48results about How to "Low content requirement" patented technology

The invention provides a microorganism improvement method for heavily salinized soil. The microorganism improvement method has the advantages that microorganism improvement and concealed-conduit salt elimination are combined according to the characteristics of the heavily salinized soil, namely high salinity, high alkalinity and non-suitability for crop growth, seedlings resistant to salt and alkali are planted, rice is planted after the seedlings are mature, and the salt is eliminated gradually, so that soil is improved, cost is reduced greatly, economic benefit is improved, and generally, after 5-7 years, the heavily salinized soil can be improved into fertile land.

The invention provides a preparation method of high-purity zinc oxide. The preparation method comprises the following steps: firstly, providing slurry of zinc-containing raw materials, wherein the raw materials comprise zinc and iron; the content of the zinc is limited to be not lower than 5 weight percent, and particle sizes of the raw materials are 100 to 150 meshes; neutrally leaching the slurry by adopting an acid solution, and carrying out solid-liquid separation to obtain a neutral leaching liquid; carrying out iron removal on the neutral leaching liquid and solid-liquid separation in sequence to obtain a treatment liquid, then carrying out zinc depositing reaction and calcining to obtain zinc-contained precipitation and obtaining the high-purity zinc oxide. According to the preparation method provided by the invention, the raw materials of which particle sizes are 100 to 150 meshes are provided; separation of the leaching liquid and filter residues is realized by mixing the acid solution; in the raw materials, the mass percentage of the zinc is not lower than 5 percent; by combining an iron removal step, sufficient removal of impurities in obtained precipitation is guaranteed, and the influence of iron on zinc precipitation in the zinc depositing process is further avoided; sufficient removal of the iron is realized by the steps, and the precipitation subjected to precalcined treatment is directly calcined to obtain the high-purity zinc oxide without crushing or ball milling.

The invention belongs to the field of environmental pollutant detection, and discloses a rapid analysis method of small-size microplastic in a water sample. The method comprises the steps of: a. firstly, performing primary screening on a collected water sample in a glass bottle; b. diluting filtrate obtained by the primary screening with high-purity water; c. digesting the remaining mixed solution(a portion of about 50ml is taken for the determination of conventional water quality parameters) with a hydrogen peroxide solution for more than 48h; d. performing vacuum filtering on the digested water sample by using a dual filter membrane system comprising glass fiber filter paper and a metal mesh filter membrane; e. drying the filtered metal mesh filter membrane for more than 24h; f. performing primary observation on the dried metal mesh filter membrane under an optical microscope; and g. performing observation, scanning, sample measurement, statistics and analysis on the metal mesh filter membrane by using a microscopic infrared system. The entire analysis method is easy to operate and short in time and provides a simple and effective new idea for the analysis of the small-size microplastic in the water sample.

The invention relates to a plate cavity-type heat exchanger which is provided with a plurality of heat exchange units clamped between two pressure plates (1); each heat exchange unit is respectively provided with two opposite wave plates (3) with wavy cross section; bifarius surfaces of the two wave plates are respectively opposite to water plates (2) on the corresponding sides; the water plates are provided with a plurality of horizontal water plate wave troughs (21) which are vertical to longitudinal wave plate wave troughs (31) on plane surfaces opposite to the wave plates, and a plurality of longitudinal pressure bearing strips (22); all the pressure bearing strips respectively correspond to the trough parts of the wave plate wave troughs; a cavity frame (4) is arranged between the two water plates; the front side and the rear side of the side frame of the cavity frame are respectively inlaid in the water plates (2, 6) on the corresponding sides, and respectively seal and press the periphery of the wave plate (3) on the corresponding side to the corresponding water plate through the side frame; and the invention can improve the pressure bearing capability of the heat exchanger and reduce the pressure bearing requirement on the heat exchange wave plates, the size of the working substance cavity can be designed on demand, and the problems that impurities block a runner and the like can be overcome by enlarging the cross section of the heat carrying runner.

The invention provides a severe saline-alkaline land microorganism improvement and elaeagnus angustifolia planting method. Aiming at the characteristics that severe saline-alkaline land is high in salinity and alkalinity and not suitable for crop survival, microorganism improvement and concealed conduit salt elimination are combined, saplings resistant to salt and alkali are planted firstly, salt elimination is carried out step by step, soil is improved, cost is greatly reduced, economic benefits are increased, the severe saline-alkaline land can be improved into fertile farmland usually within 4-7 years, and then other trees can be planted in a mixed mode.

The invention relates to the technical field of organic synthesis, and in particular relates to a method for synthesizing sec-butyl alcohol. The method comprises the following steps: firstly, performing addition reaction to synthesize sec-butyl propionate from an n-butene raw material and propionic acid, and secondly, performing hydrolysis reaction on sec-butyl propionate, thereby obtaining a target product sec-butyl alcohol. According to the method, under specific reaction conditions, with the combination of addition reaction and hydrolysis reaction, n-butyl alcohol is synthesized in a roundabout mode, the reaction condition is gentle, the reaction selectivity is high, the conversion rate is high, products are easy to separate and purify, the requirement on the content of n-butene in the n-butene raw material is low, and when the content of n-butene is 20wt%, the conversion rate of propionic acid can be up to 70.5%, and the selectivity is as high as 98.7%. By adopting the method, the yield of sec-butyl alcohol can be increased to be 47.1% from 10% of a catalytic hydration method, the yield is greatly increased, and thus the method can be used in industrialization production.

A cloth-bag duster for removing sulfur and fluorine compounds fume is composed of a dusting chamber, chemical powder container, compressed air source, and nozzle in said dusting chamber. Its dusting method includes spraying the chemical powder onto the surface of cloth bag, reaction between said chemical powder and water vapor in fume to obtain resultant, reaction between said resultant and the sulfur oxide and fluoride to become non-toxic chemicals, and discharging them along with the dust. It is suitable for cement production.

The invention discloses an integrated method for preparing a potassium fertilizer from Bayan Obo potassium-rich slate. According to the method, potassium is extracted from potassium slate by using X-ray selection, microwave pretreatment and microbial leaching, and then, the potassium fertilizer is subjected to integrated preparation, so that compared with traditional fertilizer production, the investment is small, the cost is low, the economic benefit is good, and no pollution is caused. Compared with untreated microbial leaching potassium fertilizer preparation, due to the combination of microwave pretreatment and microbial leaching, the potassium fertilizer preparation efficiency is higher, and the potassium fertilizer preparation cycle is shorter. According to the method, a steeling tailing pond and the potassium-rich slate of Bayan Obo regions can be reasonably utilized, and the waste is changed into the valuable, so that the method is beneficial to the development of cyclic economy of China.

The invention provides a method for preparing conjugated linoleic acid. The method comprises the following steps: reacting linoleate under catalysis of organic base of which the pKa is more than 11, thereby obtaining the conjugated linoleic acid ester. Furthermore, an ester exchange reaction can be carried out between the conjugated linoleic acid ester and glycerin or derivatives thereof, and conjugated linoleic acid glyceride is prepared. By utilizing the conjugated linoleic acid prepared by the invention, the reaction conversion rate is high, and the content of fatty acids in the conjugated linoleic acid product meets the related statutory and regulatory requirements.

The invention provides a preparation method of neohesperidin without heavy metals. The preparation method comprises the following steps: (1) impurity removal: crushing raw materials, removing impurities by using a cold aqueous solution containing basic salt and alcohol, filtering and collecting impurity-removed residues; (2) extraction; (3) flocculation: adding a flocculating agent into permeate,flocculating under an acidic condition, then performing solid-liquid separation, and collecting the permeate overnight; (4) chromatography: enabling the obtained permeate to pass through a cation exchange column, and collecting effluent; (5) coarse crystallization; (6) recrystallization: dissolving the obtained coarse crystals, and then recrystallizing; (7) nanofiltration; and (8) drying and crushing. According to the method provided by the invention, extraction separation, purification and heavy metal removal are performed by adopting the processes of removing impurities by using a low-temperature basic salt alcohol solution, flocculating by using acidic chitosan, removing impurities such as heavy metals by using ion exchange resin, performing coarse crystallization by using a low-temperature alkoxide solution, recrystallizing by using acetic acid and the like, so that a pure natural neohesperidin product with high purity and no heavy metals is obtained, the purity of the neohesperidin is 98 percent or above, and the yield is 90 percent or above.

The invention provides a preparation method of sec-butyl alcohol. The method includes the steps of: feeding a mixture obtained after the hydrolysis reaction into a sec-butyl alcohol azeotropic distillation tower for separation; withdrawing a mixed material containing sec-butyl alcohol, sec-butyl acetate and water from the side line of the upper part of the sec-butyl alcohol azeotropic distillationtower, feeding the mixed material into a multi-stage extraction tower, adding an extracting agent chilled water to obtain a sec-butyl alcohol-containing water phase at the bottom of the tower, and withdrawing the water phase at the bottom of the tower; feeding the mixture into a liquid separation tank to obtain a sec-butyl alcohol oil phase at the upper layer of the liquid separation tank; and feeding the sec-butyl alcohol oil phase obtained at the upper layer of the liquid separation tank into a sec-butyl alcohol refining tower for refining, and adding entrainer water to obtain the high-purity product sec-butyl alcohol at the bottom of the tower. According to the method, sec-butyl acetate and sec-butyl alcohol are effectively separated, the yield of the sec-butyl alcohol obtained after separation reaches 99.5% or above, and the one-way yield of the sec-butyl alcohol is greatly increased and is increased to 85% or above from 50%.

The invention provides a detecting probe. The detecting probe comprises at least one capturing probe; sequences from the 5' end to the 3' end of the capturing probe sequentially include a preamble sequence, a probe random label sequence and a target complementary sequence; the preamble sequence is shown as SEQ ID NO:1; the probe random label sequence is composed of 0-12 random basic groups; and the target complementary sequence comprises at least 10 continuous basic groups complementary with a to-be-detected gene. The detecting probe is used for detecting multi-target-point gene mutation, methylation modification and/or hydroxymethylation modification, low in content requirement for the to-be-detected gene, capable of effectively avoiding disturbance of length and content of the to-be-detected gene to detection, beneficial to detection of genes with high degradability and serious fragmentation, low in detection cost, high in efficiency and wide in application range.

The invention discloses a titanium-based amorphous alloy which has the components shown as the following general formula: TiaCubSncTLdTDe, wherein a expresses the atomic percentage of Ti, and 40<=a<=55; b expresses the atomic percentage of Cu, and 30<=b<=45; c expresses the atomic percentage of Sn, and 0<=c<=4; d expresses the atomic percentage of TL, 1<=d<=7, and TL is selected from one or more of VIIB group elements, VIIIB group metal except for Ni, Ag and Au in the periodic system of elements; e expresses the atomic percentage of TD, 0<e<=5, and TD is Y and/or Sc; and the sum of a, b, c, d and e is 100. The titanium-based massive amorphous alloy provided by the invention has wide preparation conditions and favorable combination property, is suitable for the machining requirements, and has important realistic significance in industrialized production.