19 results about "Cyclohexylamines" patented technology

The present application relates to a kind of catalyst and its preparation method, the refining method of aniline, wherein the catalyst includes core and shell, the core includes acidic microporous-mesoporous composite molecular sieve and metal oxide loaded on the molecular sieve, the shell includes hydrophobic porous carrier layer and metal element loaded on the porous carrier layer.The catalyst of the present application can promote the conversion of cyclohexylamine and phenol in aniline into macromolecule, high-boiling substance, which can be quickly removed by simple rectification subsequently, finally realizing the synchronous efficient removal of phenol and cyclohexylamine, significantly improving the quality of aniline, while reducing the energy consumption of refining system and aniline loss, and no new impurities are introduced throughout.

The invention relates to the technical field of tin alloy solder, and discloses a preformed soldering lug with high welding strength, which comprises a soldering flux layer and a soldering lug main body, the soldering flux layer comprises esterified rosin, methyl ester, succinic acid, glutaric acid, cyclohexylamine hydrochloride and isopropanol; the soldering lug main body comprises tin, antimony, silver, bismuth, copper and nickel; by adding silver, bismuth, copper, nickel and metal elements in the alloy into the soldering lug, the mechanical strength of the solder alloy can be improved, compared with common tin-copper alloy, the mechanical strength of the soldering lug is greatly improved, the soldering flux is high in activity but low in corrosivity, stable high-mechanical-strength intermediate layer alloy is formed, and the soldering flux can be applied to the field of soldering. The welding strength and the tensile strength are more excellent, the soldering flux layer and the soldering lug main body have the synergistic effect, so that a welded part has high tensile property after being welded, and the mechanical strength of the solder alloy can be improved by adding silver, bismuth, copper and nickel in the alloy into the soldering lug and metal elements.

This invention relates to the field of chemical waste gas resource utilization and environmental protection technology, specifically disclosing a cyclohexylamine hydrogen-containing waste gas recovery and reuse treatment system. It includes pretreatment, separation and purification, regeneration, closed-loop control, and recycling units connected in series, forming a closed loop through corrosion-resistant and heat-insulated pipelines. The pretreatment unit uses a composite absorbent to deeply remove impurities such as ammonia and organic amines from the waste gas; the separation and purification unit uses a composite membrane, functionalized adsorption tower, and PSA module for gradient hydrogen separation; the regeneration unit realizes the recycling of the composite absorbent; the closed-loop control unit adjusts parameters in a coordinated manner; and the recycling unit reuses high-purity hydrogen for production. This invention achieves thorough impurity removal, high hydrogen purity, high recovery rate, recyclable absorbent, and low energy consumption, effectively solving the technical problems of incomplete hydrogen-amine separation, easy adsorbent poisoning and deactivation, and insufficient hydrogen purity in traditional technologies, thus realizing waste gas resource utilization and green production.

The application discloses MCM-22 molecular sieve, a preparation method and application thereof. The application adopts a small amount of N,N,N-trimethyladamantylammonium and cyclohexylamine dual organic structure directing agents in a hydrothermal synthesis system, and synthesizes MCM-22 molecular sieve through one-step crystallization and calcination. The method can directly synthesize MCM-22 molecular sieve without adding seeds and without temperature change crystallization operation, and the yield of the MCM-22 molecular sieve prepared after calcination is high. The content of non-framework aluminum in the MCM-22 molecular sieve prepared by the preparation method is less than 5% of the total aluminum content, the content of aluminum located at the half-supercage T2 site of the framework is higher than 10% of the total aluminum content, and the MCM-22 molecular sieve has good performance when used as a catalyst for a liquid phase alkylation reaction of benzene and ethylene to prepare alkylbenzene.

The application provides a refining method of cyclohexylamine and a preparation method of cyclohexylamine, the refining method of cyclohexylamine is that a reaction liquid containing cyclohexylamine is removed of light components and then is introduced into a refining tower for refining, carbon dioxide is introduced into the refining tower, and the preparation method of cyclohexylamine is characterized in that the method comprises the following steps: a PS1 activation step, in which a catalyst is activated by using hydrogen containing a small amount of water; a PS2 reaction step, in which after the activation is completed, raw material aniline and hydrogen are mixed and preheated, and then are introduced into a reactor for hydrogenation reaction to obtain a cyclohexylamine reaction liquid; and a PS3 reaction step, in which the refining method is used for refining. The catalyst is activated by using hydrogen containing a small amount of water, so that the activity of the catalyst can be significantly improved, and the yield of cyclohexylamine is high; in the product refining process, a small amount of carbon dioxide is introduced into the bottom of the refining tower, so that N-cyclohexylidene cyclohexylamine impurities can be effectively removed, and the purity of the product is high.

The application provides a kind of polyamide and its preparation method and application, the polyamide includes diamin residue and diacid residue;The diamin residue includes 2,2'-dimethyl-4,4'-methylene bis (cyclohexylamine) residue;The diacid residue includes 1,4-cyclohexane dicarboxylic acid residue and 1,12-dodecyl diacid residue;With the total molar amount of diacid residue as 100mol%, the molar percentage content of 1,4-cyclohexane dicarboxylic acid residue is 14~29mol%.The polyamide has excellent UV aging resistance and toughness, while it can also maintain high light transmittance and low haze, can meet the strict demand of high-end glasses market for material long-term beauty and durability.

This invention provides a method for the deep reduction of phenazine waste residue. The phenazine waste residue generated during RT-PS production is hydrogenated and reduced to cyclohexylamine using a supported nickel catalyst. This invention, through deep reduction, converts phenazine, azobenzene, aniline, and other components in the phenazine waste residue into cyclohexylamine, solving the problem of difficult disposal of phenazine waste residue and realizing its resource utilization. This significantly reduces waste residue emissions during RT-PS production.

The application provides a method for separating and purifying a peroxidized dicyclohexylamine pyrolysis reaction liquid, which comprises the following steps: (1) the peroxidized dicyclohexylamine pyrolysis reaction liquid is cooled and separated into an oil phase and a water phase; (2) the water phase is sequentially subjected to acidification and solid-liquid separation to obtain crude 11-CUA and an acidified liquid phase; the crude 11-CUA is subjected to molecular distillation; the acidified liquid phase is sequentially subjected to membrane concentration, and the concentrated water obtained is subjected to first rectification to obtain a byproduct; and the oil phase is sequentially subjected to removal of an organic solvent, thin film evaporation-rectification coupling treatment and molecular distillation to obtain 11-CUA. The application has the advantages of no need of reaction crystallization, a short process flow, less waste, high yield and purity of 11-cyanoundecanoic acid and wide application prospect.

This invention relates to the field of pharmaceutical analysis technology, and provides a method for detecting N-methylcyclohexylamine hydrochloride in bromhexine hydrochloride. The method involves dissolving N-methylcyclohexylamine in an organic solvent as a reference solution, and dissolving bromhexine hydrochloride in an organic solvent containing an acid-binding agent as the test solvent, followed by headspace gas chromatography for detection. This method is simple, efficient, specific, sensitive, repeatable, and stable, and can be used for the quality control of bromhexine hydrochloride raw material, providing technical support for its production.

This invention discloses a method for synthesizing bromhexine hydrochloride, with the following specific steps: Step (1), using 2-amino-3,5-dibromobenzoic acid as a raw material, reacting it with trimethylacetyl chloride via an anhydride method under the action of an acid-binding agent to obtain compound 2-amino-3,5-dibromobenzoic acid anhydride; Step (2), the 2-amino-3,5-dibromobenzoic acid anhydride obtained in Step 1 undergoes nucleophilic addition with N-methylcyclohexylamine to obtain compound 5, bromhexine hydrochloride intermediate; Step (3), the above compound 5, bromhexine hydrochloride intermediate undergoes amide reduction and salt formation reaction to obtain bromhexine hydrochloride. This process provides a new route for preparing bromhexine hydrochloride, avoiding the heavily regulated chlorination process, reducing the release of toxic gases from strong halogen reagents such as thionyl chloride, significantly reducing safety risks and environmental protection investment, and the reaction itself is safe and fast, which is conducive to industrial production.

Methods for stereoselectively crystallizing 3-keto-5β-cholanic acid (“3-KCA”) and 3-ketoursodeoxycholic acid (“3-KUDCA”) of extremely high purity, salts for carrying out such methods, particularly tert-butylamine and cyclohexylamine salts of 3-KCA, tert-butylamine salts of 3-KUDCA, and crystalline forms of these salts, as well as methods for preparing commercial steroid compounds from these purified materials.

This invention provides a high-calorific-value, high-flash-point bio-liquid fuel and its preparation method, comprising the following raw materials: bio-based butanol, ethylene glycol, dimethyl carbonate, butanone, cyclohexylamine carbonate, and methyl acetate, in the following mass percentage proportions: bio-based butanol 60-75%, ethylene glycol 5-10%, dimethyl carbonate 15-20%, butanone 0.5-1.0%, cyclohexylamine carbonate 2.0%-6.0%, and methyl acetate 5-10%. The high-calorific-value, high-flash-point bio-liquid fuel and its preparation method provided by this invention have the characteristics of high calorific value, high flash point, high freezing point, stable flame combustion, clean and smokeless operation, and high safety in storage tank transportation and use.

The application discloses a method for preparing cyclohexylamine by catalytic reduction and amination of phenol, which takes lignin-derived phenol as raw material, takes ammonia as ammonia source, takes water as solvent, and is prepared by reaction in a hydrogen atmosphere under the action of a supported bimetallic multifunctional catalyst. The catalyst takes SAPO-5 as a carrier, and effective active ingredients include oxides of ruthenium and manganese. The method for preparing cyclohexylamine is green and environmentally friendly, has low production cost, high product yield, high catalyst activity and recycling, and has obvious industrial production advantages.

This application relates to the field of fine chemicals, specifically disclosing an alicyclic aminosilane compound and its preparation method. The alicyclic aminosilane compound has the structural formula R1R2R3Si-NH-Cy-CH2-Cy-NH-SiR1R2R3; wherein R1, R2, and R3 are each independently selected from C1-C6 alkyl, C6-C10 aryl, or R1, R2, and their attached silicon atoms together form a cyclic silazane structure containing 2-5 silicon atoms; Cy represents a substituted or unsubstituted cyclohexyl group. The preparation method of this compound includes: reacting 4,4'-methylenebiscyclohexylamine or its salt with a silane compound in the presence of an inert gas and an organic solvent at a temperature between 0°C and the reflux temperature of the organic solvent; after the reaction, post-treatment yields the target product. The product structure of this application is novel, and the synthesis method is simple, filling the gaps in existing technologies for synthesizing alicyclic aminosilane compounds.

This invention relates to the field of natural product extraction technology, and discloses a method for extracting pectin and protein from sunflower discs, comprising the following steps: S1, hydrophobic matrix construction: fresh sunflower discs are pulverized and dispersed in N,N-dimethylcyclohexylamine, hydrophobic Schiff base ligands and β-cyclodextrin are added, and the mixture is homogeneous at 20℃-30℃ and 0.1MPa to obtain a hydrophobic mixed slurry; S2, phase change extraction and in-situ chelation: carbon dioxide gas is introduced into the hydrophobic mixed slurry, and the system pressure is maintained at 0.3MPa to 0.6MPa; S3, microemulsion fractionation; S4, product recovery. By directly using fresh sunflower discs as raw materials and utilizing the hydrophobic properties of N,N-dimethylcyclohexylamine to exchange cell water in situ at room temperature and pressure, an anhydrous hydrophobic matrix is ​​constructed, preserving the nitrogen solubility index and bioactivity of sunflower disc proteins, while maintaining the natural molecular structure of pectin.

This invention relates to the field of flux technology, and more particularly to an environmentally friendly flux material and its preparation method. The aforementioned environmentally friendly flux material comprises, by weight, the following raw materials: 1-3 parts polymeric rosin, 1-2 parts carboxyl-terminated polyamide amine, 1-3 parts hydrogenated rosin glycerol ester, 3-5 parts alicyclic epoxy acrylate, 0.01-0.3 parts 4,4'-methylenebis(cyclohexylamine), 0.5-1 parts nano-silica, 1-3 parts organic acid activator, 0.5-1 part corrosion inhibitor, 1-2 parts surfactant, 1-2 parts film-forming agent, 5-10 parts ester solvent, 1-5 parts alcohol solvent, and 5-10 parts water. This invention maintains excellent performance at lead-free soldering temperatures, meeting the venting requirements of high-density circuit boards, ensuring uniform distribution of flux residues, and achieving performance optimization through component interaction. The preparation process is simple.

This invention discloses a MWW molecular sieve, its preparation method, and its applications. The molecular sieve of this invention has a schematic chemical composition as shown in the formula "mSiO2·nAl2O3·pSDA1·qSDA2", where 20≤m / n≤35, 51≤m / p≤1000, 0.05≤p / q≤0.60, SDA1 is N,N,N-trimethyladamantane ammonium, and SDA2 is cyclohexylamine. The content of non-framework aluminum in the molecular sieve is less than 5% of the total aluminum content, and the content of aluminum located at the T2 site of the framework semi-supercage is more than 15% of the total aluminum content.

The present application relates to a kind of super-hydrophobic gas phase corrosion inhibitor coating and its preparation method and application, belong to the technical field of anticorrosive coating.The coating includes super-hydrophobic material BN / GO@SiO2, multi-element gas phase corrosion inhibitor system and epoxy resin;The multi-element gas phase corrosion inhibitor system is composed of sodium benzoate, sodium gluconate and cyclohexylamine carbonate;The present application also provides a kind of preparation method of super-hydrophobic gas phase corrosion inhibitor coating.The super-hydrophobic gas phase corrosion inhibitor coating of the present application is used for the corrosion protection of electronic components.The super-hydrophobic gas phase corrosion inhibitor coating of the present application can be prepared into super-hydrophobic gas phase corrosion inhibitor coating with excellent hydrophobic, heat conduction and insulation after spraying.

The present application relates to the technical field of ethylene-maleic anhydride copolymer, and specifically discloses an ethylene-maleic anhydride copolymer and a preparation method thereof, wherein the ethylene-maleic anhydride copolymer is synthesized by using ethylene and maleic anhydride, then the copolymer is modified by using cyclohexylamine, n-octylamine and diaminodiphenyl ether, and mixed with branched epoxy prepolymer to form an adhesive, so that the heat resistance, thermal stability, mechanical strength, dimensional stability and long-term durability of the adhesive are improved.