38results about How to "Reduce mass transfer rate" patented technology

The invention described herein relates to a process for the catalytic epoxidation of olefins with hydrogen peroxide in a multiphase reaction mixture comprising an liquid aqueous hydrogen peroxide rich phase containing an organic solvent having a solubility in water of at least 10 % by weight at 25 DEG C and an liquid organic olefin rich phase.

The invention discloses a gypsum crystallization modifier suitable for wet type calcium-based desulphurization of a thermal power generating unit, and the gypsum crystallization modifier can effectively eliminate the impact of heavy metal ions and oil contaminations in gypsum slurry on gypsum crystallization process to obtain gypsum crystals with coarse and large particles and low water content, increases stability of the desulfurization system, and belongs to the technical field of environmental protection. The gypsum crystallization modifier comprises the following components by weight: 0.1-5% of an oil-removing agent, 85-95% of a metal complexing agent and 5-10% of a surfactant, and is characterized in that the gypsum crystallization modifier can be directly added into an absorption tower or an absorption tower filtrate pit, then mixed evenly and dissolved for pumping. The gypsum crystallization modifier can accelerate the oxidation of sulfites and the gypsum crystallization process, is appropriate to improve the efficiency of the desulfurization system. In the embodiment, the gypsum crystallization modifier concentration is increased from 0% to 0.1%, the by-product gypsum purity is improved from 78% to 93%, the gypsum water content is reduced from 19% to 10%, the crystal size distribution is more uniform, acicular gypsum crystals are decreased, rhombic crystal share and columnar crystal share increase, the crystal specific surface area increases, and the gypsum dewatering performance is better.

The present invention discloses a growth device and process of a silicon vapor epilayer and aims at providing a growth device and a process with homogeneous epilayer, convenient operation and high efficiency. The growth device includes a base body, a fixing slot on the base body, a step of 1-3mm wide on the edge of the fixing slot bottom, an annular groove of 1-3mm deep on the step and an arcual concave of 1-5mm deep below the step. The top of the annular groove is 1-3mm wide. The growth process includes the following steps: the silicon substrate wafer is positioned in the fixing slot with the upper surface of the substrate wafer 0.1-1mm lower than the upper surface of the base, and the epilayer grows. This invention has simple arts and crafts, provides homogeneous epilayer, controls the distribution area of the slip lines and removes the contaminative layer of metal impurities on the surface, improving the quality of the silicon epilayer and ensuring the performance of the product.

The invention discloses an extraction method of the nutrients in leaf lettuce, which belongs to the extraction of the organic nutrients of plants. The method comprises the steps that: edible leaf lettuce serve as a raw material, is dried, crushed and sieved; carbon dioxide supercritical extraction is carried out to the treated raw material by the set extraction temperature and extraction pressureintensity, and the raw material is separated in the carbon dioxide supercritical extraction at set separation temperature; after carbon dioxide supercritical extraction is started, the separated extract is collected at certain time interval, and the extract which is obtained by collection for twice to three times is the nutrients in the leaf lettuce. According to the method, because carbon dioxide supercritical extraction is adopted, the extraction temperature is low, and the bio-active substances which are extracted do not lose activity; and because no complicated extraction reagent is adopted, the extract is ensured to be purely natural and has no pollution.

The invention described herein relates to a process for the catalytic epoxidation of olefins with hydrogen peroxide in a multiphase reaction mixture comprising an liquid aqueous hydrogen peroxide rich phase containing an organic solvent having a solubility in water of at least 10 % by weight at 25 DEG C and an liquid organic olefin rich phase.

The invention discloses an extraction method of the nutrients in leaf lettuce, which belongs to the extraction of the organic nutrients of plants. The method comprises the steps that: edible leaf lettuce serve as a raw material, is dried, crushed and sieved; carbon dioxide supercritical extraction is carried out to the treated raw material by the set extraction temperature and extraction pressureintensity, and the raw material is separated in the carbon dioxide supercritical extraction at set separation temperature; after carbon dioxide supercritical extraction is started, the separated extract is collected at certain time interval, and the extract which is obtained by collection for twice to three times is the nutrients in the leaf lettuce. According to the method, because carbon dioxide supercritical extraction is adopted, the extraction temperature is low, and the bio-active substances which are extracted do not lose activity; and because no complicated extraction reagent is adopted, the extract is ensured to be purely natural and has no pollution.

The invention belongs to a method for synthesizing an epoxy compound by adopting a saponification method and specifically relates to a clean saponification method for generating the corresponding epoxy compound by performing dehydrochlorination reaction on powder alkali (quick lime / slaked lime or caustic soda) and chlorohydrin (mono-chloropropanol or dichloropropanol) under an ultrasonic effect. According to the invention, the powder alkali (quick lime / slaked lime or caustic soda) and chlorohydrin (mono-chloropropanol or dichloropropanol) have a dehydrochlorination reaction, so that the dosage of process water in the chlorohydrin saponification process is greatly reduced, the concentration of the generated saponification solution is greatly increased, the recycling of byproduct salt and the recycling of water can be realized under the condition of lower energy consumption, and thus the purposes of saving energy and reducing emission can be achieved.

The invention provides a method for preparing saponin by digestion at a vacuum degree of 0.05-0.07 MPa, and the method comprises the following steps of: adding water in gleditsia sinensis fruit particles or soapberry husks according to a certain solid to liquid ratio, heating a system, and performing vacuum extraction, wherein condensed water does not flow back to an extraction system again and is used as water for later extraction when the vacuum extraction time reaches a preset time, so that primary concentration of extracting solution is implemented. The primarily concentrated extracting solution is filtered and separated from solid residue, and further concentrated in vacuum until reaching a needed concentration. In the technical scheme, low extraction and concentration temperature reduces the digestion of soluble impurities (including soluble sugar, protein and the like), decomposition of saponin and Maillard reaction of sugar type impurities are avoided as well, and the yield, purity and appearance of the product are improved.

An erosion-resistant castable for a ladle and a use method thereof. The technical solution is: 45~65wt% corundum particles, 10~25wt% corundum fine powder, 10~20wt% aluminum magnesium spinel, 3~5wt% aluminate cement and 4~8wt% active Alumina micropowder is used as raw material, plus 0.1~0.3wt% of polycarboxylic acid dispersant and 0.1~5wt% of micron-sized magnetic particles, mixed, and then added with 4~5wt% of water, stirred, poured and molded , baked to obtain a castable green body. The mass ratio of micron-sized magnetic particles: tert-butanol is 1: (1-3), and the mixture is evenly stirred to obtain the magnetic particle coating. Then apply the magnetic particle paint on the surface of the castable green body, the coating thickness of the magnetic particle paint is 0.1~1mm, and then bake it at 80~110°C for 20~24 hours to obtain the corrosion resistant Castable. The product produced by the invention has the characteristics of being able to clean molten steel, having good slag resistance, corrosion resistance and long service life.

The invention discloses a device and a method for cooperatively removing gaseous pollutants by plasma-supergravity coupling. According to the device and the method disclosed by the invention, multiple gaseous pollutants are decomposed and oxidized by using high-energy electrons and active groups generated by low-temperature plasma discharge; in a process that the gaseous pollutants flow through a solid adsorbent reactor rotating at high speed, gas containing the pollutants are in sufficient contact with a solid adsorbent by means of a supergravity effect generated by high-speed rotation of gas and solid, to generate a gas phase-solid phase adsorption and chemical reaction to finish substance conversion and purification processes between multiple gaseous pollutants and the solid adsorbent, and thus the pollutants are converted into non-toxic and pollution-free substances. The device and the device are applicable to dry-process combined removal of multiple pollutants in flue gases and various wastes gas generated by combustion, gasification, incineration and the like in the fields of energy resources, chemical engineering, building materials, metallurgy and the like containing multiple gaseous pollutants.

The invention discloses a metal cleaning liquid, which is used for cleaning stains and corrosion layers on the surface of metal copper. 16-48 parts of sodium, 2-5 parts of tetrasodium iminodisuccinate, 0.3-1.2 parts of dopamine, 0.4-1.8 parts of agar, 110-195 parts of ethanol, and 785-950 parts of water. The present invention also discloses a cleaning method using the above-mentioned cleaning solution, the steps of which include: S1, preparation of cleaning solution; S2, chemical cleaning treatment; S3, freeze-drying; S4, high-pressure gas injection. The cleaning liquid and the cleaning method thereof of the present invention can realize effective cleaning of stains and corrosion products on the surface of metallic copper materials, and simultaneously effectively avoid the occurrence of secondary corrosion or secondary oxidation corrosion in the final drying process.

The invention provides a method for preparing an acid liquid system, which comprises the following steps: 1) after adding a thickener to the hydrochloric acid solution at a first stirring speed, stirring at a second stirring speed to obtain the first acid liquid ; 2) adding iron ion stabilizer, corrosion inhibitor and demulsification aid to the first acid solution successively, stirring evenly at the third stirring speed and standing still to obtain the base liquid; 3) adding to the Add a viscosifier into the base liquid, and stir at the fourth stirring speed to obtain the acid liquid system.

The present invention discloses a growth device and process of a silicon vapor epilayer and aims at providing a growth device and a process with homogeneous epilayer, convenient operation and high efficiency. The growth device includes a base body, a fixing slot on the base body, a step of 1-3mm wide on the edge of the fixing slot bottom, an annular groove of 1-3mm deep on the step and an arcual concave of 1-5mm deep below the step. The top of the annular groove is 1-3mm wide. The growth process includes the following steps: the silicon substrate wafer is positioned in the fixing slot with the upper surface of the substrate wafer 0.1-1mm lower than the upper surface of the base, and the epilayer grows. This invention has simple arts and crafts, provides homogeneous epilayer, controls the distribution area of the slip lines and removes the contaminative layer of metal impurities on the surface, improving the quality of the silicon epilayer and ensuring the performance of the product.