8results about How to "Easy to refine" patented technology

The invention belongs to the technical field of functional sugar, and particularly relates to resistant dextrin with high dietary fiber content and a preparation method thereof. The preparation method comprises the following steps: mixing pea starch milk and liquefying enzyme, and liquefying to obtain liquefied liquid; the DE value of the liquefied liquid is 8-11%; carrying out molecular rearrangement reaction on the liquefied liquid under an acidic condition to obtain resistant dextrin; the mass content of dietary fibers in the resistant dextrin is greater than or equal to 93%. The pea starch is used as the raw material, the dextrin crude product feed liquid (liquefied liquid) with the appropriate DE value is easily obtained after liquefaction, the DE value of the liquefied liquid is controlled to be 8-11%, and the prepared resistant dextrin is high in dietary fiber content and good in digestion resistance.

This invention, entitled "A Low-Loss β-Carotene Microcapsule and Its Preparation Method," belongs to the field of microcapsule preparation technology. The technical problem to be solved is that during high-temperature melting, particulate all-trans β-carotene transforms into a molecular state, but this process generates a large number of cis isomers and results in significant content loss. Furthermore, the particle size and dispersibility of the particulate β-carotene prepared by grinding are still unsatisfactory, leading to low bioavailability and poor application effects. The key point of this technical solution is to prepare high all-trans molecular β-carotene microcapsules through a specific combination of treatments. This reduces content loss and cis-trans isomerization during the transformation of β-carotene from particulate to molecular state, thereby significantly improving the bioavailability of β-carotene microcapsules. Moreover, the preparation process is simple, cost-controllable, and suitable for large-scale industrial production.

This invention discloses a chemical-biological fusion method for cholesterol synthesis. Using plant-derived 21-hydroxy-20-methylpregn-4-en-3-one, also known as bis(2-hydroxy-2-yl)-3-one (BA), as a raw material, cholesterol is synthesized through a four-step reaction involving sulfonation, acetylation, enzymatic hydrolysis and reduction, and Grignard coupling. Addressing the drawbacks of traditional animal-derived cholesterol, which carries unpredictable risks of pathogenic bacteria and viruses, this invention uses plant-derived steroidal raw material BA to synthesize cholesterol. This method not only offers high safety, avoiding the risk of pathogenic bacteria and viral infections, but also utilizes the tandem catalysis of esterase and carbonyl reductase during synthesis, along with coenzyme regeneration, to obtain key intermediates with high stereoselectivity and in a safe and clean manner. This significantly shortens the cholesterol synthesis route, increases efficiency, simplifies operation, minimizes solvent recycling losses, reduces waste, and allows for mild reaction conditions. This method is safe, economical, and suitable for industrial production.

The invention relates to the technical field of metal processing, and discloses a waste copper refining device which comprises a conveying assembly, a magnetic separation assembly and a screening assembly, the conveying assembly comprises a support, a cross beam, a connecting rod, a base and a conveying belt, and the magnetic separation assembly comprises a mounting base, a main roller and an auxiliary roller. The conveying belt is additionally arranged for conveying waste copper raw materials, the base does not make direct contact with the support, dust accumulation on the side wall of the base can be avoided, the influence of dust generated in the refining treatment process on the device is reduced, the auxiliary roller drives the waste copper raw materials to be conveyed to the material storage equipment and is separated from the conveying belt for conveying, and magnetic materials are conveniently transferred; the magnetic separation efficiency is improved, impurities in the waste copper raw material are effectively removed, high-purity copper is recycled, meanwhile, large-particle harmful substances in the waste copper are isolated, the copper raw material is conveniently refined in cooperation with flotation equipment, pollution of the waste copper to the environment is reduced, limited metal mineral resources are saved, and the recycling efficiency is improved.

This invention discloses a highly efficient degassing refining agent for magnesium alloy ingots and its preparation method in the field of molten metal purification. The refining agent is composed of lanthanum fluoride-supported titanium carbide nanocomposite, calcium zirconate and graphene oxide nanohybrid, and various components such as anhydrous magnesium chloride, anhydrous sodium fluoride, anhydrous potassium chloride, metallic calcium powder, barium carbonate, and alumina micro powder in a specific ratio. Its preparation mainly includes: first, dispersing titanium carbide nanoparticles and reacting them with a lanthanum fluoride-containing solution, followed by hydrothermal treatment and calcination to obtain the lanthanum fluoride-supported titanium carbide nanocomposite; second, mixing a zirconium calcium salt solution with a graphene oxide dispersion, followed by urea co-precipitation, hydrothermal reaction, and calcination under a protective atmosphere to obtain the calcium zirconate and graphene oxide nanohybrid. This invention, through the synergistic effect of two inorganic modifying compounds, can deeply remove hydrogen and inclusions from magnesium melt, thereby significantly improving the metallurgical quality and overall performance of magnesium alloy ingots.

This invention discloses a method for preparing 4N ammonium permanganate from low-concentration rhenium-containing waste acid, which is divided into a crude refining stage and a refining stage. The crude refining stage includes a rhenium precipitation process, a leaching process, a hydrolysis process, an acidification process, an extraction process, a back-extraction process, and a crystallization process. The refining stage includes a crude ammonium permanganate dissolution process, an ion exchange process, an extraction process, a back-extraction process, a crystallization process, and a nitration-recrystallization process, ultimately obtaining ammonium permanganate with a purity of 99.99%. In the crude refining stage, this invention first prepares 4N ammonium permanganate from low-concentration rhenium-containing waste acid. Rhenium is efficiently and selectively enriched in concentrated waste acid to obtain a 1% grade rhenium precipitate. Then, a weak oxidation leaching process is used to remove impurities from the precipitate, followed by calcium hydroxide hydrolysis, acidification, high-efficiency extraction, back-extraction, and crystallization to obtain a crude ammonium perrhenate product with a grade of ≥99%. In the refining stage, the crude ammonium perrhenate is dissolved a second time, and a resin ion exchange, extraction, back-extraction, and crystallization process is used to obtain a refined ammonium perrhenate with a grade of ≥99.9%. Finally, a nitration-recrystallization process is used to remove impurities from the refined ammonium perrhenate to achieve a 4N grade quality.

The invention discloses a preparation method of a cast-rolling-pushing composite molded thick-wall high-performance elbow. The preparation method is simple, convenient and efficient in process, suitable for planned mass production of thick-wall elbows, low in cost and stable in quality. According to the method, (1) an intermediate-frequency smelting furnace is firstly adopted for smelting and tempering alloy to obtain alloy melt, and then refining is performed through furnace bottom argon blowing, so that the alloy can be better refined, and the quality and the stability of the final elbow are improved; and (2) the steel wire roller brush rotates to polish and clean the inside and the outside of the pipe blank at high temperature (such as about 700 DEG C), so that impurities and dross thereof are efficiently removed. And (3) the residual temperature (about 600 DEG C) of the thick-wall cast pipe blank is utilized, the pipe blank with residual heat is repeatedly and axially rolled, and the inner diameter and the outer diameter of the pipe blank are synchronously enlarged while the thickness of the pipe wall is reduced.

The present invention belongs to the technical field of functional sugars, and specifically relates to a resistant dextrin with high dietary fiber content and a preparation method thereof. The preparation method of the present invention comprises the following steps: mixing pea starch milk and liquefaction enzyme for liquefaction to obtain a liquefied liquid; the DE value of the liquefied liquid is 8-11%; the liquefied liquid is subjected to a molecular rearrangement reaction under acidic conditions to obtain a resistant dextrin; the dietary fiber mass content in the resistant dextrin is ≥93%. The present invention uses pea starch as a raw material, and after liquefaction, it is easy to obtain a crude dextrin liquid (liquefied liquid) with a suitable DE value. The present invention controls the DE value of the liquefied liquid to be 8-11%, and the obtained resistant dextrin has a high dietary fiber content and good digestibility.