46results about How to "Reduce energy consumption for concentration" patented technology

The invention relates to a method for synthesizing trioxymethylene by methanol through condensation, oxidation and polycondensation. According to the invention, methanol and dilute formaldehyde with concentration of 5-30% separated from a trioxymethylene apparatus are taken as raw materials to synthesize methylal with concentration of 85-99.9%; methylal and air are subjected to catalyst oxidation to generate formaldehyde through an iron molybdenum method, through refining water and methylal unit tower waste water absorption, a formaldehyde aqueous solution with concentration of 70% is generated; high-concentration formaldehyde is introduced into a trioxymethylene synthetic tower, and the trioxymethylene is synthesized under existence of a strong-acid cation exchange resin catalyst, and trioxymethylene with content of 99.9% can be obtained through steps of rectification and concentration, extraction, rectification, and purifying. The method solves the problems of low conversion rate, selectivity and low yield during a trioxymethylene production process, solves the problems of low catalyst reaction efficiency and corrosivity, and solves the problems of complex technology and high energy consumption. The method provides good raw materials for producing PODE, and realization of industrialization of PODE can solve the problem of excess production capacity of methanol in our country.

The invention provides a method for separating and recovering sodium arsenate and alkali by fractional crystallization method which consists of, condensing the arsenic alkaline residue infusion, cooling down to below room temperature, stewing for 2 hrs, filtering to obtain sodium arsenate, concentrating the crystallization mother liquor, and calcining the crystallized product.

The invention relates to a method for producing high-quality copper sulfate through low-pressure oxygen leaching of copper slag. A copper-bearing material with metallic copper or cuprous oxide content greater than 15wt% serves as a raw material, and the method comprises the steps of copper slag or spongy copper slag pickling of zinc hydrometallurgy. A dilute sulphuric acid solution is adopted for low-pressure oxygen leaching of the raw material, an obtained leachate is subjected to combined crystallization including cooling crystallization and salting-out crystallization, a copper sulfate crystal is obtained after liquid-solid separation, and dried after multistage washing, and copper sulfate meeting requirements of above a premium grade specified in YS/T 94-2007 is obtained.

The invention relates to the field of coal catalytic gasification, particularly to a method for recovery of potassium catalyst in coal catalytic gasification ash. While reducing water consumption and lowering energy consumption, the method can enhance the total recovery rate of potassium in ash, and overcomes the defects of large water consumption, low concentration of potassium recovered solution, high energy consumption of the evaporation and concentration process in the recovery technology of the prior. The recovery method provided by the embodiment of the invention includes: a washing section, and a digestion section containing at least two-stage digestion reaction. In the washing section, coal catalytic gasification ash is subjected to washing, and the obtained washing slag enters the reactor of the last stage digestion reaction to serve as the raw material of the last stage digestion reaction. In the digestion section, the potassium solution generated by a former stage digestion reaction enters the reactor of a next stage digestion reaction, the solid product enters the reactor of the former stage digestion reaction to serves as the raw material of the former stage digestion reaction, and the potassium solution in the reactor of the last stage digestion reaction enters the washing section.

The invention disclosed a way to extract water soluble ingredient in danshen root with gradient hyper sound fortified successive countercurrent. After putting the jar with danshen root and solvents in hyper sound (the frequency is 40kHz and the power is 320-600W) for t, transferring the solvent to another jar with danshen root; putting new solvent into the first jar; extracting the two jars of danshen root at the same time and transferring the solvent one by one; successively countercurrent extracting the active ingredient in danshen root. Compared with the traditional hyper sound extracting method, the countercurrent extracting method in the invention can keep the density differences between the solid and liquid phase in a high level and decrease the solvents dosage so as to save the energy to condense, increase the extracting efficiency and increase the yield.

The invention belongs to the technical field of extraction of lithium from ore, and particularly relates to lepidolite ore and sodium sulfate roasting and leaching method. The lepidolite ore and sodium sulfate roasting and leaching method comprises the following steps of: step (1). processing raw materials, and finely grinding sodium sulfate, calcium oxide, calcium carbonate and a rubidium and cesium displacer to a set degree; step (2). mixing, to be specific, uniformly mixing lepidolite concentrate powder with the sodium sulfate, the calcium oxide, the calcium carbonate and the rubidium and cesium displacer finely ground in the step (1) according to the set ratio; step (3). calcination, to be specific, calcining the above mixture at the temperature of 850 to 1000 DEG C to obtain a calcined clinker called calcine; step (4). finely grinding; step (5). transferring the finely ground calcine to a leaching tank, and leaching lithium and rubidium in the calcine; and step (6). mixing leaching residues with a set amount of water, stirring and washing at a set temperature, and washing out lithium, rubidium, and cesium in the leaching residues. According to the technical solution of the lepidolite ore and sodium sulfate roasting and leaching method, potassium sulfate is not used; and only single sodium sulfate is used, is a by-product of a lithium carbonate precipitation process, and does not need to be purchased, thus, the reagent cost is reduced, and the sulfate roasting technology has economical efficiency.

The invention relates to a method for extracting effective component of traditional Chinese medicine, with dynamic overflow continuous reverse-flow method, wherein said method uses several extractors, while each extractor works independently and they use active overflow method, to transfer liquid continuously. Compared with traditional method, the invention improves extracting speed, reduce solvent consumption, reduce following energy consumption and improve efficiency. The invention can reduce extracting temperature, etc. And the invention comprise several pots, heater, condenser, tubes, pump and value which control the active overflow between pots, and the meter element controlling the balance of whole device.

The invention discloses a method for extracting asiaticoside from asiatic centella comprising the step of using asiatic centella as raw material, and water solution of ethanol or methanol as extraction solvent for extracting asiaticoside from asiatic centella in high efficiency by percolation method for achieving more than 93% extraction ratio for the asiaticoside. The method has high extraction ratio, small consumption of solvent, low production cost, and easy commercial process.

The present invention discloses a method for extracting saponins effective component from Chinese medicinal material notoginseng. Said method adopts the following steps: firstly, pulverizing notoginseng root to obtain notoginseng powder whose grain size is 20-80 meshes, utilizing four extraction tanks of A,B,C and D, respectively adding 10g of notoginseng powder into every extraction tank, then adding 35%-90% ethyl alcohol solution into said four extraction tanks respectively, heating to 35-80deg.C and extracting for 20-60 min., successively making extraction of D,C.B and A to make effective component contents in extracts of four extraction tanks be successively decreased, then combining extracts. Said method can greatly raise extraction efficiency of notoginseng saponins effective component.

The invention provides a method for increasing positive permeation performance by using a ferric lactate complex as a draw solution, and belongs to the technical field of environmental pollution control engineering. The ferric lactate complex is prepared through a mild-condition one pot method, and the ferric lactate complex is applied to a positive permeation technology serving as the draw solution and is used for increasing the performance of the process. Due to structural characteristics of the ferric lactate complex, the ferric lactate complex prepared in the invention has higher water flux and lower reverse salt flux; meanwhile, the source of raw materials is wide, the cost is low, the preparation condition is mild, the toxicity is low, the membrane compatibility is good, and the recovery rate of the draw solution is higher, so that by using the ferric lactate complex as the draw solution, positive permeation can be effectively increased, and wider application of the positive permeation technology can be promoted through further study on the draw solution.

The invention relates to a method for preparing nicotine sulfate, and belongs to the technical field of tobacco chemistry. According to the method, an aquaporin membrane and a polyamide membrane are used as forward osmosis concentration membranes, an inorganic salt is used as an absorbing agent, and a low-concentration nicotine distillate is subjected to forward osmosis concentration until the trapped fluid nicotine concentration is 5%-20%; 5%-40% sulfuric acid which is slightly excessive in chemical calculation is added into a trapped fluid to obtain a nicotine sulfate solution with relatively high concentration, and then evaporating and concentrating are carried out to obtain a 40%-60% nicotine sulfate product. According to the method, the concentration of the reactant nicotine during nicotine sulfate generation is greatly improved by adopting forward osmosis concentration, so that the concentration of the reaction product nicotine sulfate is improved, the evaporation capacity of water during preparation of a final product by subsequent evaporation and concentration is reduced, and the evaporation energy consumption is greatly reduced; by utilizing the characteristic of poor interception efficiency of forward osmosis concentration on ammonia, the ammonia content in the trapped liquid is greatly reduced, so that the ammonium salt content in a final product is greatly reduced,and the purity of nicotine sulfate is greatly improved.

The invention relates to the technical field of extracting lithium from ores, and particularly discloses a pretreatment and leaching method of lepidolite. The method comprises the first step of grinding of a reagent, the second step of mixing, the third step of roasting, the fourth step of crushing and grinding, the fifth step of one-stage leaching, the sixth step of two-stage leaching and the seventh step of pulping and washing. The method is economical and high in operability and has the industrial application value, calcium oxide and calcium carbonate are added during roasting to play a role of fixing fluorine, the sintering performance of the calcine can be improved, and calcine is loose and fragile.

The invention discloses an environment-friendly clean production method of high-purity cyanoacetic acid, cyanoacetate and malonate. The method comprises the following steps: carrying out an acidification reaction on sodium cyanoacetate and hydrochloric acid or HCl gas to obtain an acidified solution, carrying out salt precipitation by using a salt precipitation agent, filtering to obtain a filtrate, carrying out electrodialysis and other desalination treatments to obtain a desalted solution, concentrating the desalted solution, and crystallizing to prepare high-purity cyanoacetic acid, or esterifying to prepare cyanoacetate, or carrying out acidolysis and esterification to prepare malonate. According to the method, cyanoacetic acid and sodium chloride are well separated by desalting methods such as electrodialysis after salt precipitation; and the problems of cyanoacetic acid decomposition caused by concentration separation of cyanoacetic acid and salt and sulfuric acid consumption andmixed salt wastewater treatment caused by residual sodium chloride during esterification in the prior art are avoided, so that the method is the environment-friendly and clean production method.

The invention belongs to the field of chemical industry, and particularly relates to a preparation method of sodium chlorate. The preparation method of sodium chlorate comprises the following steps: firstly dissolving sodium chloride into water to obtain a saturated sodium chloride solution, then carrying out filtering, carrying out diluting, and carrying out electrolyzing to obtain a crude sodiumchlorate solution; adding an ionic chelating agent into the crude sodium chlorate solution, carrying out standing, and carrying out centrifuging to obtain a purified sodium chlorate solution A; adding a hydrochloric acid solution, and removing bromine, chlorate radicals and free chlorine in a bromine removal tower to obtain a purified sodium chlorate solution B; adding sodium hydroxide for neutralizing, carrying out concentrating to obtain a concentrated sodium chlorate solution, finally adding an anti-caking agent, and carrying out crystallizing to obtain sodium chlorate. According to the method, the ionic chelating agent is added in the process of preparing sodium chlorate to remove metal ions in the solution, so that purity of the obtained sodium chlorate is higher; the efficient anti-caking agent is added, so that the defect that sodium chlorate is easily caked in a placing process is overcome, and quality of the sodium chlorate is remarkably improved; and ultrasonic concentrationis adopted, so that energy is saved.

The invention provides a fruit juice membrane concentration system. The fruit juice membrane concentration system comprises a raw material storing jar, a first pump, a filtering sieve, a second pump,an ultrafiltration jar, a third pump, a nanofiltratoin jar, a fourth pump, a concentration jar, a concentrated solution storing jar, a clean water storing jar, an evaporator and a buffer jar. When thefruit juice membrane concentration system works, fruit juice is subjected to purification treatment sequentially through the filtering sieve, the ultrafiltration jar, the nanofiltratoin jar and the concentration jar of the fruit juice membrane concentration system, the fruit juice after purification treatment is inputted in the concentrated solution storing jar, so that the situation that the separation precision of the fruit juice is high can be guaranteed, and the concentration energy consumption of the fruit juice is reduced; in addition, the clean water storing jar is connected with the inlet of the ultrafiltration jar, so that the cleaning of the fruit juice membrane concentration system can be realized in an on-line manner; and the evaporator and the buffer jar which are connected with the clean water storing jar can perform evaporation and condensation on filter liquor of the concentration jar, the nanofiltratoin jar and the ultrafiltration jar to obtain clean water, and the clean water is poured into the clean water storing jar, so that the cyclic utilization of the filter liquor is realized.