69 results about "Equivalent concentration" patented technology

The invention discloses a method for producing modified white carbon black. The method comprises the following steps of: A, adding water glass, water and a dispersing agent according to a proportion, stirring and heating; B, simultaneously dropwise adding concentrated sulfuric acid and 20 to 30-baume degree water glass into reaction equipment and determining that equivalent concentration of excessive Na2O of the water glass in reaction solution is 0.03 to 0.3; C, adding an activating agent and a modifying agent for reaction to generate modified hydrated silicon dioxide with amorphous structure; D, adding an acid to regulate the reaction solution; E, cooling, aging, filtering, washing, homogenizing and pulping; and F, drying and collecting with cyclone. In the method, the white carbon black is precipitated and prepared by using one-step process of dilute water glass and concentrated sulfuric acid, so that the production flow is simplified, the utilization rate of the equipment is improved, synchronous organic implementation of liquid-phase preparation technology and modification technology of the white carbon black is realized, and the dispersibility of project products and rubber reinforcement are improved; and by controlling the reaction process by the Na2O measuring method instead of a pH method, the control accuracy in the reaction process is improved, and stable and reliable product quality is guaranteed.

The invention relates to online monitoring of flue gas, in particular to a calibration method and an implementation device for an ultraviolet differential flue gas concentration measurement system. The invention aims to provide the high-precision calibration method and the high-precision calibration device and simply and quickly complete calibration for the flue gas concentration measurement system. The invention adopts the technical proposal that: all sample cell packs are communicated and well sealed; standard concentration gas with fixed pressure is led in; after the gas is fully uniformly, sample cells are placed into a light path, thereby ultraviolet light can penetrate gas to be measured in the sample cells; the concentration of the gas to be measured with different equivalent concentrations can be obtained by placing the sample cells with different lengths; spectral curves are acquired and recorded under each concentration; the gas concentration is calculated according to the ultraviolet difference method; and least square fit of theoretical values and actual measured values of the equivalent gas concentrations obtained by utilization of standard concentrations and the lengths of the sample cells is performed through calibration software, and then calibrated concentration measuring coefficients are obtained. The calibration method and the implementation device are mainly applied to online monitoring of the flue gas.

The present invention relates to a cracking catalyst. Its composition contains (by wt%) 10%-50% of high rare earth ultrastable Y-type molecular sieve, 10%-40% of aluminium oxide adhesive and 10%-70% of clay. The preparation method of described high rare earth ultrastable Y-type molecular sieve includes the following steps: fully mixing ultrastable Y-type zeolite and acid solution whose equivalent concentration is 0.01N-2N according to the solid-liquid ratio of 20:4 at temperature range of 20deg.C-100deg.C, stirring them for 10min-300min, then washing, filtering, adding rare earth salt solution to make rare earth ion exchange, after the exchange washing, filtering and drying so as to obtain the high rare earth ultrastable Y-type molecutar sieve.

The present invention provides a process that can utilize aqueous sugar-bearing sources, including food commodities, food-processing by-products, fermentation by-products, or other industrial by-products, in the making of a liquid animal feed ingredient that contains sugar and carboxylic acid salt. In general, the process according to the invention comprises mixing: (a) an aqueous sugar-bearing source characterized by having: (i) a total monosaccharide and disaccharide sugar content of at least 5.0 weight percent based on the amount of the aqueous sugar-bearing source, and more preferably, an invert sugar content of at least 5.0 weight percent based on the amount of the aqueous sugar-bearing source; and (ii) a water content of at least 10 weight percent; (b) carboxylic acid having in the range of 1-8 carbon atoms; and (c) inorganic base; wherein the step of mixing the carboxylic acid and the inorganic base is at least partially performed in the presence of the aqueous sugar-bearing source, and wherein the proportions of the aqueous sugar-bearing source, carboxylic acid, and inorganic base are selected such that: (i) the total monosaccharide and disaccharide sugar concentration is at least 3.0 weight percent of the resulting mixture; (ii) the carboxylic acid equivalent concentration is at least 0.5 equivalent per 1,000 g of the resulting mixture; (iii) the pH of the resulting mixture is at least 3.5; and (iv) the viscosity of the resulting mixture is less than about 40,000 centipoise when measured at about room temperature and at about standard atmospheric pressure. The inorganic base at least partially neutralizes the carboxylic acid to form the carboxylic acid salt in the resulting animal feed ingredient and the aqueous sugar-bearing source absorbs at least some of the heat of neutralization.

A storage and shipping system for glyphosate herbicide is provided, comprising a container having a capacity of about 0.1 to about 100,000 liters or more, substantially filled with an aqueous solution of glyphosate, predominantly in the form of one or a mixture of the potassium and monoethanolammonium salts thereof, the solution having a glyphosate acid equivalent concentration of at least about 30 percent by weight. The storage and shipping system, by virtue of the relatively high specific gravity of the glyphosate salt solution, holds a greater weight of glyphosate than a system comprising an identical container substantially filled with an aqueous solution of the isopropylammonium salt of glyphosate at the same glyphosate concentration by weight. Alternatively, the container of the storage and shipping system can be smaller than that of a container holding the same weight of glyphosate in the form of the isopropylammonium salt. Further, a larger number of such smaller containers can be shipped in a given enclosed volume, thereby enabling the shipment of a larger weight of glyphosate in a single consignment.

Desalination is carried out by a hybrid ion exchange-nanofiltration process in which ion exchange is followed by pressure-driven nanofiltration. Monovalent ions of sodium and chloride of saline water are exchanged for equivalent concentrations of poly-valent ions (for example, sodium ions for magnesium ions or chloride ions for sulfate ions) when passed through ion exchangers in the form of those poly-valent ions. The resultant solution has a lower osmotic pressure than the initial solution containing monovalent sodium and chloride ions, and requires less transmembrane pressure for membrane desalination compared to traditional reverse osmosis. The concentrated reject stream from the membrane process is used as regenerant for the exhausted ion exchanger, which has been converted to monovalent anionic or cationic form.

The invention discloses an ecological risk evaluating method of an urban system. The method comprises the following steps of: (S1) acquiring year-by-year data information of an urban area to be researched and determining a pollutant used as a chemical risk source; (S2) establishing a class III multi-media fugacity / equivalent concentration model; (S3) estimating according to the year-by-year data information to obtain a model parameter and substituting the model parameter into the model to obtain a calculating value of pollutant concentration; (S4) obtaining a predicted value of the model parameter in a researched time segment according to the obtained year-by-year model parameter; (S5) substituting the model parameter predicted value into the model to obtain a pollutant concentration predicted value; and (S6) acquiring a predicted value of urban ecological risks brought by chemical pollutions. The ecological risk evaluating method of an urban system obtains the predicted values of time sequences and space distribution based on past and current ecological risk change conditions, serves for an implementation process of urban ecological planning and is helpful to formulating and implementing more scientific and reasonable urban ecological planning.

The present application is directed to systems methods and methods for monitoring phenanthrene equivalent concentrations in an aqueous stream. One or more sources of electromagnetic radiation at different wavelengths may be directed into a sample of the aqueous stream and the resulting fluorescence at various wavelengths is detected. The detected fluorescence is then used to determine the phenanthrene equivalent concentration.

Increasing the molecular length of xanthan polymer makes a higher viscosity xanthan composition. Xanthan with higher specific viscosity characteristics provides more viscosity at equivalent concentration in food, industrial and oilfield applications. Methods for increasing the viscosity of xanthan include inducing particular key genes and increasing copy number of particular key genes.

A method for crystallizing L-beta-mercaptoalanine high-purity crystal is carried out by preparing L-beta-mercaptoalanine cathode electrolytic bath liquid by electrolyzing L-cystine, decompress concentrating for electrolytic bath liquid at 70-80 degree, reaching L-beta-mercaptoalanine equivalent concentration in concentrate to 6-8N, reaching hydrochloric acid equivalent concentration 1.2-2 times of L-beta-mercaptoalanine, agitating at 1-6 degree, lowering temperature to 8-12 degree, laying aside and crystallizing. The crystal grain size is coarse, uniform, transparent, net and diamond, the length is 4-5 mm, and width and thickness are 2-3 mm. It has 5 times re-crystallization and better purity.

A cracking catalyst comprises a rare earth ultra-stable Y-zeolite and a matrix, the matrix comprises a silicon oxide binder, the rare earth ultra-stable Y-zeolite is obtained by the method including the following steps: the ultra-stable Y-zeolite and the acid solution with the equivalent concentration of 0.01N to 2N are mixed within the temperature range of 20 DEG C to 100 DEG C in the liquid-solid weight ratio of 4 to 20; washing and filtration are carried out after stirring for 10 minutes to 300 minutes; rare earth salt solution is then added for carrying out the rare earth ion exchange; and washing, filtration and drying are carried out after the exchange. The catalyst of the invention is used for catalytic cracking of heavy oil, the conversion rate is high, the yield of gasoline is high and the coke yield is low.

The invention belongs to the technical field of atmospheric environment measurement, and concretely relates to a multi-chamber serial connection gas sample cell with a built-in reflecting mirror. Thesample cell comprises a sample cell main body and the quartz reflecting mirror; the sample cell main body comprises a first sample cell and at least one second sample cell which are serially connected, and the two types of sample cells are separated by a quartz window; and the quartz reflecting mirror is placed in the first sample cell, the reflecting mirror faces the middle quartz window, and a quartz window is arranged at the front end of the at least one second sample cell. The first sample cell and the at least one second sample cell are serially uses an introduced sample gas in order to achieve multiple equivalent concentrations of a single concentration gas; and the quartz reflecting mirror is arranged in the sample cell to make lights reflected in the sample cell, so light path adjustment is simplified. The gas sample cell overcomes the shortcoming that existing sample cells only can calibrate one equivalent concentration of one concentration sample gas, improves the use efficiency and the working efficiency of the sample gas, reduces the error in the gas calibration process, is convenient to operate and is easy to manufacture.