44results about How to "High synthesis cost" patented technology

The invention discloses a synchronous denitrification and dephosphorization adsorbent as well as a preparation method and application thereof, and belongs to the field of waste water treatment. The synchronous denitrification and dephosphorization adsorbent disclosed by the invention relates to in-situ treatment of domestic sewage and eutrophication water bodies, and comprises a calcined product of magnesite stone powder and zeolite powder. The synchronous denitrification and dephosphorization adsorbent is made through the following steps of (1) crushing magnesite stone ore, performing screening, and performing high temperature calcination so as to obtain the calcined product; and crushing zeolite, grinding the crushed zeolite, and screening the ground zeolite with a 100-mesh sieve so as to obtain the zeolite powder; and (2) mixing the calcined product with the zeolite powder, performing synthesis by a hydrothermal method, then performing cooling, and performing centrifugal filtration so as to obtain a synthetic product namely the synchronous denitrification and dephosphorization adsorbent. The synchronous denitrification and dephosphorization adsorbent and the preparation method thereof disclosed by the invention can be applied to the in-situ treatment of waste water containing ammonia nitrogen and phosphate, such as the domestic sewage, chemical industry waste water and eutrophication watercourse water bodies.

The invention discloses a method for preparing degarelix through fragment condensation. Three side chain protection peptide fragment sequences are respectively synthesized; each peptide fragment is gradually coupled to obtain whole protection degarelix ; then, protecting groups are removed through cracking so as to obtain degarelix crude peptides; purification and salt replacement are performed toobtain the degarelix, wherein the three peptide fragment sequences are as follows, the first peptide fragment sequence is 1st to 4th site amino acids in the degarelix sequence; the second peptide fragment sequence is 5th to 8th site amino acids in the degarelix sequence; the third peptide fragment sequence is 9th to 10th site amino acids in the degarelix sequence. The method provided by the invention has the advantages that the impurities are removed; the yield is improved; the synthesis cost is greatly reduced; the large-scale industrialized production is facilitated.

The invention discloses a new process for synthesizing a low-cost super-absorbent resin. The process mainly comprises the following steps of: preparing strong caustic solution with a certain concentration, dropwise adding the strong caustic solution into a potato starch milk at a room temperature to obtain alkali pasted potato starch, heating the alkali pasted potato starch in water bath under the protection of nitrogen, performing graft copolymerization on the alkali pasted potato starch, crylic acid and sodium salt of the crylic acid to obtain the low-cost super-absorbent resin, wherein the low-cost super-absorbent resin has good liquid absorption ability; the highest deionized water absorptivity is 150-450g/g; the highest water absorptivity is 80-200g/g; the highest normal saline absorptivity is 25-40g/g; and the gel state is good and the water holding ability is strong after absorbing water. In the invention, the strong caustic solution is totally used to paste the potato starch milk; and the alkali pasted potato starch prepared by the method is used to synthesize the low-cost super-absorbent resin for the first time. Compared with other preparation methods of the super-absorbent resin, the method of the invention has the advantages of novel proportioning of raw materials, low cost, simple process, low energy consumption, is easy to operate and control, and develops a new path to large-scale production of the super-absorbent resin in the future.

The invention relates to a process for synthesizing ibutilide fumarate. 2-pyrrolidone is taken as an initial raw material, DMF is taken as a solvent, and the 2-pyrrolidone and the DMF are N-alkylated with halogen ethane to obtain N-ethyl-butyrolactam under the catalysis; then 4-ethylamino-ethyl acetic acid is obtained through acid hydrolysis; the 4-ethylamino-ethyl acetic acid reacts with chloroheptane under the catalysis to obtain 4-ethylheptylamino-ethyl acetic acid; 4-ethylheptylamino-n-butyryl chloride is obtained through the acidylation; and the 4-ethylheptylamino-n-butyryl chloride is subjected to friedel-crafts reaction with N-phenylmethanesulfonamide to obtain (+/-)-N-[4-[4-(ethylheptylamino)-1-ketonebutyl]phenyl] methanesulfonamide, (+/-)-N-[4-[4-(ethylheptylamino)-1-hydroxybutyl]phenyl] methanesulfonamide is obtained by reducing sodium borohydride and/or tetrahydro-aluminate lithium, and then a target compound, namely the tetrahydro-aluminate lithium is obtained by salifying with fumaric acid. The process is more reasonable and is more convenient for industrialized production.

The invention relates to a normal-temperature and normal-pressure synthesizing method of a Zr-Si-C ceramic precursor. The normal-temperature and normal-pressure synthesizing method includes the steps of firstly, dissolving dimethyl zirconium dicyclopentadiene in an organic solvent under inert gas atmosphere protection, stirring, adding an organic lithium compound and a ligand compound, and drying to obtain active zirconium dicyclopentadiene lithium salt; secondly, dissolving the active zirconium dicyclopentadiene lithium salt with an organic solvent under inert gas atmosphere protection, stirring, adding halogenated silane monomer, performing polymerization reaction, dropwise adding a terminating agent to terminate the reaction, filtering, concentrating, purifying, and drying to obtain the Zr-Si-C ceramic precursor. The normal-temperature and normal-pressure synthesizing method has the advantages that conditions such as high temperature, low temperature, high pressure and energizing are not needed, the reaction can be performed under normal temperature and normal pressure, the dimethyl zirconium dicyclopentadiene high in activity and cheap and safe n-butyl lithium are used to have reaction with the halogenated silane monomer so as to prepare the Zr-Si-C ceramic precursor through a two-step method, and the preparation method is simple, scientific and reasonable; the Zr-Si-C ceramic precursor synthesized by the method is diversified and can be used for prepared various kinds of Zr-Si-C ceramics.

The invention belongs to the field of drug synthesis, and provides a ketanserin tartrate preparation method, wherein ketanserin and DL-tartaric acid are used as raw materials, ethanol is used as a solvent, heating dissolving is performed, and the target product is directly obtained through crystallization. According to the present invention, with the method, the total yield can reach 80%, and theproduct purity exceeds 99.0%; and the method has advantages of simple process synthesis steps, substantially reduced production cost and low environment pollution, and substantially alleviates the environmental problem caused by the production of ketanserin tartrate.

The invention discloses a method for preparing nitrogen and potassium containing super absorbent resin by utilizing a carboxymethyl sunflower disc. The method for preparing the nitrogen and potassium containing super absorbent resin by utilizing the carboxymethyl sunflower disc is characterized by comprising the following steps: mixing a certain amount of sodium hydroxide solution with sunflower disc powder in a three-opening bottle, soaking, so that the sunflower disc is fully swelled; dropwise adding the sodium hydroxide solution into the mixture, stirring for 1 hour in a water bath kettle at the temperature of 30 DEG C, then dropwise adding a sodium monochloroacetate solution in reaction mixture, carrying out reaction for 2 hours, then pouring the mixture after reaction is finished into a stainless steel disc, carrying out reaction in a drying oven, washing with 70% ethyl alcohol after drying is finished, then drying, and smashing, so that the carboxymethyl sunflower disc is obtained; uniformly mixing acrylic acid and potassium acrylate, acrylamide, the carboxymethyl sunflower disc, potassium persulphate, N,N'-methylene bisacrylamide and deionized water, protecting by adopting nitrogen, heating in water bath and stirring, stopping stirring at a polymerization temperature, continuously heating, insulating and carrying out reaction for 2 hours in boiling water bath, stopping introduction of nitrogen, taking out reactants, placing the reactants into a blast drying oven at the temperature of 40-60 DEG C to be dried to constant weight, and smashing, so that the nitrogen and potassium containing super absorbent resin product is obtained.

The invention discloses a synthesis method of a furan [3, 2-b] pyridine derivative, which comprises the following steps: refluxing a substance as shown in a formula (I) and triphenylphosphine in a solvent, cooling and filtering to obtain a compound as shown in a formula (II); carrying out Wittig reaction on the compound shown in the formula (II) and formate under the action of alkali to obtain a compound shown in a formula (III); and performing cyclization reaction on the compound represented by the formula (III) under an acidic condition to obtain a compound represented by a formula (IV). The method disclosed by the invention is convenient to operate, simple in process, simple and easily available in raw materials and low in cost, and is suitable for small-scale preparation in a laboratory and industrial production.

The invention discloses a preparation method of gabapentin acetate. The preparation method comprises the following steps of: 1) coupling amino resin with amino acid to obtain linear peptide resin; 2) performing acetylation reaction on the linear peptide resin obtained in the step 1); 3) cracking the linear peptide resin obtained after the acetylation reaction in the step 2) to obtain linear peptide; 4) modifying the linear peptide in the step 3) with ethylamino-1H-pyrazole under an alkaline condition to obtain crude gabapentin acetate peptide; and 5) purifying the crude gabapentin acetate peptide. According to the preparation method, the use of Fmoc-HArg (Et) 2-OH and Fmoc-D-HArg (Et) 2-OH which are high in synthesis cost and easy to decompose as raw materials is avoided, and the defects that the reaction time is long, the operation is complicated and the purity of the obtained crude peptide is not high due to the fact that alkali needs to be continuously added to adjust the pH to 7.5-10.5 for reaction in the reaction process are overcome.

The invention provides a method for preparing a NaY molecular sieve by recycling a NaY mother liquor, and belongs to the technical field of inorganic synthesis. The method solves the technical problems of low NaY mother liquor recycling rate, large pollution, high utilization cost and the like in the prior art. The synthesis method comprises the following steps: (1) stirring NaY mother liquor until the NaY mother liquor is uniform; (2) slowly adding a metered supplementary silicon source into the mother liquor according to the modulus of 3.0-3.4 until the supplementary silicon source is completely dissolved in the pulped NaY mother liquor, and controlling the temperature of the mixture of the NaY mother liquor and the supplementary silicon source to be 30-80 DEG C in the dissolving processto obtain high-modulus recycled water glass; and (3) synthesizing the NaY molecular sieve by utilizing the recycled water glass obtained in the step (2) according to a gel method. According to the method, the NaY mother liquor can be completely recycled, and the pollution of waste liquor and waste residues to the environment is reduced.