SU1726494A1 - Method of producing unsaturated hydrocarbons - Google Patents

Description

chopping 6 input and 7 output heating environment. The pyrolysis chamber is equipped with a heat carrier inlet 8, a fuel inlet 9, a pyrolysis product outlet 10, a pyrolysis product outlet 11, liquid and coking parts of a hydrocarbon feedstock.

The lower part of the U-shaped partition and the bottom of the apparatus case are equipped with the pipes 12 and 13, respectively, of the heat-transfer fluid.

The proposed method is implemented as follows. Depending on the properties of the pyrolyzable hydrocarbon feedstock, molten metals, slags, sitalls, salts, or specially prepared compounds that are thermally stable and do not react with the pyrolyzable feedstock and its decomposition products can be used as heat-transfer fluid.

As a heating medium, heated gases or combustion products, which also do not enter into chemical interaction with a heat-transfer fluid, can be used.

As a hydrocarbon feedstock can be used, for example, fuel oil composition, wt.%:

С83,9

H11,8

N0.57

S3,5

A heated liquid coolant, for example, tin, is poured into the housing of the apparatus through the pipe 8 to the upper edge of the U-shaped partition 3. The heating medium is bubbled through the pipe 6 at a speed of 50-70 m / s under a layer of liquid heat carrier. The heat-transfer fluid is heated by contact to 950-1100 ° C and by an air-lift method it is flowed up and flowing through the channel between the walls of the nepefood 2 and 3 into the reaction chamber 5.

The heating medium is discharged from the heating zone through nozzle 7. Pyrolyzed hydrocarbon feedstock is supplied to the reaction chamber 5 at a speed of 100 m / s in the form of a sharp jet under a layer of heated molten heat carrier. A strong flow of hydrocarbon feedstock and its decomposition products creates an upward flow of the annular channel with heat exchange with the molten coolant surrounding the annular channel of the reaction zone. The exposure time of the pyrolysis products in the reaction zone is 0.1 s. The flow of decomposition products also causes upward movement of the incoming heat carrier and its transfusion through

the upper edge of the U-shaped wall and the movement along the gap between the wall 3 and the wall of the housing in the heating zone A.

The reaction temperature of the fuel oil is maintained at 900 ° C. As a result of pyrolysis by the proposed method, wt.% Are obtained: Tazy65.3

Light oils8.2

T yellow oils 12,1

Coke14,4

Gas composition, vol.%:

Hydrogen27.0

Carbon monoxide3.9

Carbon dioxide5,1

Ethylene18,7

Propylene 11,3

Ethan17,2

Propane.16,7

The pyrolysis products are withdrawn to the condensation system through the pipe 10. Liquid products collected in the reaction zone on the surface of the liquid heat carrier and the coke are withdrawn through the pipe 11. When the apparatus is stopped, the liquid heat carrier is discharged through the pipes 12 and 13.

The airlift rise of the molten coolant, achieved in the reaction zone and the heating zone, creates an intensive directional circulation of the coolant between the heating and reaction zones, intensifying the heat exchange. In particular, the heat transfer area of the gaseous coolant in this method is 196349.53 cm2, against 4390.51 cm2 of the known. The heat consumption of this method is 2195.25 J / s, and in the known method it is 98174.77 J / s.

Thus, the bubbling mode of heat transfer from the heating medium to the molten coolant allows reducing the heat consumption in comparison with the known technical solution.

Claims (1)

Formula of the Invention A method of obtaining unsaturated hydrocarbons by supplying hydrocarbon feedstock to the pyrolysis zone in the form of a sharp jet through the coolant melted in the heating zone with the subsequent removal of the resulting products from the pyrolysis zone, so that, in order to intensify heat exchange and reduce heat consumption, the molten coolant is fed to the pyrolysis zone by airlift by bubbling heating medium and the molten coolant is supplied to the heating zone by an airlift created by contact with sharp stream of pyrolysis raw materials.