34results about How to "Avoid the three wastes" patented technology

The invention discloses a preparation method of solid phase peptide synthesis triptorelin, which includes the following steps: with Rink Amide AM resins or Rink Amide MBHA resins as starting materials, amino acids with protective groups are sequentially connected according to solid phase synthesis, so as to obtain protective decapeptide resins, and meanwhile crude products are obtained by sequentially removing Fmoc-protective groups and synchronously removing side-chain protective groups and cutting peptides, and triptorelin elaborate products are prepared after the crude products are separated and purified by C18 (or C8 ) column and freeze-dried. The preparation method is stable in technology, convenient in raw and auxiliary material sources, short in production cycle, high in yield, stable in quality, low in production cost and high in transpeptidase yield. Besides, as the preparation method avoids using poisonous reagents, such as hydrogen fluoride, and the like, the pollution of three wastes is low, purification yield is over 25 percent and each step of transpeptidase yield is above 98 percent; the yield after cutting peptides is 78.8 percent and the total yield is 25.4 percent.

The invention discloses a chalone preparing method of solid-phase polypeptide, which comprises the following steps: adopting 2-chloride-trityl resin, 4-methyl trityl resin or 4-methoxyl trityl resin as raw material; connecting amino acid with protective group according to solid-phase synthetic method; obtaining protected octapeptide resin; removing Fmoc-protective group sequently; stripping side-chain protective group; cutting peptide to obtain reduced aoqu-peptide; oxidizing through air under pH 7-11 condition; separating and purifying rought product through C18 (C8) column to produce exquisite.

The present invention discloses a preparation method of an isoxazole compound and an isoxazole compound intermediate. According to the method, an intermediate acid (III) is prepared by substitution reaction of a compound (I) as a raw material and a compound (II) in the presence of a base and then oxidation reaction; an intermediate (IV) is prepared by methyl esterification of the intermediate acid (III); an intermediate (VI) is prepared by thionation of the intermediate (IV); an intermediate (VIII) is prepared by condensation of the intermediate (VI) and cyclopropyl methyl ketone under basic conditions; an intermediate (X) is prepared by ene-etherification reaction of the intermediate (VIII) and ortho-formate and then cyclization with hydroxylamine hydrochloride; and the isoxazole compound (XI) is prepared by oxidation of methylthio groups of the intermediate (X) by hydrogen peroxide. Raw materials are readily available, yield is high, purity is high, three-waste is low, cost is low, and the preparation method has good industrial value.

A preparation method for preparing chitosan by utilizing snow crab shells relates to the technical field of preparation methods of high-viscosity chitosan, and particularly belongs to a preparation method for preparing chitosan by utilizing fresh snow crab shells. Crab shell pretreatment: taking 200 parts (by mass) of fresh snow crab shells, and crushing the fresh snow crab shells; decalcifying the crab shells: adding 600-1000 parts by mass of a citric acid solution with the mass percent concentration of 5-10% into the crab shells, soaking for 6-15 hours, filtering, washing the crab shells obtained by filtering by using water as a washing solution, and combining washing residual liquid with a filtrate to obtain a mixture for storage; extracting organic calcium: filtering the mixture through a plate frame, and drying filter residues to obtain calcium citrate; and collecting the residual mixed solution for later use after subsequent treatment. Three wastes are avoided in the whole production process, and zero waste, zero emission and high-value utilization are realized. A high-temperature strong-alkali deproteinization procedure is not needed, so that energy conservation, environmental protection and stable product quality are realized. The product has high viscosity and good quality.

The invention discloses a preparation method of sulfophenyl pyrazolone. The method consists of: taking a compound (I) as the raw material, in the presence of alkali, subjecting the compound (I) and a compound (II) to substitution reaction, then conducting oxidation by an oxidizing agent to obtain a compound (III), esterfying the compound (III) to obtain a compound (IV), subjecting the compound (IV) to thionation to obtain a compound (VI), conducting oxidation and hydrolysis (or hydrolysis, oxidation) on the compound (VI) to obtain a compound (VII), subjecting the compound (VII) to acyl chlorination, subjecting the obtained acyl chloride (VIII) and 1, 3-dimethyl-5-hydroxypyrazole to esterification reaction so as to obtain a compound (IX), and finally carrying out rearrangement on the compound (IX) to obtain a compound (X). The method provided by the invention has the advantages of cheap and easily available raw materials, high reaction conversion rate, few three wastes, and is beneficial to industrial production.

The invention relates to a polymer material wrappage of pigment yellow 138 or a derivative of pigment yellow 138, a preparation method of the polymer material wrappage, and a downstream product of thepolymer material wrappage. The method comprises the following steps: mixing a monoanhydride aromatic compound, an 8-aminoquinaldine compound, a solid organic acid and a thermoplastic polymer material; adjusting the reaction molar ratio of the raw materials and the mass content of pigment yellow 138 or the derivative of pigment yellow 138 in a final product so as to realize extruding or kneading of an obtained mixture and obtain the polymer material wrappage of pigment yellow 138 or the derivative of pigment yellow 138 in one step. The raw material reactants of pigment yellow 138 or the derivative of pigment yellow 138 have better dispersity in the high polymer material; therefore, pigment yellow 138 or the derivative of pigment yellow 138 can be directly generated and uniformly dispersedin the high polymer material in the extrusion or kneading process, no solvent is required to be added in the process, separation and purification are not required after the reaction is finished, the generation of three wastes in the traditional synthesis process of pigment yellow 138 or the derivative is avoided, the process flow is greatly simplified, and the energy consumption is reduced.

The invention relates to the field of fine chemicals, and discloses a 3,5-dichloro-2-pentanone preparation method, which comprises: making alpha-acetyl-gamma-butyrolactone contact sulfonyl chloride ina solvent-free system to carry out a chlorination reaction, mixing the material obtained by the chlorination reaction with water, adding hydrochloric acid to the obtained mixture in a dropwise manner, and carrying out a ring-opening reaction. According to the present invention, the solvent-free one-pot reaction is achieved by using the cheap industrial chemicals as the raw materials, such that the process operation is simplified, the three-waste and the production cost are reduced, and the pollution caused by the use of the metal catalyst is avoided.

The invention provides a preparation method of 3-morpholinopropanesulfonic acid, wherein the preparation method comprises the steps: dissolving 1,3-propanesultone with an organic solvent A to obtain an organic solution containing 1,3-propanesultone, and dissolving morpholine with an organic solvent B to obtain an organic solution containing morpholine, wherein the molar ratio of the 1,3-propanesultone to the morpholine is 1:1; respectively pumping the organic solution containing 1,3-propanesultone and the organic solution containing morpholine into a micro-channel reactor at the same time, andcarrying out a reaction to obtain a reaction solution, wherein the pumping speed of the organic solution containing 1,3-propanesultone is 20-35 kg/h, and the pumping speed of the organic solution containing morpholine is 10-25 kg/h; and separating out a 3-morpholinopropanesulfonic acid crude product from the obtained reaction solution by adopting freezing crystallization, then introducing nitrogen, and carrying out filter pressing to obtain the 3-morpholinopropanesulfonic acid finished product. According to the method, 1,3-propanesultone and morpholine are used as raw materials, the micro-channel reactor is adopted, and reaction conditions are set, so that the yield of the product can be greatly increased.

Provided are a device and method for separating N-methylpyrrolidine, water and tetrahydrofuran. The device comprises a crude product dehydration working section and a product refining working section. The crude product dehydration working section comprises a crude product intermittent column, a first condenser, a phase splitting tank, a backflow head and the like. The crude product intermittent column comprises a crude steaming column reactor and a crude steaming column. The product refining working section comprises a refining intermittent column, a second condenser, a transition cut fraction receiving tan and a product receiving tank. The refining intermittent column comprises a rectifying column reactor and a rectifying column located at the top of the rectifying column reactor. The crude product dehydration working section is communicated with the rectifying column reactor of the product refining working section through a crude product storage tank communicated with the crude steaming column reactor. A two-column intermittent rectifying process is adopted in the method, water and tetrahydrofuran are taken out through the crude product intermittent column, left raw materials are purified through the product refining working section, and high-purity N-methylpyrrolidine is obtained. The problems that a traditional device and technique are large in energy consumption, low in yield, high in production cost and troublesome in aftertreatment are solved.

The invention discloses a preparation method of alpha, alpha-diphenyl-4-piperidine methanol, which comprises the following steps of by using benzophenone and 4-cyanopyridine as raw materials, carrying out free radical coupling reaction under the action of alkali metal to obtain alpha, alpha-diphenyl-4-piperidine methanol, reacting the obtained alpha, alpha-diphenyl-4-pyridine methanol with a benzylation reagent to generate N-benzyl-alpha, alpha-diphenyl-4-pyridine methanol, carrying out hydroboration reduction on the N-benzyl-alpha, alpha-diphenyl-4-pyridine methanol to obtain (1-benzyl-1, 2, 3, 6-tetrahydropyridine-4-yl)benzhydrol, ane enabling (1-benzyl-1, 2, 3, 6-tetrahydropyridine-4-yl)benzhydrol to be subjected to catalytic hydrogenation and debenzylation protection to obtain alpha, alpha-diphenyl-4-piperidine methanol. The method has the advantages of cheap and accessible raw materials, high reaction yield and high controllability, and is suitable for industrial production requirements.

The invention belongs to the technical field of spraying-free materials, and particularly relates to a spraying-free metal effect material and a preparation method thereof. A spraying-free metal effect material is prepared from the following raw materials: an acrylate copolymer, an acrylate polymer, a polystyrene series high-molecular polymer, metal powder and an antioxidant. The spraying-free metal effect material prepared by the invention can solve the problem about the overall stability of the system and the dispersing performance and wettability of metal powder, pearl powder and the like in the system, can better imitate the appearance of the coating effect of metals such as aluminum, bronze, red copper, gold or bronze, is low-carbon and environment-friendly, avoids the problems of three wastes and huge energy consumption, and has lower cost and high economic benefit.

The invention discloses a novel preparation method of cyclopropyl methyl ketone. The preparation method comprises the following steps: an ionic liquid is added to a microwave reactor, stirring is started, and microwave heating is started to increase the temperature to 100-140 DEG C; 2-acetylbutyrolactone is added slowly and continuously at 100-140 DEG C, a catalytic cracking reaction of the ionicliquid is promoted by microwaves, and a cracked product cyclopropyl methyl ketone is withdrawn through a distillation column continuously. The ionic liquid is promoted by the microwaves for catalyticcracking of the raw material 2-acetylbutyrolactone, high selectivity is realized when the reaction is performed under the conditions, impurities are almost avoided in the reaction, the content of cyclopropyl methyl ketone obtained with the method is higher than 99% and the total reaction yield is higher than 98%, which are both far higher than those obtained in the traditional method and in literature report. Production of three wastes in the reaction process is completely avoided, and the environment is protected; danger probably caused in a high-temperature production process is avoided, higher safety is realized, and operation efficiency can be increased.