30results about How to "Long reaction cycle" patented technology

The invention relates to a preparation method of sodium carboxymethyl cellulose, aiming at providing a preparation method of the sodium carboxymethyl cellulose for improving a free fiber yarn contained in a water solution. The preparation method for improving the free fiber yarn contained in a sodium carboxymethyl cellulose water solution comprises the following steps: respectively crushing purified cotton and wood pulp, and successively adding the crushed purified cotton and wood pulp to a kneader with a sodium hydroxide water solution and an ethanol water solution together; vacuumizing the kneader, filling an inert gas, and carrying out alkalization reaction at constant temperature of 38-50 DEG C for 40-120 minutes; adding an etherifying agent, increasing temperature to 75-80 DEG C, and carrying out etherifying reaction at constant temperature of 75-80 DEG C for 30-90 minutes; and washing, neutralizing, centrifugalizing, drying and crushing a reaction product to obtain a sodium carboxymethyl cellulose finished product. According to the sodium carboxymethyl cellulose prepared through the method disclosed by the invention, the sodium carboxymethyl cellulose water solution is clear and transparent and contains no free fiber yarn so as to be applied to the industrial field with strict requirements on the free fiber yarns.

The invention provides a method for improving quality and reaction period in the production of gasoline by using low-carbon hydrocarbons, which belongs to the technical field of low-carbon hydrocarbon aromatization. The method adopts a reaction equipment system, and is characterized in that: the equipment system consists of a heating furnace, a reactor, a cooler, a gas-liquid separation tank and a flash drum, which are connected in turn. A low-carbon hydrocarbon material and a dry gas are mixed and introduced into the heating furnace to be pre-heated to 250 to 450 DEG C, the heated mixture is transferred to a reactor under a pressure of 0.8 to 205MPa, the reaction solution is cooled by a cooler to 35 to 45 DEG C and then transferred to the flash drum for flashing to remove dry gases having less than 4 carbon atoms, the dry gases are mixed with the rich gas on the top of an enterprise separation tank, the mixed gases are exhausted from the device, and the crude gasoline at the bottom of the flash drum is refined to produce high-grade gasoline. The method of the invention is simple and easy to implement; the equipment flow is short; the gasoline component distribution is improved; the quality of the gasoline is improved; the operation is safe and stable; the period is doubled; and the effect is obvious.

The invention relates to a preparation method and application of a hydrostable nano complex. The preparation method comprises the following steps: dissolving zinc nitrate in water to obtain a zinc nitrate water solution, adding the solution into a dimethylformamide solution of triazinyl tribasic carboxylic acid, and blending by shaking; carefully adding anhydrous ethanol and a potassium hydroxide water solution into the supernatant of the mixed solution, blending by shaking to obtain a colloid homogeneous liquid, standing, carrying out centrifugal separation, and washing the obtained solid to obtain the nano triazinyl complex; and adding DMF (N,N-dimethylformamide) and hexamethyne diisocyanate into the prepared nano triazinyl complex under stirring conditions, keeping the temperature, cooling the solid, separating, washing and drying to obtain the hydrostable nano complex material. The nano complex material has the advantages of small particle size and high specific area, has abundant imino (-NH-) active sites in the structure, has higher capacity for adsorbing Hg (II) pollutants in water, and thus, has favorable industrial application prospects.

The invention relates to the technical field of compound synthesis and in particular discloses a synthetic method of a mercapto functionalized polyaryl carboxylic acid compound. The synthetic method concretely comprises the following steps: in the presence of a palladium catalyst, putting aryl fluoride, aryl boric acid and alkali metal salt serving as raw materials into a mixed system of water / organic solvent, and carrying out a series of subsequent reactions including Suzuki reaction to obtain the mercapto functionalized polyaryl carboxylic acid compound. According to the synthetic method disclosed by the invention, as the Suzuki reaction is realized in the air environment firstly, the reaction condition is greatly simplified, the reaction time is shortened from 2d to 1h, and the productivity and the yield are greatly increased; in addition, by adopting the environment-friendly solvent, the environment is beneficially protected; the mercapto functionalized polyaryl carboxylic acid compound synthesized by utilizing the synthetic method can be largely applied to metal organic compounds to build a series of novel porous materials with novel structures and excellent performances.

The invention relates to a novel efficient and environment-friendly catalyst for waste tire oil regeneration. The novel efficient and environment-friendly catalyst comprises the following preparation steps: step 1, manufacturing a catalyst A; step 2, manufacturing a catalyst B; produced diesel oil is changed to be light yellow, the density reaches 0.86-0.88, the odor is basically eliminated, the values of hexadecane and octane in the diesel oil are high, C2 dry gas in pyrolysis gas is less, the liquid yield is up to above 80 percent, a pour-point depression effect is realized, and a pour-point can be controlled to be 0 to minus 20 DEG C. The catalyst has the benefits that the service life is long, about 800 tons of tire oil can be processed by one ton of catalyst and be regenerated for 2-3 times, the cost is improved by about 50 yuan / ton to 100 yuan / ton, complicated acid and alkali washing processes are omitted, the sales price is higher than 500-1000 yuan compared with that of oil produced without using the catalyst, the content of sulphur in the oil is low, the catalyst is taken as fuel and is used for directly burning tail gas, and the emission is up to standard, so that the environment-friendly and pollution-free standards are completely achieved.

The invention discloses a method for preparing a d-phenylanine compound by using a microchannel reaction device. The method comprises the following steps: (1) mixing an aniline compound I, an acid and heavy water, implementing ultrasonic treatment evenly to obtain a mixed solution; and (2) pumping the mixed solution obtained in the step (1) into a microchannel reactor of the microchannel reaction device, reacting under the action of a microwave field or ultrasonic wave; and collecting a reaction liquid after finishing the reaction to obtain the d-phenylanine compound II. The method has the advantages of higher conversion rate, higher deuterium content, higher yield and reduction of the quantity of the heavy water used in the reaction. Therefore, the post-processing is simple, and a high-purity product is obtained.