42results about How to "Improve recovery yield" patented technology

The invention provides a method for recovering highly pure potassium chloride from a fluorination reaction byproduct. The method comprises the following steps: 1, preprocessing: carrying out heat treatment on the fluorination reaction byproduct to remove adhered organic matter wastes; 2, dissolving and separating: placing a preprocessed solid mixture in a separation device, introducing liquid ammonia to dissolve potassium fluoride in the preprocessed solid mixture to form a mixed solution, filtering the mixed solution to obtain a filter cake which is crude primary potassium chloride and a filtrate which is a liquid ammonia solution of potassium chloride, squeezing the filtrate, introducing the squeezed filtrate to a pressure reducing chamber, and reducing the pressure to normal pressure to gasify the liquid ammonia in the filtrate in order to obtain a pure potassium fluoride solid; 3, washing: adding a mixed solvent A to the crude primary potassium chloride, washing the crude primary potassium chloride to remove residual trace impurities, and filtering the washed crude primary potassium chloride to obtain crude secondary potassium chloride; and 4, purifying: adding deionized water to the crude secondary potassium chloride, heating the deionized water to dissolve the crude secondary potassium chloride in order to prepare a saturated solution, cooling the saturated solution to room temperature, adding a solvent B to carry out re-crystallization, filtering the obtained solution, washing obtained crystals with the solvent b, and drying the washed crystals to obtain highly pure potassium chloride.

The invention discloses a reduction tank assembly with a rotary stirring inner core structure for a vertical reduction furnace. The reduction tank assembly comprises a vertical reduction tank body (1), wherein a mounting frame (2) is arranged at the outer upper end of the reduction tank body (1), a driving motor (3) and a speed reducer (4) are mounted on the mounting frame (2), an output shaft ofthe speed reducer (4) serves as a rotating inner shaft (7), the rotating inner shaft (7) is externally sleeved with a rotating outer shaft (6), the rotating outer shaft (6) stretches into the reduction tank body (1) and is connected with a rotating core shaft (5) through a coupler (8). The reduction tank assembly is reasonable to design and is particularly suitable for stirring materials in the reduction process of a metal magnesium vertical tank reduction furnace. The reduction tank assembly is also suitable for the stirring heating of materials in the reduction procedure of other metal vertical tanks, the heating uniformity of the whole materials can be realized according to the heating requirements, and the materials on an inner layer are effectively reduced, so that the reduction yieldis maximized, and meanwhile, the reduction time is greatly shortened.

The invention provides a corn starch process water protein recovery technique which comprises the following steps: 1) treating process water, which is generated in the gluten concentration step in a wet-grinding technique for producing corn starch, to obtain a first permeation solution and a first trapped fluid containing rich com gluten meal; 2) filtering the first permeation solution through a hyperfiltration membrane with the molecular weight cut-off of 10-200 kDa under the conditions of 3-4 Bar and 35-45 DEG C to obtain a second permeation solution and a second trapped fluid containing rich soluble proteins; and 3) heating the second trapped fluid at 75-150 DEG C for 0.3 second-31 minutes, coagulating to precipitate a first protein product, separating to obtain a first protein product and a separation liquid, and concentrating and drying the separation liquid to obtain a second protein product. The recovery technique overcomes the defect that the traditional technique only treats the insoluble com gluten meal in the process water generated by the gluten concentration step, can obtain the two protein products, and can enhance the yield of the com gluten meal.

The present invention has an object to solve the problem in a method for separating nucleated cells from a cell-containing fluid using a cell separation filter. Specifically, the present invention provides a cell separation filter and a method for preparing cells using a cell separation filter, which are capable of reducing unnecessary cell contamination in a nucleated cell fraction without needs of designing non-woven fabrics to suit cell species to be recovered. The present invention also provides a cell separation filter and a method for preparing cells using the filter capable of improving the recovery yield of nucleated cells. The present invention provides a cell separation filter comprising: a container having an inlet and an outlet, an adsorbent filled in the container, and a partition having an opening, the partition separating the adsorbent. The present invention also provides a method for preparing nucleated cells including the steps of: introducing a cell-containing fluid through the inlet of the cell separation filter to contact the cell-containing fluid with the adsorbent; and recovering a nucleated cell fraction from the filter.

The invention provides a method for enriching and recovering zinc by using a rotary kiln. Send the preheated kiln raw materials into the kiln tail of the variable diameter rotary kiln, and blow coal powder and oxygen-enriched air into the kiln tail to carry out the calcination reaction for 80-100 minutes; The flow direction of the gas is consistent with the movement direction of the raw materials entering the kiln, and they all move from the kiln tail to the kiln head; collect roasted ore, grind ore and magnetically separate to obtain iron concentrate; the flue gas extracted by the exhaust fan is Collection and purification treatment, use the dust collection system to collect zinc-containing dust, mix and granulate it with the kiln raw materials, and obtain the mixed kiln materials, send them to the variable-diameter rotary kiln, and cycle through the calcination process and the zinc-containing dust collection process to achieve Circular enrichment of zinc; when the zinc content in the flue gas reaches more than 10%, directly collect the zinc-containing dust in the flue gas, and use the acid leaching process to recover zinc. The method can effectively improve the recovery rate of iron and zinc, prevent the ring formation of the rotary kiln, and has high efficiency and energy saving.

The invention relates to a preparation method of chiral 4-substituted oxazolidone, which belongs to the pharmaceutical chemistry technical field. Chiral amino acid ester or chiral amino acid ester salt is added into a solvent, supercarbonate is charged, chloro formate is titrated at the room temperature, and mixed for 5 to 8 hours at the room temperature after titration is completed, filtering isperformed, and the solvent is recovered to obtain an intermediate compound a; the intermediate compound a is adopted in an anhydrous chloride solution for accelerating the catalyst of borohydride, reaction is performed for 4 to 10 hours at 0 to 40 DEG C, the solvent is recovered, a citric acid solution is added, extraction is performed by using ethyl acetate, an organic layer is combined, the solvent is recovered, and then an intermediate compound b is obtained; potassium carbonate is added into the intermediate compund b, heating, back flow and water diversion are performed for 2 to 4 hours,pump filtering is performed before cooling down, the filter liquor is cooled and recrystallized, pump filtering and drying are then performed to obtain a white crystalline solid 4-substituted chiral oxazolidone chemical compound. The invention provides the preparation method of a 4-substituted chiral oxazolidone chemical compound, the invention aims at the problem of significant safe hidden danger caused when phosgene is adopted for acidylation and cyclization in the prior art.