21results about How to "Low yield" patented technology

This invention discloses a method for synthesizing venlafaxine hydrochloride, comprising the following steps: reacting a Grignard reagent obtained from the reaction of bromocyclohexane with metallic magnesium with acrolein to obtain compound-1; reacting compound-1 with methanesulfonyl chloride to obtain compound-2; reacting compound-2 with triethylamine to obtain compound-3; reacting compound-3 with hydrogen peroxide and acetic anhydride in the presence of sodium hydroxide to obtain compound-4; oxidizing compound-4 with ozone and then reducing it with sodium borohydride to obtain compound-5; reacting compound-5 with methanesulfonyl chloride and then with dimethylamine to obtain compound-6; reacting a Grignard reagent obtained from the reaction of p-bromoanisole with metallic magnesium with compound-6 to obtain compound-7; and reacting compound-7 with hydrogen chloride to form a salt to obtain venlafaxine hydrochloride. The raw materials used in this invention are inexpensive and readily available, with a total molar yield of 67.98%, and the produced venlafaxine hydrochloride has a purity of over 99.5%. The product has high yield, low cost, and good quality, making it suitable for industrial production.

This invention belongs to the field of back-contact battery technology, specifically relating to a back-contact battery and its battery assembly with a specific front-side structure. This specific front-side structure includes a tunneling oxide layer and a specifically doped amorphous silicon layer sequentially disposed on the front side of a silicon substrate. Within the specifically doped amorphous silicon layer, a low-doped amorphous silicon layer, a high-doped amorphous silicon layer, and an oxygen-doped amorphous silicon layer are sequentially disposed along the direction away from the tunneling oxide layer. The specifically doped amorphous silicon layer is doped with phosphorus (P) and contains hydrogen (H). The P doping concentration C1 in the low-doped amorphous silicon layer and the P doping concentration C3 in the oxygen-doped amorphous silicon layer are both lower than the P doping concentration C2 in the high-doped amorphous silicon layer. This specific front-side structure enables the back-contact battery to achieve an absorption rate exceeding 85% for incident light within 400 nm. The back-contact battery of this invention maintains good performance even after long-term exposure to ultraviolet light, improving the battery's UV reliability while achieving high transmittance and high battery efficiency.

An isomerization catalyst characterized in that the catalyst comprises a composite carrier and platinum supported on the composite carrier, the composite carrier comprising 15.0-80.0 mass% of hydrogen type ZSM-22 zeolite, 10.0-70.0 mass% of hydrogen type ZSM-48 zeolite, 10.0-60.0 mass% of aluminum oxide based on the composite carrier. The catalyst is used for n-alkane isomerization reaction, has high activity and good stability, and can obtain higher isomer selectivity and yield, especially higher multi-branched alkane isomer selectivity and yield, and lower cracking product yield.

This invention discloses a catalyst for the production of ethylene and propylene, its preparation method, and its applications. The catalyst comprises the following components: I) 1%–10% of chemical formula A x B y D z A compound of O4; in the chemical formula, the oxidation states of elements A, B, and D are m, n, and p, respectively, satisfying x·m + y·n + z·p = 8, where m, n, and p are integers not greater than 3; the A x B y D z O4 has a spinel structure; II) 0.5%–10% is selected from at least one oxide of rare earth elements, P, Mo, and W; III) 20.0%–55.0% is selected from at least one zeolite of ZSM-5 and ZSM-11; IV) 10%–30% is a binder; V) 25.0%–60.0% is clay. This catalyst is used in the catalytic cracking of petroleum hydrocarbons to produce ethylene and propylene, and features good catalyst stability, low methane yield, and high ethylene and propylene yields.

The invention provides a method for preparing silanol by silane hydrolysis, which comprises the following steps of: reacting silane serving as a reaction raw material, water serving as an oxide and a metal compound serving as a catalyst to obtain silanol; wherein the molecular formula of the silane is SiHR1R2R3, and R1, R2 and R3 are independently selected from C1-C4 alkyl, phenyl, alkyl-substituted phenyl, halogen-substituted phenyl and alkoxy-substituted phenyl; the metal compound is carbonate of sodium, potassium or cesium. According to the method for preparing silanol through silane hydrolysis, hydrogen is a unique by-product and cannot pollute the environment, and the requirement for green catalysis is met. In addition, the metal compound catalyst is low in cost, the target product silanol can be separated by extracting a reaction mixture, the product yield is high, operation is simple, and implementation is easy. In addition, the method is mild in reaction condition and easy for industrial application.

The application belongs to the field of petroleum refining catalysis technology, and discloses a ZSM-5 additive for increasing propylene production and a preparation and use method thereof. In the method, waste filtrate prepared by using SAPO-34 molecular sieve is used to improve the stability of the molecular sieve under a high-temperature water-containing atmosphere, prevent the molecular sieve channels from being blocked by excessive phosphorus elements, reduce environmental pollution caused by the waste filtrate, improve the specific surface area of the ZSM-5 additive and the stability of the product, realize the dual effects of the stabilization of the molecular sieve by the phosphorus elements and the protection of the organic ammonium channels, complement the low-molecular-weight ammonium polyacrylate, white carbon black and phosphorus aluminum binder, construct a hierarchical pore structure (micropore-mesopore-macropore hierarchical pore), and then obtain the additive with a specific surface area of 150-170 m 2 / g, an addition amount of only 10 wt% can achieve a propylene production effect better than that of 20 wt% of a commercially available additive, the catalyst procurement cost of a refinery is greatly reduced, and the slurry oil yield is reduced and the heavy oil cracking capacity is improved.

The utility model discloses a kind of dismounting type waterway structures, with body, body has a first seat body, a second seat body and two communicating pipe body and several water outlet pipe body, the front end and the rear end of pipe body are all with the inside wall of the shell of shower main body can be matched with the top tight structure, in two top tight structures, one top tight structure or two top tight structures are equipped with adjusting structure on pipe body, adjusting the spacing between two top tight structures;First seat body has water mixing valve installation chamber, adjusting water outlet passage, two water passage and water inlet passage in it;Second seat body has water distribution valve installation chamber, adjusting water inlet passage, several water outlet passages and water inlet passage in it.Compared with prior art, it is made by adopting split processing, easy to process, high yield, lighter in quality, low replacement cost, and disassembly and assembly are convenient, easy to maintain.

The invention discloses a transaminase mutant with improved enzymatic activity and application of the transaminase mutant, and the transaminase mutant is formed by mutation of one or more sites by taking transaminase with an amino acid sequence as shown in SEQ ID NO.2 as a parent. Compared with parent transaminase, the oseltamivir phosphate has higher catalytic activity, the production efficiency can be improved, the production cost is reduced, and the oseltamivir phosphate has a good application prospect in industrial production of oseltamivir phosphate.

The utility model provides a high heat transfer rate glass-lined kettle for bromopropane production, which relates to the technical field of glass-lined kettles, and comprises a glass-lined kettle shell, a support hanging ring is fixed on the peripheral surface of the glass-lined kettle shell, and a peripheral pentagonal piece is fixed on the peripheral surface of the glass-lined kettle shell. The glass-lined kettle is generally required to be placed in a factory area and is usually placed in a side-down manner, however, the existing glass-lined kettle design is lack of a special support component for the side-down state, and some simple methods and hard objects such as stones are required to be adopted by some manufacturers to temporarily fix the glass-lined kettle to clamp the kettle body, so that the glass-lined kettle cannot be fixed by the manufacturers. Even some glass lining kettles are temporarily fixed and buffered through tires, certain risks exist in the methods, the surfaces of the kettles are prone to being damaged, and therefore the yield is reduced, the appearance quality of the glass lining kettles is affected, potential damage is caused to the internal structure and performance of the glass lining kettles, and the corrosion resistance and attractiveness of equipment are reduced.

The application discloses an open type spaceborne SAR array surface power supply and an assembling method thereof, and the array surface power supply comprises a cover plate, a frame and a bottom plate; the cover plate, the bottom plate and the frame are connected through fasteners; a small supporting plate and a large supporting plate are integrally arranged in the frame; a power transformer and a power inductor are assembled on the front surface of the small supporting plate and the large supporting plate; a printed board is further assembled in the frame, and the printed board is located in the same plane as the small supporting plate and the large supporting plate; all components except the power transformer and the power inductor are arranged on the printed board. In the application, the main components in the single machine are arranged on the board and are double-sidedly distributed, the volume and weight of the single machine are reduced to half of the traditional design under the premise of solving the space environment heat dissipation problem; the open type structure design is adopted, the surface-mounted test pads are introduced on the back of the printed board, and great convenience is brought to the batch production and debugging of the product.

The invention discloses a crystal form A of acetyl L-carnitine hydrochloride, a preparation method of the crystal form A, and a bulk drug, a food additive, a feed additive and a composition containing the crystal form A. The crystal form A of the acetyl L-carnitine hydrochloride is good in solubility, high in stability, high in purity, regular in shape and suitable for being applied to bulk drugs, food additives and feed additives. The preparation method is simple in process, the crystal form A can be obtained at high yield through in-situ crystallization of a reaction solution and dispersion of ethanol, and the preparation method is suitable for large-scale industrial production.

The utility model provides a flexible LED decorative lamp based on a flexible silica gel substrate, which relates to the technical field of LED lamps, and comprises a decorative lamp strip and a winding column, end hollow rings are fixed at the top and the bottom of the winding column, and the inner wall of each end hollow ring is rotatably connected with a base rotating seat. The mode of installing the L-shaped pressing piece is adopted for solving the problems that an existing bendable LED decorative lamp is usually transported and stored in a curled mode in design, due to the fact that the thickness of a lamp strip is large, when a traditional adhesive tape is used for trying to fix, firm bonding is often difficult to achieve due to insufficient viscosity; if a ribbon is adopted for binding, the lamp strip is easily damaged due to the fact that the contact area between the ribbon and the lamp strip is small, in addition, the curled lamp strip is fixed through the ribbon, operation is quite difficult, the phenomenon of slipping easily occurs in the using process, the lamp strip needs to be cut according to specific requirements, and the cost is low. Therefore, the remaining lamp strip is difficult to effectively fix and easy to scatter, the user experience is reduced, and the working efficiency is also influenced.

The utility model discloses a carrot harvesting storage basket device, including frame, control platform, walking mechanism, harvesting mechanism and change basket system, the walking mechanism is equipped with in frame bottom, the symmetrical harvesting mechanism is equipped with in frame front end, the change basket system is equipped with in frame rear end, and the control platform is equipped on the frame, the utility model, modular design realizes efficient cooperation, the depth is adjusted to loose soil plowshare through electric push rod mechanism, and the clamping band is driven by direct current motor and is linked with laser sensor, and the double-leaf steel cutter high -speed rotation is driven by cutting cherry motor, and ultrasonic sensor and electric push rod constitute automatic change basket system, and four -wheel -drive motor and controller ensure operation stability, the utility model discloses the operation efficiency promotion, the damage rate is reduced with the leakage rate, and the equipment cost is far lower than imported equipment, and the adaptation small peasant household demand, energy consumption reduces, and the automatic function reduces manual intervention, in addition, loose soil plowshare reduces soil compaction, and flexible clamping protects crop quality, and stem and leaf recycling utilization improves resource utilization rate.

The invention relates to the technical field of aromatic amine preparation, and discloses a preparation method of naphthalene diamine, which comprises the following steps: in the presence of a catalyst and an auxiliary agent, enabling naphthalene diphenol to react with an ammoniation reagent to prepare the naphthalene diamine, the auxiliary agent comprises hydrophosphite and / or hydrophosphate. It needs to be explained that direct ammoniation of the naphthalene diphenol is not easy, so that hydrogen ions are introduced with the hydrogen phosphite and / or the hydrogen phosphate as an auxiliary, the hydrogen ion concentration is increased, after the hydrogen ions are combined with the naphthalene ring or hydroxyl of the naphthalene diphenol, the naphthalene ring electron density is reduced, the ammoniation step can be more easily carried out, and then the reaction time is shortened. If the concentration of hydrogen ions in the added auxiliary agent is too high, the hydrogen ions preferentially react with the ammoniation reagent to form ammonium ions, so that free ammonia molecules are reduced, the reaction time is prolonged, and the yield of the naphthylenediamine is reduced.

The present application relates to a kind of multi-effect herbaceous plant composite soothing repair composition and its preparation method, belong to the cosmetic technical field.The present application is by mixing glacial low deuterium water and superoxide dismutase to obtain A component, add D component (specific proportion nicotinamide mononucleotide (NMN) and modified hyaluronic acid microsphere) by the special interaction of the two with low deuterium water, form "triple synergistic carrier system", significantly improve the penetration and stability of active substance;B component is to mix hydroxyl asiaticoside and humectant.Meanwhile, the composite extract prepared by mixing the extract of radix stephaniae tetrandrae, the extract of gentiana and the extract of piper methysticum is C component, after mixing with A, B, D each component, low deuterium water can well carry the active ingredient in plant extract, hydroxyl asiaticoside and humectant in B component are mixed, can give full play to the moisturizing effect.The composition obtained after mixing A, B, C, D component has excellent soothing repair effect.

The invention relates to a synthetic method of substituted 2-nitrobiphenyl, and belongs to the technical field of organic synthesis.The method comprises the steps that under nitrogen protection, magnesium chips and substituted bromobenzene serve as raw materials to prepare a Grignard reagent; then, in the presence of a catalyst, carrying out coupling reaction on the Grignard reagent and o-nitrobenzene sulfonate; after the reaction is finished, post-treatment is performed to obtain substituted 2-nitrobiphenyl, and the substituted bromobenzene is parachlorobromobenzene or 3, 4, 5-trifluorobromobenzene. According to the method, substituted bromobenzene and o-nitrobenzene sulfonate are directly used as raw materials, the problems of multi-step operation and low yield of phenylboronic acid preparation in a traditional route are solved, meanwhile, precious metal is replaced with the cheap copper catalyst, the raw material cost and environmental protection pressure are remarkably reduced, and the method is short in reaction route, easy to operate, high in yield and suitable for industrial production. The method is suitable for industrial large-scale production.

This utility model relates to the technical field of UV transfer printing devices and discloses a UV transfer printing device suitable for processing patterns on the surface of acrylic bathtubs, including a bracket. This UV transfer printing device for processing patterns on the surface of acrylic bathtubs, through the setting of a clamping mechanism, first moves the outer bathtub upwards from the slope next to the base into the inside of the slot. Then, the clamping hydraulic rods on both sides inside the slot are adjusted and fixed to the bottom sides of the outer bathtub by the control of the PLC controller. Next, the upper clamping assembly inside the bracket allows the arc-shaped clamping plate to clamp and fix the outer bathtub to the other two sides of the upper end, thus clamping and fixing the outer bathtub for subsequent work. This avoids the lack of a clamping and fixing link, which can easily lead to positional shifts or shaking, resulting in local suspension or misalignment of force points, easily causing pattern alignment deviations, uneven adhesion of the transfer film, and air bubbles, affecting the transfer quality and even reducing the product yield.

The application provides a SAA recombinant protein and a preparation method and application thereof, and the preparation method comprises the following steps: S10, constructing a recombinant plasmid: a gene sequence of an amino acid sequence shown in SEQ ID NO: 1 or a nucleotide sequence corresponding to an amino acid sequence shown in SEQ ID NO: 2 is inserted into a pET-28a(+) plasmid which is double-digested by NdeI and XhoI after being double-digested by NdeI and XhoI, so that a recombinant plasmid is obtained; S20, transforming and culturing the recombinant plasmid; S30, protein expression and purification. The application solves the technical problem that the stability of the currently recombinantly expressed SAA protein in vitro is poor, and achieves the technical effect of improving the stability of the SAA recombinant protein in vitro.

This invention relates to a catalyst containing divalent iron, its preparation method and application, and a method for producing nitrile compounds by the ammoxidation reaction of low-carbon olefins. The catalyst comprises a support and an active component containing the following general formula: Mo 11.0 Bi b Fe c D d E e F f O x In the formula, D is selected from at least one of Li, Na, K, Rb, and Cs; E is selected from at least one of rare earth elements La, Pr, Nd, Sm, and Eu; F is selected from at least one of Ca, Mg, Zr, Te, Sb, Ni, Cr, W, and Nb; wherein b ranges from 0.1 to 5.0; c ranges from 0.1 to 5.0; d ranges from 0.1 to 5.0; e ranges from 0.1 to 5.0; f ranges from 0.1 to 15.0; x is the total number of oxygen atoms required to satisfy the valence of each element in the catalyst; the catalyst crystal structure contains a divalent iron phase. The catalyst of this invention is applied to the ammoxidation of propylene to acrylonitrile, and has the characteristics of high propylene conversion rate and acrylonitrile selectivity.

This invention provides a component mounting system and a component mounting method capable of suppressing a decrease in yield. The component mounting system (1) includes a control unit (340) that determines whether an input unit (330) has received input during a period of non-receipt, which is the period before the number of processed blocks on which the mounting device (100) mounts the component (440) on the substrate (400) reaches a given number. If it is determined that the input unit has received input, the mounting device corrects the mounting position based on a first correction amount calculated by a calculation unit (320) based on the deviation amount measured by an inspection device (200) from each of the processed blocks of substrates. If it is determined that the input unit has not received input, the mounting device mounts the component on the given number of substrates, and corrects the mounting position based on a second correction amount calculated by the calculation unit based on the deviation amount measured by the inspection device from each of the given number of substrates.

The application provides a preparation method of hexanediol bis[3-3,5-di-tert-butyl-4-hydroxyphenyl]propionate, comprising the following steps: step one, adding 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propyl methyl ester, 1,6-hexanediol and immobilized lipase Novozym435 into a reaction kettle, filling CO2, and performing enzyme catalysis transesterification reaction in a supercritical CO2 state; step two, filtering the reaction liquid in step one, recycling and repeatedly using the filter cake which is the catalyst immobilized lipase Novozym435, and performing column chromatography treatment on the filtrate; step three, according to the separation conditions of each component in the reaction liquid sample in step one in thin layer chromatography or liquid chromatography, combining the target collection liquid in the column chromatography process and removing the solvent again; combining and removing the solvent of other collection liquids, and repeatedly participating in the reaction of the remaining substances; and step four, drying the remaining substances of the target collection liquid in step three to obtain a target product.