Method for coupling deethanization process and propane dehydrogenation process before hydrocarbon steam cracking

Abstract

The invention discloses a method for coupling a deethanization process and a propane dehydrogenation process before hydrocarbon steam cracking in the technical field of petrochemical engineering. Aiming at the characteristics of cracking gas of a hydrocarbon steam cracking device and reaction gas of a propane dehydrogenation device, through coupling of the two processes, the purposes of reducing equipment investment, reducing device energy consumption, reducing construction land and prolonging the service life of an alkyne hydrogenation catalyst are achieved, and long-period stable productionof a coupling device is facilitated.

Description

Technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a method for coupling a process of deethane and propane dehydrogenation before steam cracking of hydrocarbons. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry, and its output is a measure of the overall development level of a country's petrochemical industry. Ethylene production technologies include steam cracking of hydrocarbons, methanol to olefins, olefin conversion, etc., among which hydrocarbon steam cracking is dominant. At present, the world’s major hydrocarbon steam cracking technology patentees are: KBR of the United States, Linde of Germany, Lummus of the United States and Technip of France. These technologies all use cryogenic separation processes to obtain ethylene products. For different cracking raw materials, the separation process can be divided into sequential separation process, ...

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Problems solved by technology

The reaction gas has not been treated with alkali washing, because it contains a certain amount of carbon dioxide, if it is not removed by alkali washing, there is a risk of blocking the cold box

In addition, the destination of the hydrogen-containing tail gas is not clear for both methods, and the impact on the low temperature load and the life of the acetylene hydrogenation catalyst is unknown

[0007] Chinese patent CN110914225A discloses a process and equipment for the combination of propane dehydrogenation and steam cracking to produce propylene. This patent recycles propane back to the steam cracking process instead of propane dehydrogenation. Although the ethylene yield is increased, the methane content is also increased. , leading to an increase in subsequent separation energy consumption and a decrease in propylene yield

At the same time, the patent does not consider the adverse effects of a small amount of carbon dioxide in the reaction gas

[0008] None of the above patents have optimized the deoiling tower of the propane dehydrogenation unit, and the deoiling tower can share the depropanizer of the hydrocarbon steam cracking unit to remove heavy components to achieve further coupling

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