DD207104A3 - POST-REACTOR FOR THE CONTINUOUS PREPARATION OF EPOXY RESINS - Google Patents

Abstract

The invention relates to a post-reactor for the continuous production of epoxy resins by completion of the condensation of an epoxy resin reaction mixture, which is formed from phenols or halogenated phenols, epichlorohydrin, alkali metal hydroxide and optionally additives. The condensation is completed in one or more post-reactors, the postreactor consisting of a circular stator (1) and a circular rotor with drive shaft (2) in pressure-resistant design, which face each other with interdigitated tooth elements (3) arranged thereon Shape of Zahnkraenzen (4) are formed, wherein the stator (1) is provided with toothed elements part of the stationary Gehaeuses and surrounds the rotor and the stator insertion elements (6, 7, 8) and a Abfuehrungselement (9) and the rotor ( 2) is designed such that it extends to the inner ring gear of the stator (1) according to its tooth height.

Description

ZÜ4ZZ0 J

VEB Leuna-Werke Leuna, 17. 9. 1981

»Walter Ulbricht η

LP 8183

Title of the invention

Sach reactor for the continuous production of epoxy resins

Field of application of the invention

This invention relates to a JSäcareaitor for iontinuierlionen synthesis of epoxy resins, which are formed by completing the condensation of an epoxy resin reaction mixture, which was formed from Spichlorhydrin, phenols or halogenated phenols, alkali metal hydroxide and optionally additives.

Characteristic of the known technical solutions

For the continuous production of epoxy resins in which epiehlorohydrin, 2,2-bis (4-hydroxyphenyl) propane and aqueous sodium hydroxide solution are brewed for the purpose of recovery, various devices are known. In the US-PS Z 840 541 a method is described in which the resin synthesis in several stages in a Bührkaskade

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is carried out. The reaction time is very long in this method, so that nor a low space-time yield is achieved. When using stirred cascades, a variety of organic by-products also occur which degrade epoxy resin quality. In order to avoid these Haohteile in US-PS 2,986,551 a Euhrwerkskaskade with 6 reactors and acetone as Lösungsvermittl described r. The residence time is 3 to 15 minutes per reactor. There is a gradual addition of sodium hydroxide.

In DD-PS 137 805 is a continuous process for the preparation of epoxy resins with 1 or 2 Sealctoren, a maximum Verweilaeit 5 or 10 see, a speed of 15 to 50 m.seo "and a temperature of 60 to 180 ⁰ O. Disadvantageous in this process is the high phenolic hydroxyl-containing monoglycidyl compounds of 6 to 10 percent by weight and saponification products of the diglycidyl ethers of 12 to 18 percent by mass in the epoxy resin. This composition of the epoxy resin degrades the utility properties and adversely affects the specific consumption of the epoxy resin Starting products.

Object of the invention

The aim of the invention is the development of a Epoxidharznachreaktors in druokfester execution, in the epoxy resin reaction mixtures with incomplete conversion zn epoxy resin reaction mixtures with complete Itasatz whose epoxy resin has an epoxide equivalent of 170 to 4000, continuously in high space-time yield and in constant quality can be produced.

Explanation of the essence of the invention

The invention is based on the object, a Uachreaktor for the continuous production of epoxy resins by

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To develop the condensation of a BPO resin reaction mixture while reducing investment costs, space requirements, and assembly and denial costs for maintenance.

This object is achieved in that aer iJachreaktor in pressure resistant design consists of a circular stator and a circular Eotor with drive shaft, the facing surfaces having arranged thereon intermeshing tooth elements, which are formed in the form of tto tooth rims, the stator with Toothed elements equipped part of the stationary housing and surrounds the rotor and the stator has insertion elements and a Abfiihrungselement and the rotor is designed such that it extends to the inner ring gear of the stator according to his ZahnelementenhiShe «rotor and stator contain each 2 to 8 sprockets, said the inner ring gear of the rotor between the located near the axis first and second ring gear of the stator is located. The tooth elements of the stator and the hotor are arranged offset in prismatic form and топ ring gear to ring gear.

On the surface facing away from the stator of the rotor 2 to Abstreifstege are mounted radially and axially on the cylindrical outer surface of the rotor Z to 8 Abstreifstege. An Abfuhrungselement is located on the stator and axially between the first and second inner ring gear of the stator open an introduction element for the Beaktionsgemisch and a KLnführungselement for the additive. The stator has a cooling device in Fora a cooling jacket including the Kunlmantelanschlüsse and an element for Kuhliaittelzuführung in the Beaktorraum *

embodiment

The invention will be explained in the following with reference to the drawings on a Aufährungs example with cylindrical tooth elements, in which Figure 1 is a plan view of the Eotor

ZÜ4ZZ0 1

and Sigur 2 shows a longitudinal section through the Epoxidharznachreaktor, wherein only the cut tooth elements are shown, and the ligur 3 show a rear view of the rotor.

The Epoxidharznachreaktor consists of a circular stator 1 and a circular rotor with drive shaft 2, the facing KLäcoea with offset thereon arranged toothed elements 3 have, which are in the form of sprockets 4, wherein stator 1 and rotor 2 each contain 4 sprockets. The inner ring gear 4 of the rotor Z is located between the located near the axis of the first and second ring gear of the stator 1. Here, the rotor Z is designed such that it extends to the inner ring gear of the stator according to its Zahnelementenhöhe. On the faces of the rotor 2 facing away from the stator 1, 4 radial stripping webs 5 are mounted radially on the cylindrical surface of the rotor Z and 4 are mounted on the cylindrical surface.

Between the first and second sprocket of the stator 1 located near the axis, an introduction element 6 for the reaction mixture, an introduction element 7 for the additive and an introduction element 8 for the coolant supply. Anaxially on the stator 1 a Abftthrungselement 9 is present. To the stator 1, a cooling jacket 10 with 4 coolant connections 11 is attached.

The EpoxLdharz reaction mixture flows under pressure continuously through the Einzugsseieisent 6 between the first and second inner ring gear of the stator 1 in the Hachreaktor, is carried by the rotational movement of the tooth elements 3 of the rotor Z , thrown by the Sliehkräfte outwardly, through the tooth elements 3 of Distracted stator 1, thereby intensively mixed and reacts with complete conversion to epoxy resin, at the same time by the BinfUhrungselement 7 continuously injected under pressure additive. The epoxy resin reaction mixture is removed with the Abstreifstegsn of them opposite Plächen the stator 1. The heat of reaction is on the one hand through the

Reactor leaving reaction product and on the other both by the cooling jacket 10 flowing through the coolant as well as by the coolant, which flows through the introduction element 8 for the coolant supply under pressure directly into the Saehrealctor, discharged.

With this epoxy post-reactor, the continuous production of epoxy resins with an epoxide equivalent of 170-4000 is possible at a high Vasa time-wastage and constant quality.

Claims (7)

и пи claim for invention (1) is located. 1. Hachreaktor for the continuous production of epoxy resins by completing the condensation of an epoxy resin Beaktionsgemisches, which was formed from epichlorohydrin, phenols or halogenated phenols, alkali metal hydroxide and optionally additives, characterized in that the Hach reactor in druckfester execution aua a circular stator (1) and a circular Hotor with drive shaft (2), the mutually facing ilächen arranged thereon with interlocking tooth elements (3), which are in the form of sprockets (4) possess, wherein the stator (1) equipped with toothed elements (3) part of the stationary housing and surrounds the Hotor (2) and the stator (1) SLnfünrungselemente (6,7, S) and a Abftihrungselement (9) and the rotor (2) is designed such that it extends to the inner ring gear of the stator (1) ranges according to his tooth height. (2) formed in a prismatic shape and the tooth elements (3) of the stator (1) and the Eotors (2) of sprocket (4) to sprocket (4) are arranged offset. Ш220 1 2 »Sachreaktor according to Punfct 1, characterized in that rotor (2) and stator (1) each have 2 to 8 sprockets (4), preferably 3 to 5 sprockets, wherein the inner sprocket (4) of the rotor (2) between the first and second toothed ring of the stator located near the axis 3 · - Sach reactor according to Panfct 1 and 2, characterized in that the tooth elements (3) of the stator (1) and the rotor 4. Hachrealctor according to item 1 to 3, characterized in that on the stator (1) facing away from the surface of the rotor (2) radially 2 to 8, preferably 3 to 6 Abstreifatege (5) and on the cylindrical outer surface of the Ho.tors ( 2) axial г to 3, preferably 3 to 6 Abstreifstege (5) are mounted. 5. Bach reactor according to item 1 to 4, characterized in that anaxially on the stator (1) is a Abfübrungselement (9). 6. laughter reactor according to item 1 to 5, characterized in that between the first and second inner ring gear of the stator (1) open a Binführungselsment (6) for epoxy reaction mixture and an introduction element (7) for the additive axially. 7. Uachreaktor according to item 1 to 6, characterized in that the stator (1) has a cooling device in the form of a cooling jacket (10) including the coolant connections (11) and an element for Kühlmittelzuführong (8) in the Ifachreaktor. This includes 2 leaves drawings