Disclosed is a method for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine. First, 3-cyano-3,5,5-trimethylcyclohexanone reacts with ammonia to generate 3-cyano-3,5,5-trimethylcyclohexylimine, the 3-cyano-3,5,5-trimethylcyclohexylimine continues to conduct a hydrogenation reaction with hydrogen and ammonia in the presence of a hydrogenation catalyst to convert to 3-cyano-3,5,5-trimethylcyclohexylamine, and after the ammonia is removed from the reaction solution, the reaction solution containing 3-cyano-3,5,5-trimethylcyclohexylamine conducts a hydrogenation reaction for the second time in the presence of hydrogen and a hydrogenation catalyst to generate 3-aminomethyl-3,5,5-trimethylcyclohexylamine. The method decreases reaction pressure, reduces an investment cost, and greatly decreases risks brought by leakage of high-pressure liquid ammonia.
C07C 211/36 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of rings other than six-membered aromatic rings of a saturated carbon skeleton containing at least two amino groups bound to the carbon skeleton
C07C 209/48 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of nitriles
C07C 255/46 - Carboxylic acid nitriles having cyano groups bound to carbon atoms of rings other than six-membered aromatic rings to carbon atoms of non-condensed rings
C07C 253/30 - Preparation of carboxylic acid nitriles by reactions not involving the formation of cyano groups
2.
METHOD OF PREPARING N1-(2-AMINOETHYL)-1,2-ETHYLENEDIAMINE
Disclosed is a method of preparing N1-(2-aminoethyl)-1,2-ethylenediamine by two steps of hydrogenation, comprising (1) adding an iminodiacetonitrile solution and hydrogen to a first hydrogenation reactor, for a first hydrogenation reaction of the iminodiacetonitrile under the action of a first hydrogenation catalyst, so as to obtain a first hydrogenation reaction liquid; and when 80% to 99% of the iminodiacetonitrile has been converted to an intermediate imine, (2) adding the first hydrogenation reaction liquid obtained in step (1) and hydrogen to a second hydrogenation reactor, for a second hydrogenation reaction under the action of a second hydrogenation catalyst and an auxiliary, so as to obtain an N1-(2-aminoethyl)-1,2-ethylenediamine reaction liquid. The conversion rate of iminodiacetonitrile in the method of the present invention can reach 100%.
C07C 211/14 - Amines containing amino groups bound to at least two aminoalkyl groups, e.g. diethylenetriamines
C07C 209/48 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of nitriles
C07D 295/023 - PreparationSeparationStabilisationUse of additives
3.
POLYURETHANE MODIFIER FOR PITCH, PITCH MODIFIED BY SAME AND USE THEREOF
The present invention relates to a polyurethane modifier for pitch, the pitch modified by same and the use thereof. The modifier comprises components capable of forming a polyurethane structure such as polyisocyanates or a prepolymer or multimer terminated with NCO thereof, compounds containing terminal hydroxyl and/or terminal amino groups, an organic polyurethane catalyst, etc., and other components for adjusting properties. The modifier can improve the colloidal structure of pitch, and greatly enhance the properties of the matrix pitch such as heat resistance, temperature sensitivity, etc. The obtained modified pitch has good compatibility, good storage stability, and a stable and long modified effect. Meanwhile, the modifier and the matrix pitch are mixed and processed in a simple procedure at a low processing temperature, thus reducing energy consumption, and being low-carbon and environmentally friendly.
E01C 7/18 - Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
E01C 23/09 - Devices or arrangements for working the finished surfaceDevices for repairing the surface of damaged paving for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removedDevices or arrangements for working the finished surfaceDevices for repairing the surface of damaged paving for cleaning, treating, or filling cuts, grooves, recesses, or fissuresDevices or arrangements for working the finished surfaceDevices for repairing the surface of damaged paving for trimming paving edges
The present invention relates to a method for preparing N-(2-aminoethyl)ethane-1,2-diamine. The method comprises: dissolving iminodiacetonitrile in an organic solvent, adding an OH type anion exchange resin and an iminodiacetonitrile stabilizer, and under the condition that the reaction temperature is 50°C to 150°C and the reaction pressure is 5 Mpa to 25 Mpa, and with the presence of a hydrogenation catalyst and a first additive, performing a hydrogenation reaction with hydrogen, to generate N-(2-aminoethyl)ethane-1,2-diamine. Compared with the prior art, the decomposition of iminodiacetonitrile is restrained, the poisoning factor of the catalyst is eliminated, and characteristics such as long catalyst service life, efficient technique, and high product purity are achieved.
C07C 211/14 - Amines containing amino groups bound to at least two aminoalkyl groups, e.g. diethylenetriamines
C07C 209/48 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of nitriles
Provided is a 3-aminomethyl-3, 5, 5-trimethyl cyclohexylamine preparation method. The feeding flow of 3-cyano-3, 5, 5-trimethyl cyclohexylimine is reacted with NH3 and hydrogen in the presence of a hydrogenation catalyst; the method is characterized by: firstly adding a basic compound to the feeding flow of the 3-cyano-3, 5, 5-trimethyl cyclohexylimine, and then after a portion of the 3-cyano-3, 5, 5-trimethyl cyclohexylimine has reacted, adding an acidic compound to the reaction flow for further hydrogenation reaction to prepare the product. The method ensures that the aminonitrile content in the product is low, thus effectively reducing the duration of the reaction and greatly reducing the consumption of the catalyst during the hydrogenation reaction process.
C07C 211/36 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of rings other than six-membered aromatic rings of a saturated carbon skeleton containing at least two amino groups bound to the carbon skeleton
C07C 209/48 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of nitriles
6.
METHOD FOR INTERMITTENT PREPARATION OF LOW CONTENT TRANS-TRANS ISOMER-CONTAINING 4,4'-DIAMINODICYCLOHEXYLMETHANE
A method for intermittent preparation of 4,4'-diaminodicyclohexylmethane with low content of trans-trans isomer thereof is provided. The method comprises: a) controlling the degree of reaction by stopping the reaction when in the reaction solution excepting the solvent the content of 4,4'-diaminodiphenylmethane is 0-5 wt.% and the content of hexylhydrodiaminodiphenylmethane is 0-20 wt.%; b) separating the reaction liquid obtained from step a) by a conventional separating methods to obtain 4,4'-diaminodicyclohexylmethane with the desired purity.
C07C 211/36 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of rings other than six-membered aromatic rings of a saturated carbon skeleton containing at least two amino groups bound to the carbon skeleton
C07C 209/72 - Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton by reduction of unsaturated amines by reduction of six-membered aromatic rings
7.
CATALYST FOR PREPARING CHLORINE BY OXIDATION OF HYDROGEN CHLORIDE AND PREPARATION THEREOF
The catalyst for preparing chlorine by oxidation of hydrogen chloride and preparation thereof are provided. The catalyst includes carrier and active components, wherein the active components, based on the total weight of the catalyst, are as follows: 1-20wt% of copper, 0.01-5wt% of boron, 0.1-10wt% of alkaline metal elements, 0.1-15wt% of one or more of rare earth elements, 0-10wt% of one or more elements selected from the group consisting of magnesium, calcium, barium, manganese, iron, nickel, cobalt, zinc, ruthenium and titanium. The catalyst can be prepared by two-step impregnation. The catalyst can obviously improve conversion rate and stabilization as compared with existing similar catalysts.
A preparation method of isocyanate by interfacial phosgenation reaction is provided, which comprises the following steps: (a) allowing a solution stream of polyamine having the general formula (II) and a liquid stream of phosgene to flow through the respective mixer, then injecting them into a first-stage reactor at a contact angle of 30-180 degree, such that the solution stream of polyamine and the liquid stream of phosgene are contacted and mixed, and performing phosgenation reaction on the interface; (b) adding the obtained phosgenation liquid in a second-stage reactor, continuously performing the phosgenation reaction to obtain phosgenation liquid containing isocyanate; and (c) separating and purifying the phosgenation liquid containing isocyanate to obtain the isocyanate product.
A jet reactor with dynamic spray nozzle comprises an inner feed pipe (2), an outer feed pipe (3), a gear box (6), a transmission shaft (1) and a transmission linking gear (4). The transmission shaft (1), the inner feed pipe (2) and the outer feed pipe (3) are coaxially arranged from inside to outside. The outer feed pipe (3) and the gear box (6) are connected and coaxially arranged from bottom to top. A gear (7) and a tubular mix-reaction spray nozzle (5) with a plurality of material inlet openings (8) are deployed in the gear box (6). The gear (7) and the spray nozzle (5) are engaged with each other via the material inlet openings (8). The inner feed pipe (2) and the spray nozzle (5) are connected and coaxially arranged from bottom to top. The spray nozzle (5) can be driven by the transmission shaft (1) and the transmission linking gear (4) to rotate axially, thereby driving the gear (7) to rotate. The transmission linking gear (4) can slide up and down in the spray nozzle (5). A method for preparing isocyanates using this reactor is also provided.
B01J 19/26 - Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
C07C 265/14 - Derivatives of isocyanic acid containing at least two isocyanate groups bound to the same carbon skeleton
C07C 263/10 - Preparation of derivatives of isocyanic acid by reaction of amines with carbonyl halides, e.g. with phosgene
10.
METHOD FOR TREATING WASTE SALINE WATER PRODUCED IN PRODUCTION PROCESS OF DIPHENYLMETHANE DIISOCYANATE (MDI)
A method for treating waste saline water produced in production process of diphenylmethane diisocyanate (MDI) involves the following steps: (1) quickly mixing the waste saline water and fresh extractant in a super-gravity rotating bed, and introducing separated waste saline water and fresh extractant into an extraction tower to conduct counter-current extraction after phase separation; (2) introducing the waste saline water discharged from step (1) into a steam stripping tower to conduct steam stripping; (3) transmitting the waste saline water discharged from step (2) into an oxidation reactor together with a chemical oxidant, and introducing air into the reactor to conduct aeration; and (4) sending the waste saline water discharged from step (3) into an absorption tower for an absorption treatment. The method can reduce total organic carbon (TOC) of treated saline water to be less than 8 ppm and total nitrogen (TN) to be less than 2.5 ppm, and recover sodium chloride and water from the waste saline water.
C02F 9/08 - Multistep treatment of water, waste water or sewage at least one step being a physical treatment
C02F 9/02 - Multistep treatment of water, waste water or sewage involving a separation step
C02F 1/20 - Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
C02F 1/26 - Treatment of water, waste water, or sewage by extraction
C02F 1/28 - Treatment of water, waste water, or sewage by sorption
C02F 1/72 - Treatment of water, waste water, or sewage by oxidation
C02F 1/76 - Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
C02F 1/78 - Treatment of water, waste water, or sewage by oxidation with ozone
C02F 103/36 - Nature of the water, waste water, sewage or sludge to be treated from the chemical industry not provided for in groups from the manufacture of organic compounds
11.
JET REACTOR WITH FLOW DUCTS AND PROCESS FOR PREPARING ISOCYANATES USING IT
The present invention provides a jet reactor with flow ducts and a process for preparing isocyanates using it. The jet reactor with flow ducts situates the flow ducts in inner feed pipe which form cyclone and reinforce vortex, thereby amine steam rapidly admixes and reacts with phosgene, and the byproducts are reduced. In addition, the present process uses jet-absorb apparatus which rapidly cools the high temperature gas discharged from the reactor to a temperature at which the product is thermally stable, and at the same time provides negative pressure for the reaction process of the system, and thus saving bulky vacuum system.
C07C 263/10 - Preparation of derivatives of isocyanic acid by reaction of amines with carbonyl halides, e.g. with phosgene
B01J 19/00 - Chemical, physical or physico-chemical processes in generalTheir relevant apparatus
B01J 19/26 - Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
A process for preparation of polymethylene polyphenyl polyamine comprises the following steps: a. mixing and reacting aniline and hydrochloric acid to obtain aniline hydrochloride; b. feeding the aniline hydrochloride to recycle tube and mixing said aniline hydrochloride with the recycling liquid from condensating agitating kettle, then cooling the obtained mixture by heat exchanger; c. feeding the cooled mixture and formaldehyde solution to super-gravitational rotating bed reactor separately, and then mixing and conducting pre-condensating reaction; d. feeding the feed discharged from super-gravitational rotating bed reactor to condensatingagitating kettle to conduct pre-condensating reaction and molecular rearrangement reaction; feeding a part of reaction mixture discharged from condensating agitating kettle to recycle tube as recycling liquid, and discharging another part of reaction mixture as product.
C07C 209/18 - Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups by substitution of hydroxy groups or of etherified or esterified hydroxy groups with formation of amino groups bound to carbon atoms of six-membered aromatic rings or from amines having nitrogen atoms bound to carbon atoms of six-membered aromatic rings
An orifice jet-type injection reactor comprises the parts as following: a first inlet (1a), a second inlet (1b), outer conduit (2), inner conduit (4), jet holes (5), and mixing and reaction area (6). The inner conduit (4) is located inside the outer conduit (2), and an annulus (3) is formed between the lower part of the outer conduit (2) and the inner conduit (4). The first inlet (1a) is connected with the inner conduit to form a main flow passage, and the second inlet (1b) is connected with the annulus. In the lower part of the annulus (3), jet holes (5) are formed on the wall of the inner conduit (4). The zone in the inner conduit (4) below the jet holes is the mixing and reaction area (6). The cross section of the inner conduit (4) is rectangular or similar to that. Rapid mixing and reacting can be realized by the present reactor, and the yield and the quality of the targeted products can be improved.
A hole jet reactor and its use, especially a process for the preparation of an isocyanate by the gas phase reaction of the aliphatic or aromatic di- or tri-amine with phosgene in the reactor. Mixing of the reactants in the reactor is improved such that the probability of producing burble is reduced and the negative pressure generated at the local jet area is eliminated, and the back mixing is reduced and solid by-product is avoided. As a result, the better mix and reactor effect of the high temperature gas phase phosgenation reaction are realized by using the reactor.
C07C 265/14 - Derivatives of isocyanic acid containing at least two isocyanate groups bound to the same carbon skeleton
B01J 19/26 - Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
patents