34results about "Amino compound preparation by disproportionation" patented technology

The present invention provides catalyst compositions useful for transamination reactions. The catalyst compositions have a catalyst support that includes transitional alumina, use a low metal loading (for example, less than 25 wt. %), and do not require the presence of rhenium. The catalyst compositions are able to advantageously promote transamination of a reactant product (such as the transamination of EDA to DETA) with excellent activity and selectivity, and similar to transaminations promoted using a precious metal-containing catalyst.

Problems on catalyst production and catalyst performance with respect to conventional 8-oxygen-membered ring micropore-containing crystalline silicoaluminophosphate molecular sieves as non-equilibrium methylamine synthesis catalysts, are resolved. A chabazite type crystalline silicoaluminophosphate molecular sieve having high purity and high crystallinity and having, on a crystal grain surface, an amorphous oxide layer whose Si/Al atomic ratio is greater than that of the whole crystal grain can be stably produced with high yield with the use of a small amount of structure directing agents by the present method characterized in that hydrothermal treatment conducted in the production of 8-oxygen-membered ring micropore-containing crystalline silicoaluminophosphate sieves is controlled under specified treating conditions. The thickness and composition of the amorphous oxide layer, which exert marked influence on the yield of dimethylamine synthesis, can be easily controlled and reproduced under the conditions of catalyst synthesis according to the invention. Thus, the catalyst of high performance can be stably supplied by the present invention at a low cost with reduced output of waste.

Process for preparing tri-n-propylamine (TPA), wherein di-n-propylamine (DPA) is reacted in the presence of hydrogen and a copper-comprising heterogeneous catalyst.

An integrated process for preparing TPA, which comprises the following operations:

• I) reaction of n-propanol with ammonia in a reactor in the presence of an amination catalyst and optionally hydrogen to form a mixture of mono-n-propylamine, DPA and TPA,
• II) separation of unreacted ammonia, unreacted n-propanol and possibly hydrogen from the reaction product mixture and recirculation of at least the ammonia and propanol to the reactor in I) and also separation of the n-propylamine mixture by distillation and isolation of the TPA,
• III) reaction of the DPA obtained in the separation by distillation in II) in a reactor in the presence of hydrogen and a copper-comprising heterogeneous catalyst to form TPA and
• IV) feeding of the reactor output from III) to operation II).

A process for preparing high molecular weight acyclic polyamines comprising providing a reaction mixture that includes at least a first component comprising a first organic, nitrogen-containing compound that contains at least two non-tertiary amine groups separated from one another by a ternary or higher carbon atom spacing that can be transaminated in the presence of a hydrogenation/dehydrogenation catalyst to form a mixture of higher molecular weight, acyclic polyamines while minimizing the formation of cyclic polyamines.

The invention discloses a load type catalyst, which utilizes roasted gama-alumina as a carrier. An active component is loaded on the carrier to obtain the load type catalyst. The active component is composed of nickel, copper, iron and platinum. The weight sum of the nickel, the copper, the iron, the platinum and the roasted gama-alumina is the total weight. The nickel occupies 15% to 25% of the total weight, the copper occupies 5% to 12% of the total weight, the iron occupies 0.5% to 1% of the total weight, and the platinum occupies 0.5% to 1% of the total weight. A preparation method of the load type catalyst and a method for preparing tributylamine by using the load type catalyst are further disclosed. Butylamine and dibutylamine are mixed in a mixed cylinder to obtain mixed liquid, the mixed liquid is gasified and then passes through a fixed bed reactor containing an activated load type catalyst, catalyst reaction is conducted under the hydrogen condition, and a product is collected after condensation to obtain the tributylamine.

The invention discloses a loading-type catalytic agent for synthesizing N-butylethylamine. Gamma-alumina after roasting serves as a carrier, active components composed of Cu and Ni are loaded on the carrier, sum of weight of the Cu, the Ni and the gamma-AI2O3 after roasting is total weight, sum of weight of the Cu and the Ni occupies 25%-38% of the total weight, and ratio of amount of substance of the Cu and the Ni is 0.9-1.5/1. The invention further provides a preparation method of the loading-type catalytic agent. A method for synthesizing the N-butylethylamine by using the loading-type catalytic agent is further provided, ethylamine and the n-butylamine are mixed in a mixing tank to obtain mixed liquor which passes through a fixed bed reactor containing activated loading-type catalyticagent after being vaporized, an amine disproportionated reaction is carried out in a hydrogenation condition, products are collected after condensation, and rectification is carried out to obtain theN-butylethylamine.

The invention discloses a load type catalyst for synthesis of triethylamine. The catalyst comprises the components of the calcined gamma-aluminum oxide (Al2O3) serving as a carrier and active components loaded on the carrier; the active components consist of nickel, copper and palladium; the nickel accounts for 15 to 25 percent of the total weight of the nickel, the copper, the palladium and the calcined gamma-Al2O3; the copper accounts for 5 to 12 percent of the total weight of the nickel, the copper, the palladium and the calcined gamma-Al2O3; and the palladium accounts for 1 to 3 percent of the total weight of the nickel, the copper, the palladium and the calcined gamma-Al2O3. The invention further discloses a preparation method for the load type catalyst. The invention further discloses a method for synthesizing the triethylamine by utilizing the load type catalyst. The method comprises the following steps of mixing ethylamine and diethylamine in a mixed tank to obtain mixed liquid; vaporizing the mixed liquid; performing disproportionated reaction by using a fixed bed reactor containing the activated load type catalyst under the hydrogenation condition; condensing after the reaction is finished; collecting condensation products; and rectifying to obtain the triethylamine.

The invention relates to a catalyst for a reaction for producing diethylenetriamine by means of hydrogenation of ethylenediamine, and a preparation method of the catalyst, aiming at solving the problems that the existing catalyst is low in activity and selectivity. The catalyst takes alumina as a carrier, and contains 0.1-3wt% of one or two or more of rare earth elements, 5-30wt% of one or two ormore of nickel, copper, iron, cobalt, zinc or tin, and 0.1-5wt% of palladium based on the total weight of the catalyst. The catalyst is prepared by firstly coating the carrier with the palladium element and the rare earth elements, and then coating the carrier with the other elements. The catalyst provided by the invention is used for catalyzing the reaction for producing the diethylenetriamine bymeans of the hydrogenation of the ethylenediamine, can obviously improve reaction activity and product selectivity, and has a very high industrial application value.

Processes comprising: providing a starting material comprising ethylenediamine; and reacting the starting material in the presence of a heterogeneous transition metal catalyst to form one or more ethylene amines; wherein the catalyst comprises a catalytically active composition, which prior to treatment with hydrogen, comprises a mixture of oxygen-containing compounds of aluminum, copper, nickel and cobalt; and wherein the catalyst is present as one or more shaped catalyst particles selected from spheres, extrudates, pellets and other geometries, wherein the sphere or extrudate has a diameter of <3 mm, the pellet has a height of <3 mm, and the other geometries have an equivalent diameter L=1/a′ of <0.70 mm, where a′ is the external surface area per unit volume (mm_s²/mm_p³), as defined by

where A_p is the external surface area of the catalyst particle (mm_s²) and V_p is the volume of the catalyst particle (mm_p³).

According to the present invention, a method for producing a catalyst for use in the production of a methylamine compound can be provided, wherein the catalyst comprises a modified crystalline silicoaluminophosphate salt molecular sieve. The method comprises: a moisture control step of adsorbing moisture onto a crystalline silicoaluminophosphate salt molecular sieve in an amount of 5 to 30 wt % of the crystalline silicoaluminophosphate salt molecular sieve; and a step of heating the crystalline silicoaluminophosphate salt molecular sieve having moisture adsorbed thereon under a pressure of 0.1 MPa or more and at a temperature of 130 to 350° C. for 5 to 40 hours.

The invention discloses a method for preparing 4-nitrosoaniline and 4-nitroaniline by reacting nitrobenzene with ammonia under the action of a catalyst. The method is high in conversion rate, good inselectivity and environment-friendly. In addition, the invention further provides a method for preparing p-phenylenediamine by reducing 4-nitrosoaniline and 4-nitroaniline, the yield is high, and separation and purification are not needed.