Basf Se Corporation

Kolon Plastics, Inc.

Samsung Medison Co., Ltd.

JongMoon Kim

Thomas Heitz

Marvin Kramp

Achim Stammer

Manfred Heilig

Jin-Sang Choi

In Gi Cho

In-Gi Cho

HyunSoo Chang

Sangmok Lee

Sang-Yup Lee

Minlu Zhang

A process for making an oxymethylene polymer comprising polymerizing at least one compound capable of forming &#x2014;CHO&#x2014; repeat units (monomer) in the presence of at least one ester of the general formula I (ester): R&#x2014;CO&#x2014;O&#x2014;R(I) wherein Rcan be hydrogen, wherein Rand Rare independently of each other linear or branched Cto Calkyl Cto Ccycloalkyl &#x2014;[R-0-]Rwherein Ris a linear or branched Cto Calkylen and Ris a linear of branched Cto Calkyl and n is an integer of from 1 to 5. and in the presence of at least one Lewis acid.

Process for making an oxymethylene polymer

The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit () wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column () from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit. An aqueous fraction stream from the phase separation unit is transferred to a waste water column (), withdrawing a waste water stream from the bottom of the waste water column, withdrawing a side stream () from a stage between the feed stage and the reflux stage of the waste water column and recycling this stream () to the phase separation unit, and withdrawing a distillate stream () containing methanol from the waste water column.

Process for preparing dioxolane

The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit () wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column () from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit. An aqueous fraction stream from the phase separation unit is transferred to a waste water column (), withdrawing a waste water stream from the bottom of the waste water column, recycling a distillate stream () from the waste water column to the phase separation unit, and withdrawing a side stream () containing methanol from a stage below the feed stage of the waste water column.

The present invention relates to a process for energy recovery in a process for the preparation of 1,3,5-trioxane.

Energy recovery in a method for preparing 1,3,5-trioxane

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Gimcheon, South Korea

JongMoon Kim