SU1766942A1 - Method of hydrocarbon raw materials processing - Google Patents

Abstract

The essence of the invention: the hydrocarbon feedstock is subjected to pyrolysis in a contact reactor in the presence of a heat-transfer fluid. The heat-transfer fluid is heated in radiant and convective furnace tubes. Pyrolysis products are separated from the molten coolant. Regeneration of the heat-transfer fluid is carried out by contact in the furnace heating space of the furnace by dispersing through a distribution device, followed by cleaning the heat-carrier from slag with heat recovery from the gaseous products of coke combustion to heat convection tubes. 1 il.

Description

The invention relates to methods for the pyrolysis of hydrocarbon feedstocks and can be used in the chemical and petrochemical industries.

The purpose of the invention is to reduce coke positions and economic costs.

The drawing shows the installation diagram that implements the proposed method.

The installation contains a heating furnace 1 with radiant 2 and convective 3 pipes, with a gas-liquid heat exchanger located between them, in the upper part of which is a switchgear 4 of a liquid heat carrier, in the lower part a collector 5 of heat carrier A heat separator 6 is connected to the collection from the slag and the pump 7 supply of coolant to the heating pipes. The output of the radiant tubes is connected to a contact-type reactor 8, made in the form of a vertical tube, in the lower part of which the means for introducing hydrocarbons 9 are located, in the upper part

quenching cooler 10 and separator 11 for the purification of pyrolysis products. The liquid heat carrier exits the separator 11 to the switchgear through pipe 12.

The method is implemented as follows.

In the heating furnace 1, the molten liquid coolant (for example, tin) is heated by three heating steps. Dispersing through the switchgear 4 of the contact heat exchanger, heating from convective 3 and radiant 2 pipes to a temperature of 1000 ° C. A pump 7 creates a pressure of 35 atm, which is carried out by a circulation loop: pump 7 - convective pipes 3 - radiant pipes 2 - reactor 8 - cooler 10 - separator 11 - distribution device 4 - collection 5 - separator 6 - pump 7.

Hydrocarbons (for example, butane) are fed to the reactor 8 under pressure b at. At low gas flow rates they increase

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load or water vapor is added to the raw material. In the quenching cooler, the temperature of the pyrolysis products is brought to 400 ° C and separated from the melt of the heat carrier in the separator 11. The pyrolysis products are removed and the melt of the heat carrier is dispersed into the furnace space through the switchgear 4. The coke is burned, the heat from the coke combustion is utilized to heat the heat carrier in convective tubes. At the same time, the dispersed coolant is heated in the combustion space, which is then collected in the collector 5. In the separator 6, the coolant is cleaned of slag and the coolant is pumped into the heating tubes of the furnace and the reactor by pump 7.

The conversion rate of the feedstock (e.g., butane) is 95%. The output of ethylene is 38%, propylene - 13%.

In the proposed method, the heating of the pure coolant in the radiant and convective heating zones completely prevents the deposition of coke in the heating pipes.

The reduction of operations for the removal of gaseous products for burning coke and the consumption of oxidation, as well as additional heat for heating the heat carrier from burning coke in the combustion space reduces economic costs

20% compared to the prototype technical solution.

The absence of thermal pressure on the metal wall of the reactor in the proposed method makes it possible to achieve a reduction in coke deposits on the internal walls of the reactor as compared with the prototype method.

Claims (1)

CLAIMS A method for processing a hydrocarbon feed in a liquid coolant, comprising: heating a heating medium in the radiant and convective tubes furnace, pyrolysis feedstock selection pyrolysis products from the molten heat transfer fluid, recovery of the heat medium combustion of suspended therein coke gaseous oxidizing agent in the overflow pipe and withdrawing gaseous products of combustion of coke, characterized the fact that, in order to reduce coking and economic costs, pyrolysis is carried out in the contact reactor and the regeneration of liquid heat The toilers are contacted by heating in the furnace space of the furnace, dispersing through a switchgear, followed by cleaning the heat carrier from slag to recover heat from the gaseous products of burning coke to heat convective pipes.