287results about "Alkali metal sulfite preparation" patented technology

The invention belongs to the technical field of chemical industry, in particular to a comprehensive treatment method of sulfur-containing flue gas. The comprehensive treatment method comprises the following steps: (a) dedusting through a bath tower; (b) desulphurizing through a desulphurizing and absorbing tower, wherein , dewatering the sulfur-containing flue gas after being treated by water washing and dedusting in the step (a). When the method is applied to purify the sulfur-containing flue gas, the efficiency of dedusting and removing sulfur dioxide and hydrogen sulfide reaches 100 percent, thus zero discharge of pollutants in exhaust smoke can be realized.

The invention discloses a soda wet desulphurization process and a soda wet desulphurization system for sintering flue gas, and solves the problems of severe pollution and the like in the prior art. Sodium carbonate serves as a desulfurizing agent, and a desulfurization by-product is sodium sulfite; and the process comprises the following steps of: (1) cooling and introducing sulfur-containing flue gas into a desulfurizing tower; and (2) purifying the sulfur-containing flue gas in the step (1) in the desulfurizing tower by taking solution of sodium carbonate or sodium hydroxide as an absorbent, demisting the purified flue gas through a demister and discharging. The process is simple in procedures, high in desulphurization efficiency, high in response speed and high in value of the desulfurization by-product, and saves energy and land.

The invention provides a recycling process for preparing taurine through ammonolysis of sodium hydroxyethanesulfonate. Through the process, solid wastes which are sodium sulfate and active carbon residues generated in the process of preparing taurine products through ammonolysis of sodium hydroxyethanesulfonate are comprehensively utilized and prepared into the solid wastes into sodium silicate products and recycled sodium hydrogen sulfite; acid-containing wastewater generated in a process of producing liquid wastes which are ammonia-containing wastewater and sodium hydrogen sulfite is neutralized and is subsequently used for producing sodium silicate; the unstructured gases generated in processes of producing, cooling and melting sodium silicate are introduced into an ammonolysis system through an induced draft fan for preparing ammonia absorption liquid or a hydroxylation reaction process. Through the process, the problem of pollution caused by three wastes in the production processof taurine is solved; zero emission of the process is achieved; the whole process is fundamentally recycled.

The invention relates to an environment-friendly production process of 2-naphthol. The environment-friendly production process of the 2-naphthol comprises the following steps: adding refined naphthalene into a sulfonation kettle, adding concentrated sulfuric acid, heating and performing sulfonation reaction, neutralizing a mixture by using alkali after the reaction is finished, crystallizing, filtering, drying, performing alkali fusion and diluting; neutralizing the diluted alkali fused sulfonation liquid by using sulfuric acid at 70 to 80 DEG C, controlling the pH to be 4 to 7, standing and layering, and separating out crude 2-naphthol; washing, dehydrating and rectifying the separated crude 2-naphthol to obtain refined 2-naphthol; and removing alkali from the separated waste liquid, neutralizing to serve as alkaline liquid, absorbing sulfur dioxide generated by neutralization by using a sodium carbonate aqueous solution to produce sodium sulfite, adjusting the pH value of the waste liquid after 2-sodium naphthalene sulfonate is separated to be 2+/-1, performing three-stage extraction by using an extracting agent, performing reverse extraction on the extracting liquid by using dilute alkali, diluting sulfonated liquid by using the reverse extraction liquid, oxidizing the water phase by using a Fenton reagent or KMnO4, decoloring by using active carbon, and recovering sodium sulfate by a mechanical vapor recompression (MVR) concentration technology. By the process provided by the invention, no waste water is discharged basically and the production cost is reduced.

Methods for sealing undesirable transverse fractures enlarged and/or created during lithological displacement of an underground water-soluble evaporite stratum by hydraulic pressure greater than overburden pressure at an evaporite/non-evaporite strata interface, comprising injecting and maintaining a sealing agent into these undesirable fractures to form a solidified matter in situ and ultimately seal them, while forming a main free surface at the interface suitable for initiating solution mining of the evaporite stratum. The solidified matter may be crystallized, precipitated, compacted, agglomerated, cross-linked, coagulated, water-swollen, and/or cemented matter, or may include a wall-building matter with the mineral on fracture faces. The sealing agent may comprise at least one component of the mineral and/or the non-evaporite. The evaporite stratum is preferably a trona stratum overlying an oil shale stratum. The sealing agent may comprise dissolved and/or solid trona, trona tailings particles, and/or water-swelling particles.

The invention discloses a method for preparing dispersant MF in combination with sodium sulfite. The method comprises the following steps: adding more than 95% of sulfuric acid to the methylnaphthalene raw material, charging sulfur trioxide to carry out sulfonation reaction thoroughly, heating, evacuating, and continuously reacting to reach the total acidity of the solution of 22-27%; absorbing sulfur dioxide gas generated by sulfonation reaction with alkali liquor for preparing sodium sulfite; and regulating condensation acidity to 14% to 20% with water, adding formaldehyde aqueous solution for condensation, diluting, and regulating pH to 7 with alkali to obtain dispersant MF. In the method, lime is not required to neutralize so that solid waste such as calcium sulfate can not be generated and the dispersant MF reaches Chinese quality standard GB9294-88. Meanwhile, sulfur oxide waste gas is reasonably reutilized, with the characteristic of low energy consumption; and is a clean environment friendly production process.

The invention discloses a catalytic crackingflue gas dust removal, desulfurization and sodium sulfite recovery process which adopts a dust removal system, a desulfurization system and a sodium sulfiterecovery system. The dust removal system is a bag type dust collector 1. The desulfurization system is a desulfurization tower 3, the desulfurization tower 3 comprises a spraying layer 4, a demister5 and a chimney 6 are arranged above the spraying layer 4. The bag type dust collector 1 is connected with the desulfurization tower 3 through a booster fan 2. The sodium sulfite recovery system comprises a crystallizer 7, a thickening device 8 and a centrifugal machine 10, wherein the thickening device 8 is arranged before the centrifugal machine 10, the crystallizer 7, the thickening device 8 and the centrifugal machine 10 are sequentially connected through pipes, and a fluidized-bed dryer 11 and a cyclone separator 12 are sequentially connected behind the centrifugal machine 10. The thickening device 8 is also connected with an overflow buffer tank 9, and the overflow buffer tank 9 is also connected with the desulfurization tower 3. The process is high in sodium sulfite recovery rate while meeting current environmental protection standard, obtained products are high in purity, almost no wastewater is discharged, and the catalytic crackingflue gas dust removal, desulfurization and sodium sulfite recovery process has the advantages of being low in operation cost, obvious in economic and environmental benefit and the like.

A process for continuous production of ammonium thiosulphate, (NH4)2S2O3 (ATS) from NH3, H2S and SO2 comprising steps of: (a) partial condensation in a partial condenser 4 of a first gaseous or partial liquid feed stream comprising H2O, H2S and NH3 with a molar H2S:NH3 ratio <0.4; (b) passing the aqueous condensate comprising NH4HS and NH3 from the partial condenser 4 to a reactor 9 in which said condensate is contacted with a third feed gas stream 7 comprising H2S and with an aqueous solution 10 comprising NH4HSO3 and (NH4)2SO3 under formation of an aqueous solution of (NH4) 2S2O3; (c) passing the gas stream comprising NH3 and H2S from the partial condenser 4 to a mixing device 13 in which said gas stream is completely dissolved in the water drained off from the aerosol filter 25; (d) passing a second feed gas stream 20 comprising approximately 2/3 mole SO2 per mole of NH3 contained in the first feed stream to a SO2 absorber 21 and the aerosol filter 25; (e) passing the aqueous solution produced in mixing device 13 to the SO2 absorber 21; (f) passing the off gas from the absorber 21 to the aerosol filter 25 and (g) adding to the aerosol filter 25 a balance amount of water required for obtaining approximately 40-65 wt % (NH4)2S2O3 in the aqueous of solution of (NH4)2S2O3 being withdrawn from the reactor 9.

The invention provides a preparation device of sodium pyrosulfite and anhydrous sodium sulphite, comprising a roasting system, a sodium pyrosulfite preparation system and an anhydrous sodium sulphite preparation system, wherein the sodium pyrosulfite preparation system and the anhydrous sodium sulphite preparation system are respectively connected with the roasting system. A preparation method comprises the following steps: first carrying out fluidized roasting on pyrite powder to let sulfur in the powder be oxidized by the air to SO2 and to produce SO2 as a gas, and carrying out a range of processes such as dedusting purification and alkali absorption on the furnace gas to produce sodium pyrosulfite and anhydrous sodium sulphite. The main component of the roasting slag is iron oxide, and is directly sold to building materials factories or cement mills. According to the invention, the utilization rate of pyrite resource is raised, the production cost is simultaneously reduced, and the advantage of environmental protection is achieved.

A dehalogenating agent is disclosed that is useful for treating aqueous media. The agent contains at least one sulfite salt, such as sodium sulfite. In the agent, the salt is in mixture with a lubricant, an excipient and a saccharide binder. Then a dry, blended mixture of the agent components is directly compressed to form tablets not only of desirable strength and hardness, but also of desirably controlled dissolution rate.

The process of preparing anhydrous sodium sulfite with industrially co-produced anhydrous sodium sulfate includes: introducing SO2 gas produced through burning sulfur in air into the acidifying unit for reaction with suspension inside the acidifying unit, adding industrially co-produced anhydrous sodium sulfate in certain amount, filtering out calcium sulfate precipitate to obtain sodium sulfite, adding certain amount of sodium carbonate via stirring to obtain sodium sulfite solution, centrifugally separating to eliminate impurity to obtain refined sodium sulfite solution, vacuum evaporation to concentrate, crystallization, separating mother liquid and vacuum drying to obtain anhydrous sodium sulfite product, and reusing the condensated water and mother liquid. The process utilizes the industrially co-produced anhydrous sodium sulfate effectively, and is environment friendly.

The invention provides a method for producing anhydrous Na2SO3 by using waste mother liquor generated in the production process of soda ash dense. The method is characterized by comprising the following steps of: performing primary treatment on alkali-containing waste mother liquor; generating sulfur dioxide and washing with water; absorbing sulfur dioxide by the alkali-containing waste mother liquor which is subjected to the primary treatment; adding alkali to adjust pH value to be 8 to 14 at high temperature; standing, filter-pressing and decolorizing, and removing residues; performing vacuum concentration and evaporation on a saturated sodium sulfite solution from which the residues are removed; and performing centrifugal dewatering on sodium sulfite crystal substances and drying; and detecting the dried anhydrous sodium sulfite, metering, packaging and putting in storage. The alkali-containing waste mother liquor is used as a raw material, and the waste mother liquor absorbs sulfur dioxide so as to prepare the anhydrous sodium sulfite; therefore, the alkali-containing waste mother liquor can be purified completely; the whole process is simple, low in investment, low in energy consumption, and easy to popularize and apply, and has obvious social and economic benefits; and wastes and secondary pollution can be avoided.

The present invention provides a new liquid fertilizer comprised of potassium sulfite and potassium bisulfite, with neutral to slightly alkaline pH, relatively lower salt index and potentially lower phytotoxicity damage compared to other sources of potassium and sulfur products applied in equal amounts as a starter fertilizer. More specifically, the present invention further relates to methods for fertilizing using a composition of potassium sulfite and potassium bisulfite, particularly as a starter fertilizer, in-furrow fertilizer, side dress fertilizer, and for foliar, broadcast, soil injection and fertigation applications. The fertilizer composition is comprised primarily of potassium sulfite (with the fertilizer grade of 0-0-23-8S).

An apparatus and process produces salts by an electrodialysis operation. The basic electrodialysis apparatus is a cell having a number of compartments separated by membranes. A DC source is connected to drive a current through a feed stream passing through the cell which splits the salt stream into an acid and a base. The incoming feed may be nanofiltered to remove divalent metal. The base loop may be in communication with an ion exchange column packed with a material that removes multivalent cations. Depending upon the material being processed and the desired end result either or both the nanofiltration and the ion exchanged column may be used in the apparatus.

The invention relates to a method for producing sodium metabisulfite or sodium sulphite. The method comprises the following steps of: firstly calcining the gypsum and coke serving as raw materials in a rotary kiln to prepare gas sulphur dioxide; then generating the gas sulphur dioxide subjected to purification treatment into a suspension liquid of the sodium metabisulfite or sodium sulphate, controlling the pH value of the suspension liquid to be 3.8-4.1, carrying out centrifugal dehydration on the suspension liquid by using a centrifugal machine, then drying and separating to obtain the finished product sodium metabisulfite or sodium sulphite, and absorbing tail gases by using a tail gas washing tower; and in the preparation process of the gas sulphur dioxide, controlling the content of O2 of the tail gases in the rotary kiln to be 0.05%-1.0% and the content of CO to be less than 0.4% according to the weight percentage content. The purities of sodium metabisulfite and sodium sulphite product prepared by using the method can respectively reach up to 97.5%-98.5wt% and more than 93wt% and is completely in line with national standards. According to the method, the route of raw materials for producing the sodium metabisulfite is widened.

A kind of technological method of using arsenic-containing industrial alkali slag to absorb SO2 flue gas, remove arsenic and purify to produce sodium sulfite product. After treatment with p-phenylenediamine, press filter to obtain arsenic-containing leaching lye for later use, pump the clear liquid into the spray desulfurization tower to absorb SO2 flue gas, reduce the pH value of the absorption solution to 6.2-6.4, and then add arsenic-containing leaching lye After adjusting the pH value of the clear liquid to 10.5-11.5, adding polyferric sulfate aqueous solution for arsenic precipitation, pressure filtration for liquid-solid separation, clear liquid crystallization after concentration and evaporation, and drying after separating the mother liquor to obtain sodium sulfite products with a mass concentration ≥ 96% . This method starts with industrialized stable production, increases the content of sodium sulfite products as much as possible, optimizes the technical process and parameter selection, and has achieved obvious technological progress. Based on the annual output of 20,000 tons of alkali slag in the country, it can increase economic benefits by about 35 million The total amount of arsenic that can be removed and harmlessly treated is As 6%×20000=1200 tons/year, and the desulfurization is 4250 tons/year, resulting in huge environmental benefits.

The invention belongs to the field of atmospheric pollution governance, relates to a method for desulfurization and dust removal of flue gas, and particularly relates to a low-energy-consumption method for desulphurization and dust removal of the flue gas and recycling of sodium sulfite. The technical problems to be solved comprise the problems of high investment, large energy consumption, large waste liquid emission load, large water resource consumption, high operating cost of per unit of sulfur dioxide and the like existing in a conventional fuel gas desulfurization technology, and the invention provides a process route comprising the steps of taking a sodium sulfite/sodium hydrogen sulfite mixed solution as a desulfurization agent, washing and purifying the sulfur-containing flue gas, and recycling the anhydrous sodium sulfite product.

The invention discloses a production process of sodium pyrosulfite. The production process comprises the following steps: combusting fluidized sulfur powder in the air to generate mixed SO2 gas; washing out sulfur steam and SO3 in the mixed gas by using clear water; reacting the purified SO2 gas with a pure alkali solution to obtain a sodium pyrosulfite oversaturated solution; centrifugally separating the oversaturated solution by using a centrifuging machine; recycling the centrifuged mother solution; drying the centrifuged solid by using hot air to obtain a sodium pyrosulfite product; and packing and warehousing the product to obtain commodity sodium pyrosulfite. The product produced by using the production process is high in yield, the product purity is high, and the raw material utilization ratio is high; and moreover, the process flow is simple, the mother solution and energy are recycled repeatedly, the energy consumption in a production process is lowered greatly, the aims of saving energy and reducing emission are fulfilled, the production cost is lowered, and the economical benefit is remarkably increased.