132results about "Bicarbonate preparation" patented technology

In a process to produce sodium carbonate and/or sodium bicarbonate from an ore mineral comprising sodium bicarbonate, a production solution comprising sodium carbonate is introduced into less basic compartments of an electrodialyser comprising alternating less basic and more basic adjacent compartments separated from each other by cationic membranes, the more basic compartments being delimited by anionic faces of bipolar membranes on one side and by the cationic membranes on the other side; a solution comprising sodium hydroxide is produced into the more basic compartments by combination of sodium ions flux crossing the cationic membrane and hydroxyl ions flux crossing the anionic face of the bipolar membranes, and is then extracted from the electrodialyser to be used as a reaction solution; the reaction solution is put into contact with the mineral ore to form a solution comprising sodium carbonate; and the solution comprising sodium carbonate is divided into a part used as the production solution and a remaining part used as a produced solution.

A method of producing additional sodium bicarbonate having a high degree of purity and obtaining a net reduction in effluent waste water, as compared to prior processes, when starting from trona ore is disclosed. The process entails utilizing the waste-water effluent stream from the conversion of trona ore to sodium carbonate as the feed for the conversion of sodium carbonate to sodium bicarbonate.

A method of producing sodium bicarbonate having a high degree of purity and obtaining a net reduction in effluent waste water, as compared to prior processes, when starting from trona ore is disclosed. The process entails utilizing the waste-water effluent stream from the conversion of trona ore to sodium carbonate as the feed for the conversion of sodium carbonate to sodium bicarbonate.

The invention discloses a process for preparing super activated carbon from nut shell carbon and a waste liquid activation treatment method of the process, belonging to the field of biochemical engineering and energy materials. The process comprises the following steps: soaking nut shell carbon which is subjected to pre-washing and thermal treatment A into an oxidization substance in a vacuum reaction kettle; performing thermal treatment B on the nut shell carbon soaked into the oxidization substance, and soaking into an alkali aquo-complex activating agent in the vacuum reaction kettle; in inert gas or reductive atmosphere, heating the nut shell carbon to perform thermal treatment C so as to obtain activated nut shell carbon; adding water to leach and separate the activated nut shell carbon so as to obtain alkali activated mother liquor A and a solid; adding water into the solid for leaching again so as to obtain carbonate mother liquor B and activated carbon slurry; performing multi-stage washing and acidization treatment on the activated carbon slurry, washing with water, and separating so as to obtain a crude activated carbon product; and performing thermal treatment D of different stages on the crude activated carbon product, thereby obtaining an activated carbon product. The super activated carbon with high yield and good properties can be prepared, and meanwhile useful byproducts such as bicarbonate and hydrated silica can be prepared.

To provide a process for easily obtaining an alkali metal hydrogencarbonate having a large crystal particle size in good yield by an industrially convenient installation by a crystallization method from an aqueous solution. A process for producing an alkali metal hydrogencarbonate, which comprises reacting an aqueous solution containing alkali metal ions with carbon dioxide in a prescribed crystallizer to precipitate crystals of an alkali metal hydrogencarbonate, characterized in that a part of a slurry containing the above crystals in the above aqueous solution, is withdrawn from the above crystallizer and, after a part of the above crystals is dissolved, returned to the above crystallizer.

The invention discloses a method for clean method for producing sodium bicarbonate and sulphur by means of Glauber salt wet method for reducing the emission of CO2 and avoiding the discharge of wastewater, which comprises the following steps: A, sodium sulphide preparing process, B, hot carbonatation process, C, sulphur preparing process, D, cold carbonization process, and E, mother liquor purifying. Glauber salt coal is reduced and calcined into sodium sulphide, and the sodium sulphide solution is heated and carbonized into a mixed solution with the soda as the main component by use of sodium bicarbonate, then the mixed solution is cold-carbonated by CO2 to separate out NaHCO3 crystal, which is dried to finally obtain the soda in conformity with relevant standard. The production method has the advantages of simple process, environmental friendliness, no pollution, full circulation of the mother liquor, and no wastewater discharged.

This invention describes a process for a complete sequestration of carbon (CO₂) from Municipal Solid Waste (MSW) to energy plants which produce Refuse Derived Fuel and the associated exhaust gases. The described process results in production of energy from the waste and disposal of the MSW with zero carbon emission.

The invention relates to a method for preparing medicinal sterile sodium bicarbonate raw powder, which comprises the following steps: (1) subjecting industrial sodium carbonate serving as a raw material to purification, dissolution in water, decarburization and membrane filtration; (2) introducing industrial carbon dioxide gas subjected to membrane treatment into solution of sterile sodium bicarbonate to carry out acidification, and controlling parameters such as flow rate, reaction time, terminal pH value and stirring speed; (3) adding ethanol liquid subjected to membrane treatment into solution in which reaction is finished to allow sodium bicarbonate crystals to precipitate gradually, adjusting stirring speed, and controlling crystallization time to allow the crystallization to be completed fully; and (4) filtering the solution by a crystal filter to obtain the product, and drying the product by using a vibratory drying machine to obtain a finished product that meets medicinal standards.

The invention discloses a resourceful treatment method of waste salt. The method comprises the following steps: S1, a waste salt pretreatment stage: removing insoluble impurities in waste salt, and separating and enriching water-soluble ions to obtain mixed hybrid salt mainly comprising sodium sulfate and sodium chloride; S2, a double decomposition stage: carrying out double decomposition reaction on the mixed hybrid salt; S3, filtering a metathesis mixed solution obtained by the metathesis reaction, and collecting filter cake obtained by filtering to enter a sodium bicarbonate preparation stage; and S4, an ammonium salt preparation stage. The waste salt mainly containing sodium chloride and sodium sulfate is subjected to resourceful treatment, industrial sodium bicarbonate and ammonium salt products are obtained, so that resourceful treatment of the waste salt is greatly improved. The method is simple in process and low in cost, the utilization rate of the waste salt is 84%-89%, the purity of the prepared product sodium bicarbonate is 94%-96%, and the nitrogen content (on a dry basis) in the ammonium salt is greater than or equal to 23.8%.

The invention generally relates to system and method for recovering sodium bicarbonate from a solid waste, and more particularly to a method and system for recovering sodium bicarbonate from fly ash of a coal fired plant collected downstream of an injection process for pollution reduction from the industrial process.

The invention provides a method and a device for producing baking soda, wherein sodium bicarbonate is added to a dissolving tank to prepare raw material slurry containing a sodium bicarbonate solid, the raw material slurry enters an ammonia still, high temperature solution A1 containing high-concentration sodium bicarbonate and low-concentration sodium carbonate flowing out of the ammonia still fully enters a mixer, and is mixed with low temperature solution A2 containing low concentration sodium bicarbonate in the mixer, a clear liquid at the top of the mixer enters a cooler or a flasher to cool down to obtain the low temperature solution A2, and the low temperature solution (namely A2) enters the mixer; bottom crystal slurry of the mixer is subjected to solid-liquid separation to obtainsolid sodium bicarbonate crystal and filtrate; the solid sodium bicarbonate crystal is sent to a drying process to obtain the target product baking soda; the filtrate is sent to a filtrate barrel, thefiltrate of the filtrate barrel is sent to a carbonization tower, the sodium carbonate in the filtrate and carbon dioxide contained in an industrial gas are carbonized in the carbonization tower, anda reaction liquid flowing out from the carbonization tower is sent to the dissolution tank to complete the circulation of the liquid. The method has the advantages that the process flow is short, theenergy consumption is small, and the operation cost is low.

The invention provides carbonation and crystallization equipment, application thereof and a preparation method for sodium bicarbonate, and relates to the field of chemical equipment. The carbonation and crystallization equipment comprises a crystallization barrel and a carbonization reactor, the carbonization reactor is arranged outside the crystallization barrel and is communicated with the crystallization barrel, and reaction final liquid in the carbonization reactor can enter the crystallization barrel for crystallization treatment. The carbonation nad crystallization equipment has the advantages that the technical problems that an existing carbonation tower is low in production efficiency and large in energy loss due to cleaning can be solved, and the technical effects that the operation efficiency and the production efficiency of the equipment are improved, and the energy consumption is reduced can be achieved.

The invention relates to a preparation method of large-particle heavy baking soda. The method comprises the following steps: performing a carbonization reaction on a sodium carbonate solution or a mixed solution of sodium carbonate and sodium bicarbonate and CO2, so as to obtain a mixture; and adding sodium carbonate and/or a solid and/or a solution of a mixture of sodium carbonate and sodium bicarbonate into the obtained mixture for crystallization and solid-liquid separation, so as to obtain the large-particle heavy baking soda. The sodium carbonate solution or the mixed solution of sodium carbonate and sodium bicarbonate can be prepared from heavy alkali in soda production. The preparation method is suitable for different baking soda manufacturing plants; and the baking soda is high inyield and large in particle size.

The invention discloses a cleaning process in external cooling gas-transforming alkali preparation. At least two external cooling type carbonizing towers are paralleled into a set; each carbonizing tower is connected with a set of external coolers; after working for days, each carbonizing tower is cleaned alternately, and the connected external coolers are also cleaned at the same time. In the cleaning period, other carbonating towers but the one being cleaned continue the alkali preparing work; in cleaning, ammonia mother liquid 2 is introduced into the cleaned tower, and at the same time, one part of carbonized exhaust coming out from the alkali preparing towers is also introduced into the cleaned tower after being pressurized to accelerate dissolution of scars in the cleaned tower; the exhaust coming out from the cleaned tower is combined into the other part of the carbonized exhaust coming out from the alkali preparing towers and, used as raw material decarburizing gas for synthetic ammonia production, is sent with the ammonia mother liquid 2 discharged out of the cleaned tower into the alkali preparing towers for the alkali preparation. The cleaning process of the invention has no sewage discharge and does not pollute the environment; in addition, two to six or even more towers can be paralleled into a set for the alkali preparation, thereby significantly improving the working efficiency of the towers and reducing the adverse effect caused to the production by cleaning operation.

The invention discloses a recycling method of a byproduct saline during preparation of hydrazine hydrate by using a urea method. The method includes adding excess CO2 into a coarse hydrazine solution, and keeping the negative pressure of a steel cylinder containing the CO2 to be 100pa to 150pa and the flow to be 0.5-0.8mol/L; stirring the mixture continuously for 0.5 hour when the negative pressure in the steel cylinder is zero; freezing and crystallizing the solution through general freezing brine, and controlling the temperature in a range from 2 DEG C to 6 DEG C and the freezing time to be 2 hours; performing cold filtering to obtain filter residues, drying the filter residues in a vacuum drying oven for 4 hours, and keeping the temperature of the drying oven to be 35 DEG C to 45 DEG C; adding urea into the filtrate obtained through cold filtering, adding sulfuric acids to regulate the pH to be 3 to 4, controlling the temperature to be 106 DEG C to 120 DEG C, and reacting the mixture for 2 hours; and feeding chlorine into a biurea reaction still to perform oxidation to obtain the resultant ADC foaming agents, wherein the filtrate is sent to an electrolytic tank. The recycling method of byproduct saline during preparation of hydrazine hydrate by using the urea method has the advantages that the byproduct sodium salt of the hydrazine hydrate is fully recycled, the cost is reduced, and the method is a green chemical process.

The invention discloses a production method of high-purity non-caking ammonium-free potassium bicarbonate, which comprises the following steps: dissolving leftovers with the content of above 98% in a production process of industrial potassium carbonate or potassium carbonate into deionized purified water (or vapor condensation recycled water), or a cleaning solution obtain in Step 3), or potassium bicarbonate mother liquor obtained in Step 5); removing oil with an adsorbent, performing decoloration refining with a de-coloring agent and performing a carbonation reaction on refined potassium carbonate solution, so that potassium carbonate is translated into potassium bicarbonate; separating potassium bicarbonate out by crystallization and purifying potassium bicarbonate, so as to obtain a potassium bicarbonate wet product; and drying the potassium bicarbonate wet product with high-temperature airflow, so as to obtain a potassium bicarbonate finished product.