29 results about "Glyoxal" patented technology

The invention discloses a preparation process of berberine hydrochloride, and belongs to the technical field of berberine production. The invention relates to a berberine hydrochloride preparation process, which comprises: S1, mixing a ferric sulfate-aluminum sulfate composite salt, sodium chloride, zinc chloride and anhydrous formic acid, pre-activating, adding N-2, 3-dimethoxybenzyl homopiperony lamine hydrochloride, dropwise adding a glyoxal mixed solution, and carrying out a reflux reaction. And S2, cooling the reaction liquid until a solid is separated out, filtering, adding a filter cake and diatomite into purified water, stirring, adjusting alkali, heating, and continuously stirring for 0.5-1 hour. Cooling and filtering, and reserving filtrate; s3, adjusting the acidity of the filtrate, cooling and growing crystals; and filtering, rinsing a filter cake, and carrying out vacuum drying on the filter cake to obtain berberine hydrochloride. The berberine hydrochloride prepared by the method is high in yield and purity, and the preparation process is safe, short in flow and friendly to human bodies and environment.

The invention discloses a preparation method of an antibacterial warm-keeping fabric, and relates to the technical field of textiles. When the antibacterial warm-keeping fabric is prepared, firstly, (E)-butyl-2-ene-1, 4-diamine, glyoxal, formaldehyde and butyric acid are used as raw materials to synthesize a polyimidazolium salt antibacterial agent, then the polyimidazolium salt antibacterial agent is copolymerized with polytetrahydrofuran ether glycol and diphenylmethane diisocyanate to prepare an antibacterial polyurethane spinning solution, and the antibacterial fabric is obtained through wet spinning and weaving. The preparation method comprises the following steps: reacting L-cysteine with 3-amino propyl triethoxy silane to prepare cysteamine acyl propyl triethoxy silane, reacting with formaldehyde and phosphorous acid to obtain flame-retardant modified silane, and further preparing a silicon dioxide solution from the flame-retardant modified silane and sol-gel such as methyltrimethoxysilane; finally, the antibacterial fabric is treated with a benzophenone solution and then soaked with a silicon dioxide solution, and the antibacterial thermal fabric is prepared through ultraviolet irradiation, standing gelation, aging and hexane washing. The prepared fabric has excellent antibacterial property, heat retention property and flame retardant property.

The invention relates to the technical field of paper wet strength agents, in particular to an environment-friendly wet strength agent and a preparation method thereof. The preparation method of the wet strength agent comprises the following steps: under the action of a catalyst, succinic acid, maleic acid and triethylene tetramine react to obtain an unsaturated polyamide polyamine prepolymer; adding water into the unsaturated polyamide polyamine prepolymer to adjust the solid content, heating, adding double-bond-containing nanocellulose, tea saponin, glycidyl acrylate and an initiator, and reacting to obtain an intermediate emulsion; cooling the intermediate emulsion to room temperature, adding epichlorohydrin to react for 0.5-3 hours, heating to 50-75 DEG C, continuing to react for 1-5 hours, cooling reaction liquid to 25-30 DEG C, adding glyoxal to react for 0.5-1 hour, adjusting the pH value of the reaction liquid after the reaction is completed, and adding water to adjust the solid content, thereby obtaining the product. The preparation method is simple in process, and the prepared wet strength agent can reduce organic chlorine residues.

The utility model discloses a silver-method formaldehyde and organic waste gas incineration and waste heat recovery device, which relates to the technical field of environmental protection and comprises a first incinerator, a second incinerator, an induced draft fan and a waste heat recovery system. The waste heat recovery system is arranged at the rear end of the first incinerator, and the induced draft fan is arranged at the rear end of the waste heat recovery system. Formaldehyde tail gas is used as fuel to incinerate organic waste gas, such as urea resin waste gas, workshop low-concentration waste gas, glyoxal waste gas, Cwaste gas and the like; waste gas resources generated in the production process are fully utilized, the cost expenditure for additionally purchasing other fuels is avoided, effective recycling of the resources is achieved, the production cost is reduced, and the waste heat steam boiler can recycle most heat and generate steam which can be further used for other industrial production links or heat supply and the like. The energy saver is used for heating boiler feed water, and the energy utilization efficiency is improved.

This invention provides an antistatic and privacy-protecting polarizing film and its preparation process, belonging to the field of polarizing film preparation technology. The preparation process includes the following steps: preparation of an antistatic agent; preparation of a modified adhesive; preparation of a composite polarizing film; and preparation of the polarizing film. This invention introduces an antistatic agent and POSS-modified graphene oxide into the modified adhesive, making the adhesive layer a conductive medium connecting multiple layers such as the polarizing film (PVA), TAC layer, and privacy film, forming a cross-layer conductive path. This avoids static electricity accumulation at the interface, improving the antistatic effect. Boric acid is first used to crosslink the PVA film, followed by glyoxal crosslinking, achieving long-term reliability of the polarizing film under high temperature and high humidity environments.

The invention relates to the field of gypsum-based building materials, and particularly discloses a preparation method of a lysine-tannic acid compound retarder and a gypsum-based building material.The preparation method comprises the following steps that 1, tannic acid and copper acetate are added into water to be stirred, and a copper-tannic acid pre-coordination solution is obtained; then adding L-lysine into the mixture, and stirring for reaction to obtain precursor liquid after the reaction is completed; and (2) adding glyoxal into the precursor liquid for reaction, and then adding dialdehyde polyethylene glycol for continuous reaction to obtain the compound retarder. The gypsum-based building material comprises the following components: alpha-semi-hydrated gypsum, cement, slag powder, the lysine-tannic acid compound retarder, a water reducing agent and mixing water. The retarder provided by the invention not only has a good retarding effect on the gypsum-based building material, but also can improve the early strength of the gypsum-based building material, and effectively overcomes the contradictory problem of retarding and early strength.

This invention relates to a silicon-modified inorganic stone-like paint and its preparation method. The silicon-modified inorganic stone-like paint is mainly prepared from the following components in parts by weight: 10-20 parts of cyclosiloxane monomer-modified styrene-acrylic emulsion, 1-10 parts of epoxy-modified silica, 0.02-1 parts of methacryloyloxy-modified silica, 0.02-0.5 parts of glyoxal-modified hydroxyethyl cellulose ether, 60-75 parts of colored sand, 0.02-0.5 parts of ammonia, 0.2-1 parts of film-forming aid, 0.2-1 parts of antifreeze, 0.02-0.5 parts of thickener, 0.02-0.5 parts of defoamer, 0.02-0.5 parts of bactericide, and 7.85-13.48 parts of water. The silicon-modified inorganic stone paint of the present invention has excellent initial water spraying resistance to whitening, storage stability, high spraying atomization efficiency, good anti-splashing properties and low sand shedding rate, and can be widely used in old house renovation and urban renewal.

This invention provides a method for purifying seawater used in aquaculture, comprising the following steps: Step 1: After allowing seawater to settle, the supernatant is filtered, and a flocculant is added to the coarse filtrate before further filtration; Step 2: The filtrate is treated with a composite purification material and filtered to obtain purified seawater for aquaculture; The composite purification material is prepared as follows: S1: Tourmaline powder and maifanite powder are dried and calcined at high temperature to obtain calcined material; S2: Algae, EM bacteria, and puffed corn starch are mixed, and sodium alginate and polyvinyl alcohol are added and mixed, then dried to obtain a starch composite material; S3: Humic acid is dissolved in NaOH solution, Fe3O4 powder and polyethylene glycol are added, stirred and mixed, filtered, and washed to obtain composite material A; S4: The calcined material is mixed with silane coupling agent, glyoxal, starch composite material, and composite material A, washed, dried, and pulverized to obtain the composite purification material; This invention can effectively purify aquaculture water and has good performance.

The application discloses a method for preparing a conjugated Schiff base in situ on cotton fabric and application thereof, and utilizes sodium periodate to oxidize cotton fabric to obtain aldehyde fiber, and then forms a loaded conjugated Schiff base cotton fabric in situ on the aldehyde fiber through a p-phenylenediamine and glyoxal polycondensation reaction, tests the UPF, tensile breaking strength, crease recovery angle and contact angle of the cotton fabric before and after finishing to represent changes in ultraviolet resistance, tensile property, crease recovery and hydrophilicity of the cotton fabric. + The in-situ grafting process of the cotton fabric has a smaller influence on the strength of the cotton fabric, and the crease recovery angle and the contact angle of the finished cotton fabric are obviously increased.

The application relates to a preparation method of a dicyandiamide resin grafted keratin tanning agent for leather processing. Waste cattle hair is added with deionized water, alkali, calcium hydroxide, polyaluminum chloride and polyacrylamide flocculation precipitation, filtration, filtration liquid is taken, drying is carried out, the filtration liquid is dissolved in water, pH value is adjusted, 5,5-dihydroxyvaleraldehyde and sulfuric acid are added, pH value is adjusted, benzene carboxylic acid containing is taken, dissolved in thionyl chloride, N,N-dimethylformamide is added, rotary evaporation is carried out to obtain benzene carboxylic acid containing, dicyandiamide, aldehyde group functionalized keratin, glyoxal, glutaraldehyde, ethanol are mixed, pH value is adjusted, then benzene carboxylic acid containing and diethyl ether are added, and pH value is adjusted. Through the flocculation effect of calcium hydroxide, dirt and impurities in the cattle hair are captured, a large amount of water and surfactants are saved, no wastewater is discharged; the reactivity of amino groups and carbonyl groups is utilized to obtain aldehyde group functionalized keratin; the addition reaction of aldehyde group functionalized keratin and dicyandiamide can occur, the molecular weight of the dicyandiamide grafted keratin is increased, and the grafting rate is improved.

The application discloses a surface sizing agent for corrugated paper and boxboard, a preparation method and application thereof, and belongs to the technical field of papermaking. The surface sizing agent is prepared by using water as a solvent, adopting an oxidation-reduction initiation system, combining with glyoxal post-crosslinking and polyaluminum chloride / aluminum sulfate post-treatment. The product has low foam, high stability and good paper machine adaptability. After the surface sizing agent is applied to the surface sizing of corrugated paper and boxboard, the ring crush index is increased by 18% to 25%, the Cobb value is reduced by more than 70%, the surface strength and breaking degree resistance are obviously improved, and the quality requirements of high-strength packaging paper are met. The preparation method is green and environment-friendly, and is easy for industrialized production.

Methods of forming paper products are provided herein. A method comprises providing an aqueous suspension of cellulosic fibers; diluting the aqueous suspension with water to form a diluted aqueous suspension having a solids content from about 0.3 wt % to about 1.8 wt %, based on a total weight of the diluted aqueous suspension; subjecting the diluted aqueous suspension to a high shear operation; adding an aqueous composition comprising an adduct formed from the reaction of glyoxal and a polyvinylamide prepolymer to the diluted aqueous suspension; forming the diluted aqueous suspension into a sheet; and drying the sheet. The aqueous composition is added after the diluted aqueous suspension is subjected to the high shear operation and before the diluted aqueous suspension is passed to a headbox. The method is free of any high shear operation after the aqueous composition is added and before the diluted aqueous suspension is passed to the headbox.

The application discloses a synthetic method suitable for industrial production of berberine and berberine hydrochloride, which comprises the following steps: adding berberine acetonitrile, o-veratraldehyde, an alcohol reaction solvent and a mixture of anhydrous copper sulfate-Pd / C in a reaction container in proportion, carrying out a reduction reaction by introducing hydrogen under the conditions of 50-70 DEG C and 0.3-0.8 MPa, removing the hydrogen after the system stops eating hydrogen, adding glyoxal, stirring and heating to 80-100 DEG C, reacting for 4-8 hours or more, cooling to room temperature, and then carrying out suction filtration to obtain a berberine methanol solution; the berberine methanol solution is subjected to post-treatment to obtain berberine or hydrogen chloride is introduced to obtain berberine hydrochloride by crystallization. The catalyst is matched by Pd / C and anhydrous copper sulfate, the temperature and pressure requirements in the reaction process are improved, the traditional high-temperature and high-pressure reaction is reduced to controllable reaction temperature and pressure, the reaction risk is greatly reduced, the catalyst can be recycled and reused, and the material cost and three-waste treatment are reduced.

The invention discloses ionic polyurethane gel as well as a preparation method and application thereof, the method comprises the following steps: mixing formaldehyde, glyoxal and 1, 4-butanediamine, stirring and reacting to obtain polyionic liquid; the preparation method comprises the following steps: carrying out prepolymerization reaction on polypropylene glycol bis (2-aminopropyl ether) and isophorone diisocyanate in a nitrogen atmosphere to obtain an isocyanate-terminated prepolymer solution; adding adipic dihydrazide into the prepolymer solution, carrying out a first chain extension reaction, then adding a polyion liquid, and carrying out a second chain extension reaction to obtain a PIM / ADH-coated PU solution; after the PIM / ADH coated PU is dried, a PIM / ADH coated PU film is obtained; and dissolving the PIM / ADH coated PU film, then adding 1-butyl-3-methylimidazole bis (trifluoromethylsulfonyl) imide, stirring to obtain a mixed solution, and drying to obtain the ionic polyurethane gel. The ionic polyurethane gel has self-repairing capability and stable ionic liquid bonding performance.

The invention relates to the technical field of high polymer materials, in particular to a flame-retardant anti-aging composite material and a preparation method thereof. Comprising the following components in parts by weight: 60-80 parts of nylon resin, 15-25 parts of filler, 5-18 parts of a halogen-free flame retardant, 3-7 parts of a solubilizer, 2.1-3.5 parts of a lubricant, 0.6-1.2 parts of an antioxidant, 0.5-2.4 parts of a light stabilizer and 1-3 parts of a plasticizer, the halogen-free flame retardant is an alkali lignin-based nitrogen-phosphorus flame retardant, the alkali lignin-based nitrogen-phosphorus flame retardant is prepared by performing carboxymethylation modification on industrial alkali lignin through sodium chloroacetate to prepare water-soluble carboxymethyl alkali lignin, and taking glyoxal, urea and melamine as raw materials to synthesize melamine urea-formaldehyde resin. And then compounding the carboxymethyl alkali lignin, melamine urea-formaldehyde resin and diammonium hydrogen phosphate to prepare the water-retaining agent. The material has the advantages of high mechanical strength, good balance between rigidity and toughness, and excellent high-temperature performance and chemical resistance.

This invention discloses a reversible thermochromic composite material, belonging to the technical field of thermochromic composite materials. It is a multi-component system formed by using 2,6-monosubstituted linear phenolic resin as a color developer, combined with crystal violet lactone, a monohydric alcohol mixture, and natural rubber. The 2,6-monosubstituted linear phenolic resin is polymerized using bisphenol A, glyoxal, and glutaraldehyde as comonomers. The monohydric alcohol mixture is formed by mixing hexadecyl alcohol and octadecyl alcohol. This method minimizes interference with H+ while preserving the OH group. + The reversible thermochromic composite film prepared by using 2,6-monosubstituted linear phenolic resin (GA-BPA-GDA) as a color developer exhibits good thermal stability and recyclability.

The application discloses a bactericidal air freshener and a preparation method thereof, and belongs to the field of daily chemicals. The bactericidal air freshener comprises a propellant and a liquid medicine, and the liquid medicine comprises the following components in percentage by weight: d-trans-chloropropene chrysanthemum ester 0.04%-0.08%, hexachlorophene 0.4%-0.8%, glyoxal 3%-7%, a cosolvent 25%-35%, essential oil 0.2%-0.45%, and the balance of water. The preparation method of the bactericidal air freshener comprises the following steps: mixing hexachlorophene, glyoxal, essential oil and the cosolvent uniformly, then adding d-trans-chloropropene chrysanthemum ester, continuously mixing and stirring uniformly, adding water, continuously mixing and stirring uniformly, and preparing the liquid medicine; adding the liquid medicine into a tank body, then filling the tank body with the propellant, and preparing the bactericidal air freshener. The bactericidal air freshener has the advantages of improving the bactericidal and insecticidal capacity of the air freshener.

The present application relates to the technical field of tire rubber manufacturing, and discloses a lignin reinforced high-temperature-resistant rubber product and a preparation method thereof.The rubber product, based on 100 parts by weight of raw rubber, comprises 25-35 parts of lignin masterbatch, 20-50 parts of nano filler, 1-15 parts of active agent, 1-5 parts of vulcanizing agent, 0.1-4 parts of accelerator and 0-10 parts of coupling agent.The lignin masterbatch is prepared by adding the modified lignin under alkaline conditions by catechol and bio-based glyoxal into rubber latex and wet mixing.The lignin masterbatch can improve the dispersion and interfacial bonding of lignin in rubber, improve the tensile strength, modulus and high-temperature mechanical properties of the rubber product, and is suitable for the preparation of lignin reinforced high-temperature-resistant rubber products.

This invention discloses a writing paper that protects eyesight and its preparation method. The preparation method includes the following steps: uniformly coating the upper and lower surfaces of 100% bleached wood pulp paper with a carbon black coating. The carbon black coating includes pretreated carbon black, kaolin, latex, polyvinyl alcohol, and a crosslinking agent, glyoxal. The pretreated carbon black is prepared by mixing carbon black stock solution and styrene-acrylic emulsion at a mass ratio of 100:10, stirring and reacting in a reactor for 60-120 minutes while maintaining the temperature at 70-80℃. This invention effectively reduces the whiteness of 100% bleached wood pulp paper by coating the 100% bleached wood pulp substrate layer with a coating containing pretreated carbon black, thus protecting the eyes and making the writing paper more visually comfortable. It also increases opacity, preventing the writing paper from being too transparent. Furthermore, the carbon black coating layer is prepared by coating, avoiding the impact of directly adding carbon black to the pulp on the entire paper machine system. It eliminates the need to clean the entire paper machine system, resulting in low production costs, less environmental pollution, convenient cleaning, and energy savings.

Methods of forming paper products are provided herein. A method comprises providing an aqueous suspension of cellulosic fibers; diluting the aqueous suspension with water to form a diluted aqueous suspension having a solids content from about 0.3 wt% to about 1.8 wt%, based on a total weight of the diluted aqueous suspension; subjecting the diluted aqueous suspension to a high shear operation; adding an aqueous composition comprising an adduct formed from the reaction of glyoxal and a polyvinylamide prepolymer to the diluted aqueous suspension; forming the diluted aqueous suspension into a sheet; and drying the sheet. The aqueous composition is added after the diluted aqueous suspension is subjected to the high shear operation and before the diluted aqueous suspension is passed to a headbox. The method is free of any high shear operation after the aqueous composition is added and before the diluted aqueous suspension is passed to the headbox.

This invention provides an apparatus and method for simultaneously measuring the concentrations of formaldehyde and glyoxal in the atmosphere. The apparatus includes a sample introduction system, an excitation light source, a main cavity, a spectrometer, a wavelength and power correction system, and a software control system. This method can rapidly and accurately measure the concentrations of formaldehyde and glyoxal in the atmosphere simultaneously with time resolution. This invention utilizes a highly selective and sensitive laser-induced emission spectrometer to achieve real-time monitoring of VOCs in hazy weather. It employs time-division multiplexing technology to achieve multi-level selectivity of the results, eliminating interference from field measurements, providing experimental support for tracing the sources of VOCs emissions, and providing strong technical support for studying the intrinsic mechanisms of atmospheric VOCs reaction kinetics. It boasts higher resolution, faster detection speed, and the ability to obtain more multi-dimensional data, and also has advantages such as low cost, modularity, and miniaturization.

The application relates to a preparation method of an amino resin retanning agent based on tanning waste cattle hair, 100 parts of waste cattle hair, deionized water, alkali, calcium hydroxide, polyaluminum chloride and polyacrylamide are added for flocculation and precipitation, the filtrate is taken and dried; the dried product is dissolved in water, the pH value is adjusted, 4,4-dimethoxy-2-butanone (CAS:5436-21-5) and sulfuric acid are added; the product is dissolved in thionyl chloride, N,N-dimethylformamide is added, and rotary evaporation is carried out; aldehyde group keratin, formaldehyde, acetaldehyde and glyoxal are added, ethanol is added, the pH value is adjusted, p-aldehyde benzoic acid is added, the pH value is adjusted, and vacuum drying is carried out. In the application, the dirt and impurities in the cattle hair are flocculated by the flocculation of calcium hydroxide, a large amount of water and surfactant washing is saved; the residual amino and hydroxyl groups are consumed by activated p-aldehyde benzoic acid, more active carboxyl groups and active aldehyde groups are introduced, the reaction activity of melamine grafted keratin and skin collagen fibers is improved, and tanning and filling properties are given.

Fiber-containing composites are described that contain woven or non-woven fibers, and a cured binder formed from a binder composition that includes (1) a reducing sugar and (2) a crosslinking agent that includes a first carbon moiety selected from an aldehyde, a ketone, a nitrile, and a nitro group, wherein an α-carbon atom having at least one acidic hydrogen is directly bonded to the first carbon moiety. Exemplary reducing sugars include dextrose and exemplary crosslinking agents include glyoxal. Exemplary fiber-containing composites may include fiberglass insulation.

The application provides a method for synthesizing tetrabutyl phenolic aldehyde of formula (I), comprising the following steps: firstly, reacting para-tert-octyl phenol of formula (III) with formaldehyde under alkaline conditions to obtain 2,5-dihydroxymethyl para-tert-octyl phenol of formula (IV); then, reacting the 2,5-dihydroxymethyl para-tert-octyl phenol of formula (IV) with the para-tert-octyl phenol of formula (III) under acidic conditions to obtain phenolic aldehyde resin of formula (II); finally, reacting the phenolic aldehyde resin of formula (II) with ethylene oxide to obtain tetrabutyl phenolic aldehyde of formula (I).

The invention belongs to the technical field of wastewater treatment, and particularly relates to an environment-friendly treating agent for papermaking wastewater and a preparation method thereof. The treating agent comprises a component A and a component B, the mass ratio of the component A to the component B is 1: (5-10); the component A is prepared from the following raw materials in parts by weight: 20 to 25 parts of polyacrylamide, 1 to 2 parts of glyoxal, 0.01 to 0.03 part of initiator and 50 to 60 parts of deionized water; the component B is prepared from the following raw materials in parts by weight: 10 to 20 parts of modified bentonite and 1 to 5 parts of plant extract. The treating agent has excellent heavy metal ion adsorption capacity, high sedimentation rate and comprehensive decontamination effect, and meanwhile, the risk of secondary pollution is reduced from the source.

The invention discloses a dust suppression material with high moisture retention and wind erosion resistance. The dust suppression material is prepared from the following raw materials in parts by mass: 3-8 parts of flaxseed gum, 2-5 parts of glyoxal, 2-6 parts of polyglutamic acid, 2-4 parts of a wetting agent, 1-2 parts of a catalyst, 2-6 parts of a water-retaining agent and 1000-2000 parts of distilled water. According to the dust suppression material, a rigid framework constructed by flaxseed gum-glyoxal provides a wind-erosion-resistant core support, and polyglutamic acid molecules grafted through chemical bonds form a moisturizing and water locking layer; the dust suppression material can form a layer of tough, compact and moisture-rich dust suppression film on the surface of coal dust, so that secondary flying of the coal dust can be prevented, and humidity and structural integrity can be maintained for a long time in severe environments such as drought and windy environments.

The application relates to the technical field of papermaking processing, in particular to a preparation method of an aerogel type papermaking additive based on composite fiber materials, which comprises the following steps: S1, diluting an additive intermediate with water, adjusting the pH value to 9.0-9.5, stirring and mixing for 12-18 minutes, and controlling the temperature at 32-36 DEG C to obtain an additive intermediate solution; S2, adding glyoxal to the additive intermediate solution under stirring, adjusting the pH value to 9.0-9.3, reacting until the viscosity of the material reaches 20-50 cps, stopping the reaction when the pH value is adjusted to 2.5-4.0, and adding an aerogel type composite fiber material after the reaction is completed, fully stirring and dispersing to obtain a papermaking additive. The papermaking additive prepared in the application can effectively improve the tensile strength and ring pressure strength of paper when introduced into a papermaking process, so that the paper has excellent strength and toughness, and can better meet the needs of special industries.

This application provides a smart thermochromic phase change microcapsule composite material for architectural glass, its preparation method, and its application, relating to the field of building energy-saving materials technology. The composite material comprises a phase change core material composed of tetradecyl alcohol, butyl stearate, and docosane; a composite wall material composed of urea-formaldehyde prepolymer, melamine prepolymer, and glyoxal-modified starch; and is prepared in conjunction with cuprous thiocyanate nanowires, a thermal conductivity modifier, and a transparent film-forming matrix. Through multi-component synergistic design, the thermochromic, phase change heat storage, and transparent film-forming properties are unified, significantly improving the composite material's thermal response sensitivity, heat storage stability, and photothermal regulation capability. Simultaneously, it improves the light transmittance, thermal insulation performance, and cycle life of architectural glass, and can be widely applied in the field of energy-saving smart architectural glass.

The application discloses a preparation process of berberine hydrochloride and belongs to the technical field of berberine production. The preparation process of the berberine hydrochloride comprises the following steps: S1, mixing iron sulfate-aluminum sulfate composite salt, sodium chloride, zinc chloride and anhydrous formic acid to pre-activate, adding N-2,3-dimethoxybenzyl piperidyl ethylamine hydrochloride, and dropwise adding a glyoxal mixed solution to perform reflux reaction; S2, cooling the reaction solution to precipitate solids, filtering, stirring the filter cake and diatomite in pure water, adjusting alkalinity, continuously stirring for 0.5-1 hours after temperature rising, cooling and filtering, and reserving the filtrate; S3, adjusting the filtrate to be acidic, cooling and crystallizing, filtering, rinsing the filter cake, vacuum drying the filter cake to obtain the berberine hydrochloride. The berberine hydrochloride prepared by the application has high yield and high purity, the preparation process is safe, the process is short, and the application is friendly to human bodies and the environment.