RU37094U1 - INSTALLATION OF ISOPRENE DISTRIBUTION - Google Patents

Description

INSTALLING ISONRENE DISTRIBUTION

The utility model relates to the field of petrochemistry, and more specifically, to the isolation of isoprene obtained by the two-stage dehydrogenation of isopentane and used as a monomer in the production of butyl rubber.

A known installation for the isolation of isoprene from the isoamylene isoprene fraction obtained by the method of two-stage dehydrogenation of isopentane (TV Bashkatov, Ya.L. Zhigalin "Technology of synthetic rubbers, M.," Chemistry, 1980, p. 89-90). The installation contains a two-stage extractive distillation unit for purification from cyclopentadiene and acetylene compounds, and a rectification unit for the obtained crude isoprene.

The described installation does not allow sufficient purification of isoprene from undesirable impurities, such as cyclopentadiene and acetylene compounds, which adversely affect the polymerization process.

Closest to the proposed one is an isoprene separation unit, including a crude isoprene rectification unit from piperylene and cyclopentadiene (CPD), consisting of three columns, two of which work in one unit, a chemical purification unit of isoprene from CPD, consisting of a diaphragm mixer, three reactors and a distillation column, an isoprene washing unit from carbonyl and amino compounds, consisting of a washing column and a settling tank, and an acetylene hydrocarbon hydrogenation unit, consisting of three sequentially operating Ktorov, separator and brine condenser (PA Kirpichnikov BERESNEV V., Popov LM "Album technological

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IPC C 07 C 11/18

schemes of the main production of synthetic rubber industry, L., “Chemistry, 1986, pp. 66-68).

Purification of isoprene from acetylene compounds in the described installation is carried out in the hydrogenation unit, which leads to an increase in the content of isoamylenes in the target product, which negatively affects the process of producing butyl rubber.

The objective of the utility model is to create an installation for the isolation of isoprene with a reduced content of isoamylenes that meets the requirements for the production of butyl rubber.

The problem is solved by the installation of isoprene separation, which includes distillation units from piperylene and cyclopentadiene, chemical purification from cyclopentadiene, washing from carbonyl and amino compounds, consisting of a column and a sump for separating water from isoprene, and a rectification column of isoprene separation located after the washing unit the washing unit from carbonyl and amino compounds further comprises a mixing device and a sump installed after the sump to separate water from isoprene.

The mixing device can be made in the form of a tank with a mechanical stirrer of any design, for example, a multi-blade, frame, propeller, etc., providing turbulent flow movement, and a lounger for sedimentation of the aqueous phase and isoprene.

The difference between the proposed installation and the closest one is that it additionally contains a distillation column for isolating isoprene, which is located after the washing unit from carbonyl and amino compounds, and the washing unit is equipped with a mixing device and a sump designed to separate water from isoprene.

The installation for the isolation of isoprene (Fig.) Includes:

- a crude isoprene rectification unit from piperylene and cyclopentadiene (CPD), which consists of two distillation columns li and b working as one column, tanks 11 and 12 and distillation column 2;

-the site of chemical purification of isoprene from the CPD, consisting of a diaphragm mixer 3, three reactors 4i, 42, 4z, distillation column 5 and tank 13;

-the site for washing isoprene from carbonyl and amino compounds, consisting of a washing column 6, a settling tank 7, a mixing device 8 and a settling tank 9;

rectification column 10; -capacitor And;

capacity 12.

The proposed installation works as follows.

Raw isoprene enters the rectification columns li and b, working as a single column.

Vapors from the top of column li, heated with hot water at a temperature of 90-95 ° C using an external boiler, enter the cube of column 12, bottoms of column b are fed to the top of column Ib Vapors of isoprene are taken from the top of column b and sent through a reflux condenser and condenser ( not shown in the diagram) into the tank 11, from where part of the isoprene is returned to the column in the form of reflux, the rest is fed to the chemical treatment unit.

The isoprene-piperylene fraction from the cube of column li is fed to column 2 for rectification from piperylene. Column 2 is heated with hot water through a remote boiler. Isoprene vapors from the top of column 2 through a condenser (not shown in the diagram) are collected in a tank

12, from where part of it is supplied in the form of reflux for column irrigation, and the rest is returned to the column li. The bottoms liquid of column 2 — the piperylene fraction — is pumped to the warehouse.

Raw isoprene, taken from the top of the b column, is fed into the diaphragm mixer 3, where it is mixed with the bottoms liquid of the column 5, and through the heater (not shown in the diagram) is sent to the lower part of the reactor 4i loaded with solid caustic potassium. From the top of reactor 4i, the reaction mixture is fed to the bottom of reactor 42 and from the top of reactor 42 to the bottom of reactor 4h. In these reactors, in the presence of alkali, the CPD interacts with cyclohexanone, resulting in the formation of fulvene, which is easily separated from isoprene by distillation. The reaction mixture from the top of the reactor 4h is fed into a distillation column 5, which is equipped with a boiler heated by hot water.

Isoprene, purified from the central heating system, through a refrigerator (not shown in the diagram) and a tank 13 is sent to the column 6 equipped with a bed for separating condensate from isoprene to be washed with water condensate from carbonyl and amino compounds. Washed isoprene in the sump 7 is separated from the water. The top layer isoprene through a refrigerator (not shown in the diagram) is fed into a mixing device 8, where it is washed with steam condensate at a temperature of 25 ° C and a water: isoprene ratio of 1: 1. The mixing device is equipped with a mechanical stirrer and a bed for condensate settling.

Washed isoprene from the mixing device 8 enters the sump 9, where it is separated from the water. The top layer isoprene enters the distillation column 10. Heating of the column cube is carried out through an external boiler with hot water. Isoprene vapor from top to

Claims (1)

Installation for isolating isoprene, including distillation units from piperylene and cyclopentadiene, chemical purification from cyclopentadiene, washing from carbonyl and amino compounds, consisting of a column and a sump for separating water from isoprene, characterized in that it contains a distillation column for isolating isoprene located after the washing unit, wherein the washing unit from carbonyl and amino compounds further comprises a mixing device and a sump installed after the sump to separate water from isoprene.