2551 results about "Water chlorination" patented technology

A portable water treatment system includes at least one sub-system to treat water including a flocculation system, a chlorination system, and a bio-sand filter system. The water treatment system may include multiple sub-systems for treating water that feed into one another. The sand filter system may include a mini bio-sand filter, a foam filter, or a pressed block filter. The flocculation system may include a tank bottom that urges settling particles toward a sump and a ladle that removes settled particles. A manual pump or siphon may be included in the water treatment system.

The invention discloses a method for harmless disposal and recycling of aluminum ash. The method comprises steps of raw material water immersion nitrogen and chlorine removal, calcination fluorine removal, alkali fusion sintering, sintering material dissolving-out and purifying impurity removal. Aluminum ash generated in metal aluminum smelting process is employed as a raw material, after metal aluminum is recycled through secondary processing, nitrides are removed through water immersion, fluorides are removed through calcinations, alkali fusion sintering is carried out, the sintering materials are dissolved out, impurities are removed through a sodium aluminate solution, the processed aluminum ash is employed as a raw material for producing sand-shaped aluminum oxide. Ammonia gas generated in the aluminum ash harmless disposal process can be employed as an ammonium production raw material, a chlorination liquid generated can be employed as a chlorate production raw material, and silicon fluoride gas generated in the calcination process is absorbed by an aqueous solution. The method is simple and practical, environmental protection benefits are high, the production efficiency is high, the device investment is low, and energy consumption is low. Harmless and recycling disposal of hazardous wastes can be achieved. The obtained product can be applied in practical production.

The invention discloses a preparation method of paraphthaloyl chloride with high purity, which takes terephthalic acid and a chlorinating agent as materials to prepare the paraphthaloyl chloride with high purity by reflux reaction and distillating separation for one time under the condition of catalysts, and then the method conducts treatment on byproducts to obtain additional products which can be utilized. The method has the advantages of being capable of improving the yield of the product to over 90-95 percent, realizing closed cycle for tail gas absorption and utilization, having no pollution to environment and being capable of achieving over 99.95 percent of product purity.

The invention relates to a method for preparing multifunctional titanium dioxide pigment with a chlorination method, which comprises the following steps of: blending a titanium dioxide primary product into titanium dioxide slurry by adopting a chlorination method and adjusting a pH value between 9.0 and 11.0; adding a phosphate dispersing agent and carrying out grinding treatment; removing a grinding medium from the slurry and heating; adding a water-soluble silicate solution for curing; adjusting the pH value of the slurry for forming amorphous silica and curing for forming a first coating layer; cooling the slurry to 50-70 DEG C; adding a sodium metaaluminate solution and curing; adjusting the pH value of the slurry between 8.0 and 9.0, curing and forming an amorphous alumina coating layer on the first coating layer; adding an aluminum salt solution, maintaining the pH of the slurry between 7.0 and 9.0 and curing; adjusting the pH value of the slurry between 6.0 and 7.0 and curing; and washing the slurry with deionized water till the conductivity of a filter cake is larger than 15,000 ohm.cm, and carrying out drying and steaming pulverizing treatment to obtain a finished product. The multifunctional titanium dioxide pigment prepared with the method has higher weather resistance, whiteness, covering capability, opacity and dispersibility and excellent processing performance in the fields of coating, plastics, papermaking, and the like.

Process for the manufacture of 1,2-dichloroethane (DCE) starting from a stream of ethane which is subjected to a catalytic oxydehydrogenation (ODH) thus producing a gas mixture containing ethylene which is then dried and conveyed to a chlorination reactor supplied with a flow of chlorine so that at least 10% of the ethylene is converted to DCE. The stream of products derived from the chlorination reactor is then conveyed to an oxychlorination reactor in which the majority of the balance of ethylene is converted to DCE.

The invention discloses a method for recycling an iron and zinc containing waste hydrochloric acid solution. The method specifically comprises the following steps that 1, acid consuming and reducing are carried out, acidity is made to meet the requirement, and ferric iron in waste acid is reduced into ferrous iron; 2, zinc and iron are extracted and separated, and a ferrous chloride solution is obtained; 3, an organic phase transfers zinc into a strip liquor through reverse extraction, and the organic phase is extracted for reuse; and 4, the strip liquor is subjected to subsection kalizing treatment, zinc hydroxide is obtained, and the strip liquor is reused. According to the method, iron and zinc are separated through different extracting capacities of N235 to the ferrous iron and zinc, and therefore pure ferrous chloride liquid and zinc hydroxide solids are obtained. Ferrous chloride can be oxidized into ferric trichloride, and ferrous chloride and ferric trichloride both can be used as a water treatment agent; and zinc hydroxide can be used as a raw material for preparing zinc oxide or zinc chloride.

The invention provides a method for preparing special titanium dioxide pigment for plastic sectional materials by a chlorination method, which comprises the following steps that: the chlorination method is adopted for preparing titanium dioxide primary products into slurry, and the pH value of the slurry is regulated to 4.0 to 5.0; phosphate dispersing agents are added; grinding treatment is carried out, then, grinding media is removed, and the temperature is raised; water-soluble silicate solution is added, the pH value of the slurry is maintained between 3.5 and 4.5, amorphous silicon oxide is formed, curing is carried out, and a first covering layer is formed; the pH value of the slurry is regulated to 6.0 to 7.0, curing is carried out, and a second covering layer is formed; aluminum salt solution is added, the pH value is controlled between 7.0 and 9.0, curing is carried out, a third covering layer is formed, the pH value of the slurry is regulated to 6.0 to 7.0, and curing is carried out; the slurry is washed by de-ionized water until the conductivity of filter cake is higher than 15000 ohm*cm, and then, drying and air powder treatment are carried out; modified polysiloxane is added in the air powder process, and a fourth organic covering layer is formed; and materials are recovered through a bag filter. The titanium dioxide pigment prepared by the method provided by the invention has the advantages of high weatherability, high shielding capability, high non-transparency and excellent processing performance in the field of plastic sectional materials.

The invention relates to electrolytic plating assistant for hot dip galvanizing of a steel wire. Electrolytic plating assistant comprises the following components: 30-220 g/L of zinc chloride, 0-150 g/L of potassium chloride, 0-150 g/L of sodium chloride, 2-90 g/L of ammonium chloride, 0-100 g/L of boric acid, 0-70 g/L of acetic acid, 1-25 g/L of sodium fluoride, 2-50 g/L of cerium chloride, 0-50 g/L of potassium fluozirconate, 0-50 g/L of methanol, 0.5-20 g/L of hydrogen peroxide and the balance of water. The electrolytic plating assisting method comprises the following steps: washing with alkali, removing oil, washing with water, washing with acid to remove rust, washing with water, activating with weak acid, electrolyzing to assist plating, drying, and purifying the electrolytic plating assistant. The method can reduce the generation of AlCl3, prevent skip plating and reduce the generation of smoke dust. The electrolytic plating assistant has the characteristic of relatively high melting point, and thus, can increase the drying temperature and shorten the drying time. The dried plating assistant has the characteristics of low brittleness, high compatibility with electrogalvanizing, and low tendency to shedding.

The scrubbed waste water treating and resource recovering process includes introducing HCl to waste water while distilling off benzene and chlorobenzene; eliminating iron through passing through strong alkali anionic exchange resin to obtain hydrochloric acid effluent; eluting iron complex anion in the strong alkali anionic exchange resin with distilled water as regenerant to obtain eluting liquid, which is high concentration iron trichloride solution capable of being used as water purifier, while regenerating the resin. When the process is used in treating waste water containing Fe ion 2000-8000 mg/L, hydrochloric acid 2.5-4.0 mol/L, benzene 500-1000 mg/L and chlorobenzene 100-200 mg/L, Fe ion over 99 % and benzene and chlorobenzene over 95% may be eliminated while the resource being recovered.

A treatment method for wastewater after vanadium precipitation comprises: detecting the concentrations of chromium (VI) and vanadium (V) in the wastewater after vanadium precipitation, and adding solid sodium pyrosulfite according to the total mass of the chromium (VI) and the vanadium (V) for a first reduction reaction; detecting the concentrations of the chromium (VI) and the vanadium (V) in the wastewater after vanadium precipitation and after the first reduction reaction, and adding ferrous sulphate or ferrous chloride according to the total mass of the chromium (VI) and the vanadium (V) for a second auxiliary reduction reaction; and adjusting pH value by using alkali, neutralizing, precipitating, press filtering, and the wastewater reaching the discharge standard for discharging. The indexes of chemical oxygen demand (COD), the suspension solids (SS), the total chromium (TCr) and the chromium (VI) are easy to control after the wastewater after vanadium precipitation being treated by using the method, and all the indexes meet the wastewater discharge standard of the nation. By using the method, a small quantity of waste residue is produced, the chromium and the vanadium are fully enriched in waste residue, and the waste residue can be used as the raw material for producing the vanadium and chromium, realizing the recycle of resource, eliminating environmental pollution and reducing wastewater treatment cost.

A method of producing a chlorinated hydrocarbon having 3 carbon atoms, comprising a conversion step for converting a chloropropane represented by the following formula (1) into a chloropropane represented by the following formula (2) by reacting it with chlorine in the presence of anhydrous aluminum chloride.

CCl₃—CCl_(2-m)H_m—CCl_(3-n)H_n  (1)

(In the above formula (1), m is 1 or 2, and n is an integer of 0 to 3.)

CCl₃—CCl_(3-m)H_(m-1)—CCl_(3-n)H_n  (2)

(In the above formula (2), m and n are the same integers as in the formula (1), respectively.)

The invention discloses a preparation method of alkane isomerization catalysts. The preparation method comprises the following steps of dipping an aluminium oxide carrier by a solution containing a group VIII metal compound, drying the solid after dipping, roasting or carrying out water chlorination, then dipping by an alkane solution containing alkyl aluminum chloride, and then drying under the presence of inert gases and under an anhydrous condition so as to obtain the catalyst. By taking dry basis aluminium oxide as a reference, the calculated content of group VIII metal of the obtained catalyst is 0.01-3.0% by mass, and the chlorine content is 4.0-10.0% by mass. The catalyst prepared by the method is low in reaction temperature, and is high in activity of isomerization and selectivity.

The invention discloses a resourceful treatment method for fused salt chlorination residues. According to the method, high-oxidizability alkaline waste salt water generated through fused salt chlorination tail gas purification or chloro-alkali chemical industry tail gas absorption waste liquor is used for treating leachate of the fused salt chlorination residues so as to recover NaCl, magnesium chloride hexahydrate and ferro-manganese residues, and low-cost resourceful treatment for the fused salt chlorination residues is achieved. Waste is treated with waste, the pollution problem of the fused salt chlorination residues is solved, NaCl, MgCl2 and ferro-manganese raw materials in the fused salt residues are recovered and used, and the resourceful treatment method has good economic benefits, has great significance in eliminating development bottleneck of technology application of preparing TiCl4 through titanium residue fused salt chlorination, can be widely applied to domestic and overseas fused salt chlorination-magnesium thermal electrolysis titanium sponge and fused salt chlorination titanium sponge enterprises and has wide popularization prospects.

The invention relates to a continuous production method of tetrachloroterephthalonitrile, comprising produce tetrachloroterephthalonitrile by gas phase chlorination catalyzing melting evaporated terephthalonitrile and chlorine in ebullated bed and fixed bed second-order series reactior, the concrete steps are: adding activated carbon catalyst of different requirement in ebullated bed and solid-bed reactor separately, dehydration by heating, filling excess chlorine for activating after dehydration finished; the melting evaporated terephthalonitrile, chlorine and nitrogen entering fluidized-bed reactor after mixed; the exit gas from ebullated bed entering solid-bed reactor, controlling the temperature of solid-bed reactor between 250-330deg C;The exit gas frim solid-bed reactor is chilled and separated by trap dyke, solid product tetrachloroterephthalonitrile enriched in the bottom of drip catcher. The technique is charactered with simple operation, less equipment invest, high yield, cleaning and good continuous operation. The product content is more than 98.0%,the tetrachlorobenzene content is 90%,the durability of catalyst is about 35 days.