Installing a two-stage dehydrogenation of isopentane

 

(57) Abstract:

The invention relates to petrochemistry, in particular to the two-stage dehydrogenation of isopentane, and can be used to improve cooling unit in those industries in which there are processes of heat transfer. The invention solves the problem of energy saving by heat recovery in the manufacturing process, and improve the environment and increase the efficiency of the dehydrogenation process. The invention consists in the fact that the installation of the two-stage dehydrogenation of isopentane, including serially connected reactor, separator, boiler, scrubber and cooling unit, which according to the invention consists of a thermosiphon modules connected in parallel, each module consists of serially connected thermosyphons, equipped with a lens compensators, and between different groups of thermosyphons installed horizontal separators, at the end of each module has a vertical separator. 2 Il.

The invention relates to petrochemistry, in particular to the two-stage dehydrogenation of isopentane, and can be used to conduct the

Known installation dehydrogenation of isopentane in isoamylene, including the separator, through which the mixture of fresh and return isopentanol faction enters the evaporator. Evaporation occurs at a temperature of 80oC and a pressure of 0.58 MPa. From the separator pair of isopentane enter the superheater, then hardening the coil reactor, where the overheat due to the heat of the contact strip. Next couple of isopentane overheat in a tube furnace up to 500-550oC and fed into the reactor under fluidized catalyst bed through a distribution grid. The heat required for the reaction, is supplied with hot regenerated catalyst circulating in the reactor-regenerator. Contact the gas from the reactor after passing through a cyclone for recovery of the principal amount of catalyst dust is sent to the cooling in the vertical HRSG. From the recovery boiler contact the gas with a temperature of 300oC enters the disc scrubber, where it is cooled to 40oC. the Scrubber is divided into two parts: in the upper part of the pump is continuously fed with water temperature 35oC, water circulation in the lower part is the pump. At the bottom of the scrubber catalyst accumulates dust, therefore, is carried out by gas water. From the separator the contact gas is fed to the allocation of isopentane-isoamylene faction. The spent catalyst from the reactor by the air transport lines is fed to the regeneration in the regenerator. The regenerated catalyst enters the regenerative glass regenerator. In the upper part of the recovery Cup is served natural gas for the recovery of hexavalent chromium to trivalent; in the lower part of the nitrogen Stripping of the catalyst product recovery. The recovered catalyst is transported into the reactor. Gases regeneration, passing cyclones in the upper part of the regenerator, cooled exhaust-heat boiler to 300oC, purified from the catalyst dust in the electrostatic precipitators and released into the atmosphere. However, the large costs toplyvoenergetycheskykh resources, lack of utilization of low-grade heat, high pressure losses due to flow resistance does not allow to solve the problem of energy conservation, improve the environment and increase the efficiency of the dehydrogenation process.

The invention solves the problem of increasing the efficiency of the process of two-stage dehydrogenation of isopentane, energy saving and environmental improvements by reducing losses Mae, reduction of metal consumption, utilization of low-grade heat in the second stage.

This objective is achieved in that the installation of the two-stage dehydrogenation of isopentane, including serially connected reactor, separator, boiler, scrubber, cooling unit consists of a thermosiphon modules connected in parallel, each module consists of serially connected thermosyphons, equipped with a lens compensators between different groups of thermosyphons installed horizontal separators, and at the end of each module has a vertical separator.

The difference of this invention from the prototype is that the cooling unit consists of parallel connected thermosiphon modules, and each module consists of serially connected thermosyphons, equipped with a lens compensators between different groups of thermosyphons installed horizontal separators, and at the end of each module installed vertical separator that provides a solution to the problem.

In Fig. 1 shows technologiesa installation diagram of the two-stage dehydrogenation of isopentane; Fig. 2, the cooling module.

scrubber 4, thermosiphon modules 5, between the individual groups which have horizontal separators 6 and at the end of each module installed vertical separator 7, the lens compensator 8.

Installing a two-stage dehydrogenation of isopentane works as follows. After the process is an equilibrium reaction in the presence of alimohammadi catalyst in the dehydrogenation of isopentane in the reactor 1 is formed a mixture of isomeric isoamylenes. The reaction temperature is not higher than 575oC. Contact the gas passage of the separator 2 for recovery of the principal amount of catalyst dust is supplied to the cooling tube space of the boiler 3, boiler 3 contact the gas with a temperature of 250oC enters the scrubber 4 where it is cooled and cleaned of catalyst dust, which accumulates in the lower part of the scrubber 4, the top of the scrubber 4 pin gas is transferred to the cooling unit, consisting of parallel connected thermosiphon modules 5, and then in the separators 6, 7 and further to the second stage dehydrogenation.

The use of this invention it is possible to install two-stage dehydrogenation of isopentane, the cooling unit which consists of the parallel connection is plennikami, used under the current scheme, the dehydrogenation process will go into more favorable conditions by reducing the pressure in the reactor, there will be a reduction of sediment, reduction of pressure loss in the process stream is the utilization of low-grade heat in the second stage, thereby solved delivered to the invention the problem of increasing the efficiency of the dehydrogenation process, energy saving, causing interest among producers to implement the project.

Installing a two-stage dehydrogenation of isopentane, including serially connected reactor, separator, boiler, scrubber and cooling unit consisting of a heat exchanger, wherein the cooling unit consists of a thermosiphon modules connected in parallel, each module consists of serially connected thermosyphons, equipped with a lens compensators, and in the middle of each module has a horizontal separator, and at the end of each module of the vertical separator.

 

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