70 results about "Acid digestion" patented technology

The invention belongs to the technical field of aluminum oxide extraction, and in particular discloses a process for producing aluminum oxide by using a hydrochloric acid method. The process comprises the following steps: crushing and grinding aluminum-containing mineral, mixing with hydrochloric acid, feeding into an acid digestion system, dissolving in acid, subsequently separating acid residues to obtain acid residues and a crude aluminum chloride liquid, washing the acid residues, feeding into a storage yard for stockpiling, performing refined filtration on the crude aluminum chloride liquid to obtain a refined aluminum chloride liquid, performing evaporation and concentration on the refined aluminum chloride liquid, and feeding into an aluminum chloride acidification system; separating and washing aluminum chloride crystals obtained after acidification, and feeding into an aluminum chloride calcining system; and calcining aluminum chloride crystals to obtain an aluminum oxide product. The process is particularly applicable to processes for producing aluminum oxide from non-bauxite resource such as coal ash, high silica bauxite, nepheline, clay and kaolin by using an acid method, and the prepared aluminum oxide can meet or be superior to national standard class or one-class aluminum oxide products, and can completely meet the requirements of electrolytic aluminum.

The invention discloses a method for analyzing arsenic content in a glass refining agent, which comprises the following steps: processing samples by a potassium permanganate preoxidation-hydrofluoric acid wet digestion method to obtain a sample digestion solution; measuring the content of arsenic in the digestion solution by an inductance coupling plasma atomic emission spectrometry. By using potassium permanganate as a pre-oxidizing agent to carry out routine wet acid digestion on glass refining agent samples, the method can effectively avoid volatilizable loss of low-valent arsenic components in the preliminary processing of the samples, therefore, a routine inductance coupling plasma atomic emission spectrometer can be used to directly measure the content of the effective content-arsenic in the glass refining agent without allocating a hydride generator or an atomic fluorescence spectrometer. The method has the advantages of high operability, high analysis speed, high accuracy and favorable sensitivity and repetitiveness.

The invention discloses a multi-efficacy composite enzyme preparation for feed. The multi-efficacy composite enzyme preparation comprises the following enzymes in percentage by weight: 30 to 40 percent of xylanase, 10 to 20 percent of beta-glucanase, 15 to 20 percent of mannose and 30 to 40 percent of glucose oxidase. Compared with the prior art, the product of the multi-effect composite enzyme preparation has the following advantage that the influence on the animal production performance is improved by adopting a mode of improving the nutrient digestive utilization and relieving anti-nutrition factors. In addition, the glucose oxidase consumes O2 in the process of acting with glucose, anaerobic environment can be more easily formed in a digestive tract, meanwhile, gluconic acid is generated for promoting the propagation of anaerobic bacteria, and the effects of acidulants and probiotics are realized. The intestinal tract acid digestion environment is sufficiently improved, the growth and the propagation of the germs in the intestinal tract are controlled, the completeness of the intestinal tract epidermal cells is protected, and the intestinal tract flora ecological balance is regulated.

The invention relates to a method for measuring the content of a heavy metal in a polymer, and in particular relates to a method for synchronously testing the contents of lead, cadmium, mercury, arsenic, antimony, tin, copper and zinc in the polymer by processing the polymer using oxygen bomb combustion, concentrating absorption liquid, carrying out acid digestion and subsequently using a plasma atomic emission spectrometry (ICP-AES) method. The method for measuring the content of the heavy metal in a polymer material comprises the following steps of: firstly, combusting oxygen bomb, secondly, carrying out acid digestion, and thirdly, testing by using an inductive coupling plasma atomic emission spectrometry instrument. The polymer is sufficiently combusted under a rich oxygen condition by using an oxygen combustion method, the combustion product is absorbed by water, and the absorption liquid is concentrated and subjected to acid digestion; and with the adoption of the method, the treatment to the polymer is efficient, simple, convenient and rapid.

A system for recovering rare earth elements from coal ash includes a leaching reactor, an ash dryer downstream of the leaching reactor, and a roaster downstream of the ash dryer that is cooperatively connected to both the leaching reactor and the ash dryer. Coal ash is mixed with an acid stream such that rare earth elements present in the coal ash are dissolved in the acid stream, thereby creating (i) a leachate containing the rare earth elements and (ii) leached ash. The leachate is heated to obtain acid vapor and an acid-soluble rare earth concentrate. Mixing of the coal ash with the acid stream can occur in a leaching reactor and heating of the leachate can occur in a roaster. The acid-soluble rare earth concentrate can be fed to a hydrometallurgical process to separate and purify the rare earth elements.

The invention discloses a forensic medical diatom inspection method based on mixed acid digestion. The forensic medical diatom inspection method comprises the steps of optical microscope inspection and scanning electron microscope inspection. The optical microscope inspection at least comprises the steps of: (1) performing a blank test; (2) performing mixed acid digestion by adding concentrated nitric acid, concentrated hydrochloric acid and a hydrogen peroxide solution in a sample to be tested and digesting in a manner of heating in water bath; (3) centrifuging and precipitating; (4) coating on a sheet and sealing by using epoxy resin; and (5) performing diatom qualitative and quantitative analysis. The scanning electron microscope inspection at least comprises the steps of: (1) performing a blank test; (2) performing mixed acid digestion by adding concentrated nitric acid, concentrated hydrochloric acid and a hydrogen peroxide solution in a sample to be tested and digesting in a manner of heating in water bath; (3) performing vacuum filtration; (4) automatically taking pictures and storing images by a scanning electron microscope; and (5) performing diatom qualitative and quantitative analysis. The forensic medical diatom inspection method based on the mixed acid digestion, disclosed by the invention, is high in sensitivity, efficient, safe, environment-friendly and exact in qualitative and quantitative analysis, and has good application prospect in the forensic medical drowning diagnosis practice.

The invention discloses a serum iodine quantitative determination kit. Serum samples are digested through an acid digestion method, and the iodine content is calculated by means of catalysis of iodine to an arsenic-cerium oxidation-reduction reaction, determination on changes of the Ce<4+> absorbance value in a reaction system and the condition that the iodine concentration and the logarithm of the absorbance value have a linear relation. Building of the kit mainly comprises work of three aspects of digestion condition selection, reaction system determination and method validation, and the detects that an existing method is complicated in reagent preparation, pollutes the environment and harms health of a detected person, and instruments are expensive are overcome. The method is mainly used for detecting the content of iodine in serum of human bodies and animals, detection can be carried out in provincial level, prefecture level and county and district level disease prevention and control departments in China and medical institutions at various levels conveniently, and requirements of individual iodine nutrition evaluation for disease control and in clinical practice can be met.

The present invention describes a process for the production of alcohols and/or solvents from a cellulosic or lignocellulosic substrate, comprising at least the following steps:

• • a step A for alkaline pre-treatment of said substrate, comprising a step for heating in the presence of an alkaline chemical reagent and an optional washing step;
  • a step B constituted by a step for adjusting the pH and a step for enzymatic hydrolysis of the pre-treated substrate, at the end of which a hydrolysate is obtained constituted by a liquid phase containing sugars and a solid residue;
  • a step for alcoholic fermentation of the hydrolysate obtained;
  • a step for separation/purification (step C2) at the end of which one or more purified alcohols and/or solvents are obtained;
  • a step for extracting the solid residue;
  • a step D for acid digestion of at least a fraction of the extracted solid residue, at the end of which a portion or all of the product obtained is recycled to step B.

The invention discloses gelatin and a method for measurement of hexavalent chromium in a product thereof. The method comprises the following steps of: adding MgC12, a phosphate buffer liquid and Na2CO3/NaOH solution into a sample; placing in a water bath with 75 to 85 DEG C, and performing oscillation digestion for 0.5 to 1.5 hours; cooling to room temperature, and leaching by using a filter membrane of 0.45 micrometer; placing a filter liquid on an electric heating plate for acid digestion; and diluting a digestion liquid, metering constant volume, and measuring the content of the hexavalent chromium by an atomic absorption spectrometry method. Substrate interference is removed by adopting acid digestion, the method has high specificity and sensitivity, and a result is accurate.

The invention discloses a method for industrially producing silicate phosphate from rice husk carbon, which comprises the following steps of: smoldering and carbonizing rice husks to obtain rice husk carbon; performing acid digestion or acid firing on the rice husk carbon to obtain initial activated carbon; and performing dustproof and explosion-proof sealed packaging treatment on the initial activated carbon, and performing intermediate temperature, sub-high temperature and high temperature activation to finally prepare high-quality silicate phosphate and activated carbon. The method overcomes the defect of low yield of silicate phosphate prepared from the rice husk carbon in the prior art. The process method has the advantages of simpleness, reasonableness, convenient operation and high separation rate of carbon and silicon elements from the rice husk carbon, overcomes the technical barrier of intermediate and high temperature activation of the rice husk carbon, can directly produce the high-quality silicate phosphate and activated carbon from the rice husk carbon, effectively improves the economical and social benefits of the rice husks, can realize the concept of conservation, low carbon and economy, and provides a new way for agricultural industrialization.

The invention provides a method used for producing hydrogen by taking cellulose as a raw material. The method comprises following steps: 1, microwave acid digestion; 2, enzyme hydrolysis; 3, dark fermentation hydrogen production; 4, photo fermentation hydrogen production; and 5, purification. The method is high in hydrogen yield, hydrogen production efficiency, substrate utilization ratio, and energy conversion efficiency.

The invention relates to a preparation method of a polynuclear metal phthalocyanine alkane oxidation catalyst. The preparation method comprises steps of: using phthalic anhydride or substituted phthalic anhydride, urea, pyromellitic dianhydride and metal sources in a certain molar ratio as raw materials; reacting in a high boiling point solvent; and then conducting acid digestion, alkali cooking, washing, suction filtration, Soxhlet extraction and drying to obtain the polynuclear metal phthalocyanine. Compared with the disclosed preparation method of polynuclear metal phthalocyanine, the method provided by the invention has simple process, yield of finished catalyst product higher than 60%, little volatile solvent and solid waste emission. The catalyst has a raw material conversion rate no less than 10%, if applied to the catalytic oxidation process of butane and hexane, and has a broad application prospect in the field of catalysis of alkane oxidation.

The invention discloses a method of determining selenium shape of honey and fruit juice by solid phase extraction-atomic fluorescence spectrometry. The method comprises the following steps: separating organic selenium and inorganic selenium in honey or fruit juice under a condition of pH being 3 by means of an SCX solid phase extraction column; then adding a mixed acid to digest and separate to obtain an inorganic selenium extraction liquid; then determining the selenium element by means of atomic fluorescence spectrometry; determining the content of total selenium by means of wet digestion; and finally obtaining the content of the organic selenium by means of a minusing method. The method of determining the shape of selenium separates and determines inorganic selenium and organic selenium accurately and effectively by combining technologies of ionic adsorption exchange, acid digestion and atomic fluorescence spectrometry and the like. The method is simple, environmentally friendly and efficient, thereby providing a powerful technical support for evaluating the functionality and safety of selenium-enriched honey and juice.

The present invention discloses a preparation method for a ferromolybdenum sample melting glass body. The preparation method comprises the following process steps: preparation of a sample, acid digestion of the sample, preparation of a melting glass body sample, and preparation of a glass body in a shaped crucible by the melting glass body sample. According to the method of the present invention, nitric acid is adopted to digest the ferromolybdenum sample; a treatment of low temperature drying is performed; regents of lithium tetraborate and ammonium iodide are added, the melting glass body is prepared at the high temperature of 1100 DEG C by high temperature melting. According to the present invention, a new melting sample preparing approach is provided for the ferromolybdenum synthesis by the X-ray spectrometry; the difficulties in the ferromolybdenum melting glass body preparation in the prior art are solved; the method of the present invention has characteristics of convenient operation, rapidness, easy control; with the method, the platinum crucible is not damaged, the service life and the use period of the platinum crucible are prolonged, the cost for repeatedly repairing the crucible is saved; the formed ferromolybdenum melting glass body is bright and transparent, meets the requirements of the detection by the XRF method, and has a strong application prospect.

The invention belongs to the field of test of lithium battery electrode impurities and particularly relates to a comprehensive test method of content of impurities in a lithium ion battery nano conductive agent. The method comprises the following steps: (1) burning at high temperature to remove graphite; (2) testing and analyzing elements components of impurities in residue via an SEM-EDS energy spectrum; (3) carrying out specific acid digestion treatment by using different type of acid solutions according to the elements components of the impurities tested by the SEM-EDS energy spectrum; (4) filtering a digestion solution after carrying out acid digestion in the step (3) and titrating constant by using ultrapure water to carry out ICP test; (5) carrying out the steps (1)-(2) repeatedly if residue still exists after carrying out acid digestion in the step (4) so as to carry out semi-quantitative SEM-EDS energy spectrum analysis test on the residue subjected to acid digestion; (6) calculating the total content of the impurities, namely determining the total content of the impurities as the content of ICP if no residue exists in the step (4), and determining the total content of the impurities as the sum of the content of ICP and the content tested by the SEM-EDS if the residue exists in the step (4).

The invention provides a teduglutide tandem polypeptide, which contains two or more teduglutide polypeptides connected by joint peptide, and the joint includes acid digestion and enzyme digestion site. The invention also provides a plasmid and host cell containing the teduglutide tandem polypeptide sequence, and a method for preparation of teduglutide from the teduglutide tandem polypeptide.

The invention discloses a mineral processing and deep purification method for quartz sand. The method comprises the following steps of (a) during the scrubbing of the quartz sand in an acid-digestion scrubbing machine, adding a sulfuric acid solution with the weight concentration of 15-60% for acid digestion, wherein the weight ratio of the quartz sand to the sulfuric acid solution is 25-65%, the temperature for acid digestion is 50-135 DEG C, the time for acid digestion is 20-90 minutes, and sulfuric acid can quickly react with iron-bearing minerals in the quartz sand through the organic combination of the mechanical scrubbing and acid digestion of the quartz sand; and (b) after acid digestion, separating the quartz sand from filtrate through filtrating, wherein the filtrate can be recycled, and products with Fe2O3 content meeting requirements are obtained after the quartz sand is cleaned. The method has the beneficial effects that aims which can not be achieved by the conventional mineral processing methods are realized, the dependence on high-quality siliceous resources is lowered, and the utility value of the quartz sand products is increased; and the method can also be applied to the field of the mineral processing and purification of non-metallic minerals, such as quartz fine (tail) sand, feldspar and the like.

The invention relates to an extraction method of prolease in swine stomach, comprising the following steps: selecting the stomach of an adult swine; picking off the mucosa at the bottom part of the fundus of the swine stomach with thickness of about 2-3 mm and mincing; adding hydrochloricacidextract of 1:2-4 times with the pH value of 2.5 into the minced mucosa; adding tween-80 with the concentration of 5 mg/mL-15 mg/mL; placing the above mixed liquor into an ultrasonic wave medicine processor for treatment in the icebath by utilizing ultrasonic wave, wherein, the power of the ultrasonic wave is 220+/-20 W-320+/-20 W, the frequency of the ultrasonic wave is 23 kHz-43 kHz, and the treatment time of the ultrasonic wave is 90s-150s; then transferring into the water bath with the temperature of 45 DEG C for digestion for 58 min; centrifugating and extracting supernate to obtain the protease. The highest specific activity of the protease in the swine stomach extracted by the ultrasonic-assistant acid method reaches 5.82 U/mg, while the specific activity by traditional acid digestion is only 3.5 U/mg, and the digestion time is reduced by around 1.5h.

The invention discloses a technology for observing a plant chromosome in a tabletting method. The method comprises the steps of preprocessing a testing material subjected to active cell division, fixing the chromosome, carrying out acid digestion on cells, neutralizing with alkali, dyeing, and observing tablets. 1cm to 2cm of a part, subjected to the active cell division, of the test material is preprocessed in a processing solution under a dark condition, after a preprocessed sample is well fixed by a fixed solution, the walls of the cells are subjected to acid digestion by high-concentration hydrochloric acid, the surplus hydrochloric acid is neutralized by weak protoplast base, then the dyeing and tabletting are carried out, and finally the division situation of the chromosome is observed under a microscope.

The invention discloses a kangaroo bone extract and an extraction method thereof, wherein the extraction method comprises: taking kangaroo bone, cleaning, grinding, carrying out acid digestion to demineralize, adopting a protein extraction solution to further carry out multiple digestions, adopting organic solvent leaching to remove impurities, and drying to obtain kangaroo bone extract protein particles. With the extraction method, per g of the protein particles contains 9.5-10.7 mg of protein, 4.8-6.13 mg of osteocalcin, and 4.35*10<-3> ng of bone morphogenetic protein; and mixtures of more than 500 proteins can be extracted from the kangaroo bone, wherein the proteins comprise osteocalcin, osteonectin, bone morphogenetic protein, alkaline phosphatase, insulin-like growth factor and the like, wherein more than 30 proteins are related to bone metabolism, provide ideal promotion effects for induction of differentiation of mesenchymal stem cells into bone cells and cartilage cells, and can be used for preventing and treating bone joint diseases such as osteoporosis and the like. In addition, the kangaroo bone extract protein particles obtained by using the extraction method contain a lot of proteins and related effective components, an extraction effect is good, the kangaroo bone extract protein particles can be used as base raw materials of health products and drugs for prevention and treatment of bone joint diseases, and qualities and effects of kangaroo products are increased.

The present invention relates to a water-soluble cobalt phthalocyanine and a synthesis method. The technical scheme is as follows: the tetra-substituted imidazolium cation-containing water-soluble metal cobalt phthalocyanine is synthesized by cyclization by direct use of an imidazolium cation-containing phthalonitrile derivative as a precursor, by introduction of the imidazolium cation, the water-solubility of the cobalt phthalocyanine can be significantly increased, the manufacturing process needs no addition of an acid, acid digestion method is not needed in the purification process, equipment corrosion is avoided, and environmental pollution is reduced. The high-purity water-soluble cobalt phthalocyanine can be obtained by washing with a solvent.

The invention relates to a method for preparing rhodium trichloride hydrate by using silica gel-polyamine resin. The method comprises the following steps: adding water to dilute a rhodium acid digestion solution obtained after digestion of rhodium residues by concentrated sulfuric acid and nitric acid, adding a sodium chloride solid, and heating to reflux the obtained solution; allowing the solution to go through an exchange column filled with silica gel-polyamine resin; and sequentially eluting a small amount of sodium, iron, calcium, nickel and other metals residual in the column and adsorbed to the resin by using deionized water and 1-6mol/L of a hydrochloric acid solution, eluting rhodium adsorbed to the resin by using 6-12mol/L of 50-90DEG C hydrochloric acid, and evaporating the eluted chlororhodic acid solution to obtain the rhodium trichloride hydrate. In the rhodium acid digestion solution, the rhodium content is 1-10wt%, the nitrate content is 1-5wt%, and the sulfuric acid content is 30-85wt%; a molar ratio of sodium chloride to rhodium in the digestion solution is 3-15; and the silica gel-polyamine resin is water soluble polyurethane, and is combined to resin formed on the surface of a silica gel carrier in a covalent bond mode. The method for preparing rhodium trichloride hydrate from the rhodium acid digestion solution has the characteristics of high recovery efficiency, simple process, mild process conditions and the like.

The invention discloses a preparation method of carbon balance organic liquid fertilizer. The preparation method comprises that organic waste as a raw material and an acid undergo a digestion reaction in an enclosed reaction vessel under microwave irradiation for 3-20min, wherein the acid for the digestion reaction comprises one or more of nitric acid, sulfuric acid, perchloric acid and hydrogen peroxide, a mass ratio of the organic waste to the acid is (10-1): 1 and microwave frequency is in a range of 300MHz-300GHz, and after the digestion reaction, a nanometer synergist is added into the digestion reaction product, wherein the nanometer synergist comprises one or more of nanometer diatomite, nanometer bentonite and nanometer silica. Through synergism of acid digestion and microwave digestion, the micromolecule organic compound easily absorbed by crops is obtained and can provide carbon for the crops and balance crop carbon content.

The invention discloses a dedicated ventilation cabinet used under the acid digestion condition in soil heavy metal detection. The dedicated ventilation cabinet comprises a ventilation cabinet body, amonitor, a controller, a vent system, a cleaning system, an agent adding system and a digestion device. The cross section of the ventilation cabinet body is in a T shape. A digestion table is arranged at the bottom of the ventilation cabinet body, and a water collection tank is arranged around the digestion table. A vent inclined face is arranged on the inner side wall of the ventilation cabinetbody, and the included angle alpha between the vent inclined face and the horizontal plane of the ventilation cabinet body ranges from 10 degrees to 80 degrees. A closed area is defined by the vent inclined face and the inner side wall of the ventilation cabinet body. A monitor camera is mounted at the top in the ventilation cabinet body and electrically connected with the monitor. The dedicated ventilation cabinet mainly solves the problem that in acid smog generated under the acid digestion condition in soil quality monitoring, due to the too large specific gravity, acid liquor drips after being condensed; and through additional mounting of the monitor camera and the monitor, the digestion reacting condition is observed under the condition that a cabinet window is not opened.