SU1053870A1 - Apparatus for suspension polymerization - Google Patents

Abstract

1, THE DEVICE FOR SUSPENSION POLYMERIZATION, containing a corus with technological unions and a heat exchange jacket, mix-; A vacuum device with a driving shaft and a scraper device, freely mounted on the drive shaft, that is, and is. The fact that, in order to increase the reliability of work and improve the quality of the target product by automatically periodically cleaning the walls and the casing from sticking particles of the polymer, the scraper device is mounted on the drive shaft by means of bushings. inside which are placed inserts, made of a material having a higher coefficient of volumetric dissipation than the material of the sleeves, 2. The apparatus according to claim 1, except that the scraper device is provided with partitions. SP 00 00

Description

The invention relates to apparatus for the suspension polymerization of synthetic rubbers and can be used in various processes of chemical technology for treating suspensions prone to sticking 5 onto heat transfer surfaces.

Known polymerization, comprising a housing and a mixing device, made in the form of a frame or scraper and blade agitators, 10 mounted on a single shaft Cl

The disadvantages of this apparatus are a small number of revolutions of the mixing device, which is due to the presence of a frame or 5 scraper mixer; the formation of a funnel, which can lead to the reaction mixture getting into the vapor suction nozzle of the solid phase at the bottom of the apparatus in the case. pension polymerization due to insufficient turbulization of the reaction mass.

The closest to the invention in its technical essence and the result achieved is a suspension polymerization apparatus, comprising a housing with process fittings and a heat exchange jacket / mixing device with an actuator, and a scraper unit freely mounted on the drive shaft C2D. .

A disadvantage of the known apparatus is the ability of the polymer to stick to the inner surface 35 of the housing and to form local stagnant zones, which leads to a decrease in the quality of the target product.

The purpose of the invention is to increase the reliability and increase the quality of the target product due to the automatic periodic cleaning of the walls of the housing from adhering polymer particles.

This goal is achieved by the fact that, in an apparatus for suspension coating, comprising a housing with process fittings and a heat exchange jacket, a mixing device with a driven shaft and a scraper sprue device freely mounted on the drive shaft, the scraper device is mounted on the drive shaft by means of sleeves inside posted contributions made from. a material having a higher coefficient of volume expansion than the material of the sleeves.

Moreover, the scraper device is equipped with partitions.

FIG. 1 shows the basic diagram of the apparatus; in fig. 2 - the same, horizontal section; in fig. 3 execution sleeve.

The apparatus includes a housing 1 with a heat exchange jacket, inside which 65

there is a mixing device in the form of a mesh; ki 2 mounted on shaft 3, partitions 4 secured by sleeves 5 on shaft 3, scrapers 6 are mounted using hinges 7 on the edges of partitions 4 external to the device radius, process nipples 8 and 9 for supplying and removing the reaction mass and for entry and exit coolant, respectively. The sleeve 5 includes a housing 10 within which an insert 11 is placed, directly enclosing the shaft 3. The radial spokes 12 are also rigidly fixed to the housing body 10, which are also attached to the partitions 4.

The apparatus can operate both in continuous and in batch mode. The initial components are fed through fitting 8. As a result of the synthesis process, a polymer is formed that is insoluble in the monomer. The heat of reaction is removed through a heat exchange jacket. A turbine or blade mixer, rotating with a large number of revolutions, provides the necessary turbulization of the reaction mass. Sleeve 5 relative to the shaft 3 is installed freely, i.e. they are essentially the sliding bearings to which the baffles are attached. The presence of partitions 4 ensures the weighing of the solid phase and eliminates the appearance of a central funnel in the event of an incomplete filling of the apparatus. Under the action of the hydrodynamic pressure developed by the agitator 2, the partitions also rotate relative to the housing 1. But since the scrapers b are attached to them, as a result of their rubbing against the housing, I suck the interstitial walls. with a small number of revolutions.

To increase the effect of hydrodynamic forces on the partitions, the surface of the partitions, on which the indicated forces act, can be performed at an angle to the radius of the apparatus. Moreover, this angle depends on the ratio of the radix and tangential velocities in the horizontal section of the apparatus.

In order to ensure rotation of the partitions that follow the body, the inserts 11 of the sleeves 5 should be made of a material (for example, caprolon), having a coefficient of volume expansion and a larger one than what the material is. loK (steel) 5. In this case, when the shaft 3 rotates in the bushings 11 of the bushings / which appear to be sliding bearings, the bushings of the bushings 11 are heated and as a result of their expansion, the slip pair is jammed. Partitions receive a torque from the shaft of the mixing device. When the relative speed of rotation of the shaft 3 and the sleeves 5 decreases, the heating decreases and the shaft

rotates freely again

sleeve,, Thus, this unit

Compared with the known, it allows to slurry susceptible to pouring (Pania on heat transfer surfaces.

In addition, there are no stagnant zones in the apparatus, since the partitions are also yrashagots.

The economic effect of the introduction of a single unit will amount to 31 thousand rubles.

Claims (2)

1. APPARATUS FOR SUSPENSION POLYMERIZATIONS, comprising a housing with technological fittings and a heat-exchange jacket, mixing **: a mixing device with a drive shaft and a scraper device that is freely mounted on the drive shaft, and so on. that, in order to improve the reliability of the work and improve the quality of the target product due to automatic periodic cleaning of the walls, the housing of polymer sticking particles, the scraper · device is mounted on the drive shaft by means of bushings. inside of which are liners, made of a material having a higher coefficient of volume expansion than the material of the bushings. 2. The apparatus by π. 1, characterized in that the scraper device is provided with partitions. Joint venture 00 oo m> 10.5387 0