Method for separating catalytic splitting gas of enriching propylene and propane

Abstract

A separation process for the propene and propane enriched catalytic cracked gasincludes compressing to 10-14 atm, alkali washing, removing acidic gas, drying and C3 prefractionating in a fractional tower to obtain H2, methane, ethane, ethane and propene components from tower top and the propene, propane and C4 components from tower bottom.

Description

technical field [0001] The invention relates to a method for separating cracked gas, in particular to a method for separating catalytic cracked gas rich in carbon three components (including propylene and propane, etc.) in the petrochemical industry. Background technique [0002] In the petrochemical industry chain, the production of basic organic raw materials ethylene and propylene mainly uses pyrolysis gas and liquid phase raw materials in tubular cracking furnaces, such as ethane, propane and light hydrocarbons, as well as some atmospheric diesel or hydrogenated diesel, and The fractions obtained from the cleavage are separated. Separation usually adopts the method of compression cryogenic rectification, and there are also methods of oil absorption and pressure swing adsorption, but most of the industrial devices adopt the process of compression cryogenic distillation, and its process characteristics are: the cracked gas at the outlet of the cracking...

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Problems solved by technology

[0009] Chinese patent application 00113109.5 introduces a "method for separating and recovering ethylene, ethane, propylene and hydrogen from mixed gas containing hydrocarbons". The invention adopts acid washing, adsorption and cryogenic separation to obtain ethylene, ethane, propylene, etc. Distillate also has the defect that the process is more complicated

[0010] Chinese patent application 01132960.2 introduces "an improved cryogenic separation method for light hydrocarbons", which is to separate the compressed and cooled light hydrocarbon raw material gas through a gas-liquid separation tank, and then the gas phase components enter the component distribution device, so that all Carbon three, most of carbon two and a small amount of methane are transferred to the liquid phase at the bottom of the component distribution device. This inventive method reduces the load on the cold box and the demethanizer, and reduces energy consumption, but because only the gas phase enters the component distribution device part, so that the separation process of the components cannot be completed at one time, and the removal of methane also needs two towers to complete, and the process is more complicated

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