3 results about "Cyanoacetamide" patented technology

The application discloses a catalyst for preparing malononitrile, a preparation method of the catalyst and a method for preparing malononitrile by using the catalyst. The catalyst is a solid catalyst, which is an acidic catalyst loaded with rare earth metal oxide. The method for preparing malononitrile is that cyanoacetic acid or cyanoacetate or cyanoacetamide and an ammonia source are subjected to ammoniation dehydration reaction in a continuous reactor to prepare malononitrile according to a certain molar ratio. Then, vacuum distillation (20 torr-25 torr) is carried out, and a fraction collected at 110 DEG C-120 DEG C is malononitrile product. The ammonia source can be ammonia gas, ammonia water, ammonium carbonate or urea. The method for preparing malononitrile can reduce production cost, improve production safety, reduce the discharge amount of three wastes in the preparation of malononitrile by using an existing process, and improve product quality, and is a sustainable and green synthesis route.

The application belongs to the technical field of medicine synthesis, and particularly relates to a gemigim intermediate compound and a preparation method thereof. The gemigim new intermediate compound is obtained by reacting alpha-cyanoacetamide, triethyl orthoacetate and triethyl orthoformate as starting materials. The new intermediate is cyclized to obtain a gemigim key intermediate compound 3-cyano-4-methoxy-2(1H)-pyridinone. The new intermediate synthesis method provided by the application is simple, triethyl orthoformate is used as a 'one-carbon unit' donor, the reagent only produces ethanol in the cyclization process, the use of DMF-DMA can be effectively avoided, and then the generation of dimethylamine gas or its acetate salt is avoided, so that the reaction operation is safer and more environmentally friendly.

The application discloses a purification method of C5-C7 components in bio-naphtha, and particularly relates to the technical field of bio-naphtha purification, and comprises the following steps: mixing bio-naphtha with a specific impurity removal reaction liquid, standing, centrifuging, suction filtering to remove water, inorganic salt and acidic gas, and obtaining impurity-removed naphtha; then mixing the impurity-removed naphtha with a target extraction liquid for extraction, distilling to recover the solvent, and rectifying and separating to obtain high-purity C5-C7 components. The impurity removal reaction liquid is prepared from 2-cyanoacetamide and 3-aminopropyl triethoxysilane under the catalysis of anhydrous zinc chloride, and the target extraction liquid is prepared from alpha-angelica lactone and 1-phenylethylamine under the action of triethylamine. The method is simple in operation, mild in conditions, and can efficiently remove impurities, the purity of C5-C7 components is up to 99.8%, the extraction yield is up to 95%, the recovery rate of n-pentane is high, the problems of poor purification effect and high energy consumption in the prior art are solved, the method is suitable for industrial production, and the utilization value of bio-naphtha is improved.