128 results about "Acid hydrolysis" patented technology

The invention relates to the technical field of preparation of composite carbon sources, and discloses a method for preparing a micromolecular composite carbon source by using soapstock acidified leftovers, which comprises the following steps: pretreatment: centrifugally separating the soapstock acidified leftovers, recovering crude fatty acid, and regulating the pH value of the water phase to 5.0-6.0 by using an alkaline regulator, performing enzymolysis, namely adding compound protease into the pretreated water phase, performing enzymolysis reaction at 45-55 DEG C, performing organic acid hydrolysis, namely adding small molecular organic acid into a system subjected to enzymolysis, adjusting the pH value of the system to 2.0-4.0, performing hydrolysis reaction at 85-100 DEG C, performing neutralization and post-treatment, cooling the system after the hydrolysis is completed, neutralizing the pH value of the system to 5.5-6.5 by adopting an alkaline substance, and performing post-treatment to obtain a finished product. And filtering to obtain the small molecular carbon source. The alkaline substance is potassium hydroxide, ammonia water or urea. According to the method for preparing the micromolecular composite carbon source by utilizing the soapstock acidified leftovers, the waste liquid, which is the soapstock acidified leftovers generated in the grease refining process and is difficult to biochemically treat, can be converted into the micromolecular composite carbon source with high market value.

This invention discloses a method for determining the arsenic content in ores, belonging to the field of ore element detection technology, comprising the following steps: (1) weighing the ore sample, adding hydrochloric acid-nitric acid mixed acid for acid hydrolysis, then adding hydrofluoric acid and perchloric acid for auxiliary digestion, evaporating to near dryness, and dissolving the residue with hydrochloric acid; (2) adding a thiourea-ascorbic acid-citric acid mixed reducing masking agent to reduce and mask interfering ions; (3) using an atomic fluorescence spectrometer to determine the fluorescence intensity of arsenic in the sample solution, and calculating the arsenic content according to the standard curve. This method achieves accurate and stable determination of arsenic in various ores such as phosphate rock and iron ore by optimizing sample pretreatment conditions, improving the reduction system and matrix interference suppression strategy.

The invention relates to a method for synchronously preparing metastannic acid through ultrasonic enhancement and hydrolysis of low-concentration nitric acid, and belongs to the technical field of metastannic acid preparation. The preparation method comprises the following steps: slowly adding high-purity tin sheets into a dilute nitric acid solution in batches under the stirring condition at the temperature of 35-60 DEG C, and uniformly mixing to obtain a mixed system; and at the temperature of 35-60 DEG C, ultrasonic waves are applied to the mixed system for an ultrasonic enhanced oxidation dissolution-hydrolysis reaction for 30-50 min, so that tin sheets are oxidized and dissolved and are synchronously hydrated to generate metastannic acid precipitates, solid-liquid separation is carried out, solids are sequentially washed and dried, and a high-purity metastannic acid product is obtained. A passivation layer on the surface of the tin sheet is destroyed by utilizing the mechanical effect of ultrasound, and mass transfer is accelerated; the ultrasonic cavitation effect is used for promoting particle refinement and gel network depolymerization, and tin ion hydrolysis is promoted. The method is carried out at normal pressure, low acidity and low temperature, no nitrogen oxide brown smoke is generated in the whole reaction process, the metastannic acid yield is larger than or equal to 95%, and the method has the advantages of being mild in reaction, environmentally friendly, high in efficiency and good in product purity.

The present application belongs to the field of biotechnology, and particularly relates to a biosynthesis gene cluster of fungal polyketide compounds and application thereof. The present application provides a heterologous expression method of an aspertaichunol compound biosynthesis gene combination, and a compound aspertaichunol B is obtained through the method, and a compound aspertaichunol A is prepared through acid hydrolysis of the aspertaichunol B, which has important significance for future research and development of an efficient biosynthesis method for preparing the aspertaichunol compound.

This invention discloses a method for determining the content and simultaneously identifying the source of polyglutamic acid (PCA) in fertilizers based on microwave digestion-high-resolution liquid chromatography-mass spectrometry (LC-MS), belonging to the field of analytical detection technology. The method includes: microwave-assisted acid hydrolysis of fertilizer samples to obtain a hydrolysate; injecting the hydrolysate into a liquid chromatography-high-resolution mass spectrometry (LC-MS) instrument, performing a single injection analysis in data-independent acquisition (DIA) mode, and simultaneously acquiring a mass spectrometry dataset containing a full-scan fingerprint of the parent ion and fragment information of the daughter ion by alternating between low and high collision energies; extracting the precise mass number of PCA from the dataset for accurate quantification, and calculating the PCA content using the difference method; simultaneously retrieving the total ion chromatogram and inferring the source of PCA based on the response of other amino acids. This invention is the first to introduce microwave digestion pretreatment and high-resolution mass spectrometry DIA acquisition mode into the field of PCA detection in fertilizers, requiring only a single injection to simultaneously complete accurate quantification and source identification, effectively avoiding false positives caused by background of plant and animal protein hydrolysates, and significantly improving the efficiency and confidence of PCA detection in complex matrix fertilizers.

This invention relates to the field of analytical chemistry, and in particular to a method for the quantitative determination of total phosphate in aquatic products using acid hydrolysis combined with liquid chromatography-tandem mass spectrometry. The method exhibits good linearity for orthophosphate in the range of 0.1–20.0 mg / L, with a correlation coefficient of 0.9991, a limit of detection of 0.03 g / kg, a limit of quantitation of 0.10 g / kg, and low matrix effect. At spiking levels of 1.0–10.0 g / kg, the intra-day recoveries for shrimp and fish are 89.8%–102.8% and 88.7%–105.8%, respectively; the inter-day recoveries are 90.9%–106.4% and 90.2%–105.8%, respectively; the intra-day RSD is ≤10.0%, and the inter-day RSD is ≤9.6%. This method features simple pretreatment, strong anti-interference capabilities, high sensitivity, and excellent accuracy and precision. It is suitable for the detection of total phosphate in aquatic products, providing a reliable technical means for the supervision of total phosphate in aquatic products, and is highly practical.

Provided is an adhesive composition and the like, the adhesive composition being for forming an adhesive protective layer that protects a to-be-protected surface of a substrate when manufacturing an electronic component device, the adhesive composition containing: a compound that generates an acid by irradiation with an active energy ray; and a polymer having, in a molecule, an ester group that is hydrolyzed by the acid to generate a hydrophilic group.

The invention belongs to the technical field of crystal growth, and particularly relates to a Cs3Cu2I5 single crystal growth method. The method specifically comprises the following steps: taking cesium iodide and cuprous iodide as precursors, carrying out stirring reaction on the precursors and lewis acid in a polar aprotic solvent, hydrolyzing the lewis acid to generate an acid environment, inhibiting Cu < + > oxidation, and meanwhile, forming uniformly dispersed colloidal particles to obtain a precursor solution; and adding an anti-solvent into the precursor solution to enable the precursor solution to reach a supersaturated state, filtering, and carrying out single crystal growth by adopting an inverse temperature crystallization method. Lewis acid is added into the precursor solution, oxidation of Cu < + > is inhibited by utilizing a weak acid environment generated by hydrolysis of the Lewis acid, and the colloid stability of the precursor is improved, so that growth of the high-quality large-size Cs3Cu2I5 single crystal is promoted. The method is simple and convenient to operate and easy to control, can effectively improve the scintillation luminescence performance of the single crystal, and has a wide application prospect.

The invention discloses a preparation method of N-methyl o-fluoroaniline, which is characterized in that o-fluoroaniline is used as a starting raw material, and a target product is efficiently synthesized through three steps of reaction: step 1, in the presence of a solvent and alkali, o-fluoroaniline and acetyl chloride are acetylated at low temperature to generate 2-fluoro-acetanilide, and the product is directly used for the next step after being roughly purified; 2, under the action of a solvent and alkali, carrying out controllable methylation on the 2-fluorine-acetanilide and dimethyl carbonate to obtain 2-fluorine-N-methylacetanilide; and 3, removing acetyl protection through acidic hydrolysis, and adding sodium thiosulfate to prevent oxidation to finally obtain a high-purity product. According to the method, excessive methylation is avoided through an acetyl protection strategy, the process does not need high-risk operations such as ultralow temperature and high pressure, the operation is simple and convenient, the energy consumption is low, and the product purity is gt; the total yield reaches 79.86%, and the method is green, safe and suitable for industrial production.

This invention relates to the field of bioengineering technology, specifically to a cis-epoxysuccinate hydrolase mutant and its applications. The cis-epoxysuccinate hydrolase mutant is obtained by single-point or multi-point mutations at positions 127 and 141 of the amino acid sequence of the wild-type cis-epoxysuccinate hydrolase shown in SEQ ID NO. 1. The single-point mutation involves replacing valine at position 127 with isoleucine, or replacing aspartic acid at position 141 with threonine. The cis-epoxysuccinate hydrolase mutant obtained by this invention exhibits high thermal stability, significantly improving the service life of the cis-epoxysuccinate hydrolase in the industrial production of D(-)-tartaric acid.

The utility model provides a device for removing liquid adhered to the surfaces of solid particles. The device comprises a conveying chain assembly, a suction filtration assembly, filter cloth and a first filter pressing roller, a plurality of suction filtration assemblies are arranged on the surface of the conveying chain assembly in the annular direction of the conveying chain assembly, the suction filtration assemblies are wrapped with the filter cloth in the annular direction, the conveying chain assembly can drive the filter cloth to rotate in the annular direction, the filter cloth is used for bearing solid particles and permeating liquid media, and the suction filtration assemblies are used for suction filtration of the liquid media permeating through the filter cloth. The plurality of first filter pressing rollers are respectively arranged below the suction filtration assembly at the advancing straight line section of the conveying chain assembly; the conveying chain assembly drives the filter cloth to rotate, so that the first filter pressing roller sequentially extrudes the bottoms of the suction filtration assemblies, and solid-liquid separation is achieved. The device for removing the liquid adhered to the surfaces of the solid particles is simpler and more energy-saving, and can effectively solve the problem that the liquid adhered to sugar precipitation particles and lignin particles needs to be separated in the process of producing sugar by hydrolyzing plant fiber raw materials with concentrated acid.

The invention discloses a glycosyl hydrolase derived from intestinal bacteria and application of the glycosyl hydrolase. A glycosyl hydrolase gene for catalyzing trillioside to be hydrolyzed into diosgenin is cloned from intestinal microorganism enterococcus faecalis for the first time, and protein coded by the glycosyl hydrolase gene is identified as multifunctional glycosyl hydrolase; the diosgenin can be catalyzed to generate diosgenin, and the hydrolysis of other saponins such as steroid saponin and C3, C6 and C21 glycosyl of ginsenoside can be catalyzed, so that a basis is provided for the biological enzymolysis of the diosgenin and other saponins or sapogenin. Meanwhile, biological enzymolysis of the diosgenin makes up for the defects of high production cost, serious environmental pollution and the like of a traditional acid hydrolysis method, and the diosgenin has a great application prospect.

The invention relates to the technical field of high polymer materials, in particular to a high-toughness nylon material and a synthesis method thereof. The preparation method adopts a three-step strategy of'protection-polycondensation-hydrolytic conversion ', and comprises the following steps: firstly, reacting a 4-p-toluenesulfonyl aminophenol protective agent with a polyether amine prepolymer with an ester bond side chain to protect an ester bond; secondly, the protected prepolymer and dicarboxylic acid are subjected to efficient polycondensation at the temperature of 160-230 DEG C, and a high-molecular-weight nylon polymer is obtained; and finally, by controlling acid hydrolysis conditions, removing a protecting group, and converting an ester bond side chain into an active carboxylic acid side chain at the same time. The method breaks through the traditional synthesis bottleneck, and the prepared nylon material has excellent mechanical properties brought by high molecular weight and functionality endowed by carboxylic acid side chains, and has important industrial application value.

The invention discloses a method for producing oligosaccharide by cooperatively treating aspergillus niger residues through multiple enzymes. The method comprises the following steps: mixing pretreated aspergillus niger residues with hydrochloric acid, carrying out acidolysis wall breaking, and carrying out suction filtration on an obtained wall-broken mixture; carrying out mixed treatment on filtrate obtained by suction filtration with cellulase and beta-glucanase, filtering, and carrying out concentration and alcohol precipitation on supernate to obtain soluble beta-glucan oligosaccharide; performing filter residue enzymolysis on filter residues obtained by suction filtration by using mesoporous silica immobilized chitinase, and recovering the immobilized chitinase after enzymolysis; and filtering the mixed solution subjected to enzymolysis by using the immobilized chitinase, and carrying out alcohol precipitation on the supernate to obtain the N-acetylglucosamine and the chitosan oligosaccharide. According to the method disclosed by the invention, the aspergillus niger residues are jointly treated by adopting multiple enzymes, the yield of N-acetylglucosamine and chitosan oligosaccharide reaches 85.1%-88.5%, and the yield of beta-glucosamine oligosaccharide reaches 86.7%-89.3%. The invention provides a brand new route for producing various oligosaccharides by utilizing solid waste aspergillus niger residues in the fermentation industry.

This invention belongs to the field of chemical pharmaceutical technology, and particularly relates to a method for preparing an anti-puncture flash evaporation material. Addressing the issue that the hydrophilicity of the molecular structure in existing technologies needs improvement, this invention provides a maleic methylamine polyethylene glycol activated ester and its preparation method, comprising a reaction condensation of 3-maleimide propionic acid and tert-butyl methylamine polyethylene glycol propionate, followed by acid hydrolysis of the ester, and then adding the activated ester for a catalytic reaction to obtain the final product Mal-CH2CH2COO-N(CH3)-(PEG). n -CH2CH2COONHS. This invention creatively designs a maleic methylamine polyethylene glycol activated lipid structure. The methylamine structure can increase solubility in aqueous media, making it more hydrophilic than the existing Mal-CH2CH2COO-PEG-COONHS molecular structure, which is more conducive to the binding of drugs to the human body environment.

The invention provides a method for detecting the content of proinflammatory regression factors (SPMs) in microalgae oil, which comprises the following steps: adding an isotope internal standard substance into a prepared microalgae oil sample to obtain an internal standard sample solution, adding an alkaline reagent into the internal standard sample solution, and carrying out saponification hydrolysis reaction to obtain an alkaline saponification hydrolysis solution; adding an acidic reagent into the alkaline saponification hydrolysis solution, carrying out acidification treatment, and adjusting the alkaline saponification hydrolysis solution to be acidic to obtain an acidified hydrolysis solution; sequentially purifying, concentrating and redissolving the acidified hydrolysis solution to obtain a solution to be detected; performing UPLC-MS / MS detection on the solution to be detected to respectively obtain a first response value of the target component and a second response value of the isotope internal standard substance; and calculating the content of the target component in the microalgae oil sample according to the first response value, the second response value and an internal standard method standard curve. Therefore, the accurate content of the SPMs in the sample can be obtained, and the detection accuracy is improved.

This invention relates to the field of traditional Chinese medicine component research technology, specifically to a method for constructing fingerprint spectra based on the antioxidant active components of Ganoderma lucidum and its application. First, a method for ultrasonic-assisted acid hydrolysis of crude Ganoderma lucidum polysaccharides guided by free radical scavenging activity was constructed. This method is efficient, easy to operate, and can effectively reflect the free radical scavenging activity of the depolymerized Ganoderma lucidum polysaccharides. Hydrophilic chromatography-electrospray ionization detector-electrospray mass spectrometry was used to acid hydrolyze and analyze 52 batches of Ganoderma lucidum polysaccharides from different sources. Further, combined with grey relational analysis and partial least squares regression analysis, 12 common activity peaks were screened, establishing fingerprint spectra based on the antioxidant active components of Ganoderma lucidum. Finally, principal component analysis and partial least squares discriminant analysis were used to analyze the fingerprint spectra based on the antioxidant active components of Ganoderma lucidum for standard Ganoderma lucidum, Ganoderma sinense, Ganoderma applanatum, Ganoderma lucidum var. truncatum, and sample Ganoderma lucidum, respectively, achieving the identification of Ganoderma lucidum varieties.

A process and product obtainable by acid hydrolysis of insects, for example from cricket powder. As one application, an acid hydrolysis product made from powdered crickets may be used as a seasoning sauce resembling soy sauce. The insect powder is hydrolyzed with acid, followed by neutralization, and optionally clarification. In comparison to the typical production of soy sauce, the acid hydrolysis procedure uses insect protein as the main substrate or even the sole substrate. The flavor of soy sauce-like products made from acid-hydrolyzed cricket protein results from a complex combination of compounds generated by the reactions.

This invention discloses a biphasic combined Lewis acid hydrolysis method for extracting diosgenin from fenugreek, belonging to the field of natural product extraction technology. The extraction method disclosed in this invention includes: defatting fenugreek raw material, mixing it with a biphasic reaction system composed of Lewis acid, concentrated hydrochloric acid, methanol, water, and petroleum ether, and carrying out a hydrolysis reaction under heating conditions. After the reaction, the organic phase is separated, concentrated, and dried to obtain diosgenin. This invention innovatively introduces a Lewis acid catalyst into the biphasic acid hydrolysis system of fenugreek, achieving significant results such as a 25% reduction in reaction time, a 50% reduction in concentrated hydrochloric acid usage, and a 25% reduction in water usage while ensuring the extraction rate of diosgenin. This method has advantages such as mild conditions, low acid consumption, short processing time, and environmental friendliness, and is suitable for the large-scale green production of diosgenin.

The invention discloses a high-polysaccharide dendrobium officinale variety germination period directional screening cultivation method, and belongs to the technical field of tissue culture. The invention provides a high-polysaccharide dendrobium officinale variety germination period directional screening cultivation method aiming at the problems that existing dendrobium officinale germplasm is mixed and the polysaccharide content is unstable. According to the method, the concentration of a periodate solution adopted for acidolysis treatment is remarkably reduced, the acidolysis time is shortened, a chromogenic reaction is achieved outside the protocorm, the situation that epidermal cells of the protocorm are excessively damaged and a coloring agent enters the protocorm to cause tissue structure change is avoided, and it is guaranteed that the structure of dendrobium officinale is complete and the shape of dendrobium officinale is stable; meanwhile, the dyeing time is shortened, rapid and lossless identification of the dendrobium officinale high-polysaccharide germplasm in the protocorm stage is achieved, the breeding period is remarkably shortened, and the screening accuracy and efficiency are improved. The cultivated high-polysaccharide dendrobium officinale variety shows consistency and stability in the aspects of polysaccharide content and agronomic traits.

The present application relates to carbocyclic compounds, more particularly to the field of cyclohexanehexol, and particularly to a method for extracting D-chiro-inositol from Ceratonia siliqua and application thereof. The present application uses an acid hydrolysis method, takes TFA as a catalyst, and takes L-(-) camphor sulfonic acid as a specific recrystallization selection agent to obtain high-purity DCI from Ceratonia siliqua, and has the advantages of high extraction efficiency, high DCI yield, high purity, low cost, green environmental protection and the like.

This invention relates to the field of filter aids, specifically to a filter aid and filtration method for acid hydrolysis of phosphate rock using nitric acid. The filter aid is a magnetic carbon filter aid, and its preparation includes the following steps: coarse coal gasification slag is thoroughly mixed with an electrolyte solution containing calcium ions and then ground in a ball mill; the mixture is then transferred to a tubular reactor; the reaction product is then immersed in a solution of alginic acid and amino acid iron, ultrasonically vibrated, and centrifuged to obtain a solid product; the solid product is then further processed in the tubular reactor. During filtration, humic acid is first added to the acid hydrolysis solution, stirred, and allowed to settle for initial pressure filtration to obtain initial filter cake and initial filtrate; then, the magnetic carbon filter aid is added to the initial filtrate, stirred, and allowed to settle for secondary pressure filtration. The filter aid provided by this invention can improve the filtration efficiency of the acid hydrolysis solution, and the filter cake from the initial pressure filtration can be used to produce organic-inorganic mixed fertilizer, purifying the environment; it also lays a foundation for improving the quality of subsequent gypsum.

This application relates to the technical field of vaccine quality testing, specifically to a quantitative detection method for 3D-MLA in liposome adjuvants. The method includes the following steps: taking a test sample solution, adding hydrochloric acid for acid hydrolysis to completely hydrolyze 3D-MLA into D-glucosamine and D-glucosamine-6-phosphate; adding an internal standard solution and a derivatizing reagent to the hydrolyzed sample to perform a derivatization reaction, converting the glycosamine and internal standard into fluorescent derivatives; detecting the derivatized sample using high-performance liquid chromatography-fluorescence detector; and calculating the 3D-MLA content in the test sample using a standard curve method based on the ratio of the total peak area of ​​glucosamine to the peak area of ​​the internal standard. The detection method provided in this application is highly specific, sensitive, easy to operate, and suitable for large batches of samples.

This invention discloses a method for recovering fluoride from white fertilizer while simultaneously preparing slow-release nitro fertilizer, belonging to the field of clean processing and utilization technology of phosphorus resources. This invention uses nitric acid to perform staged acid hydrolysis of white fertilizer. The phosphorus-containing filtrate after preliminary acid hydrolysis has a low impurity content and can be used to prepare water-soluble ammonium phosphate. The remaining acid hydrolysis residue undergoes complete acid hydrolysis to completely leach phosphorus and fluoride elements, followed by defluorination. Fluorine precipitates as fluorosilicates, which can be further separated to obtain fluorosilicate products. The defluorinated liquid is neutralized and dried to obtain the slow-release nitro fertilizer product. This method comprehensively utilizes the phosphorus and fluoride resources in white fertilizer, achieving clean processing and utilization of phosphorus resources. The overall process of the method described in this invention is simple to implement, has low production costs, and fully utilizes the phosphorus and fluoride resources in white fertilizer.

This invention discloses a method and system for recovering high-purity potassium bicarbonate and potassium sulfate from dust collected during blast furnace ferromanganese smelting. It proposes for the first time a technical route for recovering potassium bicarbonate and potassium sulfate by washing blast furnace ferromanganese smelting dust. Addressing the characteristics of the ash washing wastewater, pre-oxidation coupled with reduction impurity removal achieves efficient removal of sulfite and high-valence iron and manganese ions without introducing new impurities, significantly improving the purity of the recovered potassium salts. Secondly, considering the difficulty and cumbersome operation of separating carbonate, sulfate, and chloride ions, and taking into account the carbon dioxide consumption required for potassium bicarbonate preparation, the invention employs acid hydrolysis of carbonates to recover carbon dioxide, recycling carbon, and controlling the liquid-phase anion composition to co-produce high-purity potassium bicarbonate and potassium sulfate, reducing the cost of bicarbonate recovery and the difficulty of salt separation. Simultaneously, it achieves zero emissions of wastewater and waste gas.

The invention discloses a ginseng polysaccharide composition for relieving liver injury caused by staying up late and a preparation method, and relates to the field of biological medicine, the ginseng polysaccharide composition comprises the following components by weight: 30%-70% of a spore-ginseng polysaccharide compound, 10%-40% of a radix puerariae extract, 5%-20% of a schisandra chinensis extract, and the balance of pharmaceutically or food acceptable auxiliary materials; the spore-ginseng polysaccharide compound is formed by loading ginseng polysaccharide modified by acid hydrolysis on probiotic spores; according to the composition, ginseng polysaccharide and acid-resistant probiotic spores are compounded to prepare a spore-ginseng polysaccharide compound serving as a core component, so that the spores become natural protective shells and targeting carriers, and the ginseng polysaccharide can resist gastric acid erosion and is accurately and sufficiently delivered to intestinal tracts; the bioavailability of the active component at the target part is greatly improved, so that the ginseng polysaccharide can directly play key roles in repairing the barrier and regulating the immune microenvironment locally in the intestinal tract.

The utility model provides a condensing device and an acid hydrolysis instrument, and relates to the technical field of acid hydrolysis. The condensing device provided by the utility model comprises a condensing cover assembly and a condensing pipe, the condensation cover assembly is used for covering the hydrolysis container, and the condensation cover assembly is provided with a first cooling liquid flow path; the condensation pipe is connected with the condensation cover assembly; the condensation pipe is provided with a condensation gas path and a second cooling liquid flow path, the condensation gas path exchanges heat with the second cooling liquid flow path, and the condensation gas path is in fluid communication with the hydrolysis container. In the hydrolysis process, one part of steam can be shielded and condensed by the condensation cover assembly so as to flow into the hydrolysis container, and the other part of steam can be condensed into a liquid state in the condensation gas path and flows back into the hydrolysis container, so that the technical problem that the concentration of hydrolysate is changed due to evaporation is relieved, the concentration of the hydrolysate can be kept stable, and the hydrolysis efficiency is improved. And the influence of acid gas on the atmospheric environment is avoided.

A method for quantifying a cellulosic component in a sample includes hydrolyzing the sample in a single acid hydrolysis step of the sample in aqueous sulfuric acid having a concentration of 15 wt-% to 60 wt-%, at an incubation temperature of 50° C. to 98° C., at ambient pressure, for an incubation period of 30 min to 360 min; separating a supernatant from the hydrolyzed sample in aqueous sulfuric acid; analyzing the supernatant for total content of glucose and xylose and one or more of mannose, galactose, and arabinose; and calculating, based on the analysis, the amount of the cellulosic component, wherein the cellulosic component includes hemicellulose, cellulose, or both.

This invention belongs to the fields of chemical metallurgy and environmental protection technology, specifically relating to a method for recovering ferrophosphate and simultaneously removing thorium from rare earth waste residue, and a ferrophosphate product. The method targets rare earth waste residue containing insoluble ferrophosphate. After grinding pretreatment, it undergoes enhanced acid hydrolysis at 75-85°C using 70-80% sulfuric acid. The high concentration of protons disrupts pyrophosphate bonds, achieving efficient leaching of phosphorus and iron while inhibiting the dissolution of calcium impurities. The strongly acidic filtrate after solid-liquid separation is subjected to multi-stage extraction using a primary amine extractant (N1923) to selectively remove radioactive thorium. The raffinate is then pH-controlled to induce the synthesis of battery-grade ferrophosphate. This invention achieves a phosphorus recovery rate >92% and a thorium removal rate >99.5%, not only solving the environmental pollution problem caused by rare earth waste residue storage but also preparing a high-value-added lithium battery cathode material precursor.