cas 15520-10-2, 1,5-DIAMINO-2-METHYLPENTANE

Articles about 15520-10-2Total 9 be found

Method for preparing 2-methyl pentamethylene diamine
The invention provides a brand-new method for preparing 2-methyl pentamethylene diamine. Ni-Al hydrotalcite loaded Ir is used as a catalyst, a fixed bed is used as a reactor, ammonium formate is used as a hydrogen source and an ammonia source for reaction, and acetaldehyde and methacrylonitrile are converted into 2-methyl pentamethylene diamine by a one-pot method in the presence of a solvent and under a certain temperature condition. The method for preparing the 2-methyl pentamethylene diamine provided by the invention has the advantages of mild reaction conditions, simple operation process, far higher selectivity of the target product than that of the traditional preparation method, less three wastes and easy product separation, and can realize continuous production, and has an industrial application potential; and meanwhile, the used catalyst is simple in preparation process.
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Paragraph 0070-0074

(2021/09/22)

PROMOTER FOR SELECTIVE NITRILE HYDROGENATION
Disclosed is a process for hydrogenating a dinitrile comprising contacting the dinitrile with hydrogen over catalyst comprising at least 90 wt.% iron in the presence of promoter comprising at least one selected from alkali metal and alkaline earth metal promoters.
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Paragraph 00100-00101

(2017/09/08)

Stable and Inert Cobalt Catalysts for Highly Selective and Practical Hydrogenation of C≡N and C=O Bonds
Novel heterogeneous cobalt-based catalysts have been prepared by pyrolysis of cobalt complexes with nitrogen ligands on different inorganic supports. The activity and selectivity of the resulting materials in the hydrogenation of nitriles and carbonyl compounds is strongly influenced by the modification of the support and the nitrogen-containing ligand. The optimal catalyst system ([Co(OAc)2/Phenα-Al2O3]-800 = Cat. E) allows for efficient reduction of both aromatic and aliphatic nitriles including industrially relevant dinitriles to primary amines under mild conditions. The generality and practicability of this system is further demonstrated in the hydrogenation of diverse aliphatic, aromatic, and heterocyclic ketones as well as aldehydes, which are readily reduced to the corresponding alcohols.
Chen, Feng,Topf, Christoph,Radnik, J?rg,Kreyenschulte, Carsten,Lund, Henrik,Schneider, Matthias,Surkus, Annette-Enrica,He, Lin,Junge, Kathrin,Beller, Matthias
supporting information
p. 8781 - 8788
(2016/08/02)

METHOD FOR MAKING 2-METHYLPENTAMETHYLENEDIAMINE AND ADIPONITRILE WITH HOT AMMONIA SWEEP
Disclosed is a process for extending the useful life of a hydrogenation catalyst for making diamines in which 2-methylglutaronitrile and adiponitrile are charged separately to the catalyst in sequence with an intervening step of contacting the catalyst with hydrogen and ammonia at elevated temperature.
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Paragraph 0063-0072

(2015/02/19)

PREPARATION OF METHYLPENTAMETHYLENEDIAMINE AND METHYLPIPERIDINE
Methyl-2-pentamethylenediamine and methyl-3-piperidine are prepared by hydrogenation of methylglutaronitrile in the presence of a catalyst including cobalt, chromium, and nickel, especially a catalyst based on Raney cobalt doped with nickel and chromium.
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Page/Page column 2

(2011/02/26)

IONIC LIQUIDS AS ELECTROLYTES
The invention relates to an ionic liquid composition and a method for preparing the ionic liquid. The ionic liquid comprises a cation containing the FormulaI, disclosed, and wherein: n is 1 or 2, R1 is selected from the group consisting of: H, C1 - C12 alkyl, aryl or together with R2 may form a heterocyclic ring, and R2 is selected from the group consisting of: H, C1 - C12 alkyl, aryl or together with R1 may form a heterocyclic ring, and R3 is selected from the group consisting of hydrogen and C1-C12 alkyl, wherein if n is 1, then R3 is C1-C12 alkyl; and wherein R1 and R2 are not simultaneously selected from hydrogen. The method for the preparation of the ionic liquid composition provided herein starts with at least one N-substitution of the compound of Formula II, as herein disclosed, and wherein: n is 1 or 2, R3 is selected from the group consisting of hydrogen and C1-C12 alkyl, wherein if n is 1, then R3 is C1-C12alkyl. Further provided is a use of the ionic liquid in a chemical method including at least a method for electro-chemical oxidation.
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Page/Page column 18

(2009/01/24)

Method for the preparation of maleimides
In accordance with the present invention, there are provided improved methods for the preparation of maleimide monomers. This new method for the synthesis of maleimides is clearly superior to those documented in the prior art. Furthermore, the invention method utilizes materials with reduced toxicity, thus the overall process has a minimal impact on the environment. Thus, in accordance with the present invention, it has been discovered that certain amine salts can be successfully used to replace the polar, aprotic solvents cited in the prior art for the cyclodehydration of maleamic acids. The use of these salts provides competitive reaction times and product yields relative to results obtained with the polar, aprotic solvents. These salts have the advantage of having no vapor pressure and, therefore, have no possibility to co-distill with the water produced by the cyclodehydration reaction. Furthermore, such salts can be tailored to have desirable solubility characteristics (i.e., soluble in the refluxing azeotropic solvent, but insoluble at room temperature) that permit their easy removal from the reaction product. Such salts are not destroyed during the cyclodehydration reaction and, therefore, can be efficiently recycled again and again.
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(2008/06/13)

Multistep, continuous preparation of organic polyisocyanates
A multistep process for the continuous preparation of organic polyisocyanates, preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to give monomeric polyurethanes and pyrolyzing the latter involves separating the resultant polyisocyanates and worthless residues in certain reaction steps and recycling the reusable by-products into earlier steps.
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(2008/06/13)

Preparation of 2-methyl-1,5-diaminopentane
There is disclosed a process for the preparation of 2-methyl-1,5-diaminopentane by a multi-stage hydrogenation of α-methylene glutaronitrile using as a catalyst a highly dispersed form of nickel in which the first stage hydrogenation is conducted at temperatures ranging from about 20°C to about 50°C and a hydrogen pressure of at least about 14 kilograms per square centimeter and the second stage hydrogenation is conducted at temperatures ranging from about 120°C to about 140°C using a hydrogen pressure of at least about 42 kilograms per square centimeter.
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(2008/06/13)