36results about How to "Subsequent separation is simple" patented technology

The invention discloses a 2,2,6,6,-tetramethyl-4-piperidone continuous synthesis method. The 2,2,6,6,-tetramethyl-4-piperidone continuous synthesis method comprises the following steps of 1, filling an acidic resin into a fixed bed reactor, and carrying out heating so that a temperature of the fixed bed reactor is in a range of 40 to 70 DEG C, and 2, feeding acetone and ammonia gas into the fixed bed reactor according to a mole ratio of 3-9: 1 under the conditions of acetone hourly space velocity of 0.15 to 1.17h<-1> and ammonia gas hourly space velocity of 5.25 to 124.20h<-1>, and cooling the product to obtain a 2,2,6,6,-tetramethyl-4-piperidone crude product. The 2,2,6,6,-tetramethyl-4-piperidone continuous synthesis method has simple processes and a low cost, is suitable for industrial continuous production, does not adopt an organic solvent or water as a solvent, avoids the pollution produced by the organic solvent on the environment, has mild reaction conditions, can be carried out at a temperature of 40 to 70 DEG C, has low energy consumption, and avoids the influence caused by impurities produced at a high temperature on the product.

The invention provides a method for recycling phomei residue. The liquid-solid phase reaction between sulfide precipitation conversion agent and thiram slag not only makes the precipitation of thiram metal salt with relatively small stability constant into the corresponding metal sulfide precipitation, which is easy for subsequent separation, but also converts the corresponding thiram root into water-soluble thiram The organic components of thiram root can be recycled and reused in a green and efficient manner, effectively avoiding the harm caused by the organic matter to the environment. In the present invention, the solid slag obtained by solid-liquid separation after the reaction is preferably pickled to recover the contained metals, especially the high value-added cobalt, so as to realize the separation and recycling of various non-ferrous metals in the phylum slag.

The invention relates to a method for synthesizing symmetric urea compounds from nitrocompounds. The technical scheme is as follows: in the presence of carbon monoxide and water, by using nitrocompounds as the raw material, selenium as a catalyst and an organic alkali or inorganic alkali as a cocatalyst (or no cocatalyst is added), reaction is performed under the conditions of atmospheric pressure and no solvent to synthesize the symmetric urea compounds by one step, wherein the mol ratio of water to nitrocompounds is 1:1-1:2.5; the selenium accounts for 0.05-1 mol% of the nitrocompounds; the mol ratio of organic alkali or inorganic alkali to nitrocompounds is 1:10-1:4; the reaction time is 1-8 hours; and the reaction temperature is 35-95 DEG C. The invention is simple and safe to operate, and can synthesize the symmetric urea compounds from the nitrocompounds under the conditions of atmospheric pressure and no solvent by one step, and has the advantages of one-pot reaction, accessible raw material, no pollution, high selectivity and high yield; and after the reaction finishes, the catalyst can be separated and recycled.

The invention discloses an ultrasonic oxidation-extraction and deep desulfurization method for diesel oil. The method comprises the steps: firstly, uniformly mixing an oxidizing agent, a cosolvent and a catalyst, then, mixing the mixture with sulfur-contained diesel oil on line, and next, carrying out ultrasonic oxidative desulphurization reaction in an ultrasonic reactor; delivering the mixture after reacting into a settling tank for separating to obtain a catalyst-contained solvent to be recycled and diesel oil to be subjected to solvent extraction, and separating organic sulfur in the diesel oil to obtain desulfurized diesel oil; carrying out reduced pressure distillation on the extracted solvent, recycling the separated solvent, and retreating the separated organic sulfur. By using the ultrasonic oxidation-extraction and deep desulfurization method, not only can the oxidation performance of the oxidizing agent to organic sulfur be improved, but also the cosolvent can be used for extracting organic sulfur in the diesel oil to obtain the solvent in the ultrasonic oxidation reaction, a phase transfer catalyst is not needed to be additionally added, the subsequent separation operation is easy, and the sulfur content of the desulfurized diesel oil is not higher than 10ppm. In addition, the ultrasonic oxidation-extraction and deep desulfurization method has the advantages of no adoption of organic acid capable of corroding equipment, short process route and low oil loss.

The invention provides a preparation method of an iron ion exchange modified molecular sieve. The preparation method comprises the following steps of (1) adding reduced iron powder and a matrix molecular sieve in an iron salt solution for carrying out ion exchange reaction; (2) carrying out solid-liquid separation on the iron salt solution after finishing the reaction; (3) washing an obtained solid product for removing the residual iron salt; (4) drying the product after washing; and (5) placing the product in a magnetic field for carrying out magnetic separation, so as to remove the iron powder. The preparation method provided by the invention has the advantages that the iron ion exchange modified molecular sieve with high exchange degree is obtained through once exchange, oxidation of ferrous ions is prevented without protection of inert environment, the generated residual matters which are not exchanged on the molecular sieve in a process are removed, and the pure exchange product is obtained.

The invention relates to the field of vanadium slag wet process metallurgy and vanadium chemical industry, in particular to a method for vanadium extracting through low liquid-solid-ratio ammonification. According to the method, after raw materials containing vanadium is roasted, clinkers, water and ammonium salt are mixed according to a certain proportion; materials with a low liquid-solid ratio are formed and subjected to the low-temperature ammonification reaction, the vanadium in the clinkers reacts with the ammonium salt to form ammonium metavanadate, and the ammonium metavanadate formed at the low temperature exists in mixed slurry in a crystalline mode; after the mixed slurry is subjected to hydrotherm dissolution, a solution rich in the ammonium metavanadate is obtained; and after slurry filtering, filtrate cooling and crystallizing and separating and ammonium vanadate roasting, vanadium pentoxide products are obtained. Compared with a conventional vanadium extracting through ammonification, according to the method for vanadium extracting through low liquid-solid-ratio ammonification, the using quantity of the water and the ammonium salt are greatly reduced in the ammonification process, and volatilization of ammonia gas is obviously inhibited; and the slurry can be directly subjected to hydrotherm leaching to obtain the ammonium metavanadate solution after ammonification, the process of vanadium extracting through ammonification is greatly simplified, the process is easy to operate and control, efficient and clean extracting of the vanadium can be achieved, and the extracting rate of the vanadium reaches 90% or more.

The invention relates to a method for synthesizing CLT acid, which has the technical scheme that 2-nitro-4-methyl-5-chlorobenzenesulfonic acid is taken as raw material; under the condition that carbon monoxide and water exist, selenium is taken as catalyst, inorganic base or organic base is taken as catalyst promoter; and reaction is carried out at high temperature and high pressure, so that the CLT acid can be synthesized by a one-step method. The method is simple, convenient and safe, realizes aqueous phase reaction, and is easy in obtaining of raw material, free from pollution, high in selectivity and high in yield; and the catalyst can be recycled after the reaction.

The invention relates to a method for producing bromelain, in particular to a new method for industrially extracting bromelain with pineapple stems (plants) as the main raw material. It includes the following steps: (1) Pineapple stem cleaning → (2) Pineapple stem crushing → (3) Squeezing juice → (4) Coarse filtration → (5) Heat exchange → (6) Centrifugation → (7) Microfiltration → (8) Ultrafiltration → (9) Refining → Synthesis → (10) Vacuum freeze drying → (11) Crushing → Preparation → Packaging → Finished product. The method for producing bromelain has high enzyme extraction recovery rate (up to 0.2%), high enzyme purity, high enzyme activity (up to 3000GDU / g or more), good stability, energy saving and reduced production cost.

The invention discloses a method for preparing water-soluble vitamin E polyethylene glycol succinic acid ester. In the method, vitamin E succinic acid ester and polyethylene glycol are taken as raw materials and the method comprises the steps of performing an esterification reaction on the raw materials after catalysis reaction by using an acid catalyst, cooling the products to the room temperature and performing after-treatment on a reaction product to obtain the water-soluble vitamin E polyethylene glycol succinic acid ester. In the method, the water-soluble vitamin E polyethylene glycol succinic acid ester is synthesized by a one-step method without a reaction solvent, and has the advantages of no solvent consumption, readily available raw materials, high reaction concentration, capability of greatly accelerating reaction rate, few reaction steps, simple subsequent separation, high conversion rate, high yield, low production cost, high product quality and easy industrial production, reduction of the steps of organic solvent recovery, distillation and the like due to no use of other solvents in the reaction and environmental friendliness.

The invention relates to a preparation method of α-aminotributanone oxime silane, comprising the following steps: (1) uniformly mixing butanone oxime with an organic solvent, then evenly adding chloromethyltrichlorosilane dropwise, after the dropwise addition is completed , and reacted at 0-60°C for 1-6 hours; after the reaction, stand and separate layers, neutralize the upper liquid with an organic base, filter off the insoluble matter, and distill under reduced pressure to remove impurities to obtain chloromethyl tributylketoxime Silane; (2) Mix the organic amine and the organic solvent evenly, then evenly drop chloromethyl tributylketoxime silane, after the dropwise addition is completed, react for 2-10 hours at 10-70°C; filter off the insoluble matter, Reduced pressure distillation to remove impurities, that is, too. The invention does not need to add additional acid absorbent, the subsequent separation is simple, and the generation of by-products such as multi-substituted organic amines is less, the utilization rate of the amine is high, and the side reactions of the reaction system are easy to control; the product purity can reach more than 85%, The yield is above 85%.