40results about How to "Simplify recycling steps" patented technology

The invention relates to a method for preparing meta-position aramid fibers. The method is characterized by comprising the following steps: specially preparing a spinning solution of three components such as poly(m-phenyleneisophthalamide), hydrogen chloride and N, N-dimethylacetamide through adopting polymerization; deaerating the solution, then heating the solution, extruding the solution through a spinneret plate to enter a spinning hot channel, and removing solvents such as the N, N-dimethylacetamide and the hydrogen chloride through the hot channel so as to obtain nascent fibers; and stretching the nascent fibers through the solvent, washing to further removing the hydrogen chloride and the solvent in the nascent fibers, then drying, dry heating and stretching, cooling and oiling to obtain the finished fibers. The poly(m-phenyleneisophthalamide) spinning solution does not contain salt, and the deionized water and the solvent instead of salt are used in a whole fiber production process, so that the finally prepared meta-position aramid fiber products are low in ion content and fiber ash content; and solvent recovery steps are simplified, and energy sources are greatly saved.

The invention discloses a composite extraction system and an extraction method for extracting lithium from lithium-containing brine. The composite extraction system is loaded with 2.5-10.4g / L of Fe(III), including 10%-60% of extractant A and 10%-30% of extractant B, and the balance is diluent, wherein the extraction The agent A is a neutral phosphine extractant and / or an amide extractant, the extractant B is an acidic phosphine extractant, and the percentage is the volume percentage in the composite extraction system. The composite extraction system of the invention can effectively extract lithium from lithium-containing brine, especially can effectively strip lithium at a pH of 1.0-1.8, avoid the corrosiveness of high-acid stripping to equipment, and lithium in stripping liquid easy to recycle.

The invention relates to a recovering device for recovering a UUV (underwater unmanned vehicle) on the water surface of a USV (unmanned surface vehicle) based on a flexible arm. The recovering deviceis characterized by comprising a recovering control module, an oil path control unit, a hydraulic oil filling device, a flexible capturing belt and a suspending swing arm device; the recovering control module is arranged in a cabin of the USV; one end of the suspending swing arm device is arranged on a deck on the USV, and the other end of the suspending swing arm device is connected with the hydraulic oil filling device; a rolling wheel is arranged in the center position of the hydraulic oil filling device; the flexible capturing belt is curled on the rolling wheel; the oil path control unitis arranged on the hydraulic oil filling device; the recovering control module is sequentially connected with the oil path control unit, the hydraulic oil filling device and the flexible capturing belt; and the recovering control module is connected with the suspending swing arm device. The recovering device has the following beneficial effects: the recovering method provided by the invention adopts a flexible arm technology, is suitable for recovering the revolved body type UUV, does not have any interface requirement on the UUV, avoids influence on the overall performance of the UUV and hasconcise recovering step.

The invention discloses a microwave synthesis method of 1,3-bis[2-(3,4-epoxycyclohexyl)ethyl]tetramethyldisiloxane. Including: (1) Under the protection of inert gas, sequentially add tetramethyldisiloxane, organic solvent, 4-vinyl-1,2-epoxycyclohexene into the reaction flask and stir, and then add the supported Pt / Y molecular sieve catalyst, finally add absolute ethanol, continue to stir to obtain a suspension; (2) move the suspension into a microwave synthesis reactor for reaction, after the reaction, the reaction solution is decompressed to remove solvents and low boilers, and then centrifuged , to give 1,3-bis[2-(3,4-epoxycyclohexyl)ethyl]tetramethyldisiloxane. The invention has mild reaction conditions, short reaction time, high conversion rate of raw material active hydrogen, excellent activity and stability of the catalyst, recyclable reuse, reduced cost, high yield of the prepared target product, and good industrialization prospect.

A chiral catalyst in a binaphthol synthesis technology is a 1,2-cyclohexanediamino-2-(3-hydroxy-2-naphthalenone)Schiff base-ferric iron complex, and the 1,2-cyclohexanediamino-2-(3-hydroxy-2-naphthalenone)Schiff base is generated through reacting (1R,2R) or (1S,2S)1,2-cyclohexanediamine with 3-hydroxy-2-naphthalenone. The structural formula of the chiral catalyst is shown in the specification. Cheap ferric iron same with the center ligand of the catalyst is adopted as an oxidant to carry out a chiral catalytic reaction, and the adoption metal ions as an oxidant can guarantee the high conversion rate of a product; the catalyst does not react with the oxidant to form impurities in a catalyst and oxidant recovery process, so a recovery step is simplified, and the recovery feasibility of the catalyst is improved; and the recycle of the catalyst and the oxidant can guarantee a high optical purity of the product, a high conversation rate and a high optical purity can be realized on the basis of a low cost, the pressure to the environmental protection is reduced, and the green chemistry is realized.

The invention discloses a modified hydroxypropyl methylcellulose for reinforced tile adhesive, which is prepared from the following raw materials in mass percentage: 54%-94% of hydroxypropylmethylcellulose, 5%-40% of starch ether , dispersant 0.5%-3% and rheological agent 0.5%-3%; wherein, hydroxypropyl methylcellulose is made from cellulose powder, granular alkali, liquid alkali, methyl chloride and propylene oxide; the preparation method is (1) Weigh each raw material; (2) Mix cellulose powder, granular alkali, liquid alkali, methyl chloride and propylene oxide, carry out etherification reaction, and then carry out neutralization, washing, centrifugation, drying and pulverization in sequence , to obtain hydroxypropyl methyl cellulose; (3) mixing and stirring hydroxypropyl methyl cellulose, starch ether, dispersant and rheological agent to obtain final product. The product obtained by the invention has stable quality, has the function of improving the tensile bonding strength of the tile adhesive, is applied to modern tiles with large size and high quality, and can significantly improve the safety of the tiles in use.

The invention relates to a method for recycling a positive electrode of a LiFePO4 battery. The method comprises the following steps: a, discharging and shelling the LiFePO4 battery, and separating the positive electrode, a negative electrode and a diaphragm; b, completely immersing a positive electrode plate into acid and taking out an aluminum foil current collector; c, adding acid into a leaching solution which is separated from the aluminum foil in the step b, and filtering and removing a conductive agent and an adhesive; d, adding alkali into the filtrate obtained in the step c, adjusting the pH value of the solution, filtering, and washing and drying a filter cake to obtain FePO4; e, adding alkali into the filtrate obtained in the step d, adjusting the pH value of the solution to be more than or equal to 12, heating, filtering, dissolving a solid compound obtained by filtration into the leaching solution obtained in the step b and extracting for the second time; and f, heating, concentrating and boiling the filtrate obtained in the step e, adding a Na2CO3 solution, reacting for 10 minutes to 1 hour, filtering and drying to obtain a pure Li2CO3 product. The method is simple and efficient.