The battery includes: a positive electrode; a negative electrode; and an aqueous alkaline electrolyte; wherein the positive electrode comprises a current collector, a positive electrode active material, a conductive agent and an adhesive, and the positive electrode active material is iodide; the aqueous alkaline electrolyte comprises a chlorine-containing additive, a zinc salt electrolyte, an alkaline inorganic salt and water. The aqueous alkaline zinc-iodine battery provided by the invention is low in cost and simple to manufacture. According to the aqueous alkaline zinc-iodine battery provided by the invention, the iodide is adopted as the positive electrode active material, so that instability and potential safety hazards caused by taking an iodine elementary substance as the positive electrode at present are avoided. The battery disclosed by the invention releases a high-potential discharge platform at 1.65-1.68 V, the discharge capacity reaches 372-385 mAh.g <-1 >, and the battery shows rapid oxidation-reduction kinetics and excellent long-acting cycle stability.

The invention relates to a method for synthesizing tetrasubstituted-1, 3-allene dicarboxylic acid, and discloses a method for synthesizing tetrasubstituted-1, 3-allene dicarboxylic acid by taking 1, 3-enyne and iodide as raw materials, potassium formate as a formate source, DABCO as a hydrogen transfer catalyst, Ir (bpy) 2 (dtbpy) PF6 as a photocatalyst and cesium carbonate as alkali through the following steps: introducing CO2 at normal pressure; the allene dicarboxylic acid compound can be obtained at excellent to good yield under the irradiation of visible light at room temperature for 24 hours, the reaction condition is mild, the regioselectivity is good, the functional group tolerance is good, and many defects in the prior art are overcome.

The invention provides a stable perovskite precursor solution and a preparation method and application thereof. The perovskite precursor solution comprises a solute, a solvent and a stabilizer; the stabilizer comprises a compound containing a reducing group and a hydrogen ion group capable of being ionized; the solute comprises bromomethylamine, formamidine iodide, chloromethylamine, cesium iodide, lead iodide and lead bromide. The preparation method comprises the following steps: mixing a solute and a solvent, adding a stabilizer into the mixture, and mixing to obtain the perovskite precursor solution. According to the invention, the specific composition of the perovskite precursor solution is designed, and a specific stabilizer is further used, so that the perovskite precursor solution with relatively high stability and a relatively good storage effect is prepared.

The invention relates to an aqueous zinc-iodine battery electrolyte containing a phenolic additive, and a preparation method and application thereof, and belongs to the technical field of aqueous zinc-iodine batteries. The invention aims to solve the technical problems of serious multi-iodide shuttling and negative electrode by-products of the existing aqueous zinc-iodine battery. The preparation method of the aqueous zinc-iodine battery electrolyte containing the phenolic additive comprises the following steps: dissolving zinc salt and the phenolic additive in deionized water, and fully stirring and mixing to obtain the aqueous zinc-iodine battery electrolyte containing the phenolic additive. The phenolic additive used in the application can accelerate conversion from I3-to I-, accelerate iodine conversion reaction kinetics and reduce generation of polyiodide, so that shuttling of the polyiodide is effectively inhibited, a phenolic additive monomer is adsorbed on the surface of a zinc negative electrode, contact between Zn < 2 + > and water molecules is reduced, and generation of zinc negative electrode by-products is inhibited; the zinc-iodine battery also has the advantages of being easy to manufacture and low in cost.

The present application discloses a use of an additive, formamidinium iodide and a preparation method therefor, a perovskite solar cell, a solar power generation device, and an electric device. The additive comprises a reducing agent. By incorporating the reducing agent in the additive and using the additive to prepare formamidinium iodide, generation of elemental iodine in the preparation process of formamidinium iodide can be reduced; in addition, iodine which has been oxidized to elemental iodine can be reduced to iodine anions so as to generate formamidinium iodide. The stability of formamidinium iodide is improved, and thus the stability and efficiency of perovskite cells are improved.

The present disclosure provides an integrated process for producing trifluoroiodomethane (CF3I), in three steps: a) reacting a first reactant stream comprising hydrogen (H2) and iodine (I2) in the presence of a first catalyst to produce a first product stream comprising hydrogen iodide (HI); (b) reacting the first product stream with a second reactant stream comprising trifluoroacetyl chloride (TFAC) in the presence of a second catalyst to produce an intermediate product stream comprising trifluoroacetyl iodide (TFAI); and (c) reacting the intermediate product stream to produce a final product stream comprising trifluoroiodomethane. (CF3I).

The invention discloses an ammonia nitrogen detection system and an application method thereof, and ammonia nitrogen detection test paper, the ammonia nitrogen detection system is prepared by the following steps: step SA1) preparing a dipping mixed solution, the dipping mixed solution comprises: a potassium sodium tartrate solution with a concentration of 3-60 g / L; a sodium salicylate solution with a concentration of 20-320 g / L; the concentration of the sodium nitroprusside solution is 0.1 to 0.8 g / L; and deionized water. On the basis of the principle of salicylic acid-pypocholoride spectrophotometry, the impregnated test paper, the reagent tube and the standard colorimetric card are combined, and the rapid ammonia nitrogen detection system special for medium-concentration sewage detection is successfully developed. The toxicity problem of mercury iodide in a Nessler reagent method and the toxicity problem of phenol in a phenol-pypocholoride spectrophotometric method are avoided, main reagents are non-toxic and harmless to a human body, interference of metal ions in a water sample can be effectively eliminated by adopting sodium potassium tartrate tetrahydrate as a chelating agent, and the detection stability and accuracy are improved.

The invention discloses a polymer sealing ring and a preparation method thereof, and relates to the technical field of polymer materials. The high-temperature-resistant fluororubber sealing gasket is prepared from the following raw materials in percentage by mass: 30 to 50 percent of fluorinated modified silicone rubber, 15 to 25 percent of fluororubber, 7.2 to 16.4 percent of hybrid white carbon black, 2.5 to 6 percent of hydroxyl silicone oil, 8 to 11 percent of plasma fluorinated modified aluminum oxide, 4 to 8 percent of carbon black, 0.8 to 1.4 percent of palm wax, 0.8 to 1.4 percent of internal release agent, 1 to 2 percent of vulcanizing agent, 3 to 5 percent of triallyl isocyanurate and 0.5 to 1 percent of anti-aging agent. The fluorinated modified silicone rubber is prepared by grafting C2-18-perfluoroalkyl iodoethane on a silicone rubber side chain, so that the low temperature resistance of the silicone rubber is effectively improved, and the phenomenon that methyl vinyl silicone rubber is easy to crystallize at low temperature is successfully inhibited; the sealing ring material has good performance at high and low temperatures, and the use temperature range of the sealing ring material is effectively improved.

The invention discloses an electrolyte of an aqueous zinc-iodine battery, and relates to the technical field of zinc-iodine batteries, the electrolyte is prepared from an I + stabilizer, a hydrogen bond ligand, a low-freezing-point hydrogen donor solvent and a zinc salt, and the molar ratio of the I + stabilizer to the hydrogen bond ligand to the low-freezing-point hydrogen donor solvent to the zinc salt is 1: 0.5: 5: 0.5-1.5. The invention also provides a preparation method of the electrolyte and a zinc-iodine battery prepared by using the electrolyte. The zinc-iodine battery constructed by the invention can realize highly reversible I- / I2 / I + conversion and rapid iodide conversion kinetics in a wide temperature range of-25 DEG C to 40 DEG C, and has high energy density and excellent long cycle stability. In addition, due to the unique solvation structure of the electrolyte, the activity of water molecules in the system is reduced, and then the hydrogen evolution reaction and other side reactions are inhibited. Therefore, the invention provides a feasible strategy for realizing wide temperature range, high capacity and high performance of the zinc-iodine battery.

The invention discloses a cellulose paper-based diaphragm for a zinc-iodine battery as well as a preparation method and application of the cellulose paper-based diaphragm. The diaphragm is of a three-layer composite structure and comprises a matrix layer formed by paper pulp fibers such as softwood pulp, hardwood pulp, bamboo pulp or straw pulp through a wet papermaking technology, and compact functional layers which cover the two sides of the matrix layer and are formed by oxidized nanocellulose (TOCN). The preparation method mainly comprises the following steps: preparing the paper-based diaphragm matrix through wet papermaking, coating the two sides of the paper-based diaphragm matrix with TOCN aqueous dispersion, and finally carrying out hot-pressing drying treatment to enable the three layers to be tightly combined. According to the invention, the nano aperture and the surface negative electricity functional group of the TOCN layer are utilized, so that physical blocking and electrostatic repulsion of polyiodide ions can be realized at the same time, and the shuttle effect is effectively inhibited; and the uniform pore channels can guide zinc ions to uniformly deposit and inhibit dendritic crystal growth. The diaphragm is green in raw material, simple in process and low in cost, and the cycle life and coulombic efficiency of the battery can be remarkably improved when the diaphragm is applied to the zinc-iodine battery.

The invention relates to the technical field of energy storage, in particular to an iron monatomic modified carbon nanotube array, a preparation method and application of the iron monatomic modified carbon nanotube array in an aqueous zinc-iodine battery, simple and convenient solid-phase reaction and high-temperature carbonization strategies are adopted, carbon cloth serves as a substrate, ferric acetylacetonate, boric acid, polyethylene glycol and urea serve as an iron source, a boron source, a carbon source and a nitrogen source respectively, and the iron monatomic modified carbon nanotube array is prepared. And after high-temperature calcination, growing an iron monatomic modified carbon nanotube array on the carbon cloth in situ. The iron single atom not only enhances the chemical capture capability of the carbon nanotube on the polyiodide, but also promotes the oxidation-reduction conversion of iodine; the carbon nanotube array provides a physical space for limited adsorption of iodine species and effectively promotes ion diffusion. Therefore, the obtained water-based zinc-iodine battery shows high specific capacity and good cycling stability. The whole technological process is simple and convenient to operate, has industrial application prospects, and provides a novel preparation method for the carbon-based iodine positive electrode host material of the aqueous zinc-iodine battery.

The invention discloses an additive and application thereof, formamidine iodide and a preparation method thereof, a perovskite solar cell, a solar power generation device and a power utilization device. The additive comprises a reducing agent. According to the present invention, the reducing agent is contained in the additive, and is used for preparing the formamidine iodide, such that the generation of the iodine simple substance during the formamidine iodide preparation process can be reduced, the iodine oxidized into the iodine simple substance can be reduced into the iodine negative ion so as to be used for generating the formamidine iodide, and the stability of the formamidine iodide can be improved so as to improve the stability and the efficiency of the perovskite cell.

The invention relates to the technical field of electrode materials, in particular to a wide-temperature-range high-iodine-loading positive electrode material, a preparation method thereof and a zinc-iodine battery. The method comprises the following steps: mixing activated carbon and iodine simple substance, and heating to sublimate and embed the iodine simple substance into the activated carbon to obtain iodine-loaded carbon black I2-coated CB; mixing gelatin and an acetic acid solution to obtain a gelatin binder solution; mixing the iodine-loaded carbon black I2-coated CB, a conductive agent and a gelatin binder solution to obtain iodine positive electrode slurry; and coating a stainless steel mesh with the iodine positive electrode slurry, and drying to obtain the wide-temperature-range high-iodine-loading positive electrode material. According to the wide-temperature-range high-iodine-load positive electrode material prepared by the method, active functional groups such as peptide bonds, carboxyl groups and amino groups of gelatin in the gelatin binder solution are utilized, the constraint capability on active iodine and the chemical adsorption effect on polyiodide are utilized, and therefore the problems of active iodine dissolution and polyiodide shuttling are effectively inhibited.

The invention discloses a catalyst system for methanol low-pressure carbonyl synthesis of acetic acid, and relates to the technical field of methanol low-pressure carbonyl synthesis of acetic acid, the catalyst system comprises a group VIII metal main catalyst, an iodomethane cocatalyst, an inorganic iodide, and an ionic liquid with [NR1R2R3R4] < + > [CH3COO] <-> as a catalyst stabilizer, r1, R2, R3 and R4 in the ionic liquid are alkyl, aryl and acyl containing 4-9 carbons or a combination thereof, and when the catalyst system is applied to a process for synthesizing acetic acid by methanol low-pressure carbonyl, a metal catalyst can be kept stable under the condition of low water content, so that the separation energy consumption of a subsequent rectification system is reduced.

The invention relates to a method for synthesizing tetrasubstituted ‑1,3‑enedicarboxylic acid, and discloses a method for synthesizing tetrasubstituted ‑1,3‑enedicarboxylic acid. The method comprises the following steps: using 1,3‑enyne and iodide as raw materials, potassium formate as a formate source, DABCO as a hydrogen transfer catalyst, Ir(bpy)2(dtbpy)PF6 as a photocatalyst, and cesium carbonate as a base, introducing CO2 under normal pressure, and obtaining an enedicarboxylic acid compound with an excellent to good yield under room temperature and visible light irradiation for 24 hours. The method has mild reaction conditions, good regioselectivity, and good functional group tolerance, and makes up for many deficiencies of the prior art.

The invention discloses a method with high catalyst stability for low-pressure carbonyl synthesis of acetic acid from methanol, and relates to the technical field of low-pressure carbonyl synthesis of acetic acid from methanol, and the method comprises the following steps: S1, reaction section: introducing methanol or a reactive derivative thereof and CO into a reactor, adding a group VIII metal catalyst, an iodomethane cocatalyst and inorganic iodide, and carrying out a reaction for 2-4 hours; the preparation method comprises the following steps: by taking a raw material as a raw material and an ionic liquid with a [NR1R2R3R4] < + > [CH3COO] <-> structure as a catalyst stabilizer, carrying out carbonyl synthesis reaction on the material in a reactor to obtain an acetic acid crude product, and in the formula, R1, R2, R3 and R4 are alkyl, aryl and acyl containing 4-9 carbons or a combination thereof; s2, carrying out gas-liquid separation; s3, evaporating and washing; s4, light component removal treatment; and S5, purification treatment, so that the VIII group metal catalyst can still keep stable when reactants are in a reaction system with low water content of 0.5-1.0%, the energy consumption of a rear-end dehydrating tower and a finished product tower is reduced, and the production cost is reduced.

The invention discloses a GO-TAPP microporous composite material as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The preparation method comprises the following steps: adding 5, 10, 15, 20-tetra (4-ethynylphenyl)-porphyrin, bis (triphenylphosphine) palladium chloride and cuprous iodide into tetrahydrofuran, uniformly mixing in a dark place, adding graphene oxide and triethylamine, mixing in a dark place, carrying out a reaction to obtain a black solid after the reaction is finished, and washing and drying the black solid to obtain the GO-TAPP microporous composite material. The GO-TAPP microporous composite material taking the graphene oxide and the porphyrin as structural units can resist bacteria synergistically through PTT and PDT, and is good in biocompatibility and free of toxic and side effects, and the hemolysis rate on cells is lower than 2%. The GO-TAPP is in a sheet shape and can be directly cut, pasted and directly used, post-processing is not needed, and the application prospect of the GO-TAPP is improved.

Methods, systems and devices for PFAS destruction including adding a sulfite salt to an aqueous solution containing PFAS and then irradiating the aqueous solution with light at 222 nm. The method may include adding a base to the aqueous solution in an amount sufficient to raise a pH of the aqueous solution including PFAS to about 10 or more. It may also include adding a halide salt such as a bromide salt or an iodine salt, and further adding a carbonate. Greater than 90%, or greater than 99%, of the PFAS in the solution may be destroyed by irradiating the aqueous solution in this way.

The invention relates to an iodine-loaded positive electrode for a zinc-iodine battery and a preparation method and application of the iodine-loaded positive electrode, and belongs to the technical field of positive electrode materials for zinc-iodine batteries. The preparation method of the iodine-loaded positive electrode for the zinc-iodine battery comprises the following steps: mixing an iodine-loaded carbon material, conductive carbon black, a polysaccharide binder and deionized water in proportion, grinding into slurry, uniformly coating a current collector with the slurry, and drying to obtain the iodine-loaded positive electrode for the zinc-iodine battery. As the polysaccharide binder is rich in a large number of active functional groups (hydroxyl, carboxyl and the like), dissolution of active iodine and a shuttle effect of polyiodide can be inhibited through a chemical adsorption effect, corrosion to a zinc negative electrode caused by attenuation of battery capacity and shuttle of the polyiodide is avoided, and the polysaccharide binder has a good application prospect in the zinc-iodine battery.

The invention discloses an electrolyte for improving the cycling stability of a zinc-sulfur battery and application of the electrolyte in a photoelectric storage integrated battery. The electrolyte comprises a solvent, an additive and zinc salt, the additive is iodide, and the iodide comprises iodine negative ions and positive ions or polar functional groups. The functional additive is added into the electrolyte, positive ions inhibit dendritic crystals and side reactions of zinc, and iodine negative ions accelerate reversible change between sulfur and zinc sulfide, so that the cycling stability of the zinc-sulfur battery is improved. A zinc-sulfur battery with high specific capacity and long cycle life is integrated with a solar battery, so that the photoelectric storage integrated battery with high overall conversion efficiency, high specific capacity and long cycle life is prepared.

The present invention belongs to the technical field of functional food application. Disclosed in the present invention are a plant extract modified molecular probe and a preparation method and an application thereof. The preparation method of the plant extract modified molecular probe comprises the following steps: dropping a 3-ethyl-2-methylbenzothiazole iodide solution into a saffron aldehyde solution to obtain a mixed solution; dropping an inorganic salt solution into the mixed solution, mixing and performing a condensation reaction to obtain a plant extract modified molecular probe. The obtained plant extract modified molecular probe has good chemical stability and can be stored for a long time. It has good biocompatibility, is non-toxic, and has good photostability, it is not prone to photobleaching during long-term irradiation.

An MXene or a derivative thereof, on which nitrous oxide reductase is immobilized, wherein the MXene has a formula of Mn+1XnTs, wherein M is a transition metal of Groups 3, 4, 5, 6, or a combination thereof, of the Periodic Table of the Elements, X is carbon, nitrogen, or a combination thereof, T is oxide, epoxide, hydroxide, C1-C5 alkoxide, fluoride, chloride, bromide, iodide, or a combination thereof, and n is 1, 2, or 3, and s is 0, 1, or 2.

The invention relates to the technical field of adsorbents, and discloses a photooxidation adsorbent for removing radioiodide and a preparation method thereof, the adsorbent comprises a zirconium-based metal organic framework, and bismuth trioxide is uniformly deposited on the surface of the zirconium-based metal organic framework. The obtained adsorbent can well adsorb iodine through the photooxidation capacity.

The invention relates to an electrolyte for synergistically stabilizing positive electrode iodine multi-electron reaction through four-combination zinc salt and a high-surface-capacity zinc-iodine soft package battery. The electrolyte comprises the four-combination zinc salt and water, in the electrolyte, the total concentration of zinc ions in the four combinations of zinc salts is 2 + / -0.2 mol / L; the four-combination zinc salt is a four-combination zinc salt; the SO4 < 2-> in the electrolyte buffers the pH value of a system, so that side reaction of a negative electrode is reduced; cH3COO <-> can be cross-linked with I3 <->, so that shuttling of polyiodide is inhibited, and reversibility of a two-electron reaction is enhanced; bromide ions Br <-> in the electrolyte are chemically combined with I < + > through isohalogen to excite four-electron reaction; the trifluoromethanesulfonate OTf <-> with strong electronegativity surrounds the positive electricity I < + > by virtue of an ion atmosphere effect, so that active water molecule attack hydrolysis failure is avoided, a synergistic stable positive electrode iodine multi-electron reaction is realized, and the high-surface-capacity zinc-iodine soft package battery is beneficial to promoting the development of the zinc-iodine battery to practical application.

The invention discloses a battery electrolyte and a preparation method thereof, an aqueous zinc-iodine battery and terminal equipment. The battery electrolyte comprises an additive, an electrolyte and a solvent, the additive contains an amino functional group, and the concentration of the additive is 0.1 g / L-0. 5 g / L. In addition, the additive can also utilize a nitrogen-containing functional group to reduce the shuttle effect of polyiodide and prevent the loss of an iodine positive active material, so that the electrode of the zinc ion battery is protected, and the cycle life of the zinc ion battery is remarkably prolonged (the capacity is about 20mAh / g higher than that of an electrolyte without L-tyrosine).

The invention discloses a preparation method of a hydroxy ketone compound based on electrosynthesis and the hydroxy ketone compound prepared by the preparation method, and belongs to the technical field of preparation of hydroxy ketone compounds. The preparation method of the hydroxyl ketone compound based on electrosynthesis comprises the following steps: in a protective atmosphere, in an organic solvent, taking an epoxy compound as shown in a formula 1, an aryl iodide as shown in a formula 2 and a carbon monoxide source as reaction raw materials, and under an electrochemical condition and the action of an accelerant and a metal catalyst, carrying out electrosynthesis on the reaction raw materials to obtain the hydroxyl ketone compound based on electrosynthesis. Carrying out electroreduction carbonylation reaction to obtain a hydroxy ketone compound as shown in a formula 3; the reaction process is shown as a reaction formula (1). According to the method, metal powder is prevented from being used as a reducing agent, the operation method is simple and convenient, and the safety is good. # imgabs0 #

The invention relates to the technical field of chemistry, in particular to a synthesis process of 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride, which comprises the following steps: by taking 4-fluoro-3, 5-dimethylbromobenzene as a raw material and hydrazine hydrate as a hydrazine source, matching with alkali such as potassium hydroxide, sodium hydroxide or potassium phosphate and the like, reacting at the temperature of 60-80 DEG C to obtain the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride. The preparation method comprises the following steps: by taking copper or nickel source catalysts such as cuprous bromide, cuprous iodide, nickel salicylate and the like, N, N-bis (2, 6-dimethylphenyl) oxamide as a ligand, hexadecyl trimethyl ammonium bromide as a stabilizer and a dioxane-water mixed system as a solvent, reacting at 80-110 DEG C under the protection of nitrogen, separating a reaction mixed solution after the reaction is finished, and separating the reaction liquid to obtain the target product. And purifying to obtain a finished product of the 4-fluoro-3, 5-dimethyl phenylhydrazine hydrochloride. Therefore, the problems that the synthesis of the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride is poor in safety, low in production efficiency, poor in environmental friendliness, small in substrate application range and the like are solved.

The invention relates to the technical field of chemical intermediates, and particularly discloses a preparation method of a givelastat intermediate.According to the preparation method, an initiator compound 5 can be synthesized by adopting cheap 2-hydroxy-6-naphthoic acid (CAS: 16712-64-4, 141 yuan / kg), and the preparation method is different from a method in the prior art. A gemvelastat intermediate compound 4 is synthesized from a compound 5 through a three-step reaction, compared with the prior art, the yield is high, industrial amplification production is more facilitated, in the process of synthesizing a compound 6 from the compound 5, acetonitrile can be adopted as a cyanide source in a reaction system, activated hydroxyl is subjected to a coupling reaction, and the yield is high. In the process of synthesizing a compound 6 from a compound 7 instead of a traditional metal cyanide, or in the process of synthesizing a compound 6 from another compound 5, a cheap cuprous cyanide and cuprous iodide system is adopted for a coupling reaction, and in the process of synthesizing a compound 4 from a compound 7, an acetic acid and sodium triacetoxyborohydride reaction system is adopted, so that the compound 6 is synthesized. And the important intermediate of the givelastat can be obtained with high yield.