19 results about "CHROMIUM COMPLEX" patented technology

The present invention provides: an ethylene oligomerization method in which an ethylene oligomer is produced by reacting a chromium complex and an organic aluminium compound with ethylene; and the ethylene oligomer thereof.

The application provides a method for efficiently and selectively removing iron and chromium from cobalt-nickel hydroxide raw materials, which can realize the synchronous and deep removal of iron and chromium impurities for high-iron and high-cobalt nickel hydroxide raw materials through the synergistic process of acid leaching, reduction pH adjustment, oxidation precipitation and solid-liquid separation, and the concentrations of iron and chromium in the purified nickel-cobalt liquid are both controlled below 10 mg / L, and the impurity removal precision meets the subsequent high-purity production requirements; the chromium-goethite co-precipitation crystal product is generated in situ in the reaction, and has excellent settling and filtering performance, solving the problems of difficult colloid precipitation and filtration and easy equipment blockage in the traditional method, and the process route is short and the reaction conditions are mild, which can effectively reduce the adsorption entrainment and co-precipitation loss of nickel and cobalt valuable metals, and while realizing the efficient and deep purification of iron and chromium, the excellent solid-liquid separation performance and high main metal recovery rate are also considered, and the method is suitable for the industrial purification treatment of high-iron and high-chromium complex cobalt-nickel raw materials.

Administration of certain chromium complexes in combination with a starch provide unexpected benefits regarding increasing amino acid absorption, protein synthesis, exercise tolerance, lean muscle mass, skeletal muscle hypertrophy, muscle power, muscle endurance, muscle strength, FSR, and decreasing delayed onset muscle soreness, muscle protein breakdown, and fat mass.

Preparations for storage-stable activated catalyst compositions comprising chromium complexes are disclosed herein. Oligomerization processes using the activated catalyst compositions produce a reduced amount of undesirable byproducts such as fouling solids, without a concomitant reduction in catalyst activity, yield, or selectivity.

The invention discloses a method for preparing syndiotactic polystyrene through transition metal catalysis. According to the method, an aryl ether-transition metal chromium compound is adopted to catalyze styrene to polymerize so as to prepare syndiotactic polystyrene. According to the preparation method of the compound, an aryl ether compound reacts with tetrahydrofuran chromium trichloride to obtain a chromium complex, then the chromium complex and aluminum alkyl form a catalytic system, bulk polymerization is performed in styrene to obtain syndiotactic polystyrene, and the syndiotactic polystyrene has the advantages of good stereoselectivity and high activity.

This invention relates to the field of organic synthesis technology, specifically to a method for synthesizing chiral β-amino alcohols. This method uses a chiral chromium complex as a catalyst to catalyze the reaction of aldehydes with imines to prepare chiral β-amino alcohols. The synthetic method provided by this invention uses simple and readily available reactants, is easy to operate, operates under mild conditions, and has good universality for the reaction substrates. It is applicable not only to alkyl aldehydes but also to aromatic aldehydes, exhibiting broad adaptability and practicality. Furthermore, the reaction products demonstrate excellent stereoselectivity, making it highly suitable for industrial production and application.

The invention provides an ethylene oligomerization method which comprises the following steps: premixing feed gas containing ethylene and hydrogen with an organic solvent to obtain a premix; the premix is in contact with a catalyst system a for a pre-reaction, and a pre-reactant is obtained; the catalyst system a is a bridged diphosphine chromium complex; the pre-reactant is in contact with a catalyst system b for a polymerization reaction, and a product containing alpha-olefin is obtained; the catalyst system b is an organic aluminum compound. According to the method disclosed by the invention, the activity and the product selectivity of the catalyst are improved by premixing the gas phase and the liquid phase and pre-activating the catalyst system, so that the utilization efficiency of the catalyst is improved, and the production cost is reduced.

The present invention discloses a method for preparing trans-olefins by chromium-catalyzed semi-hydrogenation of allenes. The method uses an allene compound as a raw material, a cyclic (alkyl)(amino)carbene chromium complex with a diphenylphosphine-substituted side arm as a catalyst, and hydrogen as a hydrogen source, and undergoes a full reaction to obtain the trans-olefin. The method has mild preparation conditions, low cost, a wide range of raw material sources, simple operation, good regio- and stereoselectivity, and can be carried out without the need for a directing group.

The invention relates to the technical field of energy storage of iron-chromium flow batteries, and provides an online monitoring method for aging of a negative electrode of an iron-chromium flow battery. The method comprises the following steps: designing a special negative electrode storage tank system to regularly collect trace electrolyte, detecting the content of chromium complex ions Cr (H2O) 6-nCln (3-n) + (n = 0-3) through an ultraviolet spectrum, and associating cycle times to construct an aging mathematical model to form an off-line monitoring database, thereby establishing an off-line monitoring mechanism; the method comprises the following steps: establishing a special online spectrum detection experiment platform, collecting chromium complex ion spectrum data in real time, analyzing a chromium complex ion evolution rule in a charging and discharging stage and a circulating process, analyzing a dynamic behavior and a reaction mechanism of a negative electrode chromium complex ion, and establishing a battery aging online monitoring mechanism; and based on the off-line detection result and a special experimental platform, performing correlation analysis on the chromium complex ion concentration distribution trend, the chromium complex ion concentration attenuation trend and the chromium complex ion formation mechanism, and quantitatively predicting the aging time point of the battery. According to the method, offline structure-activity relationship modeling and an online spectrum analysis technology are innovatively combined, the time hysteresis limitation of traditional offline detection is broken through, and in-situ, real-time and nondestructive monitoring of the iron-chromium flow battery negative electrode aging process is realized. Meanwhile, regeneration intervention on the iron-chromium flow battery at the most appropriate time point can be effectively guided, so that the electrolyte utilization rate is maximized, the service life of the system is prolonged, and the operation and maintenance economy is optimized.

The invention relates to the technical field of metal materials, in particular to surface treatment liquid for a hot-dip galvanized plate, a preparation method of the surface treatment liquid and a hot-dip galvanized coated plate. The raw materials comprise the following components in parts by weight on the basis of 100 parts of water: 5-30 parts of a trivalent chromium complex, 2-10 parts of a silane coupling agent, 10-20 parts of nano colloidal silicon dioxide and 3-15 parts of a film forming accelerant. According to the surface treatment liquid, the trivalent chromium complex is used as a main film forming substance, the nano colloidal silicon dioxide, the silane coupling agent and the accelerant are used as auxiliary materials, the specific surface area is increased through surface nano-scale gaps, and the bonding capacity of a surface coating with a phosphating film, a ceramic film and organic resin is improved under the assistance of the crosslinking effect of silane; therefore, the paint has excellent coating performance and direct coating performance.

This invention discloses a method for treating chromium-containing wastewater and its application in the preparation of electromagnetic shielding leather. The method utilizes a Fenton-like reaction with nano-zero-valent iron as a catalyst to destroy the difficult-to-remove chromium complex structure in the chromium-containing wastewater. Simultaneously, magnesium ions are added to prepare a magnesium-chromium-iron ternary hydrotalcite nanomaterial with tanning properties. This material is used as a tanning agent in the leather tanning process, imparting electromagnetic shielding properties to the finished leather. Furthermore, the electromagnetic shielding leather prepared by this invention meets the performance requirements of leather, exhibiting good physical and mechanical properties, good resistance to hot air aging and ultraviolet light aging, and high folding resistance. As a wearable electromagnetic shielding leather, it provides 18 dB electromagnetic shielding performance in the 8–12 GHz electromagnetic wave range while retaining the softness of leather. This invention provides a pathway for the treatment of chromium-containing wastewater and the preparation of electromagnetic shielding leather.

The application discloses a kind of redox processes for realizing the efficient recovery of chromium complex in Cr (III) -EDTA-containing wastewater, first, appropriate sodium percarbonate, formic acid is added to Cr (III) -EDTA-containing wastewater containing heavy metal chromium, and stirring is dissolved;Immediately, ozone is introduced into the mixed solution, and the oxidation of active species hydroxyl radical and carbonate radical, the reduction of active species carbon dioxide radical is generated by ozone / sodium percarbonate / formic acid advanced oxidation reduction method, which realizes the rapid complex breaking of chromium complex in wastewater, the reduction of hexavalent chromium, and the rapid removal of chromium ions in wastewater;At the same time, the organic ligand EDTA in wastewater is rapidly mineralized and decomposed under the oxidation of highly active free radicals.The application can realize the efficient complex breaking of chromium complex in Cr (III) -EDTA-containing wastewater and the synchronous removal of heavy metal chromium, and the heavy metal chromium is recycled, which has the advantages of economic efficiency, simple operation, easy engineering application, etc.

The present invention belongs to the technical field of tanning wastewater treatment, and discloses a method for determining the concentration of complexed chromium with different charge properties in tanning wastewater. The present invention addresses the problems of complex testing in the prior art and inaccurate determination of organic complexes of different molecular sizes containing chromium in tanning wastewater. The present invention uses a compounded anionic precipitant and a compounded cationic precipitant to precipitate anionic chromium complexes and cationic chromium complexes, respectively, and measures the chromium in the precipitates to obtain the concentrations of anionic chromium complexes and cationic chromium complexes in the wastewater, respectively. The neutral chromium complex concentration is then obtained by subtracting the total concentration of anionic chromium complexes and cationic chromium complexes from the total chromium concentration. The method has high accuracy, the molecular weight of the chromium complex has little effect on the detection method, and the operation is simple.

The invention discloses a self-activation catalyst for catalyzing ethylene tetramerization to prepare 1-octylene, a preparation method and an application method. The self-activation catalyst comprises an aryl ether-silicon bridged diphosphine ligand chromium complex [L1L2Cr] < + > and tetraphenyl boron anions paired with the aryl ether-silicon bridged diphosphine ligand chromium complex [L1L2Cr] < + >; the aryl ether-silicon bridged diphosphine ligand chromium complex [L1L2Cr] < + > has a structure as shown in a formula (1). When the self-activation catalyst is used, 1-octene can be obtained through self-activation catalysis of ethylene tetramerization in inert solvents such as methylcyclohexane without cocatalysts such as methylaluminoxane or aluminum alkyl, catalyst preparation steps are simplified, and reaction cost is reduced.

The invention belongs to the technical field of soft magnetic materials, and relates to a preparation method of a high-temperature-resistant insulated coated soft magnetic material. Comprising the following steps: reacting iron powder with a coupling agent; then adding an insulating coating layer precursor, adjusting the pH value, stirring and reacting, and generating a coating layer in situ; and carrying out heat treatment to obtain the high-temperature-resistant insulated coated soft magnetic material. The coupling agent is one or more of coupling agents such as aluminate, titanate, zirconate and a chromium complex; a precursor of the insulating coating layer is one or more of yttrium isopropoxide, tetrabutyl zirconate, aluminum isopropoxide, cerous nitrate, barium nitrate and magnesium nitrate. By designing the substrate-buffer transition interface-high-temperature-resistant oxide insulation coating layer high-temperature-resistant insulation multilayer composite material with the gradient thermal expansion coefficient, the resistivity of the magnetic powder can be improved, the magnetic loss can be reduced, and the high-temperature resistance can be greatly improved.

The present application relates to sludge remediation technical field, especially to a kind of removal method and leaching agent of heavy metal ion in desulfurization sludge.The present application provides a kind of heavy metal ion leaching agent in desulfurization sludge, including the following weight parts of raw material and water mixture: amino acid 3-5 parts;Inorganic salt 2-4 parts;And erythritol 1-2 parts.The leaching agent prepared by amino acid, inorganic salt and erythritol as raw material can repair mercury, chromium complex pollution desulfurization sludge, efficiently remove heavy metals in desulfurization sludge, reduce its secondary pollution risk, realize resource utilization.The leaching agent of the present application can be used at room temperature, without using other equipment to heat it.The preparation method of the present application is simple, raw material is easy to obtain, and the price is low, can remove mercury and chromium in mercury, chromium complex pollution desulfurization sludge Mercury element and chromium element, has good application prospect.

The invention discloses a binuclear chromium complex, an ethylene oligomerization catalyst system and application of the binuclear chromium complex and the ethylene oligomerization catalyst system. The binuclear chromium complex has a structure as shown in a formula I. A catalyst system containing the complex is high in catalytic activity, 1-hexene and 1-octene can be prepared with high selectivity, and the generation amount of polyethylene hindering process stability can be remarkably reduced while the activity of the catalyst is not reduced. Formula I.

A redox flow battery system comprising: an anolyte having chromium ions in solution, wherein at least a portion of the chromium ions form a chromium complex with at least one of: NH3, NH4 + , CO(NH2)2, SCN ‑ , or CS(NH2)2; a catholyte having iron ions in solution; a first half-cell comprising a first electrode in contact with the anolyte; a second half-cell comprising a second electrode in contact with the catholyte; and a first separator separating the first half-cell from the second half-cell. Other redox flow battery systems and methods of using redox flow battery systems are also disclosed.

Preparations for storage-stable activated catalyst compositions comprising chromium complexes are disclosed herein. Oligomerization processes using the activated catalyst compositions produce a reduced amount of undesirable byproducts such as fouling solids, without a concomitant reduction in catalyst activity, yield, or selectivity.