46results about How to "High synthetic conversion rate" patented technology

A low-free radical TDI polyurethane curing agent, its production and product are disclosed. The process is carried out by putting tolylene-diisoester cyanate, solvent S and catalyst A into reactor, adding into antioxidant and long-chain alcohol, agitating in reactor, heating, keeping temperature, inspecting NCO value, adding into phase-transferring solvent X while reaching NCO value to 20-40%, adding into catalyst B till reaching NCO value to 10-15, adding into inhibitor to stop reaction, adding into solvent S, decreasing pressure, distilling and removing phase-transferring solvent X. It's cheap and convenient.

The invention belongs to the field of urea preparation, and particularly relates to an energy-saving urea production system and a production process thereof. The system comprises a CO2 compressor, an ammonium carbamate pump, a liquid ammonia pump and a urea synthesizer. The system is characterized in that the CO2 compressor is connected with the ammonium carbamate pump and the liquid ammonia pump, the liquid ammonia pump is connected with the urea synthesizer, a falling-film countercurrent medium-pressure decomposing tower and a heater, an ammonium carbamate condenser, an ammonium carbamate separator, a three-stage medium-pressure absorption tower and an evaporative ammonia refrigeration recoverer, a liquid ammonia buffer tank, an inert gas scrubber, a tail-gas ammonia cleaning fine purifier, a low-pressure decomposing tower and a heater, a dimethyl liquid preheater, a horizontal low-pressure absorber, a falling film type pre-evaporator, a one-stage evaporator and a one-stage evaporative condenser, a two-stage evaporator and a two-stage evaporative condenser, and a process wastewater desorption and hydrolysis tower are sequentially connected behind the urea synthesizer in sequence. The energy-saving urea production system has the advantages of low investment, low energy consumption, simple operation, high elasticity and the like, thereby the process technology has considerable economic benefit and social benefit.

The invention discloses a method for biological fuel oil. In the method, biological matter, mineral matter, household garbage and urban sludge are used as raw materials, and the raw materials are dehydrated and carbonized into a high-carbon content solid with a certain shape and size by a thermal-extrusion molding technique and then are prepared into the novel biological fuel oil by adopting a gasification process and Fischer-Tropsch synthesis. The method has the advantages of wide range of the raw materials, low production cost and high gasification and Fischer-Tropsch synthesizing efficiency and is easy to control the production process, and the biological fuel oil has the advantages of high yield and good quality and is suitable for industrial production.

A production method of adenosine triphosphate (ATP) mainly includes following steps: (1) treatment of beer yeast; (2) fermentation to extract a conversion enzyme; (3) plate-frame pressure filtration; (4) micro-filtration; (5) fermentation to synthesize the ATP; (6) nano-filtering desalination; (7) resin adsorption; (8) resin washing elution; (9) ultra-filtration to remove protein and heat source; (8) precipitation with ethanol; and (9) a drying operation. In the invention, due to a high-efficient energy-saving membrane separation technology, after the step of fermentation to synthesize the ATP, the purity of the conversion enzyme can be increased through the micro-filtration, thereby increasing synthetic conversion rate of the ATP. During the separation and purification process of a fermentation synthetic liquid of the ATP, the nano-filtration is employed for removing inorganic salt nutrients added during the synthesis process so that the ATP adsorption capacity of ion exchange resin can be increased. By means of the ultra-filtration to remove protein and heat source, the purity of the ATP is increased. The production method can increase the production capacity, recycle rate and purity of the ATP, can reduce the consumption of chemical reagents, is simplified in processes, can reduce pollution emission and the like.

The invention relates to a preparation method of rhenium hexafluoride, which belongs to the technical field of fluorine chemical industry. In this method, the rhenium powder and nitrogen trifluoride mainly generate a mixture of rhenium hexafluoride and rhenium heptafluoride by adjusting the fluorination reaction conditions, and the disproportionation reaction of other valence rhenium fluorides can be basically avoided; The reaction conditions are such that rhenium heptafluoride reacts with rhenium powder to form rhenium hexafluoride, preventing rhenium heptafluoride and rhenium hexafluoride from being reduced to rhenium fluoride in a lower valence state. The method of the invention has the advantages of simple operation, safety and economy, high synthesis conversion rate, and the prepared rhenium hexafluoride has a purity higher than 90 wt%.

The invention relates to a method for automatically controlling and adjusting sodium hydrosulfite synthesis system pressure and backflow quantity, which adopts an automatic control system to adjust the sodium hydrosulfite synthesis system pressure and the backflow quantity, has scientific process steps and process parameters and effectively resolves the problems of uncertainty and instability of pressure and backflow quantity in the manual control and adjustment of the sodium hydrosulfite synthesis system. The method enables sodium hydrosulfite combining reaction to be good in stability, even in backflow quantity, stable in sodium hydrosulfite quality and low in production cost.

The invention relates to a method for preparing alpha-hemihydrate calcium sulfate crystal whisker. The method comprises the following steps: (1) mixing K2SO4 and Ca(NO3)2.5H2O according to a mole ratio of the K2SO4 to the Ca(NO3)2.5H2O of 1:1, carrying out electric stirring for 30 minutes to prepare amorphous calcium sulfate; (2) dissolving the amorphous calcium sulfate into deionized water, carrying out stirring for 10 minutes, the carrying out ultrasonic dispersion for 20 minutes to prepare calcium sulfate suspension liquid having a mass fraction of 4-6%; transferring the calcium sulfate suspension liquid to a high pressure hydro-thermal reaction kettle, then carrying out a reaction for 6-18 hours under saturated vapor pressure at a reaction temperature of 110-140 DEG C, filtering the resulting precursor when the precursor is hot, followed by carrying out forced air drying for 6-8 hours at the temperature of 110-130 DEG C to prepare the alpha-hemihydrate calcium sulfate crystal whisker. According to the present invention, the amorphous calcium sulfate is adopted as the raw material, the crystal modifier is not required; the prepared alpha-hemihydrate calcium sulfate crystal whisker has characteristics of high purity, uniform long diameter and high length-diameter ratio; the reaction conditions are mild; the production process accords with the requirements of the industrial production.

A polycarboxylic acid water reducer master batch having a sulpho-phospho double chain transferring function is disclosed. Raw materials include 345-350 parts of a polyether macromonomer, 32.0-40.0 parts of acrylic acid, 3.0-8.0 parts of a sulpho chain transferring agent, 1.0-5.0 parts of a phospho chain transferring agent, 2.0-5.0 parts of hydrogen peroxide and 0.35-0.75 part of vitamin C, with the balance being water, and with the total mass of the raw materials being 1000 parts. A polycarboxylic acid water reducer synthesized from the master batch can be polymerized at a low temperature, carboxyl, sulpho and phosphor groups are alternatively arranged, adsorbability and anchoring capability are stronger, and a product has characteristics of a high water reduction rate and wide adaptability. The modified master batch is suitable for a situation that a grinding aid adopted in a cement preparing process contains a retarder or salt electrolyte the competitive adsorbability of which is higher than competitive adsorbability of the carboxyl and thiol.