SU683604A3 - Apparatus for continuous preparation of synthetic resins for the manufacture of varnishes - Google Patents

Description

and exhaust gases. A branch pipe 7 for discharging the finished product is mounted in the lower section, as well as additional guide elements that form a hydraulic valve 8.

The device is provided with an axially mounted housing / shaft 9 with mixing blades 10 located between annular guide elements and central pipes. A leading gear gear // is provided for rotation of shaft 9. In one of the intermediate sections there is provision for a socket 12 for a WB (Ode of gas. The second top section is equipped with a carboxylic acid feed nozzle 13.

Spray disks 14 are mounted on the shaft 9 above the reamer blades 10. Each section is provided with an autonomous heating element 15 (for example, induction), a measuring probe 16 containing temperature control means, and means 17 for sampling, unloading, washing and copolymerization.

The device is provided with a nozzle 18 installed in the lower section to ensure periodical full discharge.

The body of the device is made of steel plates clad with acid-resistant steel. Sections of the device are mounted together with the help of flanges. The sealing surfaces of the flanges are made of acid-resistant steel. Bearings for shaft 9 are installed outside the housing /.

The device is equipped with interconnected condenser 19, separator 20 and liquid shutter 21 connected through pipe 22 to pipe 6 for exhaust of gases and through pipe 22 from pipe 12 to the gas device.

A branch pipe 24 is provided for draining the gases from the condenser 19 through the liquid valve 21. A branch pipe 25 is provided for draining water from the separator 20.

The number of sections is determined by the reaction time of the resin production.

The device works as follows.

The homogenized initial components are pumped with an adjustable rotational speed to the upper section of the device through the pipe 5, pass between the casing and the annular guide element 3, flow through the central tube as a film to the next section, etc. In each section using an autonomous the heating element and the rotating mixing blades 10 are maintained at a certain temperature. The film thickness can be affected by changes in temperature, product viscosity and flow Reypolds number.

An increase in the feed rate of the initial components leads to an increase in the film thickness of the liquid, which leads to a decrease in the heat transfer coefficient. However, when gas is supplied through the nozzle 12 in a countercurrent to the flow of liquid, it bubbles through the liquid film, which increases its specific surface due to the formation of a bubbly phase, and, consequently, the heat transfer coefficient increases.

The process is carried out in such a way that the thicknesses of the films formed are in the range from 0.5 to 1.5 cm instead of the interval from 0.1 to 1.5 mm in film-type reaction apparatus.

The presence of annular guiding partitions and the multisection apparatus provides an increase in the length of the particle path and the duration of its stay in the reaction zone.

The finished product is unloaded continuously through the nozzle 7, through the hydraulic shutter 8, which prevents the ingress of oxygen into the device, eliminating the possibility of loss of solvent, preventing pressure fluctuations in the device, preventing the release of vapor into the atmosphere.

in an inert gas and providing the ability to maintain a pressure in the device close to the atsospheric one.

Heating elements can be made induction, which provides a small temperature difference between the body and the reaction mass, eliminates unwanted annealing of the device, increases the accuracy of temperature control and thermal stability. The temperature can be regulated in each section separately.

The number of revolutions of the shaft of the mixing blades is chosen in the range from 20 to 500 rpm.

The number of sections is selected taking into account the required residence time of the particles in the reaction volume. Most often use the device from 6 sections. Average duration of stay is 3-6 hours.

The flow rate is between 200 and 300 kg / g.

The gases formed during the reaction are discharged through pipe 6 to a condenser 19 cooled by water. In the separator 20

the phases of the condenser are separated, water is discharged through the nozzle 25, and the solvent is continuously supplied to the recycling unit through the nozzle 23. The solvent is compensated for by the loss of the solvent. Exhaust gases are discharged from the device through the liquid valve through the nozzle 24.

Example 1. In accordance with the selection, the upper section is an area

heating and polypriunitny. The following

the section may be a polyaddition or polycondensation zone, while the third section is a polycondensation zone. The adjustment of parameters in the fourth and fifth sections can be carried out as in the polymerization reaction zones.

The n + 1 zone, in this case the pole section, serves to complete the process and, therefore, cool the reaction medium in accordance with specific requirements.

The functional separation of the reaction zones indicated is arbitrary,

moreover, the value of the process parameters in these zones can be adjusted.

The adjustment carried out in this manner is generally acceptable for the production of most airborne alkyd resins.

For the selected air-drying ricinen or ricinen with another oil of modified alkyd type with a high degree of polymerization (55-70%), the parameters presented in Table 2 can be adjusted. 1. The flow rate of the feedstock 200-250 kg / h; process time 18 hours

Table 1

Note. For the final product obtained in peridic action.

Example 2. To obtain a curing, non-dehydrated ripine, as well as another oil of a modified alkyd type with a low degree of polymerization and a certain length of stretchable threads (30-45%) can be carried out. For the final product obtained with no batch operation.

In tab. 3 shows the specific productivity of the reaction apparatus.

regulation parameters presented in Table. 2

The flow rate of the inert gas and xylene, respectively, is 15-30 and 10-100 kg / h, the duration of the process is 22 hours. The flow rate of the feedstock is 180- 250 kg / h.

table 2

continuous action and autoclave of periodic action. During the course of the process, using equipment based on these resins, products (paints and enamels) of better quality are obtained than on the basis of resins obtained on other known devices.

When switching from one product to another, it is possible to clean the surface of the device with a detergent without dismantling the equipment.

Claims (4)

1. A device for continuous production of synthetic resins for the production of varnishes, containing a vertically mounted cylindrical body divided by horizontal partitions into sections equipped with annular guide elements and central pipes for the flow of liquid and gas from section to section, with the supply pipes for the initial components mounted in the upper section and removal of gases, and in the bottom - pipes of removal of the finished product, characterized in that, in order to increase the productivity of the process, the device is provided wife fixed on eight Table 3 The axle axle of the housing to the shaft with the mixing blades located between the annular guide elements and the spray discs placed above them, and in the lower part of the housing an inert gas and solvent vapors supply pipe is mounted, and in the lower section there are additional guide elements that form a hydraulic lock. 2. A device according to claim 1, characterized in that each section is provided with an autonomous heating element. 3. A device according to claim 1, characterized in that the second section from the top is provided with a carboxylic acid supply nozzle. 4. The device according to claim 1, characterized in that it is provided with a condenser and a phase separator connected to each other, connected to the nozzles for discharging gases and supplying inert gas and solvent vapors. The source of information taken into account in the examination: 1. USSR author's certificate No. 288223, cl. B 01J 1/00, 1965. 75 12