130results about "Preparation by ammonia-carboxylic acid reaction" patented technology

The invention provides a fluid-bed catalyst, which can withstand high voltage and high load, contains non corrosive halide, and has a high single-pass yield. The catalyst comprises metal oxide containing multi active component of Mo, Bi, Fe, Ni and Sm, and a carrier of SiO2, Al2O3 or the mixture. It can be used to prepare the high selective acrylic with propone. Comparing with the prior technique, in the condition of keeping the single- pass yield of acrylic, with the invented catalyst, production capacity of fluid-bed reactor can be improved by 20- 30%, and the usage of the catalyst can decreases by 35%.

The invention discloses a method for synthesizing acetonitrile through a one-step ammoniating method with acetic acid. The method comprises the following steps of: (1) reacting acetic acid with liquid ammonia in a fixed-bed reactor provided with a catalyst of aluminum oxide to generate a mixed gas containing the acetonitrile; and (2) continuously refining the gas mixture to obtain an acetonitrileproduct. By adopting the method, the acetonitrile product is relatively pure, the purity can reach more than 99.9%, the separation process is relatively simple, the process is short, the energy consumption in the production process is low, the energy consumption of a unit product is about 40% of the energy consumption with a by-product method, and the cost is lower. The separation process adopts a physical separation method, and avoids the problem of generating a great deal of wastewater and waste gas in the chemical process in the by-product method. Meanwhile, because the synthesis method isadopted, the limitation that the yield is restricted by the main product can be thoroughly avoided.

The invention relates to a method and equipment for production of adiponitrile from adipic acid, and mainly solves the problem of unstable product quality in the prior art for production of adiponitrile from adipic acid. The method employs materials of fusing adipic acid, ammonia, phosphate and a diluent. The production method is as below: mixing phosphoric acid with the diluent in a pipeline mixer; conducting neutralization of adipic acid and ammonia in a cyanation reactor; sending reaction products into the bottom of a separation tower for separation; recovering gas phase of light components from an outlet; sending the diluent recovered by a gas lifting plate into the pipeline mixer, mixing the diluent with phosphoric acid in the pipeline mixer, and sending the mixture into the cyanation reactor to dilute adipic acid; and sending a liquid phase to a scraper type evaporator. The employed equipment includes an adipic acid storage tank, an ammonia compressor, a cyanation reactor, a pipeline mixer, a separation tower, a tail gas removal tower, a phosphoric acid storage tank and a scraper type evaporator. The invention has the advantage of a good quality of the produced adiponitrile product.

The invention discloses a method for synthesizing hexanediamine by taking caprolactam as a raw material. The method comprises the following steps that (1) after the hexanediamine, alkali and water aremixed, heating reflux is conducted, and thus 6-amino-caproate is obtained; (2) the 6-amino-hexanoate obtained in the step (1) is introduced into an amino protecting group to protect an amino end group, then acid is added for neutralization to generate aminocaproic acid with the amino protecting group; (3) after a product obtained in the step (2) is dried, a dehydration catalyst for amide is added, a heating reaction is conducted in the presence of an ammonia source to convert a carboxylic acid group into a cyano group, and thus product nitrile is obtained; and (4) after the product nitrile obtained in the step (3) is extracted and purified, catalytic hydrogenation is conducted to generate corresponding amine, then the protecting group is removed, and thus a target product can be obtained.

The invention discloses a preparation method for long carbon chain nylon PA1313. The preparation method comprises the following steps: taking 1,13-tridecanedioic acid as a raw material; preparing 1,13-tridecylamine through cyanation and amination; preparing PA1313 salt by taking 1,13-tridecylamine and 1,13-tridecanedioic acid as raw materials and water as a solvent; putting PA1313 salt and water at a certain ratio into a polymerizing kettle; performing melt polymerization, thereby acquiring PA1313 with a certain molecular weight. In the cyanation step of the method, an ammonia gas recycling technique is adopted, so that the use ratio of ammonia gas is greatly increased and the emission of wastewater and exhaust gas is reduced; in the salt forming and polymerizing process, water is used forreplacing ethyl alcohol as a reaction medium, so that the safety of industrial production is promoted, the safety level of equipment is reduced, the investment in equipment is reduced and the recycling cost of solvent is lowered.

The invention relates to a preparation method of adiponitrile. The preparation method comprises the following steps: firstly performing a reaction on adipic acid and ammonia at 155-200 DEG C to produce diammonium adipate, and then dehydrating under a catalytic reaction of phosphoric acid or ammonium phosphate to produce adiponitrile; a product can be further separated in a separation tower. The reaction is performed on the adipic acid and the ammonia gas at the low temperature of 155-200 DEG C to produce H4NOOC(CH2)4COONH4 first, and then high-temperature cyanation is performed, so that the opportunity of producing a by-product and a coke from the adipic acid at high temperature is effectively avoided, not only the yield is increased by 3-5%, but also the operation cycle of a production device is prolonged by 30-60 days, and the production per unit time is increased. Liquid phosphoric acid is used as a catalyst, firstly ammonium salt of the phosphoric acid is produced, and the ammoniumphosphate can be mixed with ammonium salt of the adipic acid very well, so that the catalytic performance is improved better and the selectivity of the adiponitrile is increased by more than 2%.

The invention provides a method for producing a hexamethylenediamine key intermediate 6-aminocapronitrile by a continuous gas-phase two-step method. The method comprises the following steps: S1, mixing caprolactam and water in a gas phase state to carry out continuous hydrolysis or mixing caprolactam and ammonia water in a gas phase state to carry out continuous hydrolysis ammoniation reaction toobtain a first product system containing 6-aminocaproic acid, 6-aminocaproic acid ammonium salt and/or 6-aminocaproamide; and S2, carrying out continuous gas-phase catalytic ammoniation and dehydration reaction on the first product system and ammonia gas to obtain a second product system containing 6-aminocapronitrile. According to the patent of the invention, the problem that water generated by reaction in a one-step process promotes polymerization reaction of the raw material caprolactam is reduced from the source, and the selectivity of aminocapronitrile is improved; and the problems of catalyst deactivation and pressure drop rise caused by polymerization and coking of caprolactam in the reactor are effectively reduced, the stability of the device is improved, and the service life of the catalyst is prolonged.

The invention discloses a method for synthesizing high purity acetonitrile by ammoniating acetic acid; acetic acid and liquid ammonia are respectively vaporized, acetic acid is preheated to 100-250 DEG C, liquid ammonia is preheated to 100-300 DEG C, the preheated two gases enter a reactor for mixing, ammoniation reaction is carried out under the action of an acetic acid ammoniation catalyst to obtain acetonitrile. The invention has available materials, simple technology, easy operation and high purity of the product.

The invention discloses a synthesis method of perfluoroisobutyronitrile, comprising the following steps of: (1) carrying out a reaction between oxalyl chloride monoester and fluoride salt in a solventto obtain oxalyl fluoride monoester; (2) carrying out a reaction between oxalyl fluoride monoester and hexafluoropropylene in a solvent by taking fluoride salt as a catalyst to prepare heptafluoro-2-carbonyl-3-methylbutyrate; (3) carrying out catalytic decarbonylation on heptafluoro-2-carbonyl-3-methylbutyrate in a solvent through cesium fluoride, so as to obtain heptafluoroisobutyrate; and (4) carrying out a reaction between heptafluoroisobutyrate and ammonia, and dehydrating to obtain perfluoroisobutyronitrile. The synthetic method has the advantages of easily available raw materials, mildreaction conditions, high raw material conversion rate and product yield, safe and simple process operation, and easy realization of industrial production.

The invention discloses a continuous production method for industrially preparing 2,3-difluorobenzotrifluoride and 3,4-difluorobenzonitrile. The preparation process of the 2,3-difluorobenzotrifluoride comprises the preparation step of an intermediate raw material for benzene sulfonamide and benzenesulfonylurea herbicides, and the preparation process of the 3,4-difluorobenzonitrile comprises the preparation step of a cthalofop-butyl intermediate raw material. The method is suitable for industrial production; and compared with the prior art, the method has the advantages of low cost, high production method and less pollution.

The invention discloses a solid phosphorus acid catalyst for producing adiponitrile and a preparation method of the solid phosphorus acid catalyst. The preparation method of the solid phosphorus acid catalyst comprises the steps as follows: diatomite is impregnated in a phosphoric acid and sulfate mixed solution, and a carrier is separated through centrifugation after impregnation balance, and then drying and roasting are performed, wherein the concentration of phosphoric acid is 55wt%-95wt%, the concentration of sulfate is 15wt%-25wt%, the roasting temperature is 300-700 DEG C, sediment is cooled and then subjected to preforming, particles between 10 meshes and 50 meshes are screened, and the solid phosphorus acid catalyst is formed. One novel green catalyst is developed for production of adiponitrile with an adipic acid liquid phase method, and the catalysis effect is improved while various defects caused by traditional catalysts are overcome.

The invention discloses a method for preparing azelaic diamine. Azelaic acid is taken as a raw material, azelaic dinitrile is prepared through a neutralization reaction, a dehydration reaction and a decompression reaction sequentially, and azelaic diamine is prepared through a hydrogenation reaction of the azelaic dinitrile. Compared with the prior art, the method has the advantages as follows: a process route with a simple process and extremely high efficiency and yield is provided; meanwhile, renewable biomass resources are taken as raw materials and are wide in source, and all the processes are relatively simple and can be implemented, so that the method has great social significance and great economic value.

The present invention relates to a process for the preparation of primary di- and/or triamines of high purity from nitriles which can themselves originate from dimer and/or trimer acids.

This process comprises a stage of ammoniation of the acid functional groups and a stage of hydrogenation of the nitrile functional groups to give primary amine functional groups and does not require additional purification stage(s).

The invention discloses a catalyst for synthesizing p-hydroxybenzonitrile (2-hydroxybenzonitrile) and a preparation method of the catalyst. Phosphoric acid, copper nitrate, stannous oxalate and ammonium molybdate are dissolved in deionized water, an impregnation liquid is prepared, and a bar-shaped Silicalite-1 molecular sieve is impregnated in the impregnation liquid for 12-24 h at the room temperature; the impregnated molecular sieve is dried in a drying oven at 80-120 DEG C for 6-24 h and roasted in a muffle furnace at 450-600 DEG C for 4-12 h, and the catalyst is obtained. The catalyst is prepared from active components in terms of the mass percentage of the carrier as follows: 0.5-15% of P2O5, 0.1%-3.0% of CuO, 0.5%-4.5% of SnO and 0.2%-2% of MoO3. The catalyst is prepared with a conventional impregnation method, and the technological process is simple and easy to operate; the all-silicon molecular sieve is used as an active carrier and has a synergistic effect with all active oxide components, and the prepared catalyst is applicable to the continuous production process of p-hydroxybenzonitrile (2-hydroxybenzonitrile) by use of a fixed bed reactor and has the advantages of high raw material conversion rate, high product selectivity and long service life in the p-hydroxybenzonitrile (2-hydroxybenzonitrile) synthesis process.