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Full-temperature-range adsorption, extraction and separation method capable of recovering H2 and C<2+> from refinery plant dry gas

A refinery dry gas, full temperature process technology, applied in extraction purification/separation, adsorption purification/separation, hydrocarbon purification/separation, etc. It can solve the problems of long process, inability to solve, and inability to completely solve the inherent bottleneck of separation technology. , to achieve the effect of reducing energy consumption, large dissolving capacity, and solving the problem of easy adsorption and difficult desorption

Active Publication Date: 2018-03-09
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these invention patents still have some deficiencies. For example, the process is long and cannot completely solve the inherent bottlenecks of their respective separation technologies—in the process of recovering C2+ by the coupled method, whether it is cold oil absorption or PSA concentration, each separation process has absorption - Desorption or adsorption-desorption cyclic operation process, which cannot solve the core problem that the more complete the absorption or adsorption, the more difficult the desorption is

Method used

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  • Full-temperature-range adsorption, extraction and separation method capable of recovering H2 and C&lt;2+&gt; from refinery plant dry gas
  • Full-temperature-range adsorption, extraction and separation method capable of recovering H2 and C&lt;2+&gt; from refinery plant dry gas
  • Full-temperature-range adsorption, extraction and separation method capable of recovering H2 and C&lt;2+&gt; from refinery plant dry gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 1 As shown, a full-temperature adsorption extraction separation method for recovery of H2 and C2+ from refinery dry gas includes the following procedures:

[0044] (1) C2+ adsorption concentration process, temperature is 50~60℃, pressure is 3.0~4.0MPa, H2 content is 35% (V / V, the same below), C2+ content is 16%, methane is 38%, other inert components The 11% refinery dry gas directly enters the C2+ adsorption and concentration system through the intake pipe without cooling or pressurization, and adopts a 2-tower parallel process at an operating temperature of 50~60°C and an operating pressure of 3.0~4.0MPa. Adsorption, one adsorption tower performs medium-temperature and medium-pressure adsorption, the other adsorption tower performs isothermal and isobaric C2+ extraction and desorption, and the two adsorption towers alternately perform isothermal and isobaric adsorption-extraction-desorption cycle operations to ensure continuous dry gas in the refinery Ent...

Embodiment 2

[0054] On the basis of the full-temperature adsorption-extraction separation method for recovering H2 and C2+ from refinery dry gas described in Example 1, it is further optimized. Before entering the C2+ adsorption and concentration process, it is necessary to add a purifying pretreatment device for acid gas removal . In this example, the refinery dry gas contains 1-5% CO2, 1-2% H2O and 0.1% H2S, and the C2+ components, temperature and pressure in the feed gas remain unchanged. Before the raw material gas enters the C2+ adsorption and concentration process, add a set of desulfurization and decarbonization device of alcohol amine absorption method and temperature swing adsorption (TSA) dehydration and drying device, so that CO2 in the raw gas of refinery dry gas≤0.01~0.1%, H2S≤ 10ppm, H2O≤0.01%. Refinery dry gas after removing acid gas and drying and dehydration, as raw material gas, directly enters the C2+ adsorption and concentration process to separate and extract H2 and C...

Embodiment 3

[0056]On the basis of a full-temperature adsorption extraction separation method for recovering H2 and C2+ from refinery dry gas described in Example 1, further optimization is carried out. The composition of the raw material gas remains unchanged, the temperature is 90-120 ° C, and the pressure is 0.5 At ~1.5MPa, it directly enters the C2+ adsorption and concentration process, and the adsorption is carried out in a system consisting of operating temperature 90~120°C, adsorption pressure 0.5~1.5MPa, and 2 adsorption towers, one of which absorbs and the other extracts For desorption, the two adsorption towers are alternately cycled to ensure continuous operation. In the C2+ extraction and desorption process, the critical C4 mixed alkanes at 90~120°C and 4.0~5.0MPa are used as the extraction agent to perform critical extraction and dissolution of the adsorbate C2+ adsorbed on the adsorbent, so that the C2+ in the extraction and desorption gas is mixed. The concentration of compo...

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Abstract

The invention discloses a full-temperature-range adsorption, extraction and separation method capable of recovering H2 and C<2+> from refinery plant dry gas. The method comprises the processes of performing adsorption and concentration on the C<2+>, performing extraction and desorption on the C<2+>, performing separation and recovery on the C<2+>, performing PSA separation and purification on thehydrogen (H2) and the like; the refinery plant dry gas passes through the C<2+> concentration and adsorption process, and most of C<2+> hydrocarbon components are adsorbed by an adsorption and concentration tower; H2-enriched gas flowing out of the top of the tower enters the process of performing PSA separation and purification on the H2 to obtain the H2 product with the purity of 98 to 99 percent; and the desorption gas is pressurized and returns to the C<2+> adsorption and concentration process to further recover the H2 and the C<2+>. After the adsorption step is completed, the effective component C<2+> is dissolved out by the C<2+> extraction and desorption process, the extraction and desorption gas enters the C<2+> separation and recovery process, the non-condensable gas H2 escapes, and the H2 and the H2-enriched gas are mixed to enter the process of performing PSA separation and purification on the H2; an extracting agent escapes, is regenerated, recovered and processed and thenis recycled; and the adsorption-extraction and desorption process is adopted, so the energy consumption investment is saved, the flow is shorter, the efficiency is higher, the service life of the adsorbent is longer and full-component recovery can be realized.

Description

technical field [0001] The invention belongs to the technical field of separation and recovery of refinery dry gas, and more specifically relates to a full-temperature adsorption, extraction and separation method for simultaneously recovering hydrogen (H2) and carbon 2 and above components (C2+) from refinery dry gas. Background technique [0002] With the increasing shortage of oil resources, inferior quality and increasingly stringent environmental regulations, the world's petrochemical industry is facing new challenges, and the comprehensive utilization of resources has received unprecedented attention. Refinery dry gas mainly comes from the primary and secondary processing of crude oil, such as crude oil distillation, catalytic reforming, catalytic cracking, hydrocracking, hydrofining, delayed coking, thermal cracking and other processes. Refinery dry gas is a mixed gas rich in H2, methane (CH4), C2+ light hydrocarbons (ethylene, ethane, propylene, propane, n-butene, iso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/10C07C7/12C07C11/04C07C11/06C07C9/06C07C9/08C01B3/50
CPCC01B3/50C01B2203/043C01B2203/048C07C7/00C07C7/005C07C7/10C07C7/12C07C11/04C07C11/06C07C9/06C07C9/08Y02P20/54
Inventor 钟雨明蔡跃明陈运刘开莉
Owner SICHUAN TECHAIRS
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