31results about "Stannous chloride" patented technology

A method for synthesis of lactic acid and its derivatives is provided. First, a mixture is prepared, which includes: at least one carbohydrate-containing raw material, at least one alcohol, at least one composite catalyst containing metal chloride(s) (MCln) and tin-containing compound(s), and at least one solvent, wherein M is selected from a group consisting of Li+, Na+ K+, Mg2+, Ca2+, Sr2+, Ga3+, In3+, Sb3+, Bi3+, Cr3+, Mn2+, Fe2+, Co2+, Ni2+, Zn2+, and n represents 1, 2 or 3. Then, the mixture is heated to obtain lactic acid and its derivatives. By using the above catalyst and method, it is capable of converting carbohydrate-containing raw material to lactic acid and its derivatives directly in a more efficient and economical way.

The invention relates to a method for producing an inorganic tin compound, in particular to a method for large-scale production of anhydrous stannous chloride, which belongs to the technical field of chemical industry. The method of the present invention uses SnCl 2 2H 2O as the raw material to dry in two stages, the first stage controls the heating and concentration temperature to be less than 130°C under normal pressure, adds an organic dispersant, and the second stage is vacuum-dried to control the drying temperature The temperature is 90-110°C, and the vacuum degree is lower than 0.075MPa. The invention has simple technological process, is easy to control, has high product purity, can utilize ordinary chemical equipment, and effectively solves the problem of equipment corrosion. The main content of the product prepared by the method is more than 99%, and the solution is clear after being dissolved in hydrochloric acid solution.

The invention provides a method for preparing reagent-grade stannous chloride dehydrate crystals from industrial-grade raw materials. The method comprises the following steps: melting industrial tin ingots and quenching the molten industrial tin ingots into tin flower; then enabling reaction between filtered industrial hydrochloric acid and tin hydroxide to produce stannic chloride pentahydrate; adding the tin flower into the stannic chloride pentahydrate solution; enabling heat-insulating reaction for 12-18 h at 100-105 DEG C; when the mass concentration of quadrivalent tin in the solution is detected to be less than 0.01%, concentrating under reduced pressure till the specific weight of the solution is 2.0-2.4; filtering the solution into a cooling device to be cooled for 12-20 h at 0-10 DEG C; then discharging; carrying out vacuum suction filtration and centrifugal separation to obtain the required reagent-grade stannous chloride dehydrate crystals. The preparation method is short in process route, simple to operate, easy for processing parameter control and relatively high in production efficiency; the obtained product can meet the standards of the reagent-grade (high-purity) stannous chloride dehydrate crystals without crushing or screening, and can satisfy the requirements of industries (such as chemical analysis, catalytic synthesis and PCB colloid-Pd sensitization) which demand much on the quality of stannous chloride.

The invention discloses a synthetic method of stannous chloride. The method comprises the following steps: by using anhydrous stannic tetrachloride and hydrochloric acid with concentration of 20 wt% as raw materials, adding a precious metal catalyst, heating to 110 to 140 DEG C, introducing hydrogen with the pressure intensity of 1.5 to 3MPa, performing heat insulation reaction for 2 to 6 hours at125 to 135 DEG C, and performing press filtration to obtain a stannous chloride solution and a dilute hydrochloric acid solution with required concentrations; then performing concentration and crystallization to obtain a stannous chloride crystal. According to the synthetic method of stannous chloride disclosed by the invention, by using hydrogen as a reducing agent, a catalyst can be reacted andrecycled for being reused, and the phenomenon that tin is used as the reducing agent in a conventional process is avoided, so that the interference of impurity elements carried by metal tin on the quality of a product is effectively eliminated. The method disclosed by the invention has the advantages of stable process, strong operability, low cost, environment-friendly property, high security andthe like, and can be applied to industrial popularization.

The present disclosure provides a catalyst for preparing lactic acid and derivatives thereof, comprising at least one of metallic compounds MXn, wherein M is selected from Na, K, Mg, Ca, Sr, Ba, Al, Ga, In, Sn, Sb, Bi, Cr, Mn, Fe, Co, Ni and Zn, and n is an integer of 1 to 6. The present disclosure further provides a method for synthesis of lactic acid and derivatives thereof, wherein at least one raw material including carbohydrates, at least one alcohol, at least one of the aforesaid catalysts and at least one solvent are heated to react to prepare lactic acid and derivatives thereof.

The invention relates to an ordered spherical large mesoporous α-Fe2O3 material, which belongs to the technical field of material preparation. The present invention adopts colloidal crystals closely packed and arranged in the three-dimensional direction of polymethyl methacrylate milk balls with a ball diameter of 71±5nm as a template, impregnates the template with an ethanol-water mixed solution of FeC2O4 2H2O, heats and solidifies, and roasts to remove PMMA template, obtained spherical large mesoporous α-Fe2O3 material with pore diameter of 37±3nm, pore wall of 12±2nm, and orderly extension in three-dimensional direction. After SEM, TEM, XRD, N2 adsorption experiments and superconducting quantum interferometer to determine its large mesoporous structure and magnetic properties, it is a new type of ordered spherical large mesoporous α-Fe2O3 material. The material of the invention has the advantages of crystalline hole walls, special spherical large mesopore network and weak ferromagnetic properties, and can be used to prepare catalysts and sensors.

The invention relates to a dynamic crystallization technological method and device for a stannous chloride solution. The technological method comprises the following steps of: A, adding a stannous chloride concentrated solution into rotation equipment with a clamping sleeve; B, introducing a coolant into the clamping sleeve of the rotation equipment; C, starting the rotation equipment, controlling the rotation speed of the rotation equipment to be 2-5r / min, and controlling the temperature difference between the stannous chloride concentrated solution and the coolant in the whole crystallizingprocess to be 5-10 DEG C, and D, ending crystallization when the concentration temperature T of stannous chloride is not more than 10 DEG C, stopping introduction of the coolant and the rotation equipment, spinning to dry slurry crystal in the rotation equipment in a centrifuger, and packaging to obtain a product of the stannous chloride. In the invention, the traditional static crystallization mode of the stannous chloride solution is changed into a dynamic crystallization mode, and the advantages of improved production efficiency, high crystallization rate, uniform particle sizes of stannous chloride crystals and simplified crystallization production process are achieved.

The invention discloses a preparation method of premium-grade stannous chloride from low-tin waste residues. The invention comprises the following steps: preparing a reaction solution, introducing chlorine, settling, settling for a second time, filtrating, concentrating, freeze crystallization and solid-liquid separation, wherein the obtained solid is the premium-grade stannous chloride. According to the invention, low-tin waste residues produced in tin manufacturing process are used as raw materials, various indexes of the stannous chloride product are controlled through acidity, concentration and time, and multiple setting, filtering and concentrating are performed to remove impurities, so as to obtain premium-grade stannous chloride products. The preparation method disclosed by the invention is simple in process, low in cost and environmentally friendly, provides a new way for recycling of low-tin waste residues produced in a tin manufacturing process and satisfies requirements of circular economy.

The invention discloses a preparation method of stannous chloride dihydrate, which comprises the following steps: adding hydrochloric acid solution and metal tin into a reactor, controlling the reaction temperature at 40-70° C., and then dropping hydrogen peroxide solution to make Metal tin is dissolved, then metal tin is added to reduce Sn 4+ , then filter, adjust the pH value of the filtrate to 0.5-1.5, then concentrate the filtrate, and at the same time add metal tin to the filtrate to inhibit Sn 2+ Oxidize, when the density of the filtrate reaches 2.0~2.3g / mL, stop the concentration to obtain a concentrated solution; place the concentrated solution to crystallize at 0~5℃, separate the precipitated stannous chloride crystals, and dry to obtain chlorine dihydrate stannous. The preparation method of the invention has a simple process route, significantly improves the reaction rate, shortens the reaction time, and effectively reduces the temperature required for the reaction, does not need to use concentrated hydrochloric acid and chlorine in the reaction process, is environmentally friendly, and has high process safety. High purity.

The invention discloses a method for reducing lead content in stannous chloride. The method comprises the following steps of (1) dissolution: dissolving stannous chloride in water and preparing into a stannous chloride solution; (2) adjustment of a pH value: adjusting a pH value of the stannous chloride solution to 8-9 with an alkaline solution and heating to a temperature of 60-80 DEG C with stirring; (3) lead removal: dropwise adding a certain amount of a barium chloride-sodium carbonate solution into the stannous chloride solution with the pH value adjusted, controlling a reaction end point to a natural pH value, wherein a ratio of the amount of barium chloride to that of lead ions in stannous chloride is 20-60:1; and a ratio of the amount of substance of sodium carbonate to that of barium and lead ions is 13:12; and (4) solid-liquid separation: separating the stannous chloride solution with the lead removed by centrifugation and removing the precipitate. Lead content of high lead stannous chloride is reduced to below 0.005% through a barium carbonate co-precipitation method, thereby producing low lead stannous pyrophosphate. The lead content of the product can reach an industrial standard.

The present invention relates to a method for chlorination and dehydrogenation of ethane, comprising: mixing and reacting a low-melting-point metal chloride with C2H6, such that the low-melting-point metal chloride is reduced to a liquid-state low-melting-point metal, and the C2H6 is chlorinated and dehydrogenized to give a mixed gas containing HCl, C2H6, C2H4, C2H2 and C2H3Cl. In the method, the low-melting-point metal chloride is used as a raw material for chlorination and dehydrogenation, and the low-melting-point metal produced after the reaction is used as an intermediate medium. The method has the characteristics of simple process, low cost and high yield. Moreover, some acetylene and vinyl chloride can be produced as by-products at the same time when the ethylene is produced, by controlling the ratio of ethane to the chloride as desired in production.

The invention relates to a chlorine introducing method and a chlorine introducing device, in particular to a chlorine introducing method and a chlorine introducing device for producing stannous chloride by liquid chlorine. The method comprises the following steps of: introducing liquid chlorine into a coiled tube to be heated and gasified, introducing chlorine to a chlorine introducing tank for use, and heating the coiled tube by external hot water at the temperature of between 40 and 60 DEG C. The device comprises a liquid chlorine cylinder, the toiled tube, a heating water tank and a chlorine buffer tank, wherein the coiled tube is arranged in the heating water tank; an inlet of the coiled tube is communicated with the liquid chlorine cylinder, and an outlet of the coiled tube is communicated with the chlorine buffer tank; and the chlorine buffer tank is communicated to the chlorine introducing tank. In the method and the device, an operating mode of the natural gasification of the liquid chlorine is changed, and the liquid chlorine is introduced into the coiled tube in liquid mode and is heated by utilizing the coiled tube to accelerate the gasification speed of the liquid chlorine and improve the efficiency of a chlorination reaction in stannous chloride production; and the requirement of the production on the speed of a chlorine introducing reaction can be met only by opening one cylinder of liquid chlorine (one ton / cylinder), and the reliability of safety performance of the liquid chlorine during use is enhanced.