Combined process for preparing propylene from liquefied gas and preparing petroleum from dry gas
A combined process and liquefied gas technology, which is applied in the processing of gas mixtures, petroleum industry, hydrocarbon cracking and hydrocarbon production, etc., can solve the problems of large investment, high energy consumption of the system, and organic integration without consideration, and achieve the goal of reducing the amount of replenishment Effect
Active Publication Date: 2014-12-10
SHANGHAI HOTO PETROCHEM ENG
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[0025] This example is a 200,000 ton / year liquefied gas to propylene plant built in a refinery. The raw material is self-produced liquefied gas, and the dry gas of the dry gas to gasoline unit comes from the by-product dry gas of the liquefied gas to propylene unit.
[0026] The process used is as figure 2 As shown, the process includes the following steps: the cooled and compressed liquefied gas to propylene reaction effluent 1 enters the carbon three absorption tower A, the dry gas 2 at the top of the absorption tower enters the dry gas to gasoline unit B, and sends to the dry gas to gasoline unit Supplementary absorbent 3 is added to B, and the absorbed gasoline 4 is returned to the carbon three absorption tower A, and the absorbed fraction 6 of the bottom of the carbon three absorption tower A enters the subsequent desorption and stabilization part. The tail gas 5 produced by the dry gas to gasoline unit B can be directly sent out of the boundary area or partly returned t...
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The invention relates to a combined process for preparing propylene from a liquefied gas and preparing petroleum from a dry gas. The combined process comprises the following steps of: feeding cooled and compressed liquefied gas to propylene reaction effluent into a C3 absorption tower; feeding dry gas on the top of the absorption tower into a dry gas to petroleum unit; absorbing petroleum produced by the dry gas to petroleum unit with a replenished absorbent; returning the absorbed petroleum serving as an absorbent of the C3 absorption tower into the C3 absorption tower; and feeding a tower kettle fraction of the C3 absorption tower into a subsequent desorption and stabilization part. Compared with the prior art, the combined process has the advantages that: a petroleum component produced by the dry gas to petroleum unit is recycled, so that the replenishing amount of the replenished absorbent used in the combined process is reduced, the circulation of the absorbent used in the desorption and stabilization part of a liquefied gas to propylene unit is reduced simultaneously, and the aims of reducing device operating cost and lowering energy consumption are fulfilled. The combined process is a combined production process, which can be used for transforming the liquefied gas and / or dry gas of a refinery into a propylene product and the petroleum component and has low operating cost and low energy consumption.
Description
technical field [0001] The invention relates to the field of liquefied gas processing and comprehensive utilization of dry gas, in particular to a combined process for producing propylene from liquefied gas and gasoline from dry gas. Background technique [0002] In recent years, with the rapid improvement of my country's crude oil processing capacity and the continuous increase of ethylene production, C4 resources as petrochemical by-products are also expanding. In 2006, my country's ethylene production was 9.249Mt, crude oil processing volume was 307Mt, and C4 distillate production has reached More than 20Mt, in addition to the utilization of butadiene and isobutene, about 8Mt of carbon tetraolefins are used as liquefied gas fuel. Therefore, how to fully and rationally utilize C4 resources, explore the potential value of C4 products, and improve the economic benefits of enterprises has become the focus of attention. [0003] Propylene is an important petrochemical raw mate...
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IPC IPC(8): C07C11/06C07C4/02C10G70/00C10G50/00
Inventor 李立新张韩陈首创张明会袁萍
Owner SHANGHAI HOTO PETROCHEM ENG