54 results about "N-Methylaniline" patented technology

The invention relates to a corrosion inhibitor and a preparation method thereof. The corrosion inhibitor comprises, by weight: 50-70% of Mannich base, 10-20% of phosphate, 10-20% of isopropanol, and 10-20% of sodium molybdate. The preparation method of the corrosion inhibitor comprises: adding N-methylaniline into a three-neck flask, heating the flask to 80 DEG C, and adjusting the pH value to 2 with concentrated hydrochloric acid; heating the flask to 95 DEG C, adding acetone into the flask, and heating the flask to 150 DEG C; adding formaldehyde and benzaldehyde into the flask, maintaining the temperature at 150 DEG C, and performing reflux for 4h while performing stirring to obtain Mannich base; and compounding, by weight, 50-70% of Mannich base, 10-20% of phosphate, 10-20% of isopropanol, and 10-20% of sodium molybdate to prepare the corrosion inhibitor. The corrosion inhibitor can be used at a high temperature of 180 DEG C. When the concentration of the corrosion inhibitor is 100 ppm, an N80 iron sheet is corroded by stratum water of the Tahe Oilfield for 6h at 180 DEG C, and the corrosion inhibition rate is 90.04%.

The invention discloses a hellebore aldehyde synthetic method. The method comprises the following steps of: synthesizing veratrole through methylation reaction by using pyrocatechol as a material; and synthesizing N-methylformanilide through formylation reaction using N-methylaniline as a material; reacting veratrole with N-methylformanilide at 20-100 DEG C for 8-24 h in the presence of a condensing agent and a catalyst to prepare the product with the purity of more than 97%. The invention is a clean and efficient synthesis method, the cost of the materials used in the invention is low, the formylation reagent can be recycled, and the industrial wastewater is less.

The invention discloses a method for preparing buprofezin, which adopts benzene, chlorobenzene orhomologue as the solvent during the photochemical chlorination producing process of buprofezin to replace carbon tetrachloride used in the prior art. The phosgenation, chlorination and desolvation operations are performed on N-methylaniline to get the solution with the N-chloromethyl-phenyl-amido-formyl chloride. The invention has the advantages that average photochemical chlorination yield of the N-methylaniline is more than 80%, and buprofezin content in the finished product is more than 95.0%; benzene, chlorobenzene or homologue can entirely replace carbon tetrachloride to process industrial buprofezin production so as to avoid the environment pollution.