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Chemicals from Olefin Hydrocarbons
Published in James G. Speight, Handbook of Petrochemical Processes, 2019
Hexamethylenediamine (also called 1,6-diaminohexane and 1,6-hexanediamine) also known as hexamethylenediamine (H2N(CH2)6NH2) is a colorless solid, soluble in both water and alcohol. It is the second monomer used to produce nylon 6/6 with adipic acid or its esters. The main route for the production of hexamethylene diamine is the liquid-phase catalyzed hydrogenation of adiponitrile: NC(CH2)4CN+4H2→H2N(CH2)6NH2
Comparative Catalytic Hydrogenation Reactions of Aliphatic Dinitriles over Raney Nickel Catalysts
Published in John R. Kosak, Thomas A. Johnson, Catalysis of Organic Reactions, 2020
Marc Joucla, Philippe Marion, Pierre Grenouillet, Jean Jenck
Heterogeneous catalytic hydrogenation reactions of aliphatic dinitriles are of importance for industrial diamines production. 1,6-Diaminohexane (hexamethylenediamine, HMDA) is mainly used in nylon 66 manufacture and up to 2 MT is produced yearly. Heterogeneous catalytic hydrogenation of adiponitrile is by far the most used industrial route to produce this aliphatic diamine [1].
Development of recoverable adsorbents for Cr(VI) ions by grafting of a dimethylamino group-containing monomer on polyethylene substrate and subsequent quaternization
Published in Environmental Technology, 2023
Kazunori Yamada, Yoshinori Kitao, Hiromichi Asamoto, Hiroaki Minamisawa
Adsorption is a superior process compared to others in terms of the cost, simplicity of design and operation, and availability. Different kinds of polymeric adsorbents have been developed for removal of Cr(VI) ions [6,7]. These are prepared by the functionalization of poly(glycidyl methacrylate) (PGMA) chains with low-molecular-weight or polymeric amine compounds, such as ethylenediamine (EDA) [8,9], hexamethylenediamine (HMDA) [10], triethylenetetramine (TETA) [11,12], and polyethyleneimine (PEI) [13–15], by copolymerisation of an anionic monomer with hydrophilic monomer [16], or by the chemical crosslinking of an amino group-containing polymers, PEI [17] and chitosan [18,19]. However, some of the adsorbents still face the problems of low adsorption capacity, low adsorption rate, and poor regeneration. To solve these problems, we have focused particularly on the use of grafted polymer chains in terms of the fact that only one end of a grafted polymer chain is bonded covalently to the water-insoluble polymer substrate and the other end is not put under restraint. In our previous paper, it was found that the grafting of DMAEMA onto the polyethylene (PE) substrates is a much effective procedure [20]. In addition, the adsorption capacity increased without the increase in the amount of grafted DMAEMA by the two-step grafting of a hydrophilic monomer, 2-hydroxyethyl methacrylate, and DMAEMA [21].
Advances in self-crosslinking of acrylic emulsion: what we know and what we would like to know
Published in Journal of Dispersion Science and Technology, 2019
Sumit Parvate, Prakash Mahanwar
Different acetoacetyl functional monomers such as allyl acetoacetate, acetoacetamidoethyl (meth)acrylate, acetoacetoxybutyl (meth)acrylate, acetoacetoxyethyl (meth)acrylamide, acetoacetamido (meth)acrylamide, acetoacetoxyethyl methacrylate and diamine functional crosslinkers such as ethylenediamine, propylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine have been extensively reported in several patents.[99–102]