64 results about "Cyclododecanone" patented technology

Cyclododecanone (CDON) is prepared by epoxidizing cyclododecene (CDEN) to epoxycyclododecane (CDAN epoxide), and rearranging the CDAN epoxide to CDON to obtain a mixture comprising said CDON and CDEN, wherein CDEN is separated from the CDON-containing mixture and sent to the epoxidation to CDAN epoxide in step a.

Cyclododecanone (CDON) is prepared by epoxidizing cyclododecene (CDEN) to epoxycyclododecane (CDAN epoxide), and rearranging the CDAN epoxide to CDON to obtain a mixture comprising said CDON and cyclododecane (CDAN), wherein CDAN is separated from the CDON-containing mixture and oxidized to CDON.

Provided is a process for efficiently producing laurolactam by simple steps from cyclododecanone and hydroxylamine. This production process comprises the steps of: (a) reacting cyclododecanone with hydroxylamine in an aqueous solution in the presence of an oxime-formation solvent to produce cyclododecanone oxime; (b) separating the reaction mixture obtained after the oxime-forming step into an oil and an aqueous phases and collecting a solution of cyclododecanone oxime of the oil phase; (c) removing a part or all of the oxime-formation solvent and dissolved water from the solution of cyclododecanone oxime which is collected as an oil phase in the oil/aqueous phase separation step, whereby preparing a solution containing a rearrangement solvent to be used in a rearrangement reaction in a later step and the cyclododecanone oxime; (d) producing laurolactam from cyclododecanone oxime by rearrangement reaction using an aromatic-ring containing compound as a rearrangement catalyst; and (e) separating and removing the rearrangement solvent and the rearrangement catalyst from the reaction mixture after the rearrangement step, and purifying the laurolactam.

The invention relates to a production method of dodecalactam with high purity. The method comprises the following steps: carrying out a reaction of cyclododecanone and hydroxylamine, and adding a solvent a to assist the liquid separation; and recovering the remaining cyclododecanone from the oil phase obtained from the liquid separation by vacuum rectification, mixing the solution rich in cyclododecanoxime with concentrated sulfuric acid, carrying out a Beckmann rearrangement reaction, neutralizing the mixed solution with ammonia water after the reaction is finished, performing the liquid separation to obtain dodecalactam a solution, adsorbing impurities by alumina and then adding a solvent b, and cooling and crystallizing the solution in the mixed solvents of a and b to obtain the dodecalactam solid product. The dodecalactam product obtained by the method has high purity and light color, and is suitable for producing high-grade resin materials.

A process for removing a cyclododecanone-rich target fraction (A) from a dehydrogenation mixture (O) comprising low boilers (LB), cyclododecanone (CDON), medium boilers (MB), cyclododecanol (CDOL) and high boilers (HB) is provided. According to the process, substantially pure CDON is obtained via a distillative sequence of two side draw columns connected in series, wherein the sidestream of the primary side draw column is fed into the secondary side draw column. From the top of each of the two side draw columns, a CDON-rich fraction is drawn off, and these are combined to form a target fraction, which is essentially pure CDON.

A process for preparing cyclododecanone by reacting cyclododecene with dinitrogen monoxide, comprising in particular steps (I) and (II):

• (I) preparing cyclododecene by partially hydrogenating cyclododecatriene;
• (II) reacting cyclododecene obtained in (I) with dinitrogen monoxide to obtain cyclododecanone.

The invention provides a method for simultaneously preparing methylallyl alcohol and cyclododecanone. According to the method, cyclohexanol is adopted as a reducing agent to supply activity H, methylacrolein is reduced in the presence of a catalyst and a polymerization inhibitor to obtain methylallyl alcohol and cyclododecanone products. The process has the characteristics of high atom economy, high product yield, mild reaction condition and no pollution.

The invention provides a method for preparation of dodecanedioic acid. According to the method, nitric acid, cyclododecanone and / or cyclododecanol are used as raw materials are production in the form of reaction crystallization in the presence of a catalyst, the concentration of the nitric acid in the reaction process is controlled at 65 to 90wt%, by controlling of the feeding speed and the grain size of the crystallized product, and in-time separation of the dodecanedioic acid solid, the side reaction is reduced, the selectivity of the reaction is increased, and the unit consumption of thenitric acid is reduced. A simple and easy method for recycling of mother liquor acid is provided, and a large-scale nitric acid distillation concentration process can be avoided.

The invention relates to a production method for a heat-insulating flame-resistant material. The production method has the advantages that specific monomers and ratios are adopted, and nano titanium dioxides are coated with polymers by a high-temperature polymerization process, so that agglomeration of nano components in the flame-resistant material is avoided effectively, and dispersity and stability of the nano titanium dioxides in the flame-resistant material are improved; in addition, a synergistic effect is achieved through compounding of modified nano titanium dioxide powder, composite resin, docusate sodium, cyclododecanone, four parts of propylene glycol n-butyl ether and N,N-diethyl aniline, and accordingly, flame resistance and heat insulation of the material are improved greatly; the flame-resistant material acquired according to the specific ratios has various excellent performance such as heat insulation, wear resistance, rigidity, strength and adhesiveness; the production method for the heat-insulating flame-resistant material is simple and easy to operate and the material is easy to produce industrially.

The invention discloses a method for synthesizing cyclododecalactone by catalytic oxidation of cyclododecanone. Cyclododecalactone is synthesized by using a molybdenum-containing compound as a catalyst, cyclododecanone as a raw material, a hydrogen dioxide solution as an oxidizing agent and acetonitrile as a solvent, wherein the molybdenum-containing compound is any one selected from ammonium molybdate, sodium molybdate, sodium phosphomolybdate and molybdenum oxide. With the molybdenum-containing compound used as the catalyst, there is no waste acid treatment or strong acid corrosion, energy conservation and emission reduction are realized and safety is high; with cyclododecanone used as the raw material, no high-temperature reflux reaction is required, and economic benefit and environmental benefit are raised; and by applying the hydrogen dioxide solution as an oxidizing agent, cleanability and safety of an industrial preparation reactions are raised, and environmental pollution is reduced.

The invention discloses applications of L-arginine and a derivative of L-arginine in preparation of cyclododecanoneoxime, and a method used for preparing cyclododecanoneoxime. The derivative of L-arginine comprises one or a plurality of components selected from L-arginine-L-glutamic acid, an L-arginine hydrochloride, and an L-arginine succinate. According to the preparation method, one or more than one components selected from L-arginine and the derivative of L-arginine are taken as auxiliary agents, cyclododecanone is reacted with hydroxylamine sulphate to prepare cyclododecanoneoxime. The auxiliary agents are capable of controlling iron ion content in the reaction system, inhibiting hydroxylamine sulphate decomposition, inhibiting cyclododecylamine generation, and increasing reaction selectivity, and are convenient to separate and recycle.

In the process for producing a cyclododecanone by isomerizing an epoxycyclododecane-containing starting material in the presence of an isomerization reaction catalyst containing lithium bromide and/or lithium iodide, in order to perform the reaction with high efficiency (high reaction rate) and high selectivity and stably produce a high-purity cyclododecanone in industry while maintaining a high-level reaction rate, the epoxycyclododecane-containing starting material is produced by contacting an epoxycyclododecadiene with hydrogen in the presence of a hydrogen-reduction catalyst and has a content of the hydroxyl group-containing cyclododecane compounds contained in the epoxycyclododecane-containing starting material controlled to 5 mol % or less.

Polymers can be prepared from monomers comprising laurolactam, by a process including a. Beckmann rearrangement of cyclododecanone oxime to give laurolactam in the presence of a Beckmann rearrangementcatalyst, b. removal of impurities from the laurolactam to obtain purified laurolactam, and c. polymerization of monomers comprising purified laurolactam. For avoidance of discoloration or yellowingunder ageing conditions, prior to the polymerization, polycyclic substances containing 24 carbon atoms and at least one heteroatom selected from oxygen and nitrogen and having a molar mass between 300and 380 g/mol are limited to 500 ppm, based on laurolactam.

The present invention relates to a process for the preparation of lauryllactam in which a Beckmann rearrangement of cyclododecanone oxime is carried out. Said process is carried out in the gas phase at a temperature of between 180 and 450° C. in the presence of a microporous material having a three-dimensional inorganic main structure composed of tetrahedra connected via a common edge, called zeolite.

The invention discloses a catalyst and a preparation method thereof, and a method for preparing laurolactam through a gas phase rearrangement reaction. The catalyst comprises fluoride modified rare earth doped Al2O3-SiO2-ZrO2 and fluorine-containing sulfonated polyetheretherketone, and the loading capacity of the fluorine-containing sulfonated polyetheretherketone in the catalyst is 20-50wt%, preferably 30-45wt%. When the catalyst is used for catalyzing gas-phase rearrangement of cyclododecanone oxime, the conversion rate of cyclododecanone oxime reaches 99% or above, the selectivity of laurolactam reaches 99.5% or above, the service life of the catalyst reaches 3000h or above, no ammonium sulfate byproduct is produced in the reaction, the mechanical strength of the catalyst is high, and the problems of equipment corrosion and environmental pollution of a traditional liquid-phase rearrangement process are solved.

The invention provides a continuous preparation system and method of cyclododecanone solution oxime. In the system, reaction raw materials cyclododecanone solution and hydroxylamine salt are integrally countercurrent, and the cyclododecanone solution is kept excessive in the whole process, so that the cyclododecanone solution has the effects of both reactants and solvents. A two-stage supergravity reactor is coupled with a phase separator to reinforce an oximation reaction between oil and water, oxime and ketone in an oil phase are separated through rectification after the two-stage reaction, and the separated ketone and a small amount of byproduct imine flow back to a reaction liquid to further inhibit the occurrence of side reactions. According to the method, additional solvents can be omitted, generation of a byproduct imine is effectively avoided, and the utilization rate of raw materials is increased; and through the coupling design of the supergravity reactor and the phase separator, the total production time is remarkably shortened, and the occupied area of the device is reduced.

The invention discloses a method for preparing laurolactam through extraction rearrangement reaction of cyclododecanone oxime, which comprises the steps of (1) adding a cyclododecanone oxime solutionand an acidic catalyst into an extraction kettle in proportion, strongly stirring and mixing in the kettle to extract cyclododecanone oxime from a solvent phase to a catalyst phase, wherein the solution is liquid-liquid biphase in the reaction kettle, and the reaction is carried out in a catalyst phase; (2) removing extraction reaction heat and part of rearrangement reaction heat from the materialin the extraction kettle through an outer circulating pump and an outer circulating cooler, wherein one strand of material is led out from an outlet of the outer circulating pump to serve as feed ofa rearrangement kettle, and the other strand of material is led out from an outlet of the outer circulating cooler to serve as an inlet medium of a heat transfer inner coil of the rearrangement kettle; and (3) mixing the outlet material of the coil pipe in the rearrangement kettle with the outlet material of the outer circulating cooler of the extraction kettle, feeding the mixture into the extraction kettle, and feeding the rearrangement kettle material into a downstream neutralization process. The heat transfer mode is small in temperature difference in the rearrangement kettle, materials can be effectively prevented from being supercooled, and the conversion rate of reaction materials is guaranteed.