50 results about "Sodium phenoxide" patented technology

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.

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.