16 results about "Chloride levels" patented technology

The invention provides a water quality dynamic monitoring method and system based on underground water level, and relates to the technical field of water quality dynamic monitoring, the method comprises the following steps: calculating a correction coefficient based on historical data, seasonal change, rainfall and geological activity; adjusting the annual average change rate through the correction coefficient to obtain a final underground water level change trend; according to the final groundwater level change trend, setting a water quality abnormity monitoring point in the region where the groundwater level is abnormally changed, so as to obtain corresponding abnormal water quality data; according to the abnormal water quality data, regularly collecting water samples in the abnormal water quality data, detecting various indexes of the water samples, including chloride content, conductivity and total dissolved solids, and analyzing the change condition of the water quality so as to evaluate the water quality condition of the underground water. According to the method, the robustness to the data quality problem is improved, so that the actual condition of the underground water quality is reflected more accurately.

The present invention relates to a method for monitoring chloride content in porous materials, preferably in reinforced concrete structures, in which a voltammetric sensor comprising a metal electrode is used, characterised in that the electrode metal forms poorly soluble ionic compounds with chlorides and a potentiodynamic excitation signal is applied to the electrode, causing an oxidation-reduction process to take place that favours the formation of the poorly soluble ionic compounds. The formation of the poorly soluble ionic compounds produces a response in the form of electric current intensity that is related to the chloride content in the monitored material.

The present application belongs to the technical field of detection method, and particularly relates to a method for determining chlorides in reforming catalysts. The method comprises the following steps: burning the pretreated reforming catalyst sample to be determined to obtain a burned sample, adding water to extract the sample to obtain a chlorides extract, and determining the content of chlorides in the extract by silver nitrate titration. The temperature of the burning treatment is 600±25 DEG C, and the time is 1-3 hours. The present application discards the step of using magnesium chips / powder, which is an explosive hazardous material, in the traditional method, simplifies the sample pretreatment process, shortens the analysis time from 7 hours to 4 hours, eliminates the influence of wet base by calculating the mass fraction of alumina dry base and participating in the calculation of the content of chlorides, and improves the detection accuracy. The present application is safe, efficient, accurate and low in cost, and is suitable for monitoring chlorides in the whole life cycle of reforming catalysts in the petrochemical industry.

The present invention relates to a method for monitoring chloride content in porous materials, preferably in reinforced concrete structures, in which a voltammetric sensor comprising a metal electrode is used, characterised in that the electrode metal forms poorly soluble ionic compounds with chlorides and a potentiodynamic excitation signal is applied to the electrode, causing an oxidation-reduction process to take place that favours the formation of the poorly soluble ionic compounds. The formation of the poorly soluble ionic compounds produces a response in the form of electric current intensity that is related to the chloride content in the monitored material.

The invention relates to the technical field of boiler water treatment, in particular to a method for rapidly determining chloride in boiler water. The method comprises the following steps: step 1, preparing a reagent; step 2, calibrating a silver nitrate standard solution; step 3, determining the chloride in the boiler water; the method has the beneficial effects that the operation is simple and convenient, the time is saved, the reagent dosage is small, the cost is low, the result accuracy is high, the repeatability is good, the application range is wide, the sensitivity is adjustable, and the anti-interference capability is strong.

The invention discloses a method for detecting the chlorine content of a snow melting agent, belonging to the technical field of analytical chemistry. It is applicable to the detection of the chloride content in a snow melting agent mainly produced from sodium formate, and includes the following steps: Weigh a certain amount of the raw material sodium formate snow melting agent sample, place it in a muffle furnace for calcination treatment at a temperature above 500 °C. Utilizing the thermal decomposition characteristics of sodium formate, sodium formate is thermally decomposed into sodium carbonate and a small amount of carbon. Filter off the carbon generated during calcination with filter paper. Then, after adjusting the pH value to a certain acidic range (3.0 - 3.5) with nitric acid according to the mercury method, the sodium carbonate generated by the thermal decomposition of sodium formate volatilizes into carbon dioxide under acidic conditions, while chlorine exists in the form of chloride ions in the sample after calcination. Then, the chlorine content is titrated by the mercury nitrate method using diphenylcarbazone as an indicator, so as to quickly and accurately determine the chloride ion content in the test. This method is a rapid chloride ion content analysis method and is applicable to sodium formate snow melting agent products.

The present invention relates to a method for the reduction of the total alkali content of solid feedstocks employing mild temperature aqueous leaching in the presence of a leaching agent of formula XO and / or X(OH)? wherein X is an alkaline earth metal. The invention further relates to the solid material having reduced total alkali content obtainable from the method. The invention further relates to uses of the solid material, for example as a filler. The invention further relates to compositions comprising the solid material and a further material selected from the group consisting of asphalt, cement, geopolymers, polymers and combinations thereof. The invention further relates to a method for preparing concrete.

The disclosure relates to displacing corrosive salts in processing or co-processing renewable feedstocks. More specifically, the disclosure relates to displacing corrosive salts through the addition of choline-based hydroxides in the affected section of process unit that experience high levels of ammonia, amines, or chlorides and their use for reducing salt fouling and corrosion.

The present invention relates to mineral fibre products having a low water leachable chloride content which are suitable for use as non-corrosive thermal and / or acoustic insulation materials.

The invention discloses a multi-joint synchronous determination method for determining the chloride content of dinitrogen tetroxide, and relates to the technical field of determination of the chloride content of dinitrogen tetroxide. The multi-joint synchronous determination method comprises the steps of: preparing chlorine-free distilled water that meets the requirements of third-grade water → using the chlorine-free distilled water prepared in step S1 to prepare a standard working solution and other related pharmaceutical reagents, and making a standard working curve → preparing a sample gasification container, vacuumizing and sealing and cooling the screw-mouth gasification bottle → weighing the initial mass of the sample gasification container → injecting a quantitative sample into the sample gasification container → building a multi-joint determination group → connecting a nitrogen purge pipeline → performing synchronous nitrogen purge → merging and titrating the absorption liquid → determining the absorbance and chloride ion content. The multi-joint synchronous determination method of the present invention has the advantages of good data reproducibility, short time consumption for laboratory determination, and accurate chloride content determination data by carrying out multiple parallel determinations in the same time period.

The invention relates to a method for reducing the chloride content in lipids, in particular in oils and fats, characterised by the following steps: A providing a first lipid phase (1 or 5) having an increased chloride content; B adding (104) water (9), in particular demineralised water, and an organic acid (10) to the first lipid phase and keeping (105) this mixture (12) at a temperature of more than 140°C and less than 200°C and at a pressure of more than 10 bar and less than 16 bar over a dwell time of more than 2 h; and C separating (107) the mixture (12) into a second lipid phase (14) having a reduced chloride content and a water phase (13), wherein the method does not comprise the addition of a base and does not comprise the addition of a bleaching agent to the first lipid phase (5) or the second lipid phase (14) or the mixture (12). The invention also relates to a method for hydrolysing an oil and / or fat.

This disclosure pertains to a process and circuit for producing enhanced manganese-zinc filter cake compositions, and more specifically to a wash process and circuit that produces manganese concentrations of 36-45 wt. % and zinc concentrations of 15-17 wt. % while lowering chloride content to below 3 wt. %. The process and circuit involve sequential washing, drying, repulping, and dewatering of polymetallic filter cakes derived from saline feedstocks, facilitating effective downstream recovery of refined manganese and zinc products.

The disclosure relates to displacing corrosive salts in processing or co-processing renewable feedstocks. More specifically, the disclosure relates to displacing corrosive salts through the addition of choline-based hydroxides in the affected section of process unit that experience high levels of ammonia, amines, or chlorides and their use for reducing salt fouling and corrosion.

A process involves sequentially treating a plurality of lipid feedstocks comprising a set of lipid feedstocks each having a chloride content of at least about 2 ppm with a metal oxide catalyst on an oxide support under first treating conditions to produce respective treated streams of the set of lipid feedstocks having a chloride content less than 1 ppm until a given one of the respective treated streams has a chloride content greater than 1 ppm and the metal oxide catalyst is converted to a spent metal oxide catalyst, converting the spent metal oxide catalyst to a rejuvenated metal oxide catalyst, and treating one or more additional lipid feedstocks each having a chloride content of at least about 2 ppm with the rejuvenated metal oxide catalyst under second treating conditions to produce one or more respective treated streams each having a chloride content less than 1 ppm.

The invention relates to a mineral fiber product having a low water-leachable chloride content, which is suitable for use as a non-corrosive heat and / or sound insulating material.

A method for reducing the chloride content in lipids, especially in oils and fats, characterized by the following steps: A. Providing a first lipid phase (1 or 5) with increased chloride content B Addition (104) of water (9), in particular demineralized water, and an organic acid (10) to the first lipid phase and holding (105) this mixture (12) at a temperature of more than 140°C and less than 200°C and at a pressure of more than 10 bar and less than 16 bar for a residence time of more than 2h; and C Phase separation (107) of the mixture (12) into a second lipid phase (14) with reduced chloride content and an aqueous phase (13), wherein the process does not include the addition of an additional base or the addition of an additional bleaching agent to the first lipid phase (5) or the second lipid phase (14) or the mixture (12), and a process for the hydrolysis of an oil and / or fat.