672 results about "Acid concentration" patented technology

A system is disclosed for hydrogen generation based on hydrolysis of solid chemical hydrides with the capability of controlled startup and stop characteristics wherein regulation of acid concentration, acid feed rate, or a combination of both control the rate of hydrogen generation. The system comprises a first chamber for storing a solid chemical hydride and a second chamber for storing an acidic reagent. The solid chemical hydride is a solid metal borohydride having the general formula MBH₄, where M is selected from the group consisting of alkali metal cations, alkaline earth metal cations, aluminum cation, zinc cation, and ammonium cation. The acidic reagent may comprise inorganic acids such as the mineral acids hydrochloric acid, sulfuric acid, and phosphoric acid, and organic acids such as acetic acid, formic acid, maleic acid, citric acid, and tartaric acid, or mixtures thereof.

The invention discloses a method for decaling phosphoric acid concentration heat exchanger, namely a technique of adopting a washing-liquor composed of thin fluosilicic acid solution, organic phosphonic acid sustained-releasing agent and film forming matter and firstly washing the heat exchanger with water and then washing out the foul with the washing liquor. In the washing liquor, the fluosilicic acid is a 5%-20% thin acid, the organic phosphonic acid sustained-releasing agent includes amino tri- sub-methylene phosphoric acid, hydroxyl sub-ethyl di-phosphoric acid and hydroxyl-l, 1-subethyl di-phosphoric acid; the film forming matter includes nitrous phenylhydroxylamine ammonium salt and wuluotuopin as well as sodium molybdate. As using, adding in surface active agent alkyl sulphonate. The invention can make high efficiency and thorough decaling the graphite heat exchanger and simultaneously effectively control the corrosion of the washing liquor to the equipment and as compared with traditional washing methods, the invention improves the productivity of the equipment.

Hop beta acids are improved with respect to their antibacterial properties, especially their anti-Listeria properties. Enhancement in this regard is especially useful for the treatment of food products which are susceptible to bacterial contamination. This can be especially important when the hop beta acids are to be used in surface application onto the food products. The hop beta acids are rendered more effective by combining them with a food grade acid, a potassium ion source, and an optional antioxidant in a carrier solvent such as, for example, a food grade alcohols or a food grade glycol. The improved hop beta acid compositions of this invention provide increase stability, higher hop beta acid concentrations, and/or higher anti-Listeria activities.

The invention discloses a method for preparing titanium pigment from novel-process-flow titanium slag and titanium concentrated ore through mixed acidolysis, which belongs to the technical field of titanium pigment production. The method of the invention comprises the following steps: adding the novel-process-flow titanium slag and concentrated sulfuric acid into the titanium concentrated ore; regulating the acid concentration to 82 to 86 percent; raising the temperature to 130 to 150 DEG C; curing solid mixtures generated in the reaction for 1.5 to 3 h at 160 to 220 DEG C; adding water for leaching; carrying out solid-liquid separation, and removing impurities; carrying out freezing crystallization concentration on obtained clear titanium liquid to obtain concentrated titanium liquid; and carrying out hydrolysis, washing, rinsing; salt treatment, calcination and post treatment on the concentrated titanium liquid to obtain the titanium pigment. When the technical scheme of the invention is adopted, the novel-process-flow titanium slag which has low price but is not applicable to the titanium pigment production is applied to the titanium pigment production on the basis of not changing the existing process and equipment for producing titanium pigment from titanium concentrated ore, titanium pigment products with good pigment performance are prepared, waste materials are changed into useful materials, and in addition, the consumption of reducing ferrous powder is saved, so the production cost is reduced.

A method is provided for post-processing lithographically patterned resists to reduce surface defects on a patterned resist feature. The method includes providing a substrate with a patterned resist feature containing surface defects with convex and concave regions, applying an acid solution to the patterned resist feature to form a surface acid layer on the patterned resist feature, heat-treating the patterned resist feature, where the heat-treating causes acid concentration in the convex regions and acid dispersion in the concave regions. The method further includes exposing the heat-treated patterned resist feature to a developing solution to preferentially remove resist material from the convex regions and form a trimmed patterned resist feature with reduced surface defects. According to one embodiment, the method further includes repeating the applying, heat-treating, and exposing at least once to further trim and reduce surface defects on the trimmed patterned resist feature.

The invention provides a method for recrystallizing and purifying desulphurized gypsum, which mainly comprises the four steps of acid-washing, dissolution, crystallization and washing, and specifically comprises the following steps of: removing impurities, reacted with acids, in the desulphurized gypsum by the aid-washing, dissolving calcium sulphate in the desulphurized gypsum into the acid solution at a relatively higher temperature by utilizing the characteristic that the solubility of the calcium sulphate in the specific acid solution is remarkably changed with the temperature, performing solid-liquid separation to remove undissolved solid-phase impurities at the high temperature, performing cooling recrystallization and the solid-liquid separation on a liquid phase at a relatively lower temperature, and washing and drying a filter cake to obtain high-purity gypsum, wherein the liquid phase in the dissolution and recrystallization processes can be reused. Through the method provided by the invention, the gypsum with relatively higher purity and whiteness can be prepared by selecting a proper solid-to-liquid ratio, proper temperatures and proper acid concentration and performing dissolution and crystallization for a certain time, and the performance of the desulphurized gypsum is remarkably improved.

The invention relates to a waste acid concentration multistage treatment method which comprises the following steps of: heating 20-22% waste acid by a preheater, evaporating by a one-effect evaporation heater and a double-effect evaporation heater, cooling by a cooler and crystallizing by a crystallizer; heating by a triple-effect evaporation heater and separating by a separator to obtain 65% concentrated acid. The secondary steam part is used as a heat source part of the next stage heater and is condensed by spraying cooling water, wherein the one-effect evaporation heater and the double-effect evaporation heater are falling film graphite tube array evaporation heaters; the triple-effect evaporation heater is a floating head tube array graphite heat exchange. The water evaporation capability of the method is increased from 2.5 tons to 10 tons, and the stage number is 3 or more. A large amount of steam and cooling water is saved, and the pollution to the environment is reduced. The heat exchange area of equipment is reduced by 30%, and materials are saved and manufacturing cost is reduced correspondingly. The heat of steam is fully utilized, more than 35% of steam is saved, and more than 30% of cooling water can be saved. The condensed water part of the steam is used as the hear source part of the preheater and is recycled for other uses.

The present invention refers to wearability vinylon and preparation method and application. It is composed of 100 part by weight polyvinyl alcohol with degree of polymerization 1500-3000, alcoholysis degree 92-99 mol per cent, additive 2-6 part by weight, water 400-900 part by weight, adding to dissolution kettle, at temperature 90-120 degree centigrade, pressure 0.02-0.17 MPa, dissolution 6-10 hr, through filtering and debubbling to make spinning raw liquor; utilizing wet spinning, drawing-heat treating, aldehyde concentration 20-80 g/L, acid concentration 20-300 g/L, temperature 50-90 degree centigrade acetalation processing, to make wearability vinylon with linear density being 1.0-10 dtex, rupture strength 7-11 CN/dtex, elongation at break 10-30 per cent, softening temperature in water 110-120 degree centigrade, number of crimp 3.0-5.0 piece /25 mm. Said short fiber pure spinning or mixed spinning with other fiber to make different count yarn, fabric used as tent gabe, Knapsack or training garment etc.

The invention provides a method for extracting lithium from salt lake brine. The method comprises the following steps: 1) preparing extract organic phases which comprise a composite extracting agent and a diluent, wherein the composite extracting agent is prepared by mixing tributyl phosphate with N,N-bis(2-ethylhexyl)-3-butanone acetamide according to a volume percent ratio of 50% to 50%; the diluent is sulfonated kerosene; 2) preparing an extract water phase which is an LiCl-MgCl2-H2O system; 3) adding HCl and FeCl3.6H2O to the extract water phase, wherein the ratio of amount of substances of iron and lithium is controlled to be 1.3 to 1, the acid concentration is 0.5mol/L, and the lithium concentration is 1-3g/L; 4) standing after fully mixing the extract water phase obtained in the step 3) with the extract organic phases obtained in the step 1) in a volume ratio of 1 to 2, and then separating a liquid phase. By adopting the method, the problems that the corrosivity of high-concentration tributyl phosphate towards extraction equipment is stronger and the dissolution loss of the extracting agent in water is serious in long-term operation are solved, and the lithium extraction efficiency of the prior art is achieved. The extraction method is simple and reliable to operate.

The invention relates to a method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process, which comprises the following steps of: bamboo material preparation, in which bamboo is made into bamboo sheets and bamboo threads, the bamboo sheets and threads are washed to remove impurities and dust; pretreatment, which is for removing more organic and nonorganic impurities, and in which the loss of pentosan is less than 2 percent; prehydrolysis, which is carried out at an acid concentration of sulphuric acid and hydrochloric acid of 0.1 to 10.0 weight percent, a temperature of between 80 and 14 DEG C and a liquor ratio of 1:4-15 for 30 to 400 minutes; and alkaline process. The method has the advantages that: the performance index of the bamboo dissolving pulp meets the requirements of viscose fibre pulp and the like; the improved prehydrolysis process allows the major part of pentosan in the bamboo to be hydrolyzed; the hydrolysate can be used as a raw material for xylose, xylitol, L-Arabinitol, ethanol and other products; the improved prehydrolysis process lays a good foundation for cooking and improving the reaction performance of the dissolving pulp; little production cost is added, the treatment load and cost of waste are reduced with the recovery of the products of the prehydrolysis, and the comprehensive cost is the lowest; and the comprehensive utilization of the components of biomass is realized during the pulping process of the dissolving pump.

A substrate for an information recording medium, which has high heat resistance and high acid resistance and is formed of a glass having a glass transition temperature (Tg) of 600° C. or higher and having an etching rate of 0.1 μm/minute or less with regard to a hydrosilicofluoric acid aqueous solution that is maintained at a temperature of 45° C. and has a hydrosilicofluoric acid concentration of 1.72% by weight, and an information recording medium having an information recording layer formed on the above substrate.

Disclosed is a method which recovers pure acid from the waste acid contains metallic ion and reproduces alkaline, and belongs to the environmental protection field. The process steps include that: (a) the waste acid solution with the acid concentration 10%-40% is processed with the first level diffusion dialysis; (b) the residue after the step a is processed with the second level diffusion dialysis; the volume ratio of the first level (or the second level) waste acid (or the first level diffusion residue) in the first level (or the second level) diffusion dialysis groove residue and the acid recovery chamber collected solution is 1:0.5-1:3.0; the flow rate of the waste acid (or the first level diffusion residue) is enabled to be 0.2-0.6L/h; the flow rate of the acid recovery chamber collected solution is 0.1-1.8L/h; (c) the second residue after the step b is processed with neutralization and deposition; (d) the neutralized filtrate after the solid-liquid separation-filtration is fed to the three compartment electrodialysis groove middle chamber, the electrodialysis is processed for 1-3h under the voltage 5-15V to obtain the reproduction acid and reproduction alkaline. The method which recovers pure acid from the waste acid contains metallic ion and reproduces alkaline has the advantages of high acid recovery rate, low production cost and energy-consumption, less film pollution, saving water, reducing discharge and no secondary pollution.

The invention discloses a regeneration method for a heavy oil hydro-treating catalyst. The regeneration method comprises the following steps of: performing dry distillation, washing with an acidic solution, and performing roasting coke removal treatment, wherein the dry distillation temperature is 300 to 550 DEG C, the acidic solution is a hydrochloric acid-containing solution, the weight ratio of the washing acid to the catalyst is 5 to 50L/Kg, and the acid concentration is 0.1 to 0.5mol/L. Compared with the prior art, the regeneration method has the advantage of well recovering the service performance of an inactivated catalyst.

This invention relates to extend the benefits of using hypochlorite compounds such as sodium hypochlorite to clean and disinfect articles while reducing or eliminating the side effects of treating an article with a strong oxidant material. The invention relates to a single step process involving mixing of precursor compositions of a suitable hypohalite or hypohalous acid with a solution of a reducing agent. Optionally a buffer may be present in either or both precursor compositions, such that at time of use such active hypohalous acid concentration in the resulting aqueous mixture remains at a sufficient activity level to effect one or more desired benefits against a target substrate for a desired period of time. The oxidant is substantially consumed by reaction with the reducing agent after the time needed for achieving the desired benefit has passed.

An alcohol concentration detecting device for a vehicle includes an alcohol sensor to detect alcohol component contained in an expiration of an occupant of the vehicle, a gas sensor to detect gas components other than the alcohol component contained in the expiration, and a controller to calculate alcohol concentration based on detection value of the alcohol sensor. The controller corrects the calculated alcohol concentration based on detection value of the gas sensor. The alcohol sensor and the gas sensor are configured to further detect a state of air in a passenger compartment of the vehicle.

The invention discloses a stable peroxyacetic acid disinfectant which relates to a disinfectant. The peroxyacetic acid disinfectant comprises the following raw materials in percentage by mass: 27-39 percent of hydrogen peroxide, 22-36 percent of acetic acid, 0.01-2 percent of compound stabilizer, 0.01-2 percent of surfactant and the balance of water. In the prepared peroxyacetic acid disinfectant, the concentration of the peroxyacetic acid is 15-20 g/100g, the concentration of the hydrogen peroxide is 20-30 g/100g, and the concentration of the acetic acid is 10-20 g/100g. The peroxyacetic acid disinfectant has the characteristics of high peroxyacetic acid concentration, high stability, good disinfection and sterilization effects, simple production process, safety and the like.

A method using various raw materials containing nickel to prepare electrolytic nickel is provided. The materials containing nickel obtained from various nickel smelting and nickel renewable resource recovery processes are taken as the raw materials, sulfate system electrolyte solution is adopted, pure metallic nickel is prepared by the method of insoluble anode diaphragm electrolysis; the acidity of the anolyte is adjusted by the direct neutralization method or the solvent extraction method in the electrolytic process, nickel ion is supplied, acid concentration is lowered, thereby changing into eligible catholyte, returning to the electrolytic process realizes the balance of nickel ion and acid concentration in the whole electrolytic process; the electrolyte system adopts falcial sulphate liquor, nickel sulphate, sodium sulphate, and boric acid are prepared into the catholyte which mainly contains: boric acid 1-25g/L, sodium sulphate70-150g/L, and nickel sulphate 50-120g/L, vitriol is added to adjust the pH value to about 2.0-2.5; the acidity of the anolyte is adjusted by the direct neutralization method or the solvent extraction method.

The present invention discloses an ultrasonic cleaning tank comprising an ultrasonic transducer and a stainless steel reservoir; the reservoir wall thickness is between 1to 3 mm and the internal surface of the reservoir is blasted with grits; the internal surface of the reservoir with certain harshness is sprayed with a polytetrafluoroethylene layer and the polytetrafluoroethylene layer thickness is between 0.1 to 0.4 mm; the processing method is that the internal surface of the stainless steel reservoir is blasted with grits to make the surface harsh; after the internal surface is cleaned, at least twice polytetrafluoroethylene static sprayings are implemented on the internal surface of the reservoir; the coating of the cleaning tank surface is dense and the coating is closely combined with the reservoir to prevent the reservoir from being corroded by strong acid and have excellent abrasion resistant function; the ultrasonic conduction rate is high and the acid concentration of the cleaning liquid can be reduced which reduces the environmental pollution and effectively prolongs the service life of the cleaning device.

A pickling line control device (24) calculates forecast acid amounts consumed at pickling by pickling liquids stored in the third tank (11c) and the final tank (11d) of a continuous pickling device (10), determines respective acid liquid supply amounts to the third and final tanks (11c, 11d), and allows the an acid liquid supply system (12) to supply acid liquid. The acid concentrations of pickling liquids respectively stored in the acid liquid-supplied third and final tanks (11c, 11d) are continuously measured by acid concentration continuous measuring devices (13c, 13d), and acid liquid is supplied from the acid liquid supply system (12) to the third and final tanks (11c, 11d) based on the continuously measured values of measured acid concentrations so that the acid concentrations of pickling liquids stored in the third and final tanks (11c, 11d) match respective target values. Thereby, it is possible to increase, while restricting the acid concentration of pickling liquid from the final pickling tank to up to 12%, the acid concentrations of pickling liquids stored in the other pickling tanks.