SU1357030A1 - Method of performing rectification and absorption in multistage concurrent apparatus - Google Patents

Abstract

The invention can be used in the implementation of rectification or absorption in multi-stage high-speed apparatus and allows to increase productivity, increase efficiency, reduce the size of the apparatus. After contacting the liquid with steam (gas) in contact devices, the liquid from the lying stage is alternately poured into at least two buffer tanks and then from the buffer tanks is also alternately poured into the lower stage. In this case, a pressure equal to the vapor (gas) pressure at the overlying stage is created in the filled buffer tank, and a pressure equal to the vapor pressure (gas) at the lower stage is created in the empty buffer tank. 1 h, para. f-ly, 1 ill. with (O (L with SP (X) o

Description

The invention relates to conducting heat and mass transfer processes for a vapor (gas) - liquid system in multistage apparatus columns and can be used in the chemical, petrochemical, food and other industries.

The aim of the invention is to increase productivity, increase efficiency and reduce the size of the apparatus.

The drawing shows the installation for the implementation of the method, a general view.

The installation consists of a housing 1, which is divided by horizontal partitions 2 into sections 3 and 4, a cube 55 of a dephlegmator 6 and two buffer tanks 7 and 8. On the partitions 2 contact devices 9, made in the form of a contact tube 10, separation device 11, are installed fluid inlet 12 in which fluid holes 13 are made ,, For supplying fluid from the dephlegmator 6, section 3 has an externally heated pipe 14, and drain pipe 15 is used to drain the liquid from section 4 to the cube 5,

For the supply of liquid from section 3 to section 4, buffer tanks 7 and 8 are used. For supplying liquid from section 3 to container 7 and 8, overflow pipes 16 and 17 are installed, on which stop valves 18 and 19 are placed. To drain liquid from containers 7 and 8 Section 4 is also installed. drain pipes 20 and 215 on which shut-off valves 22 and 23 are installed. To create the same pressure in tanks 7 and 8 when supplying fluid from the overlying section 3, nozzles 24 and 25 are used with shut-off valves installed on them

valves 26 and 27, and when draining the liquid from the buffer tanks to create the same pressure, pipes 28 and 29 are used, on which valves 30 and 31 are placed

The installation works as follows.

The ethanol-water mixture vapors from the cube 5 rise upwards along the installation body 1 and enter contact devices 9,. placed on section 4. The vapors of the mixture, the passage through the node 12 to enter the liquid, is sucked through the holes 13 of the liquid placed on

five

0

horizontals and partition walls 2, and transport the liquid in the form of a thin liquid film along the inner surface of the contact tube 10, whereby mass exchange is intensively carried out. At the exit of the contact tube, the liquid film is separated by means of a separating device 11.

D from the steam and merges onto the partition, and the vapor mixture moves upwards, entering the contact devices 9 of the upstream section 3,

After the vapor interacts with the liquid in section 3, the fortified vapors of the ethanol – water mixture enter the reflux condenser 6, where they condense. The liquid formed in the reflux condenser through pipe 14 is drained into a horizontal partition 2 of section 3, part of which enters contact devices 9, the other part alternately merges into buffer tanks 7 and 8, and from there enters section 4.

5 Drain the liquid from section 3 in the vessel 7 and 8 as follows. When the liquid is drained into the container 7, the valves 22 and 30 are closed, which prevents steam from breaking out of the section

0 4, and the valves 18 and 26 open. In this case, the pressure in the tank 7 above the liquid becomes equal to the pressure in section 3 and the liquid from section 3 under the effect of its own pressure is drained from the B capacity through the pipeline (pipe) 16.

After filling the tank 7, the liquid is drained from it into section 4 and at the same time the tank 8 is filled. The tank 8 is filled in the same way as tank 7, namely, valves 23 and 31 are closed and valves 19 and 27 are opened.

The emptying of the liquid (drain) from the tank 7 and 8 is also carried out alternately following 1 image. When emptying the tank 7, the valves 18 and 26 are closed, the valves 22 and 30 are opened, which provides the same pressure in the tank 7 and section 4. As a result, the liquid under its own pressure through the pipeline 20 drains onto the partition 2 of section 4. The emptying of the tank 8 is similar : valves 19 and 27 are closed, and valves 23 and 31 open.

Therefore, the valves operate in such a way that when filling up with

five

0

five

Bone 7, tank 8 is emptied, and vice versa, which ensures continuous operation of the installation. ;-) Then, liquid from section 4, contacting ethanol-water in contact devices 9 with vapors of the mixture, flows through pipe 15 into a cube, i.e. rectification column operates with full reflux.

Installation parameters on which the method was implemented: internal case diameter 120mm;

internal diameter of a contact tube is 30 mm;

contact tube length 100 mm;

the length of the perforated separation device 50 mm;

diameter of overflow pipes 30 mm

contact tube length 100 mm;

separation length 50 mm;

. diameter of overflow pipes 30 mm

the distance between two horizontal partitions (inter-step distance) is 200 mm;

volume of buffer capacity 0.5 m.

During the process of rectification, the overflow of liquid from section 3 to section 4 is carried out through buffer tanks 7 and 8. The installation effectively operates at a vapor velocity of 7-50 m / s. The efficiency is 0.45-0.54.

The implementation of the proposed method allows to improve the separation of the liquid (to reduce the entrainment of liquid at the overlying stage) without increasing

interstage distance and reduced productivity and, accordingly, increase the efficiency of the process.

Thus, the implementation of the proposed method of rectification and absorption allows more than 3 times increase in productivity, reduce the height of the apparatus and its diameter, significantly increase the efficiency of the mass transfer process.

Claims (2)

1. A method of rectification and absorption in multi-stage flow-through apparatuses, including contact of vapor (gas) with a liquid at a stage when vapor (gas) moves from the bottom up and flowing liquid from an overlying stage to the lower stage (at its second stage, characterized in that increase productivity, increase efficiency and reduce the size of the apparatus; the liquid from the overlying stage is alternately poured into at least two buffer tanks and is alternately drained from the buffer tanks to the lower stage; emoy buffer tank, a pressure equal to the pressure of steam (gas) to nizhele- Jaap (s stage. 2. Method POP.1 is also distinguished by the fact that pressures in buffer tanks are created by alternately connecting tanks to the steps of the apparatus. Editor A. Shandor Compiled by S.Trifonov Tehred M. Dgschyk Proof-reader S. Cherni Order 5917/3 Circulation 657 Subscription. VNISh State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4