SU735294A1 - Apparatus for extracting polymeres from solutions - Google Patents

Description

. .1 The invention is intended for separating polymers from solutions (degassing) and can be used as a degasser in the synthetic rubber industry. Apparatuses for separating synthetic rubbers from solutions are known, consisting of a housing sectioned at height, fittings for the entry and exit of products, overflow devices and equipped with mixing devices and baffles 1. In such devices, the process of water degassing of rubbers occurs as a result of contacting the polymer solution with hot water and water vapor. Also known is an apparatus, inclusive housing with fittings, partitioned by plates in height, on which the steam hoods are installed, equipment and overflow pipes that serve as reflective partitions 12. During the water degassing of synthetic rubbers in the first stage, the vapor-liquid mixture from the crumb directly into the water layer - Forms rubber crumb suspension in water. To prevent the formation of lumps and clogging of the apparatus, it is necessary to mix the rubber crumb suspension intensively. Due to the high vapor saturation of the liquid in the upper section, as well as due to the effect on the volume of a powerful jet from the crumbing agent, mechanical agitators do not provide effective mixing, and the use of several injection mixing devices is not enough for; creating directed circulation loops, therefore, stagnant zones are formed. In addition, the large volume of vapors released in the first stage due to insufficient uniform distribution in the liquid phase causes a large amount of fine crumb to the condensation system. The supersaturation of the liquid by the vapor phase leads to a cavitational mode of operation of the mixing device, which contributes to its rapid destruction. The aim of the invention is to increase the efficiency of the process by improving the mixing conditions in the first stage.

This is achieved by the fact that an apparatus for separating polymers, containing a vertical cylindrical body with nozzles for introducing a vapor-liquid mixture with a polymer and evacuating vapor and product, a shaft with a mixing device, is provided with a suspension chamber, made in the form of a bent pipeline with circulation holes on the inner side, at the entrance to which is installed the supply pipe of the vapor-liquid mixture with the polymer; at the same time the product outlet from the chamber is directed to the periphery of the device. In addition, the suspension chamber may have an annular shape, and the outlet connection may be slit-like.

FIG. 1 shows the proposed apparatus, a general view; in fig. 2 shows section A-A in FIG. one; in fig. Figure 3 shows the suspension chamber, second embodiment.

The device has a body 1, unions 2, 3, 4, 5 and 6, a partition 7, mixed. 8, mounted on a shaft 9, an overflow pipe 10, a suspension chamber 11 with a nozzle .12 connected to a crumb former, and with a nozzle 13 of product withdrawal directed away from the agitator. The pipe 13 can be made slit-like. Holes are made in the suspension chamber. 14.

The device works as follows.

A vapor-liquid mixture consisting of water vapor, solvent vapor and a highly viscous polymer solution is supplied from the crushing agent through fitting 3 via nozzle 12 to suspension chamber 11. Circulating water is fed into the apparatus, through fitting 6. In the suspension chamber 11, a jet supplied with high speed through the opening 14 interacts with the water and the process of intensive grinding of polymer particles takes place and a thin suspension of the polymer is formed. Then, the polymer suspension and mixture of vapors are ejected into the agitated-water layer through the pipe 13 away from the agitator, rotating together with the shaft 9.

The mixture of vapors rises along the walls of the apparatus and, not interfering with the operation of the agitators, leaves the apparatus

fitting 2. At the same time, the direction of vapor movement coincides with the flow of liquid in the stirred volume, which contributes to the intensification of the mixing process.

After the first degassing stage, located on the first section, the polymer slurry is fed to the next treatment via the overflow pipe 10 to the nipple 5. At the next slurry stages, it can be subjected to steam treatment, which is supplied through the nipple 4.Supply the device with a suspension chamber It is impossible to direct a large part of the vapor on the side of the mixer to practically eliminate the influence of the vapor phase on the intensity of mixing, to evenly distribute a larger number of vapors in the volume of the apparatus, to improve the conditions production, thereby improving the efficiency of the process of distillation and solvent,

Claims (2)

1. A device for separating a polymer from solutions, including a vertical cylindrical body, with connections for introducing a vapor-liquid mixture with a polymer and for evaporating the vapor and product, a shaft with mixing devices, characterized in that it is aimed at increasing the efficiency of the process by improving mixing conditions; No, the apparatus is equipped with a suspension chamber, made in the form of a curved pipeline with circulation holes on the inner side, at the entrance to which the nozzle supplying the vapor-liquid mixture with the polymer is installed, with This product outlet pipe from the camera is directed to, the periphery of the apparatus. 2, the Apparatus according to claim 1, characterized in that the suspension chamber is annular in shape, and the product outlet nozzle is slit-shaped. Sources of information taken into account in the examination 1. Reichfeld at. Oh, Reaction apparatus and machines of the plants of basic organic synthesis and synthetic rubber, 1975. 2. US patent number 3933574,. cl. 159/16, 1976.