59results about How to "Little corrosion" patented technology

The invention discloses a preparation method for a polycarboxylic acid series comb-shaped surface active agent, which comprises the following steps of: mixing two comonomers, an initiator, a chain transfer agent and a solvent under the protection of nitrogen, heating to a reacting temperature for polymerization to obtain an intermediate polymer; adding a graft compound, a catalytic agent and a dissolvant into the intermediate polymer, carrying out graft reaction at graft temperature, decompressing and removing part of solvent in a reaction system after reaction, and then precipitating the product with a precipitator; dissolving filter cakes with the solvent; precipitating the dissolved solution with the precipitator again, dissolving repeatedly, precipitating again and then refining, and finally decompressing and drying the product to the constant weight. The preparation method has the advantages of reasonable technology, simple operation, low preparation cost, mild reacting conditions and good product quality.

The invention relates to the technical field of rubber production, aiming to provide an improved nitrile rubber production process, which comprises polymerization, degassing and condensation. Raw materials including acrylonitrile, butadiene, desalinated and deoxidized water, condensed water and molecular weight regulators are fed into a polymerization position, convergence is carried out in a header pipe at the polymerization position, the converged mixture is pre-emulsified sequentially through a pipe pump and a pipe mixer, heat exchange is carried out through an ammonia-cooling heat exchanger for cooling, the cooled mixture, initiator emulsion and activator solution are sequentially fed into a plurality of reactors for polymerization to produce latex, the latex taken out of the reactorsand terminating defoamer solution are fed into a maturing reactor and are fully mixed when the rate of polymerization and conversion reaches 70 plus or minus 5 percent, and the mixture is then fed into a degassing tower to be degassed and into a condensation reactor for condensation. The problem of blockage of the heat exchanger can be avoided, the process is simple, the production process is stable and economical, the Mooney of rubber can be controlled easily, and the produced nitrile rubber has high quality.

The present invention provides coupling multistage apparatus with active carbon to purify waste gas, and the apparatus is used in desulfurizing, denitrating, dedusting, eliminating heavy metal and eliminating organic compound of waste gas. It consists of pre-purifying room, movable adsorption bed, purified gas outlet, material feeding mechanism, and discharging mechanism. Each of the material feeding mechanism and the discharging mechanism consists of material bin, material guide pipe and gas trap valve. The movable adsorption bed consists of one or several adsorption sections superposed sequentially, the material feeding mechanism is set on the top, the discharging mechanism is set in the bottom, and the pre-purifying room and the purified gas outlet are set in the side. The apparatus has compact structure, simple material distribution, complete functions, less resistance, high purifying effect, fully use of active carbon, long service life and low running cost.

The invention discloses a bright electrochromism technique for a cold-rolled steel strip. The technique is characterized by comprising the following steps: (1) electroplating a chromium layer, wherein the plating solution comprises the following components: 100-160 g/L of chromic anhydride, 1.5-3.0 g/L of NH4F, and 0.5-1.5 g/L of mixed rare-earth additive; the temperature of the plating solution is between 25 and 40 DEG C; the current density is between 25 and 70 A/dm<2>; and the electroplating time is between 10 and 20 s; and (2) electroplating and oxidizing the chromic layer, wherein the plating solution comprises the following components: 50-75 g/L of chromic anhydride, 0.8-2.5 g/L of NH4F, and 5-15 g/L of NaOH; the temperature of the plating solution is between 15 and 30 DEG C; the current density is between 8 and 20 A/dm<2>; and the electroplating time is between 2 and 6 s. In the invention, the performance advantages of the plating solution are fully used to obtain a uniform chromium-plated plate with bright plating layer and good quality, thus further improving the surface quality of the chromium-plated plate. Meanwhile, the method has the advantages of low corrosion to equipment, low temperature and effective reduction of energy consumption.

The invention relates to a pickling agent for stainless steel. According to percentage by weight, the pickling agent consists of the following components: 23 to 30 percent of sulfuric acid; 4 to 6 percent of nitric acid; 7 to 14 percent of hydrochloric acid; 0.1 to 0.3 percent of corrosion inhibitor; 0.13 to 0.25 percent of additive; and the balance of water. The mass concentrations of the used acids are as follows: 95.0 to 98.0 percent of sulfuric acid; 65.0 to 68.0 percent of nitric acid; and 36.0 to 38.0 percent of hydrochloric acid. The components are uniformly mixed according to proportion. The corrosion inhibitor is hexamethylene tetramine, the additive is the mixture of sodium dodecyl sulfate and isooctyl phenol polyoxyethylene, the percentage by weight of the sodium dodecyl sulfate is 0.08 to 0.15 percent, the percentage by weight of the isooctyl phenol polyoxyethylene is 0.05 to 0.1 percent, and the effect is better when the temperature of each acid is 60 DEG C to 80 DEG C. The pickling efficiency of the pickling agent for stainless steel is increased by four to five times, the pickled surface is bright and clean, and the pickling agent for stainless steel is particularly suitable for pickling the surfaces of stainless steel with high Cr, Ni and Mo alloy contents to remove ferric oxide scales.

The invention discloses a method for preparing silicon tetrafluoride. In the method, hydrated calcium fluosilicate is used as a raw material. The method is characterized by comprising the following steps of: preheating the hydrated calcium fluosilicate to 60-100 DEG C and drying under pressure of 0.05-0.5 MPaG and at the temperature of 100-220 DEG C for 60-150 minutes to obtain solid powdery calcium fluosilicate with moisture content of less than 1.5 percent by weight; feeding the calcium fluosilicate into an intermediate storage tank, then feeding into a cracking reactor, and pyrolyzing under the pressure of 0.05-0.5 MPaG and at the temperature of 220-420 DEG C for 60-150 minutes to obtain a silicon tetrafluoride rough product; and feeding the silicon tetrafluoride rough product into a sulfuric acid washing tower for washing to remove moisture so as to obtain a silicon tetrafluoride product with purity of 99 percent. The method has the advantages of simple technical process, capability of relieving corrosion to equipment, energy conservation, environmental friendliness, low cost and capability of improving purity of the silicon tetrafluoride.

The invention belongs to the technical field of organic synthesis, and in particular relates to a preparation method of O-3-chloro-2-propenylhydroxylamine. The preparation method of the O-3-chloro-2-propenylhydroxylamine comprises the following steps: uniformly stirring hydroxylamine salt, water and acetone, adding a sodium hydroxide solution, reacting at room temperature for 1 to 2 hours, then adding 1,3-dichloropropene and a phase transfer catalyst, heating in water bath, controlling the temperature at 60 to 90 DEG C, reacting for 5 to 10 hours, standing still for stratification, separatingand collecting an oil phase, extracting the oil phase 2 to 3 times with an extractant, drying extract liquid with anhydrous sodium sulfate, and removing a solvent under reduced pressure to obtain theO-3-chloro-2-propenylhydroxylamine. According to the preparation method of the O-3-chloro-2-propenylhydroxylamine provided by the invention, acetone oxime is firstly prepared by taking the hydroxylamine salt and acetone as raw materials, and then 1,3-dichloropropene and the phase transfer catalyst are added for a reaction to prepare the O-3-chloro-2-propenylhydroxylamine; the O-3-chloro-2-propenylhydroxylamine prepared with the preparation method has the purity of 99% or more than 99% and the yield of 88% or more than 88%, and the method is suitable for industrial production.

The invention discloses a novel method for producing potassium sulfate or sodium sulfate by potassium chloride or sodium chloride and sulfuric acid. According to the method, potassium chloride or sodium chloride and sulfuric acid react under heating to produce potassium sulfate or sodium sulfa and hydrogen chloride, potassium hydrogen sulfate or sodium hydrogen sulfate is degraded by an alcohol-water solution to produce potassium sulfate or sodium sulfate and sulfuric acid, a product is subjected to procedures such as centrifugal separation or centrifugal filtration, washing, drying and the like to obtain a finished product of potassium sulfate or sodium sulfate, and a mother solution is distilled and recovered to obtain an alcohol-water solution and sulfuric acid which are returned for recycling; and hydrogen chloride gas produced by the reaction is cooled, enters an absorption tower and is absorbed by water to prepare hydrochloric acid, or is cooled and purified for other application. When the method is used for preparing potassium sulfate or sodium sulfate, the reaction temperature is low, the equipment corrosion is weak, the reaction speed is high, short time is required, the product quality is stable, and a good comprehensive economic benefit is provided.

The invention discloses a paint remover for color-coated steel plates and a using method thereof. The paint remover comprises the following compositions in percentage by mass: 60 to 89 percent of alcamines compound, 10 to 35 percent of phenolic compound and 1 to 8 percent of corrosion inhibitor. The alcamines compound is one or a mixture of more of ethanolamine, diethanol amine, triethanolamine and isopropanolamine; the phenolic compound is one or a mixture of phenol and cresol; and the corrosion inhibitor is alcohol or carbohydrate, and is one or a mixture of more of sorbitol, xylitol, mannite, sucrose, glucose, maltose or dextrin. When the paint remover is used, the prepared paint remover is heated to a boiling state. Compared with the prior paint removers, the paint remover has good paint removal effect, is suitable for removing epoxy, polyester, high-performance polyester, silicon-modified polyester and polyurethane coatings, has high paint removal efficiency, shortens the paint removal time to about 60 seconds from the prior 2,400 seconds, and has slight corrosion to a substrate and the corrosion rate less than 0.2 percent.

The invention provides a low temperature removal method for COS with a relatively high concentration in gas. The low temperature removal method mainly comprises the following steps: process gas is maintained or heated to 30-80 DEG C and is introduced into hydrolysis desulfuration towers to be treated; the hydrolysis desulfuration towers are filled with a COS hydrolysis agent and an H2S oxidation desulfuration agent in a stacking or laminating manner; the H2S oxidation desulfuration agent can be subjected to sulfur-blowing thermal regeneration at 200-300 DEG C, and the performance of the COS hydrolysis agent is less or barely reduced after a thermal regeneration process; two or more hydrolysis desulfuration towers are arranged, can be connected in series or parallel for use and comprise vertical heating sleeves, and hydrolysis agent-desulfuration agent bed layers are arranged among the sleeves; and captured elemental sulfur is melted, gasified and blown out by the hydrolysis desulfuration towers during the thermal regeneration at 200-300 DEG C and is collected as sulfur by virtue of a regeneration condenser. The low temperature removal method has the beneficial effects that the desulfuration process is simple and reliable, the COS removal rate is easily maintained above 90% or even above 95%, the control is easy, the elasticity of processing quantity is high, and the method has strong adaptability to the degrees and fluctuation of contents of H2S and COS, and is safe and environment-friendly and low in operation cost.

The present invention relates to an LNG vehicle anti-freezing liquid, and provides a new special LNG vehicle anti-freezing liquid used for cold regions and having characteristics of excellent corrosion resistance, rust resistance, scale inhibition, high boiling point, and low freezing point. The LNG vehicle anti-freezing liquid is characterized by comprising, by weight, 35-55% of ethylene glycol, 5-30% of dimethyl sulfoxide, 0.1-0.3% of sodium molybdate, 0.1-0.4% of potassium dihydrogen phosphate, 0.1-0.6% of benzotriazole, 0.1-0.3% of phthalic acid, 0.1-0.3% of Isophthalic acid, 0.05-0.8% of mercapto benzothiazole, 0.1-0.3% of sodium nitrate, 0.05-0.2% of sodium benzoate, 0.1-0.5% of sodium hydroxide, 0.0005-0.0015% of fluorescein, and the balance of deionized water.

The invention relates to a reverse flotation technology of phosphate ore in an alkaline medium. Crushed phosphate ore is crushed and evenly mixed with industrial lime, the mixture enters a grinder and water is added to perform size mixing. Thus, the ore is composed of materials and enters a reverse flotation roughing groove after the ore receives monomer separation. A reverse flotation collecting agent C5-9 soap is used for performing size mixing to carry out reverse flotation roughing and obtain a roughed foam mainly comprising carbonate gangue minerals and one part of roughed phosphorus concentrate products. The roughed foam enters a reverse flotation selection groove, and the industrial lime and the reverse flotation collecting agent C5-9 soap are added for performing size mixing. Reverse flotation selection is carried out and a foam product is tailings, and is discharged and piled up. The other part of the obtained products in the groove are phosphorus concentrate. The concentrate is combined and receives concentration, filtering and drying and the final phosphorus concentrate is obtained. The reverse flotation technology has the advantages of being simple in technological process, easy to operate and control, easy to stably operate, high in separation efficiency, superior in technologic index, high in quality of the obtained phosphorus concentrate, high in yield coefficient, low in cost of final product phosphorus concentrate and the like.

The invention discloses a blast furnace cloth bag ash resource utilization process method, which uses blast furnace cloth bag ash as a raw material, and aims to realize resource recovery of chlorine,potassium and zinc and cyclic utilization of iron-containing and carbon-containing materials in a steel mill. The process method comprises a process step of recovering potassium and sodium by washingblast furnace cloth bag ash with water and crystallizing step by step, a process step of leaching zinc oxide with ammonia salt and a process step of recovering zinc oxide by evaporation, crystallization and calcination. According to the technological process, high-value utilization of the blast furnace cloth bag ash and cyclic utilization of the blast furnace cloth bag ash in the steel mill are achieved, energy conservation and emission reduction of iron and steel enterprises are promoted, and waste is turned into wealth.

The invention discloses a method for preparing 1,4-sorbitan. According to the method, sorbitol is used as a substrate, a molecule with strong polarity is used as a solvent, and 1,4-sorbitol is highly selectively prepared under the action of an acid salt catalyst. The method uses a combination of the special solvent and an acid salt, thereby realizing high selectivity of 1,4-sorbitol during dehydration of sorbitol.

The invention provides a CO gas preparation process. The CO gas preparation process mainly comprises the following steps: (1) preparing a raw gas from coke, CO2 and oxygen in a gas making furnace, recovering heat of the raw gas, and removing tar, dust impurities and strong acid ingredients; (2) maintaining or heating a process gas to 30-80 DEG C, removing majority of sulfide in a hydrolysis desulfurizing tower, wherein an organic sulfur hydrolyzing agent and an H2S oxidation desulfurizing agent are mixed or laminated in the tower; (3) separating CO2 from the process gas, removing the rest majority of sulfide at the same time to prepare the CO gas, and enabling the separated sulfur-containing CO2-rich gas to go back to the gas making furnace for recycling. The hydrolysis desulfurizing tower is provided with a vertical sleeve heating structure, a hydrolyzing agent-desulfurizing agent bed layer is arranged between sleeves; the hydrolysis desulfurizing tower melts, gasifies and blows out the captured elemental sulfur when the heat is regenerated at the temperature of 200-300 DEG C, and the elemental sulfur is collected by a regeneration condenser to obtain sulfur. The desulfurizing process of the process is simple and reliable, is easy to control, is large in elasticity of processing capacity, is strongly adaptive to high and low contents and fluctuation of H2S and COS, is safe and environment-friendly, and is low in operation cost.