13 results about "Propanolamine" patented technology

The invention relates to the technical field of petrochemical engineering, in particular to a continuous production method of high-stability N-methyldiisopropanolamine. The method comprises the following steps: heating and reacting methylisopropanolamine and propylene oxide under the action of a specific catalyst to generate an N-methyldiisopropanolamine crude product; then adding the crude product into a rectifying tower, and extracting a high-purity N-methyldiisopropanolamine product from a side line at the middle upper part; the used catalyst is citric acid modified zeolite loaded copper-chromium bimetal. According to the production method disclosed by the invention, by optimizing an active site structure and a rectification separation path of the catalyst, efficient and stable operation of a reaction process is realized, and the thermal stability of a final product is remarkably improved.

The present application relates to a kind of carbon dioxide mineralization method and carbon dioxide mineralization device.The carbon dioxide mineralization method includes the following steps: mixing absorption liquid and industrial solid waste at room temperature, obtain mortar;Make mortar solid-liquid separation, obtain clear liquid and thick slurry;Carbon dioxide in flue gas is absorbed by clear liquid, obtain carbon-rich absorption liquid;Carbon-rich absorption liquid and thick slurry occur mineralization reaction at 180 DEG C-220 DEG C, obtain mineralized slurry;Make mineralized slurry solid-liquid separation, obtain mineralized ash and mineralized clear liquid;Wherein, absorption liquid includes inorganic base and organic base, organic base includes monoethanolamine, diethanolamine, triethanolamine, 3-methylaminopropylamine, N-methyl diethanolamine, piperazine, diethylene triamine, triethylene tetramine, tetraethylene pentamine and 2-amino-2-methyl-1-propanolamine at least two kinds.The method greatly improves CO2 capture rate and CO2 utilization rate, and organic base consumption is less, absorption liquid regeneration energy consumption is low, and overall economy is good.

The presently claimed invention relates to an alkaline composition for cleaning a substrate comprising i) copper or copper alloy and ii) cobalt or cobalt alloy, the composition comprising: a) at least one pH adjustor selected from diglycolamine, 4,4-diethoxy-N,N-dimethyl-1-butanamine, 3-dimethylaminopropan-1-ol, dimethylaminoethoxyethanol, N,N-dimethylisopropanolamine, ethylethanolamine, N-methyldiethanolamine, 2-(2-(methylamino)ethoxy)ethanol, 3-(methylamino)propane-1,2-diol, 2-[2-[2-(2-methoxy- ethoxy)ethoxy]ethoxy]ethylamine, 2-[2-(2-aminoethoxy)-ethoxy]-ethanol, N-butyldiethanolamine, diisopropanolamine, N-methyldiisopropanolamine, monoethanolamine, 3-dimethylamino-1,2-propandiol, 2- amino-1-butanol, 2-(2-(2-(2-aminoethoxy)ethoxy)ethoxy)ethanol, prolinol, 1-methyl-2-pyrrolidinemethanol, 1-methyl-2-pyrrolidinemethanol, 1-methyl-3-pyrrolidinol, 2-amino-2-methyl-1-propanol, N,N-dimethylethanolamine, butylethanolamine, diethylethanolamine, 3-methoxypropylamine, 4-(2-hydroxyethyl)morpholine, 4-(dimethylamino)cyclohexanol, 2-amino-2-methyl-1, 3-propanediol, or diisopropylamine; b) at least one complexing agent selected from C2 to C12 hydrocarbon having at least two sulfonic acid or carboxylic acid groups; c) at least one polymeric dispersing agent having a weight average molecular weight ≥ 1000 g / mol; and d) a solvent comprising water.

The invention discloses a clay stabilizer for a polymer dry powder direct distribution variable-viscosity fracturing fluid. The clay stabilizer is prepared from quaternary ammonium salt, an alcohol amine compound and a polyamine compound as raw materials in a solvent. The quaternary ammonium salt is quaternary ammonium salt with the carbon chain length of C12-C18; the alcohol amine compound is selected from at least one of ethanolamine, dimethyl propanolamine, hydroxyethyl piperazine, piperidine, isopropanolamine, triisopropanolamine, aminomethyl propanolate, hydroxyethyl ammonium salt and the like; the polyamine compound is selected from any one of poly dimethyl diallyl ammonium chloride, polyquaternary ammonium salt, poly allylamine, polyurea, polybutanediamine, polyethyleneimine, polyethylene polyamine and a polyethyleneimine cross-linked substance. The clay stabilizer disclosed by the invention is particularly suitable for polymer dry powder direct distribution variable-viscosity fracturing fluid, the stability of clay can be remarkably improved, particularly, excellent inhibition performance can still be kept under high-temperature and high-salt conditions, stratum damage is reduced, and the application requirements in complex environments of oil fields are met.

The invention discloses a method for deeply converting CO2 into acetaldehyde and crotonaldehyde, and belongs to the technical field of conversion of acetaldehyde and crotonaldehyde, and the method comprises the following steps: S1, taking one or a mixture of more of melamine, urea and dicyandiamide as a precursor, dissolving the precursor in an aqueous solution under a heating condition, and uniformly stirring until the precursor is completely dissolved; s2, adding one or more of deprotonation agents including triethylamine, isopropanolamine, 1-methylimidazole, n-butylamine, pyridine and tetramethylammonium hydroxide, mixing, and uniformly stirring; s3, placing in a hydrothermal reaction kettle, reacting under given temperature and time conditions, and cooling to room temperature; s4, carrying out centrifugal washing, drying and calcining to obtain polymeric carbon nitride with a crystal / amorphous interlaced interface; according to the method, other hydrogenation steps of the intermediate in the CO2 conversion process are inhibited, and on the basis of high yield and selectivity of acetaldehyde, C-C chain growth is further carried out to generate crotonaldehyde.

The invention provides copper paste for low-temperature air heterogeneous bonding as well as a preparation method and application of the copper paste. The copper paste comprises the following components in percentage by mass: 58-66wt% of surface-modified copper nanoparticles, 12-14wt% of soldering flux and 20-30wt% of an organic solvent, the surface modified copper nanoparticles are obtained by mixing Cu (CH3COO) 2, a stabilizer and a reducing agent and then stirring and reacting under a water bath heating condition; the stabilizer is prepared from at least one of Arabic gum, pyridine, 2-pyridinemethanol, isopropanolamine and 2-hydroxyethyl pyridine; the reducing agent comprises at least one of L-ascorbic acid, salicylic acid and serine; the organic solvent comprises at least one of propyl alcohol, glycerol, methanol and ethylene glycol. A connector obtained by sintering the copper paste is a compact welding connector, the welding quality is high, the mechanical property is good, and the connection strength is far higher than that of current mainstream Sn-based brazing filler metal.

The application belongs to the technical field of organic synthesis, and particularly relates to N-Boc-L-propanolamine and a preparation method and application thereof. The preparation method of the N-Boc-L-propanolamine comprises the following steps: (1) preparing N-Boc-propanolamine: reacting raw material 2-amino propanol with Boc anhydride to obtain N-Boc-propanolamine; (2) synthesizing N-Boc-L-propanolamine: dispersively dissolving N-Boc-propanolamine obtained in step (1), adding hydroxyl oxidase and a pH buffer system, and passing in oxygen, so that N-Boc-propanolamine is reacted with the hydroxyl oxidase; after the reaction is completed, extraction, filtration, alkali washing, concentration, crystallization and drying are performed to obtain the N-Boc-L-propanolamine. The preparation method has the advantages of easy availability of raw materials, low price, simple operation, high product yield and easy industrial production.

The application discloses an engineered decarboxylase polypeptide and a method for preparing isopropanolamine, which can synthesize isopropanolamine from L-threonine or a fermentation broth containing L-threonine by using the engineered decarboxylase polypeptide. Compared with a naturally occurring wild-type decarboxylase, the engineered decarboxylase polypeptide has improved properties, such as increased enzyme activity, increased thermal stability, good substrate tolerance and the like. The reaction conditions tolerated by the engineered decarboxylase polypeptide are more relaxed, and the reaction is more conducive to scale-up. The method for preparing isopropanolamine provided by the application can avoid the process of flammable and explosive toxic epoxide compounds or ammonia under high temperature and high pressure, greatly saves energy and equipment investment, and does not contain the classic diisopropanolamine, triisopropanolamine and polyether impurities in chemical synthesis, and has important industrial application value.

The present invention relates to an improved process for the preparation of oxaborole derivatives which are used as agents in the treatment of mild-to-moderate atopic dermatitis. The present invention specifically relates to an improved process for the preparation of crystalline forms of Crisaborole. The present invention specifically relates to an improved process for the preparation of crystalline forms of Crisaborole (Form II) through crisaborole propanolamine salt. The present invention specifically relates to an improved process for the preparation of highly pure Crisaborole through crisaborole propanolamine salt.

The present invention is within the technical field of pain-relief and relates to a pharmaceutical composition comprising at least one anesthetic agent selected from the group consisting of ropivacaine, bupivacaine, etidocaine, levobupivacaine, lidocaine, lignocaine, mepivacaine, articaine, dibucaine, levobupivacaine, prilocaine, benzocaine, chloroprocaine, cocaine, procaine, proparacaine, tetracaine and any pharmaceutically acceptable salt, hydrate, solvate or prodrug thereof; at least one alkanolamine selected from the group consisting of triethanolamine, tripropanolamine and trimethanolamine; water; and optionally a pharmaceutically acceptable diluent, carrier and / or excipient. The present disclosure furthermore relates to the use of the composition for providing pain-relief, a method of treatment, a method of producing said pharmaceutical composition as well as a carbon quantum dot formed from components of the pharmaceutical composition.

There is provided a composition for use as an additive to enhance the strength of a cementitious composition, the composition comprising: an alkanolamine comprising ethanol diisopropanolamine (EDIPA) and optionally at least one selected from the group consisting of triisopropanolamine (TIPA), diethanol isopropanolamine (DEIPA), triethanolamine (TEA), and tetra-(2-hydroxyethyl) ethylenediamine (THEED); at least one retarder selected from the group consisting of gluconate, sucrose, corn syrup and molasses; and at least one accelerator selected from the group consisting of thiocyanate, sodium chloride and calcium chloride wherein the alkanolamine and the accelerator are present in a mass ratio of 0.2 to 4.0 and the accelerator and the retarder are present in a mass ratio of 1 to 10. When hydrated, the additive enhances the short-term and long-term strength of the cement.

The present invention relates to a method for activating ground granulated blast furnace slag (GGBS) with an admixture comprising triethanolamine and diethanolisopropanolamine. The present invention also relates to an admixture comprising triethanolamine and diethanolisopropanolamine. The present invention also relates to a hydraulic binder composition comprising GGBS, optionally Portland cement, triethanolamine, and diethanolisopropanolamine.

To provide a concrete composition capable of obtaining a hardened body relatively excellent in development of initial strength without performing steam curing under a winter environment, a method for producing the concrete composition, and a precast concrete product.SOLUTION: The concrete composition includes cement, water, fine aggregate, coarse aggregate, glycerin and an accelerator, wherein the accelerator is one or more selected from calcium chloride, sodium carbonate, sodium thiosulfate, triethanolamine, diethanolisopropanolamine, triisopropanolamine and aluminum sulfate.SELECTED DRAWING: None