Method for increasing production of propylene and ethylene

Abstract

The invention relates to a method for increasing the output of propylene and ethylene in a steam cracking process. The steam cracking process consists of a cracking furnace and a separation system. On this basis, a catalytic cracking system that uses the C4 fraction produced in the oil refining process as a raw material is added. Through this catalytic cracking system, the mixture of C4 olefins and alkanes is partially converted into propylene-rich And the cracked gas of ethylene, and the separation and purification of the target product is mainly completed by the separation system in the steam cracking process. The feature of the present invention is to fully tap the potential of the separation (recovery) system in steam cracking, only increase the catalytic cracking system composed of catalytic cracking reactor, oxidation cracking reactor and simple separation equipment, and increase low-carbon components such as propylene and ethylene. The output of olefins is conducive to the improvement of the economic benefits of enterprises.

Description

technical field [0001] The invention relates to a method for increasing the production of propylene and ethylene, more specifically, the invention relates to a method for increasing the production of propylene and ethylene by using the existing steam cracking ethylene production device and separation device. Background technique [0002] At present, the main production method of low-carbon olefins such as ethylene and propylene in the world is steam cracking / thermal cracking. The steam cracking process consists of two parts: a cracking furnace and a separation (recovery) system. In the steam cracking process, the mixture of cracking raw materials and steam is heated to a high temperature in the cracking furnace for thermal cracking reaction to generate cracked gas rich in ethylene and propylene, and then the cracked gas is sent to the separation (recovery) system for Separation and purification to obtain cracking products such as ethylene and propylene. [0003] In recent y...

AI Technical Summary

Problems solved by technology

Because the boiling point of each fraction in the C4 fraction of the refinery is very similar, the relative volatility of some fractions is very small, and it is difficult to effectively separate it by simple distillation; The energy consumption of separation is extremely considerable, and it is difficult for these two separation methods to guarantee the purity of the separated fraction, so subsequent refining treatment is required, so the processing cost is relatively high