50 results about "Sodium phenoxide" patented technology

A method for the carboxylation preparation of 2,5-dihydroxyterephthalic acid by taking n-octane as solvent to Pd(II) / C-catalyze the hydroquinone is disclosed, specifically comprising the steps of: in a high-pressure reaction kettle, taking sodium phenolate, potassium hydroxide and carbon dioxide as reactants, performing Pd(II) / C-catalysis to prepare 2,5-dihydroxyterephthalic acid sylvite, and obtaining the 2,5-dihydroxyterephthalic acid by means of recrystallization and acidification. The inventive catalyst is simply prepared, the solvent is easy for recovery and the product is high in purity.

An efficient synthesis method of salicylic acid belongs to the technical field of salicylic acid synthesis. The dehydration method adopted by the invention comprises the following steps: vacuumizing a sodium phenate solution for primary dehydration, adding phenol into the sodium phenate solution when the water content of the sodium phenate solution reaches about 45% such that a part of the phenol and water form a binary azeotrope, and separating the binary azeotrope under negative pressure condiction to achieve the purpose of taking out water by the phenol. The residual phenol and the sodium phenate form the bulky compound under the vacuum condition, and the bulky compound has the large specific surface area, such that the reaction rate is accelerated, the reaction time is substantially shortened, and the production efficiency is improved when the CO2 is introduced to perform the carboxylation reaction; meanwhile, the binary azeotrope and phenol separated in the process can be recycled, so that resources are saved, and the cost is reduced.

The invention relates to a method for leaching-evaporation-phase separation coupled separation and recovery of phenol, in particular using acetone-water mixed solvent as the leaching agent to leaching and separating the solid mixture of sodium phenate and sodium hydroxide, and then evaporating, liquid-liquid Phase separation to obtain phenol, while sodium hydroxide, acetone, and water can be recycled. The separation method of the present invention makes full use of the characteristics of the separated species and the characteristics of the separation process. Not only is the separation operation simple and easy, and the operation cost is low, but also other materials can be recovered and utilized as resources while separating and obtaining phenol. The process technology not only has industrial application value, but also has significant economic and social benefits.

The invention discloses a method for decomposing and recovering sodium phenolate by utilizing salicylic acid residue, comprising the following steps: adding water into a reaction kettle, starting stirring, and then adding solid salicylic acid residue; controlling the pressure in the reaction kettle, heating the reaction kettle When the material reaches 160-220°C, the reaction exhaust gas enters the condenser for condensation, and the phenol and water in it are condensed and refluxed into the reactor. Use water; after the reaction is completed, the pressure is released and cooled, and sodium hydroxide is added to the reaction kettle to control the pH value to be 12-13; finally, activated carbon is added to the reaction kettle, adsorbed and decolorized, and filtered to obtain a sodium phenolate solution. The method disclosed in the invention enables the salicylic acid residue to be recycled, only generates a small amount of activated carbon solid waste, has little impact on the environment, and belongs to an environment-friendly treatment process.

A method for treating hexaphenoxycyclotriphosphazene industrial wastewater, comprising the following steps: heating and evaporating the hexaphenoxycyclotriphosphazene industrial wastewater to obtain a solid-liquid mixture; adding organic Sodium phenate is dissolved in a solvent, and sodium chloride crystals are obtained after solid-liquid separation, washing and drying; the solution containing sodium phenate obtained after the solid-liquid separation is heated and evaporated to obtain a sodium phenoxide concentrate; After adding deionized water or crystallization mother liquor, heating and dissolving, after cooling, crystal seeds are added for crystallization, and sodium phenoxide trihydrate crystals are obtained through separation; the crystallization mother liquor is the mother liquor after sodium phenoxide crystallization. The present invention can effectively recover sodium phenate and sodium chloride in waste water, and the obtained sodium phenate and sodium chloride have relatively high purity, can be recycled and utilized, can also significantly reduce the COD value of waste water, and have significant economic and environmental benefits .

The invention provides a continuous synthetic method of phenoxy acetic acid and belongs to the technical field of preparation of a herbicide 2,4-D intermediate. The method comprises the following steps: simultaneously adding a sodium phenoxide aqueous solution and a sodium chloroacetate aqueous solution into a constant-pressure funnel provided with a heating sleeve to perform mixed reaction, and retaining the mixture in the constant-pressure funnel for 10-15min; overflowing reaction liquid into a 3-mouth flask containing dilute hydrochloric acid or dilute sulfuric acid at 15-20 DEG C; adjusting the pH value to 5-6 by using the dilute hydrochloric acid or dilute sulfuric acid; stirring for 0.8-1.2 hours at room temperature; and performing suction filtration to obtain white crystalline powder namely phenoxy acetic acid. According to the method provided by the invention, the sodium phenoxide aqueous solution and the sodium chloroacetate aqueous solution are simultaneously added into the constant-pressure funnel provided with the heating sleeve to perform reaction, so that the internal pressure can be kept unchanged, inverse suction can be prevented and the liquid in the funnel can flow downwards smoothly to improve the reaction efficiency; and moreover, during the preparation of the sodium chloroacetate solution, a Na2CO3 solution is dropwise added into chloroacetic acid slowly, and the chloroacetic acid is excessive, so that the reaction temperature can be beneficially controlled, and side reactions are reduced.

The invention discloses a chelating amphoteric collector and a preparation method thereof. The collector contains alkyl, ether, phenyl, hydroxyl, amine and carboxyl, the length of the alkyl is C 5 ~C 16 . The preparation method is that p-aminophenol reacts with sodium ethylate to generate p-aminophenol sodium, and then reacts with 1-chloroalkane to generate p-alkoxyaniline; under the action of nitric acid and sulfuric acid, it generates 2,6-dinitro-4 ‑Alkoxyphenylacetamide; diazotization, diazo group replaced by cyano group under copper powder and potassium cyanide, acidic hydrolysis to 2,6‑dinitro‑4‑alkoxybenzoic acid; with sodium sulfide Selective reduction of a nitro group with ammonium chloride, diazotization reaction, acidic hydrolysis to generate 2-hydroxy-6-nitro-4-alkoxybenzoic acid; reduction to generate the target product 2-hydroxy-6-amine ‑4‑Alkoxybenzoic acid. The chelating amphoteric collector has good collecting ability, selectivity and low temperature resistance, and can be combined with various fatty acids to form a composite collector.

The invention relates to a method for separating a quaternary mixture of acetone, toluene, sodium phenate and water, especially a separation mass percentage concentration of 20% to 40% acetone, 10% to 30% toluene, 5% to 20% sodium phenate, The rest is a mixed material composed of water. The quaternary mixture is separated by distillation to remove acetone, azeotropic distillation to remove toluene and water, solid-liquid separation, condensation and drying. The method of the invention realizes the resourceful separation and recovery of the mixture of acetone, toluene, sodium phenate and water, the separation process is reasonable and the process is simple. It not only reduces the separation steps and energy consumption, but also has a high utilization rate of valuable components, is easy to realize continuous operation, and the separated products can realize resource utilization. Effective resource separation and recovery technology.