A system and method for producing a de-light hydrocarbon system from a sulfuric acid alkylation oil

CN122168329APending Publication Date: 2026-06-09CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing sulfuric acid process alkylation oil production systems, light hydrocarbon components below C4 are not removed in a timely manner, which affects the alkylation reaction efficiency, increases the power consumption of the refrigeration system, and increases investment and energy consumption in the deacidification facilities.

Method used

Without adding deacidification facilities, a combined system of alkylation reactor, reaction product flash tank, isobutane removal tower and light hydrocarbon removal tower is used. The gaseous light hydrocarbons enter the refrigeration cycle system, and the liquid products enter the isobutane removal tower and light hydrocarbon removal tower after deacidification to separate isobutane and light hydrocarbons, thereby optimizing reaction conditions and reducing energy consumption.

Benefits of technology

It achieves effective removal of light hydrocarbons below C4, recovers isobutane feedstock, stabilizes the reaction system, and reduces energy consumption and equipment investment.

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Abstract

This invention discloses a system and method for removing light hydrocarbons in the production of alkylate oil using the sulfuric acid process, relating to the field of sulfuric acid process alkylate oil production technology. The system for removing light hydrocarbons in the sulfuric acid process alkylate oil production of this invention includes: an alkylation reactor, a flash evaporator for the reaction products, a deacidification system for the reaction products, a deisobutane removal tower, and a light hydrocarbon removal tower. The top outlet of the deisobutane removal tower is connected to a cooler, and the cooler outlet pipeline is divided into three branches: one branch returns to the upper part of the deisobutane removal tower; one branch merges with the outlet pipeline of the light hydrocarbon removal tower and connects to the outlet pipeline of the alkylation reactor; and one branch connects to the middle part of the light hydrocarbon removal tower. This invention can remove light hydrocarbons below C4 from the reaction system and produce liquefied petroleum gas (LPG) without adding deacidification facilities, reducing the unit's energy consumption by more than 8 kg EO / t alkylate oil.
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