Nippon Shokubai Co., Ltd.

Kenichi Takematsu

Yoshihisa Oka

Hiroshi Yamamoto

Yoshiaki Hirano

Takehiko Morita

Takafumi Kubo

Yutaka Sugiyama

In the production of aziridines or N-vinyl amides respectively from an alkanolamine or an alkanolamide by the known method comprising a reaction step, a collecting step and/or a condensation step, a purifying step, and a recovering step, this invention is directed toward preventing formation of a solid substance in the vacuum pumps and the vacuum lines. The object of this invention is accomplished by performing the decompression at the purifying step and the decompression at the recovering step in mutually different decompression systems.

Method for production of aziridines and N-vinylamides

Crosslinked polymers excellent in ion exchange capacity and catalytic activity and in resistance to thermal decomposition and widely applicable in various fields of use; a crosslinking agent which is suited for use as a raw material in the production of crosslinked polymers; a method of producing crosslinked polymers; a method of producing a spherical particle which is suited for use in the production of crosslinked polymers; a method of producing a hydroxy alkyl (meth)acrylate; and a method of producing glycols using the crosslinked polymers are provided. The crosslinked polymer has at least one crosslink structure and a tertiary amine structure and/or a quaternary ammonium salt structure, wherein at least one crosslink structure is represented by the following general formula (1):

Crosslinked polymers containing tertiary amine and/or quaternary ammonium salt structures, processes for making and uses thereof

In order to carry out various vapor-phase reactions (e.g., the preparation of aziridine compounds by a vapor-phase intramolecular dehydration reaction) with industrial advantages, there is provided a process which can effectively prevent the adhesion of tarry matter to piping and the like. This process is applicable, for example, to the preparation of aziridine compounds by using a reactor for carrying out the vapor-phase intramolecular dehydration reaction of an alkanolamine, a collection column for collecting an aziridine compound present in the reaction gas, and a distillation column for distilling the collector liquid to obtain a purified aziridine compound, and is characterized in that at least the piping section extending from the outlet of the reactor to the inlet of the collection column is maintained at a temperature which is not lower than 200&deg; C., or in that the reaction gas is brought into contact with a collector prior to its introduction into the collection column.

Processes for the preparation of aziridine compounds and vapor-phase reaction processes

There is provided a method of efficiently removing polymer stuck to the inside and/or on the surface of packings of a distillation tower, when nitrogen-containing polymerizable monomers (for example, ethyleneimine) are distilled. Said method consists of washing the inside and/or packings of a distillation tower with an acidic liquid (for example, aqueous solution of acetic acid).

Washing method for distillation system of nitrogen-containing polymerizable monomers

In manufacturing ethylene oxide by catalytic vapor phase oxidation of ethylene, a process comprising adding, as liquid, an organic halide as a reaction inhibitor into the ethylene raw material gas flow is provided. According to this process, ethylene oxide can be manufactured stably and in high selectivity.

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Yokohama, Japan

Kenichi Takematsu